Optimization Of Municipal Solid Waste Treatment Technology In The Ecologically Fragile Area Of Northwest China

In recent years,with the gradual advancement of the urbanization process in Northwest China,the amount and types of urban domestic waste have increased sharply.Some cities and regions have even seen the phenomenon of "garbage besieging".Northwest China has been an important ecologically fragile area in my country since ancient times.The degree of importance is self-evident.Based on the current status of urban domestic waste treatment and utilization in Northwest China,this paper comprehensively analyzes the three main waste treatment technologies of sanitary landfill,incineration and composting,and selects the most suitable domestic waste treatment technologies for the future development of the ecologically fragile northwestern area.This study uses qualitative issues to be treated quantitatively,and the life cycle assessment method is coupled with the analytic hierarchy process,and the life cycle assessment method is used to analyze different types of environmental impacts and use them as related indicators.Based on this,an evaluation system for municipal solid waste treatment technology in the ecologically fragile northwestern area with 4 levels and 17 indicators was established,and take the existing domestic waste treatment technology in Lanzhou as a research case,and the existing domestic waste treatment technology in Lanzhou as a research case,to select the most suitable local domestic waste from sanitary landfill,incineration and compost treatment technologies Processing technology.The main conclusion is:according to the results of life cycle assessment,the environmental impact potential values of sanitary landfill,incineration treatment and compost treatment technologies in Northwest China are respectively 0.0991,0.0155 and 0.0093,respectively.The environmental impact potential value of sanitary landfill is higher than the other two treatment technologies.Using the analytic hierarchy process,the evaluation system of municipal solid waste treatment technology in the ecologically fragile northwestern region was established,and the applicability scores of three solid waste treatment technologies were calculated based on relevant national standards.Sanitary landfill technology（75.29）>compost treatment technology（70.19）>incineration treatment technology（63.89）.Shows that at this stage,sanitary landfill is still a domestic waste treatment technology suitable for ecologically fragile areas in Northwest China.In the future,with economic development and technological innovation,Northwest China should start from "composting as a supplement"is transformed into a technical route of "incineration as the mainstay and landfill compost as a supplement",gradually reducing the proportion of sanitary landfill treatment.