CN104368591A - Periodic composite repair device of arsenic polluted soil - Google Patents
Periodic composite repair device of arsenic polluted soil Download PDFInfo
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- CN104368591A CN104368591A CN201410438917.XA CN201410438917A CN104368591A CN 104368591 A CN104368591 A CN 104368591A CN 201410438917 A CN201410438917 A CN 201410438917A CN 104368591 A CN104368591 A CN 104368591A
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Abstract
The invention belongs to the technical field of soil restoration, and in particular relates to a periodic composite repair device of arsenic polluted soil, the periodic composite repair device includes an electric field generating module, a vegetation restoration layer, a soil PH regulating module and a surfactant spraying module, the electric field generating module includes a power supply and an anode chamber and a cathode chamber, the anode chamber and the cathode chamber are arranged under the ground; the vegetation restoration layer is arranged on the surface layer of a to-be-repaired soil region, the restoration vegetation is ciliate desert-grass, the soil PH regulating module sprays a PH adjusting solution to the anode chamber, the cathode chamber and the to-be-repaired soil region, and the surfactant spraying module sprays a surfactant to the surfactant spraying module. Every steps are closely linked, by the manner of determination of periodic circulation on the basis of the detection value, unnecessary time and cost waste can be avoided, soil and electrode chamber PH can be regulated in real time, the ratio of an acid and alkali liquid tank can be regulated by an automatic control device, the stability is high, arsenic is repaired completely, and finally more than 98% of the arsenic can be repaired.
Description
Technical field
The invention belongs to soil remediation equipment technical field, be specifically related to a kind of As polluted soil variable period complex repairation device.
Background technology
China is that arsenic pollutes one of more serious country, and arsenic pollutes except from except chemical industry and agricultural production, more has a large amount of arsenic to abandon from Japanese aggression against China war after World War II and is embedded in the lower chemical weapons of soil.Arsenic is a kind of carcinogenic, teratogenesis element, and polluted-water and soil cause grave danger can to the mankind and ecological environment, and therefore China has comparatively early carried out the research of all kinds of arsenic removal.
The recovery technique of conventional As polluted soil mainly comprises following several:
1, stable curing method: the pollution level of the polluter of first analyzing and processing, proportioning administers medicament targetedly again, the medicament 10 ~ 30% good with proportioning by arsenic contaminated soil is mixed, adds mixing water and stir 3 ~ 5 minutes in mixer, discharge health 3 ~ 5 days classified utilization.Heavy metal can be wrapped in crystallization like this.
2, engineering measure method: engineering measure mainly comprises soil moved in improve the original, soil removal and replacement and deep ploughing and digs.Soil removal and replacement is taken contaminated soil away exactly, changes to new clean soil.Soil moved in improve the original method is in contaminated soil, add a large amount of clean soils, covers top layer or mixing, and pollutant levels are reduced.Dig and the pollutant being gathered in top layer can be made to be distributed to deep layer, reach dilution and the object from process.
3, physical chemistry repairing method: physical chemistry reparation mainly includes soil washing, Vitrification, electrochemical process etc.Soil washing utilizes eluent drip washing contaminated soil, makes the heavy metal in solid phase of soil transfer in liquid phase of soil, reduces pollutant toxicity.Vitrification uses electrical heating at the scene, melted by contaminated soil, forms stiff glass body technique that is chemically inert, non-diffusing after cooling.Electrochemical process is that the electrokinetic effects utilizing extra electric field to produce drive pollutant in soil along direction of an electric field directional migration.The pollutant of enrichment can be focused at electrode district or is separated.Not high for permeability, the arsenic in the clayed soil of conductibility difference, can destroy the principle of metal-soil key according to electric current, can Applied Electrochemistry method be removed.
4, phytoremediation: phytoremediation utilizes certain Plants to purify by heavy metal and/or organic pollution as crude oil, solvent and be polymerized hydrocarbon chemicals contaminated soil, precipitation and water body.Phytoremediation can be divided into plant extraction by its mechanism of repairing and process, plant is fixed, phytovolatilization, root system filter, plant degradation.Wherein, plant extraction refers to and utilizes root system of plant absorb soil contaminant and be transported to plant shoot, is reached a kind of method removing pollutant in soil by harvesting overground part material.
Above-mentioned pollution treatment method respectively has advantage, but also all there is certain defect, lack special equipment exactly, repair mode is single, effectively can only process for the arsenic pollution condition of a certain specific pollution concentration, once exceed its corresponding disposal ability, then treatment effect greatly weakens.Meanwhile, after have employed specific restorative procedure, adaptability to changes is poor, cannot tackle, cause remediation efficiency to decline, drop into larger repairing effect limited for the news such as pollution again.And picture engineering measure method etc., transhipment soil also easily causes secondary pollution.
Summary of the invention
1. invent technical problem to be solved
Object of the present invention, providing a kind of As polluted soil variable period complex repairation device, lacks special equipment to solve in above-mentioned soil remediation, the problem that remediation efficiency is lower, solves the arsenic pollution problem in soil targetedly.
2. technical scheme
For achieving the above object, As polluted soil variable period complex repairation device provided by the invention, comprises electric field generation module, vegetation repair layer, P in soil H adjustment module and surfactant spray module,
Described electric field generation module comprises power supply and is arranged on anode chamber and the cathode chamber of below ground, electric field generation module is arranged along the subsurface flow direction of soil region to be repaired, and anode chamber is arranged on the upstream position in subsurface flow direction, cathode chamber is arranged on the downstream position in subsurface flow direction;
Described vegetation repair layer is arranged in the top layer of soil region to be repaired, and reparation vegetation is ciliate desert-grass;
Described P in soil H adjustment module antianode room, cathode chamber and soil region to be repaired spray PH regulate solution;
Described surfactant spray module treats rehabilitating soil region spray surfactant.
Above-mentioned As polluted soil variable period complex repairation device, further, also comprise porous barrier, described porous barrier is arranged vertically on soil region periphery to be repaired.
Above-mentioned As polluted soil variable period complex repairation device, further, described P in soil H adjustment module comprises sour fluid reservoir, alkali fluid reservoir, first automaton, second automaton, first multi-channel peristaltic pump, anode buffer solution injector, negative electrode cushioning liquid syringe, second multi-channel peristaltic pump and cushioning liquid spray thrower, described sour fluid reservoir, alkali fluid reservoir respectively with the first automaton, second automaton is communicated with, first automaton is by the first multi-channel peristaltic pump and anode buffer solution injector, negative electrode cushioning liquid syringe is communicated with respectively, second automaton is communicated with cushioning liquid spray thrower by the second multi-channel peristaltic pump.
Above-mentioned As polluted soil variable period complex repairation device, further, described surfactant spray module comprises fluid reservoir, timing means, vavuum pump, spray pipe network, and described fluid reservoir is connected to vavuum pump by timing means, and vavuum pump is communicated with spray pipe network.
Above-mentioned As polluted soil variable period complex repairation device, further, also comprises PH checkout gear, and the PH of described PH checkout gear antianode room, cathode chamber and soil region to be repaired detects.
Above-mentioned As polluted soil variable period complex repairation device, further, described PH checkout gear comprises anode chamber PH detector, cathode chamber PH detector, PH detector, anode chamber PH detector, cathode chamber PH detector are connected with the first automaton, and PH detector is connected with the second automaton.
3. beneficial effect
Adopt technical scheme provided by the invention, compared with prior art, there is following beneficial effect:
(1) each step of system is closely connected, and judges circular round-robin manner according to detected value, avoids unnecessary time and cost waste; Prosthetic device equipment arranges compact, regulates the PH of soil and electrode chamber in real time, and regulate acid, alkali liquor storage tank proportioning by automaton, stability is high.
(2) plant and electronic combining are the complementary modes of one, and electric field action can strengthen the root absorption of plant, fortification of plants root chemical reaction; Meanwhile, the electric field action resistance in soil is comparatively large, and pollutant can not move to negative electrode smoothly from anode sometimes, and therefore plant root effectively can absorb pollutant, without the need to requiring that contaminant transportation is to terminal.Be aided with surfactant simultaneously, chemical reaction in soil can be promoted, accelerate plant roots absorption rate.
(3) spray pipe network is laid by side on the ground, to soil water spray, can shift to an earlier date moistening soil, promotes that root system of plant absorbs.
(4) the selective plantation of ciliate desert-grass makes full use of subsurface flow feature, saves great amount of cost while ensureing repairing effect.
(5) the present invention can repair on a large scale, and prosthetic device can arrange many groups and be listed in soil, coordinates phytoremediation, expands repair coverage, improves remediation efficiency.
(6) the present invention's major part device is intelligent automatic control system, need cultivate plant and gather in, greatly reduce human resources, improve automatic operating level for artificial.
(7) present system flexibility is strong, can change circular round-robin manner according to testing result, thorough to arsenic reparation, and final reparation can reach more than 98%.
Accompanying drawing explanation
Fig. 1 is As polluted soil variable period complex repairation device schematic diagram of the present invention.
Label declaration in schematic diagram: 1-power supply, 1-1 anode electrode, 1-2 cathode electrode, 2-1-anode buffer solution injector, 2-2-negative electrode cushioning liquid syringe, 3-1-anode chamber PH detector, 3-2-cathode chamber pH detector, 4-1-anode chamber, 4-2-cathode chamber, 5-porous barrier, 6-pH detector, 7-cushioning liquid spray thrower, 8-1-acid fluid reservoir, 8-2-alkali fluid reservoir, 9-1-first single channel peristaltic pump, 9-2-second single channel peristaltic pump, 10-1-first automaton, 10-2-second automaton, 11-1-first multi-channel peristaltic pump, 11-2-second multi-channel peristaltic pump, 12-fluid reservoir, 13-timing means, 14-vavuum pump, 15-voltage controller, 16-vegetation repair layer, 17-spray pipe network, 18-white space.
Fig. 2 is loop cycle schematic diagram of the present invention.
Fig. 3 is vegetation repair layer schematic diagram of the present invention.
Detailed description of the invention
For understanding content of the present invention further, below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.
embodiment 1
As shown in Figure 1, As polluted soil variable period complex repairation device of the present invention, comprises electric field generation module, vegetation repair layer, P in soil H adjustment module and surfactant spray module.
Described electric field generation module comprises power supply 1 and is arranged on anode chamber 4-1 and the cathode chamber 4-2 of below ground, anode electrode 1-1, cathode electrode 1-2 are separately positioned in anode chamber 4-1 and cathode chamber 4-2, electric field generation module is arranged along the subsurface flow direction of soil region to be repaired, and anode chamber 4-1 is arranged on the upstream position in subsurface flow direction, cathode chamber 4-2 is arranged on the downstream position in subsurface flow direction, direction of an electric field and the subsurface flow direction of formation are basically identical, to reach the diffusion of better solution, repairing effect.
Described vegetation repair layer 16 is arranged in the top layer of soil region to be repaired, and reparation vegetation is ciliate desert-grass.
Described P in soil H adjustment module antianode room 4-1, cathode chamber 4-2 and soil region to be repaired spray PH regulates solution, described P in soil H adjustment module specifically comprises sour fluid reservoir 8-1, alkali fluid reservoir 8-2, first automaton 10-1, second automaton 10-2, first multi-channel peristaltic pump 11-1, anode buffer solution injector 2-1, negative electrode cushioning liquid syringe 2-2, second multi-channel peristaltic pump 11-2 and cushioning liquid spray thrower 7, described sour fluid reservoir 8-1 by the first single channel peristaltic pump 9-1 respectively with the first automaton 10-1, second automaton 10-2 is communicated with, alkali fluid reservoir 8-2 by the second single channel peristaltic pump 9-2 respectively with the first automaton 10-1, second automaton 10-2 is communicated with, first automaton 10-1 is by the first multi-channel peristaltic pump 11-1 and anode buffer solution injector 2-1, negative electrode cushioning liquid syringe 2-2 is communicated with respectively, second automaton 10-2 is communicated with cushioning liquid spray thrower 7 by the second multi-channel peristaltic pump 11-2.
Described surfactant spray module treats rehabilitating soil region spray surfactant, specifically comprise fluid reservoir 12, timing means 13, vavuum pump 14, spray pipe network 17, described fluid reservoir 12 is connected to vavuum pump 14 by timing means 13, and vavuum pump 14 is communicated with spray pipe network 17.
Second control device 10-2 is also connected with timing system 13, power supply 1 installs voltage controller 15 additional simultaneously, second automaton 10-2 is connected with voltage controller 15, by the second automaton 10-2 control voltage controller 15, and then control the open and close of power supply 1, realize the automation of system.
In the present embodiment, be also provided with porous barrier 5, described porous barrier 5 is arranged vertically on soil region periphery to be repaired.
embodiment 2
The present embodiment increases PH checkout gear on the basis of embodiment 1, and the PH of antianode room, cathode chamber and soil region to be repaired detects.
As shown in Figure 1, PH checkout gear comprises anode chamber PH detector 3-1, cathode chamber PH detector 3-2, PH detector 6, anode chamber PH detector 3-1, cathode chamber PH detector 3-2 are connected 10-1 with the first automaton and connect, and PH detector 6 is connected 10-2 with the second automaton.
As shown in Figure 3, vegetation repair layer 16 can adopt the mode of selective plantation, investigation contaminated zone arsenic pollution concentration, under base area, water stream characteristics and arsenic pollution concentration distribute and Electric Field Distribution situation selective plantation ciliate desert-grass, planting area is in the distribution of many group side-by-side cross networks, and due to electric field action, pollutant in soil is moved with electric field action, in this, as the basis on location of vegetation repair layer 16 covering position, white space 18 is the distributed areas that pollution concentration is lower.
embodiment 3
Device of the present invention, concrete using method is as follows:
Step 1, transplant ciliate desert-grass at soil region to be repaired, form vegetation repair layer 16.Preferably cultivate ciliate desert-grass in nursery, laboratory, breeding method is as follows: ciliate desert-grass sporophyll is placed in culture dish sterile culture, temperature 25 DEG C, intensity of illumination 1500 ~ 2000Lx, illumination cultivation time 10 ~ 12h/d, root media is transferred to after germinateing, be transplanted to after taking root and cultivate in turfy soil, preservative film covers 20d, keeps moistening, after seedling age reaches 30 ~ 40 days, for subsequent use.
Step 2, electrochemical rehabilitation:
Step 2.1, opening power 1, voltage controller 15 control voltage gradient is 3 ~ 5V/cm.
Surfactant in step 2.2, fluid reservoir 12 controls to be delivered to spray pipe network 17 through vavuum pump 14 by timing system 13 and sprays, and timing system 13 is set to often spray every 12 ~ 16 hours, closes 8 hours.
Step 2.3, the first automaton 10-1 and the second automaton 10-2 measure the pH detected value obtained in anode chamber 4-1, cathode chamber 4-2, soil region to be repaired respectively by anode chamber PH detector 3-1, cathode chamber PH detector 3-2, PH detector 6, and the pH value adjustment of respective regions is carried out according to real-time testing result, keep the balance of pH value, substantially about 7.
By the pH value of soil Real-Time Monitoring, first automaton 10-1, the second automaton 10-2 calculate acid, alkali cushioning liquid proportioning, after control cushioning liquid acid fluid reservoir 8-1, alkali fluid reservoir 8-2 carry quantitative cushioning liquid mixing, then be delivered to region to be regulated respectively by the first multi-channel peristaltic pump 11-1, the second multi-channel peristaltic pump 11-2.
Step 2.4, reparation, after 25 ~ 30 days, are repaired complete, close whole system.Ciliate desert-grass in harvesting vegetation repair layer 16, harvesting toothing 5 ~ 10cm, obtains ciliate desert-grass accessory pinna, enters step 3.
Step 3, reparation result detect:
Detect the arsenic concentration in ciliate desert-grass accessory pinna, and judge according to testing result.
If ciliate desert-grass accessory pinna arsenic concentration is less than or equal to 10mg/kg, then repair.
If ciliate desert-grass accessory pinna arsenic concentration is more than or equal to 500mg/kg, then root out the ciliate desert-grass for the treatment of in vegetation repair layer 16, return step 1 and re-start reparation.
If ciliate desert-grass accessory pinna arsenic concentration is greater than 10mg/kg and is less than 500mg/kg, then enter step 4.
Step 4, naturally repair: to step 2.4 gather in after treat that vegetation repair layer 16 uses a small amount of phosphate fertilizer, consumption is about 200kg/hm
2, after allowing ciliate desert-grass grow 25 ~ 30 days, the ciliate desert-grass in vegetation repair layer 16 is treated in harvesting again, and harvesting toothing 5 ~ 10cm, by the ciliate desert-grass accessory pinna obtained after harvesting, returns step 3.
Above-mentioned surfactant is rhamnolipid, and its concentration is 0.3 ~ 0.5 of arsenic concentration in soil region to be repaired, is generally 500 ~ 1000mg/L, and the amount of surfactant leacheate is 0.1 ~ 0.5m
3/ (dim
2).
The mixed liquor of solution to be mass fraction the be NaOH of 10% and the CaO of 90% in alkali fluid reservoir, in sour fluid reservoir, solution is acetic acid.
Schematically above be described the present invention and embodiment thereof, this description does not have restricted, and also just one of the embodiments of the present invention shown in accompanying drawing, actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from the invention aim, designing the frame mode similar to this technical scheme and embodiment without creationary, all should protection scope of the present invention be belonged to.
Claims (6)
1. an As polluted soil variable period complex repairation device, is characterized in that: comprise electric field generation module, vegetation repair layer, P in soil H adjustment module and surfactant spray module,
Described electric field generation module comprises power supply and is arranged on anode chamber and the cathode chamber of below ground, electric field generation module is arranged along the subsurface flow direction of soil region to be repaired, and anode chamber is arranged on the upstream position in subsurface flow direction, cathode chamber is arranged on the downstream position in subsurface flow direction;
Described vegetation repair layer is arranged in the top layer of soil region to be repaired, and reparation vegetation is ciliate desert-grass;
Described P in soil H adjustment module antianode room, cathode chamber and soil region to be repaired spray PH regulate solution;
Described surfactant spray module treats rehabilitating soil region spray surfactant.
2. As polluted soil variable period complex repairation device according to claim 1, it is characterized in that: also comprise porous barrier, described porous barrier is arranged vertically on soil region periphery to be repaired.
3. As polluted soil variable period complex repairation device according to claim 1, it is characterized in that: described P in soil H adjustment module comprises sour fluid reservoir, alkali fluid reservoir, first automaton, second automaton, first multi-channel peristaltic pump, anode buffer solution injector, negative electrode cushioning liquid syringe, second multi-channel peristaltic pump and cushioning liquid spray thrower, described sour fluid reservoir, alkali fluid reservoir respectively with the first automaton, second automaton is communicated with, first automaton is by the first multi-channel peristaltic pump and anode buffer solution injector, negative electrode cushioning liquid syringe is communicated with respectively, second automaton is communicated with cushioning liquid spray thrower by the second multi-channel peristaltic pump.
4. As polluted soil variable period complex repairation device according to claim 1, it is characterized in that: described surfactant spray module comprises fluid reservoir, timing means, vavuum pump, spray pipe network, described fluid reservoir is connected to vavuum pump by timing means, and vavuum pump is communicated with spray pipe network.
5. As polluted soil variable period complex repairation device according to claim 3, is characterized in that: also comprise PH checkout gear, and the PH of described PH checkout gear antianode room, cathode chamber and soil region to be repaired detects.
6. As polluted soil variable period complex repairation device according to claim 5, it is characterized in that: described PH checkout gear comprises anode chamber PH detector, cathode chamber PH detector, PH detector, anode chamber PH detector, cathode chamber PH detector are connected with the first automaton, and PH detector is connected with the second automaton.
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| CN201410438917.XA CN104368591A (en) | 2014-09-01 | 2014-09-01 | Periodic composite repair device of arsenic polluted soil |
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| CN201410438917.XA CN104368591A (en) | 2014-09-01 | 2014-09-01 | Periodic composite repair device of arsenic polluted soil |
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| CN109226230A (en) * | 2017-07-10 | 2019-01-18 | 北京中毅工程科技有限公司 | Soil restoring device and method |
| CN109772876A (en) * | 2019-03-25 | 2019-05-21 | 北京大学深圳研究生院 | A kind of method that electric power coupling pepper planting repairs arsenic pollution farming land soil |
| CN112845559A (en) * | 2021-01-05 | 2021-05-28 | 清华大学 | System and method for deep layering treatment of heavy metal contaminated soil |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106424107A (en) * | 2016-10-15 | 2017-02-22 | 太原理工大学 | Device of leaching and electrokinetically remediating chromium slag stacking place by nanometer zero-valent iron and nickel |
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| CN109226230A (en) * | 2017-07-10 | 2019-01-18 | 北京中毅工程科技有限公司 | Soil restoring device and method |
| CN109772876A (en) * | 2019-03-25 | 2019-05-21 | 北京大学深圳研究生院 | A kind of method that electric power coupling pepper planting repairs arsenic pollution farming land soil |
| CN112845559A (en) * | 2021-01-05 | 2021-05-28 | 清华大学 | System and method for deep layering treatment of heavy metal contaminated soil |
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