CN107159697B - Organic contaminated soil and underground water remediation method and agent - Google Patents
Organic contaminated soil and underground water remediation method and agent Download PDFInfo
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- CN107159697B CN107159697B CN201710606420.8A CN201710606420A CN107159697B CN 107159697 B CN107159697 B CN 107159697B CN 201710606420 A CN201710606420 A CN 201710606420A CN 107159697 B CN107159697 B CN 107159697B
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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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a method for remedying organic contaminated soil and underground water, wherein pollutants of the soil and the underground water are organic pollutants; the treatment method comprises two parts, namely, (1) a soil and underground water superposed pollution area in an area A adopts an in-situ chemical oxidation remediation technical method; (2) and the B area only has an underground water pollution area, and adopts a pumping treatment technical method. The method selects a combination mode of multiple repair technologies to repair the soil and the underground water in different areas, can ensure that the soil and the underground water achieve a good repair effect, cannot cause cross contamination and waste of reagents, can ensure that the construction period is shortened, and saves the cost.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a method and a medicament for repairing organic polluted soil and underground water.
Background
The pollutants in the organically polluted soil and underground water are mainly benzene, 1, 2-dichloroethane, chlorobenzene, 1, 4-dichlorobenzene, 1, 2-dichlorobenzene and chloroform. Different remediation techniques are proposed for different contaminants. At present, the major methods for repairing the organic polluted soil mainly comprise an in-situ/ex-situ chemical oxidation technology, a thermal desorption technology, a cement kiln co-processing technology, a bioremediation technology, a soil leaching technology and the like; the method for remedying the organic polluted underground water mainly comprises a pumping treatment technology, a permeable reaction wall technology, an in-situ chemical oxidation technology, a monitoring type natural attenuation technology and the like. The current common treatment process is to adopt one method to treat the waste water separately. Particularly, the pumping treatment technology is generally adopted for underground water remediation technology. Soil and groundwater pollution exist in a field, and a polluted area is mainly divided into two areas, wherein an area A is a soil and groundwater superposed polluted area, and an area B is an groundwater polluted area (the soil is not polluted). If the pumping treatment technology is adopted in the groundwater remediation process, the soil remediation of the area A can be carried out after the groundwater pumping remediation of the area A and the groundwater of the area B is finished, so that the construction period is prolonged, and the cost is increased; if the in-situ chemical oxidation treatment technology is adopted, the soil in the area can be subjected to cross contamination in the in-situ chemical oxidation process of the area B, and meanwhile, the oxidation reagent partially reacts with organic matters in the soil, so that reagent waste is caused.
According to the invention, aiming at the actual situation of a site, a plurality of restoration technology combination modes are selected for restoring soil and underground water, the soil and underground water in the site coincide with a polluted area, the water-soil combination treatment is considered, the construction period can be effectively shortened, the cost is saved, and the soil and underground water are treated simultaneously, namely an in-situ chemical oxidation restoration technology is adopted; in the independent polluted area of underground water in the site, the soil in the aquifer is easily disturbed and cross-polluted in the in-situ chemical oxidation treatment process, and the extraction treatment technology is adopted for treatment.
Disclosure of Invention
In order to solve the problems, the invention selects a combination mode of multiple repair technologies to repair the soil and the underground water in different areas, thereby not only ensuring that the soil and the underground water achieve better repair effect, but also ensuring that the construction period is shortened and the cost is saved while cross contamination and medicament waste are not caused.
The technical scheme of the invention is as follows:
a method for remediating organically-polluted soil and underground water, wherein pollutants in the soil and the underground water are organic pollutants; the treatment method comprises two parts, namely, (1) a soil and underground water superposed pollution area in an area A adopts an in-situ chemical oxidation remediation technical method; (2) and the B area only has an underground water pollution area, and adopts a pumping treatment technical method.
Preferably, the organic pollutant is one or more of benzene, 1, 2-dichloroethane, chlorobenzene, 1, 4-dichlorobenzene, 1, 2-dichlorobenzene and chloroform.
Preferably, the superposed polluted region of the soil and the underground water in the region A mainly means that the pollution of the soil and the pollution of the underground water exist within the specified pollution depth range of the region A, and pollutants in the soil and the underground water are treated by the same technology in the treatment process; the fact that only the underground water pollution area exists in the area B mainly means that underground water pollution exists but soil pollution does not exist in the specified pollution depth range of the area.
Preferably, the pollution of the soil and the pollution of the underground water mainly mean that pollution factors contained in the soil or the underground water in the area exceed the in-site restoration target value.
Preferably, the method for treating the in-situ chemical oxidation of the superposed polluted area of the soil and the underground water in the area A comprises the following steps,
the method comprises the following steps: detecting the total amount of pollutants, namely respectively sampling and detecting soil and underground water in a polluted area by using a drilling machine, and detecting the total amount of field organic pollutants;
step two: weighing the agents, namely respectively detecting the concentration of organic pollutants in underground water and soil according to the first step, and weighing the oxidizing agents so as to achieve sufficient addition of the agents and reach the standard after treatment;
step three: preparing a medicament, namely preparing a sufficient amount of medicament into a saturated aqueous solution, and carrying out the next step of operation when the medicament is fully dissolved in a medicament tank;
step four: the method comprises the following steps of injecting a medicament into the polluted soil by using a mixing pile machine, simultaneously assisting with a mixing function to promote the injected medicament to be fully and uniformly mixed with the polluted soil, and simultaneously uniformly mixing the medicament with underground water in soil pores so as to achieve the purpose that the medicament is fully contacted with the polluted soil and the underground water, and avoid the phenomena of low medicament utilization rate and the like;
step five: after the medicament is injected into soil and underground water, standing for 5-7 days to ensure that pollutants and the medicament in the soil and the underground water fully react;
step six: after 7 days of maintenance, respectively sampling and detecting soil and underground water in the area, and carrying out next detection and analysis on the total amount of the organic pollutants in the field in a laboratory;
step seven: and checking whether the treated soil and underground water reach the standard or not, comparing the detection data of the soil and underground water after the agent is added with the target repairing value of each pollutant in the field, if the detection value is smaller than the target repairing value, judging the soil and underground water to reach the standard, and if the detection value is larger than the target repairing value, judging the soil and underground water to be unqualified, adding the secondary agent, and checking and detecting the soil and underground water after the soil and underground water reach the standard.
Preferably, the method for pumping and treating the groundwater pollution area in the area B comprises the following steps: building a pumping well in a pollution range, namely building the well by using a drilling machine, wherein a well perforated pipe is arranged in the depth range of a polluted aquifer and is deep to a pollution depth bottom plate;
step two: numbering the pumping wells, and numbering the pumping wells from the center to the periphery of the pollution range;
step three: extracting underground water, namely starting water suction pumps in sequence from the center to the periphery of a pollution range to pump the underground water, wherein in the process of pumping the water, the first well in the center range pumps the water, meanwhile, observing the water level change of other wells, and when the water levels of other wells are obviously reduced, starting the peripheral water suction pumps in sequence to pump the water;
step four: pumping underground water for collection, connecting a water pumping pipe to a water collecting tank, and pumping the underground water into the water collecting tank;
step five: pumping underground water for disposal, connecting a water collecting tank with sewage treatment integrated equipment, starting the equipment to automatically add medicine, react and precipitate;
step six: and collecting the treated underground water, connecting a water outlet of the sewage treatment equipment with another water collecting tank, carrying out concentrated collection on the treated underground water, sampling and detecting, and using for allocating on-site remediation engineering medicaments after the treated underground water is qualified.
Preferably, the in-situ chemical oxidation treatment technology is mainly characterized in that a stirring pile machine is adopted for injecting the oxidation reagent, and stirring is assisted at the same time, so that the reagent and the polluted medium (soil or underground water) are uniformly mixed.
Preferably, the extraction treatment technology is mainly to construct an extraction well in a pollution range, the extraction technology is adopted to extract a polluted medium (mainly underground water) to a sewage treatment device for treatment, and the sewage treatment device mainly adopts a method of adding Fenton with pH =11 to treat sewage.
The preferable agent adopted by the method for restoring the organic polluted soil and the underground water is persulfate after alkali excitation.
Preferably, the persulfate is sodium persulfate.
The invention has the beneficial effects that:
according to the invention, two areas exist in the field, namely an area A soil and underground water superposed polluted area, and an area B only has an underground water polluted area. In consideration of field reality, the area A adopts an in-situ chemical oxidation treatment technology, so that water and soil are treated simultaneously, on one hand, the water and soil are prevented from being treated separately, the construction period is prolonged, the repair construction period is saved, on the other hand, the water and soil are treated simultaneously by adopting the same repair technology, and the repair cost is saved; meanwhile, the area B adopts a pumping treatment technology, so that the phenomenon that the same as the area A is avoided, on one hand, an in-situ treatment technology is adopted, and in the medicament injection process, the medicament reacts with soil organic matters in the water-containing layer to waste the medicament, on the other hand, the recycling of the treated underground water is avoided, the medicament is prepared by using other water sources to cause resource waste, and on the other hand, the secondary pollution caused by the disturbance of peripheral pollution in the medicament injection process is also effectively avoided. In the two parts of areas, because the pollution conditions are different, a method combining multiple repair technologies is adopted, so that the cost and the construction period are effectively saved, and meanwhile, the repair effect is good.
Drawings
FIG. 1 is a contamination range plot;
FIG. 2 is a schematic diagram of a soil and groundwater in-situ chemical oxidation technique;
FIG. 3 is a roadmap for groundwater extraction treatment technology;
FIG. 4 is a schematic diagram of an extraction well pattern;
fig. 5 is an in-situ chemical oxidation profile plot.
In the attached drawings, region 1-A; region 2-B; 3-monitoring well and pumping well; 4-radius of influence; 5-well spacing; 6-injection site; 7-no injection site; 8-injected site.
Detailed Description
The invention introduces a method for treating organic polluted soil and underground water by taking a polluted site of a certain pesticide plant in Guangdong as an example.
On the basis of on-site investigation results, selecting polluted underground water in a site and soil coincident pollution to respectively collect underground water and soil samples, selecting the underground water sample with the number of W1, and selecting the soil sample with the number of S1; and selecting a groundwater sample with the number W2 only in the groundwater pollution area. The laboratory test results of the W1, S1 and W2 samples are shown in Table 1 and Table 2.
TABLE 1 detection results of characteristic pollutants at underground water and soil sampling points selected in experiment in mg/kg
Table 1. soil sampling point location characteristic pollutant detection result mg/kg
TABLE 2 detection result ug/L of characteristic pollutant of selected groundwater sampling point
According to the actual pollution condition of a site, the area A is polluted by two media of underground water pollution and soil pollution, namely a soil and underground water superposed pollution area; and the B area only has groundwater pollution, namely a groundwater pollution area. Contaminated soil and groundwater in the field may pose a risk to adults and children, presenting a significant health risk. Therefore, pollution source treatment technology is mainly adopted for the polluted soil and underground water in the area, pollution is reduced from the source, and harm to human health and environment is eliminated. The field is mainly formed by mixing silt soil with a coarse sand layer, meanwhile, the buried depth of underground water is 0.5-1.0m, and the geological condition is complex, so that the treatment of the soil and the underground water is finally determined in the area A by adopting an in-situ chemical oxidation remediation technology, and the treatment of the underground water is performed in the area B by adopting a pumping treatment technology.
The hydrogeological conditions in the field are as follows: the stable water level in the field is buried to a depth of about 2-4m, wherein the filling layer is an aeration zone, and the permeability coefficient of the sludge layer of 2-13m is smaller and is 10-5An order of magnitude, but is a diving aquifer because it is saturated and releases water itself; silt clay, silt soil and coarse sand are arranged in the depth range of 13-20m, wherein the silt soil is in a saturated state and releases water and is a diving aquifer, the coarse sand is a diving aquifer, the silt clay is a relative water-resisting layer, but the water-resisting layers are not uniformly distributed, so that the hydraulic connection among the aquifers is close; 20-29m is sandy clay, and is a diving aquifer; 29-34.5m is completely weathered granite and is a water-resisting layer, and the whole field is distributed, so that the bottom plate of a diving aquifer in the field is buried to about 29 m. The groundwater characteristics of each rock and soil layer are shown in table 3.
TABLE 3 underground water characteristics table of each rock and soil layer
The in-situ chemical oxidation of the superposed polluted area of the soil and the underground water in the area A comprises the following steps:
the method comprises the following steps: detecting the total amount of pollutants, namely respectively sampling and detecting soil and underground water in a polluted area by using a drilling machine, and sending the soil and the underground water to a laboratory for detecting the total amount of site-specific pollutants, namely benzene, 1, 2-dichloroethane, chlorobenzene, 1, 2-dichlorobenzene, 1, 4-dichlorobenzene, chloroform, petroleum hydrocarbon and p-chloro-o-toluidine;
step two: weighing the medicament, namely respectively detecting the concentration of the underground water and the soil inner site characteristic pollutants according to the first step, and weighing the oxidizing medicament so as to achieve sufficient addition of the medicament and reach the standard after treatment;
step three: preparing a medicament, namely preparing a sufficient amount of medicament into a saturated aqueous solution, and carrying out the next step of operation when the medicament is fully dissolved in a medicament tank;
step four: the method comprises the following steps of injecting a medicament into the polluted soil by using a mixing pile machine, simultaneously assisting with a mixing function to promote the injected medicament to be fully and uniformly mixed with the polluted soil, and simultaneously uniformly mixing the medicament with underground water in soil pores so as to achieve the purpose that the medicament is fully contacted with the polluted soil and the underground water, and avoid the phenomena of low medicament utilization rate and the like;
step five: after the medicament is injected into soil and underground water, standing for 7 days to ensure that pollutants and the medicament in the soil and the underground water fully react;
step six: and (3) respectively sampling and detecting soil and underground water in the area after 7 days of maintenance, and carrying out next detection and analysis on the total amount of site-specific pollutants, namely benzene, 1, 2-dichloroethane, chlorobenzene, 1, 2-dichlorobenzene, 1, 4-dichlorobenzene, chloroform, petroleum hydrocarbon and p-chloro-o-toluidine in a laboratory.
Step seven: and checking whether the treated soil and underground water reach the standard or not, comparing the detection data of the soil and underground water after the agent is added with the target repairing value of each pollutant in the field, if the detection value is smaller than the target repairing value, judging the soil and underground water to reach the standard, and if the detection value is larger than the target repairing value, judging the soil and underground water to be unqualified, adding the secondary agent. And after the self-inspection reaches the standard, the soil and the underground water are to be inspected and detected.
Further, the extraction treatment of the underground water polluted area in the area B comprises the following steps:
the method comprises the following steps: building a pumping well in a pollution range, namely building the well by using a drilling machine, wherein a well perforated pipe is arranged in the depth range of a polluted aquifer and is deep to a pollution depth bottom plate;
step two: and (4) numbering the pumping wells from the center to the periphery of the pollution range, and numbering the pumping wells respectively, such as 1# and 2#.
Step three: the underground water is extracted, from the center to the periphery of the pollution range, the water suction pumps are sequentially started to pump the underground water, in the water pumping process, water is pumped from a central range 1# well, meanwhile, the water level change of other wells is observed, and when the water levels of other wells are obviously reduced, the peripheral water suction pumps are sequentially started to pump the water.
Step four: pumping underground water for collection, connecting a water pumping pipe to a water collecting tank, and pumping the underground water into the water collecting tank.
Step five: pumping underground water for disposal, connecting the water collecting tank with sewage treatment integrated equipment, starting the equipment to automatically add medicine, react, precipitate and the like.
Step six: and collecting the treated underground water, connecting a water outlet of the sewage treatment equipment with another water collecting tank, carrying out concentrated collection on the treated underground water, sampling and detecting, and using for allocating on-site remediation engineering medicaments after the treated underground water is qualified.
The detection data of the soil and underground water characteristic pollutants after the in-situ chemical oxidation remediation and the pumping treatment remediation are shown in tables 4 and 5.
TABLE 4 soil characteristic pollutant test data mg/kg after adding the agent
TABLE 5 detection result ug/L of characteristic pollutant of selected groundwater sampling point
According to the detection data, the repaired soil and underground water all reach the standard, and the repairing effect is good.
The pollution depth of the raw and auxiliary materials and the kerosene storage tank area in the pollution site is 5-14m, wherein 5-14m in the area A has soil pollution and underground water pollution, 5-14m in the area B has only underground water pollution, the main soil pollutants are benzene, 1, 2-dichloroethane, chlorobenzene, 1, 2-dichlorobenzene, 1, 4-dichlorobenzene, chloroform and petroleum hydrocarbon (C10-C16 and C17-C36), the main underground water pollutants are benzene, 1, 2-dichloroethane, chlorobenzene, 1, 2-dichlorobenzene, 1, 4-dichlorobenzene and chloroform, and the technical route is adopted according to the characteristics of the pollution site and the characteristics of the pollutants as follows:
the area A adopts an in-situ chemical oxidation method to repair soil and underground water, and the area needing to be repaired is 472m2Repairing earth volume of about 4248m3About 1061m for groundwater remediation3。
The area B adopts pumping treatment to repair the underground water, and the repair area is 356m2About 802m for groundwater remediation3。
In the early stage of repair work such as in-situ chemical oxidation, extraction treatment and the like, the site needs to be leveled, the convenience of surrounding transportation is ensured, and the access conditions of water and electricity are complete. The waterproof curtain at the maximum boundary of the pollution range is built, secondary pollution caused by close hydraulic connection between the inside and outside of the pollution range is prevented, meanwhile, the waterproof curtain is built, underground water outside the pollution range is isolated, the pollution range cannot be controlled, and the repair water quantity can be effectively controlled.
In the early stage of pumping and treating underground water, an extraction well is required to be built.
The on-site underground water extraction well system is mainly distributed in an underground water pollution area range, and extraction wells are distributed in a triangular mode from the center to the boundary of pollution plumes in the pollution range.
The drilling, well building and well washing methods are carried out according to geotechnical engineering investigation norm (B50021), water supply hydrogeological investigation norm (GB 50027) 2001, water supply hydrogeological drilling and well drilling operation regulation (CJJ 13-87), groundwater environment monitoring technical norm (HJT 164) 2004 and pollution site risk assessment technical guide rules (HJ 25.3-2014).
Construction principle of extraction well
a, selecting materials and selecting a well construction method according to the early-stage restoration depth and the site area, and improving the pumping efficiency of the polluted underground water.
b, the pumping wells are installed from a high pollution area to a low pollution area in sequence. The high pollution area is located in the middle of the pollution plume, and water can be pumped after the high pollution area is installed, so that underground water in a severe pollution area is prevented from diffusing to a low pollution area.
c, well construction waste liquid and scraps are forbidden to be recycled and are discarded at will.
Extraction well construction
The pumping well adopts a direct rotary drilling method, the diameter of an initial casing pipe adopted by a drilling machine is phi 200mm, the diameter change of the casing pipe is avoided as much as possible in the drilling process, and when the diameter change is required, the diameter of a final hole casing pipe is not less than phi 105 mm. The diameter of the adopted well pipe is phi 75-100 mm. Ensuring that the thickness of the enclosing and filling filter layer is not less than 50 mm. The drilling top angle deflection must not exceed 1 deg.. When the flushing liquid is adopted to drill in a rotary mode to form holes, clear water is used for drilling as much as possible, and other additives are forbidden; when the hole wall is unstable, a temporary sleeve is adopted for protecting the wall.
(iii) well pipe requirements
The PVC well material horizontal cutting type water filtering pipe is generally adopted, the width of the screen seam is determined according to the grain diameter of soil of a water-bearing stratum, and the site can use about 0.2mm or a wire winding embedded type filtering layer with the grain diameter not less than 80 meshes. The well pipes are preferably connected by screw threads, and sealing rings or teflon winding belts are added at the screw threads for sealing. Bonding with organic adhesives is prohibited. After the drill hole meets the design requirements, punching and slurry changing are carried out before the well pipe is put into the drill hole. When punching, the punching drill rod is put down to the bottom of the hole, and large amount of pump is used for punching and deslagging until rock slag in the hole is completely discharged.
From bottom to top, the well pipe is arranged according to a settling pipe, a water filter pipe and a solid pipe section, the groundwater restoration depth of the project is 5-14m, therefore, the settling pipe is buried by 14.0-14.5m, the water filter pipe is buried by 5-14m, and the solid pipe section is connected above the water filter pipe to the appropriate injection and monitoring operation height of the earth surface.
Fifthly, mounting a filter material layer
The periphery of the settling tube and the strainer tube needs to be filled with filter materials from bottom to top. The thickness of the enclosing and filling filter material is not less than 50 mm. The filter layer material is preferably put into the well hole together with clean water by using a guide pipe, and can also be slowly and uniformly filled into the gap between the well pipe and the well wall from the periphery of the well pipe by manpower. During installation, the depth of the top of the filter layer should be carefully checked and the amount of filter layer material used should be verified to ensure that the filter layer material is not bridged and to avoid voids that are destabilized by the annular filter layer.
Extraction well annular gap sealing
The thickness of the annular gap sealing layer is preferably sealed by cement and clay.
When cement slurry is used for packing, clay or bentonite layer with the thickness of at least 20cm is filled above the filtering layer to serve as a buffer layer, so that the cement slurry is prevented from entering the filter and the well through gravel. When clay is used for sealing, the cement should be slowly filled from the periphery of the well pipe in a semi-dry state. Rock fragments and material around the pumping well are strictly forbidden to be used as pumping well backfill material.
And the well is washed in time after the extraction well is completed. The well washing method can be carried out by gas stripping and water pumping.
In the well arrangement process, the overlapping area is increased by triangular point arrangement, and fig. 4 is a well arrangement schematic diagram of an extraction well.
Fig. 5 is an in-situ chemical oxidation profile plot.
In-situ chemical oxidation of soil and underground water of 5-14m in the area A:
(1) measuring line
According to the in-situ remediation area of the engineering polluted soil, the polluted boundary, the elevation, the drilling position and the like are positioned and measured with high precision according to the coordinate inflection point provided by design, and the inspection and acceptance are required to be managed after the measurement is completed.
(2) Hole distribution parameters of mixing pile
According to the repairing area of the polluted area, the injection holes of the mixing piles are designed to be distributed in a quincunx (regular triangle) mode, and the distribution schematic diagram of the injection points of the chemical oxidation is shown in figure 5. The arrangement of the mixing drilling intervals of the mixing piles comprehensively considers the influences of the mechanical mixing operation radius of the mixing drill bit, stratum information and the diffusion radius of the medicament, and the coverage range of the diffusion radius is required to have no blind area where the medicament cannot reach.
The layout parameters of the deep stirring injection repair concrete drill holes are shown in a table 6, the stirring radius of a stirring pile drill bit is 0.35m, and according to the field stirring pilot test result, the medicament can diffuse a distance out of the stirring drill holes, so that the medicament diffusion radius is 0.59 m, and the drill hole distance is designed to be 1.0 m.
TABLE 6 in-situ agitation remediation of borehole layout parameters
And (3) pumping underground water of 5-14m in the B area:
(1) selection of the Process
The project adopts the underground water well pumping treatment mode, namely pumping underground water by using the pumping well, and repairing polluted underground water by using the sewage treatment equipment again, so that the repairing agent is favorably in full contact reaction with the underground water, and the repairing purpose is achieved.
(2) Determination of well spacing
By analogy with other sites and combining the experience of groundwater remediation engineering of other sites in our unit, the interval of the groundwater extraction wells of the project is adjusted to be 5.0m, and the project is reasonable. In the specific construction process, a waterproof curtain is arranged on the periphery of a pollution boundary of a field area, the underground water is extracted by an extraction well and sent to a sewage treatment system for disposal, the extraction process is repeated continuously, and the underground water in the influence radius range can completely reach a repair target value.
(3) Distribution mode
By adopting honeycomb distribution (similar to equilateral triangle distribution), the adjacent well points have certain overlap, and all polluted areas can be effectively covered.
(4) Rationality of the repair mode
The project adopts the repair technology of underground water well extraction, and the repair technology comprises the following steps: extracting underground water to a water storage tank, pumping the underground water to a sewage treatment device through a water pump, adding a Fenton reagent with the pH =12 into a reaction tank for fully mixing, adding cationic PAM into the reaction tank for flocculation and precipitation after mixing, and overflowing the effluent after the effluent reaches the standard and is filtered by a ceramic membrane from a tail end water tank to produce water.
The operating records of the sewage treatment plant are shown in Table 7.
TABLE 7 summary of operating records of a wastewater treatment facility
| Volume m of treated sewage3 | Time of treatment | 27% hydrogen peroxide L | Ferrous sulfate dosage kg | 15% of liquid caustic soda dosage L | The dosage of calcium oxide is |
3 per mill cationic PAM L | Use of |
| 802 | 2016.12.6-2016.12.21 | 20754 | 879 | 4395 | 4395 | 5999 | Drug formulation |
27% of hydrogen peroxide is added, and the addition amount is 2.0% -3.0%; the addition amount of ferrous sulfate is 0.05 to 0.2 percent; 15% of liquid caustic soda is added, and the addition amount is 0.3% -1.0%; the addition amount of calcium oxide is 0.3 to 1.0 percent; 3 per mill of cationic PAM is added in 0.5 to 1.0 percent.
The effect is as follows: the content of various pollutants after treatment reaches the requirements of site soil and underground water remediation target values.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (2)
1. The method for remedying the organic contaminated soil and the underground water is characterized by comprising an area A and an area B, wherein the area A and the area B are adjacent, and the pollutants of the soil and the underground water are organic pollutants; the organic pollutants are one or more of benzene, 1, 2-dichloroethane, chlorobenzene, 1, 4-dichlorobenzene, 1, 2-dichlorobenzene and chloroform;
the treatment method comprises two parts, namely, (1) a superposed polluted area of the soil and the underground water in the area A adopts an in-situ chemical oxidation restoration technical method; and (2) in the B area, only underground water pollution areas exist, a water-stopping curtain is built before in-situ chemical oxidation and extraction treatment by adopting an extraction treatment technical method, and the water-stopping curtain is built at the maximum boundary of the pollution range;
the injection drilling holes of the mixing pile machine in the area A are distributed in a quincunx or regular triangle mode;
in the early stage of the pumping treatment work of the underground water in the area B, a pumping well is required to be constructed, and the pumping well is installed from a high pollution area to a low pollution area in sequence; the high-pollution area is positioned in the middle of the pollution plume, and water is pumped after the high-pollution area is installed; the well arrangement process of the B area is in a triangular distribution mode;
the superposed polluted area of the soil and the underground water in the area A refers to the area in a specified pollution depth range, the pollution of the soil and the pollution of the underground water exist, and the pollutants in the soil and the underground water are treated by the same technology in the treatment process; the fact that only the underground water pollution area exists in the area B means that underground water pollution exists but soil pollution does not exist in the specified pollution depth range of the area;
the existing soil pollution and the existing underground water pollution mean that pollution factors contained in soil or underground water in the area exceed the in-site restoration target value;
the in-situ chemical oxidation treatment method for the superposed polluted area of the soil and the underground water in the area A comprises the following steps,
the method comprises the following steps: detecting the total amount of pollutants, namely respectively sampling and detecting soil and underground water in a polluted area by using a drilling machine, and detecting the total amount of field organic pollutants;
step two: weighing the agent, namely respectively detecting the concentration of underground water and field organic pollutants in soil according to the first step, and weighing the oxidizing agent;
step three: preparing a medicament, namely preparing the medicament into a saturated aqueous solution, and carrying out the next operation when the medicament is fully dissolved in a medicament tank;
step four: injecting the medicament, namely injecting the medicament into the polluted soil by using a stirring pile machine, and simultaneously assisting with a stirring function to promote the injected medicament to be fully and uniformly mixed with the polluted soil and simultaneously uniformly mix the medicament with underground water in soil pores;
step five: injecting the agent into soil and underground water, and standing for 5-7 days;
step six: respectively sampling and detecting soil and underground water in the area after 5-7 days of maintenance;
step seven: checking whether the treated soil and underground water reach the standard or not, comparing the detection data of the soil and underground water after the agent is added with the target repairing value of each pollutant in the field, if the detection value is smaller than the target repairing value, judging the soil and underground water to reach the standard, and if the detection value is larger than the target repairing value, judging the soil and underground water to be unqualified, adding the secondary agent, and checking and detecting the soil and underground water after the soil and underground water reach the standard;
the in-situ chemical oxidation treatment method adopts sodium persulfate after alkali excitation as a medicament;
the method for pumping and treating the groundwater pollution area in the area B comprises the following steps: building a pumping well in a pollution range, namely building the well by using a drilling machine, wherein a well perforated pipe is arranged in the depth range of a polluted aquifer and is deep to a pollution depth bottom plate;
step two: numbering the pumping wells, and numbering the pumping wells from the center to the periphery of the pollution range;
step three: extracting underground water, namely starting water suction pumps in sequence from the center to the periphery of a pollution range to pump the underground water, wherein in the process of pumping the water, the first well in the center range pumps the water, meanwhile, observing the water level change of other wells, and when the water levels of other wells are obviously reduced, starting the peripheral water suction pumps in sequence to pump the water;
step four: pumping underground water for collection, connecting a water pumping pipe to a water collecting tank, and pumping the underground water into the water collecting tank;
step five: pumping underground water for disposal, connecting a water collecting tank with sewage treatment integrated equipment, starting the equipment to automatically add medicine, react and precipitate;
step six: collecting treated underground water, connecting a water outlet of the sewage treatment integrated equipment with another water collecting tank, carrying out centralized collection on the treated underground water, sampling and detecting, and using the collected underground water for reagent allocation of on-site remediation engineering after the underground water is qualified;
the extraction treatment technology is mainly characterized in that a pumping well is arranged in a pollution range, the extraction technology is adopted to extract a pollution medium to the sewage treatment integrated equipment for treatment, and the sewage treatment integrated equipment mainly adopts a method of adding Fenton with the pH =11 for treatment.
2. The method according to claim 1, wherein the in-situ chemical oxidation treatment is carried out by injecting an oxidizing agent into the soil with a mixing pile machine while mixing the oxidizing agent with the contaminated medium.
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| CN108046404B (en) * | 2017-12-20 | 2020-04-10 | 浙江省环境保护科学设计研究院 | In-situ chemical oxidation remediation method for organic-polluted underground water |
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| CN108480388A (en) * | 2018-03-16 | 2018-09-04 | 昆明理工大学 | A kind of method of repairing organic polluted soil |
| CN108856275A (en) * | 2018-07-03 | 2018-11-23 | 南京万德斯环保科技股份有限公司 | A method for remediating organic pollutants in polluted soil and groundwater |
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| CN112570434A (en) * | 2020-11-26 | 2021-03-30 | 浙江风玉顺环保科技有限公司 | Prevention and treatment method for soil and underground water pollution in-situ injection well remediation system |
| CN114354786A (en) * | 2021-12-25 | 2022-04-15 | 生态环境部南京环境科学研究所 | A method for analyzing the spatial distribution of benzene series in groundwater at polluted sites based on pollution plumes |
| CN115156270A (en) * | 2022-07-25 | 2022-10-11 | 天津华勘环保科技有限公司 | Method for repairing groundwater in pollution area of green belt |
| CN115722525A (en) * | 2022-12-23 | 2023-03-03 | 中地宝联(北京)国土资源勘查技术开发集团有限公司 | A method for in-situ filtration and suction treatment of mine solid waste or soil heavy metals |
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| CN119406906A (en) * | 2024-11-15 | 2025-02-11 | 森特士兴环保科技有限公司 | A method for controlling and removing pollution sources in groundwater organic pollution sites |
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| CN105032916B (en) * | 2015-06-08 | 2018-02-16 | 中节能大地（杭州）环境修复有限公司 | The in-situ injection extracting moisturizing circulation disposal system and combined remediation method of a kind of organic material contaminated soil and underground water |
| CN105964677B (en) * | 2016-06-23 | 2022-03-01 | 北京建工环境修复股份有限公司 | In-situ chemical oxidation high-pressure injection optimization restoration method for soil and underground water |
| CN206232569U (en) * | 2016-11-29 | 2017-06-09 | 北京高能时代环境技术股份有限公司 | Underground water pollution place pump-and-treat system and biological synthesis repair system |
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