1.1 Origin of Work
Jiangsu MO opto-electronic material Co., Ltd. (hereinafter referred to as Aimou) is located at No.1 Qinglongshan Branch Road, International Chemical Industry Park, Zhenjiang New Area. It is adjacent to Xinchangyuan Chemical Industry to the south, Qinglongshan Road to the east, Zhenda Railway to the north, and Saifei New Materials to the west. The geographical coordinates are 119 ° 37 ′ 28.10647 ″ E and 32 ° 9 ′ 50.05985 ″ N, covering an area of 41000m2 (61.5 acres), and the planned land type is Class II construction land. IMOO belongs to the C3985 electronic specialized material manufacturing industry, specializing in the production of high-purity gold with independent intellectual property rights
It belongs to the organic compound (MO source) and alkyl aluminum catalyst specialized in the polyolefin/synthetic rubber industry, and is one of the large enterprises in China that can achieve large-scale production of alkyl aluminum and high-purity MO sources. The company's products are divided into two major categories: high-purity metal organic compounds (electronic chemicals) such as
Diethyl Zinc and alkyl aluminum catalysts such as diethyl aluminum chloride. The purity of diethyl zinc products is over 99.9999%.
In order to effectively strengthen the prevention and control of soil pollution and gradually improve the quality of soil environment, the State Council has formulated and released the "Action Plan for Soil Pollution Prevention and Control" (Guo Fa [2016] No. 31), abbreviated as the "Soil Ten Articles". In response to the current soil pollution situation in China, it is pointed out in the "Soil Ten Articles" that "we should strengthen the protection of unpolluted soil and strictly control new soil pollution." Among them, it is "to prevent new pollution from construction land", Starting from 2017, relevant local people's governments should sign soil pollution prevention and control responsibility agreements with key industry enterprises, clarify relevant measures and responsibilities, and make the responsibility agreements publicly available to society Strengthen daily environmental supervision. Each region should determine the list of key soil environment supervision enterprises based on the distribution and pollution emissions of industrial and mining enterprises, implement dynamic updates, and make it public to the public. Enterprises included in the list should conduct soil environment monitoring on their own land every year, and the results should be made public to the public. Relevant environmental protection departments should regularly monitor key supervision enterprises and the surrounding areas of industrial parks, and timely upload data to the national soil environment The information management platform serves as an important basis for environmental law enforcement and risk warning.
As one of the key regulatory enterprises in Zhenjiang City (refer to the "List of Key Soil Pollution Regulatory Units in Zhenjiang City" (Zhenhuan Ban [2021] No. 4), Aimou entrusted Jiangsu Yingtai Testing Technology Co., Ltd. to carry out self monitoring work on its factory area in November 2022. According to the workflow specified in the "Technical Guidelines for Self Monitoring of Soil and Groundwater in Industrial Enterprises" (HJ1209-2021), and based on on-site exploration and investigation, a self monitoring plan for the soil and groundwater in the enterprise plot is prepared. At the same time, self monitoring work is carried out according to the monitoring plan and a self monitoring report is ultimately formed.
2.1 Enterprise name, address, coordinates, etc
Jiangsu MO opto-electronic material Co., Ltd.(hereinafter referred to as Aimou) was registered and established in August 2010, located at No. 1 Qinglongshan Branch Road, International Chemical Industry Park, Zhenjiang New Area. The geographical coordinates are 119 ° 37 ′ 28 ″ E and 32 ° 9 ′ 50 ″ N, covering a total area of 41000m2 (61.5 acres), and the planned land type is Class II construction land. Aimou belongs to the C3985 electronic specialized material manufacturing industry, specializing in the production of high-purity metal organic compounds (MO sources) with independent intellectual property rights and alkyl aluminum catalysts for the polyolefin/synthetic rubber industry. It is one of the large enterprises in China that can achieve large-scale production of alkyl aluminum and high-purity MO sources. The company's products are divided into two major categories: high-purity metal organic compounds (electronic chemicals) such as diethyl zinc and alkyl aluminum catalysts such as diethyl aluminum chloride. The purity of diethyl zinc products is over 99.9999%. At present, the product has been widely used in industries such as polyolefins (Sinopec, PetroChina, coal chemical), synthetic rubber, microelectronics, LED/OLED displays, and new energy batteries.
The industrial park where EMO is located is a cluster area for chemical enterprises. Except for the vacant land on Qinglongshan Road on the east side, all other areas within its four boundaries are chemical enterprises. To the south is Xinchangyuan Chemical, to the west is Saifei New Materials, and to the north is Zhenda Railway, facing Puyuan Chemical, Kaipu Chemical, and Zhengdan Chemical across the road.
4.4 Situation of key locations, facilities and equipment
The main structures in the factory area include Class A factory buildings, hazardous material warehouses, Class D warehouses, Class C warehouses, incinerator equipment areas, substations, etc. The ground in the factory area has been hardened and cofferdams have been set up to collect initial rainwater; At the same time, an emergency pool should be set up to prevent unexpected situations from occurring.
The waste gas of this project mainly includes process waste gas (non condensable waste gas, vacuum exhaust gas) and incineration waste gas. Each production line is equipped with two-stage absorption tanks and liquid nitrogen deep cooling to collect and treat waste gas, which is then discharged into the atmosphere through a newly added exhaust funnel (P2). A total of three sets of waste gas treatment facilities are set up. White oil in the first level absorption tank; The secondary absorption tank is filled with three layers of materials, which are 50% NaOH layer+absorbent felt partition, calcium oxide+absorbent felt partition, and activated carbon+absorbent felt partition from top to bottom. The collection efficiency of "secondary absorption tank+liquid nitrogen deep cooling" is 99%. The incineration gas is finally discharged through a 25m chimney (P3) using a "waste liquid atomization system+fixed bed furnace for primary incineration → secondary combustion in the secondary combustion chamber → tube heat exchanger → quench neutralization tower → dry spraying device+drying tower → bag dust removal system → alkali spray tower → induced draft fan". The solid waste generated in the production process of enterprises mainly includes hazardous waste (incinerator slag, fly ash), household waste, and general solid waste. Hazardous waste is temporarily stored in hazardous waste warehouses and entrusted to Jiangsu Jiexia Environmental Protection Technology Co., Ltd. for disposal and utilization. According to the relevant requirements of the "Technical Guidelines for Self monitoring of Soil and Groundwater in Industrial Enterprises (Trial)" (HJ 1209-2021), survey work is carried out on the premise of understanding the information of various facilities within the enterprise. Conduct a comprehensive investigation and survey of the key objects of concern within the Emo factory area, with the focus on self monitoring of the company's internal environment. Compare the layout plan of the enterprise and investigate the distribution of all facilities on the plot to understand their internal structure, process flow, and main functions. Observe whether the surrounding areas of each facility are
There is a possibility of pollution occurring. Implement relevant records, materials, on-site photos, etc. separately. For those who discover serious pollution situations, timely report to relevant institutions and responsible departments and handle them in a timely manner.3
4.4.1 Site Survey of Class A Factory Buildings
The areas targeted for on-site inspection are mainly Class A Workshop 1 and Class A Workshop 2. The main focus is on whether there is any leakage of materials, whether the ground is hardened, whether there is special maintenance and regular testing, and whether there is a management plan for emergency accidents. The on-site inspection results are shown in Table 4.4-1.
After on-site investigation, it was found that the floors of Class A Factory Building 1 and Class A Factory Building 2 are both cement hardened and impermeable, and the floors are flat. Class A Factory Building 1 has a small amount of leakage traces, and there is no leakage of pipeline valves; The production equipment is regularly maintained by professional personnel, and the company has relevant measures for emergency accidents.
4.4.2 Site Survey of Incinerator Workshop
The area targeted for on-site inspection is mainly the incinerator workshop, which mainly focuses on whether there is any leakage of materials, whether the ground is hardened, whether there is special maintenance and regular testing, and whether there is a management plan for emergency accidents. The on-site inspection results are shown in Table 4.4-2
After on-site inspection, it was found that the floor of the incinerator workshop is hardened with cement for anti-seepage, and the floor is relatively flat with a small amount of leakage traces. There is no leakage of pipeline valves; The production equipment is regularly maintained by professional personnel, and the company has relevant measures for emergency accidents.
4.4.3 Site Survey of Tank Farm
This item mainly investigates the hidden dangers in the storage tank area of the factory area, mainly focusing on whether there is any leakage in the storage tank, whether there is any leakage in the transportation pipeline and pump body, and whether there is a management plan for emergency accidents
After on-site investigation, it was found that the ground of the storage tank area (liquid nitrogen tank) was hardened with concrete. There was no cofferdam built in the tank area, and there was no cracking or damage during the hardening process. The specific situation is shown in Table 4.4-3. The company regularly assigns dedicated personnel to inspect, and has relevant measures for emergency accidents, which may cause soil pollution.
4.4.4 Site inspection of hazardous material warehouses, hazardous waste warehouses, Class C warehouses and other hidden dangers in the factory area
The on-site inspection mainly focuses on hazardous material warehouses, hazardous waste warehouses, Class C warehouses, and empty bottle warehouses, checking for special maintenance, regular testing, and management plans for emergency accidents in buildings such as roofs/coverings, floors, and enclosures. The on-site inspection results are shown in Table 4.4-4.
After on-site inspection, it was found that hazardous material warehouses, hazardous waste warehouses, Class C warehouses, and empty bottle yards have all been equipped with rainproof and ground hardening facilities; The hazardous waste warehouse has diversion ditches and wastewater collection tanks, and solid waste is packaged and classified for treatment. In addition, the company arranges relevant personnel to regularly inspect the ground conditions, and the company has relevant measures for emergency accidents.
4.4.5 Site Survey of Emergency Accident Pool
The on-site inspection focuses on whether the treatment pool in the factory area has undergone anti-seepage and leakage prevention treatment, whether there are special maintenance and regular inspections, and whether there is a management plan for emergency accidents. The on-site inspection results are shown in Table 4.4-5.
Table 4.4-5 Site Survey of Emergency Accident Pool
After on-site inspection, it was found that the emergency accident pool in the factory area is in good condition and free from cracking. The company regularly arranges dedicated personnel for inspection and maintenance, and has relevant measures for emergency accidents.
8. Analysis of monitoring results
8.1 Analysis of Soil Monitoring Results
8.1.1 Soil Environmental Quality Assessment Standards
This survey selected the "Soil Environmental Quality Construction Land Soil Pollution Risk Control Standard (Trial)" (GB36600-
2018) Evaluate the content of detection factors in the soil of the plot. The "Soil Environmental Quality Construction Land Soil Pollution Risk Control Standard (Trial)" (GB36600-2018) was issued by the Ministry of Ecology and Environment of China and the State Administration for Market Regulation on June 22, 2018, and officially implemented on August 1, 2018. This standard divides land use types into two categories based on the exposure of protected objects: ****** land includes residential land (R) in urban construction land according to GB50137, primary and secondary school land (A33), medical and health land (A5), and social welfare facility land (A6) in public management and public service land, as well as community park or children's park land in park green space (G1); The second type of land includes industrial land (M), logistics and warehousing land (W), commercial service industry land (B), road and transportation facilities land (S), public facilities land (U), public management and public service land (A) (excluding A33, A5, A6), as well as green space and square land (G) (excluding community park or children's park land in G1) specified in GB50137. The monitoring plot is for industrial use, therefore, the soil pollutant risk screening standard for this project plot adopts the screening value (Class II land) standard in Table 1 of the "Soil Environmental Quality Construction Land Soil Pollution Risk Control Standard (Trial)" (GB36600-2018). The specific standard values are detailed in Table 8.1-1.
8.1.2 Monitoring results of each point
From December 14th to 15th, 2022, complete the collection and submission of soil samples. A total of 33 samples were collected on site, including 3 parallel samples. A total of 12 monitoring surface samples (0.2m-0.5m) were collected, including BS1, BS2, BS3, BS4, BS5, BS6, BS7, BS8, BS9, BS10, BS11, and BS12. One soil sample was collected at each point; There are 6 soil columnar points with a depth of 6m, namely S0, S1, S2, S3, S4, and S5. Each point collects and monitors 3 soil samples, totaling 18 soil columnar samples. Three on-site parallel samples are set up for inspection. According to the monitoring results, heavy metals such as arsenic, mercury, cadmium, lead, copper, nickel, and zinc have been detected in soil samples, while hexavalent chromium is less than the detection limit; The volatile organic compound dichloromethane has been detected in soil samples; The characteristic pollutant petroleum hydrocarbons (C10-C40) have been detected. The test results are shown in Attachment 2, and the summary of the detection rates of pollutants in soil samples is shown in Table 8.1-2
8.1.3 Analysis of monitoring results
(1) Basic physical and chemical properties test results
total of 33 samples were analyzed for the basic physical and chemical properties of the soil within the plot, with a pH value between 7.33 and 8.06. According to the Technical Guidelines for Environmental Impact Assessment - Soil Environment (Trial) (HJ964-2018), there are no extremely alkaline (pH>9.5) or strongly alkaline (pH: 8.5-9.5) soil samples; 26 alkaline (pH: 7.5-8.5) soil samples, accounting for 78.79%; A total of 7 weakly alkaline (pH: 7.0-7.5) soil samples, accounting for 21.21%; Non acidic soil samples. In summary, the soil samples of our company are generally alkaline.
(2) Heavy metal and inorganic substance detection results
A total of 7 heavy metals were detected, including copper, nickel, lead, cadmium, mercury, arsenic, and zinc, with a detection rate of 100%, all lower than the screening value for the second type of land.
(3) Organic matter detection results
Volatile organic compound dichloromethane has been partially detected, mainly appearing at 3.5-6m of BS4, BS11, S0, S1
In the soil samples collected from S2, S3, S4, and S5, a ******* value of 25.2mg/kg was detected, which did not exceed the limit standard; The detection rate of petroleum hydrocarbons (C10-C40) is 100%, which is lower than the screening value for Class II land use.
8.2 Analysis of Groundwater Monitoring Results
8.2.1 Groundwater Environmental Quality Assessment Standards
Currently, there is no risk-based groundwater risk screening standard in China. The Technical Guidelines for Site Environmental Investigation (HJ 25.1-2019) released by ***** in China stipulate the use of the "Groundwater Quality Standard" (GB/T 14848-2017) as the groundwater screening standard. Therefore, the relevant standard limits in the national standard "Groundwater Quality Standards" (GB/T14848-2017) are prioritized for the evaluation of groundwater environmental quality in this monitoring. The Quality Standard for Groundwater (GB/T14848-2017) was issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and the National Standardization Administration of China on October 14, 2017, and will be implemented soon on May 1, 2018. The new standard has been revised in conjunction with the revised GB 5749-2006 "Sanitary Standards for Drinking Water", the scientific research achievements of the Ministry of Land and Resources in the field of groundwater in the past 20 years, and international research achievements. The number of indicators has been increased, and the water quality monitoring factor indicators have increased from 39 in GB/T 14848-1993 to 93, an increase of 54 items; Adjusted 20 indicator classification limits and directly adopted 19 indicator classification limits; Reduced comprehensive evaluation regulations, making the standards more widely applicable. Based on the quality status of groundwater in China and human health risks, referring to the quality requirements for drinking water, industrial, agricultural and other water uses, and based on the content of each component (excluding pH), groundwater quality is divided into five categories: Class I: groundwater has low chemical composition content and is suitable for various purposes; Class II: Groundwater has a low content of chemical components and is suitable for various purposes; Class III: Groundwater with moderate chemical composition content, based on GB5749-2006, mainly suitable for centralized domestic drinking water sources and industrial and agricultural water use; Class IV: Groundwater has a high content of chemical components, and the quality requirements for agricultural and industrial water use are as follows:
Based on a certain level of human health risk, it is suitable for agricultural and some industrial water use, and can be used as domestic drinking water after appropriate treatment; Class V: Groundwater has a high content of chemical components and is not suitable as a source of drinking water for daily use.
Based on the fact that the monitored land is for industrial use and the future groundwater will not be developed and utilized, the Class IV standard in the "Groundwater Quality Standard" (GB/T 14848-2017) is adopted for the evaluation of groundwater environmental quality in this self monitoring. The specific standard limits are shown in Table 8.2-1.
8.2.2 Monitoring results of each point
In this monitoring, 5 groundwater monitoring wells (including 1 control well) were constructed in the factory area, 5 samples were collected, and 1 parallel sample was set up. According to the monitoring results, multiple indicators in groundwater samples have been detected to varying degrees. The specific results are shown in Annex 2. The summary of the detection rates of pollutants in groundwater samples is shown in Table 8.2-2.
8.2.3 Analysis of monitoring results
A total of 6 groundwater samples were collected within the project site, and the monitoring indicators cover the "Groundwater Quality Standards" (GB/T
35 sensory shapes, general chemical indicators, toxicological indicators, etc. in 14848-2017, 45 items in Table 1 of the "Soil Environmental Quality Construction Land Soil Pollution Risk Control Standard (Trial)" (GB36600-2018), and 23 water quality indicators were detected, including turbidity, pH, dissolved solids, total hardness, chloride, sulfate, permanganate index, ammonia nitrogen, fluoride, nitrate, etc Nitrite, iron, manganese, sodium, aluminum, zinc, copper, nickel, arsenic, iodide, dichloromethane, volatile phenols, and petroleum hydrocarbons; No other indicators were detected or below the detection limit. The detection rate of turbidity, pH, soluble solids, total hardness, chloride, permanganate index, ammonia nitrogen, fluoride, nitrate, sodium, aluminum, zinc, copper, nickel, and arsenic is 100%. Except for the total hardness index in W3 groundwater well exceeding the Class IV water standard, all other indicators meet the Class IV water standard in the "Groundwater Quality Standard" (GB/T 14848-2017). The detection rate of dichloromethane is 83.33%, meeting the Class IV water quality standard; The detection rate of petroleum hydrocarbons, volatile phenols, iodides, iron, manganese, and sulfates is 66.67%, among which the manganese in W0, W1, and W3 groundwater exceeds the Class IV water standard in the "Groundwater Quality Standard" (GB/T 14848-2017), with a 50% exceeding standard; The detection rate of petroleum hydrocarbons and nitrite nitrogen is 33.33%, meeting the Class IV water standard. In this monitoring, groundwater levels in W0, W1, and W3 all exceeded the standard. Among them, W0, W1, and W3 are manganese levels exceeding the standard. W0 is the control point, W1 is the southern area of Class A factory building, and W3 is the vicinity of the accident pool. The surrounding areas of the three groundwater wells are well hardened and there is no leakage. Moreover, W0 is located in the upstream area of groundwater, so it is speculated that the manganese level exceeding the standard may be caused by the high manganese content in the groundwater in the region; In addition, the total hardness index in W3 exceeds the standard by 0.078 times, and the other several points are relatively close to the Class IV water standard. Therefore, it is speculated that the exceeding of this index is also due to the high total hardness of the region. In summary, the internal soil and groundwater conditions of Jiangsu Aimou Optoelectronic Materials Co., Ltd. are generally good, but some indicators of groundwater have exceeded Class IV water conditions. Therefore, it is recommended not to use groundwater in this area as drinking water. At the same time, regular monitoring of soil and groundwater should be carried out in accordance with relevant soil and groundwater standards in the future to determine whether the groundwater exceeds the standard and has expanded.
10 Conclusion and Measures
10.1 Monitoring Conclusion
In the soil and groundwater monitoring within the factory area of Jiangsu Aimou Optoelectronic Materials Co., Ltd., the characteristic pollutants such as petroleum hydrocarbons (C10~C40) and zinc in the soil, as well as the basic 45 items that must be tested in GB36600, did not exceed the soil pollution risk screening value for Class II land in GB36600-2018.
Turbidity, pH, dissolved solids, total hardness, chloride, sulfate, permanganate index 23 indicators, including ammonia nitrogen, fluoride, nitrate, nitrite, iron, manganese, sodium, aluminum, zinc, copper, nickel, arsenic, iodide, dichloromethane, volatile phenols, and petroleum hydrocarbons, have been detected. Among them, the total hardness in W3 underground water wells exceeds the Class IV water quality standard of GB/T14848-2020, and the manganese in W0, W1, and W3 underground water all exceeds the Class IV water quality standard of the "Groundwater Quality Standard" (GB/T 14848-2017), All indicators in other groundwater have not exceeded the groundwater Class IV water standard, which may be due to the overall high level of these indicators in the regional groundwater. In addition, the detection values of characteristic pollutants such as petroleum hydrocarbons C10~C40 are also lower than the screening values for Class II land pollution risk control in Shanghai's construction land.
Therefore, the pollution risk of surface soil and groundwater in the factory area of Jiangsu Aimou Optoelectronic Materials Co., Ltd. is currently within an acceptable range, but groundwater is not recommended for use as drinking water.
10.2 Main measures and reasons to be taken by enterprises in response to monitoring results
(1) Establish and improve a system for identifying and rectifying potential soil pollution hazards
In addition to conducting a comprehensive and systematic investigation of soil pollution hazards every 2-3 years in accordance with the "Guidelines for the Investigation of Soil Pollution Hazards in Key Regulatory Units (Trial)", enterprises should regularly conduct self inspections of key areas and facilities such as production areas, hazardous material warehouses, hazardous waste temporary storage rooms, underground rainwater and sewage pipelines, and pools within the factory area every year, and promptly rectify any discovered pollution hazards, truthfully record the investigation and rectification of hazards, Form archive files for future reference. At the same time, enterprises also need to conduct irregular inspections of hidden dangers based on their own production practices, promptly rectify the identified problems, and form documents for future reference.
(2) Strengthen the management of production activities in production areas
To reduce the risk of soil and groundwater pollution, enterprises should strengthen the management of anti-seepage measures for the ground inside and outside the factory buildings and entrances and exits in the production area. Cracks and damages on the ground should be repaired in a timely manner, and the anti-corrosion layer should be improved.
At the same time, regular special inspections are conducted on the leakage of underground rainwater and sewage pipelines and underground pools within the factory area to prevent secondary pollution of soil and groundwater caused by pollutant leakage and migration.
(3) Strengthen the construction of equipment and facilities to prevent leakage
Enterprises shall design, construct, and install relevant anti-corrosion and leakage prevention facilities and leakage monitoring devices in accordance with the requirements of relevant national standards and regulations, in order to prevent the pollution of soil and groundwater by toxic and harmful substances, including production facilities, storage tanks, underground pipelines, and other facilities that pose a risk of soil and groundwater pollution. The design, construction, and installation of anti-corrosion and leakage prevention facilities and leakage monitoring devices should be archived in a timely manner. If conditions permit, facilities and equipment involving toxic and harmful substances should be designed above ground as much as possible and not directly grounded to reduce the risk of soil and groundwater pollution.
