Systematic Analysis And Optimal Management Technology Research Of Rural Household Toilet Resource Utilization

The uneven socio-economic development in different rural regions of China has resulted in inadequate sanitation facilities and systems,particularly in some areas where the toilet hygiene facilities are still not well-equipped.It is urgent to find a comprehensive solution to improve the rural toilet fecal resource utilization system and meet the needs of sustainable management.This paper focuses on the analysis of the rural toilet fecal resource utilization system and optimization research of its management system.The main research conclusions obtained are as follows:Firstly,the association rule mining method was used to generate a dataset of the correlation between socio-economic development indicators and the penetration rate of harmless rural toilets.The results found a statistically significant correlation between socio-economic development indicators and the penetration rate of sanitary toilets in rural regions.Based on the 2017 penetration rates of sanitary toilets in China’s rural areas,an association rule graph was plotted and targeted differentiated measures were proposed to expedite the expansion of harmless sanitary toilets in rural areas of each province.Secondly,on-site household surveys were conducted with 665 villagers across 13 provinces in seven geographical regions of China.The findings revealed that 60.90%of respondents had not retrofitted their toilets,with the highest percentage from Northwestern China.38.46%cited policy subsidies as their main incentive.Of the respondents who had already retrofitted,24.51%expressed high satisfaction with their new toilets.Additionally,63.31%of the respondents reported some level of resource utilization of toilet feces,indicating that significant opportunities for further resource utilization of toilet feces still exist.Thirdly,the grounded theory method was used to analyze interview transcripts with farmers and uncover the drivers of rural residents’ participation in toilet retrofitting.A motivation model for rural residents to participate in toilet retrofitting was constructed,revealing the mechanism driving rural residents to participate in toilet retrofitting.Among all structural factors,financial subsidies have the greatest impact on motivating rural residents to participate in toilet retrofitting.Fourthly,the system dynamics method was used to construct a causal loop diagram from the perspective of various stakeholders involved in toilet retrofitting projects,revealing the causal interactions between different variables in the rural toilet retrofitting system.Among the variables,policy,subsidies,technology,satisfaction,and cooperation have the greatest impact on rural toilet retrofitting.Finally,a rural toilet system analysis framework was constructed,and typical toilet systems are quantitatively compared and analyzed.The traditional sanitation service chain was optimized,and a comprehensive evaluation system for rural toilet resource utilization is established.A multi-objective optimization method was used to construct an optimization model for the household toilet resource utilization system in rural areas,studying the three objectives of environmental risk,economic investment,and human living environment quality in the rural toilet fecal resource utilization system,and obtaining a Pareto optimal solution set.The Pareto frontier coupled Euclidean distance was used to optimize and evaluate the toilet retrofitting modes of typical practical cases.On the one hand,this study can serve as a methodological and motivational mechanism analysis reference for similar systemic problems.On the other hand,it can provide a solid foundation for determining comprehensive solutions to implement the "toilet revolution" in rural areas facing comparable challenges domestically and internationally.