Environmental Impact Assessment Research On The Construction Project Of Centralized Storage Of Waste Lubricating Oil And Waste Batteries

There are many kinds of toxic and harmful carcinogenic substances in waste lubricating oil and waste lead-acid batteries,which have great potential environmental hazards.Recycling and centralized storage is an effective way to strengthen environmental management of waste materials.In order to prevent the secondary pollution of waste lubricating oil and lead-acid battery in the process of recovery,transportation and storage,the environmental impact assessment should be carried out before the construction of such projects.In the existing environmental assessment documents,the annual average temperature is used to calculate the pollution source intensity,the annual comprehensive climate and meteorological parameters are used to predict the air pollution,and the average hydrogeological parameters are used to predict the groundwater.In the north of China,the climate and meteorological conditions change greatly all year round,which will have a significant impact on the pollution source intensity and the diffusion of pollutants in the environment of waste lubricating oil and waste lead-acid battery temporary storage project.Therefore,the impact of such projects on the regional environment under different conditions is also quite different.In this paper,taking the engineering example as the research object,setting various states to calculate the air pollutant emission separately,using the classification treatment to the regional hydrogeological parameters,and comparing and analyzing the prediction results of environmental impact in different states,the results accurately reflect the actual environmental impact law and state of the project.Based on the analysis of the project process flow and pollution generation nodes,it is determined that there are unorganized NMHC emissions in the tank farm,and there are petroleum hydrocarbon,acid substance and heavy metal lead emissions in the tank farm and the reservoir when the tank and waste battery are damaged.In the process of centralized storage of waste lubricating oil and lead-acid battery.The simultaneous emission of NMHC and high concentration sulfuric acid mist will have a comprehensive effect under certain conditions.Through matrix analysis,NMHC,sulfuric acid mist and lead dust are determined as the atmospheric evaluation factors,while petroleum,lead and its compounds,sulfate are determined as the groundwater evaluation factors.According to the climate characteristics of North China,five evaluation states of spring,summer,autumn,winter and annual average are set up.Under the five states,the intensity of small respiratory source is 0.106kg/d,0.126kg/d,0.102kg/d,0.142kg/d and0.109kg/d,respectively.In winter,it is the largest,in autumn,it is the smallest,and30.28%more than in winter.Under the five conditions,the source intensity of large respiration was 0.0293kg/d,0.0283kg/d,0.0284kg/d,0.03kg/d and 0.0283kg/d,respectively,which was the largest in winter and the smallest in summer,and exceeded the average annual average of 6.1%in winter.There is a big difference in pollutant emissions under different conditions.Therefore,seasonal prediction can more accurately describe the impact of pollutants discharged by the project on the surrounding environment.The air quality is predicted by AERMOD model,and the results show that:the contribution value of NMHC to the ambient air is the largest in summer,followed by spring,autumn and annual average,and the smallest in winter.In summer,the maximum landing concentration of NMHC,followed by spring and autumn.The contribution value of NMHC to the ambient air and the distance between the maximum landing concentration predicted by the five states are quite different,so it is more accurate to describe the influence range of NMHC by seasonal prediction.The permeability coefficient and water supply degree of hydrogeological parameters are divided into two grades,corresponding to two states.After 1000 days of pollutant leakage,Pb²⁺had the largest influence range,SO₄^2-followed by petroleum,SO₄^2-migration distance is the longest,Pb²⁺is the second,and petroleum migration distance is the closest.The influence range and migration distance of pollutants in state II are higher than that in state I.After 20 years of pollutant leakage,Pb²⁺is the most influential state,SO₄^2-is the second,and petroleum is the least.The influence range of pollutants in state II is higher than that in state I.However,under the condition of state I,SO₄^2-migration distance is the longest,Pb²⁺is the second,and petroleum migration distance is the closest.Under the condition of state II,the migration distance of Pb²⁺is the longest.The range and degree of influence of pollutants predicted by the two state parameters are different.It shows that the reasonable selection of model parameters can increase the accuracy of groundwater environment impact assessment results.