CN106807736B - In-situ chemical oxidation remediation method for soil and underground water by solid-phase shallow layer stirring - Google Patents
In-situ chemical oxidation remediation method for soil and underground water by solid-phase shallow layer stirring Download PDFInfo
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- CN106807736B CN106807736B CN201710117307.3A CN201710117307A CN106807736B CN 106807736 B CN106807736 B CN 106807736B CN 201710117307 A CN201710117307 A CN 201710117307A CN 106807736 B CN106807736 B CN 106807736B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Abstract
The invention provides a solid-phase shallow layer stirring in-situ chemical oxidation remediation method for soil and underground water, and belongs to the technical field of soil and underground water remediation methods. The invention comprises the following steps: (1) leveling a field and measuring a subarea; (2) crushing and screening the surface layer, and arranging a cofferdam; (3) assembling and debugging shallow layer stirring equipment; (4) adding a solid oxidant and an activator; (5) shallow layer stirring construction; (6) curing the surface layer; (7) reagent reaction and monitoring; (8) self-checking and acceptance. The method is suitable for repairing organic pollution of shallow saturated soil and underground water and repairing severe underground water pollution, and can solve the problem that the parameters of adding the medicament in one-round construction of the medicament for the shallow severe organic pollution are low, and the upper limit of the adding ratio of the oxidant K can reach 1.5-6%. The method has the advantages of simple and convenient operation, high construction efficiency and relatively long reaction period, and the oxidant can continuously react with the organic matters in the groundwater, thereby effectively preventing the concentration of the pollutants in the groundwater from rebounding.
Description
Technical Field
The invention relates to a solid-phase shallow layer stirring in-situ chemical oxidation remediation method for soil and underground water, and belongs to the technical field of soil and underground water remediation methods.
Background
Heavy metal and organic pollution of soil and groundwater are two typical types of pollution at present. The single and composite pollution of shallow polluted soil and underground water is common in polluted sites due to multiple exposure ways. Compared with the ex-situ remediation technology, the in-situ remediation technology has the advantages of no secondary pollution, no occupation of extra fields and the like and is gradually favored. The soil and underground water remediation technology mainly adopts physical, chemical and biological or combined technology, wherein the problem of how to uniformly add remediation agents (oxidant/reductant/microbial agents) into the underground environment is mainly solved by the chemical or biological remediation engineering technology. The shallow polluted soil and underground water are characterized in that soil quality is mainly mixed filling, pollutants are distributed extremely unevenly, and particularly, an ideal repairing effect is difficult to achieve by adopting an injection technology under the condition of a soil layer locally containing clay, so that the shallow polluted soil and underground water are not suitable for adopting an injection and deep stirring technology, and the shallow stirring technology is urgently needed.
The existing in-situ adding of the repairing medicament mainly has two modes: stirring and injecting/injecting, wherein the in-situ injecting/injecting is divided into: geoprobe direct pressure high pressure injection, well construction injection (PVC injection well), Chemgrout grouting technology, deep stirring in-situ remediation technology, high pressure rotary spraying remediation technology for soil and underground water, other rock and soil grouting technology and the like. The prior art can not solve the problem of in-situ remediation of shallow soil and underground water.
The target pollutants in the volatile and semi-volatile organic pollution site soil and the underground water have volatility, so the in-situ remediation technology is taken as a first-push technology to solve the problem of secondary pollution in the remediation process, and meanwhile, the in-situ remediation technology can avoid potential safety hazards caused by excavation and precipitation of a foundation pit and the like.
The In-Situ Chemical Oxidation (ISCO) technology has the advantages of capability of treating various organic pollutants simultaneously and high treatment efficiency. Meanwhile, chemical oxidation is generally not limited by contaminant concentration. Factors that influence in situ chemical oxidation techniques include: diffusion of the oxidant in the soil and groundwater, oxidant type, oxidant dosage, pollutant type and concentration, etc.
Recent survey data of the U.S. environmental protection agency show that chemical oxidation technology has been successfully applied to the remediation of thousands of polluted sites, and in recent site remediation cases, the ISCO technology accounts for about 33%, and has an increasing trend, and becomes the most rapidly developed soil/underground water dominant remediation technology at present.
Common chemical oxidation agents comprise fenton reagent, potassium permanganate, ozone, activated persulfate and the like, and oxidants such as the fenton reagent, the ozone, the activated persulfate and the like mainly rely on free radicals generated by the oxidants to oxidize organic pollutants, and can repair organic pollutants such as benzene series, nitrobenzene and petroleum hydrocarbon in soil and underground water. The Fenton reagent free radical has very strong oxidizing power and can oxidize various organic pollutants, but the oxidizing process is not selective, and the oxidizing process is very short in existence time in underground water, so that how to effectively feed an oxidizing agent into a repairing area and ensure that the generated free radical can be timely and fully contacted with the pollutants is very important for the repairing effect. The activated persulfate has the advantages of strong adaptability, long acting, strong oxidability, broad spectrum, low chemical demand (SOD) value of soil and the like. The common activating mode or activating agent for persulfate (K medicament for short) comprises high heat, alkali and Fe2+And H2O2And the like. By activating the persulfate ions, more powerful radical ions are generated, and more difficult-to-degrade organic contaminants can be oxidized. The alkali is adopted as the activation method, so that the method is more economical, continuous, safe and effective.
In the Chinese invention patents related to well construction injection technology, such as 'an organic polluted soil and underground water in-situ remediation device and remediation method' with the application number of 201410387735.4 (the publication number of CN104174634B, the publication number of 2016 (5/18/2016)), and 'an in-situ chemical oxidation injection device for remedying polluted soil and underground water' with the application number of 201410615166.4 (the publication number of CN104438315A, the publication number of 2015 (3/25/2015)).
U.S. patent No. US 2003/0069142 discloses a chemical oxidation injection well injection system, which comprises a flow guide baffle plate arranged at the front section of a screen pipe filled with solid powder agent, and the agent in the screen pipe is dissolved and then diffused to a target area through the flow guide baffle plate along with the flow direction of ground water so as to repair polluted soil and ground water.
U.S. patent No. US 2008/0174571a1 discloses a chemical oxidation in situ injection well remediation technique that oxidatively remediates contaminated soil and groundwater by injecting hydrogen peroxide, ozone and compressed air into the ground through an injection well.
The invention patent with the application number of 201410831123.X (application publication number CN104624629A, application publication date 2015 5/20) discloses a method for repairing an organic matter polluted site by adopting a bidirectional stirring injection method, and the invention patent with the application number of 201610461742.3 (application publication number CN105964677A, application publication date 2016 9/28) discloses a soil and underground water in-situ chemical oxidation high-pressure injection optimization repairing method.
The application process of the repair technology needs a series of in-situ repair systems and repair methods to realize the addition of the repair medicament.
Disclosure of Invention
The invention aims to solve the problems that the stirring depth of the existing in-situ remediation system is too large, and the shallow mixing effect is difficult to ensure by an injection well or high-pressure injection, and further provides a solid-phase shallow-layer stirring in-situ chemical oxidation remediation method for soil and underground water.
The purpose of the invention is realized by the following technical scheme:
a soil and underground water solid-phase shallow layer stirring in-situ chemical oxidation remediation method comprises the following steps:
step one, leveling the field, partitioning and measuring and paying off
Soil and underground water plots are firstly leveled, the setting-out positioning is measured after the plots are leveled, the grid is finely divided, and each stirring single block is sequentially numbered and divided into a crushed soil stirring operation area and an uncrushed soil stirring operation area;
step two, crushing, screening and setting cofferdam on the surface layer
The first excavator is used for crushing, screening and repairing concrete ground on the surface layer of the area or a building foundation, and after the screening surface layer is cleaned, a cofferdam is constructed around the stirring partition;
step three, assembling and debugging shallow layer stirring mechanical equipment
The connecting rod of the second excavator is directly connected with the connecting rod on the rotary stirring head to form a shallow layer stirring complete equipment of the second excavator and the rotary stirring head, the rotary stirring head is driven by a hydraulic motor to do rotary motion in the vertical direction, the excavator runs at the periphery of the cofferdam arranged in the second step, and the shallow layer stirring operation is realized within the operation radius range;
step four, adding solid-phase medicament
The forklift is used for respectively conveying bagged powdery oxidant K medicament and activator E medicament, and the two medicaments are manually disassembled and bagged and then are respectively added into corresponding repairing subareas by a powder filling bucket on a first excavator; adding the medicament E when the medicament K is stirred and white powder can not be seen; recording the adding data of K medicament and E medicament in a single block;
step five, shallow layer stirring operation
After a solid-phase oxidant and an activator are respectively added into a first excavator, the first excavator is subjected to initial stirring for 20-30 min, shallow layer stirring equipment assembled by a second excavator and a rotary stirring head is used for stirring a remediation area, the stirring objects are miscellaneous fill and a silty clay saturated layer below an underground water line, a single block is stirred for a set time, and the periphery of the stirring is marked by a warning tape after the stirring is finished;
step six, surface layer curing
After shallow stirring operation is completed for 2-4 h, carrying out surface layer curing construction after a first excavator cleans an excavator bucket, wherein the curing treatment depth range is 0-1.5 m, sulfate-resistant dustproof cement and powdery bentonite are adopted as curing materials, and the sulfate-resistant dustproof cement and the powdery bentonite are added into soil according to a certain weight percentage;
seventhly, carrying out shallow layer stirring construction in the next subarea
Repeating the fourth step and the sixth step to complete the shallow layer stirring construction of the next subarea until the shallow layer stirring repair construction of the whole land is completed, wherein the maximum repair depth is 4 m;
step eight, medicament reaction and monitoring
The method comprises the following steps that the sufficient reaction time of a soil and underground water remediation agent is 1-2 months, the ground meets the sampling strength requirement after 1-2 weeks of the beginning of the reaction, a Geoprobe drilling machine is adopted to set a plurality of underground water monitoring wells with the caliber of 2 inches and made of PVC materials in a region where one round of stirring remediation is completed, the positions of screen pipes of the underground water monitoring wells are located in shallow underground water, the pH value and the residual K agent parameter in the underground water are monitored periodically, and the conditions of oxidant residue and the pH value of the underground water are monitored;
step nine, self-checking and acceptance
After the K medicament fully reacts with soil and underground water for 1-2 months, soil sample sampling points are distributed in a repairing area, soil and underground water samples are taken, and parameters of pollutant concentration are detected in a laboratory so as to test the in-situ shallow layer repairing effect.
The invention has the beneficial effects that:
firstly, the repair cost is far lower than the technologies of in-situ heating, thermal desorption and the like. The repairing efficiency of the in-situ system and the pollutant removing effect can be optimally achieved.
Secondly, shallow stirring medicament selection: the chemical oxidant is preferably K medicament, has better stability, and can be directly added in a solid form. Other solid oxidation agents such as high manganese acid salt have poor safety, are easy to spontaneously combust when being wetted or encountering organic matters such as cane sugar and the like under the normal temperature condition, have poor sense, are not suitable for preparing agent solutions on site, and are limited in engineering application for a plurality of reasons. The activator is preferably an E medicament, the reaction is mild, the reaction is violent by adopting calcium oxide, a large amount of heat is generated, and the secondary pollution is serious; the liquid caustic soda is not suitable for selection because of non-uniform mixing with the solid K medicament; the reaction speed of the hydrogen peroxide is too fast, the hydrogen peroxide has no continuous effect on underground water, and the hydrogen peroxide is not suitable for selection.
Thirdly, partition construction principle and cofferdam setting: when the medicament is accurately added, the operation radius parameters of the shallow layer stirring equipment are met by controlling the operation surface, and the secondary pollution is effectively controlled and reduced.
Fourthly, operation of the rotary shallow layer stirring equipment: after solid medicament is added into the excavator for stirring once, the special stirring head equipment is adopted for re-stirring, the problem that a roller type strong stirring head is easy to wrap a drill bit to slip on site can be effectively solved, clay glue caking is broken up in the stirring process, the full mixing effect of the repairing medicament and a polluted medium is ensured, and thus the reaction condition is ensured. Meanwhile, solid medicament is directly added through the excavator, so that the potential safety hazard caused by the blockage of a drill bit pipeline is avoided.
Fifthly, surface layer (shallow layer) solidification improves cement proportion (has activation effect): the proportion of the cured cement is not too high, so that the oxidation reaction is limited and the channel is blocked. Surface layer curing on the other hand, it is also one of the control measures for secondary pollution control. And (4) curing the stirring area, wherein the ground strength can meet the requirement of drilling sampling after 1-2 weeks.
Compared with an injection well technology, a deep stirring technology and a high-pressure injection technology, the method is suitable for deep pollution remediation and treatment, and shallow pollution smaller than 4m is not suitable for well construction or injection operation.
And compared with deep stirring (such as hot air stripping deep stirring) and high-pressure injection technology (such as Geoprobe drill injection and high-pressure rotary jet injection), large-scale deep stirring drilling machine equipment is required, installation and debugging are relatively complicated, and the energy consumption of the equipment is high. The invention adopts the stirring equipment of the excavator and the special stirring head, can directly add the solid medicament to directly stir, has high medicament adding ratio, and can solve the problem of shallow heavy pollution of soil and underground water.
Drawings
FIG. 1 is a flow chart of a solid-phase shallow-layer stirring in-situ chemical oxidation remediation method for soil and groundwater.
FIG. 2 is a schematic diagram of the working principle of a soil and groundwater solid-phase shallow-layer stirring in-situ chemical oxidation remediation system.
FIG. 3 is a schematic structural diagram of a rotary stirring head.
FIG. 4 is a side view of a rotary agitator head.
FIG. 5 is a front view of a rotary stirring head
Reference numerals in fig. 2 to 5 include 1a forklift, 2 a bagged chemical, 3 a chemical detachable into a charge bucket, 4 a first excavator, 5a charge bucket, 6 a powdery K chemical, 7a powdery E chemical, 8 a crushed soil stirring operation region, 9a stirring direction, 11 a second excavator external excavator connecting rod, 12 an uncrushed soil stirring operation region, 13 a second excavator, 14 a miscellaneous fill (contaminated layer), 15a powdery clay (contaminated layer), 16 a fine sand (non-contaminated layer), 17 a rotary stirring head, 18 a contaminated soil and underground water mixed with the chemical, 19 an underground water line, 21 a connecting rod, 22 a main steel structure, 23 a driving sprocket, 24 a hydraulic motor, 25 a tension pulley, 26 a rake, 27 a chain, 28 a wear-resistant steel sheet cutting head, 29a driven sprocket, and 30 a cutting direction of the rotary stirring head during in-situ stirring operation.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.
The method for repairing soil and underground water by solid-phase shallow layer stirring and in-situ chemical oxidation comprises the following steps:
step one, leveling the field, partitioning and measuring and paying off
Soil and underground water plots are firstly leveled, refined partitions are formed according to 5m multiplied by 5m grids, measurement and setting-out positioning are carried out, and all stirring partitions are numbered in sequence and are divided into a crushed soil stirring operation area and an uncrushed soil stirring operation area.
Step two, crushing, screening and setting cofferdam on the surface layer
The first excavator is used for crushing, screening and repairing concrete ground on the surface layer of an area or a building foundation, and after the screening surface layer is cleaned, a cofferdam with the height of 0.5m is constructed around a stirring partition.
Step three, assembling and debugging shallow layer stirring mechanical equipment
The connecting rod of the second excavator is directly connected with the connecting rod on the rotary stirring head to form a shallow stirring complete equipment of the second excavator and the rotary stirring head, and the rotary stirring head can do rotary motion in the vertical direction through the drive of a hydraulic motor. And the excavator runs at the periphery of the cofferdam arranged in the step one, and shallow layer stirring operation is realized within the operating radius range of the excavator.
Step four, adding solid-phase medicament
The forklift respectively conveys 25kg of bagged powdery K medicament (persulfate) and activator E medicament (calcium hydroxide), and the two medicaments are manually disassembled and bagged and then are respectively added into corresponding repairing subareas by a medicament filling bucket on a first excavator. Adding the E medicament when the K medicament is stirred and no white powder is visible. And recording the adding data (bag number) of the K medicament and the E medicament in a single block.
Step five, shallow layer stirring operation
And step four, after the solid-phase oxidant and the solid-phase activator are respectively added into the excavator I, the excavator I is subjected to primary stirring for 20-30 min, and then a shallow layer stirring device assembled by the excavator II and a rotary stirring head is used for stirring the remediation area (miscellaneous fill), wherein the stirring objects are miscellaneous fill (pollution layer) and a silty clay (pollution layer) saturated layer below the underground water line. Stirring for 1.5-2 h in a single block until clay blocks are scattered, and ensuring that the solid medicament is fully and uniformly stirred with saturated soil and underground water. And marking the periphery with warning tape after stirring.
Step six, surface layer curing
After the shallow layer stirring operation is completed for 2-4 hours, carrying out surface layer solidification construction after a first excavator cleans an excavator bucket, wherein the depth range of solidification treatment is 0-1.5 m, the solidification material adopts sulfate-resistant dustproof cement and powdery bentonite, the adding amount of the sulfate-resistant dustproof cement is 10-15% (wet weight of soil), and the adding amount of the powdery bentonite is 5-10% (wet weight of soil).
Seventhly, carrying out shallow layer stirring construction in the next subarea
And repeating the fourth step to the sixth step to finish the shallow layer stirring construction of the next subarea until the shallow layer stirring repair construction of the whole land is finished, wherein the maximum repair depth is not more than 4 m.
Step eight, medicament reaction and monitoring
The sufficient reaction of the remediation agent in the soil and the groundwater needs 1-2 months. After 1-2 weeks, the ground meets the sampling strength requirement, a Geoprobe drilling machine is adopted to set a plurality of underground water monitoring wells with the calibers of 2 inches and made of PVC materials in the area where one round of stirring and repairing is completed, the positions of the screen pipes are located in shallow underground water, the pH and residual K medicament parameters in the underground water are monitored periodically, and the conditions of oxidant residue and the pH value of the underground water are monitored.
Step nine, self-checking and acceptance
And step eight, after the K medicament fully reacts with the soil and the underground water for 1-2 months, arranging soil sample sampling points in the restoration area, taking soil and underground water samples, and detecting pollutant concentration parameters in a laboratory to check the in-situ shallow layer restoration effect.
Example 1
The project is soil and underground water remediation engineering of a certain Nanjing chemical plant, the soil remediation engineering quantity is 25.8 ten thousand, the underground water remediation engineering quantity is 17 ten thousand, and the construction period is 150 days. The maximum pollution depth of the shallow soil layer of the site is 4m, the main strata are miscellaneous filling soil and silty clay layers, and the underground water is buried shallow (about 1 m) and abundant. The target pollutants in the shallow soil/underground water are VOCs/SVOCs organic matters such as chlorobenzene, benzene, p/o-nitrochlorobenzene and the like.
In order to solve the problem of shallow pollution in-situ chemical oxidation repair engineering, a shallow stirring in-situ chemical oxidation process is adopted for 11% of the soil repair engineering quantity and 8% of the underground water repair engineering quantity in the engineering, wherein the solid-phase shallow stirring in-situ chemical oxidation repair process is adopted for 13% of the soil and underground water repair engineering quantity in the shallow stirring process. Practice shows that the invention can effectively solve the problems of shallow soil pollution and moderate-to-severe organic pollution of shallow underground water.
The process has the advantages that:
(1) repair depth range: the method is suitable for a plurality of shallow layer pollutions of 1-2 m, 1-3 m, 1-4 m, 2-3 m and 2-4 m, and the maximum repairing depth is not more than 4m under the condition of artificial backfill or an original soil layer saturated area.
(2) Broad spectrum of pollutants remediation: SOD value is low, VOCs/SVOCs such as benzene, aniline, chlorobenzene and p/o-nitro have high efficiency, and particularly, the remediation of severe underground water is superior to that of Fenton medicament.
(3) The in-situ shallow layer stirring process, the refined partition and the surface layer curing construction can effectively avoid secondary pollution.
(4) The mechanical construction efficiency is high: the single set of shallow layer stirring equipment has the following processing capacity: the soil restoration is 600-1200 m3The underground water is restored to 150-300 m2And the maximum repair depth is 4 m.
In this example, the application of the soil and groundwater solid-phase shallow-layer stirring in-situ chemical oxidation process is shown in the following table.
TABLE 1 statistics of soil and groundwater solid-phase shallow-layer agitation in-situ chemical oxidation process applications
The method is applied to the N5-1 plots, and the adding ratio of the oxidant K is 1.53 percent. The soil and groundwater remediation effects are shown in tables 2 and 3.
TABLE 2 soil remediation Effect comparison
TABLE 3 groundwater remediation Effect
As shown in fig. 2 to 5, the soil and groundwater solid-phase shallow layer stirring in-situ chemical oxidation remediation system according to the embodiment includes: the device comprises a solid-phase medicament adding unit and a shallow layer stirring unit, wherein the solid-phase medicament adding unit comprises a forklift 1, a first excavator 4 and a medicament charging bucket 5, and the medicament charging bucket 5 is arranged at the front end of a support arm of the first excavator 4; the shallow layer stirring unit comprises a second excavator 13, an external excavator connecting rod 11 and a rotary stirring head 17, one end of the external excavator connecting rod 11 is connected with the front end of a support arm of the second excavator 13, and the other end of the external excavator connecting rod 11 is connected with the rotary stirring head 17.
The rotary stirring head 17 comprises: the connecting rod 21, the main steel structure 22, the driving sprocket 23, the hydraulic motor 24, the take-up pulley 25, the tine harrow 26, the chain 27, wear-resisting steel sheet cutting head 28 and driven sprocket 29, the connecting rod 21 is fixed on the top of main steel structure 22, the upper end of main steel structure 22 is provided with the driving sprocket 23, the lower extreme of main steel structure 22 is provided with driven sprocket 29, be connected by chain 27 transmission between driving sprocket 23 and the driven sprocket 29, the tine harrow 26 has been equallyd divide on the chain 27, be fixed with wear-resisting steel sheet cutting head 28 on the tine harrow 26, the hydraulic motor 24 is fixed on the upper portion of main steel structure 22, the output of hydraulic motor 24 is connected with driving sprocket 23 transmission, be equipped with the take-up pulley 25 on the main steel structure 22, the take-up pulley 25 is connected with chain 27 rotation, the connecting rod 21 is used for being connected with external excavator connecting rod 11.
The connecting rod 21 is directly connected with the external excavator connecting rod 11 of the second excavator through a hinge pin.
6-12 groups of toothed rakes 26 are uniformly distributed on the chain 27.
And 4-6 wear-resistant steel sheet cutting heads 28 are arranged on each group of tooth rakes 26.
The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A solid-phase shallow-layer stirring in-situ chemical oxidation remediation method for soil and underground water, which is characterized in that,
step one, leveling the field, partitioning and measuring and paying off
Soil and underground water plots are firstly leveled, the setting-out positioning is measured after the plots are leveled, the fine partitioning of grids is carried out, and each single block is sequentially numbered and divided into a crushed soil stirring operation area and an uncrushed soil stirring operation area;
step two, crushing, screening and setting cofferdam on the surface layer
The first excavator is used for crushing, screening and repairing concrete ground on the surface layer of the area or a building foundation, and after the screening surface layer is cleaned, a cofferdam is constructed around the stirring partition;
step three, assembling and debugging shallow layer stirring mechanical equipment
The connecting rod of the second excavator is directly connected with the connecting rod on the rotary stirring head to form a shallow layer stirring complete equipment of the second excavator and the rotary stirring head, the rotary stirring head is driven by a hydraulic motor to do rotary motion in the vertical direction, the excavator runs at the periphery of the cofferdam arranged in the second step, and the shallow layer stirring operation is realized within the operation radius range;
step four, adding solid-phase medicament
The bagged powdery oxidant K medicament and the bagged powdery activator E medicament are respectively conveyed by a forklift, and the two medicaments are respectively added into corresponding repairing subareas by a powder filling bucket on a first excavator after the bagged medicaments are manually removed; adding the medicament E when the medicament K is stirred and white powder can not be seen; recording the adding data of K medicament and E medicament in a single block;
step five, shallow layer stirring operation
After a solid-phase K medicament and a solid-phase E medicament are respectively added into a first excavator, the first excavator is subjected to initial stirring for 20-30 min, shallow layer stirring equipment assembled by a second excavator and a rotary stirring head is used for stirring a remediation area, the stirring objects are miscellaneous fill and a silty clay saturated layer below an underground water line, a single block is stirred for a set time, and the periphery is marked by a warning tape after the stirring is finished;
step six, surface layer curing
After shallow stirring operation is completed for 2-4 h, carrying out surface layer curing construction after a first excavator cleans an excavator bucket, wherein the curing treatment depth range is 0-1.5 m, sulfate-resistant dustproof cement and powdery bentonite are adopted as curing materials, and the sulfate-resistant dustproof cement and the powdery bentonite are added into soil according to a certain weight percentage;
seventhly, carrying out shallow layer stirring construction in the next subarea
Repeating the fourth step to the sixth step to complete the shallow layer stirring construction of the next subarea until the stirring repair construction of the shallow layer of the whole plot is completed, wherein the maximum repair depth is 4 m;
step eight, medicament reaction and monitoring
The method comprises the following steps that the sufficient reaction time of a soil and underground water remediation agent is 1-2 months, the ground meets the sampling strength requirement after 1-2 weeks of the beginning of the reaction, a geopsob drilling machine is adopted to set a plurality of underground water monitoring wells with the caliber of 2 inches made of PVC materials in a completed stirring remediation area, screen pipes of the underground water monitoring wells are located in shallow underground water, the pH value and residual K agent parameters in the underground water are monitored periodically, and the conditions of oxidant residue and underground water pH value are monitored;
step nine, self-checking and acceptance
After the K medicament fully reacts with soil and underground water for 1-2 months, soil sample sampling points are distributed in a repairing area, soil and underground water samples are taken, and parameters of pollutant concentration are detected in a laboratory so as to test the in-situ shallow layer repairing effect.
2. The soil and groundwater solid phase shallow layer stirring in-situ chemical oxidation remediation method according to claim 1, wherein in the first step, the grid is finely partitioned, and the grid partitioning is performed on a single block according to the size of 5m x 5 m.
3. The soil and groundwater solid-phase shallow layer stirring in-situ chemical oxidation remediation method according to claim 1, wherein in the second step, the height of the constructed cofferdam is 0.5 m.
4. The soil and groundwater solid-phase shallow stirring in situ chemical oxidation remediation method of claim 1, wherein in step four, the K agent is persulfate and the E agent is calcium hydroxide.
5. The soil and groundwater solid-phase shallow-layer stirring in-situ chemical oxidation remediation method according to claim 1, wherein in the fifth step, the stirring time of a single block is 1.5-2 hours until clay blocks are scattered.
6. The soil and groundwater solid phase shallow layer stirring in-situ chemical oxidation remediation method according to claim 1, wherein in the sixth step, the adding amount of the sulfate-resistant dustproof cement is 10% -15% of the wet weight of the soil, and the adding amount of the powdery bentonite is 5% -10% of the wet weight of the soil.
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| CN108380658B (en) * | 2018-01-30 | 2021-05-28 | 上海勘察设计研究院(集团)有限公司 | In-situ remediation method for shallow layer stirring of polluted soil |
| CN108380659B (en) * | 2018-01-30 | 2020-07-31 | 上海勘察设计研究院(集团)有限公司 | Maintenance method suitable for in-situ chemical oxidation remediation of polluted soil |
| CN108160701A (en) * | 2018-04-10 | 2018-06-15 | 上海岩土工程勘察设计研究院有限公司 | Suitable for the in-situ immobilization maintenance process of Polluted Soil shallow-layer stirring |
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| CN111721903B (en) * | 2020-05-26 | 2021-06-11 | 北京市环境保护科学研究院 | Method for determining in-situ oxidation repair radius of underground water |
| CN112916597B (en) * | 2021-02-26 | 2022-06-28 | 煜环环境科技有限公司 | Stirring equipment for in-situ remediation of shallow contaminated soil |
| CN114570754A (en) * | 2021-11-05 | 2022-06-03 | 南京林业大学 | Method for treating low-boiling-point volatile organic polluted soil by using carbon dioxide |
| CN114991113A (en) * | 2022-06-29 | 2022-09-02 | 煜环环境科技有限公司 | Temporary storage site sludge remediation treatment method |
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