CN103056157A - Repairing method and device for mercury-polluted soil by using low-temperature pyrolysis treatment - Google Patents
Repairing method and device for mercury-polluted soil by using low-temperature pyrolysis treatment Download PDFInfo
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- CN103056157A CN103056157A CN2013100291892A CN201310029189A CN103056157A CN 103056157 A CN103056157 A CN 103056157A CN 2013100291892 A CN2013100291892 A CN 2013100291892A CN 201310029189 A CN201310029189 A CN 201310029189A CN 103056157 A CN103056157 A CN 103056157A
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Abstract
The invention discloses a repairing method and device for mercury-polluted soil by using low-temperature pyrolysis treatment. The repairing method for the mercury-polluted soil comprises the following steps: crashing excavated mercury-polluted soil and drying the excavated mercury-polluted soil with air, wherein the soil moisture content is less than or equal to 10%; and secondly, putting the soil dried with the air into a pyrolysis device, wherein the original temperature of the pyrolysis device is 250 DEG C, heating within 30 minutes to be at a temperature within 400 DEG C, and condensing and recycling mercury steam evaporated in the soil through a gas recycling device. The invention provides the method and the device for properly repairing and recycling mercury. The method for repairing the mercury-polluted soil by using a low-temperature pyrolysis treatment repairing technology and separating pollutants from the soil by using a physical heating method is adopted, so that not only can the soil cultivation capability be kept, but also can realize the purpose of absolutely removing the mercury from the polluted soil. Clean soil and organic matters can be properly added in the treated soil, so that the agriculture production can be rapidly repaired, and the operation cost is low.
Description
Technical field
The present invention relates to environmental technology field, especially a kind of low temperature pyrogenation of mercury contaminated soil is processed restorative procedure and device.
Background technology
Mercury and mercuric compounds has very strong neurotoxicity and teratogenesis, and build-up effect and genetoxic are obvious, is the priority pollutants of very paying close attention to both at home and abroad always.China is had 3.2 * 10 by the cultivated area that Hg pollutes
4Hectare, annual " the mercury rice " that produces reaches 1.9 * 10
8Kg.In 50 to the eighties mid-term, Guizhou Province once was China and even important product mercury area in the world, produced the mercury amount and accounted for 70% of the whole nation, although since the nineties, production scale is atrophy gradually, but still is the important base that reclaims and produce the mercury goods.Long-term mercury exploitation and the smelting of China produced ecological environment on every side, especially agricultural land soil caused to have a strong impact on.
Mercury enters soil environment, by food chain human body is produced harm.According to the investigation to mercury ore district periphery, mercury content in some mercury ore Soil Surrounding or the dirty filling agricultural land soil is up to 500-700mg/Kg, even thousands of mg/Kg, mercury and methyl Hg content are respectively up to 569ng/g and 114ng/g in the rice of periphery farmland, human body methyl mercury every day cumulant average out to 0.82-2.97g, the Polluted area mercury content is significantly higher than the standard of the 0.47ug/Kg of WHO regulation, and the mercury exposure thresholds that more is higher than U.S. EPA regulation human body every day is 0.1ug/Kg.According to investigations, the incidences of disease such as mercury pollution area peripheral edge resident cancer and calculus are very high.Take the Guizhou wanshan mercury as example, from 1949 to after this half a century, waste residue and the mercurous waste gas of wanshan mercury discharging have caused pollution to its zone and the peripheral ecosystem, and the mine tailing of storing up and debris dump still continuing to discharge mercury to environment, become the secondary pollution source.Partial investigation's research finds that mercury and methyl mercury content obviously increase in the crop of the farmland production that mercury ore is contiguous, directly the residents ' health of locality has been caused serious threat.Investigation according to disease prevention and control center, Guizhou Province and Wanshan Special Region Disease Control and Prevention Center, the resident of wanshan mercury contaminated area urinates the mercury average content and exceeds standard 3.5 times, hair is mercurous on average to exceed standard 2.59 times, the ill incidence of disease of mercury poisoning reaches 4.3～5.8%, the mining area average life span only is 58.4 years old, mercury exposed population group average life span was 52.5 years old, well below the average life span level of the whole province 65.3 years old.Therefore, the processing of mercury contaminated soil and reparation utilize technical research extremely urgent.
The restorative procedure of contaminated soil is broadly divided into physical method, chemical method and biological method three major types from the principle of repairing.The pollution control technology such as the physics reparation refers to removing take physical means as main body, covers, dilution.Chemistry is repaired the technology refer to utilize the chemical reaction between external or soil self material to carry out pollution control.The biological prosthetic pollutant that refers to utilize in plant, animal and microorganism absorption, degraded, the conversion soil makes the concentration of pollutant drop to acceptable level or poisonous and hazardous pollutant is converted into harmless material.The contaminated soil reparation also can be divided into original position reparation and two kinds of modes of operation of showering, the former need not excavate and carry soil, can save processing cost, but it needs the long implementation cycle usually, and because soil and the water-bearing layer property of there are differences can not guarantee uniformity for the treatment of; The required repairing efficiency of the latter is relatively short, and can control better uniformity for the treatment of by means such as homogenize, screening, continuous stirring, but it need to excavate soil, and required expense is higher and need to increase job facilities.
The technical method that does not also have at present a maturation of processing and repairing for mercury contaminated soil both at home and abroad.
Summary of the invention
The objective of the invention is: provide a kind of low temperature pyrogenation of mercury contaminated soil to process restorative procedure and device, its energy consumption is low, and soil physico-chemical property and natural fertility are destroyed littlely after processing, so that soil backfill and recover agricultural production after processing, operating cost is low.
The present invention is achieved in that the low temperature pyrogenation processing restorative procedure of mercury contaminated soil, and it is air-dry to carry out fragmentation after mercury-contaminated soil is excavated, and makes soil moisture content not high by 10%; Then the soil after air-dry is dropped in the pyrolysis installation, the initial temperature of pyrolysis installation is 250 ℃, is heated in 30 minutes in 400 ℃, the mercuryvapour that is evaporated in the soil is carried out condensation through gas concentration unit reclaim.
Low temperature pyrogenation is processed the pyrolysis installation of restorative procedure, comprise feed arrangement, be connected with pyrolysis oven at feed arrangement, be connected with fuel supply device at pyrolysis oven, be provided with drawing mechanism at pyrolysis oven, be connected with condensate recycling device at the exhaust outlet at pyrolysis oven.
Feed arrangement is manual feed arrangement or automatic feeder.
Condensate recycling device comprises waste gas recovering device and mercury-containing waste water treating apparatus.
Mercury at normal temperatures fusing point is-38.87 ℃, and boiling point is 356.73 ℃, and heat of vaporization is 13.905kcal/mol, its volatility is larger, and evaporation rate raises with temperature and sharply increases, after mercury is subjected to thermal evaporation, mercuryvapour is heavier than air about 6 times, and density is 13.546g/cm in the time of 20 ℃
3, easily condense, easily and moisture from; After the mercury contaminated soil pyrolysis, residual mercury major part all is residual form in the soil; After adopting appropriate action, soil fertility can be improved to the state that is fit to arable farming fully.
Owing to adopted technique scheme, compared with prior art, the present invention has set up suitable reparation and has reclaimed the method and apparatus of mercury, adopt low temperature pyrogenation to process with recovery technique and repair mercury-contaminated soil, utilize the physical heating method so that the restorative procedure that pollutant is separated from soil, contaminated soil can reach the state that is fit to arable farming after treatment fully, because the temperature of whole processing procedure is no more than 400 ℃, therefore can keep soil property and gross, soil physico-chemical property and natural fertility are destroyed less after processing, the clearance of mercury reaches more than 96%, can keep under the soil cultivation ability condition, can realize again from contaminated soil purpose that mercury is thoroughly removed, soil adds cleaning soil and organic matter in right amount after processing, can return to fast agricultural production, operating cost is low.It is applicable to the present invention mercury content and is higher than more than the 100mg/kg, and soil is soft, particularly the high soil of the volatile mercury such as element mercury or methyl mercury compounds content.The present invention has promoted the control of heavy metal Hg pollutant, has significant social benefit, environmental benefit.The inventive method is simple, is easy to industrialization, and result of use is good.
Description of drawings
Accompanying drawing 1 is structural representation of the present invention.
The specific embodiment
Embodiments of the invention 1: the low temperature pyrogenation of mercury contaminated soil is processed restorative procedure, and mercury in soils content is 244.8mg/kg, and it is air-dry to carry out fragmentation after mercury-contaminated soil is excavated, and makes soil moisture content not high by 10%; Then the soil after air-dry is dropped in the pyrolysis installation, the initial temperature of pyrolysis installation is 250 ℃, is heated to 400 ℃ in 30 minutes, the mercuryvapour that is evaporated in the soil is carried out condensation through gas concentration unit reclaim; After testing, mercury content is lower than 7.5mg/kg in the soil after the processing, and the clearance of mercury reaches 96.94%.
In addition, pyrolysis time employing 30 minutes and 60 minutes final removal efficiency of mercuries are without significant difference, and the low temperature pyrogenation time is controlled at 30 minutes and can reaches remarkable result.
The result of the pyrolysis installation of low temperature pyrogenation processing restorative procedure comprises feed arrangement 1 as shown in Figure 1, and feed arrangement 1 is for automatically carrying out device; Be connected with pyrolysis oven 2 at feed arrangement 1, be connected with fuel supply device 5 at pyrolysis oven 2, be provided with drawing mechanism 3 at pyrolysis oven 2, be connected with condensate recycling device 4 at the exhaust outlet at pyrolysis oven 2; Condensate recycling device 4 comprises waste gas recovering device 6 and mercury-containing waste water treating apparatus 7.
Embodiments of the invention 2: the low temperature pyrogenation of mercury contaminated soil is processed restorative procedure, and mercury in soils content is 264.6mg/kg, and it is air-dry to carry out fragmentation after mercury-contaminated soil is excavated, and makes soil moisture content not high by 10%; Then the soil after air-dry is dropped in the pyrolysis installation, the initial temperature of pyrolysis installation is 250 ℃, is heated in 30 minutes in 330 ℃, the mercuryvapour that is evaporated in the soil is carried out condensation through gas concentration unit reclaim; After testing, mercury content is lower than 25.7mg/kg in the soil after the processing, and the clearance of mercury reaches 90.29%.
Make the moisture content of soil be lower than 10%, pyrolysis temperature is 310 ℃, and when pyrolysis time was 30min, the clearance of mercury in soils can reach more than 90%.
The device that adopts is with claim 1.
Embodiment is processed the soil (not mixing fresh soil) that obtains be used in the winter time the cultivation pakchoi, soil is moved in the flowerpot, add suitable quantity of water, sprinkle the pakchoi seed on the surface.Every group of two samples are under equal conditions cultivated in hot house.Three weeks of pakchoi seed successfully germinate.
In addition, the soil with fresh soil and embodiment acquisition is 1:1 by blending ratio; 2:1; 3:1 arranges experiment, and soil and fresh soil move in the flowerpot in proportion after will processing, and adds suitable quantity of water after fully mixing, and sprinkles the pakchoi seed on the surface.Every group of two samples are under equal conditions cultivated in hot house.The pakchoi seed successfully germinateed in two weeks.
Mercury-contaminated soil is described through after the pyrolysis, residual mercury major part all is residual form in the soil.After adopting appropriate action, soil fertility can be improved to the state that is fit to arable farming fully.
Claims (4)
1. the low temperature pyrogenation of a mercury contaminated soil is processed restorative procedure, it is characterized in that: it is air-dry to carry out fragmentation after mercury-contaminated soil is excavated, and makes soil moisture content not be higher than 10%; Then the soil after air-dry is dropped in the pyrolysis installation, the initial temperature of pyrolysis installation is 250 ℃, is heated in 30 minutes in 400 ℃, the mercuryvapour that is evaporated in the soil is carried out condensation through gas concentration unit reclaim.
2. the low temperature pyrogenation of an employing mercury contaminated soil claimed in claim 1 is processed the pyrolysis installation of restorative procedure, comprise feed arrangement (1), it is characterized in that: be connected with pyrolysis oven (2) at feed arrangement (1), be connected with fuel supply device (5) at pyrolysis oven (2), be provided with drawing mechanism (3) at pyrolysis oven (2), be connected with condensate recycling device (4) at the exhaust outlet of pyrolysis oven (2).
3. pyrolysis installation according to claim 2, it is characterized in that: feed arrangement (1) is manual feed arrangement or automatic feeder.
4. pyrolysis installation according to claim 2, it is characterized in that: condensate recycling device (4) comprises waste gas recovering device (6) and mercury-containing waste water treating apparatus (7).
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103658166A (en) * | 2013-12-26 | 2014-03-26 | 江苏盖亚环境工程有限公司 | Steam oven for remedying polluted soil |
| CN103785682A (en) * | 2014-03-05 | 2014-05-14 | 中国环境科学研究院 | Method of promoting heat treating remediation for soil polluted by mercury |
| CN104174635A (en) * | 2014-09-03 | 2014-12-03 | 广西博世科环保科技股份有限公司 | Method and equipment for processing mercury-containing waste residue |
| CN104289513A (en) * | 2014-10-14 | 2015-01-21 | 中节能大地环境修复有限公司 | Device and method applied to thermal desorption treatment of mercury-contaminated soil |
| CN105772498A (en) * | 2016-05-12 | 2016-07-20 | 贵州省环境科学研究设计院 | Soil mercury removal air inflow control system |
| CN106925605A (en) * | 2017-03-30 | 2017-07-07 | 上海申朗新能源科技发展股份有限公司 | A kind of mercury contaminated soil repair system |
| CN107398470A (en) * | 2017-08-24 | 2017-11-28 | 航天凯天环保科技股份有限公司 | A kind of method that mercury contaminated soil is repaired in low temperature thermal desorption amalgamation elution |
| CN107398472A (en) * | 2017-08-24 | 2017-11-28 | 航天凯天环保科技股份有限公司 | A kind of stable method for repairing mercury contaminated soil of low temperature thermal desorption amalgamation |
| CN107413823A (en) * | 2017-08-24 | 2017-12-01 | 航天凯天环保科技股份有限公司 | A kind of method that mercurous dangerous waste residue is administered in low temperature thermal desorption amalgamation elution |
| CN107497843A (en) * | 2017-09-21 | 2017-12-22 | 福建农林大学 | A kind of method that low temperature pyrogenation repairs mercury contaminated soil |
| CN107649483A (en) * | 2017-08-24 | 2018-02-02 | 航天凯天环保科技股份有限公司 | A kind of stable method for administering mercurous dangerous waste residue of low temperature thermal desorption amalgamation |
| CN108772414A (en) * | 2018-07-17 | 2018-11-09 | 贵州省环境科学研究设计院 | A kind of demercuration separator for modularization soil mercury removal device |
| CN109632453A (en) * | 2018-11-10 | 2019-04-16 | 钱巍 | A kind of thermal desorption method soil remediation experimental rig |
| CN110052487A (en) * | 2019-03-22 | 2019-07-26 | 中科京投环境科技江苏有限公司 | A kind of mercury contaminated soil prosthetic appliance |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103658166A (en) * | 2013-12-26 | 2014-03-26 | 江苏盖亚环境工程有限公司 | Steam oven for remedying polluted soil |
| CN103785682A (en) * | 2014-03-05 | 2014-05-14 | 中国环境科学研究院 | Method of promoting heat treating remediation for soil polluted by mercury |
| CN103785682B (en) * | 2014-03-05 | 2016-04-06 | 中国环境科学研究院 | A kind ofly promote the method that mercury contaminated soil heat treatment is repaired |
| CN104174635A (en) * | 2014-09-03 | 2014-12-03 | 广西博世科环保科技股份有限公司 | Method and equipment for processing mercury-containing waste residue |
| CN104174635B (en) * | 2014-09-03 | 2016-06-22 | 广西博世科环保科技股份有限公司 | The processing method of waste slag containing mercury and the equipment of process |
| CN104289513A (en) * | 2014-10-14 | 2015-01-21 | 中节能大地环境修复有限公司 | Device and method applied to thermal desorption treatment of mercury-contaminated soil |
| CN105772498A (en) * | 2016-05-12 | 2016-07-20 | 贵州省环境科学研究设计院 | Soil mercury removal air inflow control system |
| CN106925605A (en) * | 2017-03-30 | 2017-07-07 | 上海申朗新能源科技发展股份有限公司 | A kind of mercury contaminated soil repair system |
| CN107413823A (en) * | 2017-08-24 | 2017-12-01 | 航天凯天环保科技股份有限公司 | A kind of method that mercurous dangerous waste residue is administered in low temperature thermal desorption amalgamation elution |
| CN107398472A (en) * | 2017-08-24 | 2017-11-28 | 航天凯天环保科技股份有限公司 | A kind of stable method for repairing mercury contaminated soil of low temperature thermal desorption amalgamation |
| CN107398470A (en) * | 2017-08-24 | 2017-11-28 | 航天凯天环保科技股份有限公司 | A kind of method that mercury contaminated soil is repaired in low temperature thermal desorption amalgamation elution |
| CN107649483A (en) * | 2017-08-24 | 2018-02-02 | 航天凯天环保科技股份有限公司 | A kind of stable method for administering mercurous dangerous waste residue of low temperature thermal desorption amalgamation |
| CN107649483B (en) * | 2017-08-24 | 2019-11-29 | 航天凯天环保科技股份有限公司 | A kind of method that low temperature thermal desorption amalgamation stablizes the mercurous dangerous waste residue of improvement |
| CN107398472B (en) * | 2017-08-24 | 2019-11-29 | 航天凯天环保科技股份有限公司 | A kind of method that low temperature thermal desorption amalgamation stablizes reparation mercury contaminated soil |
| CN107413823B (en) * | 2017-08-24 | 2020-10-02 | 航天凯天环保科技股份有限公司 | Method for treating mercury-containing dangerous waste residues by combining low-temperature thermal desorption with chemical leaching |
| CN107497843A (en) * | 2017-09-21 | 2017-12-22 | 福建农林大学 | A kind of method that low temperature pyrogenation repairs mercury contaminated soil |
| CN108772414A (en) * | 2018-07-17 | 2018-11-09 | 贵州省环境科学研究设计院 | A kind of demercuration separator for modularization soil mercury removal device |
| CN108772414B (en) * | 2018-07-17 | 2024-03-26 | 贵州省环境科学研究设计院 | Mercury removal and separation device for modularized soil mercury removal device |
| CN109632453A (en) * | 2018-11-10 | 2019-04-16 | 钱巍 | A kind of thermal desorption method soil remediation experimental rig |
| CN110052487A (en) * | 2019-03-22 | 2019-07-26 | 中科京投环境科技江苏有限公司 | A kind of mercury contaminated soil prosthetic appliance |
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Application publication date: 20130424 |