Abstract
Keywords
Introduction
As China’s economy has developed and living conditions in rural areas have improved, the amount of rural domestic wastewater discharge has increased dramatically, posing a serious threat to ecological balance in rural areas (Mu et al., 2023). According to a survey by the Ministry of Ecology and Environment of China, rural wastewater accounted for 40% of the total wastewater in China in 2020 (Jin, 2021). In fact, only 25% to 30% of rural domestic sewage in China has been effectively treated, and only a few villages have sewage discharge pipelines or sewage treatment facilities (Y. Xu et al., 2022). The reasons behind this phenomenon are complex and varied, including but not limited to the fact that villagers lack sufficient awareness of the environmental and health risks associated with the indiscriminate discharge of wastewater, leading them to ignore the importance of wastewater treatment in their daily lives (Tang et al., 2023). Additionally, due to economic constraints, some households may not be able to afford the cost of constructing and maintaining sewage treatment facilities, meaning that even if they are aware of the necessity of sewage treatment, they find it difficult to put it into practice (Werkneh & Gebru, 2023; Werkneh, 2024). In addition, the lack of effective environmental education in rural areas has created barriers to the promotion and application of clean treatment technologies (Huang et al., 2023). Rural residents usually discharge domestic sewage directly into nearby rivers and lakes, which negatively affects the environment and human health and restricts sustainable rural development (Berendes et al., 2017; Duong et al., 2014; Oyekale, 2013). Therefore, rural domestic wastewater treatment has become an urgent problem.
To improve the rural environment, water quality and the quality of life of rural residents, the Chinese government has taken direct measures such as establishing sewage treatment stations and formulating village rules and regulations (Ai et al., 2020; Bo & Wen, 2022; Qi-yu et al., 2021). However, some scholars argue that the lack of environmental awareness among villagers has led to slow progress in domestic wastewater treatment projects. Therefore, increasing the effective participation of rural residents in wastewater treatment is key to the success of rural wastewater treatment projects (Ding et al., 2021). At present, rural domestic sewage treatment still faces problems such as insufficient investment in environmental protection infrastructure, imperfect management and protection mechanisms, imperfect participation methods for farmers, and low levels of rural domestic sewage treatment (Y. Li & Song, 2020; Song et al., 2020). To solve environmental problems, farmers' participation is necessary (R. Zhang et al., 2020).
Numerous studies have been conducted on how to involve villagers in rural wastewater treatment. Resource endowment plays a crucial role in farmers’ decisions (J. Liu & Zhou et al., 2024; Xie et al., 2021; Xiang & Lu, 2023; X. Xu et al., 2023; R. Zhang et al., 2020), as farmers’ participation in treatment programs mainly depends on their household capital stock (Mendola, 2008). Farmers’ household endowment, that is, all the resources and capabilities that the whole household possesses, includes three major categories: economic, social, and human capital endowment. Economic capital refers to the household’s income and wealth; social capital involves the social network and mutual cooperation within the community; and human capital includes their level of education, health, and professional skills (Yu et al., 2023).
In addition, village cadres are an important part of village governance and have a great impact on village development. Trust is the foundation of cooperation, and the credibility of village cadres is a manifestation of political trust (Chanley et al., 2000; Job, 2005). Studies have found that a close relationship between village cadres and the people they govern significantly enhances disciplinary monitoring and transmits internalization effects, and that grassroots leaders who have gained the political trust of farmers are more likely to organize and mobilize villagers to participate in village public affairs (Hao et al., 2022; Xue et al., 2021; M. Zhang et al., 2023).
Although sewage treatment is a topic of scholarly interest, little attention has been paid to the relationship between household endowments and household sewage treatment methods. Most of the existing studies explore the influencing factors of farmers’ participation in domestic sewage treatment, but there is room for further expansion in the following two areas. First, although some scholars have explored the impacts of farmers’ participation in rural human settlements governance, such as domestic sewage treatment or domestic waste treatment, from the perspectives of economic capital, human capital, social networks or environmental awareness alone, scholars have not integrated these dimensions into the same household endowment research framework. Second, few studies have considered the possible moderating role of village cadre credibility between the two. In addition, few studies have considered both household endowment and village cadre credibility. Accordingly, this study intends to explore the following questions: How do household endowments affect rural residents’ behavior and decision-making regarding wastewater treatment? What is the role of village cadre credibility? Does the effect of household endowment on rural households’ domestic wastewater treatment vary by age and region?
Our research makes three key contributions to the study of rural domestic sewage treatment. First, this paper uses field survey data to measure rural household endowments and study the impact of these endowments on the choice of clean sewage treatment methods, providing a new perspective for understanding the relationship between household endowments and sewage treatment decisions. Second, this paper explores the moderating role of village cadres’ credibility, providing new empirical evidence for understanding the relationship between household endowments and farmers’ use of clean sewage treatment methods. Third, the paper discusses the effects of heterogeneity on different age groups and amounts of non-agricultural work experience, as well as at different regional levels. These factors contribute to the implementation of rural domestic wastewater treatment policies across households. This study investigates the relationship between farm household endowments and sewage treatment practices and further explores the role of village cadre credibility in this context. In order to explain the relationship between village cadre credibility and farmers’ domestic sewage treatment decisions, this study also analyzes the moderating effect involved. Through empirical analysis, this study reveals the ways that household endowment influences clean rural domestic sewage treatment, and provides a scientific basis for the formulation of rural sewage treatment policies that promote the adoption and application of clean sewage treatment technologies by increasing household endowment.
Theoretical Framework and Hypotheses
Farmers’ participation in the treatment of domestic sewage is a complex decision-making process, which is not solely based on individual preferences and experiences. As an embedded resource that includes economic, social, and human capital, household endowment plays a role in farmers’ choice of domestic sewage treatment.
Relationship Between Household Endowment and Domestic Wastewater Treatment Behavior of Farm Households
Farm households’ participation in the construction and management of clean sewage treatment facilities is influenced by many factors. This study examines the impact of household endowment on clean rural sewage treatment based on economic, social, and human capital. Resource endowment theory assumes that the resource holdings of an individual or household affect their behavior and decision-making. In this hypothesis, economic capital is viewed as the financial and physical resources available to households to invest in clean sewage treatment facilities. Specifically, households with higher economic capital are more likely to invest in clean wastewater treatment technologies because they are able to afford the associated costs and expect long-term gains in their quality of life (Ju et al., 2022). Previous studies have shown that capital investment is the prerequisite for farmers to manage domestic sewage treatment facilities (Shan et al., 2021). Therefore, when deciding whether to use clean sewage treatment methods, farmers consider the financial cost of constructing and maintaining clean sewage facilities. As household income increases, residents have higher expectations for their living environment, and will pay more attention to the issue of domestic sewage pollution and regulate their own domestic sewage behavior. Farmers with greater economic capital are more likely to invest in wastewater treatment facilities, thereby improving the efficiency and quality of domestic wastewater treatment.
Social capital theory emphasizes the important role of social networks and community participation in promoting clean wastewater practices, and increasing the effective participation of rural residents is key to rural wastewater treatment (Ding et al., 2021). Social capital is a network of relationships embedded in individuals, as well as a productive resource that can facilitate individual behaviors (Coleman, 1990). Anderson and Schirmer (2015) found that social capital promotes public participation in low-carbon actions. Putnam (1993) believed that social capital influences farmers’ behavior through social trust, norms, and relationship networks, thereby increasing farmers’ demand for and adoption of clean sewage treatment methods. Rural China is a typical “acquaintance society” that is linked by blood and kinship (Du et al., 2016). Sewage treatment facilities are public goods, and the soft coercive mechanism formed by the trust and reputation established in informal relationship networks reduces farmers’“free rider” mentality (Putnam, 1993). As a result, community members living within the same sphere of influence form a community of interest for mutual benefit and cooperation. In communities with strong social capital, farmers are able to share resources and knowledge more effectively by cooperating with each other and exchanging information to promote the implementation and maintenance of clean wastewater treatment technologies (R. Zhang et al., 2020).
Human capital theory, on the other hand, focuses on the impact of education and health on improving farmers’ awareness and ability to use wastewater treatment technologies (J. Liu & Zhou et al., 2024). Human capital development requires health, education, and professional training and improves the economic capacity of families or individuals (Mihalache, 2019). Rural households with higher per capita education more fully recognize the importance of regulating sewage discharge behavior, and have a more comprehensive understanding of sewage treatment policies, so they are more inclined to use clean sewage treatment methods. Mushkin (1962) emphasized that health is an important component of human capital formation. Increasing human capital in rural households helps ensure a better family economic situation, giving these families more funds to invest in sewage construction. Increased education levels enable rural households to better understand the importance of wastewater treatment and related policies, while good health allows farmers to participate in wastewater treatment practices. Thus, increased human capital helps farmers to adopt and maintain clean sewage treatment practices more effectively.
In summary, the three dimensions of household endowment: economic capital, social capital, and human capital, complement each other and contribute to the cleaner treatment of rural domestic wastewater. That is, increased household endowment contributes to the likelihood of rural households adopting clean sewage treatment methods. As a result, the following research hypotheses have been formulated:
Moderating Effect: Indirect Impact of Village Cadre Credibility
Previous studies have confirmed that farmers’ resource endowment has a positive impact on their behavior (Y. Cheng et al., 2022), but these studies lack an in-depth exploration of the relationship between the two. According to the trust-cooperation theory, cooperation is more stable when farmers’ trust in the government is high, which suggests that good relations between the cadres can not only encourage farmers’ participation, but also lead to a better understanding and awareness of the institutional rules, thus increasing their willingness to participate in rural governance (Cao et al., 2020; Kumar & Saha, 2017). G. R. Yang et al. (2023) noted that places with low levels of trust are prone to policy target group mismatch. Village cadres play a crucial role in managing village affairs and assisting the government in performing its official duties; they are not only agents of the government but also stewards of farmers (Wu, 2002). Existing studies have shown that village cadre credibility increases the level of trust that farmers have in village cadres and that this trust is an important factor in promoting collective action (J. Liu et al., 2022). The better the relationship between villagers and village cadres, the higher the frequency of socialization among them, which increases the frequency of supervision issued by village cadres and the normative pressure released by them, strengthening the role of the village cadre (Hao et al., 2022; Ju et al., 2022). Greater affective trust between village cadres and the villagers that they lead may make those villagers more willing to comply with and cooperate with the cadres, reducing the likelihood of discharging domestic sewage indiscriminately (R. Zhang et al., 2020). Therefore, this paper proposes the following research hypothesis:
The theoretical analysis framework of this paper is shown in Figure 1.

Theoretical analysis framework.
Materials and Methods
Data
The data in this paper come from the 2022 Liaoning Rural Revitalization Tracking Survey (LRVLS), a large-scale sample survey of farm households organized and implemented by the School of Economics and Management of Shenyang Agricultural University in Liaoning Province. Rural areas in Liaoning Province include different geographic regions such as the coast, central plains, eastern mountains, and hilly and mountainous areas in northwestern Liaoning, and the level of economic development, climatic conditions, and living habits in these regions vary significantly, affecting the construction and operation of wastewater treatment facilities and leading to different needs and practices of domestic wastewater treatment. Therefore, this paper researches rural residents in Liaoning Province to explore the impact of household endowment on rural domestic wastewater treatment.
Before conducting the formal survey, a pre-survey was conducted to test the reliability and validity of the questionnaire and necessary adjustments were made to the questionnaire based on the results of the pilot survey. The formal survey was conducted using a stratified random sampling method—Probability Proportional Sampling (PPS) study. Sampling followed standard practices. The specific process is as follows: (a) Determine the sample counties (districts and cities). The counties were then categorized into three categories of high, medium, and low based on their 2020 GDP per capita. Four counties were randomly selected from each category. (b) The same stratified random sampling method was then used to identify three sample towns in each sample county, totaling 36 towns. (c) Using the random sampling method, 106 villages were selected from the sample townships. (d) 1,164 households were randomly selected from the 106 villages.
After excluding inconsistencies and questionnaires with missing data, a total of 106 village questionnaires and 1,081 farm household questionnaires were obtained, of which the efficiency of the village questionnaires was 100% and the farm household questionnaires was 92.9%. Questions directly related to this study are added as supplementary material in the Appendix section (see Appendix: Questionnaire). The village questionnaire collected data on infrastructure and sanitation rules, while the household questionnaire focused on household size, household income and living conditions, as well as the characteristics and demographics of the respondents. There may be significant differences in socio-economic characteristics such as income level, employment status and family structure among different age groups, which may influence their access to rural domestic wastewater treatment technologies and resources. Therefore, drawing on Sayujya and Navyashree’s (2021) study, we categorized the participants into the following age groups: 30 years old and below, 31 to 40 years, 41 to 50 years, 51 to 60 years, and 60 years old and above. Such a division helps us to analyze the differences in domestic wastewater treatment technology adoption among different age groups.
Variable Selection
(1) Economic capital refers to material wealth. This has a direct impact on the ability of households to invest in clean sewage treatment technologies and facilities. Households with more economic capital are more capable of purchasing and maintaining wastewater treatment equipment and thus treating domestic wastewater more efficiently (Ju et al., 2022). Drawing on Yu et al.’s (2023) study, we use annual household income as a proxy indicator of economic capital. This indicator is widely recognized as a direct and valid way of capturing the economic status of a household. Since data on annual household income often span several orders of magnitude, ranging from a few thousand to millions, taking logarithms can help to narrow down and focus the data, making it easier to analyze and interpret. For this reason, this paper uses the logarithm of annual household income to measure household economic capital.
(2) Social capital refers to the resources obtained by family members as members of an organization and involves social networks and mutual cooperation within the organization. Strong social capital improves the efficiency of wastewater treatment by organizing and mobilizing community members to participate in the construction and maintenance of wastewater treatment projects (Ding et al., 2021). Community participation and cooperation facilitates the sharing of knowledge and technology and increases awareness of the importance of wastewater treatment. Drawing on R. Zhang et al. (2020) and Yu et al. (2023), we selected the presence of village cadres in rural households and the number of people members of the household can borrow money from when in urgent need to calculate average social capital.
(3) Human capital includes education and health, factors that influence an individual’s knowledge and ability to operate clean sewage treatment technologies. Farmers with higher levels of education are more likely to understand the importance of wastewater treatment and be more willing to adopt effective wastewater treatment methods (J. Liu & Zhou et al., 2024). In addition, good health also contributes to farmers’ participation in wastewater treatment-related labor and maintenance. Drawing on the studies of Eftimoski (2022) and X. Xu et al. (2023), this paper uses two factors, per capita educational attainment of household members and average health status, to measure human capital, and derives a human capital score by calculating the average of the two.
Individual characteristics include gender, age, marital status, whether the respondent is a party member, and whether he or she is engaged in non-agricultural work. Age is an important factor affecting farmers’ participation in domestic sewage treatment (Lam et al., 2015). Individuals lose strength as they age, and their living habits tend to stabilize, which is not conducive to participating in domestic sewage treatment. Meanwhile, existing literature also confirms that non-agricultural work has a positive impact on the participation of farmers in rural domestic sewage treatment (Ju et al., 2022). Rural residents engaged in non-agricultural work are usually more willing to accept new knowledge and technologies.
Household characteristics include household size, if the family is poor, the source of domestic water, and whether the road leading to the household is accessible by car. Existing literature has shown that family size is an important factor affecting behavior (D. Zhang et al., 2020). A number of studies also reveal that the source of domestic water is an important factor (Tan et al., 2011), because it is a representation of farmers’ current water resource utilization, which has a direct impact on their behavior. Sewage treatment infrastructure accessibility has been found to be an important factor influencing rural household sewage treatment behavior (C. Zhang et al., 2023). The main difficulty with rural wastewater treatment is the slow construction of wastewater treatment facilities and the low throughput of the facilities. Road accessibility directly affects the ease with which households can use these facilities, which influences their choice of sewage treatment (Hidalgo et al., 2018).
Village characteristics include the availability of domestic sewage treatment projects, the availability of public sewage networks, and the existence of village rules and regulations on sanitation. The availability of sewage services at the village level is an important factor influencing household sewage treatment choices, and the implementation of sewage treatment projects can help to effectively manage sewage discharge patterns across broad areas (Estévez Rivadulla et al., 2022; Wei et al., 2020). Specifically, the availability of domestic sewage treatment projects in villages significantly influences the likelihood of households adopting cleaner treatment options (Bo & Wen, 2022). In addition, the ability of households to connect to the public sewage network has been confirmed by several studies as a key factor for clean treatment practices (Huang et al., 2021; Sood et al., 2023). Relevant studies have also shown that village rules and regulations give farmers a sense of collective responsibility and ownership (F. Yang et al., 2020).
Definitions of variables and descriptive statistics are shown in Table 1. It can be seen from the statistics that 48.7% of the sample was male and 51.3% was female, with the ratio of men to women being close to the same proportion, implying that the research is a representative gender distribution. Most respondents were middle-aged, which reflects the phenomenon of young people leaving rural areas to work. Married people accounted for 84.8% of the sample. Party members accounted for only 15.8% of the sample, while non-party members accounted for 84.2%. Those engaged in non-agricultural work made up 18.1% of the respondents, indicating that the majority of the respondents were not engaged in non-agricultural work. In terms of household characteristics, the mean household size was 2.853 persons, meaning that respondents generally had smaller households. Poor households accounted for 7.1% of the sample, indicating that the majority of respondents' households were economically well off. 63.3% of households used piped water, while the other 36.7% used well water. 93.9% of households had access to a vehicle, but only 15.4% of the villages sampled had sewage treatment programs, while an even smaller 3.3% of villages had public sewage networks. The low penetration of sewage treatment facilities and public sewage networks may be related to the level of local economic development, environmental awareness of the residents, and government investment and planning, meaning that more policy support and financial investment may be needed to improve sewage treatment facilities. 48.1% of villages had sanitation rules and regulations, indicating solid coverage with ample room for improvement. Respondents had high levels of trust in village cadres, giving them a credibility score of 9.085 out of 10.
Summary Statistics.
Analysis Model
A Logit Regression was conducted to analyze the impact of household endowment on respondents’ household sewage treatment. The specific model is:
In Formula (1),
Results
Regression Analysis
Table 2 reports the marginal effects of the explanatory variables based on the estimated parameters of the Logit model. On the basis of model (1), individual, household and village characteristic are successively added to models (2) to (4), and regional fixed effects are added to model (5).
Baseline Regression Results.
As shown in column (5) of Table 2, the marginal coefficient of household economic capital is 0.093, which is statistically significant at the 1% level, indicating that for every 1% change in the economic capital of a rural household, the probability of a farmer using a clean sewage treatment method increases by 9.3 percentage points. This result indicates that increase in household economic capital promotes clean sewage treatment methods by rural households. This is consistent with the findings of Yu et al. (2023). Possible explanations include that farmers with higher income have a clearer understanding of domestic sewage treatment methods (Ye, 2012), since they know that casual discharge of sewage is detrimental to the health of their family members and negatively affects their income, so they prefer to use clean sewage treatment methods. Farmers with higher incomes also have a greater ability to pay for sewage treatment.
The regression coefficient for social capital is positive and statistically significant at the 1% level. These findings suggest that increased social capital encourages rural households to choose clean sewage treatment methods. This is consistent with the findings of Anderson and Schirmer (2015) that social capital promotes public participation in low-carbon initiatives, and that in communities with strong social capital, farm households are able to share resources and knowledge more effectively by cooperating with each other and exchanging information about the implementation and maintenance of clean wastewater treatment technologies (R. Zhang et al., 2020). One possible reason for this is that the construction of clean sewage treatment facilities requires a large amount of material and financial resources, and rural households with close-knit neighborhoods have stronger social networks and are more likely to be able to address the investment required for the construction of clean sewage treatment facilities. At the same time, if there are village cadres among the family members, the family’s network of contacts will be wider, and the information about sewage treatment obtained will be more timely, accurate, and comprehensive. As a result, the probability of using clean sewage treatment methods will be higher.
The marginal coefficient of human capital is 0.118, which is statistically significant at the 10% level, indicating that each 1% change in the accumulation of human capital in rural households increases the probability of farmers using clean sewage treatment methods by 11.8 percentage points. The result of the study suggests that increase in human capital encourages clean sewage treatment among rural households. This is consistent with the studies of Eftimoski (2022) and X. Xu et al. (2023). A possible explanation for this phenomenon is that more educated and physically fit farmers will have more off-farm employment opportunities, and therefore have greater ability to participate in rural domestic sewage treatment. Meanwhile, rural residents with higher human capital have a clearer understanding of things and are more willing to accept new technologies, and therefore, have a broader vision in making decisions about domestic sewage treatment methods. In summary, the three dimensions of H1 household endowment (economic, social, and human capital) have a positive impact on the use of clean sewage treatment methods by rural households.
Endogeneity Treatment
In order to avoid endogeneity problems that can arise from omitted variables and bidirectional causality between household endowments and farmers’ household use of clean sewage treatment, the model also needs to be tested for endogeneity. Drawing on Meng et al. (2024), Godoy et al. (2007), and Pokropek (2016), this study uses the level of mechanization at the village level, the level of social capital of other farmers in the same village, and the level of human capital of other farmers in the same village as instrumental variables for economic, social, and human capital. Table 3 reports the results of the two-stage least squares (2SLS) regression on the effect of household endowment on the use of clean sewage treatment by farmers.
Estimation Results Based on 2SLS.
This study refers to Shair et al.’s (2024) endogeneity test. The first stage model uses economic capital, social capital and human capital as the dependent variables, and the level of mechanization at the village level, the level of social capital of other farmers in the same village and the level of human capital of other farmers in the same village as independent variables; the second stage model uses the use of clean sewage treatment or not as the dependent variable, and economic capital, social capital and human capital, as predicted in the first stage, are used as the independent variables. The estimation results of the first stage show that the coefficients of the level of mechanization at the village level, the level of social capital of other farmers in the same village, and the level of human capital of other farmers in the same village are all significant at the 1% level. This result indicates that the level of village-level mechanization, the level of social capital of other farm households in the same village and the level of human capital of other farmers in the village are highly correlated with household economic, social, and human capital. The
Robustness Check
Replacing core variables is a common practice for robustness testing. After standardizing the indicators of various dimensions of household endowment, this article uses the average weight method to calculate the average value of each dimension indicator, and forms a comprehensive indicator value of household endowment. Then the comprehensive indicator value is used to perform regression estimation of Logit model for the dependent variable. The results in Table 4 show that the household endowment coefficients are significantly positively correlated with the use of clean sewage treatment methods by rural households at the 1% level, and the regression results are consistent with the baseline regression results.
Robustness Tests.
The Moderating Effect of Village Cadres’ Credibility
The results (Table 5) show the moderating role of village cadres’ credibility between household endowments and farmers’ use of clean sewage treatment methods.
Results of the Moderating Effect of Village Cadre Credibility.
It can be seen that the interaction coefficients between each dimension of family endowment and the credibility of village cadres are positive and significant at the 10%, 1%, and 1% levels, respectively. This implies that the positive impact of household endowment (including economic, social and human capital) on farmers’ adoption of clean sewage treatment methods is enhanced when village cadres are perceived to be more credible and reliable. This could be because, in terms of economic capital, rural households with better incomes are more willing to spend money on the construction, maintenance and management of clean sewage treatment facilities due to their trust in village cadres (Ju et al., 2022). Village cadres, as leaders and liaisons in the community, can facilitate information flow and community collaboration to increase participation in wastewater treatment (Ding et al., 2021). Village cadre credibility can strengthen social capital, discourage free-riding and opportunistic behavior, and promote the use of clean wastewater treatment methods. In terms of human capital, village cadres can improve the environmental awareness and wastewater treatment skills of rural households through education and training programs. In addition, village cadres serve as role models to demonstrate the importance of clean sewage treatment through their own behavior (J. Liu & Qi et al., 2024). The more farmers trust village cadres, the more willing they are to cooperate with related policies (Cao et al., 2020). Those with higher levels of education are able to establish effective communication with village cadres and are more willing to accept the suggestions and actions of village cadres. Therefore, H2 Village cadres’ credibility is confirmed to play a moderating role in the effect of household endowment on rural domestic wastewater treatment.
Heterogeneity Analysis
The impact of household endowments on farmers’ participation in rural domestic sewage treatment may vary depending on their non-agricultural work experience (Wang et al., 2022; W. Zhang et al., 2017). In this paper, grouped regression is performed based on non-agricultural work experience (see Table 6). Economic capital has a more significant impact on farmers with non-agricultural work experience than those without. One possible reason for this is the increased environmental literacy and investment capacity of environmental governance brought about by non-agricultural income (Jiang et al., 2019). Farmers without non-agricultural work experience do not have sufficient economic capital to participate in village-level public affairs, and their understanding of rural domestic sewage treatment is weak. Therefore, social capital has a greater impact on farmers without non-agricultural work experience. This difference may be because when the household population engages in non-agricultural work, their sense of belonging and dependence on the village is greatly reduced, resulting in lower expected benefits and higher psychological costs of sewage treatment, thereby reducing participation in rural domestic sewage treatment (Shi et al., 2011). For farmers who have lived in the village their whole lives, it is easier to obtain relevant information about sewage treatment and establish good relationships with their neighbors, increasing the likelihood that they use clean sewage treatment methods. Therefore, it can be seen that there is no significant difference in sewage treatment methods between farmers with different levels of human capital.
Heterogeneity Analysis Results.
In addition, farmers of different ages have different resource endowments (Bellin et al., 2019). Firstly, compared with farmers under 60 years old, economic capital has a greater significant positive impact on the use of clean sewage treatment methods by farmers over 60 years old. A possible explanation is that the construction of sewage treatment facilities requires money and time. Farmers over 60 years old have more free time, work experience, and accumulated wealth (X. Y. Li et al., 2022). Meanwhile, those under the age of 60, due to their involvement in non-agricultural work, depend less on their villages, resulting in less enthusiasm for rural domestic sewage treatment. Secondly, social capital has a more significant positive impact on the use of clean sewage treatment methods by farmers under 60 years old. This is perhaps because young farmers have a wider range of ways to learn domestic sewage treatment technology (Hu & Hu, 2016). Thirdly, human capital has a significant positive impact on farmers under the age of 60, possibly because young farmers are able to learn new concepts and new technologies. For elderly farmers, their knowledge of rural domestic sewage treatment is relatively outdated, and they are less willing to learn about new technology (P. Cheng et al., 2020).
Rural areas of Liaoning Province are distributed in different regions, including coastal, central plain, eastern mountainous areas, and hilly and mountainous areas in northwestern Liaoning Province. These areas have significant differences in their levels of economic development, climatic conditions, customs, and resource endowments, which influences the construction and operation of wastewater treatment facilities in these areas. Thus, regional heterogeneity may lead to different outcomes in terms of the effect of household endowment on the use of clean wastewater treatment practices by farm households. Therefore, this study categorizes the sample in Liaoning Province into three groups: Liaodong, Liaozhong, and Liaoxi to investigate the effect of regional heterogeneity on the use of clean sewage treatment by rural households.
From the results in Table 7, it can be seen that economic capital has a significant positive effect on farmers’ use of clean wastewater treatment in western and central Liaoning, suggesting that, in these areas, better-off farmers are more capable of investing in clean wastewater treatment facilities. However, in the Liaodong region, the effect of economic capital is not significant, possibly because the higher economic level of Liaodong region may mean that they already have wastewater treatment infrastructure, including public wastewater treatment plants and sewage pipe networks. The well-developed infrastructure may imply that the accessibility of clean sewage services is high and farmers do not need additional economic inputs to connect to these services. Therefore, economic capital is not a major factor in determining the adoption of clean sewage treatment in this region. In the Liaodong and Liaozhong regions, the effect of social capital on the use of clean wastewater treatment by farm households passed the 1% significance level test, indicating that farm households in Liaodong and Liaozhong have a high probability of using clean wastewater treatment through interpersonal networks of cooperation and reciprocity and sharing of resources. However, in Liaoxi, social capital has an inhibitory effect on the use of clean sewage treatment by farm households, which implies that there may be specific socio-cultural factors that inhibit this effect in the region. Human capital passed the significance positive test in the Liaodong and Liaoxi regions, possibly because rural residents in Liaodong and Liaoxi regions have higher levels of education, clearer understandings of rural domestic wastewater treatment, and anticipate that indiscriminate discharging of domestic wastewater will lead to pollution, which is detrimental to their family members’ health and leads to a decline in the quality of agricultural products, leading them to use clean wastewater treatment. Human capital, on the other hand, does not play a significant role in Liaozhong, which indicates that the relationship between education and health levels and the choice of sewage treatment method is weak in this region, or that more data are needed to verify this relationship.
Regional Heterogeneity Results.
Conclusions and Policy Recommendations
This study analyzes in depth the impact of household endowment on farmers’ adoption of clean sewage treatment methods based on field survey data from rural areas of Liaoning Province. The results show that there is a significant positive correlation between household economic, social and human capital and the use of clean sewage treatment methods, providing new empirical evidence for understanding the relationship between household endowments and farmers’ use of clean wastewater treatment methods. Second, this study examines the moderating role of village cadres’ credibility, an area that is under addressed in the existing literature. The study found that the credibility of village cadres played a positive moderating role in this relationship, which provides new perspectives on rural environmental governance and offers opportunities for future research. Third, this study’s analysis of heterogeneity across age groups, occupations, and regions further reveals differences in sewage treatment behavior across groups: economic capital has a more significant effect on the adoption of clean sewage treatment by farmers with non-agricultural work experience and those age 60 and older; social capital has a more prominent positive effect on farmers with only agricultural work experience and those under 60 years of age; and human capital had a more significant effect on farmers under 60 years old. Economic capital has a significant positive effect on farmers’ use of clean wastewater treatment in western and central Liaoning; social capital has a significant positive effect on farmers’ use of clean wastewater treatment in eastern and central Liaoning; and human capital has a significant positive effect on farmers’ use of clean wastewater treatment in eastern and western Liaoning. Our heterogeneity study provides an important reference for the effective implementation of rural domestic wastewater treatment policies in different households, as well as providing a theoretical basis and practical guidance for the government to formulate more targeted rural wastewater treatment policies.
First, in promoting rural domestic sewage treatment measures, attention should be paid to the relationship between household endowments and the use of clean sewage treatment methods. The government should emphasize the construction of clean sewage treatment facilities for low-income rural households and increase the economic endowment of these rural households through financial subsidies and technical assistance, thereby promoting the adoption of clean sewage treatment methods. It is also necessary to grow farmers’ social capital. Farmers should be actively involved in the planning, implementation and supervision of wastewater treatment projects to strengthen social ties among farmers and to enhance the collective efficiency of wastewater treatment. In addition, local educational resources can be used to carry out environmental awareness-raising and professional skills training programs and to broaden farmers’ access to information, so as to increase their awareness of the importance of wastewater treatment and to improve their capacity in the practical operation and maintenance of wastewater treatment facilities.
Second, in order to enhance the credibility of village cadres, village affairs should be publicized, so as to build trust between farmers and village cadres and ensure the fairness and transparency of the decision-making process by regularly announcing the progress of wastewater treatment projects, the use of funds, and the expected environmental and social benefits. Village officials should demonstrate the effectiveness of wastewater treatment, including by sharing specific data on water quality improvement, improved sanitation, and positive impacts on the local ecosystem. Farmer participation should be increased by organizing demonstration sessions and participatory assessment activities. In addition, a participatory decision-making process should be introduced to involve farmers in the planning and monitoring of the project to increase trust and improve project adaptability. Effective feedback mechanisms, such as village meetings and digital platforms, should be established to collect opinions and optimize strategies. Groups should also establish a recognition system to motivate farmers to actively participate and promote the dissemination of positive behaviors. Finally, non-farm employment opportunities for farmers should be encouraged to promote the widespread use of clean sewage treatment technologies. Rural environmental protection industries, such as eco-agriculture and renewable energy, should be developed to create non-farm employment opportunities that are closely aligned with environmental protection; vocational skills training should be implemented to help farmers build professional skills in environmental protection and wastewater treatment. These steps can raise farmers’ incomes and motivate them to adopt cleaner wastewater treatment technologies. Another potential method is establishing incentive mechanisms, such as technology subsidies and a recognition system, to increase farmers’ motivation to adopt cleaner technologies. In addition, environmental education can be improved by implementing differentiated education and training for farmers of different ages. For farmers under 60 years old, the focus should be on promoting new technologies and increasing environmental awareness, while for farmers over 60 years old, the focus should be on their life experience and traditional knowledge. It is also important to improve rural infrastructure to attract investment in non-agricultural industries. Finally, a cooperative mechanism involving the government, enterprises and farmers should be established to promote the widespread application of clean sewage treatment technologies and realize sustainable development of the rural economy and environment.
This study has several limitations. First, the data for this study were mainly from rural areas in Liaoning Province, which limits the generalizability of the findings. The socio-economic conditions, cultural backgrounds, and policy environments of different regions may have an impact on the findings, and therefore, research in a wider geographic area is needed to verify the generalizability of the findings. In the future, the sample can be extended to conduct comparative studies of rural households in different provinces and regions. Second, limitations of cross-sectional data. The data used in this paper are cross-sectional and lack temporal continuity, which limits in-depth understanding of the trends and dynamic processes of changes in rural sewage treatment behavior. In order to explore the relationship between household endowments and domestic wastewater treatment in greater depth, future research could collect data at multiple points in time by using longitudinal tracking or panel data methods.
