19

2023

-

05

Announcement of Environmental Protection Acceptance upon Completion of Construction Projects

Author:


According to the relevant provisions of the Environmental Impact Assessment Law and the Interim Measures for Public Participation in Environmental Impact Assessment, the relevant content is hereby made public as follows:

entry name Production project of oxime lipid photoinitiator and LCD cleaning agent
project Sichuan Woken Fine Chemical Co., Ltd
Construction location 168 Keta Avenue, Qianfeng District, Guang'an City
Preparation unit of acceptance monitoring report Sichuan Zhongcheng Hanlan Environmental Protection Service Co., Ltd
  • BASIC INFORMATION OF THE PROJECT

This project is a new construction project of Sichuan Woken Fine Chemical Co., Ltd. (hereinafter referred to as "Sichuan Woken Company") in Xinqiao Industrial Park, Guang'an Economic Development Zone. The proposed site for the project is the construction land of a high-tech new material industrialization project approved by Sichuan Woken Company.
The "Environmental Impact Assessment Report on the High tech New Materials Industrialization Construction Project of Sichuan Woken Fine Chemical Co., Ltd." was approved by the former Guang'an Environmental Protection Bureau in November 2018 (Guanghuan Approval [2018] No. 32), proposing to produce 500t/a photoresist material [1- (9,9-diethyl-2-fluorenyl) -2-hydroxyiminopropan-1-one (M47D)] and 500t/a ultraviolet absorber material [bis ethylhexoxyphenol methoxyphenyltriazine (D55D)], However, due to various reasons, the preliminary work was not completed. Therefore, Sichuan Woken Company has decided to first build more mature production projects of 1- [4- (phenylthio) phenyl] -1,2-octanedione 2- (O-benzoyloxime) (M58), 1- (9,9-diethyl-9H-2-fluorenyl) -2-acetoxyiminopropane 1-one (M60), and 2-mercapto-1-methylimidazole (D30).
This project plans to produce 70t/a oxime ester photoinitiators (40t/a M58, 30t/a M60) and 30t/a LCD cleaning agent (D30), belonging to the electronic chemical industry category in the new material industry system, with a total production scale of 100t/a. Compared with the projects approved by Guanghuan Approval [2018] No. 32, this project belongs to the small-scale fine chemical industry. Except for a decrease in total production capacity, the main facilities such as chemical synthesis production lines, public auxiliary facilities, environmental protection and safety facilities are mostly the same as the old project. Most of the content involved in the environmental impact assessment report of the original old project will be constructed first in this project.

2、 Environmental protection implementation status
(1) Environmental management

According to national laws and regulations on environmental protection, the project has undergone an environmental impact assessment and completed the environmental impact approval procedures for the construction project. The corresponding environmental protection facilities of the project are designed, constructed, and put into use simultaneously with the main project. The environmental approval procedures and environmental protection archives for this project are complete, and environmental management rules and regulations have been established. The environmental management of this project basically meets the requirements.

(2) Main pollution prevention and control measures and ecological environment protection measures
Ecological and environmental protection measures:
During the construction period, dust, noise, construction debris, and construction wastewater are generated, affecting the air, sound, surface water, and ecological environment. Adopt the following management and engineering measures.

Management measures:Incorporate environmental protection work during the construction period into contract management, clarify that the construction unit is the responsible party for environmental protection work, and the owner unit is the supervisory and management party; And require the construction unit to incorporate the implementation of environmental protection measures into the production management system and establish corresponding work systems; At the same time, strengthen the environmental protection publicity work for the construction team。

Engineering measures:

1) Dust prevention: ① Regularly sprinkle water to reduce dust, and install dust nets at main dust production points; ② Timely remove road dust; ③ Hardening treatment shall be carried out at the entrance and exit intersections, and transportation vehicles shall be equipped with soil cleaning and vehicle cleaning facilities; ④ All vehicles transporting construction waste and building materials are transported in a sealed manner.
2) Noise prevention and control: The concrete mixing and other operation points should be as far away from the factory boundary as possible.
3) Disposal of construction waste: ① The waste should be promptly cleaned and transported to the designated construction waste storage site according to the requirements of the local environmental sanitation department; ② Temporary stacking should avoid ditches and cover the stacking.
4) Wastewater: Build a simple sedimentation basin at the discharge point of construction wastewater, and reuse the construction wastewater. The domestic sewage generated during the construction period is collected by the existing domestic sewage facilities in the park, and then sent to the wastewater station in the park for treatment through pipelines. After reaching the standard, it is discharged into the sewage receiving river.
5) Ecological restoration and soil and water conservation measures: ① Pay attention to protecting vegetation during construction, and promptly replant and restore damaged vegetation; ② Timely cleaning and transportation of construction debris; ③ Timely restoration of construction sites within the site.

Waste gas treatment measures:The organized emission of waste gas from the project includes 38 process waste gases and 3 secondary waste gases generated during the operation of environmental protection and treatment facilities. The total amount of pollutants generated from process waste gas is 230t/a, with solvent distillation as the main method for recovering non condensable gas. Especially, the non condensable gas generated from dichloromethane recovery, which has the highest usage in the project, reaches 133.3t/a, accounting for 58%. The governance measures adopted by the project are as follows:
1) According to the characteristics of the project process waste gas, it is divided into halogenated hydrocarbon organic waste gas and general organic waste gas, which are treated by resin adsorption and incineration respectively. Other waste gas treatment measures include the collection of waste gas in the hazardous waste room with activated carbon fiber adsorption, and the treatment of product drying and packaging dust with a bag filter.
2) The project incinerator is used for incineration and disposal of waste liquid, solid waste, and crude salt purification. At the same time, the secondary combustion chamber of the incinerator is also a terminal measure for incineration and treatment of general organic waste gas. The treatment measures for incineration waste gas include "secondary combustion chamber (temperature ≥ 1200 ℃, residence time ≥ 2S)+SNCR denitrification+rapid cooling+dry reaction gas (spraying activated carbon to adsorb heavy metals and dioxins, spraying hydrated lime for acid removal)+bag dust removal+alkali scattering desulfurizer+wet electric dust removal" treatment technology.
The project incinerator flue gas adopts strict control measures for dioxin pollutants in accordance with the "Hazardous Waste Incineration Pollutant Control Standard" (GB18484-2001): ① The combustion temperature of the secondary combustion chamber reaches 1200 ℃, and the flue gas remains for 2 seconds, ensuring that the incineration rate of various organic components reaches over 99.9%. While removing dioxins, the precursor components that may exist in dioxin regeneration are also basically eliminated from the source; ② Using rapid cooling technology to quickly reduce the flue gas temperature (within 1 second) from around 900 ℃ to 200 ℃, resulting in a short residence time and inability to regenerate the flue gas in the temperature range where dioxins are easily regenerated (300-400 ℃); ③ Spray activated carbon into the dry reactor to adsorb residual trace amounts of dioxin pollutants.

Wastewater treatment measures include:Overall requirements for wastewater treatment
The project adopts various measures to implement the method of "multiple uses and reuse of one water". Production water circulation pipelines and rainwater discharge pipelines are respectively built in the factory to achieve "separation of clean water and wastewater" and avoid rainwater mixing into the sewage pipeline network or production wastewater mixing into the rainwater pipeline network for discharge.

Construction of main wastewater treatment facilities in the factory area

① Build a pre-treatment device for high concentration saline wastewater in the wastewater station, including a neutralization regulation tank, an evaporation concentration kettle, and a collection tank for sewage and cold water. The processing capacity is 2t/d.
② Build one production wastewater station with a total designed treatment capacity of 400t/d, and this time construct a treatment capacity of 100t/d first. The main process is "iron carbon micro electrolysis → Fenton oxidation → coagulation sedimentation → comprehensive regulation → anaerobic UASB → two-stage A/O → secondary sedimentation tank → reaction sedimentation" (see 2.2.3.2 for the specific process). The effluent meets the requirements of the third level standard in the "Comprehensive Wastewater Discharge Standard" (GB8978-1996) and is discharged into the sewage treatment plant of Xinqiao Industrial Park, After the final treatment meets the Class A standard of the "Pollutant Discharge Standard for Urban Sewage Treatment Plants" (GB18918-2002), it will be discharged. The process from micro electrolysis to aerobic biochemical treatment adopted by the project wastewater station is the best feasible technology for achieving the standard of high concentration wastewater treatment. It is suitable for treating wastewater ranging from 10000 to 20000 mg/L to reach the standard of 50mg/L. However, the COD control standard for the effluent of this project is 500mg/L. Therefore, using this treatment technology is easier to meet the project factory standard.
Based on the experience of wastewater treatment in relevant industries and enterprises both domestically and internationally, as well as the theoretical principles of wastewater treatment design, the "physicochemical+biochemical" wastewater treatment scheme adopted in this project is mature and feasible in terms of process technology and theoretical principles, with many successful engineering examples. The measures are feasible.
It should be noted that the circulating sewage and desalinated water station drainage generated by the project, due to their simple composition, do not need to be sent to the project wastewater station for treatment. They are directly sent to the Xinqiao Industrial Park Wastewater Treatment Plant for treatment through the main sewage outlet of the plant.

Noise treatment measures:Types of noise and control measures
The main noise sources of this project include various fans, pumps, air compressors, and spinning devices. Mainly through the following measures for governance:
1) Try to choose low noise equipment;
2) Equipment with strong noise shall be equipped with soundproof covers and silencers, and operation positions shall be equipped with soundproof rooms;
3) The vibration equipment adopts flexible connections and is equipped with shock absorbers or shock absorbers;
4) For compressors, pumps, and other equipment installed indoors, sound insulation arrangements in the factory are adopted;
5) Pay attention to vibration and impact prevention in pipeline design to reduce material falling and vibration noise. Attention should be paid to improving the smoothness of air ducts and fluid transportation to reduce aerodynamic noise.
6) Through the overall layout, reasonable layout, prevention of noise superposition and interference, and distance attenuation, the factory boundary meets the standard.

Solid waste disposal measures include:Temporary storage and pollution prevention measures for project waste liquid/solid waste in the factory
Due to the involvement of general and hazardous solid waste in project production, they need to be classified and stored according to their nature. Hazardous waste temporary storage rooms and general solid waste temporary storage rooms should be set up in the factory area.

The factory area will set up a dedicated hazardous waste temporary storage room, which should strictly comply with the "Pollution Control Standards for Hazardous Waste Storage" (GB 18597-2001). The main construction requirements are as follows:

① The ground and skirt should be constructed with sturdy and impermeable materials, and the building materials must be compatible with hazardous waste; ② The temporary storage of hazardous waste in the project must have a leakage liquid collection device; ③ There should be safety lighting facilities and observation windows in the temporary storage warehouse; ④ The temporary storage of hazardous waste must have a corrosion-resistant hardened ground with no cracks on the surface, and the impermeable layer must have a permeability coefficient of at least 1 × 1.0m natural clay with a permeability coefficient of 10-7cm/s, or 2mm artificial material with a permeability coefficient less than 10-10cm/s; ⑤ Skirts should be designed to intercept leaks, and the volume enclosed by the ground and skirt should not be less than the maximum storage capacity or one-fifth of the total storage capacity of the largest container to be intercepted; ⑥ Incompatible hazardous waste must be stored separately and separated by isolation compartments; ⑦ The top of the hazardous waste warehouse should be covered with a canopy, and a fence or other protective fence should be set up around the hazardous waste storage facilities. A cofferdam must be set up around the reservoir, a diversion ditch must be built inside the reservoir, and a rainwater ditch must be built outside the reservoir. Measures should be taken to prevent rain, wind, sun, corrosion, and leakage; ⑧ Hazardous waste storage facilities must be equipped with warning signs in accordance with GB15562.2, communication equipment, lighting facilities, safety protective clothing and tools, and emergency protection facilities; ⑨ Monitor hazardous waste storage facilities in accordance with national pollution source management requirements.
In summary, all measures for the temporary storage of hazardous waste in the project should be strictly constructed in accordance with the "Pollution Control Standards for Hazardous Waste Storage" (GB 18597-2001). A temporary storage warehouse for general solid waste will be built in the factory area, which must be constructed in accordance with the "Pollution Control Standards for General Industrial Solid Waste Storage and Disposal Sites" (GB18599-2001).

3、 Monitoring results

The project underwent acceptance monitoring from May 5-16, 2023, and the monitoring points, including atmosphere, water, noise, and soil, met the requirements of the completion acceptance standards.

4、 Conclusion of on-site inspection

Through on-site inspection by the acceptance team, it was found that Sichuan Woken Fine Chemical Co., Ltd. has implemented an environmental impact assessment system and a "three simultaneities" system for the oxime ester photoinitiator (40t/a M58, 30t/a M60) and 30 t/a LCD cleaning agent project. There is a relatively complete environmental management system, and the requirements for environmental assessment reports and approval documents have been implemented in the design, construction, and trial operation. Ecological and environmental protection measures and pollution prevention measures are effective, There are no significant environmental impact issues, and the project construction will not have a significant adverse impact on the surrounding environment. The project basically meets the acceptance requirements and is agreed to pass the acceptance in principle.

 

 

From now on, the public can consult our company for relevant information and provide relevant opinions and suggestions by phone, letter, email or other means within 10 days.
Contact number: 0826-8985980

 

Email: 3189108382@qq.com
Contact address: No. 168 Keta Avenue, Qianfeng District, Guang'an City
Postal Code: 638500

 

Sichuan Woken Fine Chemical Co., Ltd

May 17, 2023