CN102732259B - A kind of heavy metal contamination crystallization encapsulating stabilization agent and using method thereof - Google Patents
A kind of heavy metal contamination crystallization encapsulating stabilization agent and using method thereof Download PDFInfo
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- CN102732259B CN102732259B CN201210212001.3A CN201210212001A CN102732259B CN 102732259 B CN102732259 B CN 102732259B CN 201210212001 A CN201210212001 A CN 201210212001A CN 102732259 B CN102732259 B CN 102732259B
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 63
- 230000006641 stabilisation Effects 0.000 title claims abstract description 49
- 238000011105 stabilization Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000011109 contamination Methods 0.000 title claims abstract description 20
- 238000002425 crystallisation Methods 0.000 title claims abstract description 17
- 230000008025 crystallization Effects 0.000 title claims abstract description 17
- 239000002689 soil Substances 0.000 claims abstract description 101
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 51
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 239000002734 clay mineral Substances 0.000 claims abstract description 19
- 238000002386 leaching Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000013522 chelant Substances 0.000 claims abstract description 7
- 150000003016 phosphoric acids Chemical class 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000012423 maintenance Methods 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 150000003839 salts Chemical class 0.000 claims description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 9
- 239000004113 Sepiolite Substances 0.000 claims description 9
- 229910052785 arsenic Inorganic materials 0.000 claims description 9
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 9
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 9
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 9
- 229910052624 sepiolite Inorganic materials 0.000 claims description 9
- 235000019355 sepiolite Nutrition 0.000 claims description 9
- 230000004888 barrier function Effects 0.000 claims description 8
- 229910052900 illite Inorganic materials 0.000 claims description 8
- 238000011835 investigation Methods 0.000 claims description 8
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 claims description 8
- 238000002203 pretreatment Methods 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical group [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- 229920001021 polysulfide Polymers 0.000 claims description 4
- 239000005077 polysulfide Substances 0.000 claims description 4
- 150000008117 polysulfides Polymers 0.000 claims description 4
- 239000004343 Calcium peroxide Substances 0.000 claims description 3
- 150000004645 aluminates Chemical class 0.000 claims description 3
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 claims description 3
- 235000019402 calcium peroxide Nutrition 0.000 claims description 3
- 239000003469 silicate cement Substances 0.000 claims description 2
- 239000011790 ferrous sulphate Substances 0.000 claims 1
- 235000003891 ferrous sulphate Nutrition 0.000 claims 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 10
- 230000004048 modification Effects 0.000 description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 3
- MVZXTUSAYBWAAM-UHFFFAOYSA-N iron;sulfuric acid Chemical compound [Fe].OS(O)(=O)=O MVZXTUSAYBWAAM-UHFFFAOYSA-N 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000001988 toxicity Effects 0.000 description 3
- 231100000419 toxicity Toxicity 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- JNVCSEDACVAATK-UHFFFAOYSA-L [Ca+2].[S-]SSS[S-] Chemical compound [Ca+2].[S-]SSS[S-] JNVCSEDACVAATK-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- -1 plumbous Chemical compound 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229940051851 sulfurated lime Drugs 0.000 description 1
- 231100000820 toxicity test Toxicity 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Abstract
The present invention relates to a kind of heavy metal contamination crystallization encapsulating stabilization agent and application method thereof, it is characterized in that: this stabilization agent is grouped into by the one-tenth of following mass ratio, phosphoric acid salt or vitriol 15-25%, heavy metal chelant 1%-5%, gelling material 20-40%, clay mineral 30-60%, its raw material summation is 100%.Relative to prior art, technical scheme of the present invention is simple, and effect is better, and cost is lower, implementation method easy handling, and after implementing the program, the Leaching of heavy metal in soil reaches the relevant criterion of country, and the soil resourcebility recycling after process.The present invention adopts pre-judgement and pretreated mode, reaches and pollutes to various heavy the stabilization effect all obtaining excellence.
Description
Technical field
The invention belongs to technical field of resource environments, be specifically related to a kind of soil restoring technology, especially relate to a kind of heavy metal contamination crystallization encapsulating stabilization agent and using method thereof.
Background technology
Soil is the basic substance that the mankind depend on for existence, along with China's industrialization, the quickening of urbanization process, to leave over a large amount of contaminated lands after the resettlement of cities and towns industrial enterprise, wherein, it is typical pollutant type in soil that heavy metal in soil pollutes, mainly contain chromium, plumbous, mercury, arsenic, copper, zinc etc. are more common heavy metal contamination, poisonous metal in soil runs up to a certain degree will to soil, botanical system produces poisons, not only cause the decline of soil quality, the more important thing is the safety having influence on agricultural-food, and by food chain, human and animal's health is constituted a serious threat.
The Pollution abatement of heavy metal in soil and the difficulty of reparation are comparatively large, and in prior art, relevant method of administering soil pollution is limited, common as, contaminated soil drip-rinsing process, plant growing concentration method, cement class immobilization method etc. with much money.Although aforesaid method achieves certain effect to a certain extent, still there is the problems such as expense is higher, soil fertility reduces, implementation process is complicated and the cycle is longer, solidification resource reutilization is difficult.Therefore, economical, solve heavy metal pollution of soil quickly and efficiently, prevent heavy metal from entering food chain, improve the quality of life of the mankind and become a very urgent task of society.
Heavy metal crystallization wrapper technology (CCT) is based on principles such as chemistry redox, precipitation, absorption and crystallization, by the heavy metal inactivation in soil or bed mud, seizure being encapsulated in the lens of stable existence.This technology original position or dystopy can be applied to the solidification that water ratio is the heavy-metal contaminated soil, slag, pretreated bed mud in river, building waste etc. of 0 ~ 40%
/stabilization safe handling, the soil after improvement can not change its soil morphology substantially, can form the solidify material of the ultimate compression strength with more than 1MPa yet, or as roadbed material.
Because different pollutent has different toxicity, precipitative properties, chelating properties and transfer ability, therefore to take for different pollutents different stable/solidifying agent.Especially, when pollutent is variable valency metal, stable/solidification treatment then will consider more factor, because their valence state is by their precipitation of remarkably influenced and migrate attribute.Heavy metal crystallization encapsulating stabilization agent in the present invention, for there is two or more heavy metal contamination in soil, adopts pre-judgement and pretreated mode, reaches and all obtain excellent stabilization effect to various heavy pollution.
Summary of the invention
The present invention pollutes insoluble technical problem for prior art heavy metal in soil just, provides a kind of cost low, effective, implements heavy metal contamination crystallization encapsulating stabilization agent that is simple, that be beneficial to popularization and using method thereof
In order to solve the problems of the technologies described above, technical scheme of the present invention is as follows: a kind of heavy metal contamination crystallization encapsulating stabilization agent, be called for short CCT01, it is characterized in that: this stabilization agent is grouped into by the one-tenth of following mass ratio, phosphoric acid salt or vitriol 15-25%, heavy metal chelant 1%-5%, gelling material 20-40%, clay mineral 30-60%, its raw material summation is 100%.
As a modification of the present invention, described gelling material is one or several in silicate cement or aluminate cement or aluminosulfate cement, and described clay mineral is one or several in montmorillonite or sepiolite or illite.
As a modification of the present invention, described phosphoric acid salt or vitriol 20-22%, heavy metal chelant 3%-5%, gelling material 30-35%, clay mineral 40-50%, its raw material summation is 100%.
Another kind of technical scheme of the present invention is, a kind of heavy metal contamination crystallization encapsulating stabilization agent, is called for short CCT02, it is characterized in that: this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt 10-30%, oxygenant 30-50%, clay mineral 30-60%, its raw material summation is 100%.
As a modification of the present invention, described oxygenant is manganese oxide or hydrogen peroxide or calcium peroxide.
As a modification of the present invention, described clay mineral is one or several in montmorillonite or sepiolite or illite.
As a modification of the present invention, this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt 20-25%, oxygenant 35-45%, clay mineral 35-50%, and its raw material summation is 100%.
Another kind of technical scheme of the present invention is, be called for short CCT03, it is characterized in that: this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt 30-50%, polysulfide 15-30%, clay mineral 30-60%, its raw material summation is 100%.
As a modification of the present invention, described clay mineral is one or several in montmorillonite or sepiolite or illite.
As a modification of the present invention, this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt 35-45%, polysulfide 20-25%, clay mineral 35-55%, and its raw material summation is 100%.
Implementation method of the present invention is, a kind of using method being applicable to the stablizer of heavy-metal contaminated soil, is characterized in that: said method comprising the steps of:
(1) utilize mechanical means to excavate needing the Polluted area repaired, and will be evenly distributed on the impervious barrier of place after contaminated soil crushing and screening;
(2) according to investigation result in early stage, contaminated soil is judged in advance, anticipation result and corresponding pre-treatment as follows:
A) if not containing heavy metal contamination of appraising at the current rate, then step (3) is directly entered;
B) if containing the heavy metal that appraises at the current rate such as trivalent arsenic in contaminated soil, CCT02 arsenic specific agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT02 adding proportion accounts for the 2-15% of soil weight, maintenance half a day;
C) if containing the heavy metal that appraises at the current rate such as sexavalent chrome in contaminated soil, CCT03 chromium specific agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT03 adding proportion accounts for soil weight 2-10%, maintenance half a day;
(3) pervasive for CCT01 stabilization agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT01 adding proportion accounts for the 3-20% of soil weight
(4), after being fully uniformly mixed, maintenance 3-10 days, carries out sample detecting, and detects the Leaching of heavy metal in soil.
As a modification of the present invention, the step B in described step (2)) in, CCT02 adding proportion accounts for the 3-10% of soil weight.
As a modification of the present invention, the step C in described step (2)) in, CCT03 adding proportion accounts for the 3-8% of soil weight.
As a modification of the present invention, in described step (3), CCT01 adding proportion accounts for the 5-15% of soil weight.
Relative to prior art, technical scheme of the present invention is simple, and effect is better, and cost is lower, implementation method easy handling, and after implementing the program, the Leaching of heavy metal in soil reaches the relevant criterion of country, and the soil resourcebility recycling after process.The present invention adopts pre-judgement and pretreated mode, reaches and pollutes to various heavy the stabilization effect all obtaining excellence.
Stabilization agent effect assessment adopts leaching toxicity test.At present, China does not also have special unified stabilization effect to leach judgement criteria, recommend method is as follows: according to China " solid waste Leaching leaching method sulfonitric method " (HJ/T 299-2007) or with reference to Environmental Protection in America portion (USEPA) toxicity leach standard Toxicity characteristic leaching procedure (TCLP) specific requirement and program carry out, first the leaching concentration of process after stain soil should be less than " Hazardous wastes judging standard-leaching characteristic identification " (GB5085.3-2007), can according to " general industrial solid waste is stored, disposal site Environmental capacity standard " (GB 18599-2001) dispose.If soil utilizes as roadbed material recycling or common engineering dregs after stabilization reparation, because rainwater or underground water leaching can may be subject to, IV class water quality standard (recommendation) that its leach liquor should meet " GB/T 14848-93 groundwater quality standard " in its process.
Embodiment
In order to deepen the understanding of the present invention, the technical scheme below for this invention is described in detail.
embodiment 1:
CCT01: this stabilization agent is grouped into by the one-tenth of following mass ratio, phosphoric acid salt 15%, heavy metal chelant 3%, aluminosulfate cement 22%, sepiolite 60%, its raw material summation is 100%.
embodiment 2:
CCT01: this stabilization agent is grouped into by the one-tenth of following mass ratio, phosphoric acid salt 23%, heavy metal chelant 4%, aluminate cement 25%, montmorillonite 48%, its raw material summation is 100%.
embodiment 3:
CCT02: this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt preferably sulfuric acid iron 10%, calcium peroxide 50%, sepiolite 40%, its raw material summation is 100%.
embodiment 4:
CCT02: this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt preferably sulfuric acid iron 15%, manganese oxide 40%, illite 45%, its raw material summation is 100%.
embodiment 5:
CCT02: this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt preferably sulfuric acid iron 28%, hydrogen peroxide 36%, montmorillonite 36%, its raw material summation is 100%.
embodiment 6:
CCT03: this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt preferably sulfuric acid ferrous iron 30%, sodium sulfide 30%, sepiolite 40%, its raw material summation is 100%.
embodiment 7:
CCT03: this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt preferably sulfuric acid ferrous iron 40%, sulfurated lime 15%, montmorillonite 45%, its raw material summation is 100%.
embodiment 8:
CCT03: this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt preferably sulfuric acid ferrous iron 45%, sodium sulphite 18%, illite 37%, its raw material summation is 100%.
embodiment 9:
A kind of using method being applicable to the stablizer of heavy-metal contaminated soil:
Step is as follows:
(1) utilize machinery to excavate needing the Polluted area repaired to excavate, and will be evenly distributed on the impervious barrier of place after contaminated soil crushing and screening;
(2) according to investigation result in early stage, contaminated soil is judged in advance, anticipation result and corresponding pre-treatment as follows:
A) not containing heavy metal contamination of appraising at the current rate, then step (3) is directly entered;
(3) pervasive for CCT01 stabilization agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT01 adding proportion accounts for the 3-15% of soil weight;
(4), after being fully uniformly mixed, maintenance 3-10 days, carries out sample detecting, and detects the Leaching of heavy metal in soil.Result is as shown in the table:
embodiment 10:
A kind of using method being applicable to the stablizer of heavy-metal contaminated soil:
Step is as follows:
(1) utilize machinery to excavate needing the Polluted area repaired to excavate, and will be evenly distributed on the impervious barrier of place after contaminated soil crushing and screening;
(2) according to investigation result in early stage, contaminated soil is judged in advance, anticipation result and corresponding pre-treatment as follows:
A) not containing heavy metal contamination of appraising at the current rate, then step (3) is directly entered;
(3) pervasive for CCT01 stabilization agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT01 adding proportion accounts for the 3-15% of soil weight;
(4), after being fully uniformly mixed, maintenance 3-10 days, carries out sample detecting, and detects the Leaching of heavy metal in soil.Result is as shown in the table:
embodiment 11:
Be applicable to a using method for the stablizer of heavy-metal contaminated soil, step is as follows:
(1) utilize machinery to excavate needing the Polluted area repaired to excavate, and will be evenly distributed on the impervious barrier of place after contaminated soil crushing and screening;
(2) according to investigation result in early stage, contaminated soil is judged in advance, anticipation result and corresponding pre-treatment as follows:
B) if containing the heavy metal that appraises at the current rate such as trivalent arsenic in contaminated soil, CCT02 arsenic specific agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT02 adding proportion accounts for the 3-15% of soil weight, maintenance half a day;
(3) pervasive for CCT01 stabilization agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT01 adding proportion accounts for the 3-20% of soil weight
(4), after being fully uniformly mixed, maintenance 3-10 days, carries out sample detecting, and detects the Leaching of heavy metal in soil.Result represents as follows:
embodiment 12:
Be applicable to a using method for the stablizer of heavy-metal contaminated soil, step is as follows:
(1) utilize machinery to excavate needing the Polluted area repaired to excavate, and will be evenly distributed on the impervious barrier of place after contaminated soil crushing and screening;
(2) according to investigation result in early stage, contaminated soil is judged in advance, anticipation result and corresponding pre-treatment as follows:
B) if containing the heavy metal that appraises at the current rate such as trivalent arsenic in contaminated soil, CCT02 arsenic specific agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT02 adding proportion accounts for the 3-15% of soil weight, maintenance half a day;
(3) pervasive for CCT01 stabilization agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT01 adding proportion accounts for the 3-20% of soil weight
(4), after being fully uniformly mixed, maintenance 3-10 days, carries out sample detecting, and detects the Leaching of heavy metal in soil.Result represents as follows:
embodiment 13:
Be applicable to a using method for the stablizer of heavy-metal contaminated soil, step is as follows:
(1) utilize machinery to excavate needing the Polluted area repaired to excavate, and will be evenly distributed on the impervious barrier of place after contaminated soil crushing and screening;
(2) according to investigation result in early stage, contaminated soil is judged in advance, anticipation result and corresponding pre-treatment as follows:
C) if containing the heavy metal that appraises at the current rate such as sexavalent chrome in contaminated soil, CCT03 chromium specific agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT03 adding proportion accounts for soil weight 2-10%, maintenance half a day;
(3) pervasive for CCT01 stabilization agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT01 adding proportion accounts for the 3-20% of soil weight
(4), after being fully uniformly mixed, maintenance 3-10 days, carries out sample detecting, and detects the Leaching of heavy metal in soil.Result represents as follows:
embodiment 14:
Be applicable to a using method for the stablizer of heavy-metal contaminated soil, step is as follows:
(1) utilize machinery to excavate needing the Polluted area repaired to excavate, and will be evenly distributed on the impervious barrier of place after contaminated soil crushing and screening;
(2) according to investigation result in early stage, contaminated soil is judged in advance, anticipation result and corresponding pre-treatment as follows:
C) if containing the heavy metal that appraises at the current rate such as sexavalent chrome in contaminated soil, CCT03 chromium specific agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT03 adding proportion accounts for soil weight 2-10%, maintenance half a day;
(3) pervasive for CCT01 stabilization agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT01 adding proportion accounts for the 3-20% of soil weight
(4), after being fully uniformly mixed, maintenance 3-10 days, carries out sample detecting, and detects the Leaching of heavy metal in soil.Result represents as follows:
Can find out, after adopting technical scheme of the present invention, the leaching concentration of heavy metal all reaches relevant standard, and embodiment is simple, convenient operation.
It should be noted that, above-described embodiment is only better embodiment of the present invention, is not used for limiting protection scope of the present invention, and protection scope of the present invention is as the criterion with claims.
Claims (12)
1. a heavy metal contamination crystallization encapsulating stabilization agent, be called for short CCT02, it is characterized in that: this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt 10-30%, oxygenant 30-50%, clay mineral 30-60%, its raw material summation is 100%.
2. heavy metal contamination crystallization according to claim 1 encapsulating stabilization agent, is characterized in that: described oxygenant is manganese oxide or hydrogen peroxide or calcium peroxide.
3. heavy metal contamination crystallization according to claim 1 and 2 encapsulating stabilization agent, is characterized in that: described clay mineral is one or several in montmorillonite or sepiolite or illite.
4. heavy metal contamination crystallization encapsulating stabilization agent according to claim 1 and 2, it is characterized in that: this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt 20-25%, oxygenant 35-45%, clay mineral 35-50%, its raw material summation is 100%.
5. a heavy metal contamination crystallization encapsulating stabilization agent, be called for short CCT03, it is characterized in that: this stabilization agent is grouped into by the one-tenth of following mass ratio, iron system salt 30-50%, polysulfide 15-30%, clay mineral 30-60%, its raw material summation is 100%.
6. heavy metal contamination crystallization according to claim 5 encapsulating stabilization agent, is characterized in that: described clay mineral is one or several in montmorillonite or sepiolite or illite.
7. heavy metal contamination crystallization encapsulating stabilization agent according to claim 5, it is characterized in that: this stabilization agent is grouped into by the one-tenth of following mass ratio, ferrous sulfate 35-45%, polysulfide 20-25%, clay mineral 35-55%, its raw material summation is 100%.
8. be applicable to a using method for the stablizer of heavy-metal contaminated soil, it is characterized in that, said method comprising the steps of:
(1) utilize mechanical means to excavate needing the Polluted area repaired, and will be evenly distributed on the impervious barrier of place after contaminated soil crushing and screening;
(2) according to investigation result in early stage, contaminated soil is judged in advance, anticipation result and corresponding pre-treatment as follows:
A) if not containing heavy metal contamination of appraising at the current rate, then step (3) is directly entered;
B) if to appraise at the current rate heavy metal containing trivalent arsenic in contaminated soil, the CCT02 arsenic specific agent described in any one of claim 1-4 is added directly to contaminated soil, and the mixing and stirring that adds water, CCT02 adding proportion accounts for the 2-15% of soil weight, maintenance half a day;
C) if to appraise at the current rate heavy metal containing sexavalent chrome in contaminated soil, the CCT03 chromium specific agent described in any one of claim 5-7 is added directly to contaminated soil, and the mixing and stirring that adds water, CCT03 adding proportion accounts for soil weight 2-10%, maintenance half a day;
(3) pervasive for CCT01 stabilization agent is added directly to contaminated soil, and the mixing and stirring that adds water, CCT01 adding proportion accounts for the 3-20% of soil weight; The one-tenth of the following mass ratio of the pervasive stabilization agent of described CCT01 is grouped into, phosphoric acid salt or vitriol 15-25%, heavy metal chelant 1%-5%, gelling material 20-40%, clay mineral 30-60%, and its raw material summation is 100%; Described gelling material is one or several in silicate cement or aluminate cement or aluminosulfate cement, and described clay mineral is one or several in montmorillonite or sepiolite or illite;
(4), after being fully uniformly mixed, maintenance 3-10 days, carries out sample detecting, and detects the Leaching of heavy metal in soil.
9. the using method of stablizer according to claim 8, is characterized in that: the step B in described step (2)) in, CCT02 adding proportion accounts for the 3-10% of soil weight.
10. the using method of stablizer according to claim 9, is characterized in that: the step C in described step (2)) in, CCT03 adding proportion accounts for the 3-8% of soil weight.
The using method of 11. stablizers according to claim 10, is characterized in that: in described step (3), CCT01 adding proportion accounts for the 5-15% of soil weight.
The using method of 12. stablizers according to claim 11, is characterized in that: described phosphoric acid salt or vitriol 20-22%, heavy metal chelant 3%-5%, gelling material 30-35%, clay mineral 40-50%, and its raw material summation is 100%.
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