Establishment Of Technical Evaluation Index System For Comprehensive Utilization Of Manure In Small And Medium-Sized Pig And Cattle Breeding Industry

With the development of China economy,large-scale pig and cattle breeding industry has become an important pillar industry for agricultural development and farmland income increase.At the same time,farmed excrement has become a huge source of pollution,posing a serious threat to the ecological environment.At present,large scale pig cow farms are widespread investment,low processing efficiency,using the technology don’t match,there is no clear specification and technical guidance,especially small and medium-sized farms,due to the small herds,its pollution charge proportion is much higher than large farms,severely restricted the sustainable development of large-scale pig cow breeding industry.So to build a scientific and reasonable small and medium-sized pig cow farm waste comprehensive utilization of waste technology evaluation system,in the existing waste comprehensive utilization technology assessment,to select suitable,economically feasible,good comprehensive benefit of waste comprehensive utilization technology,is the key to the sustainable development of large-scale pig cow breeding,is to raise efficiency of utilization of waste recycling to reduce the cost of the pollution treatment important measures for cracking waste management problems.This topic in view of the small and medium-sized pig cow breeding industry waste comprehensive utilization present situation and the technology demand,using analytic hierarchy process(ahp),expert consultation method and fuzzy comprehensive evaluation method to establish a set of scientific,fair and reasonable,small and medium-sized pig cow breeding industry waste comprehensive utilization technology evaluation index system and evaluation model,and combining the research status quo of small and medium-sized pig cow breeding industry waste comprehensive utilization technology,the evaluation of technology screening the best feasible technology listing,established the technical model which can be promoted.The greenhouse gas emissions of large-scale dairy farming enterprises in Hebei province were calculated,which provided technical support and data support for greenhouse gas emission reduction of large-scale dairy farming enterprises.The research results obtained are as follows:1)On the basis of the research on the relevant policies and disposal technologies,a scientific,fair and reasonable technical evaluation index system for the comprehensive utilization of manure in the small and medium-sized pig and cattle breeding industry was established by using the analytic hierarchy process and expert consultation method,including 4 indexes in the criterion layer,15 indexes in the evaluation layer and 20 indexes in the index layer.The weight of each level index is determined by the analytic hierarchy process combined with expert consultation.2)Fuzzy comprehensive evaluation method is used to determine the membership function of each evaluation index and realize the quantification of evaluation index at all levels.The pre-evaluation criterion and evaluation criterion for the screening of the best feasible technology are also formulated.3)Using the established evaluation method and evaluation model of the evaluation index system for the comprehensive utilization of manure in the small and medium-scale pig and cattle breeding industry,the current situation investigation and technical evaluation of 15 large-scale pig and cattle breeding enterprises were carried out,and the list of best available technologies was screened out and established It is applicable to the comprehensive utilization technology model of manure and sewage that can be promoted in small and medium-sized pig and cattle breeding farms.4)Using the calculation method 2 provided in IPCC Guidelines for National Greenhouse Gas Inventory 2006,the emissions of intestinal fermentation methane from cows,emissions of methane and nitrous oxide from manure management,and carbon dioxide emissions from fuel and electricity from four large-scale dairy farms in Hebei province were calculated.The contribution rate of different links to greenhouse gas emission,emission factor of each link and greenhouse gas emission of average unit standard milk are determined.