CN102815832A - Ozone-permeable reactive barrier repair system and method for groundwater repair by using the same - Google Patents
Ozone-permeable reactive barrier repair system and method for groundwater repair by using the same Download PDFInfo
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- 239000002689 soil Substances 0.000 claims abstract description 20
- 238000005273 aeration Methods 0.000 claims abstract description 18
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- 230000008569 process Effects 0.000 claims abstract description 7
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Abstract
The present invention discloses an ozone-permeable reactive barrier repair system and a method for groundwater repair by using the system, and belongs to the technical field of groundwater pollution repair. According to the present invention, based on a characteristic of difficult repair of petroleum polluted groundwater, groundwater of a petroleum polluted groundwater pollution region is subjected to ozone reinforcement aeration, and a permeable reactive barrier is installed below water flow of the groundwater. With the present invention, groundwater polluted by petroleum and organic matters can be effectively repaired while volatile components in groundwater and soil can be effectively treated; characteristics of strong adaptability to water quality of petroleum polluted groundwater, high stability, easy operation, simple treatment process, and continuous operation are provided; water quality of the treated water is good; only adsorbent replacement according to a prompt is required; and characteristics of economy, saving and high treatment efficiency are further provided.
Description
Technical field
The invention belongs to groundwater pollution recovery technique field, be specifically related to a kind of ozone-permeable reactive barrier repair system and repair phreatic method.
Background technology
Along with oil industry rapid development, on petrochemical complex production area, service station and other places, because flooring petroleum, the discharging of oil-containing production waste and oil pipeline seepage etc., a large amount of petroleum pollutions gets into soil layer, makes groundwater pollution.Oil and sub product thereof are more and more serious to the pollution of environment, have injured human and vegeto-animal existence and health.Petroleum pollution is administered and is more and more come into one's own, and various countries have put into effect relevant control measures, policy, a lot of petroleum pollution improvement technology and method have occurred.Before the eighties, the petroleum-polluted underground water and the improvement of soil also only limit to physics and chemical process, i.e. thermal treatment and chemical lixiviation process.Heat treating process is through burning or calcining, purifies majority of organic pollutants in the soil, but also destroys Soil structure and component simultaneously, not only cost an arm and a leg, be difficult to enforcement, and treatment effect is undesirable.Chemistry leaches and washing also can obtain deoiling effect preferably, but the secondary pollution issues limit of used chemical reagent its application.As far back as the seventies; Soil and underground water are by the problem of petroleum pollution when preventing that pipe laying and storage tank from breaking down leakage of oil and oil spilling; U.S.'s Esso research and engineering corporation have just begun to seek the biological solution of cleaning; And find a kind of effectively " bacterium seeding method " in its laboratory study, opened the biological prosthetic oil-polluted soils beginning.
Generally speaking, mainly comprise original position reparation and dystopy recovery technique about the recovery technique of petroleum pollution in the world.Two kinds of recovery techniques cut both ways, and are suitable for use in different places, zone, natural condition separately.But generally speaking, these technology and methods all can not well solve present existing problem, await to explore recovery technique new, more economical, that efficient is higher.When subterranean layer is arrived in Oil spills; Tend to be present in the form of free phase the surface of underground latent water layer, when the density of nonaqueous phase liquid during greater than the density of water, pollutent will pass surface soil and the waterbearing stratum arrives the water proof base plate; Be subduction in underground water, and extending transversely along the water proof base plate; When nonaqueous phase liquid density during less than the density of water, the vertical migration of pollutent is obstructed at W.T., and along the horizontal wide spread of the W.T. unsaturation band of water (mainly).Nonaqueous phase liquid can be fettered by pore media for a long time, and its solubility composition also can diffuse in the underground water gradually, becomes a kind of persistent source of pollution.Usual method is only to remove to the pollutent in underground water or the soil.Such consequence is, in case repair system is out of service, bound nonaqueous phase liquid can and constantly enter water body as a kind of persistent source of pollution continuation again, thereby has polluted water body again.This characteristic of petroleum pollution has caused still imperfection of at present traditional in the world pollution remediation technology, therefore is necessary to develop new recovery technique.These new technologies when removing soil and underground water pollutant, also can remove with freedom mutually with adsorb the oil particle that form mutually exists.
Permeable reactive barrier is at present in the emerging method that is used for original position removal underground water and soil pollution components of many developed countries such as America and Europe." the PRB technology that pollutent is repaired " handbook of EPA (USEPA) distribution in 1998 is defined as PRB: pollute pinnule at underground arrangement active material body of wall so that tackle; Make and pollute pinnule through behind the reaction medium; Its pollutent can be converted into environmentally acceptable another kind of form, thereby realizes making Pollutant levels reach the target of environmental standard.Its principal feature is effectively to handle the various pollutents that exist with forms such as free state, ADSORPTION STATE, The dissolved or gaseous states.The bigger organic pollutant of oxidation technology ability oxidation molecular mass can alleviate the absorption load that subsequent P RB technology alleviates sorbing material.Not only phreatic oxygen level can be increased if oxygenant is an ozone, and the degraded of natural biology can be promoted.Ozone-enhanced underground water aeration (OAS) recovery technique is the soil of the unsaturation band of remedying oil-polluted thing effectively.Its ultimate principle is air to be compressed and sneak into the ozone injection underground water saturation region of respective amount through gas input well; Reason owing to density difference; Air can penetrate the underground water saturation region and rise to non-saturated region, and volatilizable pollutent constantly gets in the pressurized air and is compressed air and takes non-saturated region in the process that rises; Oxygen in the pressurized air constantly is dissolved in underground water simultaneously; Increase the content (often being made the content approaching zero of dissolved oxygen in the underground water that organism polluted) of oxygen in water owing to the activity of mikrobe; Help the activity of mikrobe, can further promote organic microbiological deterioration.Wherein the effect of ozone mainly is to utilize the organic pollutant that is difficult to degrade in its strong oxidizing property oxidation underground water, is convenient to the indigenous microorganism growth in the soil, helps the absorption degraded of mikrobe to petroleum pollution simultaneously.Present research shows; The ozone-enhanced aeration of underground water is highly effective to the processing of the volatile organic contaminant in the underground water saturation district; Good effect just can be received in (as long as generally several days) at short notice; But not really remarkable to promoting biodegradable effect, maybe be short relevant with aeration time.
Summary of the invention
The objective of the invention is problem, a kind of ozone-permeable reactive barrier repair system is provided and repairs phreatic method to existing petroleum pollution groundwater treatment existence.
A kind of ozone-permeable reactive barrier repair system, ozonizer 1 links to each other with ozone generator controller 2 in this repair system, and ozonizer 1, pressurization blower 3, aerated conduit 8 link to each other through pipeline successively; Collection and confinement of gases pipeline 9, vacuum take-off pump 4, emission-control equipment 5 link to each other through pipeline successively; Permeable reactive barrier 6 links to each other with permeable reactive barrier unit 7; This system is through unsaturated district of soil and underground water water table aquifer, and is tangent with water-resisting layer, and wherein aerated conduit 8, permeable reactive barrier 6 are arranged in the water table aquifer phreatic line below 10, and permeable reactive barrier 6 is positioned at and pollutes plumage 11 current downstream; Collection and confinement of gases pipeline 9 is arranged in the unsaturated district of soil, and ozonizer 1, ozone generator controller 2, pressurization blower 3, vacuum take-off pump 4, emission-control equipment 5 are positioned at ground.
Utilize the remedying oil-polluted phreatic method of said system, comprise following steps:
1) aeration well and extraction well are set, aerated conduit (8) gets into underground through the aeration well, and collection and confinement of gases pipeline (9) gets into underground through extraction well; The radius of influence of aeration well is 1.5-30.5m; Within its incidence, extraction well to the aeration well be provided with the distance be 5～10m;
2) ozonizer 1 generates ozone, injects pressurization blower 3 through pipeline, and mixing air is after aerated conduit 8 blasts the contaminated underground water saturation region; Wherein airflow rate is 3～25m
3/ d, the volume ratio of ozone and air is 1:20～1:10;
3) accomplish aeration after 15 ~ 20 minutes, volatile petroleum pollution in unsaturation district is extracted into emission-control equipment 5 vacuum take-off pump 4 times through collection and confinement of gases pipeline 9; Wherein vacuum take-off pump 4 WPs be-2 ~-the 6m water column, its mode of operation is an intermittent type, pumping speed is a step 2) in blast 1.25～5 times of airflow rate.
4) permeable reactive barrier 6 is installed in groundwater flow direction downstream in the pollution zone, and the reaction material of its installation is a gac; Permeable reactive barrier 6 rate of permeation are 1.3 ~ 3.5 times of saturation region, and its width is 1.2 ~ 1.5 times of the vertical current transverse width of pollution plumage (11).
Step 2) the gas injection mode is closed continuous injection stage by stage in, whenever injects once at a distance from 1 hour, injects continuously 10 ~ 15 minutes; Injecting pressure is 0.01 α H+1.1～0.01 α H+1.7 standard atmospheric pressure; Wherein α be from decanting point to face of land scope in the average severe of soil layer, unit is KN/m
3, H is the height from the decanting point to the face of land, unit is m;
Step 2) ozone and air mixed mode are in: in the gas injection process, whenever injected an ozone at a distance from 4 hours, injected continuously 10 ~ 15 minutes;
The form of permeable reactive barrier in the step 4) (6) is diaphragm wall formula, funneling or perfusion processing belt.
The present invention has broken through the pattern of the single treatment technology of current domestic and international underground water; Its beneficial effect is: 1) volatile component can pass through suction process in the oil in the underground water, and the composition that is difficult to degrade can be by ozone oxidation, and the oxygen of injection can be strengthened the autochthons repair ability; Permeable reactive barrier can further be handled petroleum-polluted underground water; And this prosthetic appliance compact construction, simple to operate, safety is high.2) be fit to remove the petroleum pollution that exists with various forms (free phase, solid phase, absorption equate) in the underground water.3) effluent quality is good.Non-saturated region mainly is to exist with volatile component, and clearance is more than 95%; Saturation region petroleum-type clearance is more than 80%, and each main contamination index all reaches national sewage comprehensive discharge primary standard.4) do not produce secondary pollution.Compare with domestic and international similar treatment technology; Reaching under the prerequisite of identical regulation effect, it is about 40%～60% that this techniques save is invested, and the maintenance and management cost reaches 30%～60% of similar technology; Under identical resource input situation; Screening system optimized operation scheme reaches optimal effectiveness, saves working cost and reaches 30%～45%.5) simple to operate, practicable automated operation, unattended.
Description of drawings
Fig. 1 is the renovation technique schema;
Fig. 2 is the synoptic diagram of each major parts of renovation technique;
Among the figure, 1-ozonizer, 2-ozone generator controller, 3-pressurization blower, 4-vacuum take-off pump, 5-exhaust gas processing device, 6-permeable reactive barrier, 7-permeable reactive barrier unit, 8-aerated conduit, 9-collection and confinement of gases pipeline, 10-phreatic line, 11-pollute plumage, 12-groundwater flow direction.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is further specified.
A kind of ozone-permeable reactive barrier repair system, as shown in Figure 1, ozonizer 1 links to each other with ozone generator controller 2 in this repair system, and ozonizer 1, pressurization blower 3, aerated conduit 8 link to each other through pipeline successively; Collection and confinement of gases pipeline 9, vacuum take-off pump 4, emission-control equipment 5 link to each other through pipeline successively; Permeable reactive barrier 6 links to each other with permeable reactive barrier unit 7; This system is through unsaturated district of soil and underground water water table aquifer, and is tangent with water-resisting layer, and wherein aerated conduit 8, permeable reactive barrier 6 are arranged in the water table aquifer phreatic line below 10, and permeable reactive barrier 6 is positioned at and pollutes plumage 11 current downstream; Collection and confinement of gases pipeline 9 is arranged in the unsaturated district of soil, and ozonizer 1, ozone generator controller 2, pressurization blower 3, vacuum take-off pump 4, emission-control equipment 5 are positioned at ground.
Aeration well and extraction well are set, and aerated conduit 8 gets into underground through the aeration well, and collection and confinement of gases pipeline 9 gets into underground through extraction well; The radius of influence of aeration well is 1.5-30.5m; Within its incidence, extraction well to the aeration well be provided with the distance be 5～10m.
At first ozonizer 1 generates ozone under 2 controls of ozone generator controller; Ozone blasts contaminated underground water saturation region at the air that pressurization blower 3 mixes respective amount through aerated conduit 8 through pipeline; Ozone can the petroleum oxidate pollutent in than the organism of difficult degradation; Oxygen branch in the concurrently injected replenish air underground water helps biological Natural Degradation.Volatile petroleum pollution in unsaturation district is extracted into emission-control equipment 5 vacuum take-off pump 4 times through collection and confinement of gases pipeline 9; Contaminated underground water gets into permeable reactive barrier 6 along water (flow) direction 12, the charcoal absorption of the permeable reactive barrier 6 in the underground water, and the underground water after the processing flows away along the groundwater flow direction, and is as shown in Figure 2.
Claims (5)
1. ozone-permeable reactive barrier repair system; It is characterized in that; Ozonizer in this repair system (1) links to each other with ozone generator controller (2), and ozonizer (1), pressurization blower (3), aerated conduit (8) link to each other through pipeline successively; Collection and confinement of gases pipeline (9), vacuum take-off pump (4), emission-control equipment (5) link to each other through pipeline successively; Permeable reactive barrier (6) links to each other with permeable reactive barrier unit (7); This system is through unsaturated district of soil and underground water water table aquifer; Tangent with water-resisting layer; Wherein aerated conduit (8), permeable reactive barrier (6) are arranged in below the water table aquifer phreatic line (10), and permeable reactive barrier (6) is positioned at and pollutes plumage (11) current downstream; Collection and confinement of gases pipeline (9) is arranged in the unsaturated district of soil, and ozonizer (1), ozone generator controller (2), pressurization blower (3), vacuum take-off pump (4), emission-control equipment (5) are positioned at ground.
2. utilize the remedying oil-polluted phreatic method of the said system of claim 1, it is characterized in that, comprise following steps:
1) aeration well and extraction well are set, aerated conduit (8) gets into underground through the aeration well, and collection and confinement of gases pipeline (9) gets into underground through extraction well; The radius of influence of aeration well is 1.5-30.5m; Within its incidence, extraction well to the aeration well be provided with the distance be 5～10m;
2) ozonizer (1) generates ozone, injects pressurization blower (3) through pipeline, and mixing air is after aerated conduit (8) blasts the contaminated underground water saturation region; Wherein airflow rate is 3～25m
3/ d, the volume ratio of ozone and air is 1:20～1:10;
3) accomplish aeration after 15 ~ 20 minutes, volatile petroleum pollution in unsaturation district is extracted into emission-control equipment (5) through collection and confinement of gases pipeline (9) under vacuum take-off pump (4); Wherein vacuum take-off pump (4) WP be-2 ~-the 6m water column, its mode of operation is an intermittent type, pumping speed is a step 2) in blast 1.25～5 times of airflow rate;
4) permeable reactive barrier (6) is installed in groundwater flow direction downstream in the pollution zone, and the reaction material of its installation is a gac; Permeable reactive barrier (6) rate of permeation is 1.3 ~ 3.5 times of saturation region, and its width is 1.2 ~ 1.5 times of the vertical current transverse width of pollution plumage (11).
3. remedying oil-polluted phreatic method according to claim 2 is characterized in that step 2) in the gas injection mode be closed continuous injection stage by stage, whenever at a distance from injection in 1 hour once, injected continuously 10 ~ 15 minutes; Injecting pressure is 0.01 α H+1.1～0.01 α H+1.7 standard atmospheric pressure; Wherein α be from decanting point to face of land scope in the average severe of soil layer, unit is KN/m
3, H is the height from the decanting point to the face of land, unit is m.
4. remedying oil-polluted phreatic method according to claim 2 is characterized in that step 2) in ozone and air mixed mode be: in the gas injection process, whenever, injected continuously 10 ~ 15 minutes at a distance from ozone of injection in 4 hours.
5. remedying oil-polluted phreatic method according to claim 2 is characterized in that, the form of permeable reactive barrier in the step 4) (6) is diaphragm wall formula, funneling or perfusion processing belt.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103230933A (en) * | 2013-04-11 | 2013-08-07 | 华北电力大学 | A device for remediation of organic contaminated soil by using thermal desorption combined with an oxidant and a remediation method |
| CN103837449A (en) * | 2014-01-13 | 2014-06-04 | 华东理工大学 | Simulation device for migration and transformation of volatile organic pollutants in underground water and application |
| CN107350278A (en) * | 2017-07-18 | 2017-11-17 | 中国地质大学（武汉） | Collaboration removes the in-situ remediation system and method for soil and groundwater organic pollution |
| CN110526444A (en) * | 2019-08-23 | 2019-12-03 | 广州环投环境服务有限公司 | A kind of groundwater pollution of refuse landfill restorative procedure |
| CN111069269A (en) * | 2020-01-06 | 2020-04-28 | 北京中岩大地科技股份有限公司 | Method for treating polluted soil of reaction wall by combining vacuum negative pressure forced leaching with active material |
| CN113683180A (en) * | 2021-08-27 | 2021-11-23 | 宝航环境修复有限公司 | Ozone advanced oxidation system for underground water in-situ pumping treatment |
| CN113976603A (en) * | 2021-11-08 | 2022-01-28 | 北京艾孚润德环境科技有限责任公司 | In-situ soil remediation process for treating underground water based on multilayer reaction wall technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110526444A (en) * | 2019-08-23 | 2019-12-03 | 广州环投环境服务有限公司 | A kind of groundwater pollution of refuse landfill restorative procedure |
| CN111069269A (en) * | 2020-01-06 | 2020-04-28 | 北京中岩大地科技股份有限公司 | Method for treating polluted soil of reaction wall by combining vacuum negative pressure forced leaching with active material |
| CN113683180A (en) * | 2021-08-27 | 2021-11-23 | 宝航环境修复有限公司 | Ozone advanced oxidation system for underground water in-situ pumping treatment |
| CN113976603A (en) * | 2021-11-08 | 2022-01-28 | 北京艾孚润德环境科技有限责任公司 | In-situ soil remediation process for treating underground water based on multilayer reaction wall technology |
| CN115594311A (en) * | 2022-10-31 | 2023-01-13 | 光大环境修复（江苏）有限公司（Cn） | Management and control system and method for in-situ super microbubble biological aeration coupled PRB permeable reaction wall of petroleum hydrocarbon organic polluted underground water |
| CN115594311B (en) * | 2022-10-31 | 2024-08-27 | 上田环境修复有限公司 | Management and control system and method for petroleum hydrocarbon organic pollution groundwater in-situ ultramicro bubble biological aeration coupling PRB permeable reaction wall |
| CN116639851A (en) * | 2023-07-27 | 2023-08-25 | 北京科技大学 | Permeable reactive barrier for in-situ restoration of groundwater and treatment method and application thereof |
| CN116639851B (en) * | 2023-07-27 | 2023-10-20 | 北京科技大学 | Permeable reactive barrier for in-situ restoration of groundwater and treatment method and application thereof |
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