The Environmental Impact Assessment Of High-voltage Electrical Appliances Production Line Project

This study takes the example of high voltage switch cabinet production line project ofhigh-voltage electrical appliances manufacturing company. Considering the environmentfeatures and the environmental protection objectives of this region, we investigated andcollected the current information about the regiongl air environment, water environment andthe acoustic environment, and studied the pollution sources of the pollute process,construction period, and the run time during the construction of this project. We predicted andanalyzed the potential influences of the project to the air environment, water environment,acoustic environment and the solid waste, then put forward some suggestions of regionalenvironment protection. The results are as follows:1. We monitored the environmental quality conditions of the built-up areas. The fieldmonitoring result indicates that the air quality around the project is good, with the averageconcentration per day of TSP, SO2, NO2, PM10attained the Grade II “national standards for airquality”. In the2000meters along the Sha River downstream away from the prodwtion of thesewage treatment plant, except the total phosphorus exceeded the standard，other indicators allmeet the “Environmental quality standards for surface water”（GB3838-2002）. The regionalenvironmental noise of the construction site in the day and night all corresponded to classⅡarea of “Sound environmental quality standards”（GB3096-2008）, and the environmentalnoise near the side of Taibai Road meet the class4a standards.2. The analysis to the ambient air impact shows that the main atmospheric pollutionsources are spray paint waste gas, welding fume produced by the welding workshops, thesmoke from burning coal and oil fumes from canteen. The emission concentrations ofmethylbenzene and dimethylbenzene were less than60mg/m³and90mg/m³, which reachedto the grade II “discharge standard of air pollutants”（GB16297-1996）, after closed spraybooth process and filtration and activated charcoal adsorption process. The concentration ofwelding fume was greatly reduced after disposed. The flue dust emission concentration wasabout0.01mg/m³and the emission amount was2.6×10^﹣4t/a, which reached to the grade II“discharge standard of air pollutants”（GB16297-1996）. The canteen was equipped with flueto extract the smoke from burning coal and the flue was about12meters high. The oil fumes from canteen were discharged by oil fume purifier. The emission amount of oil fumes was1.728t/a and the concentration of oil fumes was0.48mg/m3, which reached the highest theupper limit for emission concentration of oil fume in the “emission standard of cooking fume”（GB18483-2001）and exerted little influence on the surrounding air environment.3. The analysis to the water environmental impact shows that during the operating, themain waste water was domestic sewage. The domestic sewage can reach the third level of“Synthetical draining Standard of Sewage”（GB8978-1996）after precipitated by the installedgrease trap in the plant area. The analysis of environmental noise impact indicated that theenvironmental noise on1^#,2^#,4^#,5^#, and6^#sites of the project meet the ClassⅡArea of“Sound environmental quality standards”（GB3096-2008）, and the traffic noise on3^#and7^#sites meet the class4a standards.4. The analysis of solid waste environment impact shows that, the solid waste producedby the production process won’t produce a secondary pollution to the environment throughproperly handle and disposal or comprehensive utilization and strengthening daily supervisionand administration instead of discharge.5. This paper explored the feasibility of the main measures for the pollution preventionduring the production process. The major environmental pollution of this project is waste gaspollution. The spray paint waste gas can reach the grade II “discharge standard of airpollutants”（GB16297-1996）through closed spray booth process, filtration and activatedcharcoal adsorption process and devising the exhaust funnel height（H=15m, D=0.5m）.Mechanical exhaust fan can be set up to the workshop to increase ventilation of the workshopand the welding fume was collected by removable venting pipe to control the welding fumepollution produced by the welding workshop. The fume was exhausted through the funnelafter dust extraction treatment. The concentration of welding fume was greatly reduced to0.01mg/m³, and the emission amount was2.6×10^﹣4t/a, which reached to the grade II“discharge standard of air pollutants”（GB16297-1996）.