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Pre-approval Public Notice for Environmental Impact Assessment of the Technical Renovation Project for Rare Earth Permanent Magnet Material Production Equipment and Ancillary Facilities of Ningbo Yuanchen New Materials Co., Ltd.
I. Overview of the Construction Project
Project Name: Technical Renovation Project for Rare Earth Permanent Magnet Material Production Equipment and Ancillary Facilities of Ningbo Yuanchen New Materials Co., Ltd.
II. Summary Table of Main Pollutant Generation and Emission for the Project
|
project |
category |
Pollutant name |
Generation |
Reduction amount |
Emissions |
|
exhaust gas |
Electroplating waste gas (tank breathing waste gas) |
Sulfuric Acid Mist |
0.0342 |
0.0162 |
0.018 |
|
Hydrogen chloride |
0.1346 |
0.0637 |
0.0709 |
||
|
hydrocyanic acid |
0.0015 |
0.0007 |
0.0008 |
||
|
Nitrogen oxides |
a small amount |
- |
a small amount |
||
|
ammonia |
0.1325 |
0.063 |
0.0695 |
||
|
Electrophoretic drying waste gas |
Non methane total hydrocarbons |
0.6 |
0.342 |
0.258 |
|
|
Airflow grinding dust |
particulate |
a small amount |
0 |
a small amount |
|
|
Adhesive waste gas |
Non methane total hydrocarbons |
a small amount |
0 |
a small amount |
|
|
Vacuum exhaust gas from sintering furnace |
particulate |
a small amount |
a small amount |
a small amount |
|
|
Non methane total hydrocarbons |
0.058 |
0.046 |
0.012 |
||
|
Odor from sewage treatment plant |
hydrogen sulfide |
a small amount |
/ |
a small amount |
|
|
ammonia |
a small amount |
/ |
a small amount |
||
|
waste water |
Electroplating wastewater |
Wastewater m ³/a |
52512 |
30912 |
21600 |
|
COD |
13.56 |
12.48 |
1.08 |
||
|
petroleum |
0.6485 |
0.6269 |
0.0216 |
||
|
Ammonia nitrogen |
1.197 |
1.089 |
0.108 |
||
|
total nitrogen |
12.2945 |
11.9705 |
0.324 |
||
|
total phosphorus |
1.1918 |
1.181 |
0.0108 |
||
|
total copper kg/a |
482.31 |
475.81 |
6.5 |
||
|
Total nickel kg/a |
2240.58 |
2239.45 |
1.13 |
||
|
total chromium kg/a |
39.6 |
39.2 |
0.40 |
||
|
Total zinc kg/a |
216.2 |
194.6 |
21.60 |
||
|
total cyanide kg/a |
106.2 |
101.88 |
4.32 |
||
|
Non electroplating production wastewater |
Wastewater m³/a |
15307.7 |
0 |
15307.7 |
|
|
COD |
18.032 |
17.2666 |
0.765 |
||
|
petroleum |
0.5593 |
0.5440 |
0.015 |
||
|
Ammonia nitrogen |
0.9384 |
0.8619 |
0.077 |
||
|
total nitrogen |
1.7595 |
1.5299 |
0.230 |
||
|
total phosphorus |
0.6447 |
0.6370 |
0.008 |
||
|
SS |
4.3424 |
4.1893 |
0.153 |
||
|
Total Zinc kg/a |
234.6 |
211.64 |
22.96 |
||
|
solid waste |
Waste chemical containers |
6.67 |
6.67 |
0 |
|
|
Waste filter element |
0.46 |
0.46 |
0 |
||
|
Plating tank slag |
2.60 |
2.60 |
0 |
||
|
Waste plating solution |
0.46 |
0.46 |
0 |
||
|
sludge |
585.1 |
585.1 |
0 |
||
|
Chemical nickel waste liquid |
5.62 |
5.62 |
0 |
||
|
Waste film |
0.04 |
0.04 |
0 |
||
|
Electrophoretic paint residue |
0.5 |
0.5 |
0 |
||
|
Waste cutting fluid/oil |
0.7 |
0.7 |
0 |
||
|
spent resin |
0.01 |
0.01 |
0 |
||
|
Waste activated carbon |
2.74 |
2.74 |
0 |
||
|
Magnetic mud |
30 |
30 |
0 |
||
|
Anode residue |
2.67 |
2.67 |
0 |
||
|
Scrap parts |
1 |
1 |
0 |
||
|
Leftover material |
105 |
105 |
0 |
||
III. Environmental Protection and Pollution Control Measures
During the implementation and operation of the project, all pollution prevention and control measures outlined in the report will be implemented, with a focus on the following tasks:
1、Strict implementation of water pollution prevention and control measures. The plant will strictly adhere to rainwater-sewage diversion, clean water-sewage diversion, and sewage-sewage diversion. The electroplating wastewater from this project, including comprehensive wastewater, copper pyrophosphate wastewater, alkaline copper wastewater, nickel-containing wastewater, electroless nickel wastewater, chromium-containing wastewater, and cyanide-containing wastewater, will be separately collected and treated in the electroplating wastewater treatment facilities. The wastewater discharged into the pipeline will comply with the indirect discharge limits for electronic components in Table 1 of the "Water Pollutant Discharge Standards for the Electronic Industry" (GB 39731-2020) and the indirect discharge requirements for the Taihu Lake basin in Table 1 of the "Water Pollutant Discharge Standards for Electroplating" (DB33/2260-2020). Non-electroplating production wastewater will be treated in non-electroplating production wastewater treatment facilities to meet the indirect discharge limits in Table 1 of the "Water Pollutant Discharge Standards for the Electronic Industry" (GB 39731-2020) before being discharged into the pipeline. Ultimately, the wastewater will be treated by the Xiexi Wastewater Treatment Plant to meet the Class 1A standards of the "Discharge Standard for Pollutants for Municipal Wastewater Treatment Plants" (GB18918-2002) before being discharged into the sea.
2、Strict implementation of air pollution prevention and control measures. Ordinary acid mist emissions will be collected, treated in an alkaline spray tower, and then discharged through a 15m-high exhaust stack. Similarly, ordinary acid mist emissions, ammonia gas, and tank breathing emissions will be collected, treated in an alkaline spray tower, and discharged through a 15m-high exhaust stack. Cyanide-containing emissions will be collected, treated with sodium hypochlorite alkaline spray, and discharged through a 25m-high exhaust stack. Electrophoresis drying emissions will be collected, treated in an activated carbon adsorption unit, and discharged through a 15m-high exhaust stack. Adhesive emissions will be collected and discharged through a 15m-high exhaust stack. Odor emissions from the wastewater station will be collected, treated in a water spray unit, and discharged through a 15m-high exhaust stack. Vacuum-extracted emissions from the sintering furnace will be filtered through the furnace's built-in filter, treated with a grease smoke purifier, and discharged through a 15m-high exhaust stack.
3、To mitigate the impact of noise on the surrounding environment, the following noise reduction measures will be taken: Low-noise equipment will be selected and appropriately arranged, and effective noise control measures such as sound insulation and vibration reduction will be implemented to ensure that the boundary noise complies with the Class 3 standards of the "Emission Standard for Industrial Enterprises Noise at Boundary" (GB12348-2008).
4、Diligent efforts will be made in solid waste pollution prevention and control. Strict implementation of solid waste pollution prevention and control measures will be carried out. In accordance with national and local regulations, solid waste will be classified, stored under shelter from rain, and safely disposed of following the principles of "reduction, recycling, and harmless treatment" to ensure that no secondary pollution is caused.
List of Major Pollutant Prevention and Control Measures for This Project
|
category |
pollutant |
Governance measures |
desired result |
|
|
waste gas treatment |
Electroplating waste gas (tank breathing waste gas) |
Hydrogen chloride, sulfuric acid mist, nitrogen oxides, ammonia, odor concentration |
After the secondary alkali solution spray treatment, it is discharged through a 15m high exhaust pipe. Electroplating line U-shaped closure, groove edge side suction+top suction. |
The standard limits in Table 5 and Table 6 of the "Emission Standards for Electroplating Pollutants" (GB21900-2008) and the secondary standards in the "Emission Standards for Odor Pollutants" (GB14554-93) |
|
hydrogen cyanide |
After sodium hypochlorite alkali spray treatment, it is discharged through a 25m high exhaust pipe. The workshop is fully enclosed. |
|||
|
Electrophoretic drying waste gas |
Non methane total hydrocarbons and odor concentration |
After being treated by the activated carbon adsorption device, it is discharged through a 15m high exhaust pipe. |
Concentration limits in Tables 1 and 6 of the "Emission Standards for Air Pollutants from Industrial Coating Processes" (DB33/2146-2018) |
|
|
Adhesive waste gas |
Non methane total hydrocarbons |
After collection, it is discharged through a 15m high exhaust pipe |
Table 2: Secondary Standards for New Pollution Sources in the Comprehensive Emission Standards for Air Pollutants (GB16297-1996) |
|
|
Odor from sewage treatment plant |
Hydrogen sulfide, ammonia, and odor concentration |
After being treated with water spray, it is discharged at a high altitude through a 15 meter exhaust pipe |
Secondary standard in the "Emission Standards for Odor Pollutants" (GB14554-93) |
|
|
Vacuum exhaust gas from sintering furnace |
Particulate matter, non methane total hydrocarbons |
After being filtered by the built-in filter of the sintering furnace and treated with an oil fume purifier, it is centrally discharged through a 15m high exhaust pipe |
Table 2: Secondary Standards for New Pollution Sources in the Comprehensive Control Plan for Industrial Furnace Air Pollution (Huan Da Shui [2019] No. 56) and the Comprehensive Emission Standards for Air Pollutants (GB16297-1996) |
|
|
waste water treatment |
Electroplating wastewater |
Adopting water-saving and clean production processes such as multi-stage recycling and countercurrent rinsing; The wastewater in the workshop is classified and diverted according to environmental regulations, and the process wastewater pipeline is laid overhead. The wastewater pipeline meets the requirements of anti-corrosion and anti-seepage; Strictly implement anti-corrosion, anti-seepage, and anti mixing measures in the workshop, and implement dry wet separation. Coking copper wastewater: After Fenton oxidation, it enters the alkaline copper wastewater treatment system; Alkali copper wastewater: After neutralization chelation+flocculation precipitation, it enters the comprehensive wastewater treatment system; Chemical nickel wastewater: After Fenton oxidation and ammonia oxidation to remove trace nickel chelation, it enters the nickel containing wastewater treatment system Nickel containing wastewater: After ion exchange and air flotation filtration, coagulation and precipitation of nickel meet the standard and enter the comprehensive wastewater treatment system; Chromium containing wastewater: After neutralization, coagulation, and sedimentation to meet chromium standards, it enters the comprehensive wastewater treatment system; Cyanide containing wastewater: enters the nickel containing wastewater treatment system through basic chlorine oxidation and Fenton oxidation Comprehensive wastewater: Fenton oxidation+coagulation sedimentation+catalytic oxidation+secondary sedimentation+sand filtration. After inspection, all pollutants meet the standards and are included in the Xiexi sewage treatment plant |
Meet the Class A standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) |
|
|
Non electroplating production wastewater |
After oil separation regulation, neutralization coagulation sedimentation, oxidation coagulation sedimentation and other treatments meet the standards, Xiexi Wastewater Treatment Plant |
|||
|
initial rainwater |
The factory area separates clean water and sewage, and separates rainwater and sewage. The enterprise has a 108m ³ initial rainwater collection tank. During the initial rainfall period, the rainwater is pumped to the sewage treatment station for treatment, and later the rainwater can be discharged into the municipal rainwater pipe network |
/ |
||
|
solid waste treatment |
General solid waste |
There is a temporary storage site for general solid waste, which can be sold for comprehensive utilization |
comprehensive utilization |
|
|
Hazardous waste |
There is a temporary storage room for hazardous waste, which is collected by classification and regularly handed over to qualified hazardous waste disposal units for disposal |
Safe storage, entrusted to qualified units for disposal |
||
|
noise |
noise |
① Select low-noise equipment; ② Take measures such as foundation, structural shock absorption, and noise reduction for different devices. |
The Class 3 standard requirements of the "Emission Standard for Industrial Enterprise Boundary Environmental Noise" (GB12348-2008). |
|
|
Groundwater and soil |
Sewage collection pipeline |
Each sewage collection pipeline adopts overhead pipe gallery for collection, and anti-corrosion and anti-seepage measures are taken for open ditches/pipe galleries. They are connected to the accident collection pool and have a certain slope. Once a pipeline leak occurs, the leaked wastewater can flow into the accident collection pool by itself. Prevent rainwater from entering. At the same time, it is necessary to set up groundwater monitoring wells |
Prevent soil and groundwater pollution |
|
|
Workshop anti-corrosion and anti-seepage measures |
Anti corrosion and anti-seepage measures for the production workshop, first floor hazardous waste storage room, and chemical warehouse floor |
prevent the pollution |
||
|
Accident risk |
Emergency plan |
Revise the emergency plan based on the characteristics of this project |
Reduce the impact of accidents |
|
|
strengthen management |
Develop operational standards and strengthen management |
Accident Prevention |
||
|
rational design |
The project adopts reasonable and effective risk accident prevention measures, and has a 140m ³ accident emergency pool. The effective volume of the project's comprehensive regulating pool is 150m ³, which can be used as an emergency pool in case of accidents. This project meets the discharge water volume of 12 hours |
Preventing and controlling accidents from causing pollution to the external environment |
||
IV. Total Emissions of Major Pollutants from the Enterprise:
After the completion of this project, the total emissions of Volatile Organic Compounds (VOCs) for the entire plant will be 0.265t/a. The fresh water consumption for electroplating will be 24,000t/a, and the discharge of electroplating production wastewater will be 21,600t/a, which contains: 1.08t/a of Chemical Oxygen Demand (COD), 0.108t/a of ammonia nitrogen, 0.324t/a of total nitrogen, 6.5kg/a of total copper, 1.13kg/a of total nickel, 0.40kg/a of total chromium, and 21.6kg/a of total zinc. The discharge of non-electroplating production wastewater will be 15,300t/a, which contains: 0.765t/a of COD, 0.077t/a of ammonia nitrogen, 0.23t/a of total nitrogen, and 22.96kg/a of total zinc.
Among these, the newly increased emissions of 0.005t/a of VOCs, 0.765t/a of COD, and 0.077t/a of ammonia nitrogen from the project must be addressed through regional equivalent substitution and reduction. Additionally, emissions trading for the newly increased COD and ammonia nitrogen will be required.
V. Conclusion of Environmental Impact Assessment
In summary, the construction of this project complies with relevant environmental protection approval requirements. If all the environmental protection measures proposed in this environmental impact assessment are implemented and the "Three Simultaneities" principle is ensured, its impact on the environment can be controlled within the permissible range, making it environmentally feasible.
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