Main environmental impacts and measures to prevent or mitigate adverse environmental impacts | Main environmental pollution prevention and control measures and emission standards. 1.Wastewater treatment measures and main environmental impacts
(1)Wastewater treatment measures
This project separates rainwater and sewage, and employees' domestic sewage is pretreated through oil separation tanks and tertiary septic tanks; The production wastewater is collected and treated according to classification and quality, and the first type of pollutant is treated separately. The cleaning wastewater is planned to be pre treated with oil and slag separation before entering the comprehensive wastewater treatment station together with other production wastewater for treatment. The designed treatment capacity of the sewage treatment station is 200m3/d, and the treatment process is primary coagulation sedimentation+hydrolysis acidification+contact oxidation+secondary sedimentation. It is discharged into the municipal pipeline network of the park and enters the water step sewage treatment plant for treatment. After meeting the treatment standards, it is finally discharged into public welfare water; The acidic wastewater generated during the pre passivation cleaning process enters the reclaimed water reuse facility with a designed treatment capacity of 28m3/d. It is treated using alkali neutralization, sand filtration, carbon filtration, bag filtration, UF membrane system, security filtration, and RO reverse osmosis system before being reused for pre passivation cleaning and not discharged externally.
(2) Impact on water environment
According to the evaluation conclusion of the report, production wastewater is treated by self built sewage treatment plants, and domestic wastewater is treated by septic tanks to meet the stricter third level standards of the second period of Guangdong Province's "Water Pollutant Discharge Limits" (DB44/26-2001) and the piping standards of water step sewage treatment plants. After that, it is discharged into the park's pipeline network and enters the Taishan Industrial New City Water step sewage treatment plant for treatment (the pre passivation cleaning wastewater is treated by the reclaimed water reuse facility and reused for pre passivation cleaning, and is not discharged outside). 2.Measures for prevention and control of atmospheric pollution and its environmental impact
(1)Measures for prevention and control of atmospheric environmental pollution
The melting smoke and natural gas combustion tail gas (low nitrogen combustion of the melting furnace) are collected and led to the bag filter device for treatment before being discharged through a 15m exhaust pipe (discharge port FQ-1). The natural gas combustion tail gas (low nitrogen combustion) from the static furnace is collected and led to a 15m exhaust pipe (discharge port FQ-2) for discharge. The exhaust gas from natural gas combustion (low nitrogen combustion) in the heat treatment line is collected and led to a 15m exhaust pipe (exhaust port FQ-3) for discharge. The sandblasting dust is discharged unorganized in the workshop after being treated by a self-contained bag filter device. The machining oil mist is discharged unorganized in the workshop after measures such as strengthening workshop ventilation and exhaust. After implementing measures such as strengthening the ventilation system in the workshop, the light acid mist was emitted in an unorganized manner. The exhaust gas from the dehydration furnace combustion (low nitrogen combustion) is collected and directed to a 15m exhaust pipe (discharge port FQ-4) for discharge. The powder powder from the bottom powder line is collected and led to the filter element for dust removal before being discharged through a 15m exhaust pipe (discharge port FQ-5). The bottom powder solidified natural gas combustion exhaust gas (low nitrogen combustion) is collected and discharged through a 15m exhaust pipe (discharge port FQ-6) after treatment. Three sprays and one drying line natural gas combustion (low nitrogen combustion) is collected and led to a 15m exhaust pipe (discharge port FQ-7) for discharge. The waste gases from powder coating curing, paint mixing, spray painting, leveling, and drying are collected and led to a multi-stage dry filtration dehumidification combined device+RTO combustion device for treatment before being discharged through a 15m exhaust pipe (discharge port FQ-8). The exhaust gas from the natural gas combustion of the two spray and one drying lines (low nitrogen combustion) is collected and discharged through a 15m exhaust pipe (discharge port FQ-9) after treatment. The kitchen fumes are collected and discharged through a 15m exhaust pipe (exhaust port FQ-10) after treatment. The exhaust gas from the backup generator is collected and directed to the oil fume purification device for treatment before being discharged through a dedicated smoke pipe to the rooftop (FQ-11) for discharge. (2)Atmospheric environmental impact
According to the evaluation conclusion of the report, (1) the maximum concentration ratio of the 8-hour average concentration contribution of TVOC under normal emissions from newly added pollution sources in the project, and the maximum concentration ratio of the hourly average concentration and daily average concentration contribution of xylene, sulfuric acid mist, fluoride, SO2, and NO2 to the standard, PM10、PM2.5、TSP、 The maximum concentration contribution rate of fluoride and sulfuric acid mist to the standard is ≤ 100%.
(2) Under normal emissions from newly added pollution sources in the project, the maximum concentration contribution rate of SO2, NO2, PM10, PM2.5, and TSP to the standard is ≤ 30%.
(3) Under normal emissions from newly added pollution sources in the project, the hourly average concentrations of xylene, fluoride, sulfuric acid mist, and the 8-hour average concentration of TVOC, when added to the current concentration, meet the environmental quality standards. The daily and annual average concentrations of SO2, NO2, PM10, and TSP, when added to the current concentration, ensure that the daily and annual average mass concentrations meet the environmental quality standards.
According to the prediction, under normal emission conditions, the maximum ground concentration of each pollutant at and outside the factory boundary does not exceed the short-term concentration standard value, so there is no need to set an atmospheric environmental protection zone for the project. 3.Noise pollution prevention and control measures and environmental impact
According to the report, the project will adopt a reasonable layout of the factory area and keep noise sources as far away as possible from surrounding sensitive points; Use low-noise equipment as much as possible for each process; Adopt noise reduction measures such as sound insulation, noise reduction, and vibration reduction for equipment with excessive noise. 4.Solid waste pollution prevention and control measures and environmental impact
According to the report, the main solid waste generated by the project includes waste molds, uncoated scraps, and non-conforming products; Waste packaging materials, powder dust, sewage treatment sludge, slag, aluminum shavings, waste emulsion, degreasing waste oil, waste tank liquid, waste tank slag, paint slag, waste filter bags, waste zeolite wheels, waste grease, waste raw material buckets, and household waste. Household waste should be handed over to the environmental sanitation department for removal.
General solid waste: Waste molds are handed over to metal recycling units for recycling and reuse; Excluding coated scraps and non-conforming products for reuse in melting casting; Waste packaging materials sold to waste recycling companies; Spray powder dust and sewage treatment sludge should be regularly disposed of by units with such waste treatment qualifications.
Hazardous waste: slag, dust residue from dust removal systems, aluminum shavings, waste emulsion, degreasing waste oil, waste tank liquid, waste tank slag, paint slag, waste filter bags, waste zeolite rotors, waste grease, waste raw material barrels, concentrated water from reclaimed water reuse facilities, and waste RO membranes from reclaimed water reuse facilities are classified as hazardous waste and should be disposed of by units with hazardous waste qualifications. 5.Groundwater Pollution Prevention and Control Measures and Environmental Impact
Effective prevention measures have been taken for various pathways that may affect groundwater in the project. While ensuring the implementation of anti-seepage measures and strengthening maintenance and environmental management within the factory area, the infiltration of pollutants generated by the project can be effectively controlled to avoid polluting groundwater. 6.Soil environmental pollution prevention and control measures and environmental impact
The soil environmental impact of this project mainly considers the entry of volatile organic compounds, the main pollutants of exhaust gas, into the surrounding soil through atmospheric dry and wet deposition; Wastewater from production or sewage treatment plants flows into the ground through vertical infiltration, causing soil pollution. Strengthen the operation supervision of organic waste gas treatment facilities, effectively reduce the emission of organic waste gas, and reduce the impact of atmospheric deposition on soil pollution; Hazardous waste storage areas, production workshops, etc. are strictly designed in accordance with relevant regulations, and anti-seepage measures are taken for each building of the wastewater collection system as required. 7.Environmental risk impact
The main environmental risk accidents that occur in this project include the leakage of hazardous substances and the consequences of associated/secondary hazardous waste and pollutant discharge caused by fires, explosions, etc., as well as the accidental discharge of sewage treatment plants and wastewater treatment facilities.
Through the implementation of risk prevention measures and the establishment of emergency plans, this project can effectively prevent and deal with risk accidents, and combine with the risk prevention measures and emergency plans continuously determined and improved by the enterprise in the next design and operation process. |
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