CN102732259A - Heavy metal polluted crystallization encapsulated stabilizing agent and its application method - Google Patents
Heavy metal polluted crystallization encapsulated stabilizing agent and its application method Download PDFInfo
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- CN102732259A CN102732259A CN2012102120013A CN201210212001A CN102732259A CN 102732259 A CN102732259 A CN 102732259A CN 2012102120013 A CN2012102120013 A CN 2012102120013A CN 201210212001 A CN201210212001 A CN 201210212001A CN 102732259 A CN102732259 A CN 102732259A
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000002425 crystallisation Methods 0.000 title claims abstract description 20
- 230000008025 crystallization Effects 0.000 title claims abstract description 20
- 239000003381 stabilizer Substances 0.000 title abstract 3
- 239000002689 soil Substances 0.000 claims abstract description 101
- 239000002734 clay mineral Substances 0.000 claims abstract description 19
- 230000001988 toxicity Effects 0.000 claims abstract description 15
- 231100000419 toxicity Toxicity 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 51
- 230000006641 stabilisation Effects 0.000 claims description 48
- 238000011105 stabilization Methods 0.000 claims description 48
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 238000011109 contamination Methods 0.000 claims description 21
- 239000002994 raw material Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000002386 leaching Methods 0.000 claims description 17
- 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
- 229910052624 sepiolite Inorganic materials 0.000 claims description 9
- 235000019355 sepiolite Nutrition 0.000 claims description 9
- 229910021647 smectite Inorganic materials 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
- 239000013522 chelant Substances 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
- 150000003016 phosphoric acids Chemical class 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
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- OUUQCZGPVNCOIJ-UHFFFAOYSA-M Superoxide Chemical compound [O-][O] OUUQCZGPVNCOIJ-UHFFFAOYSA-M 0.000 claims description 3
- 150000004645 aluminates Chemical class 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 150000002978 peroxides Chemical class 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
- 238000004064 recycling Methods 0.000 abstract description 2
- 229910019142 PO4 Inorganic materials 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 1
- 239000002738 chelating agent Substances 0.000 abstract 1
- 239000010452 phosphate Substances 0.000 abstract 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 11
- 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
- 230000008569 process Effects 0.000 description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- MVZXTUSAYBWAAM-UHFFFAOYSA-N iron;sulfuric acid Chemical compound [Fe].OS(O)(=O)=O MVZXTUSAYBWAAM-UHFFFAOYSA-N 0.000 description 3
- 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
- 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
- 241000196324 Embryophyta Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 241000403513 Schizostachyum chinense Species 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
- 230000009102 absorption Effects 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
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011156 evaluation Methods 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
- 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
- ZODDGFAZWTZOSI-UHFFFAOYSA-N nitric acid;sulfuric acid Chemical compound O[N+]([O-])=O.OS(O)(=O)=O ZODDGFAZWTZOSI-UHFFFAOYSA-N 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
- 238000005067 remediation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229940051851 sulfurated lime Drugs 0.000 description 1
- 238000005987 sulfurization reaction Methods 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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- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a heavy metal polluted crystallization encapsulated stabilizing agent and its application method, which is characterized in that the stabilizing agent comprises the following components by mass ratio: 15-25% of phosphate or sulfate, 1%-5% of heavy metal chelating agent, 20-40% of cementitious material, 30-60% of clay minerals, and the components for the sum is 100%. Compared with the prior art, the invention has the advantages of simple technical scheme, good effect, low cost and easy operation of implementation method, the leached toxicity of heavy metal in soil can reach the national standards after implementing the scheme, and the processed soil enables resource recycling. According to the invention, a pre-determination and pretreatment mode is used to reach the excellent stable effect on a plurality of heavy metal pollution.
Description
Technical field
The invention belongs to technical field of resource environments, concrete relate to a kind of soil remediation technology, especially relate to a kind of heavy metal contamination crystallization and seal stabilization agent and method of use thereof.
Background technology
Soil is the basic substance that the mankind depend on for existence, and along with China's industriallization, quickening of urbanization process, cities and towns industrial enterprise resettlement back is to leave over a large amount of contaminated lands; Wherein, It is typical pollutant type in the soil that heavy metal in soil pollutes, and mainly contains chromium, lead, mercury, and arsenic, copper, zinc etc. are more common heavy metal contamination; Poisonous metal in the soil runs up to a certain degree will produce soil, botanical system and poisons; Not only cause the decline of soil quality, the more important thing is the safety that has influence on agricultural-food, and human and animal's health is constituted a serious threat through food chain.
The Pollution abatement of heavy metal in soil and the difficulty of reparation are bigger, and in the prior art, relevant method of administering soil pollution is limited, common as, huge sum of money contaminated soil drip-rinsing process, plant growing concentration method, cement class immobilization method etc.Though aforesaid method has been obtained certain effect to a certain extent, exist still that expense is higher, soil fertility reduces, implementation process complicacy and cycle are long, solidify problems such as resource reutilization difficulty.Therefore, economical, quickly and efficiently solve heavy metal pollution of soil, prevent that heavy metal from getting into food chain, improving human life quality and become a very urgent task of current society.
Heavy metal crystallization wrapper technology (CCT) is based on principles such as chemistry redox, deposition, absorption and crystallization, with heavy metal inactivation, seizure in soil or the bed mud and be encapsulated in the lens of stable existence.But this technology original position or dystopy are applied to the curing that water ratio is 0～40% heavy-metal contaminated soil, slag, pretreated bed mud in river, building waste etc.
/The stabilization safe handling, the soil after the improvement can not change its soil morphology basically, can form the solidify material with the above ultimate compression strength of 1MPa yet, or as roadbed material.
Because different pollutents have different toxicity, deposition characteristic, chelating properties and transfer ability, therefore to take different stable/solidifying agent to different pollutents.Especially when pollutent is variable valency metal, stable/solidification treatment then will be considered more factors, because their valence state is with their deposition of remarkably influenced and migrate attribute.Heavy metal crystallization among the present invention is sealed stabilization agent to two or more heavy metal contamination of existence in the soil, adopts the disconnected and pretreated mode of anticipation, has reached various heavy is polluted the stabilization effect of all obtaining excellence.
Summary of the invention
The present invention pollutes insoluble technical problem to the prior art heavy metal in soil just, provides a kind of cost low, effective, implements heavy metal contamination crystallization simple, that be beneficial to popularization and seals stabilization agent and method of use thereof
In order to solve the problems of the technologies described above, technical scheme of the present invention is following: a kind of heavy metal contamination crystallization is sealed stabilization agent, is 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 kind of improvement of the present invention, said gelling material is one or several in silicate cement or aluminate cement or the aluminosulfate cement, and said clay mineral is one or several in smectite or sepiolite or the illite.
As a kind of improvement of the present invention, said 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 that a kind of heavy metal contamination crystallization is sealed 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, and iron is salt 10-30%, oxygenant 30-50%; Clay mineral 30-60%, its raw material summation is 100%.
As a kind of improvement of the present invention, said oxygenant is manganese oxide or ydrogen peroxide 50 or calcium superoxide.
As a kind of improvement of the present invention, said clay mineral is one or several in smectite or sepiolite or the illite.
As a kind of improvement of the present invention, this stabilization agent is grouped into by the one-tenth of following mass ratio, and iron is salt 20-25%, oxygenant 35-45%, and clay mineral 35-50%, its raw material summation is 100%.
Another kind of technical scheme of the present invention does, is called for short CCT03, and it is characterized in that: this stabilization agent is grouped into by the one-tenth of following mass ratio, and iron is salt 30-50%, polysulfide 15-30%, and clay mineral 30-60%, its raw material summation is 100%.
As a kind of improvement of the present invention, said clay mineral is one or several in smectite or sepiolite or the illite.
As a kind of improvement of the present invention, this stabilization agent is grouped into by the one-tenth of following mass ratio, and iron is salt 35-45%, polysulfide 20-25%, and clay mineral 35-55%, its raw material summation is 100%.
Implementation method of the present invention is that a kind of method of use that is applicable to the stablizer of heavy-metal contaminated soil is characterized in that: said method comprising the steps of:
(1) utilize mechanical means that the Polluted area of needs reparation is excavated, and with being evenly distributed on behind the contaminated soil crushing and screening on the impervious barrier of place;
(2) according to early stage investigation result that contaminated soil is carried out anticipation is disconnected, anticipation result and corresponding pre-treatment are following:
A) if do not contain the heavy metal contamination of appraising at the current rate, then directly get into step (3);
B) if contain the heavy metals that appraise at the current rate such as trivalent arsenic in the contaminated soil, CCT02 arsenic specific agent is added directly to contaminated soil, and adds the water mixing and stirring, the CCT02 adding proportion accounts for the 2-15% of soil weight, maintenance half a day;
C) if contain the heavy metals that appraise at the current rate such as sexavalent chrome in the contaminated soil, CCT03 chromium specific agent is added directly to contaminated soil, and adds the water mixing and stirring, the CCT03 adding proportion accounts for soil weight 2-10%, maintenance half a day;
(3) the pervasive stabilization agent of CCT01 is added directly to contaminated soil, and adds the water mixing and stirring, the CCT01 adding proportion accounts for the 3-20% of soil weight
(4) fully mix after, sample detecting is carried out in maintenance 3-10 days, and detects the leaching toxicity of heavy metal in soil.
As a kind of improvement of the present invention, the step B in the said step (2)) in, the CCT02 adding proportion accounts for the 3-10% of soil weight.
As a kind of improvement of the present invention, the step C in the said step (2)) in, the CCT03 adding proportion accounts for the 3-8% of soil weight.
As a kind of improvement of the present invention, the CCT01 adding proportion accounts for the 5-15% of soil weight in the said step (3).
With respect to prior art, technical scheme of the present invention is simple, and effect is better, and cost is lower, and the implementation method easy handling implements that the leaching toxicity of heavy metal in soil reaches relevant national standards after this scheme, but and the soil resource utilization after handling utilize again.The present invention adopts the disconnected and pretreated mode of anticipation, has reached various heavy is polluted the stabilization effect of all obtaining excellence.
Leaching toxicity test is adopted in the evaluation of stabilization pharmacy effect.At present; China does not also have special unified stabilization effect to leach judgement criteria; Recommend method is following: carry out according to " solid waste leaches toxicity leaching method sulfuric acid nitrate method " (the HJ/T 299-2007) of China or with reference to specific requirement and the program of the toxicity leaching standard Toxicity characteristic leaching procedure of U.S. Chinese Ministry of Environmental Protection (USEPA) (TCLP); Handling the leaching concentration of after stain soil at first should less than " Hazardous wastes judging standard-leaching toxicity is differentiated " (GB5085.3-2007) can dispose according to " storage of general industry solid waste, disposal site pollute control criterion " (GB 18599-2001).If soil utilizes as roadbed material recycling or common engineering dregs after the stabilization reparation; Because can possibly receive rainwater or underground water leaching in its process, its leach liquor should satisfy " GB/T 14848-93 groundwater quality standard " IV class water quality standard (recommendation).
Embodiment
In order to deepen, do detailed explanation to the technical scheme of this invention below to understanding of the present invention.
Embodiment 1:
CCT01: this stabilization agent is grouped into by the one-tenth of following mass ratio, phosphoric acid salt 15%, and 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%, and heavy metal chelant 4%, aluminate cement 25%, smectite 48%, its raw material summation is 100%.
Embodiment 3:
CCT02: this stabilization agent is grouped into by the one-tenth of following mass ratio, and iron is salt preferably sulfuric acid iron 10%, calcium superoxide 50%, and 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, and iron is salt preferably sulfuric acid iron 15%, manganese oxide 40%, and 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, and iron is salt preferably sulfuric acid iron 28%, ydrogen peroxide 50 36%, and smectite 36%, its raw material summation is 100%.
Embodiment 6:
CCT03: this stabilization agent is grouped into by the one-tenth of following mass ratio, and iron is that the salt preferably sulfuric acid is ferrous 30%, and sulfuration receives 30%, sepiolite 40%, and its raw material summation is 100%.
Embodiment 7:
CCT03: this stabilization agent is grouped into by the one-tenth of following mass ratio, and iron is that the salt preferably sulfuric acid is ferrous 40%, sulfurated lime 15%, and smectite 45%, its raw material summation is 100%.
Embodiment 8:
CCT03: this stabilization agent is grouped into by the one-tenth of following mass ratio, and iron is that the salt preferably sulfuric acid is ferrous 45%, sodium sulphite 18%, and illite 37%, its raw material summation is 100%.
Embodiment 9:
A kind of method of use that is applicable to the stablizer of heavy-metal contaminated soil:
Step is following:
(1) Polluted area that utilizes machinery to excavate the needs reparation excavates, and with being evenly distributed on behind the contaminated soil crushing and screening on the impervious barrier of place;
(2) according to early stage investigation result that contaminated soil is carried out anticipation is disconnected, anticipation result and corresponding pre-treatment are following:
A) do not contain the heavy metal contamination of appraising at the current rate, then directly get into step (3);
(3) the pervasive stabilization agent of CCT01 is added directly to contaminated soil, and adds the water mixing and stirring, the CCT01 adding proportion accounts for the 3-15% of soil weight;
(4) fully mix after, sample detecting is carried out in maintenance 3-10 days, and detects the leaching toxicity of heavy metal in soil.The result is as shown in the table:
Embodiment 10:
A kind of method of use that is applicable to the stablizer of heavy-metal contaminated soil:
Step is following:
(1) Polluted area that utilizes machinery to excavate the needs reparation excavates, and with being evenly distributed on behind the contaminated soil crushing and screening on the impervious barrier of place;
(2) according to early stage investigation result that contaminated soil is carried out anticipation is disconnected, anticipation result and corresponding pre-treatment are following:
A) do not contain the heavy metal contamination of appraising at the current rate, then directly get into step (3);
(3) the pervasive stabilization agent of CCT01 is added directly to contaminated soil, and adds the water mixing and stirring, the CCT01 adding proportion accounts for the 3-15% of soil weight;
(4) fully mix after, sample detecting is carried out in maintenance 3-10 days, and detects the leaching toxicity of heavy metal in soil.The result is as shown in the table:
Embodiment 11:
A kind of method of use that is applicable to the stablizer of heavy-metal contaminated soil, step is following:
(1) Polluted area that utilizes machinery to excavate the needs reparation excavates, and with being evenly distributed on behind the contaminated soil crushing and screening on the impervious barrier of place;
(2) according to early stage investigation result that contaminated soil is carried out anticipation is disconnected, anticipation result and corresponding pre-treatment are following:
B) if contain the heavy metals that appraise at the current rate such as trivalent arsenic in the contaminated soil, CCT02 arsenic specific agent is added directly to contaminated soil, and adds the water mixing and stirring, the CCT02 adding proportion accounts for the 3-15% of soil weight, maintenance half a day;
(3) the pervasive stabilization agent of CCT01 is added directly to contaminated soil, and adds the water mixing and stirring, the CCT01 adding proportion accounts for the 3-20% of soil weight
(4) fully mix after, sample detecting is carried out in maintenance 3-10 days, and detects the leaching toxicity of heavy metal in soil.The result representes as follows:
Embodiment 12:
A kind of method of use that is applicable to the stablizer of heavy-metal contaminated soil, step is following:
(1) Polluted area that utilizes machinery to excavate the needs reparation excavates, and with being evenly distributed on behind the contaminated soil crushing and screening on the impervious barrier of place;
(2) according to early stage investigation result that contaminated soil is carried out anticipation is disconnected, anticipation result and corresponding pre-treatment are following:
B) if contain the heavy metals that appraise at the current rate such as trivalent arsenic in the contaminated soil, CCT02 arsenic specific agent is added directly to contaminated soil, and adds the water mixing and stirring, the CCT02 adding proportion accounts for the 3-15% of soil weight, maintenance half a day;
(3) the pervasive stabilization agent of CCT01 is added directly to contaminated soil, and adds the water mixing and stirring, the CCT01 adding proportion accounts for the 3-20% of soil weight
(4) fully mix after, sample detecting is carried out in maintenance 3-10 days, and detects the leaching toxicity of heavy metal in soil.The result representes as follows:
Embodiment 13:
A kind of method of use that is applicable to the stablizer of heavy-metal contaminated soil, step is following:
(1) Polluted area that utilizes machinery to excavate the needs reparation excavates, and with being evenly distributed on behind the contaminated soil crushing and screening on the impervious barrier of place;
(2) according to early stage investigation result that contaminated soil is carried out anticipation is disconnected, anticipation result and corresponding pre-treatment are following:
C) if contain the heavy metals that appraise at the current rate such as sexavalent chrome in the contaminated soil, CCT03 chromium specific agent is added directly to contaminated soil, and adds the water mixing and stirring, the CCT03 adding proportion accounts for soil weight 2-10%, maintenance half a day;
(3) the pervasive stabilization agent of CCT01 is added directly to contaminated soil, and adds the water mixing and stirring, the CCT01 adding proportion accounts for the 3-20% of soil weight
(4) fully mix after, sample detecting is carried out in maintenance 3-10 days, and detects the leaching toxicity of heavy metal in soil.The result representes as follows:
Embodiment 14:
A kind of method of use that is applicable to the stablizer of heavy-metal contaminated soil, step is following:
(1) Polluted area that utilizes machinery to excavate the needs reparation excavates, and with being evenly distributed on behind the contaminated soil crushing and screening on the impervious barrier of place;
(2) according to early stage investigation result that contaminated soil is carried out anticipation is disconnected, anticipation result and corresponding pre-treatment are following:
C) if contain the heavy metals that appraise at the current rate such as sexavalent chrome in the contaminated soil, CCT03 chromium specific agent is added directly to contaminated soil, and adds the water mixing and stirring, the CCT03 adding proportion accounts for soil weight 2-10%, maintenance half a day;
(3) the pervasive stabilization agent of CCT01 is added directly to contaminated soil, and adds the water mixing and stirring, the CCT01 adding proportion accounts for the 3-20% of soil weight
(4) fully mix after, sample detecting is carried out in maintenance 3-10 days, and detects the leaching toxicity of heavy metal in soil.The result representes as follows:
Can find out, adopt technical scheme of the present invention after, the leaching concentration of heavy metal all reaches relevant standard, and embodiment is simple, be convenient to the operation.
Need to prove that the foregoing description only is a preferred embodiments of the present invention, be not used for limiting protection scope of the present invention, protection scope of the present invention is as the criterion with claims.
Claims (14)
1. a heavy metal contamination crystallization is sealed stabilization agent, is called for short CCT01, and 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%.
2. heavy metal contamination crystallization according to claim 1 is sealed stabilization agent; It is characterized in that: said gelling material is one or several in silicate cement or aluminate cement or the aluminosulfate cement, and said clay mineral is one or several in smectite or sepiolite or the illite.
3. seal stabilization agent according to claim 1 or 2 or 3 described heavy metal contamination crystallization; It is characterized in that: said 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%.
4. a heavy metal contamination crystallization is sealed stabilization agent, is called for short CCT02, and it is characterized in that: this stabilization agent is grouped into by the one-tenth of following mass ratio, and iron is salt 10-30%, oxygenant 30-50%, and clay mineral 30-60%, its raw material summation is 100%.
5. heavy metal contamination crystallization according to claim 4 is sealed stabilization agent, it is characterized in that: said oxygenant is manganese oxide or ydrogen peroxide 50 or calcium superoxide.
6. seal stabilization agent according to claim 4 or 5 described heavy metal contamination crystallization, it is characterized in that: said clay mineral is one or several in smectite or sepiolite or the illite.
7. seal stabilization agent according to claim 4 or 5 described heavy metal contamination crystallization; It is characterized in that: this stabilization agent is grouped into by the one-tenth of following mass ratio, and iron is salt 20-25%, oxygenant 35-45%; Clay mineral 35-50%, its raw material summation is 100%.
8. a heavy metal contamination crystallization is sealed stabilization agent, is called for short CCT03, and it is characterized in that: this stabilization agent is grouped into by the one-tenth of following mass ratio, and iron is salt 30-50%, polysulfide 15-30%, and clay mineral 30-60%, its raw material summation is 100%.
9. heavy metal contamination crystallization according to claim 8 is sealed stabilization agent, it is characterized in that: said clay mineral is one or several in smectite or sepiolite or the illite.
10. heavy metal contamination crystallization according to claim 8 is sealed stabilization agent; 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%.
11. a method of use that is applicable to the stablizer of heavy-metal contaminated soil is characterized in that: said method comprising the steps of:
(1) utilize mechanical means that the Polluted area of needs reparation is excavated, and with being evenly distributed on behind the contaminated soil crushing and screening on the impervious barrier of place;
(2) according to early stage investigation result that contaminated soil is carried out anticipation is disconnected, anticipation result and corresponding pre-treatment are following:
A) if do not contain the heavy metal contamination of appraising at the current rate, then directly get into step (3);
B) if contain the heavy metals that appraise at the current rate such as trivalent arsenic in the contaminated soil, CCT02 arsenic specific agent is added directly to contaminated soil, and adds the water mixing and stirring, the CCT02 adding proportion accounts for the 2-15% of soil weight, maintenance half a day;
C) if contain the heavy metals that appraise at the current rate such as sexavalent chrome in the contaminated soil, CCT03 chromium specific agent is added directly to contaminated soil, and adds the water mixing and stirring, the CCT03 adding proportion accounts for soil weight 2-10%, maintenance half a day;
(3) the pervasive stabilization agent of CCT01 is added directly to contaminated soil, and adds the water mixing and stirring, the CCT01 adding proportion accounts for the 3-20% of soil weight;
(4) fully mix after, sample detecting is carried out in maintenance 3-10 days, and detects the leaching toxicity of heavy metal in soil.
12. the method for use of stablizer according to claim 11 is characterized in that: the step B in the said step (2)), the CCT02 adding proportion accounts for the 3-10% of soil weight.
13. the method for use of stablizer according to claim 11 is characterized in that: the step C in the said step (2)), the CCT03 adding proportion accounts for the 3-8% of soil weight.
14. the method for use of stablizer according to claim 11 is characterized in that: the CCT01 adding proportion accounts for the 5-15% of soil weight in the said step (3).
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