CN101357369A - Heterotopia repairing system of volatile organic pollution soil and processing method thereof - Google Patents
Heterotopia repairing system of volatile organic pollution soil and processing method thereof Download PDFInfo
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Abstract
The invention relates to a system for the ectopic restoration of volatile organic polluted soil and a disposing method thereof. The system for the ectopic restoration of the volatile organic polluted soil comprises a soil restoring bed, a ventilation pipeline system, a liquid charging system, a detecting system, an induced draught system and a closed-circuit tail gas collecting and disposing system. The soil restoring bed is a closed system. The ventilation pipeline system and the detecting system are arranged in the soil restoring bed. The liquid charging system is arranged above the soil restoring bed. The soil restoring bed is connected with the closed-circuit tail gas collecting and disposing system by the induced draught system. Polluted soil is used as a carrier to be connected with the soil restoring bed, the ventilation pipeline system and the detecting system. The system and the method can be used as an economical and feasible ectopic soil ventilation and microorganism degradation coupling restoration device of project application scale and a control method thereof, the control and the restoration technology are organically combined and improved according to local conditions, so as to achieve the unification of the factors such as expense, effect, operability, etc.
Description
Technical field
The present invention relates to system and processing method that a kind of soil heterotopic repair system, particularly dystopy reparation have the volatility organic polluted soil.
Background technology
At present, China's soil pollution is serious day by day, not only destroy the ecosystem of soil own, direct or indirect harm humans health, stride medium pollution but also can form, especially underground water resource is constituted a threat to, cause serious consequence, therefore be badly in need of the engineering recovery technique that research and development tally with the national condition.
The soil remediation technology can be divided into the physics reparation, chemistry is repaired and biological restoration, and the physics reparation comprises elution method, heat treating process etc., and chemistry reparation comprises that solvent extraction, oxidation-reduction method etc., biological restoration comprise microorganism reparation, phytoremediation and animal reparation.These restorative procedures are divided into original position and dystopy reparation again.
Soil ventilation or gaseous phase of soil extracting (SVE) technology are the based technique for in-situ remediation that the nineties developed country grows up.Soil ventilation is by forcing the fresh air Polluted area of flowing through, volatile organic contaminant being separated to be drawn to air stream and to cause ground from soil handle.First patent of this technology results from 20th century the mid-80, is regarded as the environment remediation technology with " revolutionary character " by U.S. EPA at that time, is developed rapidly afterwards.U.S. Patent No. 5,360, the gaseous phase of soil extraction device comprises at least one extraction well and injects well in 067, it injects burning gases to contaminated soil by injecting well, adopted the method for hot reinforcement, its application has certain limitation, only is suitable for the improvement of the hydrocarbons pollutant of high bubble point.Biological (the Bioventing that ventilates, BV) be actually biological enhanced SVE technology, this technology combines the characteristics of injection/extracting of original position air and biology in situ degraded, makes replenishing of the fresh oxygen of indigenous microorganism utilization injection/extractive process carry out aerobic degradation to organic pollution.U.S. Patent No. 60/403,934 has been described biological ventilation repair system, and contaminated area adds the hydro carbons organic matter as the microbial food source at the scene, and repair system comprises injection well, the circulatory system etc., and the vapor phase contaminants circulation that blows out joins restoring area.The pollutant of failing to be degraded by microorganisms is sent to after-treatment system and handles.
More than two kinds of patented technologies only be used for the original position reparation at present, design still depends on on-the-spot and lab analysis data, its application is subjected to the restriction of on-the-spot site condition, make the scope of application, application cost, control and the remediation efficiency etc. of technology still have many parts of waiting to improve and strengthen, there is serious smearing in especially soil aeration technology.Related to a cover among the domestic patent CN1448227A " a kind of contaminated soil heterotopic biological repairing method and special processing installation " and adopted prefabricated bed and vent line thereof to come the heterotopic biological repairing method of repairing polluted soil, the limitation of this patented technology is that the intensity of its gravity-flow ventilation is lower, lack repair system tail gas and induced draught system causes secondary pollution etc. easily.
Summary of the invention
The present invention is directed to the deficiency of above patented technology, provide a kind of and can use the economy of scale, feasible dystopy soil aeration and microbial degradation coupling prosthetic device and control method as engineering, being primarily aimed at and repairing target contaminant is volatility and half volatile organic contaminant in the soil.Proposition is based on the dystopy soil aeration of process intensification and microbial degradation coupling repair system and control technology, will control to organically combine also with recovery technique with suiting measures to local conditions and be improved, and reaches the unification of factors such as expense, effect, operability.
Technical solution of the present invention is as follows:
The dystopy reparation has the system of volatility organic polluted soil, comprises soil remediation bed, vent line system, adds liquid systems, detection system, induced draught system and closed circuit exhaust collection treatment system; The soil remediation bed is a closed system, is provided with vent line system and detection system in the soil remediation bed, is provided with to add liquid systems above the soil remediation bed; By induced draught system the soil remediation bed is connected with closed circuit exhaust collection treatment system; Contaminated soil connects as carrier repairs bed, vent line system and detection system.
Described vent line system is connected with air blast with control valve by pipeline, is set to the single or multiple lift pipeline in the soil remediation bed, and pipeline is laterally or vertically to arrange, in repairing bed, be evenly distributed, arrange a plurality of passages on the pipeline, the aperture is 2～5mm, pitch-row 5～15cm.
Ex-situ repair system of the present invention is to having the processing method of volatility organic polluted soil, it is the method that adopts dystopy soil aeration and microbial degradation to combine, periodic sampling is measured contaminated soil and tail gas concentration, control the operating condition of this repair system in real time, and the carrying out of tail gas handled and qualified discharge simultaneously.
Ex-situ repair system of the present invention is to having the processing method of volatility organic polluted soil, concrete grammar is as follows: at first with pending dystopy contaminated soil according to the granule size classification after, spread from top to bottom by granularity layering from coarse to fine and to fill out in the dystopy soil remediation bed, add microbial inoculum and nutritional auxiliary by adding the per 25～60cm thickness of liquid systems soil; After forming dystopy reparation bed, the detection vertical shaft is set in bed; Induced duct 8 is connected with air separator 10 by exhaust pipe 9, tail gas enters into solvent tank 12 through carrier pipe by vavuum pump 11, absorbed a part by solvent, the solvent that has absorbed tail gas in the solvent tank 12 enters to container 16 through liquid phase delivery pump 14, constitutes tail gas liquid phase treatment system; Fail to be entered to incinerator 15 through gas-phase transport pump 13 and burn, constitute tail gas gas phase treatment system by the tail gas that solvent absorbs.
Adding liquid systems is evenly added in soil by liquid distribution device by a flow container, it is characterized in that in soil, evenly adding means such as efficient degrading bacteria and nutritional auxiliary by liquid distribution device by a flow container, increase biodegradable activity, improve the volatility of pollution components.
The tail gas of ventilation adopts closed circuit collection method and induced draught system.The plastic foil of a sealing of cover is with convenient collection of repairing tail gas above the reparation bed, and induced draught system passes through a vavuum pump and realizes that collected tail gas is delivered to tail-gas after treatment apparatus by pipeline.Closed circuit gathering system is provided with drainpipe, repairs the bed water inlet when preventing the rainy day.
The tail gas of high concentration at first enters into a solvent absorption plant, adopt organic solvent to absorb volatile contaminant, the low concentration volatile contaminant adopts an adsorption column absorptive collection, final regeneration gas enters incinerator and takes the method for the online burning of catalysis to handle, and realizes the nuisancelessization processing of tail gas and the purpose of qualified discharge.
Use the method that this dystopy soil repair system device carries out volatility and the reparation of half volatile organic polluted soil, it is characterized in that to adopt according to field condition modes of operation such as continued operation, intermittently operated, pulse ventilation to implement to repair, remove the effect with dual reinforcement of microbial degradation and coupling to realize physics in the organic polluted soil reparation.
Unique distinction of the present invention is:
1. the design of dystopy soil aeration device of the present invention and microbial augmentation is simple relatively, and in addition, its system device has comprised by such as common facilities that is easy to get such as pvc pipe, valve, pump, containers.These factors make soil aeration and microbial degradation coupling restorative procedure have efficient, economic characteristics, meet China's actual conditions.
2. this method reparation is suitable for the soil wide ranges, is adapted to the scene of different geological conditions, and is common as edaphic conditions such as sand, silt, silty claies.The pollutant kind that is applicable to removal in addition is very extensive, comprises the organic matter of volatilizations such as oil, aromatic hydrocarbons, polycyclic aromatic hydrocarbon, chemical products or half volatile.
3. the vertical shaft test point flexible and convenient that is provided with in the dystopy soil remediation bed system of the present invention, the phase concentrations in the detection system changes at any time; Rationally being provided with of pipeline aerating system and liquid feeding compartment system is beneficial to the even distribution in soil of oxygen, microorganism, nutrient; The exhaust ventilation device has been strengthened the biodegradation of pollutant in soil; Being provided with of exhaust collection and after-treatment system solved the difficult problem of secondary pollution in the repair process.
4. soil aeration of the present invention and microbial augmentation device and pipeline aerating system thereof, add liquid systems, monitoring system, induced draught system and after-treatment system, pipeline portions such as its air-blast device and measurement and exhaust collection and post processing partly organically combine the ideal that constituted on-site soil test and organic pollutant removal, system efficiently, realize the nuisancelessization processing of tail gas, can reach expected test or pollution control target with relative small device investment.Field trial proves, the present invention be have reasonable in design, equipment is simple, easy to operate feasible, be easy to safeguard, field trial and pilot scale process easily the soil heterotopic of control repair system, have broad application prospects.
Description of drawings
Fig. 1: heterotopic biological aeration equipment and control system;
Fig. 2: pipeline aerating system and detection well floor plan.
The specific embodiment
The invention provides the dystopy prosthetic device and the system of a kind of volatility and semi-volatile organic matter contaminated soil.
Be described further below in conjunction with accompanying drawing 1 and 2 pairs of equipment of the present invention of accompanying drawing and method.As shown in Figure 1, the present invention mainly comprises dystopy soil remediation bed 1 and the airtight canopy 7 of plastic foil; Be equipped with the pipeline aerating system that the breather pipe 4 of pore constitutes by air blast 2, control valve 3 and five of on soil remediation bed horizontal direction, evenly arranging; The gaseous phase of soil monitoring system that constitutes by 3～5 detection wells 5 that are provided with on the vertical direction; Add liquid systems 6 by what a flow container and liquid distribution device constituted; The induced draught system that constitutes by induced duct 8 and exhaust pipe 9; The after-treatment system that constitutes by air water separator 10, vavuum pump 11, solvent tank 12, gas-phase transport pump 13, liquid phase delivery pump 14, incinerator 15 and container 16.
The technology of described volatility and the reparation of semi-volatile organic matter contaminated soil heterotopic is: at first, volatilized property and semi-volatile organic matter contaminated soil are dug out from the scene of polluting, the layering dystopy soil remediation bed 1 of evenly packing into will guarantee that bulk density is identical everywhere then; Repair bed before the polluted soil of packing into, set vent line system (as shown in Figure 2), vent line is provided with one deck horizontal pipeline, distance is repaired bed end 20cm, the horizontal pipeline number is 5, and 4 pipe tunnels are set, and horizontal pipeline and pipe tunnel are evenly distributed in repairing bed.Arrange a plurality of passages on the pipeline, the aperture is 2～5mm, pitch-row 5～15cm.Above repairing bed, cover a sealing canopy.Then, start air blast 2, slowly open control valve 3, fresh air is flowed through by breather pipe 4 and is repaired bed, simultaneously, open and add liquid systems 6, efficient degrading bacteria and nutritional auxiliary are evenly sprayed by liquid distribution device and repair on the bed, and the liquid feeding process is per microbial inoculum of 25～60cm thickness soil interpolation and the nutritional auxiliary of packing into.On the one hand, degradation bacteria is carried out aerobic degradation replenishing down of fresh air to organic pollution, on the other hand, fresh air stream is separated volatility or half volatile organic contaminant and is drawn in the air stream from soil, collect by airtight canopy 7, thereby realize the coupling of soil ventilation and microbial degradation, and by detecting well 5 monitoring gaseous phase of soil concentration.The tail gas of collecting enters air water separator 10 by the airtight canopy of induced duct 8 outputs through exhaust pipe 9.Start vavuum pump 11, the tail gas after separating is squeezed into solvent tank 12.Tail gas is reduced to finite concentration after being absorbed by the organic solvent in the solvent tank, enters the processing of burning in the incinerator 15 that catalyst is housed by gas-phase transport pump 13 again; Absorption liquid enters into container 16 by liquid phase delivery pump 14.At last, treated soil is backfilling into former pollued field or uses it for anything else.
Embodiment 1:
Below heterotopic biological aeration equipment of the present invention and control system embodiment 1 are done the effect explanation:
Heterotopic biological aeration equipment and control system are pressed accompanying drawing 1 connecting line in this embodiment, check the pipeline air-tightness.Pending soil is taken from promotion oil recovery factory, Liaohe Oil Field oil recovery two district's greasy filth treatment regions, and soil types belongs to aleuritic texture soil.
Through the about 6m of pretreated Liaohe Oil Field oil-polluted soils
3, by 2 * 3 * 1m
3Bed volume of the present invention divides four layer thicknesses (every layer of 0.25m) shop to fill in dystopy soil remediation bed 1, arranges a plurality of passages on the breather line, and the aperture is 2mm, and pitch-row is 5cm.Efficient degradation solid fungicide and nutritional auxiliary add by 1% of weight in the preliminary treatment soil, mix.Process parameter optimizing sees Table 1 in the repair process.
Table 1 embodiment 1 repair system parameter
Parameter repair system of the present invention
Nutrients optimized proportion C: N: P 100: 10: 1
Soil water saturation degree optimal value 25%
Ventilation flow rate 10-20m
3/ h
Ph value 7.5-8.5
Oxygen content in the gaseous phase of soil＞2% (volume)
Biologies ventilation through 2 months is handled, and the oil content of contaminated soil (total petroleum hydrocarbon TPH) drops to 91.2g/kg from initial 334g/kg,, the solid phase clearance has reached 72.69%.The concentration of pollutant is from initial 8 * 10 in the gas phase
-6(mg/L) drop to 1 * 10
-6(mg/L), the gas phase clearance has reached 87.5%.
Embodiment 2:
Below heterotopic biological aeration equipment of the present invention and control system embodiment 2 are done the effect explanation:
Heterotopic biological aeration equipment and control system are pressed accompanying drawing 1 connecting line in this embodiment, check the pipeline air-tightness.Pending soil is taken from the lonely Dong You of Shandong Shengli Oil Field district, and soil types belongs to aleuritic texture soil.
Through the about 7.2m of the lonely Dong You district's oil-polluted soils of pretreated Shengli Oil Field
3, by 2 * 3 * 1.2m
3Bed volume of the present invention divides threeply degree (every layer of 0.40m) shop to fill in dystopy soil remediation bed 1, arranges a plurality of passages on the breather line, and the aperture is 4mm, and pitch-row is 10cm.Efficient degradation solid fungicide and nutritional auxiliary add by 1% of weight in the preliminary treatment soil, mix.Process parameter optimizing sees Table 1 in the repair process.
Table 2 embodiment 2 repair system parameters
Parameter repair system of the present invention
Nutrients optimized proportion C: N: P 100: 10: 1
Soil water saturation degree optimal value 25%
Ventilation flow rate 10-25m
3/ h
Ph value 7.5-8.5
Oxygen content in the gaseous phase of soil＞2% (volume)
Biologies ventilation through 2 months is handled, and the oil content of contaminated soil (total petroleum hydrocarbon TPH) drops to 120.0g/kg from initial 520g/kg,, the solid phase clearance has reached 76.92%.The concentration of pollutant is from initial 9.5 * 10 in the gas phase
-6(mg/L) drop to 1.3 * 10
-6(mg/L), the gas phase clearance has reached 86.32%.
Embodiment 3:
Below heterotopic biological aeration equipment of the present invention and control system embodiment 3 are done the effect explanation:
Heterotopic biological aeration equipment and control system are pressed accompanying drawing 1 connecting line in this embodiment, check the pipeline air-tightness.Pending soil is taken from Nan You district, Shengli Oil Field shore, and soil types belongs to sandy clay loam.
Through the about 10.8m of pretreated Shengli Oil Field shore Nan You district oil-polluted soils
3, by 2 * 3 * 1.8m
3Bed volume of the present invention divides threeply degree (every layer of 0.60m) shop to fill in dystopy soil remediation bed 1, arranges a plurality of passages on the breather line, and the aperture is 5mm, and pitch-row is 15cm.Efficient degradation solid fungicide and nutritional auxiliary add by 1% of weight in the preliminary treatment soil, mix.Process parameter optimizing sees Table 1 in the repair process.
Table 3 embodiment 3 repair system parameters
Parameter repair system of the present invention
Nutrients optimized proportion C: N: P 100: 10: 1
Soil water saturation degree optimal value 20%
Ventilation flow rate 15-30m
3/ h
Ph value 7.5-8.5
Oxygen content in the gaseous phase of soil＞2% (volume)
Biologies ventilation through 2 months is handled, and the oil content of contaminated soil (total petroleum hydrocarbon TPH) drops to 96.1g/kg from initial 453g/kg,, the solid phase clearance has reached 78.78%.The concentration of pollutant is from initial 8.8 * 10 in the gas phase
-6(mg/L) drop to 1.3 * 10
-6(mg/L), the gas phase clearance has reached 85.23%.
The dystopy reparation that the present invention proposes has the system and the processing method of volatility organic polluted soil, be described by on-the-spot preferred embodiment, person skilled obviously can be in not breaking away from content of the present invention, spirit and scope to structure as herein described with the preparation method changes or suitably change and combination, realize the technology of the present invention.Special needs to be pointed out is, the replacement that all are similar and change apparent to those skilled in the artly, they are regarded as being included in spirit of the present invention, scope and the content.
Claims (4)
1. the dystopy reparation has the system of volatility organic polluted soil, comprises soil remediation bed, vent line system, adds liquid systems, detection system, induced draught system and closed circuit exhaust collection treatment system; It is characterized in that the soil remediation bed is a closed system, in the soil remediation bed, be provided with vent line system and detection system, above the soil remediation bed, be provided with and add liquid systems; By induced draught system the soil remediation bed is connected with closed circuit exhaust collection treatment system; Contaminated soil connects as carrier repairs bed, vent line system and detection system.
2. dystopy reparation as claimed in claim 1 has the system of volatility organic polluted soil, it is characterized in that described vent line system is connected with air blast with control valve by pipeline, in the soil remediation bed, be set to the single or multiple lift pipeline, pipeline is laterally or vertically to arrange, in repairing bed, be evenly distributed, arrange a plurality of passages on the pipeline, the aperture is 2～5mm, pitch-row 5～15cm.
3. the ex-situ repair system of claim 1 is to having the processing method of volatility organic polluted soil, it is characterized in that the method that adopts dystopy soil aeration and microbial degradation to combine, periodic sampling is measured contaminated soil and tail gas concentration, control the operating condition of this repair system in real time, and the carrying out of tail gas handled and qualified discharge simultaneously.
4. ex-situ repair system as claimed in claim 3 is to having the processing method of volatility organic polluted soil, it is characterized in that concrete grammar is as follows: at first with pending dystopy contaminated soil according to the granule size classification after, spread from top to bottom by granularity layering from coarse to fine and to fill out in the dystopy soil remediation bed, add microbial inoculum and nutritional auxiliary by adding the per 25～60cm thickness of liquid systems soil; After forming dystopy reparation bed, the detection vertical shaft is set in bed; Induced duct 8 is connected with air separator 10 by exhaust pipe 9, tail gas enters into solvent tank 12 through carrier pipe by vavuum pump 11, absorbed a part by solvent, the solvent that has absorbed tail gas in the solvent tank 12 enters to container 16 through liquid phase delivery pump 14, constitutes tail gas liquid phase treatment system; Fail to be entered to incinerator 15 through gas-phase transport pump 13 and burn, constitute tail gas gas phase treatment system by the tail gas that solvent absorbs.
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