A Comparative Study On Indystrial Metabolism Analysis Of Circular Organic Milk Industry Chains And Conventional Milk Industry Chains

In recent years,people’s high concern for ecological environment and their own health has promoted the growth of organic milk consumption.Organic milk from the desert provides consumers with a pollution-free and highly nutritious food source,and the development of the organic forage cultivation-cow breeding-milk processing industry chain also effectively improves the ecological environment in sandy areas and contributes to the harmonious coexistence of human and nature.However,the industrial metabolic pathways and efficiency of the circular organic milk industry chains remains unknown.Therefore,this paper conducted an industrial metabolism analysis（IMA）research on the representative milk industry chains in the Ulan Buh Desert.Material flow analysis（MFA）models of the 3 circular organic milk industry chains and 3 conventional milk industry chains were established respectively,and the material metabolic pathways of different chains were compared and discussed.A new IMA evaluation index system was constructed to evaluate the unit/system industrial metabolic efficiency of the two scenarios.On the basis of IMA,data envelopment analysis（DEA）method was then introduced to assess and compare the comprehensive industrial metabolic efficiency of the two scenarios,both the advantages and disadvantages of the two types of industrial chains were analyzed,and suggestions for improvement were developed.The results showed that:（1）In terms of the industrial metabolism pathways,the circular organic milk industry chains add composting unit and wastewater and manure recycling unit compared with the conventional milk industry chains,and the organic fertilizer and wastewater are recycled by reasonable returning to the field,which realizes resource utilization and makes the material metabolism more complete.（2）The industrial metabolism efficiency of circular organic milk industry chains is also higher than that of conventional milk industry chains.For examples,the average values of the unit material recycling coefficients（R_i）of the cow breeding unit,wastewater treatment unit and aseptic filling unit of the 3 circular organic milk industry chains are77%,25%and 81.7%higher than those of the 3 conventional milk industry chains,respectively;and the average values of the unit waste emission coefficients（W_i）are70.1%,25%and 77.1%lower,respectively.The mean values of chain material recycling coefficient（R_i）and chain production coefficient（IP_i）of the circular organic chains are 47.97%and 11.41%higher than those of the 3 conventional chains,respectively.The average value of chain waste emission coefficient（IW_i）of the conventional chains is 15.69%higher than that of the circular organic chains;the mean values of chain material loss coefficient（IL_i）of the circular organic chains and the conventional chains are not significantly different.（3）The comprehensive industrial metabolic efficiency of the circular organic milk industry chains is also higher than that of the conventional milk industry chains.The circular organic chain 1 and the circular organic chain 3 both present DEA effective and have the highest comprehensive industrial metabolic efficiency;the comprehensive efficiency value of the conventional milk industry chains is smaller,which indicates a large distance from the effective production frontier and big potential for efficiency improvement.Above all,the industrial structure and the relationship among the material flows within the units of circular organic milk industry chains and conventional milk industry chains in the Ulan Buh Desert are researched,and the industrial metabolic efficiency of the two scenarios is compared,advantages of the circular organic milk industry chain are analyzed and suggestions for improvement are put forward.This study can provide a scientific basis for optimizing the layout of the milk industry,improving the overall environmental performance of the industry chain,and promoting the sustainable development of the organic milk industry in China.In addition,the material flow model and IMA evaluation index system constructed in this study can provide theoretical guidance for IMA of the milk industry and other related industries.