CN203556633U

CN203556633U - Injection device for in-situ chemical restoration of soil and distribution system thereof

Info

Publication number: CN203556633U
Application number: CN201320617550.9U
Authority: CN
Inventors: 李兴
Original assignee: SUZHOU LVDI SOIL REMEDIATION TECHNOLOGY Co Ltd
Current assignee: SUZHOU LVDI SOIL REMEDIATION TECHNOLOGY Co Ltd
Priority date: 2013-09-30
Filing date: 2013-09-30
Publication date: 2014-04-23
Anticipated expiration: 2023-09-30

Abstract

The utility model belongs to the field of restoration of polluted soil, and particularly relates to an injection device for in-situ chemical restoration of soil and a distribution system thereof. The utility model discloses an injection device and a system for distributing the injection device, wherein the injection device comprises an inner core and a pervious bed coated at the periphery of the inner core. The injection device is characterized in that an axial groove and/or a convex rib are/is arranged on the outer surface of the inner core; the osmosis direction of the pervious bed is from inside to outside; the material of the pervious bed can select but is not limited to non-woven fabrics; the hair side is outward and backward to the inner core; the aperture of the pervious bed is 50-300 micrometers, and can be adjusted; the system for distributing the injection device is a plate inserting machine which comprises a base plate, a main rack, a vibrating hammer, an inserting pipe and a plug; the plug is arranged at the front end of the inserting pipe, and is a round plug. By the adoption of the injection device, a good injection effect can be ensured, the structure of the injection device is simplified, the construction speed of the injection device is improved, and the construction cost is reduced.

Description

Injection device for in-situ chemical soil remediation and arrangement system thereof

Technical Field

The utility model belongs to the restoration field of contaminated soil, concretely relates to a device that is used for normal position chemical oxidation/reduction to restore soil.

Background

In recent years, due to changes and adjustments of industrial structures and urban layouts, governments have led to move parts of chemical, pesticide, medicine, metallurgy and other polluted households and enterprises in a break, and leave some polluted sites and soils inside and outside cities.

On one hand, the government considers that the untreated polluted site will have immeasurable influence on sustainable development, and on the other hand, because the demand for land is increasingly vigorous in the economic development process, the government has high importance on the prevention of soil pollution and the remediation of the polluted soil in recent years so as to reasonably utilize and develop the remedied soil again.

Since the 80's of the 20 th century, contaminated soil remediation and restoration programs were established and developed in many countries throughout the world, particularly in developed countries. The U.S. investment for contaminated soil remediation in the 90's of the 20 th century is nearly $ 1000 billion. The theory and technology of polluted soil remediation have become the frontier of the whole environmental science and technology research. The process of soil remediation is rather lengthy and currently the solution of soil pollution problems requires the combined efforts of scientists in different disciplines such as agronomy, agriculture, ecology, biogeochemistry, marine science and the decision makers of production units and governments involved in agriculture, forestry, fisheries, etc.

At present, the domestic soil remediation is still in a starting stage, and various basic work progresses slowly in the soil pollution prevention and treatment of China, and the problems of an insanitary soil environment supervision and management system, serious loss of laws and regulations, weak supervision and monitoring capability, insufficient soil pollution prevention and treatment investment, low technological support capability in soil treatment and remediation and the like exist. The soil remediation technology is to be standardized, and the problems of high cost, low efficiency, incomplete decontamination, damage to the soil structure, secondary pollution in the remediation process and the like exist.

In the golden area of south of the ancient city of Suzhou, which is "inch of soil", original site plots of Suzhou chemical plants with the area of more than 600 mu are polluted by pesticides, and the soil is idle for nearly 6 years because of the existence of benzene, toluene, petroleum and other pollutants, which face the development difficulty. The Suzhou city leaders propose to be treated and developed for a plurality of meetings, and the situation is stranded due to immature technology and high cost (the fact that a local government and German form a special subject group to research the land parcel repair three years ago, 19 billion yuan RMB is finally quoted after two years, and a specific method is unknown). In recent years, local exploration and scientific research institutions carry out sampling analysis again, and the soil remediation scheme is researched, and analysis shows that: the main pollutants of benzene, toluene and petroleum are deeply distributed (the pollutants can still be detected at the depth of 18 m), the distribution condition of the pollutants in the soil is complex, the soil mainly comprises silty clay, silt and clay, the permeability coefficient in the horizontal direction is mainly within the range of 10E-6-10E-8 cm/s, the permeability coefficient in the vertical direction is mainly within the range of 10E-5-10E-7 cm/s, and the permeability is low.

Aiming at the characterization results of the polluted sites, the application range and the characteristics of various soil remediation technologies in the prior art are combined, for example: excavation, stabilization/solidification, chemical leaching, gas stripping, heat treatment, in situ chemical oxidation, in situ bioremediation, etc., taking into account: 1. if the displacement treatment is carried out on all excavations with eighteen meters deep, the workload is too large, organic pollution is volatilized during excavation, and the opinion of polluting surrounding residents is also the key problem to be considered during construction; 2. the air stripping method is not suitable for low-permeability polluted soil and has higher requirements on equipment; finally in situ chemical oxidation was screened as the most preferred repair method.

The in-situ chemical oxidation aims at the properties of soil/underground water pollutants, and on the basis of clearly characterizing the site pollution characteristics, a proper oxidant and related reagents are injected underground to fully contact the pollutants and oxidize the pollutants into non-toxic and harmless substances. In the chemical oxidation reaction process, the oxidant obtains electrons from organic pollutants such as benzene and chlorobenzene and is reduced into inorganic substances inherent in the environment, and the organic pollutants such as benzene and chlorobenzene lose electrons and are oxidized into CO2 and water. At present, the in-situ chemical oxidation technology is widely applied to the in-situ treatment of volatile and semi-volatile organic pollution such as benzene, toluene, xylene, chlorobenzene and the like, and the in-situ treatment of polluted soil and underground water such as polycyclic aromatic hydrocarbon, pesticide, explosive and the like in the United states, Europe, Australia and the like, and successful demonstration cases are carried out in more than ten countries and regions such as the United states Griffith (IN) chemical plant, Albert oil storage, Florida, Kenten (DE), Bound Brook gasoline station, rock Hill industrial land, south Carolina air force base, Australian oil and gas station, and coking plant and the like for treating the organic polluted soil such as benzene, toluene, ethylbenzene, xylene, chlorobenzene, phenol, organic pesticides, herbicide and the like.

Methods for chemically remediating soil in situ generally include: (1) and (3) laying an injection device: arranging the injection device in the soil to be restored; (2) filling of the medicament solution: adding a medicament solution into the injection device, wherein the medicament solution enters the soil to be repaired through the injection device; (3) monitoring and adjusting: monitoring the soil remediation process, and adjusting the distribution density and depth of an injection device, the concentration, the dosage, the flow rate and the pH of a medicament solution; (4) and repeating the steps until the soil remediation is completed.

In the prior art, in order to arrange an oxidant injection well in contaminated soil in an in-situ chemical oxidation remediation project, one commonly used technique for arranging the injection well is a Direct push drilling technique (Direct push drilling), which has the following disadvantages: 1. the cost is high (the drilling cost is 280 yuan/meter), the drilling speed is slow (only three holes are drilled in one day); 2. the maintenance time after drilling is not long, and because the breathing gaps of the soil around the holes are stuck and water cannot come out during drilling, the water is accumulated to the utmost extent and then breaks through the bonding layer to collapse together with mud belt water, the holes are squeezed, finally the soil is silted up, the injected medicament cannot reach the original drilling depth, and the decontamination cannot be thorough.

In addition, chinese patent No. 97117480.6 discloses an apparatus for forming an oxidation and precipitation zone or a reduction zone in an aquifer, which is distributed among a plurality of injection wells around one or more purified water pumping wells, each of which has a permeable outer pipe. To prevent the device from becoming clogged, a circulation vessel is provided at the upper end of the outer pipe from which there is a 1 st conduit which extends downwardly within the outer pipe and finally to the level of the upper part of the aquifer and which houses a pressure inlet means to form an upper injector, and a 2 nd conduit which supports at its upper end an externally sealingly mounted ball which is inflatable and sealingly engages the inner surface of the outer pipe, said 2 nd conduit being located above said ball and housing a pressure inlet means to form a 2 nd injector. The device in this solution is relatively complex.

Disclosure of Invention

The utility model aims at providing an injection device and lay system of this injection device suitable for normal position chemical remediation soil when guaranteeing good injection effect, simplify the structure of injection device, improve the construction speed of laying injection device, reduce construction cost simultaneously.

In order to achieve the purpose of the invention, the technical scheme adopted by the utility model is as follows: the utility model provides an injection apparatus suitable for soil is restoreed to normal position chemistry, includes inner core and cladding at the peripheral permeable formation of inner core, wherein, the surface of inner core is equipped with axial recess and/or protruding muscle, the infiltration direction of permeable formation is from inside to outside.

In the technical scheme, the inner core is formed by processing high-density polyethylene (HDPE) serving as a raw material through an extrusion molding process.

In the technical scheme, the grooves and/or the ribs are longitudinally arranged to form a channel, and the grooves and/or the ribs which are arranged in a vertically crossed manner form a support to prevent the permeation layer material from being embedded into the channel due to the pressure of the external soil.

In the above technical solution, the shape of the inner core is selected from, but not limited to: an elongated flat plate.

In the above technical solution, the material of the permeation layer can be selected from, but not limited to, non-woven fabric, and the wool side of the non-woven fabric faces outwards and away from the inner core, so that the drug solution can permeate outwards. The non-woven fabric is a non-woven fabric which is formed by directly utilizing high polymer slices, short fibers or filaments to form a net through air flow or machinery, then carrying out spunlace, needling or hot rolling reinforcement, and finally carrying out after-treatment. The non-woven fabric has a fiber web structure, so that the non-woven fabric has good permeability, is not easy to block, and can ensure that the medicament solution permeates outwards. When the hair side of the non-woven fabric is arranged outwards, the medicine solution in the injection device can be ensured to permeate outwards.

In the above technical solution, the permeation layer is provided with a plurality of permeation holes, the pore size of the permeation holes is preferably 50 μm to 300 μm, and the pore size of the permeation holes can be adjusted, so that the permeation speed and the flow rate of the drug solution can be adjusted.

The utility model discloses provide a system of laying above-mentioned injection device simultaneously, the system of laying above-mentioned injection device is a picture peg machine, including chassis, body frame, bobbing hammer, intubate, plug, the front end of intubate is located to the plug, the plug is the button head plug.

In the technical scheme, the height of the main frame is 15-30 meters, the driving depth is 15-24 meters, and the top of the main frame is provided with a pulley head for lifting the vibration hammer.

In the above technical solution, the chassis includes: crawler-type chassis, rail-type chassis, hydraulic walking chassis. The rail type chassis is used for softer geology, the crawler type chassis is used for harder geology, and the hydraulic walking type chassis is convenient and flexible to walk and can rotate for 360 degrees.

The method for carrying out in-situ chemical soil remediation by utilizing the injection device and the layout system comprises the following steps: (1) arranging an injection device; (2) filling the medicament solution; (3) monitoring and adjusting; (4) repeating the steps until the soil remediation is completed; wherein,

the specific steps of the layout of the injection device are as follows: after the board inserting machine is in place, the board inserting machine sinks by aiming at the jack position through the vibration hammer, the injection device penetrates through the insertion pipe and is connected with the plug at the front end, the insertion pipe props against the plug to insert the injection device to the designed soil penetration depth, and after the insertion pipe is pulled up, the injection device is left in the soil, namely the distribution operation of the injection device is completed; repeating the laying operation according to the required laying density;

the specific steps of the injection agent solution are as follows: injecting the medicament solution into an injection device, so that the medicament solution can permeate into the soil through the injection device;

the steps of monitoring and adjusting are as follows: sampling is carried out by adopting a jack of a plate inserting machine, soil and underground water are analyzed, and whether the arrangement density of the injection device, the concentration, the dosage, the pH value and the filling frequency of the medicament solution need to be adjusted or not is judged according to the analysis result.

In the above technical solution, the agent solution is selected from one or more of the oxidants commonly used in the in-situ chemical oxidation method. The method comprises the following steps: permanganate, persulfate, peroxide, and the like. Can be purchased directly or mixed by oneself, the raw materials are easy to obtain, and the functions are mainly as follows: the agent reacts with the sewage immediately after contacting, and the temperature is raised to melt polluted soil aggregates, so that the pollutants are converted into carbon dioxide, and the aim of removing the pollutants is fulfilled. Meanwhile, when the medicament solution exists in the injection device, the medicament solution can also be connected in series to absorb pollutants for equilibrium reaction, and the dosage of the medicament (active agent and oxidant) is required by the pollutant absorption respectively, thereby making up for the deficiency and achieving dynamic balance.

In the above technical solution, the injection device may be filled with the pharmaceutical solution by using a common filling device, and the common filling device is selected from, but not limited to: metering pumps, peristaltic pumps.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

1. the utility model discloses an injection device of medicament is laid to modified picture peg machine compares with the direct push technique among the prior art, the utility model has the advantages of high efficiency and economy. The plate inserting machine is a piling machine, and is mainly used in the fields of coastal soft foundation treatment and marine land reclamation construction in the prior art. The utility model discloses creatively with the field that the in situ chemistry restores soil is applied to the picture peg machine. The plate inserting machine can insert 8000-10000 meters every day, the deepest depth can reach 24 meters, and the calculation cost is lower than 1 yuan. And because the plate inserting machine is used for tamping and inserting the inserting plate by the vertical hammer, no slurry is generated, no wall is adhered, and the breathing hole is not blocked; meanwhile, the jack walls are also opened to form a plurality of net-shaped micro-slits, which is helpful for the permeation of the medicament.

2. The utility model discloses a design of injection device structure and the setting that filtration pore aperture can be adjusted make the picture peg be difficult to into mud, have the advantage that does not silt up and not block up, can guarantee to realize once only accomplishing the purpose of degree of depth decontamination operation.

3. The utility model discloses well spile machine that adopts can also carry out jack sampling test, and the sample analysis is convenient nimble, and the available spile machine jack water intaking is got and soil sample carries out chemical examination analysis in six hours of the injection, verifies whether medicament concentration and picture peg interval meet the requirements, in time adjusts its data, ensures soil restoration quality.

Drawings

FIG. 1 is a schematic view of an injection device according to a first embodiment;

FIG. 2 is a schematic view of a system for deploying an injection device according to a second embodiment;

FIG. 3 is a flow chart of soil remediation according to the third embodiment.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

the first embodiment is as follows:

referring to fig. 1, an injection device suitable for in-situ chemical soil remediation comprises an inner core 1 and a permeable layer 2 coated on the periphery of the inner core, wherein the inner core is made of High Density Polyethylene (HDPE) and processed by an extrusion molding process, and is in the shape of a long flat plate 10cm wide and 0.8cm thick; the outer surface of the inner core is provided with axial grooves and/or ribs which are longitudinally arranged to form a channel, and the ribs which are arranged in a vertically crossed manner form a support to prevent permeation layer materials from being embedded into the channel due to the pressure of external soil;

the permeable formation, the material of permeable formation is the non-woven fabrics to with its hair side outside dorsad inner core, the infiltration direction is from inside to outside, thereby can outwards permeate the pharmaceutical solution. The non-woven fabric is a non-woven fabric which is formed by directly utilizing high polymer slices, short fibers or filaments to form a net through air flow or machinery, then carrying out spunlace, needling or hot rolling reinforcement, and finally carrying out after-treatment. The non-woven fabric has a fiber web structure, so that the non-woven fabric has good permeability, is not easy to block, and can ensure that the medicament solution permeates outwards. The pore size of the permeation layer can be adjusted, and the preferable range is 50-300 μm.

Example two:

referring to fig. 2, the system for arranging the injection device is a plate inserting machine 3, and comprises a chassis, a main frame, a vibration hammer, an insertion tube and a plug, wherein the plug is arranged at the front end of the insertion tube, and is a round-head plug; the height of the main frame is 15-30 meters, the driving depth is 15-24 meters, and the top of the main frame is provided with a pulley head for lifting the vibration hammer; the chassis is a crawler-type chassis.

The method for carrying out in-situ chemical soil remediation by adopting the system for distributing the injection device comprises the following steps:

(1) after the board inserting machine is in place, the board inserting machine sinks by aiming at the jack position through the vibration hammer, the injection device penetrates through the insertion pipe and is connected with the plug at the front end, the insertion pipe props against the plug to insert the injection device to the designed soil penetration depth, and after the insertion pipe is pulled up, the injection device is left in the soil 4, namely the distribution operation of one injection device is completed; repeating the laying operation according to the required laying density;

(2) injecting the medicament solution into an injection device, so that the medicament solution can permeate into the soil through the injection device;

(3) sampling by using jacks of a board inserting machine, analyzing soil and underground water, and judging whether the distribution density of an injection device, the concentration, the dosage, the pH value and the filling frequency of a medicament solution need to be adjusted according to an analysis result;

(4) and repeating the steps until the soil remediation is completed.

Example three:

a method for in-situ chemical oxidation remediation of soil, as shown in fig. 3, comprising the steps of:

(1) site characterization: for better design and implementation of in situ oxidation techniques, a full understanding and characterization of the geological, hydrogeological, and spatiotemporal distribution of contaminants at the remediation site is required. The method mainly comprises the determination of chemical parameters such as the nature, concentration and spatial distribution of pollutants, the amount of pollutants (adsorbed, dissolved and byproducts) and the determination of geological parameters such as the nature (alkalinity, pH and Eh), composition, water permeability coefficient, porosity, groundwater flow and the like of soil at different depths. Site characterization is a method combining field monitoring with sample collection and laboratory instrumental analysis, and is a common standard method in the field.

(2) Selection of oxidant and determination of oxidant demand: aiming at the concentration and the property of focal pollutants (benzene, chlorobenzene and petroleum) in a polluted site and site condition characteristics (hydrogeology, soil property and composition), the oxidant suitable for the polluted soil to be treated is determined by the system research of more than 100 cases of in-situ chemical oxidation technology demonstration engineering cases at home and abroad (particularly the cases of the same pollutants and similar soil properties) and the laboratory bench test experiment result. The oxidant has high oxidation strength and high oxidation rate, is favorable for strengthening subsequent biodegradation and natural attenuation, and does not produce secondary products which are unfavorable for water and soil environments. In particular, the oxidant can be used at a low concentration and a low temperature<71 ℃) low pressure (<9.5 kPa/m. soil), easy operation, low cost and no secondary environmental risk. Laboratory experiments (water-soil ratio 4: 1; oxidant 4.5ml, concentration 30%; soil 25g, benzene mg/kg, chlorobenzene mg/kg, petroleum 520-600 mg/kg; results show that the oxidant can completely oxidize the pollutants in the soil, and the oxidized soil contains benzene and chlorobenzeneAnd petroleum pollutants are below the detection limit. On the basis of fully characterizing the properties and the composition of the soil polluted by the polluted soil to be treated, the concentration of pollutants and the characteristics of oxidants, the dosage of oxidants ([ Oxidant ] for treating the soil pollution is comprehensively determined by theoretical calculation and combining laboratory bench test results]Required = [Stoichiometric Demand]_Contaminant + [Soil Oxidant Demand]) Is 88.6L (30% by weight)

(3) Underground injection and transmission of oxidant: in order to ensure that the oxidant is transmitted to the whole underground pollution zone, on the basis of fully representing the hydrogeological conditions of the polluted site to be treated, a numerical model of water flow and solute transport of the polluted site is constructed by combining laboratory lab results and previous work experience, the migration distribution characteristics of chemical reagents which are injected into an aquifer in a well irrigation mode are simulated and analyzed, the influence radius of single well injection is determined, and key parameters such as the spatial pattern (the position of injection holes and the hole spacing) of injection holes, the reagent injection intensity, the injection speed and the like are optimally designed according to the influence radius.

And (3) arranging the injection device by referring to the method of the third embodiment, wherein the injection of the oxidant adopts a pulse type multiple injection mode, the injection concentration is 5-15% by weight concentration, the injection temperature is less than <71 ℃, and the pressure is less than <9.5 kPa/m.

The method can insert the device into the ground for 20 meters or more to realize the underground rapid injection of the oxidant, has low material cost and high jack speed, can overcome the influence of low permeability and slow mass transfer of the polluted soil on the contact oxidation of the oxidant and the pollutant by encrypting the oxidant injection hole, and realizes the rapid oxidation of the benzene, chlorobenzene and petroleum hydrocarbon pollutants in the soil.

(4) Experimental process and performance monitoring:

to better assess the effectiveness, safety, time and cost of oxidation of the oxidation technology used, the soil remediation process performed on-site should be monitored throughout the process (before, during and after the oxidation technology is applied).

To better assess the repair process, the monitoring performed during repair is referred to as process monitoring. For in situ chemical oxidation repair, process monitoring contains three different elements: 1) monitoring the process: tracking and checking the technical performance of the repair system; 2) risk monitoring: tracking health and safety risks during repair; 3) performance monitoring: the effect achieved by the repair is tracked and checked.

Process monitoring is performed as a quality control measure before, during and after oxidant injection. The process monitoring elements are:

confirming the injection amount, flow rate and oxidant concentration;

measuring the stability of an oxidant in the soil;

the concentration of the oxidant in a groundwater or surface air sample is measured.

With oxidants, process monitoring includes measurements of PH, temperature, pressure, oxygen concentration, and carbon dioxide concentration. These parameters used to monitor the repair process are frequently measured daily. The monitoring frequency of contaminants in soil, groundwater and ground air is slightly lower. In addition, to ascertain whether any preferential flow paths exist and to assess the distribution of the oxidant and any other substances required, monitoring wells are installed to determine whether the entire repair area has been treated. The main monitoring indexes, monitoring equipment and monitoring frequency are shown in the following table 1:

TABLE 1 Process monitoring and Performance detection indices, Equipment and frequency

Serial number	Monitoring index	Detection device	Detecting frequency
				1	Benzene and its derivatives	Gas chromatography/mass spectrometer	1 time per day
2	Chlorobenzene	Gas chromatography/mass spectrometer	1 time per day
				3	Petroleum products	Infrared oil detector	1 time per day
4	PH	PH meter	1 time per day
				5	Temperature of	Temperature instrument	1 time per day
6	Eh	Platinum electrode	1 time per day
				7	CO₂	CO₂Measuring instrument	1 time per day
8	DO	Dissolved oxygen tester	1 time per day
				9	Electrical conductivity of	Conductivity meter	1 time per day
10	Fe	O-phenanthroline colorimetry	1 time per day

Monitoring the above meaning in the repair process is to know the repair progress, dynamically adjust and optimize the repair plan, specifically:

1. monitoring the target contaminants, benzene, chlorobenzene, petroleum, can directly confirm that contaminants are still present near the respective monitoring point, and the delivery of the oxidant to the area should be considered.

2. Monitoring the electrode potential and the concentration of the oxidant, it is possible 1. evaluate the radius of influence of the oxidant injection holes; 2. evaluating the distribution condition of the oxidizing agent; 3. and the calculation of the oxidation reaction kinetics is favorable for designing a monitoring plan. In the pilot-scale test process, the influence radius of the oxidant injection hole can be calculated according to the monitoring result, the mass transfer condition of the oxidant is known, important parameters such as the distribution density of the oxidant injection holes and the concentration of the injected oxidant are dynamically adjusted and optimized, and the accuracy, economy and environmental protection of the repairing process are ensured.

3. Monitoring the pH value, and evaluating whether the pH value is an optimal value or not; 2. the effect of acid injection or pH adjustment on repair was evaluated. In the pilot test process, the pH value range which is most suitable for oxidizing pollutants by the oxidant to repair the soil can be evaluated and confirmed by combining the pH value monitored in real time and the repair progress obtained according to other monitoring information, and the pH value of the soil environment is dynamically adjusted and optimized.

4. Monitoring the concentration of carbon dioxide and the conductivity of underground water can judge the progress of remediation, because an oxidant can oxidize target pollutants into carbon dioxide, chlorine in chlorobenzene can be converted into chloride ions finally, and when the concentration of the chloride ions is increased, the conductivity of the underground water can be increased; detecting the carbon dioxide concentration and the conductivity of underground water as base lines before the beginning of the repair, monitoring the carbon dioxide concentration and the conductivity of the underground water in real time in the repair process, knowing the repair process and the oxidation reaction progress, and combining information obtained by other monitoring indexes, so that the repair scheme can be further adjusted and optimized, for example: the concentration and the dosage of the oxidant are adjusted, so that the waste of the oxidant is avoided; the formula of the oxidant is adjusted, for example, ferrous ions are added into hydrogen peroxide to form a Fenton reagent with stronger oxidizing capability, so that pollutants are oxidized more thoroughly.

5. The intensity of the reaction can be known by monitoring the temperature, because the selected oxidant is an exothermic reaction in the process of oxidizing pollutants, the factors of reaction activity and construction safety are considered, and the concentration, dosage, flow rate and frequency of the injected oxidant can be adjusted according to the monitored temperature, so that the repairing process is safe and controllable.

6. The degradation degree of the oxidant can be known by monitoring the dissolved oxygen, and the density of the injection holes can be adjusted accordingly, so that the distance and time for mass transfer are shortened, and the utilization rate of the oxidant is increased.

7. Monitoring the content of Fe in soil, on one hand, knowing the amount of the oxidant which is possibly additionally consumed by the Fe in a low valence state, and more importantly, knowing the promotion effect of the Fe which is used as a catalyst and the oxidant to jointly participate in repair on the oxidation reaction.

8. In determining whether remediation is complete, remediation effectiveness can be assessed by detecting a reduction in the concentration/content of the target contaminant in the groundwater, aquifer and non-aqueous phase liquid; evaluating whether a repair objective has been reached; monitoring soil gases and tail gases allows for assessment of the likelihood and route of volatile organic transport/exposure.

(5) And adjusting and managing soil remediation according to the monitoring result, and ensuring that the soil is accepted after remediation is completed.

Claims

1. The utility model provides an injection apparatus suitable for soil is restoreed to normal position chemistry, includes inner core and cladding at the outlying permeable formation of inner core, its characterized in that, the surface of inner core is equipped with axial recess and/or protruding muscle, the infiltration direction of permeable formation is from inside to outside.

2. The injection device of claim 1, wherein: the grooves and/or ribs are arranged longitudinally.

3. The injection device of claim 1, wherein: the grooves and/or the ribs are arranged in an up-and-down crossed manner.

4. The injection device of claim 1, wherein: the shape of the inner core is selected from, but not limited to: an elongated flat plate.

5. The injection device of claim 1, wherein: the material of the permeable layer may be selected from, but is not limited to, a nonwoven fabric, with the nonwoven fabric facing outwardly and away from the inner core.

6. The injection device of claim 1, wherein: the permeable layer is provided with a permeable hole, the aperture of the permeable hole is 50-300 μm, and the aperture size can be adjusted.

7. A system for deploying the injection device of claim 1, wherein: the system for laying the injection device is a plate inserting machine and comprises a chassis, a main frame, a vibration hammer, an insertion tube and a plug, wherein the plug is arranged at the front end of the insertion tube and is a round-head plug.