Research On Economic Impact Analysis And Technical Path Optimization Of Water Pollution Abatement

Water pollution abatement is the comprehensive action that has complicated effects between the economic system and the environmental system.The discharge of water pollutants includes industrial sources,agricultural sources and urban source.There are great differences in the technical feasibility and economic feasibility among different sources.Taking multi dimension relationship among the economic,environment,and technology into account,establishing systematic method to quantitative assess the economic impact of water pollution abatement,and conducting water pollution abatement technologies according to different sectors and different pollutant discharge characteristics,are the essential foundation for the water pollution abatement.This study developed the technical and economic analysis model of water pollution abatement based on computable general equilibrium approach and multi-objective optimization method.Within the framework,water pollution abatement and economic behavior were characterized among industrial sectors,agricultural sector,and urban water sector;and economy-technology – environment multiple dimensions were connected.The model measured the economic impact of water pollution abatement and the distribution of abatement targets among different sectors from the macro perspective,and also provided technical pathways to achieve abatement targets with technical feasibility and economic feasibility form micro perspective.The integrated analysis model was consisted of water pollution abatement computable general equilibrium model and water pollution abatement technique optimization model.The water pollution abatement CGE model measured the macroeconomic impact of water pollution abatement and distributions of pollution abatement target among sectors.The result showed that: The impact of water pollution abatement was negative that GDP decreased by 0.09% when the total amount of COD and ammonia nitrogen discharge decreased by 10%;When environmental tax was 1.4 yuan / kg equivalent,GDP decreased by 0.026% and pollution discharged decreased by 3%;Key sectors of water pollution abatement,such as livestock and poultry breeding industry,water supply and wastewater drainage industry,and pulp and paper products industry,were recognized.The marginal abatement costs and pollution distributions among different sectors were calculated.The consumption of key sectors and sectors with high income elasticity of demand was sensitive to water pollution abatement.The marginal abatement cost of COD was lower than ammonia nitrogen.When COD and ammonia nitrogen discharge decreased by 10%,their marginal abatement were 39.1 and 308 thousand yuan per ton.Water pollution abatement technique optimization model focused on key sectors of paper industry,livestock industry and urban wastewater treatment industry.The result indicated that: for paper industry,the short-term technology could achieve optimal water pollution abatement goals,but the cost was still higher than expected.Under the long-term optimal technology,COD and ammonia nitrogen discharge could decrease by 11% and 55%,but the cost would increase by 59%.Technological progress and further investment was needed in paper industry;Dung cleaning system of livestock had major impact of water pollution discharge.Both the short-term and long-term optimal technology in livestock industry could achieve lower pollution discharge and lower costs than pollution abatement goals;For urban wastewater treatment industry,the short-term technology could achieve optimal water pollution abatement goals,but the cost was still higher than expected.The long-term optimal technology could achieve COD decreased by 87%,ammonia nitrogen decreased 91%,and abatement cost decreased by 3-5%.This thesis is meaningful to improve the decision-making ability of China in the field of water pollution abatement.The study is also helpful to develop the economic role of environmental and economic policies,to improve the efficiency of economic operation,and to promote the strategic layout and technological progress for the industry.