| Biogas is seen as a kind of clean energy that is high heat efficiency,high burning rate and high convenient.In rural areas,Biogas not only can promote the use of energy conservation and emissions reduction,optimize the structure of rural energy consumption,reduce the air pollution and agricultural non-point source pollution,but also can promote ecological agriculture,circular agriculture and modern agriculture construction,enhance the economic income of farmers,produced a series of economic,ecological and social benefits.But in recent years,With the speeding up of urbanization rate and the change of peasant household production,life,living and the way energy use,the biogas utilization of environment and the development of dynamic has changed,these changes results in a series of phenomenonfor example,biogas utilization rate is reduced,regional adaptation degree is weaken,biogas project running effect is poor,The comprehensive utilization level of "three fen" is lower.In the new period,biogas project construction how to comply with the national development and the new normal,the new situation,and correctly grasp the development direction,and promote biogas career steadily forward,these important problems to be solved.Therefore,this article objectively evaluate the biogas utilization comprehensive benefits,according to biogas utilization present situation and the current situation,the biogas utilization sustainable development path can be summarized,countries and regions can formulate biogas energy development policies.On the basis of a wide range of investigation in the guanzhong area,this article select zhouzhi county,wugong county,xingping county as typical cases,because this county well promote biogas.Combined with the 417 survey data and relevant statistical data and information data,firstly,this article analyze biogas utilization at present,and evaluate the adaptability of rural household biogas utilization degree,with the principal component analysis,the purpose make sure that Biogas utilization benefit evaluation is meaningful.And then the economic benefits of biogas utilization were summarized,including direct economic benefits and indirect economic benefits),ecological benefit and social benefit,these benefits be quantified and monetization,it that biogas utilization of economic comprehensive benefits are concluded.The feasibility of biogas project is evaluated with cost effective method and financial index analysis method.Draw the following conclusions:Rural household biogas digester effect is significant in the study area,the effect of using is poor.The rate of the biogas attain is 37.17%,however,the usage rate is poor,the massive biogas tank were abandoned,scrap rate is as high as 57.42%.With the principal component analysis,the results show that the biogas utilization degree of regional adaptability is low（0<comprehensive score<1）,the research indicates that the development of biogas using is existing obstacles in the area.Biogas is a kind of clean and efficient energy,it can broad prospects for application development and generate multiple benefits.In the aspect of economy.Biogas alter low-quality,high carbon energy,biomass energy and higher priced goods so that produce direct economic benefits,Biogas slurry renewal resources as bog fat can effectively reduce the consumption of chemical fertilizers,pesticides,and optimize the quality of agricultural products,and bring indirect economic benefit for farmers.In In the aspect of ecological,biogas utilization can reduce emissions of CO2 and CH4 gas,SO2 and other greenhouse and pollution gases.In the aspect of social,biogas development and utilization bring benefits for agricultural production,farmers and rural life and so on various aspects.Biogas utilization is produced comprehensive economization benefits that amounted to 1146.64 yuan,biogas utilization cost including building the initial investment,feeding,management,maintenance and so on,using the method of cost-benefit analysis and financial index analysis,biogas project financial present value amount to 7433.85 yuan that is greater than zero,the project investment payback period is 2.6 years,and is relatively short,the internal rate of return is 68.93%,higher than the social discount rate of 8%.Thus it can be seen that the study area has high utilization project economic feasibility of biogas and remarkable comprehensive benefit.Biogas utilization benefit is remarkable and suitable for widely use.Low biogas utilization,high scrap rate and low adaptability of the status and the current situation of social and economic development put forward the sustainable development of biogas utilization path in the future.on the basis of low biogas utilization,high scrap rate and low adaptability of the status and the current situation of social and economic development,the biogas utilization path is raised in the future.The guanzhong regional economic development,topography and agricultural production mode is different,according to local conditions and formulate appropriate development mode,each region should adjust measures.Developing regions,mountainous area and traditional farming area recently still is given priority to the traditional household biogas.These regions take the sustainable development path that need promote transformation process,raw material supply and maintenance service and so on;biogas construction can turn to large partnerships biogas digester in the suburban and developed areas,,and run the path of biogas utilization healthy and stable development with a new model.The sustainable development path of biogas utilization was advance fermentation raw materials,technology innovation,industry commercialization,marketization,industrialization,large-scale engineering,property management,professional direction. |
