CN113426816B

CN113426816B - Intelligent remediation system and remediation method for contaminated site

Info

Publication number: CN113426816B
Application number: CN202110580193.2A
Authority: CN
Inventors: 何理; 孙同; 叶威; 尹方平
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-12-13
Anticipated expiration: 2041-05-26
Also published as: CN113426816A

Abstract

The invention discloses an intelligent repair system and a repair method for a polluted site, wherein the system comprises a real-time monitoring subsystem, a scheme decision subsystem and a repair subsystem, the real-time monitoring subsystem is used for monitoring polluted site information in real time and transmitting the polluted site information to the scheme decision subsystem, the scheme decision subsystem judges the monitored information, makes a decision and selects a corresponding repair subsystem for repair. The intelligent repair system and the repair method for the polluted site, provided by the invention, can adjust the repair strategy and the repair target in time according to the change of the pollution current situation of the polluted site, improve the repair efficiency, have the advantages of simple and convenient operation of the whole system, easiness in maintenance and capability of realizing efficient repair of the polluted site.

Description

Intelligent remediation system and remediation method for contaminated site

Technical Field

The invention belongs to the technical field of soil (underground water) remediation, and particularly relates to an intelligent remediation system and a remediation method for a contaminated site.

Background

Soil is the most important and basic comprehensive natural resource for human survival and development, and the soil environment condition not only directly influences the national economic development and the national soil resource environment safety, but also relates to agricultural product safety and human health. With the rapid development of industrialization in China, unreasonable exploitation of mineral resources, smelting discharge of the mineral resources, landfill, pollution of chemical plants, application of chemical fertilizers and pesticides and other reasons cause serious pollution to underground water and soil, and the phenomena of incomplete restoration and secondary rebound are caused due to the influence of complex hydrogeological conditions of polluted sites. Therefore, the method efficiently, greenly and intelligently repairs the soil and the underground water, realizes harmony and unity of economic, environmental and social benefits, and becomes a problem to be solved urgently at present.

In the prior art, the restoration technology of the polluted site is generally divided into three categories, namely a physical restoration technology, a chemical restoration technology and a biological restoration technology. The physical remediation technology is a technology for taking out or separating pollutants from soil through various physical processes, mainly comprises a thermal desorption technology, a microwave heating technology and a steam extraction technology, belongs to the thermal remediation technology, and is mainly used for remediation of organic contaminated soil; the chemical remediation technology mainly comprises a soil solidification/stabilization technology, a leaching technology, an oxidation-reduction technology, a photocatalytic degradation technology and an electrodynamic force remediation technology; the bioremediation technology mainly comprises phytoremediation, microbial remediation, biological combined remediation and other technologies. The physical technology for groundwater remediation mainly comprises an extraction treatment technology, an air injection technology, a multiphase extraction technology and an in-situ barrier technology, the chemical technology mainly comprises an in-situ chemical oxidation technology and an in-situ chemical reduction technology, and the biological technology mainly comprises an in-situ microorganism injection technology.

However, due to the fact that the pollutants in the polluted site are various and have large differences in physical and chemical properties, especially the occurrence forms of the pollutants in some aged polluted sites are more complex, and due to the complex hydrogeological conditions, serious challenges are brought to the actual effectiveness of the repair process, and good quality effects cannot be achieved by singly adopting the physical, chemical and biological repair technologies. For example: the method adopts a microwave heating technology to repair the polluted soil, has good removal effect on various organic pollutants, but can be realized only by adding a microwave absorbing material because the soil can not effectively absorb microwaves; the chemical leaching technology is not thorough in repair, the soil after leaching still contains a lot of pollutants and pollutants wrapped by leacheate, and the chemical leaching technology is only suitable for the soil treatment work with small area and pollution; although the electrodynamic force repairing technology is simple to operate, the treatment time is long, and the actual engineering requirements are difficult to adapt. In addition, the existing polluted site restoration has the problems of low automation degree and high safety risk.

In conclusion, the conventional remediation method in the prior art has the problems of long treatment period, high treatment cost, poor treatment effect and the like, and an intelligent remediation system for the polluted site, which has the advantages of short treatment period, low cost, remarkable treatment effect and flexible adjustment, is provided.

Disclosure of Invention

In order to overcome the problems, the invention provides an intelligent repair system and a repair method for a polluted site, which can automatically judge the current state of the polluted site by detecting the actual condition of the polluted site in real time, make a decision, select an optimal repair mode, accurately repair the polluted site, save resources and energy consumption, have high repair efficiency and good effect, and thus the invention is completed.

Specifically, the present invention aims to provide the following:

in a first aspect, an intelligent remediation system for a contaminated site is provided, the system comprises a real-time monitoring subsystem, a scheme decision subsystem and a remediation subsystem,

the real-time monitoring subsystem is used for monitoring the information of the polluted site in real time and transmitting the information to the scheme decision subsystem;

the scheme decision subsystem judges the monitored information, makes a decision and selects a corresponding repair subsystem for repair.

In a second aspect, a contaminated site remediation method is provided, and is preferably performed by using the above contaminated site intelligent remediation system, and the method includes the following steps:

step 1, acquiring pollution information of a polluted site to be repaired in real time;

2, selecting a proper repairing mode for repairing according to the pollution information;

and 3, evaluating the repairing effect of the repaired site, and performing subsequent treatment according to the evaluation result.

The invention has the advantages that:

(1) According to the intelligent remediation system for the polluted site, the actual condition of the site polluted area is detected in real time, the current state of the polluted site is automatically judged, a decision is made, an optimal remediation mode is selected, the polluted site can be accurately remedied, the resource and energy consumption are saved, the remediation efficiency is high, and the effect is good;

(2) The intelligent remediation system for the polluted site provided by the invention combines multiple remediation modes, and can flexibly remedy according to local conditions;

(3) The polluted site repairing method provided by the invention is simple to operate, easy to control conditions, short in repairing period, good in effect and suitable for large-scale application.

Drawings

Fig. 1 illustrates an architecture diagram of a contaminated site intelligent remediation system according to a preferred embodiment of the present invention.

Detailed Description

The present invention will be described in further detail below with reference to preferred embodiments and examples. The features and advantages of the present invention will become more apparent from the description.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

The invention provides an intelligent remediation system for a contaminated site, which comprises a real-time monitoring subsystem, a scheme decision subsystem and a remediation subsystem, wherein the real-time monitoring subsystem is used for monitoring contaminated site information in real time and transmitting the contaminated site information to the scheme decision subsystem, and the scheme decision subsystem judges the monitored information, makes a decision and selects a corresponding remediation subsystem for remediation, as shown in figure 1.

According to a preferred embodiment of the present invention, the contaminated site information monitored by the real-time monitoring subsystem includes environmental elements and equipment parameters, wherein,

the environmental factors comprise the types and the contents of heavy metals, the types and the contents of organic pollutants, monitoring time, pollution plume distribution range, groundwater level, soil moisture content, oxidation-reduction potential and pH value change;

the equipment parameters include reactor temperature, line flow, pressure, voltage and current.

Wherein, the check out test set of above-mentioned contaminated site information includes soil heavy metal detector, volatile organic compounds detector, soil moisture sensor, soil acidimeter, oxidation reduction potential appearance, ground water level monitor, pressure gauge and electromagnetic flow meter to detect the type and the content of soil heavy metal, the type and the content of organic pollutant, soil moisture content, pH, groundwater level, temperature and the flow and the pressure of each pipeline respectively.

In the present invention, the type of the above-mentioned detection device is not particularly limited, and a device having a corresponding function, which is commonly used in the prior art, may be used.

In a further preferred embodiment, the frequency of acquiring the contaminated site information by the real-time monitoring subsystem is adjusted according to the repair requirement,

preferably, the monitoring of the equipment parameters is real-time monitoring, and the monitoring frequency is preferably 3 times/min;

monitoring of environmental factors (e.g., contaminant content, groundwater level, pH) is dynamically adjusted according to the progress of remediation.

In the invention, preferably, the intelligent remediation system for the contaminated site further comprises a control subsystem, the intelligent remediation system performs self-feedback setting and dynamic linkage through the control subsystem, when the remediation subsystem operates, the monitoring frequency reaches the rated frequency of the instrument, and in other periods, the monitoring is performed every hour or every day according to the remediation requirements.

Wherein, the control subsystem can be a central processing unit.

In the invention, preferably, the real-time monitoring subsystem also monitors the information of the polluted site repaired by the repairing subsystem in real time.

According to a preferred embodiment of the present invention, the solution decision subsystem comprises an information receiving module, an information processing module, a decision control module and an information output module, wherein,

the information receiving module is used for receiving monitoring information transmitted by the real-time monitoring subsystem;

the information processing module stores and processes the received monitoring information to obtain a judgment result;

the decision control module makes a decision according to the judgment result;

and the information output module transmits the decision made by the decision control module to the repair subsystem for repair.

In a further preferred embodiment, the processing of the received monitoring information by the information processing module includes noise reduction processing and comparing data of the monitoring information with a contaminated site classification standard to obtain a determination result;

and the decision control module selects a repair mode or sends a stopping instruction according to the judgment result.

According to a preferred embodiment of the present invention, in the information processing module, a contaminated site classification standard is set in advance,

the classification standard of the polluted site comprises a soil pollution classification standard and a groundwater pollution classification standard,

preferably, the soil pollution classification standard is:

when the content of at least one index type organic pollutant or the content of heavy metal pollutant in the polluted site soil is higher than a risk screening value specified in soil pollution risk control standard (trial) (GB 36600-2018) for soil environmental quality construction land, but is lower than a specified risk control value, the pollution grade is light pollution;

when at least one item of heavy metal pollutant index content in the polluted site soil exceeds the risk control value limit value of soil pollution risk control standard (trial) (GB 36600-2018) for soil environmental quality construction site, but is less than or equal to 5 times of the control value, and the content of all kinds of organic pollutants is less than or equal to the risk control value limit value, the pollution grade is heavy metal pollution;

when the content of at least one organic pollutant in the soil of the polluted site exceeds a risk control value of soil pollution risk control standard (trial) (GB 36600-2018) of the soil environment quality construction site, but is less than or equal to 10 times of a limit value, and the content of all index heavy metal pollutants is less than or equal to the limit value of the risk control value, the pollution level is organic pollution;

when the content of heavy metal pollutants in the soil of the polluted site exceeds the limit value of the risk control standard (trial) (GB 36600-2018) of soil pollution risk in soil environmental quality construction land but is less than 5 times of the limit value, and the content of organic pollutants exceeds the limit value of the risk control value but is less than 10 times of the limit value, the pollution level is comprehensive pollution;

when the content of heavy metal pollutants in the soil of the polluted site exceeds 5 times of risk control value limit value of soil pollution risk control standard (trial) (GB 36600-2018) of soil environment quality construction land or 10 times of organic pollutant content of the soil of the polluted site exceeds the limit value, the pollution level is severe pollution;

the classification standard of the underground water pollution is as follows:

when the content indexes of organic pollutants or heavy metal pollutants in underground water of a polluted site exceed the IV class water standard of underground water quality standard (GB/T14818-2017) but are 1.5 times lower than the standard value, the pollution level is light pollution;

when at least one heavy metal pollutant in underground water of the polluted site exceeds the limit value of the IV-type water standard of the underground water quality standard (GB/T14818-2017) by 1.5 times but is less than or equal to 3 times, and the content of all kinds of organic pollutants is less than or equal to 1.5 times of the IV-type water standard limit value, the pollution level is heavy metal pollution;

when at least one organic pollutant in the underground water of the polluted site exceeds the limit value of the IV-type water standard of the underground water quality standard (GB/T14818-2017) by 1.5 times but is less than or equal to 10 times, and the content of all kinds of heavy metal pollutants is less than or equal to 1.5 times of the IV-type water standard limit value, the pollution level is organic pollution;

when at least one heavy metal pollutant content in underground water of a polluted site exceeds the limit value of the class IV water standard of the underground water quality standard (GB/T14818-2017) by 1.5 times but is lower than 3 times of the limit value, and at least one organic pollutant content exceeds the limit value of the class IV water standard by 1.5 times but is lower than 10 times of the limit value, the pollution level is comprehensive pollution;

when the content of heavy metal pollutants in underground water of a polluted site exceeds 3 times of the limit value of the IV-class water standard of underground water quality standard (GB/T14818-2017) or the content of organic pollutants exceeds 10 times of the limit value, the pollution level is severe pollution.

More preferably, the soil pollution classification standard is:

when the polluted site soil: when the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon, chlorobenzene, chromium, cadmium, lead and mercury falls within the following range, the pollution grade is light pollution: the content of benzene is not less than 4mg/kg and not more than 40mg/kg, the content of trichloroethylene is not less than 2.8mg/kg and not more than 20mg/kg, the content of petroleum hydrocarbon is not less than 4500mg/kg and not more than 9000mg/kg, and the content of chlorobenzene is not less than 270mg/kg and not more than 1000mg/kg; the content of chromium is less than or equal to 78mg/kg and is less than or equal to 5.7mg/kg, the content of cadmium is less than or equal to 172mg/kg and is less than or equal to 65mg/kg, the content of lead is less than or equal to 2500mg/kg and the content of mercury is less than or equal to 38mg/kg and is less than or equal to 82mg/kg;

when the polluted site soil: the content of at least one of chromium, cadmium, lead and mercury falls within the following range: the content of chromium is not less than 78mg/kg and not more than 390mg/kg, the content of cadmium is not less than 172mg/kg and not more than 860mg/kg, the content of lead is not less than 2500mg/kg and not more than 12500mg/kg, and the content of mercury is not less than 82mg/kg and not more than 410mg/kg; when the content of benzene is less than or equal to 40mg/kg, the content of trichloroethylene is less than or equal to 20mg/kg, the content of petroleum hydrocarbon is less than or equal to 9000mg/kg, and the content of chlorobenzene is less than or equal to 1000mg/kg, the pollution level is heavy metal pollution;

when the polluted site soil: the content of chromium is less than or equal to 78mg/kg, the content of cadmium is less than or equal to 172mg/kg, the content of lead is less than or equal to 2500mg/kg, and the content of mercury is less than or equal to 82mg/kg; and when the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon and chlorobenzene is in the following range, the pollution grade is organic pollution: the content of benzene is less than or equal to 40mg/kg and less than or equal to 400mg/kg, the content of trichloroethylene is less than or equal to 20mg/kg and less than or equal to 200mg/kg, the content of petroleum hydrocarbon is less than or equal to 90000mg/kg, and the content of chlorobenzene is less than or equal to 10000mg/kg;

when the polluted site soil: the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon and chlorobenzene is in the following range: the content of benzene is less than or equal to 40mg/kg and less than or equal to 400mg/kg, the content of trichloroethylene is less than or equal to 20mg/kg and less than or equal to 200mg/kg, the content of petroleum hydrocarbon is less than or equal to 90000mg/kg and the content of chlorobenzene is less than or equal to 1000mg/kg and less than or equal to 10000mg/kg; and the content of at least one of chromium, cadmium, lead and mercury falls within the following range: the content of chromium is not less than 78mg/kg and not more than 390mg/kg, the content of cadmium is not less than 172mg/kg and not more than 860mg/kg, the content of lead is not less than 2500mg/kg and not more than 12500mg/kg, the content of mercury is not less than 82mg/kg and not more than 410mg/kg, and the pollution level is comprehensive pollution;

when in the contaminated site soil: when the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon, chlorobenzene, chromium, cadmium, lead and mercury falls within the following range, the pollution grade is severe pollution: 400mg/kg of benzene, 200mg/kg of trichloroethylene, 90000mg/kg of petroleum hydrocarbon, 10000mg/kg of chlorobenzene, 390mg/kg of chromium, 860mg/kg of cadmium, 12500mg/kg of lead and 410mg/kg of mercury;

the classification standard of the underground water pollution is as follows:

when the underground water of the polluted site is: when the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon, chlorobenzene, chromium, cadmium, lead and mercury falls within the following range, the pollution level is light pollution: the content of benzene of 120 mu g/L is less than or equal to 180 mu g/L, the content of chloroform of 300 mu g/L is less than or equal to 450 mu g/L, the content of toluene of 1400 mu g/L is less than or equal to 2100 mu g/L, and the content of tetrachloromethane of 50 mu g/L is less than or equal to 75 mu g/L; the content of mercury is more than or equal to 0.002mg/L and less than or equal to 0.003mg/L, the content of chromium is more than or equal to 0.1mg/L and less than or equal to 0.15mg/L, the content of lead is more than or equal to 0.1mg/L and less than or equal to 0.15mg/L, and the content of cadmium is more than or equal to 0.01mg/L and less than or equal to 0.015mg/L;

when the underground water in the polluted site is: the content of at least one of chromium, cadmium, lead and mercury falls within the following range: the content of mercury is less than or equal to 0.003mg/L and less than or equal to 0.006mg/L, the content of chromium is less than or equal to 0.15mg/L and less than or equal to 0.3mg/L, the content of lead is less than or equal to 0.15mg/L and less than or equal to 0.30mg/L, and the content of cadmium is less than or equal to 0.015mg/L and less than or equal to 0.030mg/L; when the content of benzene is less than or equal to 180 mu g/L, the content of trichloromethane is less than or equal to 450 mu g/L, the content of toluene is less than or equal to 2100 mu g/L, and the content of tetrachloromethane is less than or equal to 75 mu g/L, the pollution level is heavy metal pollution;

when the underground water in the polluted site is: the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon and chlorobenzene is in the following range: the content of benzene is more than or equal to 180 mu g/L and less than or equal to 1200 mu g/L, the content of chloroform is more than or equal to 450 mu g/L and less than or equal to 3000 mu g/L, the content of toluene is more than or equal to 2100 mu g/L and less than or equal to 14mg/L, and the content of tetrachloromethane is more than or equal to 75 mu g/L and less than or equal to 500 mu g/L; when the content of mercury is less than or equal to 0.003mg/L, the content of chromium is less than or equal to 0.15mg/L, the content of lead is less than or equal to 0.15mg/L and the content of cadmium is less than or equal to 0.015mg/L, the pollution level is organic pollution;

when the underground water in the polluted site is: the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon and chlorobenzene is in the following range: the content of benzene of 180 mu g/L is less than or equal to 1200 mu g/L, the content of trichloromethane of 450 mu g/L is less than or equal to 3000 mu g/L, the content of toluene of 2100 mu g/L is less than or equal to 14mg/L, and the content of tetrachloromethane of 75 mu g/L is less than or equal to 500 mu g/L; and the content of at least one of chromium, cadmium, lead and mercury falls within the following range: the content of mercury is less than or equal to 0.003mg/L and less than or equal to 0.006mg/L, the content of chromium is less than or equal to 0.15mg/L and less than or equal to 0.3mg/L, the content of lead is less than or equal to 0.15mg/L and less than or equal to 0.30mg/L, the content of cadmium is less than or equal to 0.015mg/L and less than or equal to 0.030mg/L, and the pollution level is comprehensive pollution;

when the underground water in the polluted site is: when the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon, chlorobenzene, chromium, cadmium, lead and mercury falls within the following range, the pollution grade is severe pollution: the content of benzene is not less than 1200 mu g/L, the content of trichloromethane is not less than 3000 mu g/L, the content of toluene is not less than 14mg/L, the content of tetrachloromethane is not less than 500 mu g/L, or the content of mercury is not less than 0.006mg/L, the content of chromium is not less than 0.3mg/L, the content of cadmium is not less than 0.030mg/L, and the content of lead is not less than 0.30 mg/L.

In a further preferred embodiment, in the decision control module, a repair mode selection standard is preset to select a corresponding repair mode according to a determination result, wherein the repair mode selection standard includes a soil repair mode selection standard and a groundwater repair mode selection standard, and the soil repair mode selection standard is:

when the soil pollution level of the polluted site is slight pollution, a special remediation mode is not needed, real-time monitoring is carried out through a real-time monitoring subsystem, and pollution remediation is realized in a natural attenuation mode;

when the soil pollution level of the polluted site is heavy metal pollution, an electrodynamic force repairing mode is adopted;

when the soil pollution level of the polluted site is organic matter pollution, a thermal remediation mode is adopted;

when the soil pollution level of the polluted site is comprehensive pollution, firstly removing organic pollutants by adopting a thermal remediation mode, and then removing heavy metal pollutants by adopting an electrodynamic remediation mode;

the underground water remediation mode selection standard is as follows:

when the pollution level of underground water in the polluted site is light pollution, a special remediation mode is not needed, real-time monitoring is carried out through a real-time monitoring subsystem, and pollution remediation is realized in a natural attenuation mode;

when the pollution level of underground water in the polluted site is heavy metal pollution, a liquid phase extraction mode is adopted;

when the underground water pollution level of the polluted site is organic matter pollution, adopting a multiphase extraction and in-situ chemical oxidation mode for repairing;

when the pollution level of underground water in the polluted site is comprehensive pollution, the underground water is repaired by adopting a multiphase extraction and in-situ chemical oxidation mode.

Wherein the liquid phase extraction mode adopts a liquid phase extraction function in multi-phase extraction.

Preferably, when the pollution levels of the soil and the underground water in the polluted site are both severe pollution, a chemical leaching remediation mode is adopted for the soil on the upper layer of the polluted site; and (3) for the groundwater in the polluted site, repairing by adopting an extraction mode and an in-situ chemical oxidation mode.

More preferably, a multi-phase extraction module is adopted to extract pollutants which are easy to treat and have strong fluidity, and then the residual pollutants are continuously subjected to in-situ chemical oxidation for precise repair.

In the invention, when the pollution level of the polluted site is light pollution, if the polluted site has development needs in a short period, the remediation subsystem can be started for reinforcement.

The inventor discovers through a large amount of repeated researches that the pollution site is graded by adopting the standards and a proper repairing mode is selected, so that an accurate repairing mode can be selected for the pollution site, the treatment period is shortest, the cost is lowest and the treatment effect is optimal.

After the decision control module makes a decision according to the repair mode selection standard, the decision is transmitted to the repair subsystem through the information output module, and the repair subsystem repairs the polluted site according to the decision result and the corresponding repair mode.

According to a preferred embodiment of the present invention, the repair subsystem includes a chemical leaching module, a thermal repair module, an electrodynamic repair module, a multiphase extraction module, and a three-waste treatment module, so as to respectively implement a chemical leaching repair mode, a thermal repair mode, an electrodynamic repair mode, an easy-flowing-phase multiphase extraction, and treatment and disposal of waste gas, waste liquid, and waste residue.

In the invention, the chemical leaching restoration method is to adopt a chemical leaching technology with better economy to wash partial pollutants in soil into leacheate, and then utilize a vacuum suction technology to pump the leacheate to the ground surface for treatment.

Preferably, the chemical leaching module comprises four parts, namely a crushing unit, a medicament injection unit, a stirring unit and a waste liquid extraction and recovery unit, so as to realize the permeation enhancement of the geological body, the injection and dispersion of the remediation medicament and the recovery of the waste liquid.

The thermal remediation mode is that the soil in a polluted area is heated through a heating well, the temperature of the polluted soil is increased to be higher than the boiling point of a target pollutant, the target pollutant is selectively separated from soil particles in a gasification and volatilization mode by means of controlling the temperature of a system, the retention time of the polluted soil and the like, then the gas containing the target pollutant is condensed and collected to the ground surface by an extraction well for a series of treatments such as oxidation and the like, and finally the emission is completed after the gas reaches the standard.

Preferably, the thermal restoration module includes heating device and collection device, heating device carries the air that is heated to the contaminated area and makes the organic pollutant desorption, collection device pumps the organic pollutant of desorption to finally send ground three wastes processing apparatus to handle.

The thermal restoration module further comprises a temperature sensor and an electromagnetic flow meter which are arranged in each pipeline and each reaction area of the thermal restoration module.

More preferably, the temperature for thermal restoration is set to 100 to 400 ℃ in the present invention.

The electrodynamic force repairing mode is that an electrode is inserted into a polluted soil area, an electric field is formed after direct current is applied, pollutants in the soil directionally migrate under the action of the direct current electric field and are enriched in the electrode area, and then centralized treatment is carried out through other methods (electroplating, precipitation/coprecipitation, extraction, ion exchange resin and the like).

Preferably, the electrodynamic force repairing module comprises an electrode liquid storage tank, an electrode liquid valve, an electrode chamber, an electrode liquid flowmeter, a liquid adding pump valve, a liquid adding pump, an adsorption layer and an external direct current power supply.

More preferably, the voltage gradient of the electrodynamic force repair module is set to be 1.0-2.0V/cm, and the running time is 360h.

Multi-phase extraction (MPE) is a coupled upgrade of extraction-treatment and soil vapor extraction, and can be used for remediation of both contaminated soil and groundwater. The multiphase extraction technology is that liquid phase pollutants in a polluted site and polluted underground water are extracted by a liquid pump, the polluted gas in polluted soil (aeration zone) is extracted by negative pressure generated by a vacuum pump/a draught fan while the underground water is reduced, and then the extracted mixture of gas phase, water phase and organic liquid phase is separated by a multiphase separation system and can be treated.

Preferably, the multiphase extraction module comprises an extraction well, a conveying pipeline, a vacuum pump and waste water and waste gas treatment equipment, and mainly aims at performing extraction pretreatment on a pollution phase which is easy to flow in a soil and underground water pollution source, and the extraction mode can be a single-pump single-phase extraction mode or a multi-pump multiphase extraction mode.

In the invention, the specific devices adopted by the chemical leaching repair module, the thermal repair module, the electrodynamic force repair module, the multiphase extraction module and the three-waste treatment module are not particularly limited, and the devices or instruments commonly used in the field can be adopted as long as the functions of the chemical leaching repair, the thermal repair, the electrodynamic force repair, the multiphase extraction of underground water and the three-waste treatment can be realized.

In a further preferred embodiment, the chemical leaching module, the thermal remediation module, the electrodynamic remediation module and the multiphase extraction module are respectively and independently arranged so as to ensure that the working time is not affected.

Preferably, the parallel processing of various modules can be started according to the repair requirement, and then the comprehensive processing is finally carried out through the three-waste processing module.

According to a preferred embodiment of the invention, the information of the repaired pollution site of the repair subsystem is obtained by monitoring the real-time monitoring subsystem and is transmitted to the scheme decision subsystem.

Wherein, an information processing module in the scheme decision subsystem judges the repaired polluted site information, confirms whether the judgment result reaches the repair completion standard or not,

preferably, the repair completion criteria are:

the content of any organic pollutant and the content of any heavy metal pollutant in the repaired polluted site soil do not exceed risk screening values specified in soil pollution risk management and control standard (trial) for soil environmental quality construction land (GB 36600-2018), and

the content of any organic pollutant and the content of any heavy metal pollutant in underground water of the polluted site do not exceed the limit value of the water quality standard IV of underground water quality Standard (GB/T14818-2017).

Stopping repairing when the judgment result of the information processing module is displayed to reach the repairing standard; when the judgment result does not reach the repair standard, redesigning the repair strategy through the scheme decision subsystem and transmitting an instruction to the repair subsystem for repairing again; until the repair standard is reached.

According to the intelligent remediation system for the polluted site, the actual conditions of the soil and underground water polluted area are detected in real time, the current state of the polluted site is automatically judged, a decision is made, an optimal remediation mode is selected, the polluted site can be accurately remedied, the resource and energy consumption are saved, the remediation efficiency is high, and the effect is good.

The invention also provides a contaminated site remediation method, which is preferably carried out by adopting the above contaminated site intelligent remediation system, as shown in fig. 1, and the method comprises the following steps:

step 1, acquiring pollution information of a polluted site to be repaired in real time.

Wherein, the pollution information of the pollution site is preferably monitored by a real-time monitoring subsystem, the pollution site information comprises environmental elements and equipment parameters, wherein,

the environmental factors comprise the types and the contents of heavy metals, the types and the contents of organic pollutants, monitoring time, pollution plume distribution range, groundwater level, soil moisture content, oxidation-reduction potential and pH value change,

Preferably, the frequency of acquiring the pollution information is an intelligent regulation and control mode, and the frequency of acquiring the pollution site information by the real-time monitoring subsystem is adjusted by the scheme decision subsystem according to the repair process, wherein the equipment parameters (such as time, pressure, flow and the like) are monitored in real time, and the monitoring frequency is preferably 3 times/min;

the environmental factors (e.g., pollutant content, groundwater level, pH, etc.) are dynamically adjusted according to the remediation progress.

In the invention, preferably, the intelligent remediation system for the polluted site further comprises a control subsystem, the intelligent remediation system performs self-feedback setting and dynamic linkage through the control subsystem, when the remediation subsystem operates, the monitoring frequency reaches the rated frequency of the instrument, and in other periods, the monitoring is performed every hour or every day according to the remediation requirements.

And 2, selecting a proper repairing mode for repairing according to the pollution information.

In the present invention, it is preferable to determine the repair mode by using a scheme decision subsystem, wherein step 2 includes the following substeps:

and 2-1, comparing the acquired pollution information with a pollution site grading standard to determine the pollution level of the pollution site.

Wherein the classification standard of the polluted site comprises a soil pollution classification standard and a groundwater pollution classification standard,

preferably, the soil pollution classification standard is:

when the content of at least one index type organic pollutant or heavy metal pollutant in the polluted site soil is higher than a risk screening value specified in soil pollution risk control standard (trial) (GB 36600-2018) for soil environmental quality construction land, but is lower than a specified risk control value, the pollution level is light pollution;

when the content of heavy metal pollutants in the soil of the polluted site exceeds the limit value of a risk control value of soil pollution control standard (trial) (GB 36600-2018) of soil environment quality construction land and is less than 5 times of the limit value, and the content of organic pollutants exceeds the limit value of the risk control value and is less than 10 times of the limit value, the pollution level is comprehensive pollution;

when the content of heavy metal pollutants in the soil of the polluted site exceeds 5 times of the limit value of risk control value of soil pollution control standard (trial) (GB 36600-2018) for soil environmental quality construction land or 10 times of the limit value of organic pollutants, the pollution level is severe pollution;

the classification standard of the groundwater pollution is as follows:

when the content of organic pollutants and the content of heavy metal pollutants in underground water in a polluted site exceed the standard of class IV water in underground water quality standard (GB/T14818-2017) at the same time but are 1.5 times lower than the standard value, the pollution level is light pollution;

when the content of heavy metal pollutants in underground water of a polluted site exceeds 3 times of the standard limit value of class IV water of underground water quality Standard (GB/T14818-2017) or the content of organic pollutants exceeds 10 times of the limit value, the pollution level is severe pollution.

More preferably, the soil pollution classification standard is:

when the polluted site soil: the chromium content is less than or equal to 78mg/kg, the cadmium content is less than or equal to 172mg/kg, the lead content is less than or equal to 2500mg/kg, and the mercury content is less than or equal to 82mg/kg; and when the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon and chlorobenzene is in the following range, the pollution grade is organic pollution: the content of benzene is less than or equal to 40mg/kg and less than or equal to 400mg/kg, the content of trichloroethylene is less than or equal to 20mg/kg and less than or equal to 200mg/kg, the content of petroleum hydrocarbon is less than or equal to 90000mg/kg, and the content of chlorobenzene is less than or equal to 10000mg/kg;

the classification standard of the underground water pollution is as follows:

when the underground water in the polluted site is: when the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon, chlorobenzene, chromium, cadmium, lead and mercury falls within the following range, the pollution grade is light pollution: the content of benzene of 120 mu g/L is less than or equal to 180 mu g/L, the content of chloroform of 300 mu g/L is less than or equal to 450 mu g/L, the content of toluene of 1400 mu g/L is less than or equal to 2100 mu g/L, and the content of tetrachloromethane of 50 mu g/L is less than or equal to 75 mu g/L; the content of mercury is more than or equal to 0.002mg/L and less than or equal to 0.003mg/L, the content of chromium is more than or equal to 0.1mg/L and less than or equal to 0.15mg/L, the content of lead is more than or equal to 0.1mg/L and less than or equal to 0.15mg/L, and the content of cadmium is more than or equal to 0.01mg/L and less than or equal to 0.015mg/L;

when the underground water of the polluted site is: the content of at least one of chromium, cadmium, lead and mercury falls within the following range: the content of mercury is less than or equal to 0.003mg/L and less than or equal to 0.006mg/L, the content of chromium is less than or equal to 0.15mg/L and less than or equal to 0.3mg/L, the content of lead is less than or equal to 0.15mg/L and less than or equal to 0.30mg/L, and the content of cadmium is less than or equal to 0.015mg/L and less than or equal to 0.030mg/L; when the content of benzene is less than or equal to 180 mu g/L, the content of trichloromethane is less than or equal to 450 mu g/L, the content of toluene is less than or equal to 2100 mu g/L, and the content of tetrachloromethane is less than or equal to 75 mu g/L, the pollution level is heavy metal pollution;

when the underground water of the polluted site is: the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon and chlorobenzene is in the following range: the content of benzene of 180 mu g/L is less than or equal to 1200 mu g/L, the content of trichloromethane of 450 mu g/L is less than or equal to 3000 mu g/L, the content of toluene of 2100 mu g/L is less than or equal to 14mg/L, and the content of tetrachloromethane of 75 mu g/L is less than or equal to 500 mu g/L; when the content of mercury is less than or equal to 0.003mg/L, the content of chromium is less than or equal to 0.15mg/L, the content of lead is less than or equal to 0.15mg/L and the content of cadmium is less than or equal to 0.015mg/L, the pollution level is organic pollution;

when the underground water of the polluted site is: the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon and chlorobenzene is in the following range: the content of benzene is more than or equal to 180 mu g/L and less than or equal to 1200 mu g/L, the content of chloroform is more than or equal to 450 mu g/L and less than or equal to 3000 mu g/L, the content of toluene is more than or equal to 2100 mu g/L and less than or equal to 14mg/L, and the content of tetrachloromethane is more than or equal to 75 mu g/L and less than or equal to 500 mu g/L; and the content of at least one of chromium, cadmium, lead and mercury falls within the following range: the content of mercury is less than or equal to 0.003mg/L and less than or equal to 0.006mg/L, the content of chromium is less than or equal to 0.15mg/L and less than or equal to 0.3mg/L, the content of lead is less than or equal to 0.15mg/L and less than or equal to 0.30mg/L, the content of cadmium is less than or equal to 0.015mg/L and less than or equal to 0.030mg/L, and the pollution level is comprehensive pollution;

when the underground water of the polluted site is: when the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon, chlorobenzene, chromium, cadmium, lead and mercury falls within the following range, the pollution grade is severe pollution: the content of benzene is not less than 1200 mu g/L, the content of trichloromethane is not less than 3000 mu g/L, the content of toluene is not less than 14mg/L, the content of tetrachloromethane is not less than 500 mu g/L, or the content of mercury is not less than 0.006mg/L, the content of chromium is not less than 0.3mg/L, the content of cadmium is not less than 0.030mg/L, and the content of lead is not less than 0.30 mg/L.

And 2-2, determining a repairing mode according to the pollution level.

In the present invention, the selection of the remediation mode is determined according to a remediation mode selection criterion, preferably, the remediation mode selection criterion includes a soil remediation mode selection criterion and a groundwater remediation mode selection criterion, wherein the soil remediation mode selection criterion is:

when the pollution level of the groundwater of the polluted site is light pollution,

when the underground water pollution level of the polluted site is organic matter pollution, adopting multiphase extraction and original chemical oxidation mode to repair;

Preferably, when the pollution levels of soil and underground water in the polluted site are both severe pollution, a chemical leaching remediation mode is adopted for the soil on the upper layer of the polluted site; and (3) repairing the underground water of the polluted site by adopting an extraction mode and an in-situ chemical oxidation mode.

The system comprises a repair subsystem, a chemical leaching module, a thermal repair module, an electrodynamic force repair module, a multiphase extraction module and a three-waste treatment module, wherein the chemical leaching module, the thermal repair module, the electrodynamic force repair module, the multiphase extraction module and the three-waste treatment module in the repair subsystem are adopted to respectively realize a chemical leaching repair mode, a thermal repair mode, an electrodynamic force repair mode, the multiphase extraction of a mobile phase and the treatment and disposal of waste gas, waste liquid and waste residue.

Wherein, step 3 comprises the following substeps:

and 3-1, monitoring the repaired polluted site in real time.

Wherein, the real-time monitoring subsystem is used for monitoring the repaired polluted site information,

the frequency of the real-time monitoring subsystem for acquiring the polluted site information is adjusted according to the restoration requirement,

monitoring of environmental factors (such as contaminant content, groundwater level, pH, etc.) is dynamically adjusted according to the progress of remediation.

In the invention, the intelligent repair system carries out self-feedback setting and dynamic linkage through the control subsystem, when the repair subsystem operates, the monitoring frequency reaches the rated frequency of the instrument, and the monitoring is carried out every hour or once a day in other periods according to the repair requirement.

And 3-2, performing effect evaluation according to the monitoring data to obtain an evaluation result.

And the information processing module in the scheme decision subsystem judges the repaired polluted site information and confirms whether the judgment result meets the repair completion standard or not.

Preferably, the repair completion criteria are:

And 3-3, performing subsequent treatment according to the evaluation result.

When the judgment result of the information processing module is displayed to reach the repair standard, the repair is finished; and when the judgment result does not reach the repair standard, redesigning the repair strategy through the scheme decision subsystem and repairing the repair strategy again through the repair subsystem until the repair is completed.

The polluted site restoration method disclosed by the invention is simple to operate, easy to control conditions, short in restoration period and good in effect.

Examples

The present invention is further described below by way of specific examples, which are merely illustrative and do not limit the scope of the present invention in any way.

Example 1

In this embodiment, the contaminated site is: in a certain abandoned oil storage station, the shape of the oil storage pool is a rectangle of 150m multiplied by 150m, the petroleum hydrocarbon pollution reaches 10000mg/kg, and gas phase, liquid phase and mixed phase pollutants are dispersed in the land and abandoned for ten years. The hydrogeological conditions of the area are as follows: the site pollution area is about 10000m ² The underground soil layer condition is mainly filling-silty clay-sandy silty soil. The underground aquifer is located in the range of 6m-18m, and the permeability coefficient is small and is 1.02 multiplied by 10 ^-4 m/d, mainly located in the powder clay layer. The pollution distribution of underground water is mainly located in sandy silt, and due to the fact that the pollution time is long, the combination of pollutants and geologic bodies is firm, the removal rate is low due to the adoption of a single technology, and the repair period is short.

The specifications of the main instruments of the adopted repair system are shown in table 1:

TABLE 1

In the repairing process, the site adopts the repairing system and the repairing method, the system accurately carries out strategy optimization aiming at the phase state and concentration change of different pollutants through intelligent decision and real-time monitoring aiming at the characteristics of complex site pollution phase, high pollution concentration and high anisotropy, and the specific steps are as follows:

aiming at surface soil pollution:

firstly, the real-time monitoring subsystem carries out real-time monitoring on pollutants in a polluted site through a soil heavy metal detector and a volatile organic compound detector, and transmits monitoring information to an information receiving module of the scheme decision subsystem;

the information receiving module is used for carrying out noise reduction and amplification processing on the signals and then transmitting the information to the information processing module, the information processing module judges that the pollution level is organic pollution by comparing soil pollution classification standards and transmits constraint conditions and a restoration target to the decision control module;

wherein, the soil pollution classification standard is as follows:

when the polluted site soil: when the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon, chlorobenzene, chromium, cadmium, lead and mercury falls within the following range, the pollution grade is light pollution: the content of benzene is more than or equal to 4mg/kg and less than or equal to 40mg/kg, the content of trichloroethylene is more than or equal to 2.8mg/kg and less than or equal to 20mg/kg, the content of petroleum hydrocarbon is more than or equal to 4500mg/kg and less than or equal to 9000mg/kg, and the content of chlorobenzene is more than or equal to 270mg/kg and less than or equal to 1000mg/kg; the content of chromium is less than or equal to 78mg/kg and is less than or equal to 5.7mg/kg, the content of cadmium is less than or equal to 172mg/kg and is less than or equal to 65mg/kg, the content of lead is less than or equal to 2500mg/kg and the content of mercury is less than or equal to 38mg/kg and is less than or equal to 82mg/kg;

when the polluted site soil: when the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon, chlorobenzene, chromium, cadmium, lead and mercury falls within the following range, the pollution grade is severe pollution: 400mg/kg of benzene, 200mg/kg of trichloroethylene, 90000mg/kg of petroleum hydrocarbon, 10000mg/kg of chlorobenzene, 390mg/kg of chromium, 860mg/kg of cadmium, 12500mg/kg of lead and 410mg/kg of mercury;

and then, designing a repair scheme by the decision control module, and selecting a thermal repair module in the repair subsystem to repair the surface soil pollution, wherein the optimal heating temperature and heating time are calculated by a control subsystem (central processing unit), the program temperature is set by a plc system in the information output module, and the heating is accurately and automatically stopped when the pollutant concentration is below a risk value.

In the repairing process, the real-time monitoring submodule carries out real-time monitoring on the pollutant information of the polluted site all the time, and continuously transmits the pollutant information to the scheme decision subsystem for judgment, and then the decision control module sends a calling instruction or a stopping instruction to the repairing subsystem.

Meanwhile, the contaminated site is restored by adopting the thermal desorption process without intelligent regulation and control assistance, which is described in the document "Liuhui. Contaminated soil thermal desorption technology application and development trend [ J ]. Environment and sustainable development, 2019, 44 (04): 144-148", and the processing rate of the method in the prior art and the method in the embodiment for restoring the soil is compared, and the results show that: the treatment rate of the remediation method for soil remediation is 21t/h (ton/hour), which is 5% higher than that of a thermal desorption process without intelligent regulation and control assistance in the prior art.

Aiming at groundwater pollution, the system of the embodiment firstly realizes rapid reduction of gas phase and mixed phase petroleum hydrocarbon concentration through multiphase extraction and simultaneous extraction through an air pump and a submersible pump, then the system calls a chemical leaching module, an oxidant (persulfate) is injected into an aquifer in an injection mode, in-situ oxidation treatment is carried out on deep pollutants which are difficult to separate, and finally the groundwater quality is improved to IV-class water standard; meanwhile, the multi-phase extraction technology for soil and underground water remediation is developed by adopting the extraction-injection treatment process (Wang, heavy, zhang, etc.) without intelligent regulation in the prior art, wherein the research progress is J, ecological and rural environment science is reported, 2014, 30 (02): 137-145) for contrast remediation;

wherein, the classification standard of groundwater pollution is as follows:

when the underground water in the polluted site is: when the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon, chlorobenzene, chromium, cadmium, lead and mercury falls within the following range, the pollution level is light pollution: the content of benzene of 120 mu g/L is less than or equal to 180 mu g/L, the content of chloroform of 300 mu g/L is less than or equal to 450 mu g/L, the content of toluene of 1400 mu g/L is less than or equal to 2100 mu g/L, and the content of tetrachloromethane of 50 mu g/L is less than or equal to 75 mu g/L; the content of mercury is more than or equal to 0.002mg/L and less than or equal to 0.003mg/L, the content of chromium is more than or equal to 0.1mg/L and less than or equal to 0.15mg/L, the content of lead is more than or equal to 0.1mg/L and less than or equal to 0.15mg/L, and the content of cadmium is more than or equal to 0.01mg/L and less than or equal to 0.015mg/L;

when the underground water of the polluted site is: the content of at least one of chromium, cadmium, lead and mercury falls within the following range: the content of mercury is more than or equal to 0.003mg/L and less than or equal to 0.006mg/L, the content of chromium is more than or equal to 0.15mg/L and less than or equal to 0.3mg/L, the content of lead is more than or equal to 0.15mg/L and less than or equal to 0.30mg/L, and the content of cadmium is more than or equal to 0.015mg/L and less than or equal to 0.030mg/L; when the content of benzene is less than or equal to 180 mu g/L, the content of trichloromethane is less than or equal to 450 mu g/L, the content of toluene is less than or equal to 2100 mu g/L and the content of tetrachloromethane is less than or equal to 75 mu g/L, the pollution level is heavy metal pollution;

when the underground water in the polluted site is: the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon and chlorobenzene is in the following range: the content of benzene of 180 mu g/L is less than or equal to 1200 mu g/L, the content of trichloromethane of 450 mu g/L is less than or equal to 3000 mu g/L, the content of toluene of 2100 mu g/L is less than or equal to 14mg/L, and the content of tetrachloromethane of 75 mu g/L is less than or equal to 500 mu g/L; when the content of mercury is less than or equal to 0.003mg/L, the content of chromium is less than or equal to 0.15mg/L, the content of lead is less than or equal to 0.15mg/L and the content of cadmium is less than or equal to 0.015mg/L, the pollution level is organic pollution;

when the underground water in the polluted site is: the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon and chlorobenzene is in the following range: the content of benzene is more than or equal to 180 mu g/L and less than or equal to 1200 mu g/L, the content of chloroform is more than or equal to 450 mu g/L and less than or equal to 3000 mu g/L, the content of toluene is more than or equal to 2100 mu g/L and less than or equal to 14mg/L, and the content of tetrachloromethane is more than or equal to 75 mu g/L and less than or equal to 500 mu g/L; and the content of at least one of chromium, cadmium, lead and mercury falls within the following range: the content of mercury is less than or equal to 0.003mg/L and less than or equal to 0.006mg/L, the content of chromium is less than or equal to 0.15mg/L and less than or equal to 0.3mg/L, the content of lead is less than or equal to 0.15mg/L and less than or equal to 0.30mg/L, the content of cadmium is less than or equal to 0.015mg/L and less than or equal to 0.030mg/L, and the pollution level is comprehensive pollution;

when the underground water in the polluted site is: when the content of at least one of benzene, trichloroethylene, petroleum hydrocarbon, chlorobenzene, chromium, cadmium, lead and mercury falls within the following range, the pollution grade is severe pollution: 1200 mu g/L of benzene, 3000 mu g/L of chloroform, 14mg/L of toluene, 500 mu g/L of tetrachloromethane, or 0.006mg/L of mercury, 0.3mg/L of chromium, 0.030mg/L of cadmium and 0.30mg/L of lead.

Comparing the repair rate of the two repair methods to the groundwater, the results show that: in the repair system and the repair method of the embodiment, the repair rate of the pair of display is 0.042 ton/day, which is 30% higher than that of the extraction-injection treatment process without intelligent regulation in the prior art; the treatment rate of the remediation method for the groundwater is 219.84t/d (ton/day), which is improved by 9% compared with the multiphase extraction process without intelligent regulation and assistance in the prior art.

The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the invention. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention.

Claims

1. An intelligent repairing method for a polluted site is characterized in that,

the method comprises the following steps:

the method is carried out by adopting an intelligent remediation system of the polluted site, the system comprises a real-time monitoring subsystem, a scheme decision subsystem and a remediation subsystem,

the polluted site information monitored by the real-time monitoring subsystem comprises environmental elements and equipment parameters, wherein,

the environmental factors comprise the types and the contents of heavy metals, the types and the contents of organic pollutants, monitoring time, a pollution plume distribution range, underground water level, soil moisture content, oxidation-reduction potential and pH value change;

the equipment parameters comprise the temperature of each reactor, the flow rate of each pipeline, the pressure, the voltage and the current;

the information of the polluted site repaired by the repair subsystem is monitored and obtained by the real-time monitoring subsystem and is transmitted to the scheme decision subsystem;

the scheme decision subsystem judges the monitored information, makes a decision and selects a corresponding repair subsystem for repair;

the scheme decision subsystem comprises an information receiving module, an information processing module, a decision control module and an information output module, wherein,

the information receiving module is used for receiving the monitoring information transmitted by the real-time monitoring subsystem,

the decision control module makes a decision according to the judgment result, and a repair mode selection standard is preset in the decision control module to select a corresponding repair mode according to the judgment result, wherein the repair mode selection standard comprises a soil repair mode selection standard and a groundwater repair mode selection standard, and the soil repair mode selection standard is as follows:

the underground water remediation mode selection standard is as follows:

when the pollution level of underground water in the polluted site is heavy metal pollution, adopting a liquid phase extraction mode;

when the pollution level of the underground water of the polluted site is comprehensive pollution, the underground water is repaired by adopting a multiphase extraction and in-situ chemical oxidation mode,

wherein the liquid phase extraction mode adopts a liquid phase extraction function in multi-phase extraction;

when the pollution levels of soil and underground water in the polluted site are both severe pollution, adopting a chemical leaching restoration mode for the overground soil of the polluted site; for the groundwater in the polluted site, repairing by adopting an extraction mode and an in-situ chemical oxidation mode;

the information output module transmits the decision made by the decision control module to the repair subsystem for repair;

in the information processing module, a pollution site grading standard is preset,

the classification standard of the polluted site comprises a soil pollution classification standard and a groundwater pollution classification standard;

the soil pollution classification standard is as follows:

when the content of at least one index type organic pollutant or the content of heavy metal pollutant in the polluted site soil is higher than a risk screening value specified in soil pollution risk control standard (trial) (GB 36600-2018) for soil environmental quality construction land, but is lower than a specified risk control value, the pollution level is light pollution;

when the content of at least one organic pollutant in the contaminated site soil exceeds the risk control value of soil pollution risk control standard (trial) (GB 36600-2018) for soil environmental quality construction land but is less than or equal to 10 times of the limit value, and the content of all index heavy metal pollutants is less than or equal to the limit value of the risk control value, the pollution grade is organic pollution;

step 3, carrying out restoration effect evaluation on the restored field, and carrying out subsequent treatment according to the evaluation result;

step 3 comprises the following substeps:

step 3-1, monitoring the repaired polluted site in real time;

step 3-2, evaluating the effect according to the monitoring data to obtain an evaluation result;

and 3-3, performing subsequent treatment according to the evaluation result.

2. The method of claim 1, wherein the ground water pollution classification criteria is:

when at least one heavy metal pollutant in underground water of a polluted site exceeds the standard limit value of class IV water of underground water quality standard (GB/T14818-2017) by 1.5 times but is less than or equal to 3 times, and the content of all kinds of organic pollutants is less than or equal to 1.5 times of the standard limit value of class IV water, the pollution level is heavy metal pollution;

when at least one heavy metal pollutant content in underground water of a polluted site exceeds the standard limit value of class IV water of underground water quality standard (GB/T14818-2017) by 1.5 times but is lower than 3 times of the limit value, and at least one organic pollutant content exceeds the standard limit value of class IV water by 1.5 times but is lower than 10 times of the limit value, the pollution level is comprehensive pollution;

3. The method of claim 1, wherein the remediation subsystem comprises a chemical leaching remediation module, a thermal remediation module, an electro-kinetic remediation module, a multi-phase extraction module, and a three-waste treatment module, to achieve chemical leaching remediation, thermal remediation, electro-kinetic remediation, multi-phase extraction of mobile phase, and treatment and disposal of waste gases, waste liquids, and waste residues, respectively.

4. The method according to claim 1, characterized in that step 2 comprises the following sub-steps:

step 2-1, comparing the acquired pollution information with a pollution site grading standard to determine the pollution level of the pollution site;

and 2-2, determining a repairing mode according to the pollution level.