CN110125165B - Ectopic remediation process for VOCs/SVOCs contaminated soil - Google Patents
Ectopic remediation process for VOCs/SVOCs contaminated soil Download PDFInfo
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- CN110125165B CN110125165B CN201910468979.8A CN201910468979A CN110125165B CN 110125165 B CN110125165 B CN 110125165B CN 201910468979 A CN201910468979 A CN 201910468979A CN 110125165 B CN110125165 B CN 110125165B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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Abstract
A different that is used for VOCs/SVOCs to pollute soilThe in-situ remediation process comprises the steps of firstly crushing the VOCs/SVOCs polluted soil, feeding the crushed VOCs/SVOCs polluted soil into a rotary gas stripping furnace, and then adding CO into the rotary gas stripping furnace2CO from rotary stripping furnaces2The spraying pipe is sprayed into a furnace chamber of the rotary gas stripping furnace and is fully contacted with polluted soil, VOCs/SVOCs are stripped out, and the purified soil flows out of the rotary gas stripping furnace under the action of spiral propelling paddles and self gravity in the rotary gas stripping furnace; the gas stripped by the gas is sent to a photocatalyst decomposer after dust is removed by a cloth bag separator, and VOCs/SVOCs are completely decomposed into CO2And H2O，CO2Compressed by a compressor and then circularly enters CO2The method realizes the environment-friendly and efficient remediation of the VOCs/SVOCs polluted soil by recycling in the injection pipe.
Description
Technical Field
The invention relates to the technical field of environmental engineering, in particular to an ex-situ remediation process for VOCs/SVOCs polluted soil.
Background
With the development of economy and the continuous progress of science and technology, people face more and more problems, especially environmental problems, while enjoying the convenience brought by industrialization. The problem of organic pollution of soil is one of the environmental problems which are widely concerned all over the world, and most of organic pollutants are insoluble, toxic, mutagenic and even carcinogenic and have great harm to human health and ecosystem. The organic pollutants may be divided into Volatile Organic Compounds (VOCs), semi-volatile organic compounds (SVOCs) and non-volatile organic compounds according to their volatility, and the VOCs and SVOCs have a great influence on human health.
Sources of organic pollutants in soil include industrial leaks and spills, petroleum and chemical reservoir leaks, pesticide abuse, improper disposal of household garbage, landfill sites and dump sites, and the like. Soil remediation refers to the physical, chemical and biological processes used to transfer, absorb, degrade and transform pollutants in soil to reduce their concentration to acceptable levels, or to transform toxic and harmful pollutants into harmless materials. But due to the characteristics of non-uniformity of soil, diversity of media and the like, the polluted soil remediation is more challenging and uncertain, and the remediation difficulty is correspondingly increased. At present, the most widely applied organic soil remediation technology at home and abroad is the soil vapor extraction and thermal desorption technology, and the treatment effect, cost and period of the technology all meet the requirements of cities on soil remediation. The soil remediation industry in China just starts, the development of treatment technology is immature, and particularly for remediation of soil polluted by organic matters, a relatively perfect remediation process does not exist at present.
Disclosure of Invention
In order to overcome the defects existing in the existing soil remediation, the invention aims to provide an ectopic remediation process for VOCs/SVOCs contaminated soil, and the environment-friendly and efficient remediation of the VOCs/SVOCs contaminated soil is realized.
In order to achieve the purpose, the invention adopts the technical scheme that:
an ex-situ remediation process for VOCs/SVOCs contaminated soil comprises the steps of firstly crushing the contaminated soil of the VOCs/SVOCs, sending the crushed soil into a rotary gas stripping furnace 3, and then adding CO2From CO in the rotary stripping furnace 32The injection pipe 32 is injected into the furnace cavity of the rotary gas stripping furnace 3, fully contacts with the polluted soil, the VOCs/SVOCs are stripped, and the purified soil flows out of the rotary gas stripping furnace 3 under the action of the spiral propulsion paddle 31 and the self gravity in the rotary gas stripping furnace 3; the gas stripped out is sent to a photocatalyst decomposer 5 after dust is removed by a cloth bag separator 4, and VOCs/SVOCs are completely decomposed into CO2And H2O，CO2Is compressed by a compressor 6 and then circularly entersCO2The injection pipe 32 is recycled.
An ex-situ remediation process for VOCs/SVOCs contaminated soil, comprising the following steps:
in the first step, contaminated soil with mechanically ground VOCs/SVOCs having a particle size of not more than 2 meshes is conveyed by a conveyor belt 1 at a speed of 5m3The speed of the reaction is/h, the reaction product is fed into the rotary gas stripping furnace 3 and then is uniformly distributed in the furnace cavity of the rotary gas stripping furnace 3 under the stirring of the spiral propelling paddle 31 in the rotary gas stripping furnace 3;
secondly, adding CO with the pressure of more than 1MPa2From CO210m in the storage tank 23CO at a rate/h fed into a rotary stripping furnace 32In the injection pipe 32, CO is passed2 Injection pipe 32 for CO2The gas is uniformly distributed in the rotary gas stripping furnace 3 until the pollution concentration of the polluted soil reaches the designed purification standard, and the VOCs/SVOCs are treated by CO2The soil is discharged from an upper outlet of the rotary gas stripping furnace 3, and the purified soil after being stripped is discharged from a lower outlet of the rotary gas stripping furnace 3;
thirdly, discharging CO from the upper outlet of the rotary gas stripping furnace 32And VOCs/SVOCs and dust are introduced into the bag-type dust collector 4, the dust is intercepted by the bag 41 in the bag-type dust collector 4, the dust flows out from the lower outlet of the bag-type dust collector 4, the dedusted gas enters the photocatalytic decomposer 5, and the VOCs/SVOCs are decomposed into carbon dioxide and water, CO and CO in the photocatalytic decomposer 52Compressed by a compressor 6 and delivered to CO2The ejector tube 32 is recycled.
The CO is2The lower part of the injection pipe 32 is provided with micropores with the diameter of 5mm, and the micropores are positioned in CO2The opening ratio on the injection pipe 32 was 35%.
The photocatalytic decomposer 5 is internally and alternately paved with and coated with nano TiO2The carbon fiber cloth 51 and the LED ultraviolet lamp 52 are coated with nano TiO2The carbon fiber cloth 51 and the LED ultraviolet lamps 52 are respectively paved into 10 layers.
The spiral propeller 31 in the rotary stripping furnace 3 is driven by a motor to continuously rotate, and the inclination angle of the rotary stripping furnace 3 is set to be 15 degrees.
The bag-type dust collector 4 is provided with a rapping device which is used for continuously removing the intercepted dust.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts CO2Stripping VOCs/SVOCs in contaminated soil due to CO2Due to the particularity of the soil remediation system, the VOCs/SVOCs can be carried out from the polluted soil, and the environment-friendly and efficient remediation of the VOCs/SVOCs polluted soil is realized.
2. According to the invention, the spiral propelling paddle 31 is arranged in the rotary gas stripping furnace 3, so that the polluted soil can be uniformly distributed in the rotary gas stripping furnace 3, and the improvement of CO is facilitated2The air stripping effect of (1). In addition, the rotary gas stripping furnace 3 is provided with an inclination angle of 15 degrees, so that the purified soil can flow out of the rotary gas stripping furnace 3.
3. The method adopts photocatalysis to treat the VOCs/SVOCs, the photocatalysis efficiency is high, and products after the treatment of the VOCs/SVOCs are carbon dioxide and water, so that secondary pollution to the environment can not be caused; in addition, the CO produced by the photocatalytic process2And CO used for stripping2The compressed gas can be recycled after being compressed by the compressor 6.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
Referring to fig. 1, an ex-situ remediation process for VOCs/SVOCs contaminated soil comprises the following steps:
in the first step, contaminated soil (VOCs/SVOCs concentration is 2100-2600mg/kg) with mechanically pulverized particle size not larger than 2 meshes is conveyed by a conveyor belt 1 at 5m3The speed of the reaction is/h, the reaction product is fed into the rotary gas stripping furnace 3 and then is uniformly distributed in the furnace cavity of the rotary gas stripping furnace 3 under the stirring of the spiral propelling paddle 31 in the rotary gas stripping furnace 3;
the spiral propeller 31 in the rotary stripping furnace 3 is driven by a motor to continuously rotate, the inclination angle of the rotary stripping furnace 3 is set to be 15 degrees, and purified soil can flow out of the rotary stripping furnace 3;
second, the pressure is greater than1MPa of CO2From CO210m in the storage tank 23CO at a rate/h fed into a rotary stripping furnace 32In the injection pipe 32, CO is passed2 Injection pipe 32 for CO2Gas is uniformly distributed in a rotary gas stripping furnace 3, VOCs/SVOCs in the polluted soil are extracted, and after 30min gas stripping, the total concentration of the VOCs/SVOCs in the polluted soil reaches below 50mg/Kg, and the VOCs/SVOCs are coated with CO2The soil is discharged from an upper outlet of the rotary gas stripping furnace 3, and the purified soil after being stripped is discharged from a lower outlet of the rotary gas stripping furnace 3;
the CO is2The lower part of the injection pipe 32 is provided with micropores, the diameter of which is 5mm and the micropores are in CO for preventing the micropores from being blocked by soil particles2The opening ratio on the injection pipe 32 is 35%;
thirdly, discharging CO from the upper outlet of the rotary gas stripping furnace 32And VOCs/SVOCs and a small amount of dust gas are introduced into the bag-type dust collector 4, the dust is intercepted by the bag 41 in the bag-type dust collector 4, the bag-type dust collector 4 is provided with a rapping device, the rapping device is used for uninterruptedly removing the intercepted dust, the dust flows out from the lower outlet of the bag-type dust collector 4, the dust-removed gas enters the photocatalytic decomposer 5 again, the VOCs/SVOCs are decomposed into carbon dioxide and water in the photocatalytic decomposer 5, and CO is2Compressed by a compressor 6 and delivered to CO2The injection pipe 32 is recycled;
the photocatalytic decomposer 5 is internally and alternately paved with and coated with nano TiO2The carbon fiber cloth 51 and the LED ultraviolet lamp 52 are coated with nano TiO2The carbon fiber cloth 51 and the LED ultraviolet lamps 52 are respectively paved by 10 layers, so that the VOCs/SVOCs can be completely decomposed.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the scope of the present invention is defined by the claims.
Claims (4)
1. Ectopic remediation for VOCs/SVOCs contaminated soilThe process is characterized in that: firstly, the VOCs/SVOCs polluted soil is crushed and sent into a rotary gas stripping furnace (3), and then CO is added2From CO in a rotary stripping furnace (3)2The injection pipe (32) is injected into the furnace cavity of the rotary stripping furnace (3) and is fully contacted with the polluted soil to strip out VOCs/SVOCs, and the purified soil flows out of the rotary stripping furnace (3) under the action of a spiral propulsion paddle (31) and self gravity in the rotary stripping furnace (3); the gas stripped by the gas is sent to a photocatalytic decomposer (5) after dust is removed by a bag-type dust remover (4), and VOCs/SVOCs are completely decomposed into CO2And H2O，CO2Compressed by a compressor (6) and then circularly enters CO2Recycling in the injection pipe (32);
the ex-situ remediation process for VOCs/SVOCs contaminated soil comprises the following steps:
in the first step, the contaminated soil with the grain size not larger than 2 meshes of VOCs/SVOCs after mechanical grinding is conveyed by a conveyor belt (1) at the speed of 5m3The reaction solution is fed into a rotary stripping furnace (3) at a speed of/h, and then is uniformly distributed in a furnace cavity of the rotary stripping furnace (3) under the stirring of a spiral propelling paddle (31) in the rotary stripping furnace (3);
secondly, adding CO with the pressure of more than 1MPa2From CO210m in the storage tank (2)3CO fed to a rotary stripping furnace (3) at a rate of/h2In the injection pipe (32), CO is passed2Injection pipe (32) for CO2The gas is uniformly distributed in the rotary gas stripping furnace (3) until the pollution concentration of the polluted soil reaches the designed purification standard, and the VOCs/SVOCs are treated by CO2The soil is discharged from an upper outlet of the rotary stripping furnace (3), and the purified soil after being stripped is discharged from a lower outlet of the rotary stripping furnace (3);
thirdly, discharging CO from the upper outlet of the rotary gas stripping furnace (3)2And gas of VOCs/SVOCs and dust is introduced into the bag-type dust collector (4), the dust is intercepted by the bag (41) in the bag-type dust collector (4), the dust flows out from the lower outlet of the bag-type dust collector (4), the gas after dust removal enters the photocatalytic decomposer (5), the VOCs/SVOCs are decomposed into carbon dioxide and water in the photocatalytic decomposer (5), and CO is2Compressed by a compressor (6) and then delivered to CO2The injection pipe (32) is recycled;
the photocatalytic decomposer (5) is internally and alternately paved with and coated with nano TiO2The carbon fiber cloth (51) and the LED ultraviolet lamp (52) are coated with nano TiO2The carbon fiber cloth (51) and the LED ultraviolet lamp (52) are respectively paved into 10 layers.
2. The ex-situ remediation process for VOCs/SVOCs contaminated soil of claim 1, wherein: the CO is2Micropores with the diameter of 5mm are arranged below the injection pipe (32) and are positioned in the CO2The opening ratio of the injection pipe (32) is 35%.
3. The ex-situ remediation process for VOCs/SVOCs contaminated soil of claim 1, wherein: the spiral propeller (31) in the rotary stripping furnace (3) is driven by a motor to continuously rotate, and the inclination angle of the rotary stripping furnace (3) is set to be 15 degrees.
4. The ex-situ remediation process for VOCs/SVOCs contaminated soil of claim 1, wherein: the bag-type dust collector (4) is provided with a rapping device, and the rapping device is used for continuously removing intercepted dust.
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| CN110125165B true CN110125165B (en) | 2021-07-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5198000A (en) * | 1990-09-10 | 1993-03-30 | The University Of Connecticut | Method and apparatus for removing gas phase organic contaminants |
| CN102350438B (en) * | 2011-07-15 | 2012-10-10 | 沈阳环境科学研究院 | System for continuous desorption and purification of VOCs in soil |
| CN103230932A (en) * | 2013-04-11 | 2013-08-07 | 华北电力大学 | A device for remediation of organic contaminated soil by using supercritical CO2 fluid and a remediation method |
| CN106693634A (en) * | 2015-11-17 | 2017-05-24 | 江苏中科睿赛污染控制工程有限公司 | Device and method for treating VOCs (Volatile Organic Compounds) |
| CN107661898B (en) * | 2016-07-28 | 2021-01-29 | 河北建楚环境工程有限公司 | Device and method for repairing organic contaminated soil by using supercritical multi-fluid |
| CN106178875A (en) * | 2016-08-16 | 2016-12-07 | 南京格洛特环境工程股份有限公司 | A kind of technique of uviol lamp intensive treatment volatile organic waste gas |
| CN107282622B (en) * | 2017-08-17 | 2023-06-20 | 科海思（北京）科技有限公司 | Device and method for repairing soil VOCs pollution |
| CN107983765B (en) * | 2017-12-19 | 2020-08-04 | 中石化炼化工程（集团）股份有限公司 | Organic contaminated soil remediation system and process |
| CN108870424A (en) * | 2018-07-17 | 2018-11-23 | 长沙奥邦环保实业有限公司 | A kind of soil restoring device and its restorative procedure |
| CN108889072B (en) * | 2018-07-24 | 2021-01-26 | 苏州市吴江新宇电工材料有限公司 | Method for treating industrial VOCs waste gas |
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