CN102228900B - In situ integrated restoring system and method of petroleum polluted soil - Google Patents
In situ integrated restoring system and method of petroleum polluted soil Download PDFInfo
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- CN102228900B CN102228900B CN 201110129619 CN201110129619A CN102228900B CN 102228900 B CN102228900 B CN 102228900B CN 201110129619 CN201110129619 CN 201110129619 CN 201110129619 A CN201110129619 A CN 201110129619A CN 102228900 B CN102228900 B CN 102228900B
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Abstract
The invention discloses an in situ integrated restoring system and a method of petroleum polluted soil, and belongs to the technical field of petroleum polluted soil restoration. The system provided by the invention is composed of a suction well, a vacuum pump, a steam-water separation system, an oil-water separation system, a dosage pot, an injector pump, an injection well and an automatic control system. With the combination of the merits of vacuum suction and biological restoration, free-phase and high-density gas-phase pollutants in soil can be sucked and pumped in the invention; and simultaneously a surfactant reinforced biological restoration method can be adopted to accelerate the degradation or transformation and distribution of petroleum pollutants adsorbed on soil, so as to raise the in situ soil restoration efficiency, shorten the technological process, reduce the restoration cost and widen the application range of the in situ restoration technology.
Description
Technical field
The invention belongs to oil-polluted soils recovery technique field, be specifically related to a kind of original position comprehensive repair system and method for oil-polluted soils.
Background technology
In exploitation, smelting, use and the transportation of oil, and the process such as discharging of oily waste water, sewage irrigation can cause soil petroleum pollution; The volatilization of various petroleum products, imperfect combustion thing descend slowly and lightly etc. also can cause serial soil petroleum pollution; The leakage of buried tank oil product is the common cause of current soil and underground water pollution.Petroleum pollution can change the soil organism and form, and the spoiled soil structure affects soil permeability, hinders root system of plant and breathes; That benzene homologues in oil (BTEX) and polycyclic aromatic hydrocarbon have is carcinogenic, mutagenesis, teratogenesis, and can by food chain step by step enrichment have influence on the mankind; Not volatile and by the part of the adsorption by soil polluted underground water that can also permeate the ground in petroleum pollution.And the characteristics such as the soil and groundwater organic contamination has complexity, disguise and the pollution control difficulty is large, expense is high, the time is long.Therefore the petroleum-type pollutant has become one of the most outstanding at present and in the future environmental problem to soil and water environment pollution, causes that people pay much attention to.
The recovery technique of existing soil petroleum pollution thing can be divided into three major types, i.e. physics restorative procedure, chemical repair method and biological renovation method simply.At present adopt based technique for in-situ remediation for the reparation of subterranean layer petroleum pollution more.Based technique for in-situ remediation possesses skills simple, and cost is lower, need not the advantages such as pollutant transfer.As popular in the world microorganism recovery technique, phytoremediation technology, chemical surfactant recovery technique etc.But the deficiency of these technology shows that repair time is long, is difficult to realize omnidistance process control, thereby is difficult to estimate to removing efficient.Microorganism recovery technique, high-efficiency strain are difficult to obtain, and the bacterial screening difficulty is higher, and affected by environment very big, are not easy to Technique Popularizing.The chemistry recovery technique can only be for the processing of some specific pollutant, and operating cost is very high.Phytoremediation technology still is in conceptual phase, and is technical also very immature.Main is, these traditional technology often can only be for certain first kinds of pollution matter, or the improvement of individual event pollutant.For example, soil steam extraction technology and biological washing technology can only be for unsaturation layer removal of pollutants, and the pump treatment technology can only be for the removal of dissolubility pollutant in the saturated zone water-bearing layer.In fact, because the condition of polluting is different, cause the nature difference of pollution level, pollutant of oil-polluted soils larger, simultaneously, due to the restriction of various environmental conditions and technology maturation degree, make the practicality of various treatment technologies also be subject to certain restriction.In concrete application process, relying on merely a kind of method or technology is cleaning and the reparation that is difficult to realize contaminated soil, and makes the soil restoration natural quality, usually need to take physics, chemistry and biology and engineering method to carry out the comprehensive regulation.Synergy by various treatment technologies reduces disposal cost to reach, shortens the effect for the treatment of cycle and raising treatment effect.
Summary of the invention
The purpose of this reality invention is to provide a kind of original position comprehensive repair system of oil-polluted soils.
The purpose of this reality invention also is to provide a kind of original position method for comprehensive repairing of oil-polluted soils, with vacuum draw and bioremediation technology organic combination, to realize volatile and synchronous reparation not volatile components in to petroleum pollution.
A kind of original position comprehensive repair system of oil-polluted soils is made of suction well 1, vavuum pump 2, carbonated drink piece-rate system 3, oil-water separation system 4, dispensing canister 5, injection pump 6, Injection Well 7, automatic control system 8; The suction well is made of well envelope 9, suction tube 10, adjustable knotter screen pipe 11; Suction well 1 connects carbonated drink piece-rate system 3, oil-water separation system 4, dispensing canister 5, injection pump 6, Injection Well 7 successively; Vavuum pump 2 is connected with carbonated drink piece-rate system 3; Automatic control system 8 is connected with injection pump 6 with vavuum pump 2 respectively.
Described adjustable knotter screen pipe 11 has adjustable interlayer, and this interlayer can make the length of the waterproof part of screen casing regulate between the screen casing overall length 0.
A kind of original position method for comprehensive repairing of oil-polluted soils, carry out in accordance with the following steps:
A, according to on-site soil pollution condition and hydrogeological information, the design recovery scenario is arranged suction well and Injection Well;
B, carbonated drink piece-rate system 3, vavuum pump 2, oil-water separation system 4, dispensing canister 5, injection pump 6, automatic control system 8 are installed on ground;
C, suitable injection liquid composition and the proportioning of selection add dispensing canister 5, inject Injection Wells 7 by injection pump 6;
D, according to the magnitude relationship of suction well 1 liquid level or liquid-gas ratio and setting numerical value determine adjustable knotter screen pipe 11, vavuum pump 2, injection pump 6 unlatching, close or the power variation, running parameter is set, the startup system, during normal operation, the control law of automatic control system 8 is as follows: the difference of liquid level and suction tube 10 entrances is less than setting value in suction well 1, or suction gained liquid-gas ratio is closed the following adjustable knotter screen pipe 11 of liquid level less than setting value; Less than setting value, open injection pump 6 when suction gained liquid-gas ratio; When injection pump 6 opening times surpass setting value, close injection pump 6, close vavuum pump 2, open adjustable knotter screen pipe 11; The difference of liquid level and suction tube 10 entrances greater than setting value, is opened vavuum pump in suction well 1; Until repair process finishes.
Described injection liquid composition quality percentage is: hydrogen peroxidase 10 .5～2%, nitrate 0.1～1%, phosphate 0.2～2%, biosurfactant 0.2～2%, all the other are clear water.
Beneficial effect of the present invention: the present invention combines the advantage of vacuum draw and biological restoration, can take suction method to the free phases in soil and high concentration vapor phase contaminants, can take the method for the biological restoration of surfactant reinforcement to accelerate its degraded or transform migration the petroleum pollution that is adsorbed in soil again simultaneously, thereby improve the remediation efficiency that original position soil is repaired, shortened process, reduce rehabilitation cost, enlarged the scope of application of based technique for in-situ remediation.
Description of drawings
Fig. 1 is the original position comprehensive repair system schematic of oil-polluted soils of the present invention;
In figure, 1-suction well, 2-vavuum pump, 3-carbonated drink piece-rate system, 4-oil-water separation system, 5-dispensing canister, 6-injection pump, 7-Injection Well, 8-automatic control system, 9-suction well are by well envelope, 10-suction tube, 11-is adjustable knotter screen pipe, 12-contaminated soil, 13-free phases, 14-air, 15-underground water.
The specific embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments.
The present embodiment rehabilitating soil is Panjin City Liaohe Oil Field, Liaoning Province oil-polluted soils, and the original position comprehensive repair system (Fig. 1) of oil-polluted soils is made of suction well 1, vavuum pump 2, carbonated drink piece-rate system 3, oil-water separation system 4, dispensing canister 5, injection pump 6, Injection Well 7, automatic control system 8; The suction well is made of well envelope 9, suction tube 10, adjustable knotter screen pipe 11; Suction well 1 connects carbonated drink piece-rate system 3, oil-water separation system 4, dispensing canister 5, injection pump 6, Injection Well 7 successively; Vavuum pump 2 is connected with carbonated drink piece-rate system 3; Automatic control system 8 is connected with injection pump 6 with vavuum pump 2 respectively; Adjustable knotter screen pipe 11 has adjustable interlayer, and this interlayer can make the length of the waterproof part of screen casing regulate between the screen casing overall length 0.
Use the original position comprehensive repair system remedying oil-polluted soils method of above-mentioned oil-polluted soils, carry out in accordance with the following steps:
A, at first excavate detecting shaft, its soil and underground water pollution situation are observed and detected.The analysis showed that, this contaminated sites is mainly free phases catenanes (short, medium chain the is main) petroleum pollution that is enriched in a large number in underground water and soil, and that arranges well adds up to 20, wherein, and 3, suction well, 5 of Injection Wells, 12 of monitor wells.
B, carbonated drink piece-rate system 3, vavuum pump 2, oil-water separation system 4, dispensing canister 5, injection pump 6, automatic control system 8 are installed on ground;
C, suitable injection liquid composition and the proportioning of selection add dispensing canister 5, inject Injection Wells 7 by injection pump 6; Injection liquid composition quality percentage is: hydrogen peroxide 1%, nitrate 0.5%, phosphate 1%, biosurfactant 1%, clear water 96.5%;
D, according to the magnitude relationship of suction well 1 liquid level or liquid-gas ratio and setting numerical value determine adjustable knotter screen pipe 11, vavuum pump 2, injection pump 6 unlatching, close or the power variation, adopt the MCGS configuration software, running parameter is set, the startup system, during normal operation, the control law of automatic control system 8 is as follows: the difference of liquid level and suction tube 10 entrances is less than setting value in suction well 1, or suction gained liquid-gas ratio is closed the following adjustable knotter screen pipe 11 of liquid level less than setting value; Less than setting value, open injection pump 6 when suction gained liquid-gas ratio; When injection pump 6 opening times surpass setting value, close injection pump 6, close vavuum pump 2, open adjustable knotter screen pipe 11; The difference of liquid level and suction tube 10 entrances greater than setting value, is opened vavuum pump in suction well 1; System's operation 65 days, repair process finishes.
Recruitment evaluation: run duration, the removal of monitor well oil phase is most effective can reach 100%, and the average removal rate of each well is 63.43%.Mean concentration at operation starting stage VOS is 591ppm, is 951ppm to the maximum; After system's operation, the mean concentration of VOS is reduced to 189ppm, and peak concentration is reduced to 290ppm.Illustrate that this invention can effectively process the various pollutants that exist with forms such as free state, ADSORPTION STATE, solubilised state or gaseous states in a short time, can process simultaneously be present in simultaneously saturated zone and unsaturation band petroleum pollution.
Claims (2)
1. the original position method for comprehensive repairing of an oil-polluted soils, it is characterized in that, the method is used the original position comprehensive repair system of oil-polluted soils, and this system is made of suction well (1), vavuum pump (2), carbonated drink piece-rate system (3), oil-water separation system (4), dispensing canister (5), injection pump (6), Injection Well (7), automatic control system (8); The suction well is made of well envelope (9), suction tube (10), adjustable knotter screen pipe (11); Suction well (1) connects carbonated drink piece-rate system (3), oil-water separation system (4), dispensing canister (5), injection pump (6), Injection Well (7) successively; Vavuum pump (2) is connected with carbonated drink piece-rate system (3); Automatic control system (8) is connected with injection pump (6) with vavuum pump (2) respectively; Adjustable knotter screen pipe (11) has adjustable interlayer, and this interlayer makes the length of the waterproof part of screen casing regulate between the screen casing overall length 0; The method is carried out in accordance with the following steps:
A, according to on-site soil pollution condition and hydrogeological information, the design recovery scenario is arranged suction well and Injection Well;
B, carbonated drink piece-rate system (3), vavuum pump (2), oil-water separation system (4), dispensing canister (5), injection pump (6), automatic control system (8) are installed on ground;
C, suitable injection liquid composition and the proportioning of selection add dispensing canister (5), inject Injection Well (7) by injection pump (6);
D, according to the magnitude relationship of suction well (1) liquid level or liquid-gas ratio and setting numerical value determine adjustable knotter screen pipe (11), vavuum pump (2), injection pump (6) unlatching, close or the power variation, running parameter is set, the startup system, during normal operation, the control law of automatic control system (8) is as follows: the difference of liquid level and suction tube (10) entrance is less than setting value in suction well (1), or suction gained liquid-gas ratio is closed the following adjustable knotter screen pipe (11) of liquid level less than setting value; Less than setting value, open injection pump (6) when suction gained liquid-gas ratio; When injection pump (6) opening time surpasses setting value, close injection pump (6), close vavuum pump (2), open adjustable knotter screen pipe (11); The difference of liquid level and suction tube (10) entrance greater than setting value, is opened vavuum pump in suction well (1); Until repair process finishes.
2. a kind of original position method for comprehensive repairing of oil-polluted soils according to claim 1, it is characterized in that, described injection liquid composition quality percentage is: hydrogen peroxidase 10 .5～2%, nitrate 0.1～1%, phosphate 0.2～2%, biosurfactant 0.2～2%, all the other are clear water.
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| CN 201110129619 CN102228900B (en) | 2011-05-18 | 2011-05-18 | In situ integrated restoring system and method of petroleum polluted soil |
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| CN102228900B true CN102228900B (en) | 2013-06-12 |
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| CN102974600B (en) * | 2012-11-10 | 2013-11-20 | 华北电力大学 | Periodic-dosing oil-gas-liquid three-phase extraction device and method thereof for repairing petroleum-contaminated soil |
| CN103100558B (en) * | 2012-12-12 | 2014-08-20 | 华北电力大学 | Biologically auxiliary pneumatic burst and three-phase vacuum suction soil repair device and method |
| CN103008335B (en) * | 2012-12-12 | 2014-12-03 | 华北电力大学 | In-situ heating combined double-phase vacuum drawing soil restoration device and method |
| CN103230933B (en) * | 2013-04-11 | 2014-12-31 | 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 |
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| CN103639193B (en) * | 2013-12-26 | 2015-07-22 | 江苏盖亚环境工程有限公司 | Restoration method for organically polluted site soil through circular in-situ chemical oxidation |
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| JP2017518868A (en) * | 2014-05-04 | 2017-07-13 | イッサム・リサーチ・ディベロップメント・カンパニー・オブ・ザ・ヘブルー・ユニバーシティ・オブ・エルサレム・リミテッド | Purification of contaminated soil |
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