CN105032918A - Restorative method for soil polluted by cyanide - Google Patents
Restorative method for soil polluted by cyanide Download PDFInfo
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- CN105032918A CN105032918A CN201510330849.XA CN201510330849A CN105032918A CN 105032918 A CN105032918 A CN 105032918A CN 201510330849 A CN201510330849 A CN 201510330849A CN 105032918 A CN105032918 A CN 105032918A
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Abstract
The invention discloses a restorative method for soil polluted by cyanide. According to the characteristics that the soil polluted by cyanide comprises the cyanide, heavy metal and various pollutants and particularly according to the characteristic that the cyanide further comprises metal cyanide complex, such as iron cyanide complex, difficult to treat, firstly, ferrous sulfate and zinc sulfate are selected to fix the iron cyanide complex and various kinds of metal in the soil, and then the cyanide difficult to treat, sulfocyanide and other pollutants remaining in the soil are treated through ozone. The cyanide and various kinds of metal in the treated soil meet the national soil environment quality evaluation requirement.
Description
Technical field
The present invention relates to field of Environment Protection pollutant processing method, particularly a kind of restorative procedure of cyanide polluted soil.
Background technology
Because cyanogen root has good surface-active, activity function and complexing power, extensive in sector applications such as gold, plating, organic chemical industries in recent years, the problem of therefore soil cyanide pollution is also day by day serious.The natural degradation speed of cyanide in soil is much more slowly than its degradation speed in natural water, and under certain condition can be highly enriched in soil, all has long-term potential danger to plant growth, surface water, underground water.The recovery technique of the domestic and international soil to cyanide pollution is based on plant method and microbial method at present, but by the condition of plant growth and the cycle long, and the restriction of microorganism condition of culture, is difficult to meet requirement Industrial Wasteland being carried out to improvement fast.Therefore, people are in the urgent need to repairing the soil of cyanide pollution.
Summary of the invention
The object of the invention is the deficiency existed for existing soil cyanide pollution treatment technique, a kind of restorative procedure of cyanide polluted soil is provided.The present invention is according to the feature containing the multiple pollutant such as cyanide, heavy metal in the soil of cyanide pollution, particularly also comprise unmanageable metal top cradle in cyanide, as iron cyano complex etc., first select iron cyano complex and each heavy metal species in ferrous sulfate, zinc sulfate fixing soil, then with the pollutant such as difficult cyanide, rhodanate residual in ozone treatment soil.
The present invention includes following steps:
(1) under agitation, will by the soil of cyanide pollution through pulverizing and after removal of impurities process, being mixed with the mud that mass percent concentration is 30% ~ 40%, and to control its pH with milk of lime, ferrous sulfate be 8 ~ 9, the reaction time is 10min;
(2) reacted mud adds zinc sulfate under stirring, and is 8 ~ 9 by the pH value that ferrous sulfate controls in course of reaction, and the reaction time is 30min ~ 60min;
(3) reacted mud is under stirring, passes into ozone and carries out ozone oxidation reaction, and the pH value controlling course of reaction with soda acid medicament is 8 ~ 9, and the reaction time is 15min ~ 60min;
(4) mud after process carries out press filtration, and filtrate returns treatment process and continues to size mixing, and in soil, cyanide and all kinds of heavy metal reach national soil environment quality assessment requirement.
In described step (1), stirring linear velocity is 0.01m/s ~ 10m/s, and the consumption of milk of lime, ferrous sulfate is determined according to the pH of mud solution, and the reaction time is 10min;
In described step (2), stirring linear velocity is 0.01m/s ~ 10m/s, and the consumption of zinc sulfate is determined according to the content of the iron cyanide, ferrocyanide in mud solution, and the content of the iron cyanide, ferrocyanide is higher, and the dosage of zinc sulfate is larger;
In described step (3), ozone intake is determined according to the number of the remaining cyanide content in mud and processing requirements, cyanide content is high, process index request is tight, the intake of ozone is corresponding to be increased, otherwise cyanide content is low, process index request pine, the corresponding minimizing of intake of ozone, acid treatment is sulfuric acid, and alkali medicament is milk of lime.
Beneficial effect of the present invention:
The present invention is directed to the recovery technique of the domestic and international soil to cyanide pollution at present based on plant method and microbial method, but by condition, the cycle of plant growth, and the restriction of microorganism condition of culture, be difficult to meet and carry out administering the problem required fast, the restorative procedure of a kind of cyanide polluted soil provided to Industrial Wasteland.The present invention is according to the feature containing the multiple pollutant such as cyanide, heavy metal in the soil of cyanide pollution, particularly also comprise unmanageable metal top cradle in cyanide, as iron cyano complex etc., first select iron cyano complex and each heavy metal species in ferrous sulfate, zinc sulfate fixing soil, then with the pollutant such as difficult cyanide, rhodanate residual in ozone treatment soil.In soil after process, cyanide and all kinds of heavy metal reach national soil environment quality assessment requirement, have broad application prospects.
Detailed description of the invention
The present invention includes following steps:
(1) under agitation, will by the soil of cyanide pollution through pulverizing and after removal of impurities process, being mixed with the mud that mass percent concentration is 30% ~ 40%, and to control its pH with milk of lime, ferrous sulfate be 8 ~ 9, the reaction time is 10min;
(2) reacted mud adds zinc sulfate under stirring, and is 8 ~ 9 by the pH value that ferrous sulfate controls in course of reaction, and the reaction time is 30min ~ 60min;
(3) reacted mud is under stirring, passes into ozone and carries out ozone oxidation reaction, and the pH value controlling course of reaction with soda acid medicament is 8 ~ 9, and the reaction time is 15min ~ 60min;
(4) mud after process carries out press filtration, and filtrate returns treatment process and continues to size mixing, and in soil, cyanide and all kinds of heavy metal reach national soil environment quality assessment requirement.
In described step (1), stirring linear velocity is 0.01m/s ~ 10m/s, and the consumption of milk of lime, ferrous sulfate is determined according to the pH of mud solution, and the reaction time is 10min;
In described step (2), stirring linear velocity is 0.01m/s ~ 10m/s, and the consumption of zinc sulfate is determined according to the content of the iron cyanide, ferrocyanide in mud solution, and the content of the iron cyanide, ferrocyanide is higher, and the dosage of zinc sulfate is larger;
In described step (3), ozone intake is determined according to the number of the remaining cyanide content in mud and processing requirements, cyanide content is high, process index request is tight, the intake of ozone is corresponding to be increased, otherwise cyanide content is low, process index request pine, the corresponding minimizing of intake of ozone, acid treatment is sulfuric acid, and alkali medicament is milk of lime.
Instantiation 1:
Gather the contaminated soil of certain gold mine periphery, depth selection is 0 ~ 100cm, and the soil mixing that collection comes, remove impurity, pulverize, be divided into two parts by quartering, portion is analyzed cyanide, each heavy metal in soil.The assay method of cyanide content is with reference to exhibition land used evaluation criteria of soil environment quality (provisional).Measurement result cyanide content is 330.23mg/kg (in exhibition land used evaluation criteria of soil environment quality, the B level of cyanide is restricted to 8mg/kg).Take 300g soil in tank diameter, and size mixing with water and be mixed with the mud that concentration is 30%, mud pH is 8.81, without the need to regulating pH at interpolation medicament, stirs 10min; Then in mud, add zinc sulfate 3g stir 30min; Then pump slurry into peristaltic pump in the reactor of ozonation aerated device, ozonation aerated device adopts titanium alloy micro-hole aerator, and be placed in the bottom in reactor, pass into ozone reaction 30min, ozone intake is 100mg.The water outlet of mud after system process through assay pH between 8 ~ 9, CN
t< 0.1mg/L, SCN
-< 0.5mg/L, Cu
2+< 0.5mg/L, COD < 20mg/L, after process, water quality can reach reuse standard.In soil, cyanide and all kinds of heavy metal reach national soil environment quality assessment requirement after measured.
Instantiation 2:
Gather the contaminated soil of certain gold mine tailing storehouse periphery, depth selection is 0 ~ 100cm, and the soil mixing that collection comes, remove impurity, pulverize, be divided into two parts by quartering, portion is analyzed cyanide, each heavy metal in soil.The assay method of cyanide content is with reference to exhibition land used evaluation criteria of soil environment quality (provisional).Measurement result cyanide content is 830.23mg/kg (in exhibition land used evaluation criteria of soil environment quality, the B level of cyanide is restricted to 8mg/kg).Take 300g soil in tank diameter, and size mixing with water and be mixed with the mud that concentration is 30%, mud pH is 11.81, adds ferrous sulfate 5g and regulates mud pH to 8.5, stir 10min; Then in mud, add zinc sulfate 5g stir 30min; Then pump slurry into peristaltic pump in the reactor of ozonation aerated device, ozonation aerated device adopts titanium alloy micro-hole aerator, and be placed in the bottom in reactor, pass into ozone reaction 30min, ozone intake is 150mg.The water outlet of mud after system process through assay pH between 8 ~ 9, CN
t< 0.1mg/L, SCN
-< 0.5mg/L, Cu
2+< 0.5mg/L, COD < 20mg/L, after process, water quality can reach reuse standard.In soil, cyanide and all kinds of heavy metal reach national soil environment quality assessment requirement after measured.
Claims (4)
1. a restorative procedure for cyanide polluted soil, the method comprises the following steps:
(1), under agitation, will by the soil of cyanide pollution through pulverizing and after removal of impurities process, being mixed with the mud that mass percent concentration is 30% ~ 40%, and to control its pH with milk of lime, ferrous sulfate be 8 ~ 9, the reaction time is 10min;
(2), reacted mud adds zinc sulfate under stirring, and is 8 ~ 9 by the pH value that ferrous sulfate controls in course of reaction, and the reaction time is 30min ~ 60min;
(3), reacted mud under stirring, pass into ozone and carry out ozone oxidation reaction, controlling the pH value of course of reaction with soda acid medicament is 8 ~ 9, and the reaction time is 15min ~ 60min;
(4), process after mud carry out press filtration, filtrate returns treatment process and continues to size mixing, and in soil, cyanide and all kinds of heavy metal reach national soil environment quality assessment requirement.
2. the restorative procedure of a kind of cyanide polluted soil according to claim 1, is characterized in that: in described step (1), and stirring linear velocity is 0.01m/s ~ 10m/s.
3. the restorative procedure of a kind of cyanide polluted soil according to claim 1, is characterized in that: in described step (2), and stirring linear velocity is 0.01m/s ~ 10m/s.
4. the restorative procedure of a kind of cyanide polluted soil according to claim 1, is characterized in that: in described step (3), and acid treatment is sulfuric acid, and alkali medicament is milk of lime.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105414162A (en) * | 2015-11-18 | 2016-03-23 | 中科鼎实环境工程有限公司 | Method for repairing cyanide-polluted soil by physical heat analysis technology |
| CN107138519A (en) * | 2017-07-06 | 2017-09-08 | 爱土工程环境科技有限公司 | A kind of cyanide polluted soil dystopy chemical oxidation restorative procedure |
| CN107971335A (en) * | 2017-11-28 | 2018-05-01 | 长春黄金研究院 | A kind of method of gold industry cyanogen slag phytoremediation |
| CN109201726A (en) * | 2018-08-28 | 2019-01-15 | 中石化（洛阳）科技有限公司 | A kind of restorative procedure of cyanide polluted soil |
| CN110423622A (en) * | 2019-08-08 | 2019-11-08 | 北京润鸣环境科技有限公司 | A kind of low sulfur type chromium-polluted soil renovation agent and preparation method thereof and application method |
| CN110732549A (en) * | 2019-10-23 | 2020-01-31 | 深圳研源环境科技有限公司 | Heavy metal and pesticide composite polluted soil treatment process |
| CN113834720A (en) * | 2021-09-28 | 2021-12-24 | 四川省天晟源环保股份有限公司 | Soil cyanide and total cyanide preservative and in-situ preservation method |
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| CN103086548A (en) * | 2013-03-01 | 2013-05-08 | 长春黄金研究院 | Harmless comprehensive treatment method for cyanide-containing tailing pulp |
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| US6551514B1 (en) * | 1999-10-27 | 2003-04-22 | The Board Of Regents Of The University And Community College System Of Nevada | Cyanide detoxification process |
| CN101417287A (en) * | 2008-12-05 | 2009-04-29 | 中山大学 | Chemical repair method for cyanide polluted soil |
| CN103086548A (en) * | 2013-03-01 | 2013-05-08 | 长春黄金研究院 | Harmless comprehensive treatment method for cyanide-containing tailing pulp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105414162A (en) * | 2015-11-18 | 2016-03-23 | 中科鼎实环境工程有限公司 | Method for repairing cyanide-polluted soil by physical heat analysis technology |
| CN107138519A (en) * | 2017-07-06 | 2017-09-08 | 爱土工程环境科技有限公司 | A kind of cyanide polluted soil dystopy chemical oxidation restorative procedure |
| CN107138519B (en) * | 2017-07-06 | 2021-08-27 | 爱土工程环境科技有限公司 | Ectopic chemical oxidation remediation method for soil polluted by cyanide |
| CN107971335A (en) * | 2017-11-28 | 2018-05-01 | 长春黄金研究院 | A kind of method of gold industry cyanogen slag phytoremediation |
| CN109201726A (en) * | 2018-08-28 | 2019-01-15 | 中石化（洛阳）科技有限公司 | A kind of restorative procedure of cyanide polluted soil |
| CN110423622A (en) * | 2019-08-08 | 2019-11-08 | 北京润鸣环境科技有限公司 | A kind of low sulfur type chromium-polluted soil renovation agent and preparation method thereof and application method |
| CN110423622B (en) * | 2019-08-08 | 2021-06-25 | 北京润鸣环境科技有限公司 | Low-sulfur chromium-polluted soil remediation agent and preparation method and use method thereof |
| CN110732549A (en) * | 2019-10-23 | 2020-01-31 | 深圳研源环境科技有限公司 | Heavy metal and pesticide composite polluted soil treatment process |
| CN110732549B (en) * | 2019-10-23 | 2022-06-28 | 深圳研源环境科技有限公司 | Heavy metal and pesticide composite polluted soil treatment process |
| CN113834720A (en) * | 2021-09-28 | 2021-12-24 | 四川省天晟源环保股份有限公司 | Soil cyanide and total cyanide preservative and in-situ preservation method |
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| CN105032918B (en) | 2017-05-03 |
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