CN103897706A - Cadmium-polluted soil restoration eluting agent and cadmium-polluted soil eluting purifying method - Google Patents
Cadmium-polluted soil restoration eluting agent and cadmium-polluted soil eluting purifying method Download PDFInfo
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- CN103897706A CN103897706A CN201210580063.XA CN201210580063A CN103897706A CN 103897706 A CN103897706 A CN 103897706A CN 201210580063 A CN201210580063 A CN 201210580063A CN 103897706 A CN103897706 A CN 103897706A
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Abstract
The invention discloses a cadmium-polluted soil restoration eluting agent and a cadmium-polluted soil eluting purifying method, and belongs to the technical field of polluted soil purification. The cadmium-polluted soil restoration eluting agent comprises the following components: 50%-60% parts by volume of hydrochloric acid with the concentration of 0.5mol/L, 20%-30% parts by volume of sodium dodecyl benzene sulfonate with the concentration of 0.5mol/L and 10%-30% parts by volume of cyclodextrin with the concentration of 0.2mol/L. The cadmium-polluted soil eluting purifying treatment is performed by use of the cadmium-polluted soil restoration eluting agent for multiple steps, the volume ratio of soil to eluenting agent is 1:20, and the eluenting reaction time is 24 hours washing. The cadmium-polluted soil restoration eluting agent and the cadmium-polluted soil eluting purifying method can effectively remove cadmium in the cadmium-polluted soil, and the heavy metal cadmium removal rate reaches 98.9%.
Description
Technical field
The present invention relates to contaminated soil purification treatment technology field, relate in particular to a kind of eluent of cadmium pollution soil repair and use this eluent to carry out the method for drip washing purification to being subject to cadmium pollution soil.
Background technology
At present, China ploughs and is subject to the problem of the heavy metal contaminations such as cadmium, arsenic, lead day by day serious, and the financial loss causing is thus also increasing, it is reported at least 200 hundred million yuans of the financial losses that annual China causes because of heavy metal contamination.In all heavy metal contamination, the most serious with cadmium pollution.Along with industrial expansions such as mining, metallurgy and cadmium processing, China's agricultural soil is subject to cadmium pollution also day by day serious in recent years.Because cadmium can not be degraded by Soil Microorganism, the transformation period exceedes 20 years, and it pollutes for irreversible cumulative process; Meanwhile, cadmium is again the very strong heavy metal of biogenic migration, is very easily absorbed by plants and accumulates, and exceedes certain limit and not only have a strong impact on the yield and quality of crop, and edible portion very easily by food chain at people's cylinder accumulation and be detrimental to health.The toxicity of compound of cadmium is large, and belongs to savings, causes that can reach 10 to 30 years the latent period of chronic poisoning.In succession there is cadmium poisoning, cadmium pollution event in the ground such as Sui Chang county, Zhejiang, Wenzhou Area and river, Longjiang, Guangxi.Heavy metal in soil cadmium pollution has had a strong impact on Sustainable development and the human health of agriculture production, therefore, fully realizes the harm of cadmium to ecotope, carries out cadmium pollution improvement and is significant.
Now, there are a variety of purification repair process methods of carrying out cadmium pollution soil, comprise plant absorption process, chemical reaction method etc.These existing methods have the place of a lot of deficiencies for the reparation of cadmium pollution soil, comprise that repairing effect is not very desirable etc., and preparation and seeking of restorative procedure that the soil of cadmium pollution is carried out effectively repairing are environmentalist's unremitting pursue always.
Summary of the invention
In order to solve above-mentioned various technical problem, the object of this invention is to provide a kind of eluent of effective cadmium pollution soil repair and use this eluent to carry out the method for drip washing purification to being subject to cadmium pollution soil.
The object of the invention is to be achieved through the following technical solutions:
An eluent for cadmium pollution soil repair, comprises following component: hydrochloric acid 50%-60% capacity part that concentration is 0.5mol/L, Sodium dodecylbenzene sulfonate 20%-30% capacity part that concentration is 0.5mol/L, the cyclodextrin 10%-30% that concentration is 0.2mol/L.Above-mentioned three kinds of components are mixed the eluent of composition cadmium pollution soil repair.
Use an above-mentioned eluent, cadmium pollution soil is carried out to the method for drip washing processing, wherein, the volume ratio of soil and eluent solution is 1: 20, and the reaction times of drip washing is 24 hours.The drip washing purifying method of above-mentioned cadmium pollution soil, preferably the number of times of drip washing processing is 2 times.
The drip washing purifying method of cadmium pollution soil, specifically comprises the steps:
Step 1, is transported to drip washing place by cadmium pollution soil, tentatively sieves and remove the soil particle that granularity is greater than 5 millimeters in drip washing place, measures quantitatively after soil is mixed.Metering quantitatively adopts belt electronic measurement quantitative, and metering is quantitatively in order to add eluent and water extraction for basis and accurate data, in order more effectively to remove cadmium processing.
Step 2, is transported to quantitative uniform soil in mixing tank by the first e Foerderanlage, supplies water in mixing tank simultaneously.The first e Foerderanlage is feeding screw, supplies water to mixing tank by fresh water pump.
Step 3, carries out wet sieving processing by slurry transportation in mixing tank to wet type linear vibrating screen by the second e Foerderanlage, and linear vibrating screen is constantly sprayed water and assisted screening in screening process.Wherein, wet type linear vibrating screen sieve aperture is 70-130 order.
Step 4, on the sieve of wet sieving processing, mud directly enters wash trough, and the lower mud of sieve enters Buffer Pool.
Step 5, squeezes into hydrocyclone by the mud in Buffer Pool and carries out size fraction, and hydrocyclone underflow is input to wash trough, and hydrocyclone overflow inputs to inclined tube concentration basin.
Step 6, now, the solid materials comprising in wash trough is translational vibration on-the-sieve material and hydrocyclone underflow mud, in wash trough, add the eluent of cadmium pollution soil repair of the present invention, soil and the eluent solution volume ratio of 1: 20 carry out proportioning, fully friction washing under the effect of whipping device.Whipping device can be selected common stirrer.
Step 7, the slurries after washing are transported to inclined tube concentration basin and are condensed into after certain density mud, are fed through the first plate and frame(type)filter press, and filter-press dehydration obtains clean coarse grain footpath mud cake.The particle diameter 5-10mm in coarse grain footpath.
Step 8, detects the concentration of cadmium, can be used for backfill after reaching the standard of setting.Cadmium concentration limit standard is 0.3-0.5mg/kg.
Step 9, enters filter-press dehydration and ring waste in sewage treatment equipment, adopts reduction method or absorption method to remove the cadmium in waste water.
Step 10, by the waste water input inclined tube-type settling tank of processing in sewage treatment equipment, precipitating sludge is processed as Hazardous wastes after adopting the second plate-and-frame filter press briquetting, sends water tank back to so that recycle for water after treatment.
The eluent of a kind of cadmium pollution soil repair by the invention described above and the method that uses above-mentioned eluent cadmium pollution soil to be carried out to drip washing processing, effectively remove by the cadmium in cadmium pollution soil, makes the clearance of heavy metal cadmium reach 98.9%.
In order effectively to verify the effect of technical scheme of the present invention, carry out corresponding experiment:
Example one:
In 2012 take Suzhou City of Jiangsu Province bed mud Cadmium Pollution in Soils soil as sample, soil is strong basicity, and pH value is more than 11, organic content is not high, and below 3%, quality is thicker, 70% is grit, and in table 1, this table 1 has been listed the essential property for test soil.Cadmium Pollution in Soils is comparatively serious, and cadmium content reaches 8493mg/kg.Therefore the pollution level of cadmium is high and harm is serious.
Table 1
Example area is 30 square metres, repeats for three times, chooses at random, and control group and experimental group are set.Take eluent of the present invention and drip washing purifying treatment method to carry out cadmium pollution soil reparation, twice of drip washing, each reaction times is 24h, afterwards bed mud soil is carried out to cadmium content mensuration, result shows: be 93.42mg/kg through the Cadmium in Soil content of eluent drip washing, cadmium (Cd) clearance reaches 98.9%, and repairing effect is remarkable.Meanwhile, the eluent of cadmium pollution soil repair of the present invention and drip washing purifying treatment method can use on a large scale in cadmium pollution soil repair engineering.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Accompanying drawing explanation
Fig. 1 is the schematic process flow diagram of the drip washing purifying method of cadmium pollution soil repair of the present invention.
Claims (5)
1. the eluent of a cadmium pollution soil repair, it is characterized in that, comprise following component: hydrochloric acid 50%-60% capacity part that concentration is 0.5mol/L, Sodium dodecylbenzene sulfonate 20%-30% capacity part that concentration is 0.5mol/L, the cyclodextrin 10%-30% that concentration is 0.2mol/L.
2. a drip washing purifying method for cadmium pollution soil, is characterized in that, comprises the steps:
Right to use requires the eluent described in 1, and cadmium pollution soil is carried out to drip washing processing, and wherein, the volume ratio of soil and eluent is 1: 20, and the reaction times of drip washing is 24 hours.
3. the drip washing purifying method of cadmium pollution soil according to claim 2, is characterized in that, the number of times of drip washing processing is 2 times.
4. the drip washing purifying method of cadmium pollution soil according to claim 2, is characterized in that, comprises the steps:
Step 1, is transported to drip washing place by cadmium pollution soil, tentatively sieves and remove the soil particle that granularity is greater than 5 millimeters in drip washing place, measures quantitatively after soil is mixed;
Step 2, is transported to quantitative uniform soil in mixing tank by the first e Foerderanlage, supplies water in mixing tank simultaneously;
Step 3, carries out wet sieving processing by slurry transportation in mixing tank to wet type linear vibrating screen by the second e Foerderanlage, and linear vibrating screen is constantly assisted screening along journey water spray in screening process, and the sieve aperture of described wet type linear vibrating screen is 70-130 order;
Step 4, on the sieve of wet sieving processing, mud directly enters wash trough, and the lower mud of sieve enters Buffer Pool;
Step 5, squeezes into hydrocyclone by the mud in Buffer Pool and carries out size fraction, and hydrocyclone underflow is input to wash trough, and hydrocyclone overflow inputs to inclined tube concentration basin;
Step 6 adds the eluent of cadmium pollution soil repair claimed in claim 1 in wash trough, fully friction washing under the effect of whipping device;
Step 7, the slurries after washing are transported to inclined tube concentration basin and are condensed into after certain density mud, are fed through the first plate and frame(type)filter press, and filter-press dehydration obtains clean coarse grain footpath mud cake;
Step 8, detects the concentration of sexavalence cadmium, can be used for backfill after reaching the standard of setting;
Step 9, enters filter-press dehydration and ring waste in sewage treatment equipment, adopts reduction method or absorption method to remove the cadmium in waste water;
Step 10, by the waste water input inclined tube-type settling tank of processing in sewage treatment equipment, precipitating sludge is processed as Hazardous wastes after adopting the second plate-and-frame filter press briquetting, sends water tank back to so that recycle for water after treatment.
5. the drip washing purifying method of cadmium pollution soil according to claim 4, is characterized in that, step 6 is carried out twice.
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| CN201210580063.XA CN103897706A (en) | 2012-12-28 | 2012-12-28 | Cadmium-polluted soil restoration eluting agent and cadmium-polluted soil eluting purifying method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104140822A (en) * | 2013-05-09 | 2014-11-12 | 苏州中科慧盛生物科技有限公司 | Cadmium polluted soil restoration eluant and soil eluting purifying method |
| CN104226680A (en) * | 2014-10-09 | 2014-12-24 | 常州大学 | Repairing device and method for cadmium-contaminated soils |
| CN105750316A (en) * | 2015-11-24 | 2016-07-13 | 北京建工环境修复股份有限公司 | Method for washing and remedying soil at different positions in engineering multi-level sieving manner |
| CN107365585A (en) * | 2016-05-12 | 2017-11-21 | 南京凯杰环境技术有限公司 | A kind of environmentally friendly cadmium metal contaminated soil eluent and preparation method thereof |
| CN107457252A (en) * | 2017-08-04 | 2017-12-12 | 蓝畅 | One heavy metal species and（Or）The restorative procedure of organic hydrocarbon contaminated soil |
| CN108002499A (en) * | 2017-11-24 | 2018-05-08 | 中国石油大学(华东) | One kind removes heavy metal treatment agent and preparation method thereof in iron removaling system heavy-metal contaminated soil ring waste |
| CN108672483A (en) * | 2018-04-23 | 2018-10-19 | 天津大学 | The integrated restorative procedure of fluid conveying reaction and system of organo-mineral complexing contaminated soil |
| CN109877147A (en) * | 2019-04-10 | 2019-06-14 | 江南大学 | A kind of method of leaching and repairing cadmium polluted soil |
| CN111250535A (en) * | 2020-02-18 | 2020-06-09 | 四川省蜀通岩土工程公司 | Heavy metal composite contaminated site soil remediation method |
-
2012
- 2012-12-28 CN CN201210580063.XA patent/CN103897706A/en active Pending
Non-Patent Citations (1)
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| 易龙生等: "《重金属污染土壤修复淋洗剂研究进展》", 《安全与环境学报》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104140822A (en) * | 2013-05-09 | 2014-11-12 | 苏州中科慧盛生物科技有限公司 | Cadmium polluted soil restoration eluant and soil eluting purifying method |
| CN104226680A (en) * | 2014-10-09 | 2014-12-24 | 常州大学 | Repairing device and method for cadmium-contaminated soils |
| CN104226680B (en) * | 2014-10-09 | 2016-04-13 | 常州大学 | A kind of prosthetic device of cadmium pollution soil and method |
| CN105750316A (en) * | 2015-11-24 | 2016-07-13 | 北京建工环境修复股份有限公司 | Method for washing and remedying soil at different positions in engineering multi-level sieving manner |
| CN107365585A (en) * | 2016-05-12 | 2017-11-21 | 南京凯杰环境技术有限公司 | A kind of environmentally friendly cadmium metal contaminated soil eluent and preparation method thereof |
| CN107457252A (en) * | 2017-08-04 | 2017-12-12 | 蓝畅 | One heavy metal species and（Or）The restorative procedure of organic hydrocarbon contaminated soil |
| CN108002499A (en) * | 2017-11-24 | 2018-05-08 | 中国石油大学(华东) | One kind removes heavy metal treatment agent and preparation method thereof in iron removaling system heavy-metal contaminated soil ring waste |
| CN108672483A (en) * | 2018-04-23 | 2018-10-19 | 天津大学 | The integrated restorative procedure of fluid conveying reaction and system of organo-mineral complexing contaminated soil |
| CN109877147A (en) * | 2019-04-10 | 2019-06-14 | 江南大学 | A kind of method of leaching and repairing cadmium polluted soil |
| CN111250535A (en) * | 2020-02-18 | 2020-06-09 | 四川省蜀通岩土工程公司 | Heavy metal composite contaminated site soil remediation method |
| CN111250535B (en) * | 2020-02-18 | 2021-10-26 | 四川省冶勘设计集团有限公司 | Heavy metal composite contaminated site soil remediation method |
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Application publication date: 20140702 |