LCA-based Environmental Impact Assessment Of Emission Standard Upgrading Of Wastewater Treatment Plant In Chongqing

Water environmental protection is an important task that the future for a longperiod of our country at present. With the increasing requirements of environmentalprotection, urban sewage treatment plant emission standards will also be further strict.At present our country a lot of city or region is vigorously promoting the upgrade of thecity sewage treatment plant mentioned standard renovation, will undoubtedly bringgood effect of environmental protection of the local receiving waters, however, due tothe increasing upgrade may bring chemicals and energy, therefore may lead to complexlife cycle environmental impact. Study on life cycle environmental impact to upgradethe sewage plant, is of great significance to the treatment choice of China’s sewage andwater environmental protection policy and practice. In this paper, by the method of lifecycle assessment, the sewage treatment plant were analyzed in the upgradingtransformation of life cycle environmental impact range, identification and judgment ofthe environmental impact of city sewage treatment plant in upgrading and upgrading ofchange.According to the life cycle assessment before and after the upgrading process ofsewage treatment plant for the definition of goal and scope, its life cycle is divided intotwo parts: the scope of access to raw materials and transportation and construction stageand operation stage, and the analysis of life cycle inventory within the scope of thetransformation and upgrading of sewage treatment plant.Making the Li Jia Tuo sewage treatment plant as the research object for fieldinvestigation and monitoring of the before and after the upgrading of life cycle withinthe scope of the input and output data, and emissions at the same quality standards arecompared and analyzed. According to the practical situation of Chongqing city and theinfluence factors of different environment, we classify the Chongqing sewage treatmentplant in10factors including, greenhouse gas effect, fossil fuel consumption, non fossilfuel consumption, solid waste space, water, fog effect of aggregation, eutrophication,acidification, atmospheric photochemical smog, carcinogenic and non carcinogenicsubstances. According to the feature model of EPA published in different environment,using AHP to determine weights of different environmental impact categories, all kindsof environmental impact of sewage treatment plant is quantized. Li Jia Tuo sewagetreatment plant upgrade to cycle environmental impact than the sewage plant renovation before improves as a whole life, eutrophication potential decreased with the treatmentlevels increase, from a level B emission standard to the level A emission standard, adecrease of21.50%; however, atmospheric acidification, greenhouse gas, fossil fuelconsumption, solid waste space, haze aggregation, photochemical smog with theprocessing level increasing, carcinogenic and non carcinogenic effects with the use ofhigh energy consuming processing technology is on the increase. Effect of greenhousegas emissions from a B to a level A emission standard, an increase of6.97%, mainly dueto the consumption of fossil fuel consumption; from a level B emission standard to thelevel A emission standard, an increase of10.82%; solid waste space from a level Bemission standard to the level A emission standard, an increase of1.69%haze; gatheredfrom a level B emission standard to the level A emission standard, an increase of2.79%;atmospheric acidification from level B emission standard to the level A emissionstandard, an increase of7.32%; photochemical smog from a level B emission standardto the level A emission standard, an increase of5.71%; carcinogenic and noncarcinogenic substances from first level discharge standard to B level A emissionstandard, an increase of4.17%. According to the results of analysis calculation, putsforward some methods and suggestions to control. The paper gives an interpretationabout Li Jia Tuo sewage treatment plant of upgraded and upgrading process and severalother sewage treatment process based on life cycle assessment, and according to thecharacteristics of environmental life cycle stage, we put forward the correspondingcontrol measures and reduce the impact on factor.