CN102921718B - Two-phase vacuum suction device with auxiliary chemical leaching and method for repairing soil thereof - Google Patents
Two-phase vacuum suction device with auxiliary chemical leaching and method for repairing soil thereof Download PDFInfo
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- CN102921718B CN102921718B CN201210425622.XA CN201210425622A CN102921718B CN 102921718 B CN102921718 B CN 102921718B CN 201210425622 A CN201210425622 A CN 201210425622A CN 102921718 B CN102921718 B CN 102921718B
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Abstract
The invention belongs to the technical field of polluted soil in-situ repair, and particularly relates to a two-phase vacuum suction device with auxiliary chemical leaching and a method for repairing soil thereof. The device mainly comprises a leaching solution box, a booster pump, a leaching pipeline system, a vacuum suction pump, a gas-liquid separator, a liquid-phase processing unit, a gas-phase processing unit and an intelligent electric control system. The method comprises the following steps of: installing the leaching pipeline system on the surface of a polluted site, selecting a leaching agent as well as the dosage and the concentration of the leaching agent according to the pollution situation and the hydrogeological condition of the site, and washing pollutants into a leaching solution after the leaching is concluded; and then starting the vacuum suction pump, and sucking the leaching solution out of the surface by applying a vacuum and then further processing the leaching solution. The device and the method disclosed by the invention have the characteristics of being rapid, economic, efficient and the like, and have a good removal effect for organic matter pollution and heavy metals, wherein the removal rate can achieve 80-90%, the construction cost is saved by 45-65% compared with the traditional one, and the operation management expense is saved by about 25-35%.
Description
Technical field
The invention belongs to contaminated soil based technique for in-situ remediation field, be specifically related to the method for the auxiliary two-phase vacuum suction apparatus of a kind of chemical leaching and rehabilitating soil thereof.
Background technology
The dystopy of soil chemistry is repaired the extensive concern that has obtained Chinese scholars in recent years, and a large amount of manpower and materials drop into dystopy chemistry and repair research, have obtained in some aspects good achievement in research.Scholar mainly studies around the consumption of chemical leaching selection and chemical leaching at present, explores the injected volume of the best eluent of drip washing effect under different condition simultaneously and throws in speed.
At drip washing technological parameter, affect the aspects such as parameter, domesticly done a large amount of experimental studies, and drawn good result of study.Such as nationality state east, wait the relevant issues that relate to and chemical leaching in the dystopy drip washing of having studied soil to select problem.They find that the main factor that affects of Remediation of Soil Contaminated with Oil Pollutants by Ex-Situ Chemical Washing is: the character of the property of soil, character, concentration and the ageing time of pollutant, drip washing reagent and concentration, drip washing process conditions (liquid-solid ratio, drip washing time (20 ~ 60min), drip washing temperature, stirring intensity) etc. (document 1: nationality state east etc.: Remediation of Soil Contaminated with Oil Pollutants by Ex-Situ Chemical Washing. Chinese science and technology paper is online, and 2005).And also have correlative study exploitation at soil chemistry drip washing prosthetic appliance, Chinese patent 201010106509.6 discloses drip washing removal method and the device of the PAHs in a kind of contaminated soil, this device is the upper and lower laying of the contaminated soil based in drip washing post, thereby the mineral wool of avoiding contaminated soil leacheate to move up and down, leacheate then moves up and down and then drip washing contaminated soil in drip washing post, remove PAHs pollutant wherein, the eluent of choosing in this lessivation is biodiesel.Same Chinese patent 201110144101.2 discloses a kind of circulation cleaning system and device and the method that contaminated soil washing is repaired, this patent be mainly by soil ratio between 10:1, repeatedly do the wash contaminated soil, thereby reach the effect of removing pollutant.Although these inventions and researched and solved the blank of dystopy drip washing equipment, the large-scale soil of same design excavates, and repair process expends a large amount of human and material resources.This is a problem demanding prompt solution.
And aspect vacuum draw, domestic also beginning dropped into a large amount of manpower and materials to the research of vacuum draw, obtained in some aspects good achievement.For example domestic for volatile contaminant in soil, research and develop the pneumatic assisted vacuum liposuction technique that shatters, and aspect suction well, researched and developed respectively two-phase vacuum draw well and three-phase vacuum draw well technology.For example Chinese patent 200910087053.0 disclose a kind of gas broken with gas stripping linked vacuum underground water pumping in-situ repair method.This patent is mainly to utilize gas to break with air lift the pollutant being adsorbed in soil particle is produced by boasting, and then utilizes vacuum draw that pollutant is extracted out from suddenly, finally reaches the effect of removing pollutant.Although the method is effective to volatile ingredient in soil, for obstinate pollutant in unexpected or heavy metal etc., just cannot play effective removal effect.
At present the recovery technique of China and equipment are mostly in development and be showering technology and equipment mostly.Although external, develop advanced technology and equipment, the introduction appropriate litigation fees of technology and equipment is high, and not necessarily equipment and the localization of technology energy.The auxiliary two-phase vacuum draw soil remediation method of this patent invention chemical leaching and equipment can effectively solve the blank of the prosthetic appliance of domestic market, this equipment has solved dystopy drip washing needs a large amount of work of excavating, and has strengthened the efficiency of bidirectional vacuum suction simultaneously.Therefore, this invention can reduce the rehabilitation cost of soil greatly, promotes China's soil remediation industry to optimum sustainable future development.
Summary of the invention
The object of the invention is to overcome a large amount of excacations of chemical leaching, overcome the inefficient problem of two-phase vacuum draw simultaneously, the method for the auxiliary two-phase vacuum suction apparatus of a kind of chemical leaching and rehabilitating soil thereof is provided.
A kind of chemical leaching is assisted two-phase vacuum suction apparatus, this device is connected with force (forcing) pump 3 by connecting pipe by leacheate case 1, on pipeline, there is the first electromagnetic valve 2, in force (forcing) pump 3 exits, there are electromagnetic flowmeter 5 and the second electromagnetic valve 6, force (forcing) pump 3 is connected with drip washing pipe-line system 7, and drip washing pipe-line system 7 has micropore 19; On two-phase vacuum draw well 11, have well lid 9, well lid 9 is provided with the second pressure gauge 20; In two-phase vacuum well, pipeline 22 enters in two-phase vacuum draw well 11 by well lid 9, has aperture 21 on pipeline; In two-phase vacuum well, pipeline 22 other ends are connected with Vacuum suction pump 10, the 3rd electromagnetic valve 8 is installed by Bing import department, the 4th electromagnetic valve 14 and the first pressure gauge 13 are installed in Vacuum suction pump 10 exits, Vacuum suction pump 10 is connected with gas-liquid separator 16, gas-liquid separator 16 is connected with gas phase treatment unit 18 with liquid phase processing unit 12 respectively by pipeline, has respectively the 5th electromagnetic valve 15 and the 6th electromagnetic valve 17 on pipeline; Force (forcing) pump 3, electromagnetic flowmeter 5, Vacuum suction pump 10, liquid phase processing unit 12, the first pressure gauge 13, gas-liquid separator 16, gas phase treatment unit 18, the second pressure gauge 20 are connected with intelligent electric control system 4 respectively with all electromagnetic valves, and controlled by intelligent electric control system 4.
The pipeline micropore 19 of drip washing pipe-line system 7 is in duct bottom, and angle is downward 60 °.
The diameter of the aperture 21 in two-phase vacuum well on pipeline 22 is 5 ~ 6mm.
Utilize said apparatus to carry out a method for soil remediation, comprise the steps:
1) carry out the investigation of contaminated site, determine hydrogeologic condition and the pollutant physicochemical properties of contaminated site;
2) according to pollution condition, determine eluent and consumption and concentration in leacheate used, two-phase vacuum draw well 11 is set; Aboveground portion from earth's surface downward 0.25 ~ 0.35m and Bu Jicong shaft bottom, down-hole upwards 0.45 ~ 0.65m all use concrete casting; Leacheate is stored in leacheate case 1, and pouring adds pipeline 22 in two-phase vacuum well in two-phase vacuum draw well 11; The concentration of the eluent in leacheate is 0.3 ~ 0.5 of pollutant in soil concentration, and the amount of leacheate is 0.1 ~ 0.5m3/ (dim2);
3) drip washing pipe-line system 7 is arranged on to earth's surface, pipeline upper limb and earth's surface maintain an equal level; Open the first electromagnetic valve 2, leacheate adds at force (forcing) pump 3 micropore 19 of depressing by drip washing pipe-line system 7 and enters soil, and the electromagnetic flowmeter 5 on force (forcing) pump 3 is for regulating the flow of leacheate, the drip washing time be 3 ~ 4 hours once, once continue 20 ~ 40 minutes;
4) stop after drip washing 1 ~ 2 hour, open Vacuum suction pump 10, the leacheate of soil is crossed in drip washing, under the effect of Vacuum suction pump 10, enter two-phase vacuum draw well 11, gas phase directly from two-phase vacuum well the aperture on pipeline 22 21 be sucked into earth's surface, liquid phase enters the bottom of two-phase vacuum draw well 11, along tube wall, be sucked into earth's surface, both enter gas-liquid separator 16, and vapor phase contaminants enters gas phase treatment unit 18, and liguid phase pollutant enters liquid phase processing unit 12; Wherein the swabbing pressure of Vacuum suction pump 10 is the water column of-3 ~-9m, and suction time is 20 ~ 30 minutes.
Described leacheate case 1, force (forcing) pump 3, Vacuum suction pump 10, liquid phase processing unit 12, gas-liquid separator 16, gas phase treatment unit 18 and intelligent electric control system 4 are all arranged on container, can be fixed on van or according to the position in place and install everywhere.
Beneficial effect of the present invention is: device of the present invention is not limited by or not place, is applicable to processing various pollutants, and especially, in the place of processing heavy metal pollution, the clearance of pollutant can be up to more than 75%.Compare with traditional dystopy two-phase vacuum draw restorative procedure, this recovery technique is applicable to different site conditions and different pollution condition.Method of the present invention is compared with traditional recovery technique, has the features such as efficient, energy-conservation, quick.To the clearance that has volatility machine thing to pollute, can reach more than 90%; Construction costs saves traditional 45 ~ 65%; In running, only need several the electric pump electricity consumptions can using electricity wisely cost, operational and administrative expenses saves 25 ~ 35%; All power equipments are taked Based Intelligent Control, practicable unattended, and complete equipment is arranged in container, can repeatedly use.
Accompanying drawing explanation
Fig. 1 is handling process and device schematic diagram;
Fig. 2 is drip washing pipe arrangement schematic diagram;
Fig. 3 is two-phase vacuum draw well construction schematic diagram;
In figure, each label is:
Leacheate case-1, the first electromagnetic valve-2, force (forcing) pump-3, 4-intelligent electric control system, electromagnetic flowmeter-5, the second electromagnetic valve-6, drip washing pipe-line system-7, the 3rd electromagnetic valve-8, well lid-9, Vacuum suction pump-10, two-phase vacuum draw well-11, liquid phase processing unit-12, the first pressure gauge-13, the 4th electromagnetic valve-14, the 5th electromagnetic valve-15, gas-liquid separator-16, the 6th electromagnetic valve-17, gas phase treatment unit-18, pipeline micropore-19, the second pressure gauge-20, aperture-21, pipeline-22 in two-phase vacuum well.
The specific embodiment
Below in conjunction with accompanying drawing and instantiation, the present invention will be further described.
The auxiliary two-phase vacuum suction apparatus of a kind of chemical leaching as Figure 1-3, this device is connected with force (forcing) pump 3 by connecting pipe by leacheate case 1, on pipeline, there is the first electromagnetic valve 2, in force (forcing) pump 3 exits, there are electromagnetic flowmeter 5 and the second electromagnetic valve 6, force (forcing) pump 3 is connected with drip washing pipe-line system 7, and drip washing pipe-line system 7 has micropore 19; On two-phase vacuum draw well 11, have well lid 9, well lid 9 is provided with the second pressure gauge 20; In two-phase vacuum well, pipeline 22 enters in two-phase vacuum draw well 11 by well lid 9, has aperture 21 on pipeline; In two-phase vacuum well, pipeline 22 other ends are connected with Vacuum suction pump 10, the 3rd electromagnetic valve 8 is installed by Bing import department, the 4th electromagnetic valve 14 and the first pressure gauge 13 are installed in Vacuum suction pump 10 exits, Vacuum suction pump 10 is connected with gas-liquid separator 16, gas-liquid separator 16 is connected with gas phase treatment unit 18 with liquid phase processing unit 12 respectively by pipeline, has respectively the 5th electromagnetic valve 15 and the 6th electromagnetic valve 17 on pipeline; Force (forcing) pump 3, electromagnetic flowmeter 5, Vacuum suction pump 10, liquid phase processing unit 12, the first pressure gauge 13, gas-liquid separator 16, gas phase treatment unit 18, the second pressure gauge 20 are connected with intelligent electric control system 4 respectively with all electromagnetic valves, and controlled by intelligent electric control system 4.
Leacheate is stored in leacheate case 1, opens valve 2, and leacheate adds to depress at force (forcing) pump 3 and is pressurized in drip washing pipe-line system 7, and enters into soil by the pipeline micropore 19 on drip washing pipeline.As shown in Figure 2, all tubing is pvc pipe material to drip washing pipe-line system 7; Pipeline micropore is arranged on bottom and downward 60 ° of positions, prevents blockage of the micro orifice.Sprinkle is in soil uniformly to guarantee leacheate, and other equipment is all arranged on container, can be fixed on van, can install everywhere according to the position in place.
Utilize said apparatus to carry out the method for soil remediation, comprise the steps:
1) carry out the investigation of contaminated site, determine hydrogeologic condition and the pollutant physicochemical properties of contaminated site;
2) according to pollution condition, determine eluent and consumption and concentration in leacheate used, two-phase vacuum draw well 11 is set; Aboveground portion from earth's surface downward 0.25 ~ 0.35m and Bu Jicong shaft bottom, down-hole upwards 0.45 ~ 0.65m all use concrete casting; Leacheate is stored in leacheate case 1, and pouring adds pipeline 22 in two-phase vacuum well in two-phase vacuum draw well 11; The concentration of the eluent in leacheate is 0.3 ~ 0.5 of pollutant in soil concentration, and the amount of leacheate is 0.1 ~ 0.5m3/ (dim2);
3) drip washing pipe-line system 7 is arranged on to earth's surface, pipeline upper limb and earth's surface maintain an equal level; Open the first electromagnetic valve 2, leacheate adds at force (forcing) pump 3 micropore 19 of depressing by drip washing pipe-line system 7 and enters soil, and the electromagnetic flowmeter 5 on force (forcing) pump 3 is for regulating the flow of leacheate, the drip washing time be 3 ~ 4 hours once, once continue 20 ~ 40 minutes;
4) stop after drip washing 1 ~ 2 hour, open Vacuum suction pump 10, the leacheate of soil is crossed in drip washing, under the effect of Vacuum suction pump 10, enter two-phase vacuum draw well 11, gas phase directly from two-phase vacuum well the aperture on pipeline 22 21 be sucked into earth's surface, liquid phase enters the bottom of two-phase vacuum draw well 11, along tube wall, be sucked into earth's surface, both enter gas-liquid separator 16, and vapor phase contaminants enters gas phase treatment unit 18, and liguid phase pollutant enters liquid phase processing unit 12; Wherein the swabbing pressure of Vacuum suction pump 10 is the water column of-3 ~-9m, and suction time is 20 ~ 30 minutes.
Leacheate case 1, force (forcing) pump 3, Vacuum suction pump 10, liquid phase processing unit 12, gas-liquid separator 16, gas phase treatment unit 18 and intelligent electric control system 4 are all arranged on container, can be fixed on van or according to the position in place and install everywhere.
Claims (2)
1. a chemical leaching assists two-phase vacuum draw to carry out the method for soil remediation, it is characterized in that, the method is used the auxiliary two-phase vacuum suction apparatus of chemical leaching, described device is connected with force (forcing) pump (3) by connecting pipe by leacheate case (1), on pipeline, there is the first electromagnetic valve (2), in force (forcing) pump (3) exit, there are electromagnetic flowmeter (5) and the second electromagnetic valve (6), force (forcing) pump (3) is connected with drip washing pipe-line system (7), and drip washing pipe-line system (7) has pipeline micropore (19); On two-phase vacuum draw well (11), have well lid (9), well lid (9) is provided with the second pressure gauge (20); Pipeline in two-phase vacuum well (22) enters in two-phase vacuum draw well (11) by well lid (9), has aperture (21) on pipeline; Pipeline in two-phase vacuum well (22) other end is connected with Vacuum suction pump (10), the 3rd electromagnetic valve (8) is installed by Bing import department, the 4th electromagnetic valve (14) and the first pressure gauge (13) are installed in Vacuum suction pump (10) exit, Vacuum suction pump (10) is connected with gas-liquid separator (16), gas-liquid separator (16) is connected with gas phase treatment unit (18) with liquid phase processing unit (12) respectively by pipeline, has respectively the 5th electromagnetic valve (15) and the 6th electromagnetic valve (17) on pipeline; Force (forcing) pump (3), electromagnetic flowmeter (5), Vacuum suction pump (10), liquid phase processing unit (12), the first pressure gauge (13), gas-liquid separator (16), gas phase treatment unit (18), the second pressure gauge (20) and all electromagnetic valves are connected with intelligent electric control system (4) respectively, and controlled by intelligent electric control system (4); Comprise the steps:
1) carry out the investigation of contaminated site, determine hydrogeologic condition and the pollutant physicochemical properties of contaminated site;
2) according to pollution condition, determine eluent and consumption and concentration in leacheate used, two-phase vacuum draw well (11) is set; Aboveground portion from earth's surface downward 0.25～0.35m and Bu Jicong shaft bottom, down-hole upwards 0.45～0.65m all use concrete casting; Leacheate is stored in leacheate case (1), and pouring adds pipeline in two-phase vacuum well (22) in two-phase vacuum draw well (11); The concentration of the eluent in leacheate is 0.3～0.5 of pollutant in soil concentration, and the amount of leacheate is 0.1～0.5m
3/ (dm
2);
3) drip washing pipe-line system (7) is arranged on to earth's surface, pipeline upper limb and earth's surface maintain an equal level; Open the first electromagnetic valve (2), leacheate adds at force (forcing) pump (3) micropore (19) of depressing by drip washing pipe-line system (7) and enters soil, electromagnetic flowmeter (5) on force (forcing) pump (3) is for regulating the flow of leacheate, the drip washing time be 3～4 hours once, once continue 20～40 minutes;
4) stop after drip washing 1～2 hour, open Vacuum suction pump (10), the leacheate of soil is crossed in drip washing, under the effect of Vacuum suction pump (10), enter two-phase vacuum draw well (11), gas phase directly from two-phase vacuum well the aperture (21) on pipeline (22) be sucked into earth's surface, liquid phase enters the bottom of two-phase vacuum draw well (11), along tube wall, be sucked into earth's surface, both enter gas-liquid separator (16), vapor phase contaminants enters gas phase treatment unit (18), and liguid phase pollutant enters liquid phase processing unit (12); Wherein the swabbing pressure of Vacuum suction pump (10) is the water column of-3～-9m, and suction time is 20～30 minutes.
2. method according to claim 1, it is characterized in that, described leacheate case (1), force (forcing) pump (3), Vacuum suction pump (10), liquid phase processing unit (12), gas-liquid separator (16), gas phase treatment unit (18) and intelligent electric control system (4) are all arranged on container, are fixed on van or according to the position in place and install everywhere.
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| CN103433274A (en) * | 2013-08-19 | 2013-12-11 | 百诺纳米科技（苏州）有限公司 | Contaminated soil in-situ remediation system |
| CN103706624B (en) * | 2013-12-18 | 2016-02-24 | 广西大学 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN103785681B (en) * | 2014-02-18 | 2017-02-08 | 江苏江达市政园林建设有限公司 | Method for efficiently remedying heavy metal ion contamination in soil |
| CN104404973A (en) * | 2014-10-31 | 2015-03-11 | 上海岩土工程勘察设计研究院有限公司 | Precipitation method applied to integrated in-situ remediation of polluted water and soil |
| CN104358267B (en) * | 2014-10-31 | 2017-02-01 | 上海岩土工程勘察设计研究院有限公司 | Vacuum tube well precipitation and disposal method for rapidly restoring in-situ water and soil in polluted place |
| CN105935687A (en) * | 2016-05-30 | 2016-09-14 | 青岛理工大学 | Novel pollution site Pb in-situ detoxification method |
| CN106001086A (en) * | 2016-05-30 | 2016-10-12 | 青岛理工大学 | Novel Hg in-situ detoxifying method for contaminated site |
| CN105935685A (en) * | 2016-05-30 | 2016-09-14 | 青岛理工大学 | Novel pollution site Zn in-situ detoxification method |
| CN112808760B (en) * | 2021-03-09 | 2022-04-15 | 河北民族师范学院 | Polluted soil in-situ leaching remediation method based on bionic transpiration |
| CN114985445B (en) * | 2022-05-31 | 2023-08-22 | 董欣欣 | Safety repair system for heavy metal cadmium polluted tidal brown soil |
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| US5050676A (en) * | 1989-09-27 | 1991-09-24 | Xerox Corporation | Process for two phase vacuum extraction of soil contaminants |
| CA2268583A1 (en) * | 1999-04-12 | 2000-10-12 | Nichols Environmental (Canada) Ltd. | In-situ treatment and remediation system and method |
| CN101898198B (en) * | 2009-05-27 | 2012-09-05 | 中国石油天然气集团公司 | Method for remedying oil pollution by unitedly using air shatter crack and microorganism and device thereof |
| CN101921023B (en) * | 2009-06-17 | 2012-07-18 | 中国石油天然气集团公司 | Gas breaking and gas stripping linked double-phase vacuum underground water pumping in-situ repair method |
| CN102249368A (en) * | 2011-04-26 | 2011-11-23 | 华北电力大学 | Two-phase vacuum suction system, and method for treating petroleum pollutants by using two-phase vacuum suction system |
| CN102225429B (en) * | 2011-04-26 | 2012-08-29 | 华北电力大学 | Reinjecting twin-well pneumatic shatter auxiliary restoration system and method of underground oil pollution |
| CN102225422B (en) * | 2011-04-26 | 2012-12-12 | 华北电力大学 | Double-phase vacuum suction simulation system and simulation method thereof |
| CN102228900B (en) * | 2011-05-18 | 2013-06-12 | 华北电力大学 | In situ integrated restoring system and method of petroleum polluted soil |
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