CN105457993A - Method for restoring organically polluted soil - Google Patents
Method for restoring organically polluted soil Download PDFInfo
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- CN105457993A CN105457993A CN201410409439.XA CN201410409439A CN105457993A CN 105457993 A CN105457993 A CN 105457993A CN 201410409439 A CN201410409439 A CN 201410409439A CN 105457993 A CN105457993 A CN 105457993A
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Abstract
The invention discloses a method or restoring organically polluted soil. The method comprises a polluted soil concentrated storage and transportation process, a chemical strengthening treatment process, a polluted tail gas treatment process and a soil acceptance and transshipment process. Volatilization of pollutants is commonly promoted in a chemical and physical combination mode under the action of heat released by a chemical reaction and mechanical overturning sieving by using the characteristics of easy volatilization of organic pollutants in soil after the soil is heated, and pollutants-containing gases undergo cloth bag dedusting and active carbon adsorbing treatment by using forced extraction of a vacuum blower to realize standard reaching discharge of tail gas, so polluted soil restoration is finally realized. An engineering enforcement result shows that compared with other restoration methods, the method disclosed in the invention has the advantages of reaching of an expected treatment purpose through using small device investment, and wide application prospect.
Description
Technical field
The invention belongs to environmental technology field, relate to a kind of method of renovation of organic pollution soil.
Background technology
Soil and groundwater is not only important agricultural production resources, is also important environmental key-element, is the natural resources that the mankind depend on for existence.Tellurian soil be various artificially with natural pollutant collect body, in environment, most pollutant finally can be trapped in soil, thus causes soil environment to go from bad to worse.Along with the fast development of petroleum industry and chemical engineering industry, organic substance is more and more serious to the pollution of soil, and has exceeded heavy metal pollution and radioactive pollution and leapt to the first, and defines the contaminated site of One's name is legion.The investigation of contaminated site and repair the environment difficulties that become international, and more and more cause the attention of people.
Organic pollution in the soil of place is mainly derived from: (1) oil exploration and exploitation, to store and in transportation, because misoperation or accident reveal the oil discharge or excessive caused; (2) ground such as oil, Chemical Manufacture district, gas station formed landing oil, the discharge of oil-containing production waste and oil pipeline seepage; (3) chemicals production such as chemical plant, insecticide factory enterprise, the raw material caused in transit at workshop, packing workshop, drug stock control warehouse and on-site and medicine are revealed, and the raw material that discharges of the industry such as printing, building materials, spraying and waste water.If do not administered in time above-mentioned contaminated site, then can cause serious underground water pollution, difficulty of governance in the future and expense will be multiplied.
At present, unit or individual has been had to carry out some researchs about organic polluted soil recovery technique.Patent CN1290632C discloses a kind of volatility and half volatile organic polluted soil Processing tecchnics and device outside the venue, by soil being excavated from place and inserting in a container, the pollutant be adsorbed in soil volatilizees to utilize electrical heating and vacuum extraction to impel, take away with gas phase, finally realize the target of soil remediation, but this technique electrical heating power consumption is huge, and cost is higher.Patent CN1185055C discloses a kind of pollution soil steam treatment method and device, the method by being configured to mud by contaminated soil in a container, slush pump is utilized to pump slurry into high-pressure reactor, electrical heating is to 200-300 DEG C, make polycyclic aromatic hydrocarbon pollutant desorption from soil, enter steam, the soil after purification is separated by separator, discharges; Polyaromatic hydrocarbon pollutant and water vapor condensation, be separated through Liquid liquid Separation device and discharge, finally realize the reparation of contaminated soil.The shortcoming of the method is the water that soil is configured to mud and needs at substantial, and consumes energy huge, a large amount of energy for heating moisture during mud in heating high-pressure reactor, causes energy waste.Patent CN102139277A discloses a kind of low temperature for contaminated soil and resolves renovation technique, first contaminated soil is transported to workshop by this technique, then by carrying out repeatedly turning to soil, that pollutant in soil evaporates in gas phase, finally utilize vacuum blower that gas is evacuated to exhaust treatment system to process, finally realize the reparation of contaminated soil.This technique has low energy consumption, advantage simple to operate, but the scope of this PROCESS FOR TREATMENT pollutant is little, volatile component under being only limitted to normal temperature.
Summary of the invention
The object of the present invention is to provide a kind of simple, quick, feasible Organically-pollutedsoil soil remediation method, relatively ripe for current dusty gas treatment process, and the relatively incomplete present situation of fixed-end forces technology, the present invention makes full use of organic pollution and to be heated volatile feature, by taking certain strengthening means, first the organic pollution in soil is transferred in gas phase, and then gas is processed, realize the target of contaminated soil remediation.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of organic polluted soil is chemical enhanced
Restorative procedure, comprises (1) contaminated soil and concentrates storage and transport process; (2) chemical intensification treatment process; (3) contaminated off-gas processing procedure; (4) soil checks and accepts transport process four-stage.
Specifically, comprise the following steps:
(1) contaminated soil concentrates storage and transport process: temporary reservoir is carried out in the process workshop that contaminated soil is transported to sealing by contaminated site;
(2) chemical intensification treatment process: in the process workshop of sealing, quick lime is mixed in contaminated soil, turn over sieve apparatus by soil to carry out intermittence to the soil being mixed with quick lime and turn over sieve, utilize the reaction of moisture liberated heat in quick lime and contaminated soil, the organic pollution accelerated in contaminated soil evaporates in gas phase, carries out periodic detection to the soil after turning over sieve process;
(3) contaminated off-gas processing procedure: the gas pump drainage of the organic pollution volatilized from contaminated soil will be contained in workplace in step (2) to exhaust treatment system by vacuum drawing system, successively through bag-type dust and charcoal absorption, finally up to standardly enter in air;
(4) soil checks and accepts transport process: the soil after turning over sieve process to step (2) carries out periodic detection, soil carries out sampling analysis, reach and repair the soil of desired value and be backfilled to same court after completing a repairing efficiency, do not reach and repair desired value, continue to repeat step (2), until reach reparation desired value.
Described contaminated soil temporary reservoir and chemical intensification treatment process are carried out in the seal operation that is configured with blower system, vacuum drawing system and exhaust treatment system.
In described step (2), the overall ventilation frequency in the process workshop of sealing is 5 times/day.
In described step (2) and (4), the addition of quick lime is the 10%-15% of contaminated soil weight, contaminated soil to turn over sieve frequency be 5 hours/time, repairing efficiency is 8-10 days.
In described step (2), the periodic detection of soil is sieved number of times and conformed to turning over, after turning over sieve, sampling analysis is carried out to soil at every turn, determine the degree that pollution control is repaired.
The invention has the beneficial effects as follows: the invention provides the chemical enhanced reparation invention of a kind of organic polluted soil rapidly and efficiently, the mode that the present invention adopts chemistry to combine with physics, the organic pollution in soil is utilized to be heated volatile feature, the common volatilization promoting pollutant of sieve is turned over by utilizing chemical reaction liberated heat and machinery, and then utilize the pressure extracting of vacuum blower, make gas containing pollutant by bag-type dust and charcoal absorption process, make tail gas qualified discharge, finally realize the target of contaminated soil remediation.Engineering construction result shows, compares other restorative procedure, and the method just can reach the management goal of expection with relatively little equipment investment, have broad application prospects.
Accompanying drawing explanation
Fig. 1 is the chemical enhanced restorative procedure schematic diagram of organic polluted soil of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
As shown in Figure 1, the chemical enhanced restorative procedure of organic polluted soil of the present invention, comprises (1) contaminated soil and concentrates storage and transport process; (2) chemical intensification treatment process; (3) contaminated off-gas processing procedure; (4) soil checks and accepts transport process four-stage.
Specifically, comprise the following steps:
(1) contaminated soil concentrates storage and transport process: temporary reservoir is carried out in the process workshop that contaminated soil is transported to sealing by contaminated site;
(2) chemical intensification treatment process: in the process workshop of sealing, quick lime is mixed in contaminated soil, turn over sieve apparatus by soil to carry out intermittence to the soil being mixed with quick lime and turn over sieve, utilize the reaction of moisture liberated heat in quick lime and contaminated soil, the organic pollution accelerated in contaminated soil evaporates in gas phase, carries out periodic detection to the soil after turning over sieve process;
(3) contaminated off-gas processing procedure: the gas pump drainage of the organic pollution volatilized from contaminated soil will be contained in workplace in step (2) to exhaust treatment system by vacuum drawing system, successively through bag-type dust and charcoal absorption, finally up to standardly enter in air;
(4) soil checks and accepts transport process: the soil after turning over sieve process to step (2) carries out periodic detection, soil carries out sampling analysis, reach and repair the soil of desired value and be backfilled to same court after completing a repairing efficiency, do not reach and repair desired value, continue to repeat step (2), until reach reparation desired value.
Described contaminated soil temporary reservoir and chemical intensification treatment process are carried out in the seal operation that is configured with blower system, vacuum drawing system and exhaust treatment system.
In described step (2), the overall ventilation frequency in the process workshop of sealing is 5 times/day.
In described step (2) and (4), the addition of quick lime is the 10%-15% of contaminated soil weight, contaminated soil to turn over sieve frequency be 5 hours/time, repairing efficiency is 8-10 days.
In described step (2), the periodic detection of soil is sieved number of times and conformed to turning over, after turning over sieve, sampling analysis is carried out to soil at every turn, determine the degree that pollution control is repaired.
Concentrate the storage and transport process stage at contaminated soil, first according to recovery scenario, unwrapping wire is carried out to Polluted area, determines pollution range.Use ordinary excavator, as requested mechanical equivalent of light excavation is carried out to soil within the scope of unwrapping wire.After excavation completes, sampling analysis is carried out to the end, hole and sidewall, after determining that pollutant load repairs desired value lower than it, prove that contaminated soil has excavated.The period that temperature is lower, air humidity is comparatively large, wind-force is less should be selected, to reduce volatilization and airborne dust during earth excavation as far as possible.After excavation, in excavation face, spray organic pollution volatilization inhibitor or microbial activity bacterium liquid in time carry out volatilization and control.After sprinkling, lay plastic sheeting depending on smell situation and cover excavating region temporarily.By the soil after excavation, be loaded in special transportation vehicle, transport vehicle should cover in time after filling, and avoids trickling down on the way.
At chemical intensification treatment process stage, the assigned address that the contaminated soil of shipment is transported in airtight workplace by transport vehicle is stacked.Stack shape based on trapezoidal, be about 8-10m below, height is 2.5-3.0m about, and side slope angle is not less than 60 °, and longitudinal length adjusts according to the size of airtight workplace, earth volume about 2400 side of each processing unit.According to design proportion, spilling chemical enhanced medicament the soil surface paving of stacking---quick lime, paving is spilt and should be accomplished evenly, strictly to control flying dust as far as possible.Then utilize soil to turn over sieve apparatus and turn over sieve to contaminated soil, the disposal ability that every platform soil turns over sieve apparatus is about 100 cubes ms/h, to every batch of soil turn over sieve frequency be 5 hours/time, the cycle is 8-10 days.
Turning in sieved journey to contaminated soil, blower system, the vacuum drawing system of workplace keep work always, pass through gas exchanges, pollutant levels in workplace in air are in lower state, waste gas is purified by exhaust treatment system, and preventing pollution thing outwardly loss causes secondary pollution.
Carrying out in chemical intensification treatment process to contaminated soil, periodic detection need carried out to contaminated soil, detecting qualified carrying out transhipment backfill, detect underproof continuation process.Adopt organic gas PID detector to detect soil, concrete grammar is that a small amount of soil sample is placed in sealed sample bag, ensures, containing a certain amount of air in sample sack, to leave standstill 10 minutes.The probe of PID detector is thrust in bag, continuance test 3 minutes, after obtaining stable reading, record numerical value.When the reading of PID is lower than reparation desired value, takes soil sample, deliver to laboratory, utilize gas chromatograph to analyze it, determine the content of wherein pollutant.Generally, through about 8-10 days turn over sieve period treatment, contaminated soil can reach repairing effect.
In the contaminated off-gas processing procedure stage, the gas containing pollutant by vacuum blower pump drainage to exhaust treatment system, through bag-type dust and charcoal absorption process qualified discharge.A sidewall of airtight workplace arranges a bleeding point every 15m, and the process air quantity of main air blower is 60000m3/h, and the structures under wind load of workplace is not less than 120km/h, and anti-snow load is not less than 97.5kg/m2.When charcoal absorption is saturated, hot recycling is carried out to it.
Table 1 contaminated site situation list
| Pollutant | Content (mg/kg) | Repair desired value |
| Chloroform | 463.85 | 0.063 |
| 1,2-dichloroethanes | 163 | 0.19 |
| Benzene | 116 | 0.43 |
| Toluene | 1420 | 231 |
| Ethylbenzene | 634 | 37 |
Contaminated site area is about 5000m2, and mainly plain fill and silt press from both sides the contaminated soil layer construction in place from top to bottom
Silty clay, moisture content is about 20wt%, and the gentle vertical permeability coefficient of the soil water is about 10-4cm/s, and pollution depth is about 3.6m.After engineering starts, first contaminated soil is excavated by same court, be transported to workshop.Then in contaminated soil, mix quick lime in the ratio of 8wt%, utilize soil to turn over sieve apparatus and sieve is turned over to it.After 10 days, carry out sampling analysis to soil, the pollutant in result display soil is except a little higher than reparation desired value of ethyl-benzene level, and other each pollutant loads are all lower than reparation desired value.For ensureing repairing effect, project management department processes the sieve that turns over that this batch of soil carries out again 2 days, is detecting, and testing result display ethyl-benzene level is also lower than reparation desired value.In processing procedure, carried out sample testing to the gas of exhaust treatment system discharge, test result shows the detection limit of each pollutant load lower than instrument, proves the ability to work absolute confidence of exhaust treatment system.
In sum, content of the present invention is not limited in the above-described embodiment, and the knowledgeable people in same area can propose other embodiment easily within technological guidance's thought of the present invention, but this embodiment all comprises within the scope of the present invention.
Claims (6)
1. a method for renovation of organic pollution soil, is characterized in that, comprises (1) contaminated soil and concentrates storage and transport process; (2) chemical intensification treatment process; (3) contaminated off-gas processing procedure; (4) soil checks and accepts transport process four-stage.
2. the chemical enhanced restorative procedure of organic polluted soil according to claim 1, is characterized in that, comprise the following steps:
(1) contaminated soil concentrates storage and transport process: temporary reservoir is carried out in the process workshop that contaminated soil is transported to sealing by contaminated site;
(2) chemical intensification treatment process: in the process workshop of sealing, quick lime is mixed in contaminated soil, turn over sieve apparatus by soil to carry out intermittence to the soil being mixed with quick lime and turn over sieve, utilize the reaction of moisture liberated heat in quick lime and contaminated soil, the organic pollution accelerated in contaminated soil evaporates in gas phase, carries out periodic detection to the soil after turning over sieve process;
(3) contaminated off-gas processing procedure: the gas pump drainage of the organic pollution volatilized from contaminated soil will be contained in workplace in step (2) to exhaust treatment system by vacuum drawing system, successively through bag-type dust and charcoal absorption, finally up to standardly enter in air;
(4) soil checks and accepts transport process: the soil after turning over sieve process to step (2) carries out periodic detection, soil carries out sampling analysis, reach and repair the soil of desired value and be backfilled to same court after completing a repairing efficiency, do not reach and repair desired value, continue to repeat step (2), until reach reparation desired value.
3. the chemical enhanced restorative procedure of organic polluted soil according to claim 2, it is characterized in that, described contaminated soil temporary reservoir and chemical intensification treatment process are carried out in the seal operation that is configured with blower system, vacuum drawing system and exhaust treatment system.
4. the chemical enhanced restorative procedure of organic polluted soil according to claim 2, is characterized in that, in described step (2), the overall ventilation frequency in the process workshop of sealing is 5 times/day.
5. the chemical enhanced restorative procedure of organic polluted soil according to claim 2, it is characterized in that, in described step (2) and (4), the addition of quick lime is the 10%-15% of contaminated soil weight, contaminated soil to turn over sieve frequency be 5 hours/time, repairing efficiency is 8-10 days.
6. the chemical enhanced restorative procedure of the organic polluted soil according to claim 3 or 5, it is characterized in that, in described step (2), the periodic detection of soil is sieved number of times and conformed to turning over, after turning over sieve, sampling analysis is carried out to soil at every turn, determine the degree that pollution control is repaired.
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| CN201410409439.XA CN105457993A (en) | 2014-08-19 | 2014-08-19 | Method for restoring organically polluted soil |
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| CN201410409439.XA CN105457993A (en) | 2014-08-19 | 2014-08-19 | Method for restoring organically polluted soil |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107199238A (en) * | 2017-05-16 | 2017-09-26 | 程刚 | The elution module and its ELUTION METHOD of vehicle-mounted integrated form Soil leaching prosthetic device |
| CN107470342A (en) * | 2016-06-08 | 2017-12-15 | 上海康恒环境股份有限公司 | The construction method and constructing device of the volatile contaminated soil heterotopic low temperature thermal desorption of chlorobenzene class |
| CN107695093A (en) * | 2017-11-16 | 2018-02-16 | 天津市环境保护科学研究院 | Pretreatment unit and soil in-situ repair system |
| CN108906874A (en) * | 2018-06-26 | 2018-11-30 | 上海艾库环境工程有限公司 | A kind of organic material contaminated soil renovation technique |
| CN111085535A (en) * | 2019-12-31 | 2020-05-01 | 云南省环境科学研究院(中国昆明高原湖泊国际研究中心) | Method for determining addition amount of quicklime in organic contaminated soil treatment and treatment method of organic contaminated soil |
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2014
- 2014-08-19 CN CN201410409439.XA patent/CN105457993A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107470342A (en) * | 2016-06-08 | 2017-12-15 | 上海康恒环境股份有限公司 | The construction method and constructing device of the volatile contaminated soil heterotopic low temperature thermal desorption of chlorobenzene class |
| CN107199238A (en) * | 2017-05-16 | 2017-09-26 | 程刚 | The elution module and its ELUTION METHOD of vehicle-mounted integrated form Soil leaching prosthetic device |
| CN107695093A (en) * | 2017-11-16 | 2018-02-16 | 天津市环境保护科学研究院 | Pretreatment unit and soil in-situ repair system |
| CN108906874A (en) * | 2018-06-26 | 2018-11-30 | 上海艾库环境工程有限公司 | A kind of organic material contaminated soil renovation technique |
| CN111085535A (en) * | 2019-12-31 | 2020-05-01 | 云南省环境科学研究院(中国昆明高原湖泊国际研究中心) | Method for determining addition amount of quicklime in organic contaminated soil treatment and treatment method of organic contaminated soil |
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