CN102974600A - Periodic-dosing oil-gas-liquid three-phase extraction device and method thereof for repairing petroleum-contaminated soil - Google Patents
Periodic-dosing oil-gas-liquid three-phase extraction device and method thereof for repairing petroleum-contaminated soil Download PDFInfo
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Abstract
The invention belongs to the technical field of petroleum-contaminated environment in-situ reparation, and discloses a periodic-dosing oil-gas-liquid three-phase extraction device and a method thereof for repairing petroleum-contaminated soil. In the device, the operation upon a periodic-dosing system comprises the steps that: pneumatic shattering is carried out upon the periphery of a pneumatic shattering/dosing well for 3h under a pressure of 0.2-0.7MPa by using an air compressor, such that the porosity of peripheral soil is improved; and nutrient elements and a surfactant reagent are periodically filled into a filling well, such that soil local microbe growth is promoted, dispersion and solubilization of pollutants on soil particles are promoted, and petroleum pollutant degradation is facilitated. With the device and the method provided by the invention, dosed reagents are effectively and sufficiently utilized, and reagent cost is reduced. With the periodic dosing method, the reagents can fully react with petroleum hydrocarbon pollutants, such that reparation system efficiency can be improved. The improvement of an extraction total volume of petroleum pollutants in soil is up to 20-40%, and an extraction rate is up to 50-65%.
Description
Technical field
The invention belongs to oil polluted environment based technique for in-situ remediation field, be specifically related to the method for a kind of periodicity dosing oil-gas-liquid three-phase extraction device and remedying oil-polluted soils thereof.
Background technology
In the past few decades, be subjected to the restriction of the many factors such as period of history economic technology condition and people's level of understanding, oil play is when making major contribution for country, and also brought a series of environmental problem: the pollutants such as the waste water in the oil-gas mining process, waste gas, ground crude oil, waste gas drilling fluid enter environment and can impact water body, atmosphere, soil and ecological environment.Along with the extensive use of petroleum resources, the oil pollution in the environment is more and more serious.In Petroleum Production, storing, refining processing and use procedure, also have overflowing and discharging of petroleum hydrocarbon, cause water body and the serious oil pollution of soil around oil field and the petrochemical factory.The total output of oil has 2,200,000,000 t every year approximately in the world today, and wherein 17.5 hundred million t are by the land field produces.The whole world has 8,000,000 t entered environments, China that nearly 600,000 t entered environments are arranged every year every year, contaminated soil, underground water, river and ocean, annual new pollution soil 1x10
5T.
Since the eighties in 20th century, the oil pollution problem of soil becomes the environmental problem of countries in the world common concern.The restorative procedure that arises at the historic moment mainly comprises Physical, chemical method and biological method.In general, early stage method of administering oil-polluted soils mainly is traditional physics (steaming process, degassing method, organic solvent method, hydrodynamic cleaning method) and chemical method (oxidizing process, heat treating process), these method required times are short, instant effect, but there are the drawbacks such as secondary pollution, disposal cost height, are unfavorable for using widely.Biological prosthetic is along with people's going deep into the dynamic purification capability study of soil ecosystem self, the biological new technology of intervening soil ecosystem purifying contaminated ability of the using artificial that produces, particularly add biosurfactant or three strains producing biosurfactants and can significantly shorten repair time, improve remediation efficiency, and can keep good environment friendly.It thoroughly, does not cause secondary pollution, operation more simply to reach the repair process mode of whole cost low, applicable dissimilar (original position/dystopys) with its exclusive contaminant degradation and can recover simultaneously the ecosystem advantage such as beautify the environment, and becomes improvement technology up-to-date, with fastest developing speed.Up to the present, by the petroleum-polluted soil that gets of bioremediation technology improvement, being considered to has vitality most, the most representative technology, and oneself becomes the focus of international scientific research as a kind of environmental friendliness technology for it.
Think that so-called contaminated soil biological prosthetic refers to utilize plant and microorganism and other biology, will be present in that pollutant in the soil removes or Degradation and Transformation becomes innocuous substance, make pollutant in soil concentration be reduced to acceptable level.Developed country pays much attention to bioremediation technology, has successively dropped into recovery research and the application of substantial contribution for soil pollution, and a large amount of research institutions and commercial company are engaged in the research work of this technology.German nineteen ninety-five is for about 6,000,000,000 dollars of the investment that purifies soil, the U.S. is used for the investment of soil remediation the nineties above 10,000,000,000 dollars, studies have shown that of they, the bioremediation technology that utilizes the biological decomposition poisonous and harmful substance are a kind of valuable methods of administering the pollution in wide area zone.
In soil remediation, water-soluble is the key factor that affects pollutant removal, a lot of pollutants all are the very strong materials of hydrophobicity, it is slow that speed is repaired in general washing, and efficient is low, people strengthen repairing effect by adding various additives in recent years, and these additives can promote dispersion and the solubilising of pollutant on the soil particle, thereby reach the effect of shortening time raising pollutants removal rate.
Summary of the invention
The object of the present invention is to provide a kind of periodicity dosing oil-gas-liquid three-phase extraction device.
The present invention also aims to provide the method based on periodicity dosing oil-gas-liquid three-phase extraction device restoring petroleum-polluted soil.
A kind of periodicity dosing oil-gas-liquid three-phase extraction device, this device is comprised of periodicity medicine system and oil-gas-liquid three-phase extraction system, periodically medicine system Air compressor 1 links to each other with control system 3 respectively with periodicity chemicals dosing plant 2, air compressor 1 links to each other with gas checking pipe 4, periodically chemicals dosing plant 2 links to each other with chemical feed pipe 5, and gas checking pipe 4 links to each other with gas checking/dosing well 6 respectively with chemical feed pipe 5; Suction pump 7 links to each other with suction tube 18 with gas-liquid separation device 8 respectively in the oil-gas-liquid three-phase extraction system, gas-liquid separation device 8 links to each other with delivery pump 12 with liquid rotary pump 9 respectively, liquid rotary pump 9, gas treatment equipment 10, gas concentration unit 11 link to each other successively, delivery pump 12 links to each other with water oil separating device 13, water oil separating device 13 links to each other with water treating apparatus 15 with oil phase retracting device 14 respectively, water treating apparatus 15 links to each other with water backflow device 16, and suction tube 18 links to each other with suction well 17.
Method based on above-mentioned periodicity dosing oil-gas-liquid three-phase extraction device remedying oil-polluted soils comprises the steps:
1) be under the 0.2-0.7MPa gas checking/dosing well 6 to be carried out the pneumatic 3h that shatters on every side with air compressor 1 at pressure;
2) open periodicity chemicals dosing plant 2 nutrient and surfactant are injected in gas checking/dosing well 6, dosing 9h,, then stopping gas checking and dosing 12h, this is operating as a cycle;
3) dosing is simultaneously opened the suction tube 18 of suction pump 7 by in the suction well 17 petroleum pollution is drawn into ground surface, enters gas-liquid separation device 8; Isolated gas phase passes into gas treatment equipment 10, passes through gas concentration unit 11 or discharging after processing; Isolated liquid phase passes into water oil separating device 13 and is separated into oil phase and water, and oil phase passes into oil phase retracting device 14 and processes, and water passes into water treating apparatus 15 and processes the laggard water backflow device 16 that enters;
4) when opening oil-gas-liquid three-phase extraction system, repeating step 1) and 2) carry out the periodicity dosing, pH, COD, the petroleum hydrocarbon content of Real-Time Monitoring suction well diffusate are when the pH value is 6-9, COD is less than 100mg/L, and petroleum hydrocarbon content stops dosing during less than 10mg/L.
Step 2) described nutrient is comprised of nitrogen, P elements and trace element, and wherein nitrogen, phosphorus add intensity and is: the weight ratio C:N:P of the carbon element content of the pollutant in the soil and nitrogen, P elements is 100:(4-7): (0.8-1.3); Trace element in the nutrient is magnesium, iron, calcium, copper, cobalt, manganese, zinc, boron, molybdenum and selenium, and the weight ratio of carbon trace element is 1:(10
-8-10
-3).
Step 2) described surfactant is conventional surfactants, and its quality is the 0.005-0.02 of soil PetroChina Company Limited. pollutant gross mass.
Beneficial effect of the present invention is: 1) periodically dosing in aspiration procedure, greatly improved petroleum pollution and the heavy metal degradability in soil; 2) suction of water oil mixture, isolation integral, compact equipment, simple to operate, reliability is high; 3) petroleum hydrocarbon organic pollutant removal rate is more than 95%, and disposable repairing effect is good; 4) repairing efficiency is shorter, reduces 10%-25% repair time, does not produce secondary pollution; 5) the suction cumulative volume that adds the NLBS after-treatment system improves 20%-40%, and aspiration rates improves 50%-65%; 6) good promotion potential is arranged at home and abroad, the oil pollution that gas station, oil product production, chemical products production etc. are caused has preferably treatment effect, and this invention has wide market prospects.
Description of drawings
Fig. 1 is periodicity dosing oil-gas-liquid three-phase extraction device schematic diagram;
Among the figure, 1-air compressor, 2-be chemicals dosing plant, 3-control system, 4-gas checking pipe, 5-chemical feed pipe, 6-gas checking/dosing well, 7-suction pump, 8-gas-liquid separation device, 9-liquid rotary pump, 10-gas treatment equipment, the recovery of 11-gas, 12-delivery pump, 13-water oil separating device, 14-oil phase retracting device, 15-water treating apparatus, 16-water backflow device, 17-suction well, 18-suction tube periodically.
Fig. 2 extraction system is without the suction cumulative volume comparing result after dosing and the dosing periodically.
Fig. 3 extraction system is without the aspiration rates comparing result after dosing and the dosing periodically.
The specific embodiment
The present invention will be further described below in conjunction with accompanying drawing and instantiation:
Periodicity dosing oil-gas-liquid three-phase extraction device as shown in Figure 1, this device is comprised of periodicity medicine system and oil-gas-liquid three-phase extraction system, periodically medicine system Air compressor 1 links to each other with control system 3 respectively with periodicity chemicals dosing plant 2, air compressor 1 links to each other with gas checking pipe 4, periodically chemicals dosing plant 2 links to each other with chemical feed pipe 5, and gas checking pipe 4 links to each other with gas checking/dosing well 6 respectively with chemical feed pipe 5; Suction pump 7 links to each other with suction tube 18 with gas-liquid separation device 8 respectively in the oil-gas-liquid three-phase extraction system, gas-liquid separation device 8 links to each other with delivery pump 12 with liquid rotary pump 9 respectively, liquid rotary pump 9, gas treatment equipment 10, gas concentration unit 11 link to each other successively, delivery pump 12 links to each other with water oil separating device 13, water oil separating device 13 links to each other with water treating apparatus 15 with oil phase retracting device 14 respectively, water treating apparatus 15 links to each other with water backflow device 16, and suction tube 18 links to each other with suction well 17.
Fig. 2 and Fig. 3 have reflected respectively interpolation periodicity medicine system front and back in the pilot experiment, the contrast of extraction system suction cumulative volume and aspiration rates, can find out that clearance and the pumping efficiency of whole extraction system is significantly improved after the periodically dosing, wherein aspirate cumulative volume and can improve 20%-40%, aspiration rates improves 50%-65%.
Set up one in Panjin City Liaohe Oil Field, Liaoning Province in 2010 and overlap above-mentioned periodicity dosing oil-gas-liquid three-phase extraction device, and utilized the restoring petroleum-polluted soil of said apparatus original position, step is as follows.
1) be under the 0.2-0.7MPa gas checking/dosing well 6 to be carried out the pneumatic 3h that shatters on every side with air compressor 1 at pressure;
2) open periodicity chemicals dosing plant 2 nutrient and surfactant are injected in gas checking/dosing well 6, dosing 9h,, then stopping gas checking and dosing 12h, this is operating as a cycle;
3) dosing is simultaneously opened the suction tube 18 of suction pump 7 by in the suction well 17 petroleum pollution is drawn into ground surface, enters gas-liquid separation device 8; Isolated gas phase passes into gas treatment equipment 10, passes through gas concentration unit 11 or discharging after processing; Isolated liquid phase passes into water oil separating device 13 and is separated into oil phase and water, and oil phase passes into oil phase retracting device 14 and processes, and water passes into water treating apparatus 15 and processes the laggard water backflow device 16 that enters;
4) when opening oil-gas-liquid three-phase extraction system, repeating step 1) and 2) carry out the periodicity dosing, pH, COD, the petroleum hydrocarbon content of Real-Time Monitoring suction well diffusate are when the pH value is 6-9, COD is less than 100mg/L, and petroleum hydrocarbon content stops dosing during less than 10mg/L.
Step 2) described nutrient is comprised of nitrogen, P elements and trace element, and wherein nitrogen, phosphorus add intensity and is: the weight ratio C:N:P of the carbon element content of the pollutant in the soil and nitrogen, P elements is 100:(4-7): (0.8-1.3); Trace element in the nutrient is magnesium, iron, calcium, copper, cobalt, manganese, zinc, boron, molybdenum and selenium, and the weight ratio of carbon trace element is 1:(10
-8-10
-3).
Step 2) described surfactant is conventional surfactants, and its quality is the 0.005-0.02 of soil PetroChina Company Limited. pollutant gross mass.
Claims (4)
1. dosing oil-gas-liquid three-phase extraction device periodically, it is characterized in that, this device is comprised of periodicity medicine system and oil-gas-liquid three-phase extraction system, periodically medicine system Air compressor (1) links to each other with control system (3) respectively with periodicity chemicals dosing plant (2), air compressor (1) links to each other with gas checking pipe (4), periodically chemicals dosing plant (2) links to each other with chemical feed pipe (5), and gas checking pipe (4) links to each other with gas checking/dosing well (6) respectively with chemical feed pipe (5); Suction pump (7) links to each other with suction tube (18) with gas-liquid separation device (8) respectively in the oil-gas-liquid three-phase extraction system, gas-liquid separation device (8) links to each other with delivery pump (12) with liquid rotary pump (9) respectively, liquid rotary pump (9), gas treatment equipment (10), gas concentration unit (11) links to each other successively, delivery pump (12) links to each other with water oil separating device (13), water oil separating device (13) links to each other with water treating apparatus (15) with oil phase retracting device (14) respectively, water treating apparatus (15) links to each other with water backflow device (16), and suction tube (18) links to each other with suction well (17).
2. based on the method for periodicity dosing oil-gas-liquid three-phase extraction device remedying oil-polluted soils claimed in claim 1, it is characterized in that, comprise the steps:
1) be under the 0.2-0.7MPa gas checking/dosing well (6) to be carried out the pneumatic 3h that shatters on every side with air compressor (1) at pressure;
2) open periodicity chemicals dosing plant (2) nutrient and surfactant are injected in gas checking/dosing well (6), dosing 9h,, then stopping gas checking and dosing 12h, this is operating as a cycle;
3) dosing is opened suction pump (7) and by the suction tube (18) in the suction well (17) petroleum pollution is drawn into ground surface simultaneously, enters gas-liquid separation device (8); Isolated gas phase passes into gas treatment equipment (10), passes through gas concentration unit (11) or discharging after processing; Isolated liquid phase passes into water oil separating device (13) and is separated into oil phase and water, and oil phase passes into oil phase retracting device (14) and processes, and water passes into water treating apparatus (15) and processes the laggard water backflow device (16) that enters;
4) when opening oil-gas-liquid three-phase extraction system, repeating step 1) and 2) carry out the periodicity dosing, pH, COD, the petroleum hydrocarbon content of Real-Time Monitoring suction well diffusate are when the pH value is 6-9, COD is less than 100mg/L, and petroleum hydrocarbon content stops dosing during less than 10mg/L.
3. according to the method for right 2 described remedying oil-polluted soils, it is characterized in that, step 2) described nutrient is comprised of nitrogen, P elements and trace element, and wherein nitrogen, phosphorus add intensity and is: the weight ratio C:N:P of the carbon element content of the pollutant in the soil and nitrogen, P elements is 100:(4-7): (0.8-1.3); Trace element in the nutrient is magnesium, iron, calcium, copper, cobalt, manganese, zinc, boron, molybdenum and selenium, and carbon is 1:(10 with the weight ratio of trace element
-8-10
-3).
4. according to the method for right 2 described remedying oil-polluted soils, it is characterized in that step 2) described surfactant is conventional surfactants, its quality is the 0.005-0.02 of soil PetroChina Company Limited. pollutant gross mass.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302089A (en) * | 2013-07-01 | 2013-09-18 | 上海格林曼环境技术有限公司 | Integrated type multifunctional movable soil underground water repairing equipment and application thereof |
| CN104874592A (en) * | 2015-03-18 | 2015-09-02 | 江苏盖亚环境工程有限公司 | In situ multi-phase extraction system for contaminated soil |
| CN105521990A (en) * | 2016-01-28 | 2016-04-27 | 浙江博世华环保科技有限公司 | In-situ remediation system and remediation method for organic pollution site of light non-aqueous phase liquids (LNAPLs) |
| CN107552549A (en) * | 2017-08-29 | 2018-01-09 | 武汉都市环保工程技术股份有限公司 | A kind of bio- ventilation strengthens multiphase extraction system in situ |
| CN107935066A (en) * | 2017-11-17 | 2018-04-20 | 中国环境科学研究院 | LNAPL pollution amelioration system and methods in underground water based on pollution resistance control |
| CN109675922A (en) * | 2018-12-27 | 2019-04-26 | 武汉瑞景环境修复工程有限公司 | The method of in-situ oxidation, gas phase extracting combined system and rehabilitating soil |
| CN112058887A (en) * | 2020-09-15 | 2020-12-11 | 森特士兴集团股份有限公司 | Pneumatic fracturing strengthening multiphase extraction system for pollution site treatment |
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