Entrusted unit: Tangshan Jiecheng Hazardous Waste Treatment Co., LTD

Compiled by: Hebei Institute of Technology Cloud Environment Testing Technology Co., LTD

November 2022

1 Work background

Soil is the material basis for sustainable economic and social development, and is related to the health of the people and the construction of a beautiful China. Protecting the soil environment is an important part of promoting ecological civilization construction and safeguarding national ecological security. At present, the overall condition of China's soil environment is worrying, and some areas are more seriously polluted, which has become one of the outstanding shortcomings of building a well-off society in an all-round way. In accordance with the requirements of the Notice of The State Council on Issuing and Distributing the Action Plan for Soil Pollution Prevention and Control (Guofa [2016] No. 31), the Ministry of Ecology and Environment, together with the relevant departments of The State Council, formulated the Provisions on the Evaluation and Assessment of the Implementation of the Action Plan for Soil Pollution Prevention and Control (Trial) (Huansoil [2018] No. 41) (hereinafter referred to as the "Assessment Provisions"). The assessment provisions will focus on the supervision of the soil environment self-monitoring report and other public information as one of the assessment indicators. Notice of Hebei Provincial Department of Ecology and Environment on Printing and Distributing 2021 Technical Guidelines for Soil and Groundwater Self-Monitoring by Key Supervision Units of Soil Pollution in Hebei Province (Trial) ([2021] No. 227), clarifying that key supervision units of soil pollution in Hebei Province shall carry out soil and groundwater monitoring in accordance with relevant norms and requirements. The monitoring data shall be reported to the local ecological and environmental authorities and disclosed to the public.

Notice on Strengthening Environmental Management of Key Soil Pollution Supervision Units issued by Tangshan Ecological Environment Bureau on March 11, 2022 (Tang Huantu [2022] No. 1), Clarify the annual self-monitoring work of key soil pollution supervision units in accordance with the requirements of the "Technical Guide for Self-Monitoring of Soil and Groundwater for Industrial Enterprises (Trial)" (HJ1209-2021), to carry out soil and groundwater self-monitoring work, in accordance with the requirements of the Notice, 2021 has prepared a monitoring plan and completed self-monitoring enterprises, This year, the monitoring program can no longer be re-prepared, but it is still necessary to adjust the monitoring requirements and monitoring frequency of the guidelines, and carry out monitoring in accordance with the clear distribution and sampling principles of the latest monitoring program, and the key soil environmental supervision units will disclose their monitoring results to the public according to law. Each county (city, district) ecological environment sub-bureau is responsible for reporting the public screenshots of enterprises under its jurisdiction to the municipal Ecological Environment Bureau.

In July 2022, Tangshan Jiecheng Hazardous Waste Treatment Co., Ltd. entrusted our unit to carry out the soil environment self-monitoring work of its enterprise land. Our company conducted on-site sampling twice from July 27 to August 4, 2022 and from September 26 to September 29, 2022. All samples were collected and sent to the laboratory for testing and analysis. After obtaining the test report, According to the relevant data, the "Tangshan Jiecheng Hazardous Waste Treatment Co., LTD. 2022 Annual soil and groundwater self-monitoring Report" (submitted version) was compiled, and an expert review meeting was held on October 31, 2022, and expert opinions were formed. After modification and improvement, the "Tangshan Jiecheng Hazardous Waste Treatment Co., Ltd. 2022 annual soil and groundwater self-monitoring Report" was completed (for approval).

2 Company Profile

The basic information of Tangshan Jiecheng Hazardous Waste Treatment Co., Ltd. is shown in Table 2.1-1.

 

Table 2.1-1 Basic enterprise information

 

No.	Information item	Details
1	Enterprise name	Tangshan Jiecheng dangerous waste treatment Co., LTD
2	Geographical position	Jianzigu Village, Jianzigu Township, Fengnan District, Tangshan City, Hebei Province
3	Enterprise scale	Minor
4	Plot area（m2）	80611.00
5	Site center coordinates	39°23 '14 "N, 118°04' 03" E
6	Land use history	Before the construction of the factory began in 2015, it was a wasteland, from 2015 to 2019, it was a construction period, and from 2019 to now it is Tangshan Jiecheng Hazardous Waste Treatment Co., LTD
7	Planned land use	Industrial land
8	Industry type	7724 Hazardous waste management

 

 

3 Identification and classification of key monitoring units

The plot is divided into 13 key units based on their functionality. They are numbered as A incineration workshop, B curing workshop, C physical and chemical workshop, D wastewater treatment area, E waste liquid tank area, F hazardous waste storage, G Phase I landfill, H inorganic waste temporary storage, J organic waste temporary storage, K A B class temporary storage, L Phase II landfill, M comprehensive tank, N regulation tank.

4 Conclusions and measures

4.1 Conclusion

Tangshan Jiecheng Hazardous Waste Treatment Co., Ltd. is located in Jianzigu Village, Jianzigu Township, Fengnan District, Tangshan City, Hebei Province. The industry category is 7724 hazardous waste treatment. This year's self-monitoring work is carried out in accordance with the monitoring requirements, monitoring frequency, distribution requirements, sampling principles and other contents in the Technical Guide for Self-Monitoring of Soil and Groundwater for Industrial Enterprises (Trial) (HJ 1209-2021).

4.1.1 Soil monitoring conclusions

A total of 16 soil sampling sites were arranged in the soil sample plot, and 16 soil samples were submitted for testing (excluding parallel samples). The test items in the local block were hexvalent chromium, arsenic, copper, zinc, nickel, mercury, cadmium, lead, pH, dioxins, chromium, fluoride, antimony, tin, petroleum hydrocarbons, VOCs, SVOCs. Through comparison and analysis with standard screening values, background values and monitoring values in recent three years, the overall conclusion is as follows:

Analysis of the test results: Copper, nickel, lead, cadmium, arsenic, mercury, antimony, petroleum hydrocarbons, isophorone, dimethyl phthalate, bis (2-ethylhexyl) phthalate, dioxins were detected, but did not exceed the "Soil Pollution Risk Control Standard for Soil Environmental Quality Construction Land (Trial)" (GB 36600-2018) in the second type of land screening value standard; Zinc, tin and fluoride were detected, but did not exceed the second type of land screening value standard in the "Soil Pollution Risk Screening Value of Construction Land" (DB13 /T 5216-2020); Chromium and manganese were detected, but did not exceed the second type of land screening value standard in the screening value and Control Value of soil pollution Risk of Construction Land (DB4403/T 67-2020); pH has no screening value standard, so it is not evaluated; Other factors are not detected.

Compared with the background point, the detection results of dioxins and dimethyl phthalate samples were relatively higher, and there was little difference in other detection factors. The concentration of dioxin samples did not exceed the screening value (18000mg/kg) of the second class land in the "Soil Pollution Risk Control Standard for Soil Environmental Quality Construction Land (Trial)" (GB 36600-2018).

Analysis of historical data: The average values of heavy metals such as isophorone and dimethyl phthalate in soil showed an upward trend in the whole range, but the increase was not large. The concentrations of cadmium, arsenic, tin, fluoride and petroleum hydrocarbons remained consistent with those of previous years, while the overall monitoring values of other monitoring factors decreased. In 2022, the concentration of monitoring factors in soil did not exceed the corresponding screening values.

The plant was put into operation in 2019, the production time is short, and the process is more advanced. The pollutants in the flue gas of the incinerator mainly include particulate matter, SO2, NOx, CO, HCl, HF, heavy metals and dioxins. The process of "waste heat boiler +SNCR denitration + quench tower + dry deacidification + activated carbon adsorption + bag dust removal + spray absorption tower deacidification + flue gas whitening" is purified and discharged through 45m exhaust tube. The incinerator adopts the principle of 3T+1E to fully incinerate the flue gas and increase the temperature of the secondary combustion chamber. The temperature in the secondary combustion chamber is always maintained above 1100 ° C, and the residence time of the flue gas in the secondary combustion chamber will be greater than 2s. Under this condition, more than 99.99% of the dioxins and other harmful components in the flue gas will be decomposed.

In 2020 and 2021, the dioxin class exceeded the standard near the incineration workshop, mainly for the following reasons: the construction period of the enterprise was late, and its east side (upwind) was close to the Tangshan Jiecheng Energy Co., Ltd. domestic waste incineration plant, and the dioxin in the soil was likely to produce a certain amount of accumulation under the influence of surrounding enterprises.

4.1.2 Conclusion of groundwater monitoring

This year, 15 groundwater sampling points (including 1 background point) were set in the enterprise, and a total of 17 groups of samples (including 2 parallel samples) were collected. The monitoring factors were chromium vi, arsenic, copper, zinc, nickel, mercury, cadmium, lead, pH, total chromium, fluoride, manganese, sodium, chloride, total hardness, total dissolved solids, ammonia nitrogen, volatile phenol, benzene, toluene, xylene, antimony, tin, petroleum, sulfide, beryllium, barium; A total of 15 groundwater sampling points (including 1 background point) were set for the second groundwater sampling in this year, and a total of 17 groups of samples (including 2 parallel samples) were collected, with the same monitoring factors as the first one. Through comparison and analysis with standard values, background points and historical monitoring values, the overall conclusion is as follows:

1. Comparative analysis with evaluation criteria

According to the first test data, a total of 18 factors were detected in 14 groundwater monitoring Wells in the company, among which the detected concentrations of pH, sodium, chromium, nickel, copper, zinc, tin, antimony, barium, mercury, ammonia nitrogen and fluoride did not exceed the GB/T 14848-2017 Class III standard; Manganese, Cl-, SO42-, total hardness, ammonia nitrogen, dissolved total solids exceeded GB/T 14848-2017 Class III standard, exceeding the rate of 42.86%, 57.14%, 14.29%, 78.57%, 50.00%, 57.14%. Other factors were not detected.

According to the second test data, a total of 16 factors were detected in 14 groundwater monitoring Wells in the company, among which the detected concentrations of pH, sodium, chromium, nickel, copper, zinc, barium, ammonia nitrogen, fluoride and volatile phenol did not exceed the GB/T 14848-2017 Class III standard; Manganese, Cl-, SO42-, total hardness, ammonia nitrogen, dissolved total solids exceeded GB/T 14848-2017 Class III standard, exceeding the rate of 42.86%, 57.14%, 14.29%, 78.57%, 50.00%. Other factors were not detected.

The high content of total hardness, total dissolved solids and chloride is mainly due to the fact that the project is located in the coastal plain, shallow groundwater burial, large evaporation, and very slow runoff rate, resulting in the accumulation of salt and minerals. Ammonia nitrogen, manganese, sulfate, sodium generally exceed the standard phenomenon, although these factors are also concerned by the enterprise pollutants, but due to the uncertainty of the self-monitoring distribution and the special hydrogeological environment of the enterprise in the coastal plain and other factors, it can not be determined whether the excessive phenomenon is related to the production of the enterprise.

2. Comparative analysis with background detection value

According to the comparative analysis between the first test data and the background test value, the detected concentration of characteristic factor pH in the enterprise is consistent with that of the background point. The detected concentration of chromium, manganese, nickel, copper, zinc, tin, antimony, barium and mercury in the enterprise is higher than that of the background point, but the detected value is far lower than the selected standard value. It shows that the production activities of enterprises have caused a certain impact on groundwater.

According to the comparative analysis of the second detection data and the background detection value, the concentration level of the characteristic factor pH detected in the enterprise is consistent with that of the background point. The detected values of chromium, manganese, nickel, copper, zinc, tin, antimony, barium and lead in the enterprise are higher than the background point, but the detected values are far lower than the selected standard values, indicating that the production activities of the enterprise have caused a certain impact on groundwater.

3, monitoring value and historical detection value change trend analysis

(1) The comparison between the latest monitoring value and the last monitoring value

The increase values of copper and zinc in BS1, copper in CS1, copper in FS1, nickel, zinc and barium in MS1 are more than 30% higher than the previous monitoring value at this point, so the monitoring frequency of BS1, CS1, FS1 and MS1 should be increased by at least 1 times, until the following conditions no longer occur in the monitoring results for at least two consecutive times, the original monitoring frequency can be restored.

(2) Analysis of the change trend of monitoring value and historical detection value

The zinc concentration in groundwater monitoring well AS1 showed an increasing trend. The concentration of hexavalent chromium is basically stable. The concentration of other detected factors showed a decreasing trend.

The concentration of chromium, barium, copper, zinc, sodium, total dissolved solids, total hardness and ammonia nitrogen in groundwater monitoring well BS1 showed an increasing trend. The concentrations of manganese, nickel, arsenic, antimony, mercury, hexavalent chromium, sulfide, fluoride and chloride showed a decreasing trend. The concentration of chromium hexavalent and sulfide is basically stable.

Manganese, barium, nickel, zinc, total hardness and chloride concentration in groundwater monitoring well CS1 showed an increasing trend. The concentrations of chromium, arsenic, mercury, copper, antimony, sodium, dissolved total solids, ammonia nitrogen and fluoride showed a decreasing trend. The concentration of hexavalent chromium is basically stable.

The concentration of manganese, barium, sodium, copper, total hardness and chloride in groundwater monitoring well DS1 showed an increasing trend. The concentrations of nickel, arsenic, zinc, antimony, mercury, fluoride, total dissolved solids and ammonia nitrogen showed a decreasing trend. The concentration of hexavalent chromium is basically stable.

The concentrations of barium, copper and chloride in groundwater monitoring well ES1 showed an upward trend. The concentration of chromium, manganese, arsenic, antimony, mercury, sodium, fluoride, ammonia nitrogen, dissolved solids and total hardness showed a decreasing trend. The concentrations of nickel, sulfide and hexavalent chromium are basically stable.

The concentrations of manganese, nickel, barium and zinc in groundwater monitoring well FS1 showed an increasing trend. The concentration of chromium, arsenic, copper, antimony, mercury, hexavalent chromium, sulfide, sodium, fluoride, ammonia nitrogen, chloride, dissolved solids and total hardness showed a decreasing trend. The concentration of chromium vi and sulfide is basically stable.

The concentrations of manganese, barium, copper and chloride in groundwater monitoring well GS1 showed an upward trend. The concentration of chromium, arsenic, copper, antimony, mercury, hexavalent chromium, sulfide, sodium, fluoride, ammonia nitrogen, chloride, dissolved solids and total hardness showed a decreasing trend. The concentration of chromium vi and sulfide is basically stable.

The concentrations of zinc, sodium, fluoride, chloride and dissolved solids in groundwater monitoring well HS1 showed an increasing trend. The concentration of chromium, manganese, nickel, arsenic, barium, copper, antimony, mercury, hexavalent chromium, ammonia nitrogen and total hardness showed a decreasing trend. The concentration of sulfide is basically stable.

The concentrations of chromium, barium, copper, sodium and ammonia nitrogen in groundwater monitoring well JS1 showed an increasing trend. The concentration of manganese, arsenic, antimony, mercury, fluoride, chloride, total dissolved solids and total hardness showed a decreasing trend. The concentration of hexavalent chromium is basically stable.

The concentration of manganese, nickel, barium, zinc, sodium, chloride and total hardness in groundwater monitoring well KS1 showed an increasing trend. The concentration of chromium, arsenic, copper, antimony, mercury, fluoride, ammonia nitrogen and total dissolved solids showed a decreasing trend. The concentration of chromium vi and sulfide is basically stable.

The concentrations of chromium, nickel, barium, copper, sodium, chloride, total dissolved solids and total hardness in groundwater monitoring well LS1 showed an increasing trend. The concentrations of manganese, cadmium, arsenic, zinc, antimony, mercury, hexavalent chromium, ammonia nitrogen and fluoride showed a decreasing trend. The concentration of sulfide is basically stable.

The concentrations of nickel, barium, zinc and sodium in LS2 of the groundwater monitoring well show an increasing trend. The concentration of chromium, manganese, cadmium, arsenic, copper, antimony, mercury, sodium, fluoride, ammonia nitrogen, chloride, dissolved solids and total hardness showed a decreasing trend. The concentration of hexavalent chromium is basically stable.

The concentrations of manganese, nickel, barium, copper, zinc, fluoride, chloride, dissolved solids and total hardness in groundwater monitoring well M02 showed an increasing trend. The concentration of chromium, cadmium, arsenic, antimony, mercury, hexavalent chromium, sodium and ammonia nitrogen showed a decreasing trend. The concentration of sulfide is basically stable.

The concentration of manganese, nickel, barium, zinc and total hardness in groundwater monitoring well NS1 showed an increasing trend. The concentration of manganese, cadmium, arsenic, copper, antimony, mercury, hexavalent chromium, sodium, fluoride, ammonia nitrogen, chloride and total dissolved solids showed a decreasing trend. The concentration of sulfide is basically stable.

10.1.3 Uncertainty analysis

1. In the local block, pollutants such as sulfate, ammonia nitrogen, fluoride and other factors are also affected by the geological background of the region where the block is located. There are uncertainties in the cumulative and trend analysis based solely on the test results, and it is difficult to determine whether the rise and fall of the cumulative results and trend are influenced by a single factor;

2. Based on the detection results of water in the mainland of the plot, the accumulation phenomenon of some characteristic pollutants exists in each monitoring unit simply based on the detection data. However, because the detection limits of each detection index and the detected data (especially the heavy metal index is the most obvious) are very small, small data fluctuations will also cause the cumulative effect on the data. Therefore, it is not certain that the production of enterprises has had an impact on the inland water of the plot, but it should still be given proper attention.

4.2 Main measures to be taken based on monitoring results and reasons

Combined with the detection values of relevant detection items in the survey results of this key industry, on the basis of comparing the relevant detection values in the enterprise self-testing reports in 2020 and 2021, the detection values of individual factors are relatively high, or the enrichment of factors in soil and groundwater is significantly increased. The following rectification measures are proposed for Tangshan Jiecheng Hazardous Waste Treatment Co., LTD. :

(1) In strict accordance with the investigation system in the soil hidden danger investigation report, the hazardous waste storage workshop, incineration treatment workshop, solidification/stabilization

Check key areas such as chemical workshops, physical and chemical workshops, and landfill areas, and timely deal with problems to avoid potential soil and groundwater pollution;

(2) Strengthen the long-term detection of soil and groundwater, and pay attention to the changes in the content of detected substances in the soil and groundwater in the plot. The hazardous waste disposal qualification of the enterprise includes some wastes that have not been collected and disposed of since production, and the relevant indicators are not included in the annual pollutants of concern this time. The follow-up monitoring work should be based on the changes in the types of hazardous waste received and disposed of by the enterprise. Re-demonstrate the types of annual pollutants of concern and monitoring indicators, and adjust them in time;

(3) Strengthen the management measures for hazardous waste in the transportation and transfer process during the production process to prevent materials from migrating into the natural environment through the drip and drift process, causing adverse effects on the surrounding environment;

(4) It is recommended that enterprises continue to pay close attention to the use of environmental protection facilities, and pay close attention to whether there are cracks on the ground in sewage treatment stations and hazardous waste warehouses. If cracks occur, timely measures are taken to repair and strengthen them to prevent pollutants from penetrating into the soil and causing pollution;

(5) Do a good job of monitoring well protection, design well table, well cover and other protection facilities, to facilitate the follow-up self-monitoring work.