"Jiangsu Weida Semiconductor Co., Ltd. semiconductor discrete device manufacturing project"

Acceptance of wastewater, exhaust gas and noise environmental protection

On June 16, 2020, Jiangsu Weida Semiconductor Co., Ltd. organized an acceptance meeting for the completion of wastewater, exhaust gas and noise environmental protection of "Jiangsu Weida Semiconductor Co. Ltd. (construction unit), Yangzhou Xingchuang Environmental Technology Co., Ltd. (report preparation unit), Jiangsu Haokai Testing Technology Co. The participants visited the project construction and operation site, listened to the project construction and operation, the acceptance report preparation and acceptance report conclusions and other reports and explanations, after full discussion, the formation of "Jiangsu Weida Semiconductor Co. Opinions are as follows:

I. Basic information of the project construction

1、Construction location, scale, main construction content

Ltd. is located in the Weiyang Economic Development Zone, Ecological Science and Technology Park, Building 8, the first floor and second floor production, the main construction scale, the content of the annual output of 120,000 silicon chips, semiconductor discharge tube chip 60,000 pieces, transient suppression diode chip 60,000 pieces, silicon controlled into 18,000,000 tubes.

2、Construction process and environmental protection approval

In June 2018, Jiangsu Weida Semiconductor Co., Ltd. commissioned Jiangsu Zhihuan Technology Co., Ltd. to prepare the "Jiangsu Weida Semiconductor Co.

Approval (Yang Yu environmental audit [2018] No. 122). The company applied for the emission permit on November 21, 2019, and the emission permit number is 91321003MA1UXW134N001Q.

3、Investment

The project investment of 60 million yuan, including environmental protection investment of 2.19 million. 4, the scope of acceptance

The scope of acceptance is Jiangsu Weida Semiconductor Co., Ltd. "semiconductor discrete device manufacturing project" involving wastewater, waste gas and noise pollution prevention and control facilities.

Second, the project changes

Ltd. "semiconductor discrete device manufacturing project" in the construction process, (1) to further clarify the chemical reagents (SCR chip production) temporarily stored in the raw material library ①, silicon controlled into the tube production materials stored in the raw material library ②. (2) accident emergency pool increased by 43m3.

The above changes (1) in the clear fire, safety conclusion conditions, does not belong to the "major changes". Third, the construction of environmental protection facilities

1、Wastewater:

The wastewater of this project is mainly domestic sewage and production wastewater, domestic sewage is pre-treated by the existing septic tank in Weiyang Economic Development Zone Ecological Science and Technology Park, production wastewater is treated by the plant sewage treatment device and then connected to the municipal sewage network of Xinyi Road.

2、Exhaust gas:

The organized exhaust gas of this project is mainly the SCR chip production exhaust gas and tube production exhaust gas. The organic cleaning exhaust gas, acid and alkaline cleaning exhaust gas, concentrated boron pre organic exhaust gas, passivation organic exhaust gas, etching exhaust gas, debonding exhaust gas in the SCR chip production exhaust gas, pollutants are mainly fluoride, hydrogen chloride, sulfuric acid mist, acetic acid, phosphoric acid mist, nitrogen oxides, ammonia, trichloroethylene, ethanol, phenol, o-dichlorobenzene, tetrachloroethylene, non-methane total by the three-stage lye spraying device treatment through 1# 25m high exhaust pipe; silicon controllable chip production exhaust gas in the screed exhaust gas, development rinsing exhaust gas, pollutants are mainly non-methane, xylene and butyl acetate, after water washing + dry filtration + secondary activated carbon adsorption device treatment through the 2 # 25m high exhaust brief emissions; silicon controllable chip production exhaust gas in the phosphorus pre-gas, pollutants are chlorine gas, after centralized collection through 4 # 25m high exhaust pipe The pollutants are mainly particulate matter and non-methane gas, which are treated by secondary activated carbon adsorption device and then discharged through 3#25m high exhaust pipe. The unorganized exhaust gases of the project are organic exhaust gas from ink erasing, organic exhaust gas from dotting and fume from gluing, sintering and plastic sealing that are not collected by the air collector.

3、Noise

The noise of this project mainly comes from the production auxiliary facilities such as air compressor sets, vacuum pumps, pumps, fans, lifting pumps, etc. After taking effective vibration damping, sound insulation, sound dissipation and other treatment measures, the impact of noise on the environment will be reduced.

4、Other environmental protection facilities (1) Environmental risk prevention facilities

The project sets up an accident pool with a volume of 295m3, equipped with hydrogen leak alarm, ammonia leak alarm and smoke alarm, etc. The company has an emergency supplies store.

(2) Other facilities

The project sets up 100m health protection distance at the boundary of 8# plant, and there are no environmentally sensitive targets within this protection distance.

4、Effect of commissioning of environmental protection facilities

1、Exhaust gas

(1) Organized exhaust gas

The results of the exhaust gas monitoring period from March 30, 2020 to April 02, 2020 show that: ①1# exhaust brief nitrogen oxides, ethanol, acetic acid, phosphoric acid fog were not detected, and the remaining pollutants (sulfuric acid fog, hydrogen chloride, phenol, non-methane total scrip, o-dichlorobenzene, tetrachloroethylene, fluoride) are all in line with the Comprehensive Emission Standards for Air Pollutants (GB 16297-1996) Table 2. The ammonia meets the standard limits in the Emission Standards for Odor Pollutants (GB14554-93), and trichloroethylene meets the standards in the Comprehensive Emission Standards for Air Pollutants (DB31/933-2015).

②2# Exhaust gas butyl acetate and xylene are not detected, and non-methane total warp meets the secondary standard in Table 2 of the "Comprehensive Emission Standards for Air Pollutants" (GB 16297-1996).

③3# exhaust particulate matter is not detected, and the non-methane total is in accordance with the secondary standard in Table 2 of the Comprehensive Emission Standards for Air Pollutants (GB 16297-1996).

④The chlorine gas from 4# exhaust outlet meets the secondary standard in Table 2 of the Comprehensive Emission Standards for Air Pollutants (GB 16297-1996).

(2) Unorganized exhaust gas

The results of exhaust gas monitoring from March 27, 2020 to March 30, 2020 show that: sulfuric acid mist, xylene, hydrogen chloride, phenol, nitrogen oxides, total non-methane warp, o-dichlorobenzene, tetrachloroethylene, fluoride and particulate matter in the exhaust gas of the project at the monitoring points of each plant boundary meet the requirements of Table 2 of the Comprehensive Emission Standards for Air Pollutants (GB 16297-1996). Emission monitoring concentration value requirements; ammonia meets the standard limits specified in the Emission Standards for Odor Pollutants (GB14554-93), trichloroethylene and butyl acetate meet the standards in the Comprehensive Emission Standards for Air Pollutants (DB31/933-2015); the emission concentrations of volatile organic compounds meet the emission control standards for volatile organic compounds from industrial enterprises (DB12/524-2014). 2014) Table 5 disorganized emission monitoring concentration value requirements.

2、Wastewater

The results during the wastewater monitoring period from April 01, 2020 to April 02, 2020 show that:pH, chemical oxygen demand, fluoride and suspended matter emission concentration in the wastewater outlet of the wastewater treatment unit are in line with the tertiary standard in Table 4 of the Comprehensive Wastewater Discharge Standard (GB8978-1996), and the total nitrogen and ammonia nitrogen emission concentrations are in line with the Water Quality Standard for Wastewater Discharge into Urban Sewers (GB/ T31962-2015) Table 1 in the A-class standard.

3、Noise

The noise monitoring results from April 01, 2020 to April 02, 2020 show that the noise from the east, south, west and north sides of the project meets the requirements of Class 3 standard limit value in the Environmental Noise Emission Standard for Industrial Boundary (GB12348-2008).

4、Total amount

The annual emissions of chemical oxygen demand, ammonia nitrogen and total phosphorus in the wastewater of the project are in line with the control index of the wastewater receiver in the EIA of the project; the annual emissions of volatile organic compounds and particulate matter in the project exhaust gas are in line with the total control index in the EIA of the project and its approval.

V. Acceptance conclusion

Ltd. can carry out production in accordance with the requirements of the EIA and its approval, and the wastewater, exhaust gas and noise pollution control facilities operate normally, and the total amount of pollutant emissions meet the requirements of the EIA and its approval. Provisional Measures" (State Environmental Regulations and Environmental Assessment [2017] No. 4) in Article 8 of the acceptance of the situation does not pass.

Ltd. semiconductor discrete device manufacturing project" completed wastewater, waste gas and noise pollution prevention and control facilities acceptance qualified.

Sixth, the follow-up requirements

1, strictly according to the project EIA and approval requirements for production, to ensure that the pollution prevention and control facilities and treatment process in line with the relevant specifications.

2, strengthen environmental management, and effectively implement the operation and maintenance management system of wastewater, waste gas and noise pollution prevention and control facilities, and strengthen the stable operation and maintenance management of wastewater, waste gas and noise pollution prevention and control facilities to ensure that the pollutants are treated and discharged in a stable manner to meet the standards. Effectively implement the measures of "clearing and sewage separation" and "rain and sewage separation"; improve the "three wastes" ledger and other information.

3, according to the standard requirements, to carry out self-monitoring, and do a good job of information disclosure.

4, according to the standard requirements, strengthen the environmental safety risk identification and emergency management, improve the risk prevention measures to ensure effective environmental safety risk prevention.

5, the completion of the construction project to complete the environmental protection acceptance monitoring report and other explanatory matters.