Environmental Impact Report of Hunan Lier Circuit Board Co., Ltd. Etching Waste Liquid Recycling System Project Table 2.3-1 Environmental Quality Standards Environmental Quality Standards Environmental Category Pollutant Name Value Time Limit Level Concentration Unit Standard Name Environmental Air SO2 TSP PM10 NO2 Daily Average Hourly Average Daily Average Daily Average Daily Average Hourly Average Level 2 0.15 0.50 0.30 0.15 0.08 mg/Nm3 0.20 "Environmental Air Quality Standards" (GB3095-2012) Level 2 Standard Hydrogen Chloride Ammonia Once Daily Average Once Daily Average -- 0.05 0.015 0.20 - "Industrial Enterprise Design Hygiene Standards" (TJ36-79) Sound Equivalent Daytime Environmental Sound Level Nighttime Class 3 65 dB(A) 55 "Environmental Noise Quality Standards" (GB3096-2008) Class 3 Standard -- Class II Class III Dimensionless pH 6-9 6-9 CODCr 15 20 Ammonia Nitrogen 0.5 1.0 Surface Water Copper 1.0 Cd 0.005 TP 0.1 Hg 0.00005 As 0.05 LAS 0.2 1.0 0.005 0.2 mg/L 0.0001 0.05 0.2 "Surface Water Environmental Quality Standards" (GB3838-2002) Class II and III Standards Volatile Phenol 0.002 0.005 Petroleum 0.05 0.05 BOD5 3 4 PH 6.5~7.5 Pb ≤300 Zn ≤250 Cd ≤0.3 Soil Hg ≤0.5 mg/kg As ≤25 "Soil Environmental Quality Standards" (GB1518-1995) Level 2 Standard Cr ≤300 Sb ≤ Cu ≤100 Pollutant Emission Standards Project Pollutant Name Emission Limit Standard Hydrogen Chloride 30mg/m3 Waste Gas Ammonia 4.9kg/h "Electroplating Pollutant Emission Standards" (GB21900-2008) Table 5 -- "Odorous Pollutants Emission Standards" (GB14554-93) Other Plating Types 37.3m3/m2 Unit Product Benchmark Exhaust Volume According to "Electroplating Pollutant Emission Standards" (GB21900-2008) Table 6 -- Maximum Allowable Emission Concentration of Class II Pollutants Wastewater pH 6~9 "Comprehensive Wastewater Discharge Standards" mg/L (GB8978-1996) Class 3 Standard 6 Environmental Impact Report of Hunan Lier Circuit Board Co., Ltd. Etching Waste Liquid Recycling System Project COD 500 BOD5 300 SS 400 Ammonia Nitrogen -- Petroleum 20 Fluoride 20 Sulfide 1.0 Animal and Plant Oil 100 Total Copper 0.5 "Electroplating Pollutant Emission Standards" (GB21900-2008) Table 2 Emission Limit Factory Boundary Noise During operation, implement "Industrial Enterprise Factory Boundary Environmental Noise Emission Standards" (GB12348-2008) Class 3 Standard Household Waste Household waste implements "Pollution Control Standards for Landfill of Household Waste" (GB16889-2008) General Solid Waste General Solid Waste Implements "General Industrial Solid Waste Storage and Disposal Site Pollution Control Standards" (GB18599-2001) Hazardous Waste Hazardous waste storage implements "Hazardous Waste Storage Pollution Control Standards" (GB18597-2001) Note: The height of the exhaust pipe for hydrogen chloride and ammonia gas is 15m, and ammonia gas utilizes the existing waste gas treatment system of Lier Company. Table 2.3-2 Liuyang Industrial Park Wastewater Treatment Plant Discharge Standards Unit: mg/L Pollution Source Pollutant Control Period Category Limit Standard Name NH3-N 8 "Urban Wastewater Treatment Plant Pollutants Household Wastewater SS After 1998.1 Level 1 20 Discharge Standards" (GB18918-2002) Class A CODCr 60 Level B Production Class II Wastewater Pollutants Total Cyanide Total Copper pH SS After 1998.1 Level 1 CODCr Phosphate Ammonia Nitrogen 0.5 0.5 6-9 "Urban Wastewater Treatment Plant Pollutants 20 Discharge Standards" (GB18918-2002) Class A 60 Level Standard B 0.5 15 2.4 Evaluation Work Level (1) Ambient Air According to the engineering analysis, the maximum ground concentration of the main atmospheric pollutant hydrogen chloride for this project accounts for 4.06% of the standard rate, and the maximum ground concentration of ammonia accounts for 4.69%, both less than 10%. According to the evaluation level classification regulations of HJ2.2-2008, the ambient air evaluation level is classified as Level 3. (2) Water Environment According to the engineering analysis, the project discharges wastewater at 1.65m3/d. The production wastewater is pre-treated at the on-site sewage treatment station and then combined with the domestic sewage treated by the septic tank to meet the Class 3 standard of the "Comprehensive Discharge Standard for Wastewater" (GB8978-1996), discharged into the Liuyang Industrial Park sewage pipeline network, and after treatment at the Liuyang Industrial Park sewage treatment plant, meets the Class 1 standard B of the "Pollutant Discharge Standard for Urban Sewage Treatment Plants" (GB18918-2002), and is discharged into the Laodao River section of the Liuyang Industrial Park. The Laodao River is a medium-sized river, and the receiving river section implements the Class III standard in the "Surface Water Environmental Quality Standards" (GB3838-2002). According to the guidelines (HJ/T2.3-93), the water environment impact evaluation level for this project is determined to be Level 3. (3) Sound Environment This project is located within the Liuyang Industrial Park, and the sound environment functional zoning is classified as Class 3 according to GB3096-2008, with no residential areas or other noise-sensitive points nearby, surrounded by industrial enterprises and land for future industrial use. After the project is completed, the increase in noise level outside the factory boundary is minimal. According to HJ2.4-2009, the sound environment evaluation level for this project is Level 3. (4) Environmental Risk Evaluation Work Level According to the identification and analysis of major hazardous sources (GB18218-2000), detailed in Chapter 6.1, the storage amount of the toxic substance liquid ammonia involved in this project does not exceed the critical amount and does not belong to major hazardous sources; moreover, the project site is located within the Liuyang Economic Development Zone, which is not an environmentally sensitive area. Based on the determination criteria for risk evaluation levels in the "Technical Guidelines for Environmental Risk Assessment of Construction Projects" (HJ/T169-2004), the evaluation level for this risk assessment is determined to be Level 2. 2.5 Evaluation Scope (1) Ambient Air Evaluation Scope The evaluation scope is a circular area with a radius of 2.5 km centered on the plant site. (2) Surface Water Environment Evaluation Scope The evaluation scope is 500m upstream from the discharge outlet of the Liuyang Industrial Park sewage treatment plant to 15km downstream (the intake of the Liuyang Yong'an Water Plant is 14km downstream, and the intake of the Liuyang Industrial Park Water Plant is 1000m upstream). (3) Sound Environment Evaluation Scope The evaluation scope is within 100m outside the project factory boundary. (4) Risk Evaluation Scope The atmospheric evaluation scope for risk assessment is no less than 3km from the source point, and the surface water evaluation scope is the same. 2.6 Environmental Protection Objectives The main environmental protection objectives of the project are shown in the table below and in Appendix 4. Table 2.6-1 Protection Objectives and Sensitive Points Category Protection Objectives Environmental Protection Objectives Overview Orientation Distance Protection Level Environmental Evaluation Scope Employee dormitory of Interface Optoelectronics Company, 4 buildings, approximately 10,000 employees to the north, 425m. "Ambient Air Quality Standard" (GB3095-2012) residents, schools, Hunan Gushan Bioenergy Company, approximately 800 employees to the northwest, 615m. Approximately 400 employees North, 415m Class II Standard Shenli Ling Adhesive Manufacturing Company, approximately 600 employees to the south, 145m. Hunan Jiaqing Environmental Protection Equipment Company, approximately 300 employees to the southwest, 310m. Employee dormitory within Lens Technology Company, approximately 16,000 employees to the west, 110m. Employee dormitory within Lens Technology Company, approximately 1,200 employees to the east, 150m. Hunan Lier Company office area. Approximately 200 employees Company's internal Liuyang Industrial Park sewage treatment Sewage Treatment Northwest, Treatment Plant 20,000 m3/d 4,000m Liuyang Industrial Park sewage treatment Water Environment -- Factory discharge outlet Class III water functional area Northwest, 3,500m -- Yong'an Water Plant (14km downstream from the sewage treatment plant discharge outlet) Drinking water source Class I protection Northwest, area, Class II functional area 14,000m Shenli Ling Adhesive Manufacturing Company Sound Environment -- Employee dormitory within Lens Technology Company, approximately 600 employees. Employee dormitory within the company, approximately 17,000 employees to the south, 145m. To the west, 110m. "Sound Environment Quality Standard" (GB3096-2008) Class 3 standard. Employee dormitory within Lens Technology Company, approximately 1,200 employees to the east, 150m. Note: The project site is about 650m from the western county road (X011) and about 175m from the southern national road (G319). 2.7 Focus of Evaluation Work The focus of this environmental impact assessment work is on engineering analysis, pollution prevention measures analysis, atmospheric and water environment impacts, and environmental risk assessment. 9 Hunan Lier Circuit Board Co., Ltd. Etching Waste Liquid Recycling System Project Environmental Impact Report Chapter 3 Project Overview and Engineering Analysis 3.1 Hunan Lier Circuit Board Co., Ltd. Current Status Hunan Lier Circuit Board Co., Ltd. is a high-tech enterprise specializing in the production of electronic materials in China. The company invested 58 million RMB in 2008 to construct a "400,000 m2/a High-Precision PCB Board Factory Project" in the national-level Liuyang Economic and Technological Development Zone (formerly Hunan Province Changsha National Bio-Industry Base), including: 200,000 m2/a for four-layer boards, 160,000 m2/a for 6-10 layer boards, and 40,000 m2/a for gold finger (circuit boards requiring chemical nickel/gold plating). In November 2008, the Hunan Provincial Environmental Protection Department approved the environmental impact assessment with document number Xiang Huan Ping [2008] 185. The trial production started in May 2010, and in August 2011, the Hunan Provincial Environmental Protection Department approved the acceptance with document number Xiang Huan Ping Yan [2011] 53. Hunan Lier's headquarters has a total land acquisition of 79.31 acres in the Liuyang Industrial Park, divided into two projects: the electronic materials company (occupying 42.31 acres) and the circuit board company (occupying 37 acres), both located in the same factory area. The eastern side of the factory area is reserved for the company's future development, the southern side is Shenli Adhesive Company, the western side is Lens Technology Company, and the northern side is the directly affiliated Lier Electronic Materials Company (which shares the same factory area with this project), while the northern side outside the factory is the production area of Lens Technology. The relationship between Hunan Lier Circuit Board Company, the location of this project, and the surrounding environment is detailed in Figure 3.1-1. The current actual output is approximately 280,000 square meters of circuit boards per year. 3.1.1 Geographical Location: Hunan Lier Circuit Board Co., Ltd. is located in the southeastern part of the national-level Liuyang Economic and Technological Development Zone. Text Printing G.L Stamping Forming G.W.S G.S Testing G.W.L Finished Product Shipment G.W.L S: Solid Waste W: Wastewater G: Waste Gas L: Waste Liquid Main Production Equipment: The main production equipment for circuit board production is shown in the table below: Overview of Main Production Equipment Product Name Specifications Quantity: Light Drawing Machine 10000DPI 1: Substrate Production Screen Exposure Machine: Weichuangxin 6: Oven Weichuangxin 6: Film Lamination Machine Weichuangxin 3: Inner Layer Exposure Machine UVE-7K, Weichuangxin 9: AOI CAMTEK 6: Laminating Machine Two Heat One Cold, Automatic Loading 3: Reflow Line 3: Laminating Drilling Target Machine Taiwan Haoshuo, Taiwan Fiber 4: Riveting Machine 1: Central Vacuum Cleaner Shenzhen 2: Drill Bit Grinding Machine Shenzhen 3: Shearing Machine Hunan 1: Drilling CNC Drilling Machine HITACHI, WD-03 16: CNC Profile Milling Taiwan Dazhong 6: Finished Product Cleaning Machine WYD-CW-S-QX 3: Through Hole Plating Plating Line LY-01, LY-04 4: SES Line Universe 3: DES Line Universe 3: Outer Layer Developer Universe 3: Precision Brush Board Machine Universe 3: Solder Mask Printing Chemical Cleaning Machine Universe 3: Oven Chuangke 9: Nickel/Gold Plating Manual Nickel/Gold Plating Line Small 1: Semi-Automatic Screen Printing Machine 10: Text Printing Screen Printing Table 10: Stamping Forming CNC Profile Milling TR-50A 3: 12 Hunan Lier Circuit Board Co., Ltd. Etching Waste Liquid Recycling System Project Environmental Impact Report Section Product Name Specifications Quantity: V-CUT Machine VC-460 3: OSP Line Universe 1: Cleaning Machine Universe 6 Detection Test Machine Flying, WTD 9 Metallographic Grinding Machine 2 Pure Water System Yimin 2 Central Chilled Water System 15HP 3 Public Equipment Air Compressor ATLAS/50HP, ATLAS/15HP 3 50-100 Ton Cooling Towers (including water pumps) 3 Water Pumps 4 3.1.2.3 Main Raw and Auxiliary Materials and Consumption Table 3.1-2 Main Raw and Auxiliary Materials and Consumption Table Number Product Name Department Annual Usage Current Storage Volume 1 Rigid Copper Clad Laminate Substrate Production 450,000 m2 29,321 m2 2 Semi-Cured Sheet Lamination 200,000 m2 101 Roll 3 Covering Film Lamination 3m2 384 Roll 3 Electrolytic Copper Foil Lamination 60t 7,750 kg 4 Silver Salt Film Inner Layer, Outer Layer, Solder Mask Printing 1,080 Boxes 5 Boxes 5 Ammonium Hydroxide Stamping, Testing 3,000L 1,120 Bottles (560L) 6 Photoresist Dry Film Inner Layer, Outer Layer 800,000 m2 384 Roll 7 Photoresist Ink Inner Layer 36t 16 kg 8 Photoresist Solder Mask Ink Solder Mask Printing 60t 1,704 kg 9 Text Ink Text Printing 3t 180 kg 10 Peelable Blue Glue Solder Mask Printing, Text Printing 1.5t 0 kg 11 Tape Inner Layer, Lamination, Drilling, Through Hole Plating, Outer Layer, Solder Mask Printing, Nickel/Gold Plating, Stamping, Text Printing, Testing 15,000 Rolls 2,699 Rolls 12 Thin Aluminum Plate Drilling 30t 7,000 Sheets 13 Wood Fiber Board Drilling 180,000 Sheets 4,250 Sheets 14 Kraft Paper Lamination 5t 1,000 kg 15 Cotton Filter Element Through Hole Plating, Outer Layer, Inner Layer, Solder Mask Printing, Stamping 1,200 Pieces 165 Pieces 16 Screen Wash Water Solder Mask Printing 5t 1,500 kg 17 Caustic Soda Through Hole Plating, Outer Layer, Inner Layer, Solder Mask Printing, Stamping 60t 2,000 kg 18 Sulfuric Acid Through Hole Plating, Outer Layer, Inner Layer, Solder Mask Printing, Stamping 60t 2,930 kg 19 Sodium Hydroxide Through Hole Plating, Outer Layer, Inner Layer, Solder Mask Printing, Stamping 30t For Caustic Soda 20 Sodium Carbonate Inner Layer, Outer Layer, Solder Mask Printing 45t 750 kg 21 Gold Salt Nickel/Gold Plating 8,000 grams 200 grams 22 Chemical Nickel Solution Nickel/Gold Plating 4.5 t 0.25 t 23 Potassium Permanganate Through Hole Plating 3t 50 kg 24 Acid Cleaner Inner Layer, Outer Layer 1t 0 kg 25 Alkaline Cleaner Through Hole Plating 1t 0 kg 26 Sodium Persulfate Through Hole Plating, Stamping 60t 1,000 kg 13 Hunan Lier Circuit Board Co., Ltd. Etching Waste Liquid Recycling System Project Environmental Impact Report Number Product Name Department Annual Usage Current Storage Volume 27 Hydrogen Peroxide Through Hole Plating 30t 250 kg 28 Phosphor Copper Anode Through Hole Plating 30t 2,000 kg 29 Pure Tin Anode Through Hole Plating 15 t 300kg 30 Alkaline etching solution Through Hole Plating 60t 0kg 31 Tin stripping solution Through Hole Plating 1t 0kg 32 Brown solution Lamination 60t 560L 33 Anti-oxidation solution Testing 3000L 0L 34 Activation solution Through Hole Plating 3000L 0L 35 Electroplating brightener Through Hole Plating 18000L 0L 3.1.3 Evaluation of major pollutant emissions and treatment measures. The analysis of the pollutant discharge and treatment measures of the Lier circuit board project is based on the original environmental impact assessment report, acceptance monitoring, and the actual situation of the enterprise, explaining the compliance of each pollutant's discharge. Wastewater discharge and treatment measures. The discharge and control measures of wastewater pollutants are shown in Table 3.1-3. Wastewater pollutant discharge and control measures. Serial number, pollution source, source, treatment capacity (t/d), main pollutants, discharge direction. 1 Non-complex wastewater from substrate production, inner layer production, lamination, through-hole electroplating, solder mask printing, stamping, and testing processes, wastewater treatment tower spray washing liquid, COD, copper, cyanide 730. 2 Complex wastewater from inner layer production, through-hole electroplating, and testing processes, Lier electronic materials factory rinsing water, copper 172. Production wastewater is treated by the factory's sewage treatment station and discharged into the industrial park sewage treatment plant, ultimately entering the Laodao River Class III water area. 3 Stripping developing waste liquid, non-complex acidic/alkaline copper-containing waste liquid from inner layer production and solder mask printing processes, lamination, through-hole electroplating, solder mask printing, stamping, and testing processes, COD, suspended solids 20, COD, copper 38. Treated by the industrial park sewage treatment plant, ultimately entering the Laodao River Class III water area. 6 Domestic wastewater, COD, office and domestic sewage 80, ammonia nitrogen discharged into the industrial park sewage treatment plant for treatment, ultimately entering the Laodao River Class III water area. 3.1.3.2 Exhaust gas discharge and treatment measures (1) Organized exhaust gas discharge. Organized exhaust gas discharge and control measures are shown in Table 3.1-4. Organized exhaust gas pollutant discharge and control measures. Serial number, exhaust gas type, source, main pollutants, exhaust stack quantity, height (m). Dust from substrate production, lamination, mechanical drilling, stamping processes, particulate matter, central vacuum cleaner (3 units). 4 3 Organic exhaust gas from the lamination hot pressing process, untreated, directly discharged by the induced draft fan, organic exhaust gas 1. 15 Discharged to the roof of the third floor. 3 Acidic exhaust gas from the through-hole electroplating process manual copper deposition line, 1# water curtain purification filter tower, sulfuric acid mist 1. 17 (Alkaline liquid spray de-misting filter) 4 Acidic exhaust gas from the testing process OSP coating, sulfuric acid mist 5. Acidic exhaust gas from the electroplating nickel/gold process manual gold deposition line, 2# water curtain purification filter tower, sulfuric acid mist 1. 25 (Alkaline liquid spray de-misting filter) 6 Cyanide-containing exhaust gas from the electroplating nickel/gold process manual gold deposition line, hydrogen cyanide 7. 8 Acidic exhaust gas, ammonia-containing exhaust gas from the through-hole electroplating process PTH line, inner/outer layer production process alkaline etching line, sulfuric acid mist 3# water curtain purification filter tower (acid liquid spray de-misting filter), ammonia 1. 15 9 10 Acidic through-hole electroplating process one copper line, two copper lines, organic solder mask printing process, text printing process, sulfuric acid mist 4# water curtain purification filter tower (alkaline liquid spray de-misting filter), non-methane total hydrocarbons 1. 17 11 Acidic exhaust gas from the lamination process brown solution line, sulfuric acid mist 12. Organic exhaust gas from the lamination process brown solution line, 5# water curtain purification filter tower, organic exhaust gas 1. 17 (Alkaline liquid spray de-misting filter) 13 Organic exhaust gas from the inner layer production DES line, organic exhaust gas. (2) Unorganized discharge pollutants and their control measures. Unorganized discharge exhaust gas mainly consists of dust generated during substrate production, drilling, and other processes, as well as volatile alkaline etching solution (ammonia water), sulfuric acid, and nitric acid pollutants generated during the storage, loading, and use of volatile raw and auxiliary materials. Noise discharge and treatment measures. The main noise sources of the project and their control measures are detailed in Table 3.1-5. Main noise pollution sources and their control measures process. Pollution source. Discharge method. Prevention and control measures for substrate production. Cutting machine. Continuous. Vibration reduction, sound insulation for inner layer. DES line. Continuous. Vibration reduction, sound insulation for laminating machine. Continuous vibration reduction, sound insulation for pressing machine. Cutting machine. Continuous. Vibration reduction, sound insulation for drilling machine. Continuous. Vibration reduction, sound insulation for mechanical drilling. Drilling machine. Continuous. Vibration reduction, sound insulation for through-hole electroplating. Plating Line Continuous. Vibration reduction, sound insulation for process. Pollution source. Discharge method. Prevention and control measures for through-hole electroplating. Etching line Continuous. Vibration reduction, sound insulation film laminating machine Continuous. Vibration reduction, sound insulation outer layer Exposure Machine Continuous. Vibration reduction, sound insulation developing machine Continuous. Vibration reduction, sound insulation solder mask developing line Continuous. Vibration reduction, sound insulation solder mask printing exposure machine Continuous. Vibration reduction, sound insulation stamping forming Forming machine Continuous. Vibration reduction, sound insulation wastewater treatment plant Water pump Continuous. Vibration reduction, exhaust gas purification device Central dust collector continuous Vibration reduction, sound insulation air compressor room Continuous. Vibration reduction, sound absorption, equipment room sound insulation cooling tower Continuous. Vibration reduction, sound absorption 3.1.3.4 Solid waste discharge and treatment measures The project generates a variety of solid waste, with complex components and a large quantity. Hazardous waste includes various production waste liquids, waste inks, copper-containing sludge, waste semi-cured sheets, etc.; general solid waste includes waste kraft paper, waste scraps, and office and household garbage. The treatment of solid (liquid) waste is shown in Table 3.1-6. Table 3.1-6 Solid (liquid) waste treatment situation Serial number Name Properties Generation amount (t/month) Disposal method Hazardous waste 1 Alkaline etching waste liquid Liquid 100 Originally entrusted to Green East Tai Company for treatment, now 2 Acidic etching waste liquid Liquid 40 Online treatment 3 Potassium permanganate waste liquid Liquid 1 4 Expansion waste liquid Liquid 2 5 Copper deposition waste liquid Liquid 3 6 Nitric acid waste liquid Liquid 3 7 Waste ink Liquid 0.01 Entrusted to Hunan Green East Tai Company for treatment 8 Waste semi-cured sheets Solid 0.5 9 Copper-containing sludge Solid 5 10 Waste lubricating oil Liquid 0.01 11 Cyanide-containing waste liquid Liquid 0.042 Entrusted to Yongxing Xinyu Environmental Nickel Industry Co., Ltd. 12 Nickel-containing waste liquid Liquid 0.5 Treatment General solid waste 13 Waste kraft paper Solid 0.8 14 Copper foil scraps Solid 1.5 Recycled by Hunan Green East Tai Company 15 Waste aluminum sheets Solid 2.5 16 Household garbage Solid 3 Entrusted to the park sanitation station for disposal. Green East Tai Company is officially named Xiangtan Green East Tai Industrial Waste Treatment Co., Ltd., located in Xiangtan Jiuhua Economic Development Zone. The company has a hazardous waste operation license issued by the Hunan Provincial Environmental Protection Department, number: Xianghuan (Hazardous) 16. The environmental impact report for the etching waste liquid recycling system project of Hunan Li'er Circuit Board Co., Ltd. is numbered (006), mainly handling etching waste liquid and PCB waste generated by circuit board enterprises, designed to process 12,000 tons of copper-containing etching waste liquid and 6,000 tons of PCB waste annually. The main waste liquid sources are two circuit board manufacturing companies in the Jiuhua Economic Zone—Quanchuang Technology Co., Ltd. and Dingxin Electronics Co., Ltd. The total pollutant discharge index of Green East Tai Company comes from the Xiangtan Jiuhua Economic Development Zone. In September 2010, Li'er Circuit Board Company signed a waste recycling and treatment contract with Green East Tai Company, entrusting all hazardous waste except nickel-containing waste liquid and cyanide-containing waste liquid to Green East Tai Company for treatment. 3.1.4 Public engineering 3.1.4.1 Water supply The water supply is connected from the municipal DN200 inlet pipe on No. 2 Road in the southern part of the factory area to the circular water supply pipe in the factory area to ensure the needs for production, domestic water, and fire-fighting water, with a daily water supply of 1200m3. To meet the water quality requirements for PCB production, a 600m3/d pure water preparation device is equipped. The pure water preparation uses reverse osmosis membrane technology, with about 220m3/d of reverse osmosis concentrated water reused for cooling equipment and wastewater treatment equipment, as well as for flushing toilets, etc. 3.1.4.2 Drainage Wastewater is generated during the production process, and the wastewater discharged from the factory mainly consists of production wastewater and domestic sewage. The designed average daily drainage volume is about 1040m3, of which the production workshop discharges about 960m3/d of wastewater, and the domestic sewage discharge is about 80m3/d. The annual drainage volume is about 260,000 m3. The internal drainage of the factory adopts a diversion system for rainwater, domestic sewage, and production wastewater. Rainwater is discharged into the industrial park's rainwater pipeline; production wastewater is treated at the factory's sewage treatment station (with a treatment capacity of 1200m3/d) to meet the (GB8978-1996) Class III standard before discharge; domestic sewage is initially treated in a septic tank and then discharged together with the treated production wastewater. The discharged wastewater that meets the standards is further treated at the industrial park's sewage treatment plant before being discharged into the Laodao River. 3.1.4.3 Power supply is provided by the 110KV/10KV substation about 1km from this site, the 10KV power supply line built in the block where the factory is located, and the switching station. Based on the electrical load situation of the entire factory, the low-voltage distribution voltage in the factory area is 0.23/0.4KV, with 0.4KV supplying power to the power load and 0.4/0.23KV supplying power to the lighting load. The installed capacity of the equipment and the total power capacity is about 1200KW. Considering the effective load and equipment utilization rate, a 630KVA transformer is equipped, and a dedicated distribution system is set up. 3.1.4.4 Heating: This project uses air compressors for heating, while employees' living needs are met with natural gas and solar energy. Acceptance Conclusion: Hunan Lier Circuit Board Co., Ltd. was approved by the Hunan Provincial Environmental Protection Department in August 2011 (see acceptance document in the attachment). The main conclusions are as follows: 1. Wastewater: The discharge concentrations of chemical oxygen demand, five-day biochemical oxygen demand, suspended solids, volatile phenols, manganese, ammonia nitrogen, total copper, petroleum, anionic surfactants, cyanides, and nickel in the company's production wastewater treatment station's outlet meet the daily average values and pH range of GB8978-1996 "Comprehensive Discharge Standard for Wastewater" (Table 1), (Table 4 Level 3) standards. The daily average discharge concentration of nickel meets the current standard GB21900-2008 "Pollutant Discharge Standard for Electroplating" (Table 2) requirements. The discharge concentrations of chemical oxygen demand, five-day biochemical oxygen demand, suspended solids, volatile phenols, and animal and vegetable oils in the company's domestic wastewater outlet meet the daily average values and pH range of GB8978-1996 "Comprehensive Discharge Standard for Wastewater" (Table 4 Level 3) standards. Both production wastewater and domestic wastewater are treated at the Liuyang Industrial Park wastewater treatment station after processing. 2. Waste Gas: (1) The maximum monitored concentrations and discharge rates of organized emissions from the outlet of the 1-5# waste gas treatment towers for sulfuric acid mist, hydrogen cyanide, non-methane total hydrocarbons, phenols from the thermal pressing process, and ammonia from the 3# waste gas treatment tower all meet the requirements of GB16297-1996 "Comprehensive Discharge Standard for Air Pollutants" (Table 2), GB21900-2008 "Pollutant Discharge Standard for Electroplating" (Table 5), and GB14554-93 "Odor Pollutant Discharge Standard" (Table 2). (2) The maximum concentrations of particulate matter, sulfuric acid mist, and ammonia in the unorganized emissions at the west, north, and south boundaries of the plant all meet the monitoring concentration limits of GB16297-1996 "Comprehensive Discharge Standard for Air Pollutants" (Table 2) and the requirements of GB14554-93 "Odor Pollutant Discharge Standard" (Table 1) (Level 2). 3. Noise: The daytime and nighttime noise levels at the south, east, north, and west boundaries of the company meet the GB12348-2008 "Environmental Noise Emission Standard for Industrial Enterprises" (Table 1) Level 3 standards. 4. Solid Waste: Hazardous waste includes 8 types of production waste liquid, waste ink, waste semi-cured sheets, copper-containing sludge, waste lubricating oil, etc., which are entrusted to Hunan Lvyidongtai Company and Yongxing Xinyu Environmental Nickel Industry Co., Ltd. for treatment; general solid waste such as waste kraft paper, waste edge scraps, and waste aluminum sheets are recycled and treated by Hunan Lvyidongtai Company; office and domestic waste is handled by the park's sanitation station. 5. Total Control: The total discharge of chemical oxygen demand meets the total control indicators approved in the environmental assessment. Construction Scale and Product Nature: The design capacity, current actual capacity, and product nature of this etching wastewater recycling system project are shown in the table below. Acidic Etching Waste Liquid Recycling System Cathode Copper 37.5 28.2 Purity 98% Recycling System Regenerated Acidic Etching Liquid t/a 480 360 Reused in Acidic Etching Line Alkaline Etching Waste Liquid Recycling System Cathode Copper 106 74 Purity 97% Recycling System Regenerated Alkaline Etching Liquid 1200 840 Reused in Alkaline Etching Line. Currently, due to insufficient production tasks for circuit boards, only about 70% of the original design capacity for circuit board production can be achieved, resulting in the generation of acidic and alkaline waste liquid being about 70% of the designed amount for circuit board production. Therefore, the actual treatment amount of waste liquid is only about 70% of the designed amount of the recycling system. The treated domestic wastewater is discharged together with the industrial wastewater after treatment. Relying on the entire plant's environmental protection Standard discharge into the industrial park wastewater treatment plant, meeting the standards. Noise Treatment Vibration pads, silencers The construction has been completed. Household waste is uniformly collected and treated by the park's sanitation. The acidic workshop has been built with anti-seepage and containment measures, while other production areas have risks such as corrosion and seepage. Ground anti-corrosion, anti-seepage, and containment. The storage and transportation area needs additional construction; liquid ammonia storage area and alkaline waste prevention projects. Liquid ammonia leakage water spraying device. The liquid treatment workshop's liquid ammonia leakage water spraying device needs additional construction for water supply. Water supply volume: 758.6m³/a. Relying on the entire plant's public engineering for power supply and drainage system. Power supply volume: 175000kwh/a. Rainwater and sewage are separated, with rainwater discharged into the rainwater pipeline, and domestic sewage and production wastewater discharged into the company's sewage treatment station through sewage pipelines. Relying on the entire plant's storage and transportation engineering, acidic etching waste liquid is recycled and produced with supporting storage and transportation pipelines. Alkaline etching waste liquid is recycled and produced with supporting storage and transportation pipelines. Waste liquid and hydrochloric acid are transported to the treatment production line's supporting pipeline, and the regenerated liquid is transported back to the etching process pipeline, with regenerated liquid storage tanks. The pipelines have been constructed, and storage tanks have been equipped. Hazardous waste temporary storage. -- Relying on the entire plant's raw material warehouse. -- Completed (on the first floor) 3.2.4. Main equipment 3.2.4.1. Main equipment of the acidic system. The main equipment of the alkaline etching waste liquid recycling system is shown in the table below. Table 3.2-3. Overview of the main equipment of the acidic etching waste liquid recycling system. Serial number. System name. Equipment name. Specifications Unit. Quantity 1. Anionic electrolysis section. Anionic electrolysis tank. 2195*1185*1380mm. pieces. 1 2 Cationic electrolysis section. ACS tank. 2196*1185*1380mm. pieces 1 3. Cationic electrolysis tank. 2195*1185*1380mm. pieces. 1 4 Copper output section. Copper washing tank. 1195*1185*1350mm. pieces. 1 20 Hunan Lier Circuit Board Co., Ltd. Etching Waste Liquid Recycling System Project Environmental Impact Report 5. Drug extraction section. Horizontal acid and alkali resistant pump. -- units. 16 6 Waste gas treatment section. Waste gas treatment tower. ∅1600*2820mm. sets. 1 7 Waste liquid cooling recovery device ∅400*400mm. sets. 1 8 Fiberglass fan. AC380V 5.5KW snail type. units. 1 9 Dissolving absorption tank. 2090*1570*1600mm. pieces. 1 10 Iron chip absorption tank 1625*1575*1524mm. pieces. 1 11 Electric control section. Electric control cabinet. 1600*800*400mm. sets. 1 12 Liquid storage section. Storage barrel. 5000L white PE. pieces. 3 3.2.4.2 Main equipment of the alkaline system. The main equipment of the alkaline etching waste liquid recycling system is shown in the table below. Table 3.2-4. Overview of the main equipment of the alkaline etching waste liquid recycling system. Serial number. System name. Equipment name. Specification Unit. Quantity 1. Electrolysis section. Electrolysis tank. 6000*1200mm. pieces. 2 2 Drug extraction section. Magnetic pump. 0.55kw pieces. 12 3 Waste gas treatment section. Waste gas extraction pipeline. sets. 1 4 Waste gas treatment spraying tower ∅800*1500mm. sets. 1 5 Electric control section. Electric control cabinet. sets. 2 6 Power cabinet. 24V/2500A pieces. 2 7 Liquid storage section. Storage barrel. 3000L white PE. pieces. 8 8 Ice water machine. units. 1 3.2.5 Main raw and auxiliary materials. All raw materials used in the project are sourced domestically, and all raw and auxiliary materials are transported to the factory by truck. Acid and alkali etching waste liquid are pollutants generated from the existing production process in the factory. 3.2.5.1. Main raw and auxiliary materials of the acidic system. Table 3.2-5 Consumption table of main raw and auxiliary materials for the acidic recycling system. Serial Material Number Name Important components, specifications, indicators Annual consumption (t/a) Maximum form, storage storage remarks amount (t). Method Store in the first-floor warehouse, 1. Iron chips. / 10 3 Solid, bagged. Not stored on the production line. Shared etching production 2. Hydrochloric acid 35% 12. 1 Liquid, barrelled. The hydrochloric acid storage tank is located in the southeast corner of the roof, pumped 3 acidic etching waste liquid with a specific gravity of about 1.28 copper ions: 140g/L. 480 Chloride ion: 180-200g/L on-site storage Liquid, barrel packed, 1t 3.2.5.2 Main raw and auxiliary materials of the alkaline system. The consumption of main raw and auxiliary materials in the alkaline regeneration circulation system is detailed in the table below. 21 Hunan Lier Circuit Board Co., Ltd. Etching Waste Liquid Recycling System Project Environmental Impact Report Table 3.2-6 Consumption Table of Main Raw and Auxiliary Materials in Alkaline Regeneration Circulation System No. Material Important Components, Annual Consumption Name Specifications, Indicators (t/a) Maximum Form, Storage Storage Remarks Amount (t) Method 1 Liquid ammonia 400kg/cylinder 2.4 0.4 Liquid, tanked on-site storage amount 400kg 2 Ammonium chloride 50kg/bag 1.2 Solid, bagged 3 Etching additives 25L/barrel 2.4 Liquid, barrel packed 200L/month 4 Alkaline etching Specific gravity about 1.3 Etching waste liquid Cu2+: 130g/L, Cl-: 180g/L 1200 / Liquid, barrel packed on-site storage 6t 3.2.5.3 Main material physicochemical properties The physicochemical properties and toxicological toxicity of the waste liquid and raw and auxiliary materials handled in this project are shown in the table below. Table 3.2-7 Physicochemical properties and toxicological toxicity Name Molecular formula Physicochemical properties Combustion explosiveness Toxicity and toxicology Colorless liquid, corrosive. Has an irritating odor. Concentrated hydrochloric acid is volatile. Melting point 114.8℃, boiling point 108.6℃, relative density 1.20, hydrochloric acid relative vapor density 1.26, saturated HCl Vapor pressure 30.66 kPa (21℃). Can react with some active metal powders, releasing hydrogen. Can produce highly toxic hydrogen cyanide gas when encountering cyanides. Neutralizes with alkalis, releasing a large amount of heat. This product is non-flammable, highly corrosive, and strongly irritating, which can cause burns to the human body. LD50 900mg/kg (rabbit, oral); LC50 3124ppm, 1 hour (rat, inhalation) Black-brown crystalline, powdery also slightly blocky, melting point 306℃, relative density 2.90, boiling point 319℃, relative vapor density (air=1): 5.61. Ferric chloride can be neutralized with hydrochloric acid to form FeCl3 Composition FeCl4− complex ion, can be extracted with ether. It is a general strength oxidant, can oxidize cuprous chloride to copper chloride. Reducing agents such as hydrazine can make ferric chloride into iron coordination compounds. Non-flammable LD50 1872mg/kg (rat, oral) The pure product is an odorless, salty, easily hygroscopic white powder or crystalline particles. Ammonium chloride NH4Cl Molecular weight: 53.49, melting point 520℃, relative density (water=1): 1.53, saturated vapor pressure 0.133kPa, slightly soluble in ethanol, soluble in water, soluble in glycerin, non-flammable, has irritant properties. Begins to significantly volatilize when heated to 100℃.