Study On Rural Household Biogas Ecological Treatment Model For Livestock Production Pollution Controlling In Nanjing County

With the fast development of livestock industry, the pollution caused by animal breeding is increasingly serious. The huge amount of livestock waste is the main source of agricultural non-point source pollution, and even more worse in the future. It is a must to strengthen the livestock pollution controlling and prevention, for fully implementing the Scientific Outlook on Development, building a new socialist countryside and realizing a harmonious socialist society. It is very important for resolving our country energy and environmental problem in rural areas that promoting the rural household biogas ecological treatment model. Biogas technique can combine with livestock industry. The prospective of the integration is positive. How to measure the actual effectiveness of these biogas projects appears to be particularly critical. Therefore, did a systematic research focus on using rural household biogas ecological treatment model to prevent pollution which cause by animal breeding. This research is not only favorable for reducing the pollution which cause by animal breeding, but also good for promoting the construction of household biogas digesters in rural areas.Nanjing county is in Zhangzhou city, Fujian province. It was selected as the study area in this paper. The studies were based on the basic theories of environmental science, agricultural ecology and environmental economic et al, and were integrated with the research approaches including information searching, expert consulting, questionnaire investigation, and data statistics et al. Then analyzed the actual condition in Nanjing county, such as the pollution of animal breeding and the situation of developing and using of biogas technology in rural areas. Based on survey data which coming from rural households of Xibian village, a deep research focus on overall efficiency in the economy, the environment, the social efficiency of rural household biogas ecological treatment model. Ultimately, compared "pig-biogas-fruit" with "Japanese Luo Dong fermentation means of breeding pigs"model, and then analyzed the theory, contrasted the advantages with the disadvantages between them. Major conclusions in this study are as follows:First, through mathematic analysis for breeding scale of livestock, the amount of pollutants producing and losing which generate by animal breeding and the situation of pollution control in Nanjing county. The study indicated the real preventing and controlling situation of animal breeding pollution, and comprehensive utilization status in this area, at last pointed out the main pollution controlling problems in the pig farm.Second, took the construction of household biogas digesters situation in Nanjing county for example, analyzed the feasibility of biogas ecological treatment model in the countryside. Through the stochastic questionnaire survey in Xibian village, Nanjing county, obtained the actual situation of adopting biogas technology, and summarized the problems which exist in the development and utilization of rural biogas ecological treatment model.Third, estimated the economy, environment and social efficiency for rural household biogas ecological treatment model respectively, the result demonstrated that biogas ecological treatment model had economical feasibility in preventing and controlling livestock's pollution whether to farmer or to society. It was worth to promote this model applied in the countryside. In fact, Biogas had a low utilization rate by farmers. Biogas effectiveness could hardly manifest. So this evaluation of economic benefits showed that, the construction of biogas digesters for farmers had no feasibility when biogas effectiveness was zero. Farmers didn't want to take the initiative to construct biogas digesters. The result of sensitive analysis indicated that the construction cost and benefits except from government subsidy were two critical factors that affect the farmer's positivity of constructing biogas digesters.Fourth, through case study of "pig-biogas-fruit" ecological pattern used in Xibian village, analyzed"Japanese Luo Dong fermentation means of breeding pigs" .Then introduced the theory, benefit analysis and contrasted the advantages with disadvantages. between them. Combining the actual situation, the agricultural structure adjustment and the need of ecological agriculture development in Nanjing county, then strongly proposed to promote the pattern of ecological technique for livestock breeding in this area.