CN109759434A - Contaminated site repair system and its in-situ remediation method for cohesive soil area - Google Patents

Contaminated site repair system and its in-situ remediation method for cohesive soil area Download PDF

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Publication number
CN109759434A
CN109759434A CN201910149660.9A CN201910149660A CN109759434A CN 109759434 A CN109759434 A CN 109759434A CN 201910149660 A CN201910149660 A CN 201910149660A CN 109759434 A CN109759434 A CN 109759434A
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China
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unit
contaminated site
water
thief zone
sewage treatment
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CN201910149660.9A
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Chinese (zh)
Inventor
陈求稳
马宏海
施文卿
陈宇深
林育青
陈诚
严晗璐
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Nanjing Hydraulic Research Institute of National Energy Administration Ministry of Transport Ministry of Water Resources
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Nanjing Hydraulic Research Institute of National Energy Administration Ministry of Transport Ministry of Water Resources
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Priority to CN201910149660.9A priority Critical patent/CN109759434A/en
Publication of CN109759434A publication Critical patent/CN109759434A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a kind of contaminated site repair system and its in-situ remediation method for cohesive soil area, which includes Thief zone unit, the unit that draws water, sewage treatment unit, washing unit;Thief zone unit bottom is provided with aqueduct;Unit draw water by being connected to the well construction of drawing water of Thief zone unit;Sewage treatment unit is connected with the unit that draws water, and the washing unit connect distribution with sewage treatment unit and is arranged in Pollution Field the earth's surface.Construction cost of the present invention is small, and ecology disturbance is low, and system can keep long-term automatic running after building up, and operating cost is low;It is easy in time to exclude eluent, the secondary pollution caused by contaminated site is small;No replacement is required infiltration wall, and installation is drawn water after unit, ground water circulation process is accelerated, and the reparation of contaminated site can more rapidly, be easily completed;This method can select different type eluent, the reparation suitable for complicated contaminated site for different type contaminated site.

Description

Contaminated site repair system and its in-situ remediation method for cohesive soil area
Technical field
The invention belongs to soil pollutions to repair field, be related to a kind of contaminated site soil in-situ recovery technique, and in particular to A kind of contaminated site repair system and its in-situ remediation method for cohesive soil area.
Background technique
With country's fast development in nearly 40 years in the past and the Expedite the application of recent national economy constructional transfer, because industry is looked forward to The contaminated site that industry is closed, stop, merge and shift and left is more than more than 50 ten thousand pieces, is thus generated to ecological environment, food safety and living environment Negative effect it is also further obvious.Multi-source, dirt compound, lasting, wide, amount is big is generally presented in the existing contaminated site in China Contaminate feature, wherein the combined pollution that inorganic heavy metal pollution and organic contamination coexist is particularly problematic.
Contaminated site recovery technique mainly includes soil improvement by importing soil from other places, fixation-stabilizing method, chemical oxidization method, thermal desorption method, plant Repairing method, Electroremediation method, elution method, permeable wall method etc..Although there are many recovery technique of soil, without a kind of reparation Technology can be directed to all contaminated soils, and the soil remediation limitation of single method is very big.Such as: although soil improvement by importing soil from other places administers effect Fruit is preferable, but soil very big to the disturbance of ecological environment and displaced still needs to handle;Fixation-stabilizing method is mainly for a huge sum of money Belong to contaminated soil, this method repairing effect is preferable, but repair after soil cannot be used for it is agricultural, and in rehabilitating soil be detained New substance;Chemical oxidization method is mainly for organic contamination soil, and the scope of application is very narrow, control expense is higher;Thermal desorption method master To be used to handle organic contamination place, soil purposes that treated is limited;Phytoremediation treatment effect is general and process cycle It is very long.Permeable wall method (PRB) and elution method are methods popular at this stage, and permeable wall method (PRB) is a kind of original position Processing technique, in thin solum and underground water, constructing one has permeability, the wall containing reaction material, polluted-water warp When crossing wall pollutant therein and reaction material within the walls occur physics, chemical reaction and be cleaned removing, but this method is over the ground Lower water flow field has very high requirement, and groundwater velocity, which reaches a certain level, could be applicable in this method, and PRB method replacement infiltration wall Cost is very big;Elution method is by the chemical/biological chemical solvent that can promote pollutant dissolution or migration in soil environment, in weight Power effect is lower or is injected into contaminated soil layer by head pressure forces leacheate, then again the solution containing pollutant It is extracted from soil, carries out the technology of separation and sewage treatment, have very high flexibility for different types of pollutant And the processing time is shorter, the disadvantage is that eluent cannot be discharged in time, is easy to cause secondary pollution to soil.It is looked forward in conjunction with Chinese industrial The feature of industry contaminated site combined pollution, single contaminated site recovery technique have been difficult to meet China's soil remediation at this stage It is required that, it should the technical method that exploitation ecology disturbance is smaller, processing capacity is stronger, the adaptability of technology is more flexible administers industrial enterprise Contaminated site.
Summary of the invention
Goal of the invention: in view of the problems of the existing technology, according to cohesive soil area Groundwater seepage characteristics, the present invention is mentioned For a kind of contaminated site in-situ remediation system suitable for cohesive soil area, using the system by artificially changing in contaminated site The ground water circulation in portion is precipitated pollutant and focuses on using pollutant with stream migration feature, and it is dirty to reach barrier contaminated site Contaminate the purpose of object diffusion, contaminated site reparation.
The present invention also provides a kind of contaminated site in-situ remediation methods suitable for cohesive soil area.
Technical solution: to achieve the goals above, a kind of contaminated site for cohesive soil area is repaired as described herein Complex system, including Thief zone unit, the unit that draws water, sewage treatment unit, washing unit;The Thief zone unit bottom is provided with Aqueduct;The unit that draws water is by being connected to the well construction of drawing water of Thief zone unit;The sewage treatment unit and the unit that draws water, The washing unit connect distribution with sewage treatment unit and is arranged in Pollution Field the earth's surface.
Wherein, the Thief zone unit makes contaminated site integral into low water level region, forms watershed, Pollution Field with the external world Underground water in ground carries polluter and constantly imports Thief zone region.Thief zone region is to change contaminated site perimetric penetration Performance is formed, and since sticky soil permeability is very weak, has natural water isolating, the present invention constructs similar in contaminated site surrounding The infiltration wall with high osmosis energy of PRB method, forms Thief zone region.
Preferably, the Thief zone unit is that contaminated site extends outwardly 1~2m, the preferential path of Thief zone unit Raising infiltration, low adsorption performance materials;Fill out undisturbed soil in Thief zone unit surface layer.
Preferably, the Thief zone unit is lower than pretreatment 0.5~1m of contaminated site pretreatment deep.
The purpose of Thief zone unit of the present invention is the underground water collected in contaminated site, mainly by Thief zone unit and aqueduct Composition, when cell operation of drawing water, Thief zone unit makes contaminated site integral into low water level region, forms watershed with the external world, dirty The underground water newly supplemented in dye place carries polluter and constantly imports the region, achievees the purpose that pollution captures.It is hypertonic Saturating unit control area area should not exceed 150m × 150m, and width 1m, Thief zone unit cutting depth is according to contaminated site Management goal depth determines, need to generally be lower than 0.5~1m of target controlled depth, and aqueduct is laid in lower section, and aqueduct generally uses Floral tube (floral tube is exactly the drilling of aqueduct appearance) enhancing subsurface flow general character, filling permeance property high (permeance property > 1m/d) For gravel mixed packing at away from ground 0.5m, rest part makes earth's surface restore to the original state using original state earthen backfill.For part Feature contaminated site (such as special producing workshop), should individually lay Thief zone unit, in order to avoid to other places when system is run Generate pollution.
Wherein, the pumped well setting is lower than (1) 0.5~1m of Thief zone unit in contaminated site ground water field downstream.
Preferably, the pumped well is connected to Thief zone unit, the borehole wall uses floral tube, and surrounding arranges strainer, filtrate;It draws water Well automatic water level controller is collected into after washing water and reaches sewage treatment unit immediately and handle to clean.
The unit that draws water connects Thief zone unit, is generally laid in below contaminated site ground water field, and main purpose is The contaminated site underground water collected is extracted out and is focused on, the unit that draws water is according to contaminated site concrete condition setting a bite at most mouth Pumped well, well depth of drawing water need to be lower than Thief zone unit at least 0.5m, to guarantee the low water level feature of contaminated site underground water.It takes out Well takes automatic water level water plug, stay-at-home without technical staff, and operator, which only needs to carry out simple training, can guarantee Whole system operates normally.
The unit that draws water is connected to sewage treatment unit, is mainly used to focus on the polluted underground water for unit extraction of drawing water, And clean underground water is delivered to washing unit, sewage treatment unit can be arranged according to contaminated site contamination characteristics to be automatically processed System.
Wherein, the washing unit uses flusher, can be by sewage treatment unit (3) treated water purification or new The water purification of supplement is directly or addition eluent is uniformly sprayed to contaminated site.
Washing unit uses flusher, directly or addition by sewage treatment unit treated water purification and the water purification of supplement Eluent is sprayed on contaminated site, reaches and accelerates contaminated site water circulation, and then accelerates pollutant with the purpose of stream migration effect. For special local place, the eluent for characteristic contamination can be taken.
Contaminated site in-situ remediation method of the present invention suitable for cohesive soil area, which is characterized in that including as follows Step:
(1) investigation pretreatment contaminated site size, pretreatment deep, pollution type, groundwater depth, ground water field etc. Information determines treatment range and system each unit installation position;
(2) it is excavated in Thief zone unit installation position, when being excavated to lower than at 0.5~1m of contaminated site pretreatment deep, In bottom, tiling aqueduct assists Thief zone unit water guide;
(3) unit installation site of drawing water is selected below ground water field, the unit that draws water is arranged according to place concrete condition Pumped well quantity;
(4) it installs Thief zone unit aqueduct and draws water after unit, it can be to being tamped at Thief zone unit excavation;
(5) contaminated site earth's surface uniformly arranges washing unit, and when guaranteeing system work, contaminated site soil can be contacted To eluent, washing unit is connected with sewage treatment unit;
(6) when system works, watershed is formed inside and outside Thief zone unit, the polluted underground water in contaminated site is in a steady stream It is constantly converged to Thief zone unit, the unit that draws water constantly pumps the polluted-water of convergence to sewage treatment unit Reason is delivered to washing unit after sewage treatment unit treated clean water body addition eluent, is uniformly sprayed to Pollution Field The elution to contaminated site is realized on ground.
Wherein, step (3) the pumped well quantity is that every 1600 square metres of contaminated site reparations need to arrange flatly, pumped well It using floral tube as the borehole wall, is vertically installed in Thief zone unit, depth is lower than Thief zone unit 0.5-1m, and top is higher by ground Face is connected with sewage treatment unit.
Wherein, tamped described in step for fill Thief zone, low adsorption performance materials, enhance its water penetration, tamp to When at 0.5~1m of ground, remainder is tamped with undisturbed soil, to restore earth's surface, reduce ecology influence.
The utility model has the advantages that compared with prior art, the present invention has the advantage that
Construction cost of the present invention is small, and ecology disturbance is low, and system can keep long-term automatic running after building up, and operating cost is low; Compared to existing Soil leaching restorative procedure, it is easier in time to exclude eluent using system and restorative procedure of the invention, The secondary pollution caused by contaminated site is small;Compared to existing PRB method, using system and restorative procedure of the invention without more Change infiltration wall, and installation is drawn water after unit, ground water circulation process is accelerated, and repairing for contaminated site can more rapidly, be easily completed It is multiple;This method can select different type eluent, the reparation suitable for complicated contaminated site for different type contaminated site.
Automation contaminated site elution for a long time can be achieved using system of the invention and the restorative procedure present invention, pass through reality Test the result shows that, the long-time that the present invention is not only suitable for contaminated site elutes reparation automatically, also be suitble to barrier chronic pollution place The diffusion of middle polluter, and work well.
Detailed description of the invention:
Fig. 1 is plan view of the present invention;
Fig. 2 is Figure 1A-A sectional schematic diagram;
Fig. 3 is pumped well schematic diagram of the present invention;
Fig. 4 is that (left side is pollutant scatter diagram, right part of flg under natural situation to 3 place ground water field schematic diagram of embodiment Be shown as implement the present invention after pollutant scatter diagram);
(left side is pollutant scatter diagram under natural situation to effect comparative simulation schematic diagram, right after Fig. 5 embodiment 3 the 365th day Side is illustrated as pollutant scatter diagram after the implementation present invention);
(left side is pollutant scatter diagram under natural situation to effect comparative simulation schematic diagram, right after Fig. 6 embodiment 3 the 730th day Side is illustrated as pollutant scatter diagram after the implementation present invention);
Effect comparative simulation schematic diagram after Fig. 7 embodiment 3 the 1000th day (left side is pollutant scatter diagram under natural situation, Right diagram is to implement pollutant scatter diagram after the present invention);
Effect comparative simulation schematic diagram after Fig. 8 embodiment 3 the 7300th day (left side is pollutant scatter diagram under natural situation, Right diagram is to implement pollutant scatter diagram after the present invention).
Specific embodiment
Embodiment 1
It is regional (groundwater level buried depth < 6m) in cohesive soil, hydrogeological investigation is carried out to existing contaminated site, is investigated thoroughly Pollution type, groundwater level and the ground water field of contaminated site, the contaminated site range and depth to be administered of determination.
As shown in Figure 1-3, a kind of contaminated site repair system for cohesive soil area, including Thief zone unit 1, draw water Unit 2, sewage treatment unit 3, washing unit 4;It constructs Thief zone unit 1 in the contaminated site of the delimitation 1~2m that extends outwardly and makes Contaminated site forms watershed integral into low water level region, with the external world, and it is continuous that the underground water in contaminated site carries polluter Ground import Thief zone region need to select different eluents for different contaminated sites, can with Thief zone unit 1 by its every It opens, to facilitate the processing of subsequent contamination object, 1 cutting depth of Thief zone unit is determined according to contaminated site management goal depth, one As need lower than 0.5~1m of target controlled depth.It is hypertonic that sand gravel mixture etc. can be filled in the preferential path of Thief zone unit 1 Thoroughly, for low adsorption performance materials at away from ground 0.5m, rest part makes earth's surface restore to the original state using original state earthen backfill.In order to increase The flowing of contaminated site water, in Thief zone unit bottom aqueduct 5, aqueduct 5 generally uses floral tube;Unit 2 draw water by connecting Pumped well 6 to Thief zone unit 1 forms;The sewage treatment unit 3 and the unit 2 that draws water, main purpose will be collected The extraction centralized processing of contaminated site underground water, the unit that draws water are arranged 1 mouthful of at most mouth pumped well according to contaminated site concrete condition, take out Well depth need to be lower than Thief zone unit at least 0.5m, to guarantee the low water level feature of contaminated site underground water.Pumped well 6 is taken Automatic water level water plug, stay-at-home without technical staff, operator, which only needs to carry out simple training, can guarantee whole system It operates normally.6 borehole wall of pumped well uses floral tube, and surrounding arranges strainer, filtrate;The automatic water level controller of pumped well 6, is collected into Sewage treatment unit 3 is reached after washing water immediately to handle to clean.Sewage treatment unit 3 is mainly used to focus on the unit that draws water The polluted underground water of 2 extractions, and clean underground water is delivered to washing unit 4, sewage treatment unit 3 can be according to contaminated site Automated processing system is arranged in contamination characteristics.Washing unit 4 is connected distribution setting with sewage treatment unit 3 in pretreatment Pollution Field Total 1 surface of Thief zone unit of ground surface.Washing unit 4 uses flusher, by treated the water purification of sewage treatment unit 3 and new The water purification of supplement is directly or addition eluent is uniformly sprayed to contaminated site.Such as contaminated site upper left is heavy metal pollution field Ground, upper right are organic contamination place, and lower section is general contaminated site, when site remediation, can be sprayed in top left region and right regions The different eluents that addition is directed to pollutant are spilt, water purification is sprayed in lower section.
Embodiment 2
The contaminated site in-situ remediation method in cohesive soil area
(1) investigation contaminated site size to be treated, pretreatment deep, pollution type, groundwater depth, subsurface flow The information such as field, determine treatment range and system each unit installation position;
(2) it is excavated in 1 installation position of Thief zone unit, when being excavated to lower than at 0.5~1m of contaminated site pretreatment deep, In bottom, tiling aqueduct 5 assists Thief zone unit water guide;
(3) 2 installation site of unit of drawing water is selected below ground water field, the unit that draws water (2) is according to place concrete condition Arrange 6 quantity of pumped well;In general, 6 quantity of pumped well is that every 1600 square metres of contaminated site reparations need to arrange flatly, pumped well 6 use floral tube as the borehole wall, are vertically installed in Thief zone unit 1, and depth is lower than Thief zone unit 10.5-1m, and top is high Ground is connected with sewage treatment unit 3 out.
It (4), can be to being filled out at 1 excavation of Thief zone unit after installing Thief zone unit 1, aqueduct 5 and the unit 2 that draws water Real, filler selects the Thief zones, low adsorption performance materials such as sand gravel mixture, enhances its water penetration, tamps to apart from ground When at 0.5~1m, remainder is tamped with undisturbed soil, to restore earth's surface, reduce ecology influence;
(5) contaminated site earth's surface uniformly arranges washing unit 4, and when guaranteeing system work, contaminated site soil can be connect Contact that eluent, washing unit are connected with sewage treatment unit;
(6) when system works, watershed, the polluted underground water source in contaminated site are formed inside and outside Thief zone unit 1 Source constantly to Thief zone unit 1 converge, draw water unit 2 by the polluted-water of convergence constantly pump to sewage treatment unit 3 into Row processing is delivered to washing unit 4 after treated the clean water body addition eluent of sewage treatment unit 3, is uniformly sprayed to Contaminated site realizes the elution to contaminated site.
Embodiment 3
Certain airport, the oil of airport oil storage pool are continued to leak to water-bearing layer, be built here using MT3D module in MODFLOW software The numerical simulator of vertical ground water field and contaminant transportation rule.The oil storage pool shape is the rectangle of 250m × 150m, Depth 8m stores aircraft fuel oil, organic pollutant concentration 5000mg/L throughout the year.The region hydrogeology condition are as follows: respectively have up and down One layer of granule gravel aquifer (infiltration coefficient 0.0002m/d), centre have a clay and flour sand aquiclude that they are separated (infiltration system Number 1E-10), first layer and second layer head value are 19m, and third layer head value is 18m.The pollutant of this engineering is constant It is permeated to periphery, operating condition is obviously strictly in general contaminated site operating condition of the present invention.
Repair system is arranged according to the embodiment of the present invention 1 and 2 and carries out in-situ immobilization, after completing its design-build, actual measurement Scheme implement after 365 days, 730 days pollution control effects it is as shown in Figure 5, Figure 6, existing Groundwater Flow operating condition Imitating predict Scheme implement after the 1000th day, 7300 days regulation effects it is as shown in Figure 7, Figure 8.The result shows that present system can be prevented effectively The diffusion of polluter in contaminated site greatly reduces and chronic pollution is protected to export the contaminated model of contaminated site under operating condition Enclose, effect especially show using system and method for the present invention implement the 2nd year and later within the time limit of.

Claims (10)

1. a kind of contaminated site repair system for cohesive soil area, which is characterized in that including Thief zone unit (1), draw water Unit (2), sewage treatment unit (3), washing unit (4);Thief zone unit (1) bottom is provided with aqueduct (5);It is described The unit (2) that draws water is made of the pumped well (6) for being connected to Thief zone unit (1);The sewage treatment unit (3) and the unit that draws water (2) it connects, the washing unit (4) connect distribution with sewage treatment unit (3) and is arranged in Pollution Field the earth's surface.
2. the contaminated site repair system according to claim 1 for cohesive soil area, which is characterized in that described hypertonic Saturating unit (1) makes contaminated site integral into low water level region, forms watershed with the external world, the underground water in contaminated site carries dirty Dye substance constantly imports Thief zone region.
3. the contaminated site repair system according to claim 1 for cohesive soil area, which is characterized in that described hypertonic Saturating unit (1) is that contaminated site extends outwardly 1~2m, and Thief zone, low adsorption can be filled in the preferential path of Thief zone unit (1) Performance materials;Fill out undisturbed soil in Thief zone unit (1) surface layer.
4. the contaminated site repair system according to claim 1 for cohesive soil area, which is characterized in that described hypertonic Saturating unit (1) is preferably shorter than 0.5~1m of contaminated site depth.
5. the contaminated site repair system according to claim 1 for cohesive soil area, which is characterized in that described to draw water Well (6) setting is lower than (1) 0.5~1m of Thief zone unit in contaminated site ground water field downstream.
6. the contaminated site repair system according to claim 1 for cohesive soil area, which is characterized in that described to draw water Well (6) is connected to Thief zone unit (1), and the borehole wall uses floral tube, and surrounding arranges strainer, filtrate;Pumped well (6) is controlled with automatic water level Device is collected into after washing water and reaches sewage treatment unit (3) processing immediately to clean.
7. the contaminated site repair system according to claim 1 for cohesive soil area, which is characterized in that the elution Unit (4) uses flusher, and the water purification that can be supplemented by sewage treatment unit (3) treated water purification or newly directly or adds Eluent is added uniformly to be sprayed to contaminated site.
8. a kind of contaminated site in-situ remediation method suitable for cohesive soil area, which comprises the steps of:
(1) investigation contaminated site size to be treated, pretreatment deep, pollution type, groundwater depth, ground water field etc. Information determines treatment range and system each unit installation position;
(2) it is excavated in Thief zone unit (1) installation position, when being excavated to lower than at 0.5~1m of contaminated site pretreatment deep, Tile aqueduct (5) auxiliary Thief zone unit water guide for bottom;
(3) unit (2) installation site of drawing water is selected below ground water field, the unit that draws water (2) is according to place concrete condition cloth Set pumped well (6) quantity;
It (4), can be to being tamped at Thief zone unit (1) excavation after installing aqueduct (5) and the unit that draws water (2);
(5) contaminated site earth's surface is uniformly arranged washing unit (4), and when guaranteeing system work, contaminated site soil can be contacted To eluent, washing unit is connected with sewage treatment unit;
(6) when system works, Thief zone unit forms watershed inside and outside (1), and the polluted underground water in contaminated site is in a steady stream It is constantly converged to Thief zone unit (1), the unit that draws water (2) constantly pumps the polluted-water of convergence to sewage treatment unit (3) it is handled, is delivered to washing unit (4) after sewage treatment unit (3) treated clean water body addition eluent, uniformly The elution for being sprayed to contaminated site, realizing to contaminated site.
9. the contaminated site in-situ remediation method according to claim 8 suitable for cohesive soil area, which is characterized in that step Suddenly (3) described pumped well (6) quantity is that every 1600 square metres of contaminated site reparations need to arrange that flatly, pumped well (6) uses floral tube It as the borehole wall, is vertically installed in Thief zone unit (1), depth is lower than Thief zone unit (1) 0.5-1m, and top is above ground level It is connected with sewage treatment unit (3).
10. the contaminated site in-situ remediation method according to claim 8 suitable for cohesive soil area, which is characterized in that Step (4) is described to be tamped to fill Thief zone, low adsorption performance materials, is enhanced its water penetration, is tamped to apart from ground 0.5 When at~1m, remainder is tamped with undisturbed soil, to restore earth's surface, reduce ecology influence.
CN201910149660.9A 2019-02-27 2019-02-27 Contaminated site repair system and its in-situ remediation method for cohesive soil area Pending CN109759434A (en)

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Publication number Priority date Publication date Assignee Title
CN110756572A (en) * 2019-11-01 2020-02-07 彭秋霞 Sustainable soil remediation system and remediation method thereof

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CN1658984A (en) * 2002-06-07 2005-08-24 日本板硝子株式会社 Contamination diffusion preventing structure in contaminated area
CN102652956A (en) * 2012-04-19 2012-09-05 中国环境科学研究院 Chromium pollution soil in-situ leaching treatment method
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110756572A (en) * 2019-11-01 2020-02-07 彭秋霞 Sustainable soil remediation system and remediation method thereof

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