CN103624072A - Radio-frequency heating vapor-extraction advanced-oxidation in-situ restoration apparatus suitable for high-viscosity contaminated soil and restoration method thereof - Google Patents
Radio-frequency heating vapor-extraction advanced-oxidation in-situ restoration apparatus suitable for high-viscosity contaminated soil and restoration method thereof Download PDFInfo
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Abstract
The invention discloses a radio-frequency heating vapor-extraction advanced-oxidation in-situ restoration apparatus suitable for high-viscosity contaminated soil and a restoration method thereof. The apparatus comprises multiple heating extractors and injection pipes; each heating extractor comprises an extraction pipe and a heating pipe; a radio-frequency electrode is arranged in the heating pipe and is connected with an adapter and a radio-frequency launcher; the outer shell of the extraction pipe is provided with a hole; the inner wall of the extraction pipe is provided with grids; the upper parts of all of the extraction pipes are connected together and connected with a condensation unit, a gas-liquid separator and a vacuum pump in sequence. The restoration method comprises: arranging the multiple heating extractors and the injection pipes, and keeping the distance between per two heating extractors at 2-5 m; respectively injecting calcium carbonate powder with an addition amount of 10%-15% and a sodium persulfate solution with an addition amount 20%-25% into the contaminated soil; and performing intermittent extraction with a heating temperature of 100-500 DEG C and a heating time of 100-140 h. According to the technical scheme, the restoration effect on the high-viscosity contaminated soil is obvious in a short time, the pollutant removing rate is high, the heating is rapid, the restoration time is short and the restoration efficiency is high.
Description
Technical field
The invention belongs to contaminated soil recovery technique field, relate to a kind of radio frequency heating gas phase extracting advanced oxidation in-situ repairing device and restorative procedure and repair materials that is applicable to volatility and semi-volatile organic matter high viscosity contaminated soil.
Background technology
The features such as in high viscosity soil, volatile organic matter and semi-volatile organic matter have long half time, absorption affinity is strong and difficult, there are the polluting property and the harmfulness that are different from other pollutants, are listed in the toxic pollutant that potentially danger in environment is large, should preferentially control.This pollutant can threaten underground water source water quality safety, contaminated air, change soil characteristic, harm the crops, meanwhile, the hydrocarbon gas accumulate in building is underground may be explosion caused, and make with leak the public land that hydrocarbon compound contacts under pipe network facilities accelerated ageing.
Although China not yet puts into effect corresponding standard and statute VOCs-contaminated Soils is controlled, but in the domestic flourishing city of the minorities such as Shanghai, the harm problem of volatile organic matter has caused the great attention of government department, and how disposing rationally and effectively organic material contaminated soil has become the technical barrier of needing solution badly.
Summary of the invention
The object of the invention is to: a kind of radio frequency heating gas phase extracting advanced oxidation in-situ repairing device and restorative procedure that is applicable to volatility and semi-volatile organic matter high viscosity contaminated soil is provided, and to solve, remediation efficiency in the processing procedure of volatility and semi-volatile organic matter high viscosity contaminated soil in prior art is low, the technical problem of length consuming time.
Technical scheme of the present invention is as follows:
A radio frequency heating gas phase extracting advanced oxidation in-situ repairing device that is applicable to high viscosity contaminated soil, it comprises one or more injection-tubes, and is arranged in injection-tube a plurality of heating extractors around; Each heating extractor comprise extraction tube and be located at the heating tube in extraction tube, radio-frequency electrode is placed in heating tube, radio-frequency electrode is connected with adaptation by coaxial cable, adaptation is connected with radiofrequency launcher by coaxial cable; On extraction tube shell, there are a plurality of perforates; In extraction tube, filler and catalyst are equipped with in heating tube outside; Extraction tube inwall is provided with one deck width of mesh than filler and the little grid of catalyst particle size; The extracting tube connector on all extraction tubes top links together, and is sequentially connected with condensing unit, gas-liquid separator, vavuum pump.
Can be rounded, oval between injection-tube and heating extractor, the arranged distribution mode of polygon or other form; Circular arranged distribution mode (be injection-tube at center, a plurality of heating extraction devices are distributed on circumference); More preferably (heat extractor has seven to regular hexagon arranged distribution mode, is distributed on orthohexagonal six points and central point; Injection-tube has six, is distributed in six leg-of-mutton centers that form after regular hexagon diagonal angle line).
Above-mentioned heating extractor is a kind of volatile organic matter prosthetic appliance that integrates radio frequency heating, two kinds of functions of negative pressure extraction, and the power of radio frequency heating can customize according to the difference of field condition.
A radio frequency heating gas phase extracting advanced oxidation in-situ remediation method that is applicable to high viscosity contaminated soil that uses above-mentioned prosthetic device, it comprises the steps:
(1) according to contaminated soil place concrete condition, a plurality of heating extractors and injection-tube are arranged in reparation place (circular or regular hexagon arranged distribution mode), and the spacing between a plurality of heating extractors is 2～5 meters (fixed according to place concrete condition);
(2) the extracting tube connector of all heating extractors is linked together, be merged into a shared tube connector, then this shared tube connector is sequentially connected with condensing unit, gas-liquid separator and vavuum pump;
(3) calcium carbonate powder after grinding is directly injected in high viscosity contaminated soil by injection-tube, adding proportion is soil quality 10%～15%;
(4) the sodium peroxydisulfate solution that is 30% by mass concentration is directly injected in high viscosity contaminated soil by injection-tube, and adding proportion is soil quality 20%～25%;
(5) the first preheated one-section time, then in heating, open vavuum pump and carry out extracting, adopting intermittently extracting mode, the temperature of controlling heating source is 100～500 ℃, 100～140 hours heat times; Under negative pressure state, by the vapours extracting, through condensing unit, gas-liquid separator, finally enter in tail gas treatment device and process.
Preferred version: in said method, intermittently extracting mode is: every extracting is after 12 hours, and take out for 12 hours again at interval; The temperature of controlling heating source is 200 ℃; 120 hours heat times; Can be to carrying out the recovery of organic phase from gas-liquid separator condensate liquid out.
Beneficial effect of the present invention:
The present invention's employing is injected at the compound repair materials by calcium carbonate powder and sodium peroxydisulfate solution composition around heating/extraction well, activated the oxidation susceptibility of compound repair materials, strengthen the degraded of semi-volatile organic matter, meanwhile improved the good diffusion of composite repairing material in soil media.Repair materials A calcium carbonate powder is first injected in soil by injection-tube, absorbs the moisture in soil, is convenient to the transmission of follow-up repair materials B sodium peroxydisulfate solution in soil.The present invention is obvious to high viscosity contaminated soil repairing effect at short notice, and pollutants removal rate is high.
The present invention adopts radio frequency heating, and its advantage is heating rapidly, and repair time is short, and remediation efficiency is high.Traditional Resistant heating principle is that resistance wire itself produces high temperature, then heat high-temperature region, center from heating source is slowly transmitted to the appearance low-temperature space of heating source again, speed is slow, and the actual temperature and the appearance temperature that are positioned at heating source center have larger error, although resistance wire stops heating when heating-up temperature reaches requirement, owing to there being temperature error, heating source still continues to soil conduction heat, cause temperature to be controlled inaccurate, affected remediation efficiency; And the operation principle of radio frequency heating system is high-frequency induction, heated object is the current heating by self, heat energy is to produce by heating object is whole, temperature is controlled in real time accurately, heating source internal and external temperature is consistent, obviously improved remediation efficiency, the shortcoming such as repair time of having overcome traditional resistor silk heating technique is long, efficiency is low.
Accompanying drawing explanation
The plan structure schematic diagram of Fig. 1 radio frequency heating gas phase of the present invention extracting advanced oxidation in-situ repairing device, that is the arranged distribution figure of heating extractor and injection-tube;
Injection-tube in Fig. 2 in-situ repairing device of the present invention and the schematic diagram of heating extractor in underground pollution soil;
The master of the heating extractor in Fig. 3 the present invention looks cross-sectional view;
The external view of the extraction tube in Fig. 4 the present invention.
In figure: 1, heating tube 2, radiofrequency launcher 3, adaptation 4, coaxial cable
5, radio-frequency electrode 6, extraction tube 7, extraction tube shell perforate 8, extracting tube connector
9, the perforate on heating extractor 10, injection-tube 11, injection-tube tube wall
12, filler and catalyst 13, grid
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment 1:
As shown in Fig. 1-4, a kind of radio frequency heating gas phase extracting advanced oxidation in-situ repairing device that is applicable to high viscosity contaminated soil of the present invention, it comprises by the injection-tube of arranged in regular hexagon shape 10 and heating extractor 9(heating extractor 9 seven, is distributed on orthohexagonal six points and central point; Injection-tube 10 has six, is distributed in six leg-of-mutton centers that form after regular hexagon diagonal angle line); Each heating extractor comprises extraction tube 6 and is located at the heating tube 1 in extraction tube, and radio-frequency electrode 5 is placed in heating tube 1, and radio-frequency electrode is connected with adaptation 3 by coaxial cable 4, and adaptation 3 passes through coaxial cable 4 and is connected with radiofrequency launcher 2; On extraction tube shell, there are a plurality of perforates (being extraction tube shell perforate 7); Filler and catalyst 12 are equipped with in the interior heating tube of extraction tube 61 outside; Extraction tube inwall is provided with one deck width of mesh than filler and the little grid 13 of catalyst particle size; The extracting tube connector 8 on all extraction tubes top links together, and is sequentially connected with condensing unit, gas-liquid separator, vavuum pump.Injection-tube tube wall is provided with perforate (being the perforate 11 on injection-tube tube wall).
Embodiment 2:
" a kind of radio frequency heating gas phase extracting advanced oxidation in-situ repairing device that is applicable to high viscosity contaminated soil " application in repairing Cao Lu town chemical plant volatility and semi-volatile organic matter pollution high viscosity soil in the present invention
Be positioned at Shanghai Pudong New Area Cao Luzhen Cao Luji, to the east of road high up in the air, reach golden sea route in the south, to Pudong canal, Bei Zhidongjing road (seeing Fig. 2-1).
Investigation finds to have chemical plant, Yi Geyuangu road in base range.Plot, chemical plant is " L " type, and thing is about 160m, the widest about 105m in east, and the widest about 69m in western part, floor space is about 13445m
2.Contaminated area is about 4513 square metres.
Restorative procedure is as follows:
(1) according to contaminated soil place concrete condition, a plurality of heating extractors and injection-tube are distributed in and are repaired in place by circular arrangement, the spacing between a plurality of heating extractors is 2～5 meters;
(2) the extracting tube connector of all heating extractors is linked together, be merged into a shared tube connector, then this shared tube connector is sequentially connected with condensing unit, gas-liquid separator and vavuum pump;
(3) calcium carbonate powder after grinding is directly injected in high viscosity contaminated soil by injection-tube, adding proportion is soil quality 12.5%;
(4) the sodium peroxydisulfate solution that is 30% by the mass concentration being mixed with by deionized water is directly injected in high viscosity contaminated soil by injection-tube, and adding proportion is soil quality 22.5%;
(5) the first preheated one-section time, then in heating, open vavuum pump and carry out extracting, adopting intermittently extracting mode, the temperature of controlling heating source (being heating tube) is 200 ℃, 120 hours heat times; Under negative pressure state, by the vapours extracting, through condensing unit, gas-liquid separator, finally enter in tail gas treatment device and process.
Repair materials A calcium carbonate powder is injected in soil by injection-tube, absorbs the moisture in soil, is convenient to the transmission of follow-up repair materials B sodium peroxydisulfate solution in soil.Be accompanied by heat and negative pressure extraction that heating extractor discharges, half volatile and volatile organic matter in soil are fully degraded.
In case, the project of pedotheque analysis is mainly semi-volatile organic matter (two (2-ethylhexyl) phthalate ester, carbazole, azobenzene and N-nitroso di-n-propylamine) and volatile organic matter (chloroform, benzene, 1,2-dichloroethanes and 1,2,3-trichloropropane).The analytical standard adopting in analytic process, instrument title, instrument model etc. are as shown in table 1.Soil pollutant content after reparation is in Table 2.
Table 1 pedotheque analytical parameters, method and instrument
| Test name | Method | Instrument title | Instrument model |
| Semi-volatile organic matter | USEPA8270D-2007 | Chromatography of gases-GC-MS | 6890/5973N |
| Volatile organic matter | USEPA8260B-1996 | Chromatography of gases-GC-MS | 6890/5975 |
Note: USEPA is American National Environmental Protection Agency method.
Soil pollutant content after table 2 is repaired
Embodiment 3-14:
Contaminated site, prosthetic device, restorative procedure are substantially with embodiment 2, and concrete operations condition is different.
Concrete operations condition and experimental result are in Table 3.
Under table 3 different operating condition, the variation (mg/Kg) of front and back sample point benzene concentration is processed in experiment
Embodiment 15-26:
Contaminated site, prosthetic device, restorative procedure are substantially with embodiment 2, and difference is:
A plurality of heating extractors and injection-tube are pressed regular hexagon arranged distribution in repairing place; Concrete operations condition is different.
Concrete operations condition and experimental result are in Table 4.
Under table 4 different operating condition, the variation (mg/Kg) of front and back sample point chloroform concentration is processed in experiment
Claims (9)
1. a radio frequency heating gas phase extracting advanced oxidation in-situ repairing device that is applicable to high viscosity contaminated soil, is characterized in that: it comprises one or more injection-tubes, and is arranged in injection-tube a plurality of heating extractors around; Each heating extractor comprise extraction tube and be located at the heating tube in extraction tube, radio-frequency electrode is placed in heating tube, radio-frequency electrode is connected with adaptation by coaxial cable, adaptation is connected with radiofrequency launcher by coaxial cable; On extraction tube shell, there are a plurality of perforates; In extraction tube, filler and catalyst are equipped with in heating tube outside; Extraction tube inwall is provided with one deck width of mesh than filler and the little grid of catalyst particle size; The extracting tube connector on all extraction tubes top links together, and is sequentially connected with condensing unit, gas-liquid separator, vavuum pump.
2. the radio frequency heating gas phase extracting advanced oxidation in-situ repairing device that is applicable to high viscosity contaminated soil as claimed in claim 1, is characterized in that: between injection-tube and heating extractor by circle or regular hexagon arranged distribution.
3. the radio frequency heating gas phase extracting advanced oxidation in-situ repairing device that is applicable to high viscosity contaminated soil as claimed in claim 1 or 2, is characterized in that: injection-tube tube wall is provided with perforate.
4. the radio frequency heating gas phase extracting advanced oxidation in-situ repairing device that is applicable to high viscosity contaminated soil as claimed in claim 1 or 2, is characterized in that: the spacing between a plurality of heating extractors is 2～5 meters.
5. a radio frequency heating gas phase extracting advanced oxidation in-situ remediation method that is applicable to high viscosity contaminated soil for the prosthetic device of use as described in claim 1-4, is characterized in that, it comprises the steps:
(1), according to contaminated soil place concrete condition, by a plurality of heating extractors and injection-tube arranged distribution, in repairing place, the spacing between a plurality of heating extractors is 2～5 meters;
(2) the extracting tube connector of all heating extractors is linked together, be merged into a shared tube connector, then this shared tube connector is sequentially connected with condensing unit, gas-liquid separator and vavuum pump;
(3) calcium carbonate powder after grinding is directly injected in high viscosity contaminated soil by injection-tube, adding proportion is soil quality 10%～15%;
(4) the sodium peroxydisulfate solution that is 30% by mass concentration is directly injected in high viscosity contaminated soil by injection-tube, and adding proportion is soil quality 20%～25%;
(5) the first preheated one-section time, then in heating, open vavuum pump and carry out extracting, adopting intermittently extracting mode, the temperature of controlling heating source is 100～500 ℃, 100～140 hours heat times; Under negative pressure state, by the vapours extracting, through condensing unit, gas-liquid separator, finally enter in tail gas treatment device and process.
6. the radio frequency heating gas phase extracting advanced oxidation in-situ remediation method that is applicable to high viscosity contaminated soil as claimed in claim 5, is characterized in that, presses circle or arranged in regular hexagon shape between a plurality of heating extractors and injection-tube.
7. the radio frequency heating gas phase extracting advanced oxidation in-situ remediation method that is applicable to high viscosity contaminated soil as claimed in claim 6, is characterized in that, intermittently extracting mode is: every extracting is after 12 hours, and take out for 12 hours again at interval.
8. the radio frequency heating gas phase extracting advanced oxidation in-situ remediation method that is applicable to high viscosity contaminated soil as claimed in claim 7, is characterized in that, the temperature of controlling heating source is 200 ℃; 120 hours heat times.
9. the radio frequency heating gas phase extracting advanced oxidation in-situ remediation method that is applicable to high viscosity contaminated soil as claimed in claim 8, is characterized in that, to carrying out the recovery of organic phase from gas-liquid separator condensate liquid out.
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| CN105444159A (en) * | 2015-11-09 | 2016-03-30 | 北京建工环境修复股份有限公司 | In-situ deep-layer heating device and in-situ heating soil decontamination device with same |
| CN106734153A (en) * | 2017-01-18 | 2017-05-31 | 北京高能时代环境技术股份有限公司 | For thermal desorption processing system in situ and method that contaminated soil is carried out with heat exchange pattern |
| CN107691419A (en) * | 2017-10-27 | 2018-02-16 | 农业部南京农业机械化研究所 | A kind of remote control self-walking soil radio frequency processing machine |
| CN109226227A (en) * | 2018-08-31 | 2019-01-18 | 中科鼎实环境工程股份有限公司 | Ultraviolet light heating gas phase suitable for polycyclic aromatic hydrocarbon pollution extracts prosthetic device |
| CN109382399A (en) * | 2018-12-19 | 2019-02-26 | 长沙凯天工研院环保服务有限公司 | Auxiliary heating system for extraction tube in the reparation of soil in-situ thermal desorption |
| CN111229803A (en) * | 2020-01-13 | 2020-06-05 | 中国石油化工股份有限公司 | In-situ thermal desorption device and in-situ thermal desorption system |
| CN111672893A (en) * | 2020-04-07 | 2020-09-18 | 江苏大天环境科技有限公司 | Indirect thermal desorption process for contaminated soil remediation |
| CN113333447A (en) * | 2021-05-27 | 2021-09-03 | 中国科学院沈阳应用生态研究所 | In-situ application matching device and method for soil vapor extraction degradation restoration technology |
| CN114309039A (en) * | 2021-12-30 | 2022-04-12 | 北京建工环境修复股份有限公司 | Soil remediation system and soil remediation method |
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| CN105444159A (en) * | 2015-11-09 | 2016-03-30 | 北京建工环境修复股份有限公司 | In-situ deep-layer heating device and in-situ heating soil decontamination device with same |
| CN106734153A (en) * | 2017-01-18 | 2017-05-31 | 北京高能时代环境技术股份有限公司 | For thermal desorption processing system in situ and method that contaminated soil is carried out with heat exchange pattern |
| CN107691419B (en) * | 2017-10-27 | 2024-01-30 | 农业部南京农业机械化研究所 | Remote control self-propelled soil radio frequency processor |
| CN107691419A (en) * | 2017-10-27 | 2018-02-16 | 农业部南京农业机械化研究所 | A kind of remote control self-walking soil radio frequency processing machine |
| CN109226227A (en) * | 2018-08-31 | 2019-01-18 | 中科鼎实环境工程股份有限公司 | Ultraviolet light heating gas phase suitable for polycyclic aromatic hydrocarbon pollution extracts prosthetic device |
| CN109382399A (en) * | 2018-12-19 | 2019-02-26 | 长沙凯天工研院环保服务有限公司 | Auxiliary heating system for extraction tube in the reparation of soil in-situ thermal desorption |
| CN109382399B (en) * | 2018-12-19 | 2021-02-26 | 长沙工研院环保有限公司 | Auxiliary heating system for extraction pipe in soil in-situ thermal desorption repair |
| CN111229803A (en) * | 2020-01-13 | 2020-06-05 | 中国石油化工股份有限公司 | In-situ thermal desorption device and in-situ thermal desorption system |
| CN111672893A (en) * | 2020-04-07 | 2020-09-18 | 江苏大天环境科技有限公司 | Indirect thermal desorption process for contaminated soil remediation |
| CN113333447B (en) * | 2021-05-27 | 2022-04-12 | 中国科学院沈阳应用生态研究所 | In-situ application matching device and method for soil vapor extraction degradation restoration technology |
| CN113333447A (en) * | 2021-05-27 | 2021-09-03 | 中国科学院沈阳应用生态研究所 | In-situ application matching device and method for soil vapor extraction degradation restoration technology |
| CN114309039A (en) * | 2021-12-30 | 2022-04-12 | 北京建工环境修复股份有限公司 | Soil remediation system and soil remediation method |
| CN114309039B (en) * | 2021-12-30 | 2022-12-02 | 北京建工环境修复股份有限公司 | Soil remediation system and soil remediation method |
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Application publication date: 20140312 |