CN105238409A - Linkage stabilizing agent for repairing heavy metal contaminated soil and repairing method - Google Patents
Linkage stabilizing agent for repairing heavy metal contaminated soil and repairing method Download PDFInfo
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- CN105238409A CN105238409A CN201510739620.1A CN201510739620A CN105238409A CN 105238409 A CN105238409 A CN 105238409A CN 201510739620 A CN201510739620 A CN 201510739620A CN 105238409 A CN105238409 A CN 105238409A
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Abstract
The invention discloses a linked stabilizing agent for repairing heavy metal contaminated soil and a repairing method thereof. The linkage stabilizing agent comprises: a first agent comprising ferrous sulfate and montmorillonite, and a second agent comprising sulfide, calcium hydroxide, calcium oxide and silicon dioxide. The repairing method comprises the following steps of: (1) adding the first agent to the heavy metal contaminated soil, and stirring the first agent and the heavy metal contaminated soil for maintenance; and (2) adding the secondary agent to a mixture obtained in the step (1), and stirring the secondary agent and the mixture for maintenance. The linkage stabilizing agent disclosed by the invention is obvious on treatment effects of complex heavy metal contaminated soil or substrate sludge, is long-lasting in heavy metal stabilization effects, and besides, secondary pollution cannot be caused; the linkage stabilizing agent is small in addition proportion and low in construction cost and has obvious economic benefits.
Description
Technical field
The invention belongs to Hazardous wastes process and disposal field, relate to stablizer and method that process contains the Hazardous wastes of heavy metal, be specifically related to a kind of interlock stablizer and restorative procedure of restoration of soil polluted by heavy metal, the method can complexing body weight metal in stable, reduces its stripping quantity.
Background technology
Along with propelling and the industrial and agricultural development of national urbanization process, the plurality of heavy metal waste water produced in industry and high-moisture percentage heavy metal body refuse (water ratio is 70 ~ 80%) pollute Soil Surrounding.
As, the eighties in 20th century, China's electroplating industry mode of production is main mainly with extensive production.In plating production process, there is a lot of workshop section all will produce the very high factory effluent of Pollutant levels, this chromate waste water, copper-containing wastewater, zinc-containing water etc. wherein, very large on the impact of environment, and electroplating wastewater water quality more complicated, natural sedimentation rate is low, and transport property is stronger.The stacking of plating raw material extensive style, the untreated discharge of electroplating wastewater and mist of chromic acid uncontrollable discharge etc., cause the transverse direction of plating factory building, factory building periphery and longitudinal space to be polluted.
According to investigations, when various heavy Electroplating Production is gone through in same factory site, easily there is complex reaction with organic matter, inorganic ion, micelle particle, polysaccharide etc. in the heavy metal ion flowing into Soil Surrounding environment, heavy metal ion exists in toxicity mode and has higher stability, is difficult to carry out reducing and precipitin reaction.
As far back as the eighties in 20th century, the country such as American-European just brings into use stabilization technology to dispose heavy metal in soil, the Hazardous wastes such as waste residue containing heavy metal.This technology has the bioactive effect of permanent removal heavy metal, is the common technology of a repairing heavy metal pollution.
Stabilization technology, namely by adding the means of reductibility medicament, oxidisability medicament, precipitation agent, sequestrant, macromolecular polysaccharide or natural mineral, to make in medium easily to move, the heavy metal ion of stripping is converted into that stability is high, transfer ability is low or the existing forms of lifeless matter toxicity, to control the harm of heavy metal to environment and people and animals.
Common heavy metal stabilization medicament is mainly to reduce, to precipitate medicament, as sulfide, natural mineral etc.But may occur some difficult problems in the process of application: as when 1. Heavy Metals in Soil Contaminated content is higher, stabilization agent consumption is large, cost is higher; 2. for the heavy metal contamination that Electroplate Factory produces, if when there is various heavy complexing phenomenon, common stabilizer function is less or inoperative.
Summary of the invention
In order to solve the problems of the technologies described above, the stabilization that the present invention is directed to Electroplate Factory's complexing body heavy-metal contaminated soil is administered, and provides a kind of cheapness, the interlock stablizer of efficient, environmental protection and the restorative procedure thereof of repairing Electroplate Factory's complexing body heavy-metal contaminated soil.
The interlock stablizer main component that the present invention adopts is ferrous sulfate, sulfide, calcium hydroxide, adjustment PH values can be played, abolish the Complex effect of Compound Heavy Metals, reduction of hexavalent chromium, and with the heavy metal generation precipitating actions etc. such as heavy metal lead, copper, zinc, cadmium:
(1) with ferrous sulfate, sulfide, calcium hydroxide, montmorillonite, calcium oxide and silicon-dioxide for raw material, stabilization treatment is carried out to heavy metals such as the sexavalent chrome in Electroplate Factory's contaminated soil or bed mud, lead, copper, zinc, cadmiums.
(2) first by ferrous sulfate, montmorillonite and enforcement medium earth hybrid reaction by a certain percentage, abolish the Complex effect of Compound Heavy Metals in medium, part hexavalent chrome reduction is become trivalent chromium.
(3) by sulfide, calcium hydroxide, calcium oxide and silicon-dioxide and enforcement medium earth hybrid reaction, reduction of hexavalent chromium, and with the heavy metal generation precipitating actions such as heavy metal lead, copper, zinc, cadmium.
Particularly, the invention provides a kind of interlock stablizer of restoration of soil polluted by heavy metal, comprising:
Potion, it comprises ferrous sulfate and montmorillonite;
Two doses, it comprises sulfide, calcium hydroxide, calcium oxide and silicon-dioxide.
Preferably, in potion, the weight ratio of ferrous sulfate and montmorillonite is 0.7 ~ 2:0.3 ~ 0.8; The weight ratio of two doses of medium sulphide contents, calcium hydroxide, calcium oxide and silicon-dioxide is 0.5 ~ 1.5:0.25 ~ 0.75:0.13 ~ 0.38:0.12 ~ 0.37.
More preferably, in potion, the weight ratio of ferrous sulfate and montmorillonite is 2:0.5; The weight ratio of two doses of medium sulphide contents, calcium hydroxide, calcium oxide and silicon-dioxide is 1:0.5:0.25:0.25.
Preferably, described sulfide is sodium sulphite.
The present invention also provides the method for above-mentioned interlock stablizer restoration of soil polluted by heavy metal, comprises the steps:
1) potion is added in heavy-metal contaminated soil, stir, leave standstill maintenance;
2) add two doses in the mixture obtained to step 1), stir, leave standstill maintenance.
Preferably, in step 1), the weight ratio of potion and heavy-metal contaminated soil is 1 ~ 2.8:100; Step 2) in two doses be 1 ~ 3:100 with the weight ratio of heavy-metal contaminated soil.
Preferably, in step 1), the weight ratio of potion and heavy-metal contaminated soil is 2.5:100; Step 2) in two doses be 2:100 with the weight ratio of heavy-metal contaminated soil.
Preferably, the curing time of step 1) is 10 ~ 30min; Step 2) curing time be 0.5 ~ 2 day.
Preferably, in described heavy-metal contaminated soil containing, for example lower heavy metal element sexavalent chrome, copper, zinc and lead.
Preferably, described heavy-metal contaminated soil is Electroplate Factory's complexing body heavy-metal contaminated soil.
Compared with common stabilization technology, the present invention has following advantage:
(1) interlock stablizer of the present invention is obvious to complexing body heavy-metal contaminated soil or bed mud regulation effect, and heavy metal stabilization is permanent, can not cause secondary pollution simultaneously;
(2) interlock stablizer adding proportion of the present invention is less, and construction cost is low, has obvious economic benefit.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described, can better understand the present invention and can be implemented, but illustrated embodiment is not as a limitation of the invention to make those skilled in the art.
In following examples of the present invention, heavy-metal contaminated soil gets Hubei Electroplate Factory pollution soil sample, through experimental determination analysis, containing sexavalent chrome 108.9mg/L, copper 1.99mg/L, zinc 2.54mg/L, plumbous 0.82mg/L in this pedotheque leach liquor.(note: target landfill scheme is with reference to " solid waste Leaching leaching method sulfonitric method " (HJ/T299-2007))
Embodiment 1
Performance is as follows:
(1) be first potion in mass ratio by the confection (potion) of ferrous sulfate, montmorillonite: ratio mixing (ferrous sulfate 2, montmorillonite 0.5) stirring reaction of soil=2.5:100, and maintenance 20min;
(2) sodium sulphite, calcium hydroxide, calcium oxide and silicon-dioxide confection (two doses) are two doses in mass ratio: ratio mixing (sodium sulphite 1, calcium hydroxide 0.5, calcium oxide 0.25, silicon-dioxide 0.25) stirring reaction of soil=2:100, and maintenance 1d;
(3) employing " the chromic mensuration diphenyl carbazide spectrophotometry of solid waste " (GB/T15555.4-1995), " Copper in Water, zinc, lead, Cadmium detrmination atomic absorption spectrophotometry " (GBT7475-87) do Leaching Heavy Metals to sample after maintenance and measure.
Result shows, and after process, in sample, each Leaching of Heavy Metals concentration is sexavalent chrome 0.02mg/L, copper 0.01mg/L, zinc 0.05mg/L, plumbous 0.005mg/L, all lower than " water environment quality standard " IV class water body standard value.
Embodiment 2
Performance is as follows:
(1) be first potion in mass ratio by the confection (potion) of ferrous sulfate, montmorillonite: ratio mixing (ferrous sulfate 0.7, montmorillonite 0.3) stirring reaction of soil=1:100, and maintenance 20min;
(2) sodium sulphite, calcium hydroxide, calcium oxide and silicon-dioxide confection (two doses) are two doses in mass ratio: ratio mixing (sodium sulphite 0.8, calcium hydroxide 0.3, calcium oxide 0.2, silicon-dioxide 0.2) stirring reaction of soil=1.5:100, and maintenance 1d;
(3) employing " the chromic mensuration diphenyl carbazide spectrophotometry of solid waste " (GB/T15555.4-1995), " Copper in Water, zinc, lead, Cadmium detrmination atomic absorption spectrophotometry " (GBT7475-87) do Leaching Heavy Metals to sample after maintenance and measure.
Result shows, and after process, in sample, each Leaching of Heavy Metals concentration is sexavalent chrome 1.05mg/L, copper 0.57mg/L, zinc 0.92mg/L, plumbous 0.11mg/L, all lower than " water environment quality standard " IV class water body standard value.
Embodiment 3
Performance is as follows:
(1) be first potion in mass ratio by the confection (potion) of ferrous sulfate, montmorillonite: ratio mixing (ferrous sulfate 1.5, montmorillonite 0.8) stirring reaction of soil=2.3:100, and maintenance 20min;
(2) sodium sulphite, calcium hydroxide, calcium oxide and silicon-dioxide confection (two doses) are two doses in mass ratio: ratio mixing (sodium sulphite 0.5, calcium hydroxide 0.25, calcium oxide 0.13, silicon-dioxide 0.12) stirring reaction of soil=1:100, and maintenance 1d;
(3) employing " the chromic mensuration diphenyl carbazide spectrophotometry of solid waste " (GB/T15555.4-1995), " Copper in Water, zinc, lead, Cadmium detrmination atomic absorption spectrophotometry " (GBT7475-87) do Leaching Heavy Metals to sample after maintenance and measure.
Result shows, and after process, in sample, each Leaching of Heavy Metals concentration is sexavalent chrome 0.07mg/L, copper 0.05mg/L, zinc 0.08mg/L, plumbous 0.009mg/L, all lower than " water environment quality standard " IV class water body standard value.
Embodiment 4
Performance is as follows:
(1) be first potion in mass ratio by the confection (potion) of ferrous sulfate, montmorillonite: ratio mixing (ferrous sulfate 2, montmorillonite 0.8) stirring reaction of soil=2.8:100, and maintenance 20min;
(2) sodium sulphite, calcium hydroxide, calcium oxide and silicon-dioxide confection (two doses) are two doses in mass ratio: ratio mixing (sodium sulphite 1.5, calcium hydroxide 0.75, calcium oxide 0.38, silicon-dioxide 0.37) stirring reaction of soil=3:100, and maintenance 1d;
(3) employing " the chromic mensuration diphenyl carbazide spectrophotometry of solid waste " (GB/T15555.4-1995), " Copper in Water, zinc, lead, Cadmium detrmination atomic absorption spectrophotometry " (GBT7475-87) do Leaching Heavy Metals to sample after maintenance and measure.
Result shows, and after process, in sample, each Leaching of Heavy Metals concentration is sexavalent chrome 0.01mg/L, copper 0.01mg/L, zinc 0.03mg/L, plumbous 0.005mg/L, all lower than " water environment quality standard " IV class water body standard value.
The above embodiment is only that protection scope of the present invention is not limited thereto in order to absolutely prove the preferred embodiment that the present invention lifts.The equivalent alternative or conversion that those skilled in the art do on basis of the present invention, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (10)
1. an interlock stablizer for restoration of soil polluted by heavy metal, is characterized in that, comprising:
Potion, it comprises ferrous sulfate and montmorillonite;
Two doses, it comprises sulfide, calcium hydroxide, calcium oxide and silicon-dioxide.
2. interlock stablizer according to claim 1, is characterized in that, in potion, the weight ratio of ferrous sulfate and montmorillonite is 0.7 ~ 2:0.3 ~ 0.8; The weight ratio of two doses of medium sulphide contents, calcium hydroxide, calcium oxide and silicon-dioxide is 0.5 ~ 1.5:0.25 ~ 0.75:0.13 ~ 0.38:0.12 ~ 0.37.
3. interlock stablizer according to claim 1, is characterized in that, in potion, the weight ratio of ferrous sulfate and montmorillonite is 2:0.8; The weight ratio of two doses of medium sulphide contents, calcium hydroxide, calcium oxide and silicon-dioxide is 1.5:0.75:0.38:0.37.
4. the interlock stablizer according to any one of claim 1 ~ 3, is characterized in that, described sulfide is sodium sulphite.
5. the method for the interlock stablizer restoration of soil polluted by heavy metal described in any one of claim 1 ~ 4, is characterized in that, comprise the steps:
1) potion is added in heavy-metal contaminated soil, stir, leave standstill maintenance;
2) add two doses in the mixture obtained to step 1), stir, leave standstill maintenance.
6. method according to claim 5, is characterized in that, in step 1), the weight ratio of potion and heavy-metal contaminated soil is 1 ~ 2.8:100; Step 2) in two doses be 1 ~ 3:100 with the weight ratio of heavy-metal contaminated soil.
7. method according to claim 5, is characterized in that, in step 1), the weight ratio of potion and heavy-metal contaminated soil is 2.8:100; Step 2) in two doses be 3:100 with the weight ratio of heavy-metal contaminated soil.
8. method according to claim 5, is characterized in that, the curing time of step 1) is 10 ~ 30min; Step 2) curing time be 0.5 ~ 2 day.
9. method according to claim 5, is characterized in that, containing, for example lower heavy metal element sexavalent chrome, copper, zinc and lead in described heavy-metal contaminated soil.
10. method according to claim 5, is characterized in that, described heavy-metal contaminated soil is Electroplate Factory's complexing body heavy-metal contaminated soil.
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| CN105542792A (en) * | 2016-02-04 | 2016-05-04 | 周益辉 | Heavy metal pollution soil restoration agent and application thereof |
| CN105694894A (en) * | 2016-03-18 | 2016-06-22 | 济南大学 | Preparation method and application of hexavalent chromium contaminated soil conditioner |
| CN105950153A (en) * | 2016-07-05 | 2016-09-21 | 湖南省环境保护科学研究院 | Composite stabilizer for contaminated soil and method for treating contaminated soil by virtue of composite stabilizer |
| CN106216385A (en) * | 2016-07-27 | 2016-12-14 | 湖南恒凯环保科技投资有限公司 | A kind of contact break stabilisation restorative procedure of heavy-metal contaminated soil |
| CN106318400A (en) * | 2016-08-04 | 2017-01-11 | 北京高能时代环境技术股份有限公司 | Stabilization agent and method for restoring As solid waste-containing As-polluted soil |
| CN107021853A (en) * | 2017-03-23 | 2017-08-08 | 格丰科技材料有限公司 | Fertilizers of restoration of soil polluted by heavy metal and its preparation method and application |
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| CN105542792A (en) * | 2016-02-04 | 2016-05-04 | 周益辉 | Heavy metal pollution soil restoration agent and application thereof |
| CN105694894A (en) * | 2016-03-18 | 2016-06-22 | 济南大学 | Preparation method and application of hexavalent chromium contaminated soil conditioner |
| CN105950153A (en) * | 2016-07-05 | 2016-09-21 | 湖南省环境保护科学研究院 | Composite stabilizer for contaminated soil and method for treating contaminated soil by virtue of composite stabilizer |
| CN106216385A (en) * | 2016-07-27 | 2016-12-14 | 湖南恒凯环保科技投资有限公司 | A kind of contact break stabilisation restorative procedure of heavy-metal contaminated soil |
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| CN110387240B (en) * | 2019-06-21 | 2021-12-21 | 广西博世科环保科技股份有限公司 | Passivator for repairing multi-metal composite contaminated soil and use method thereof |
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