CN117358745A - Risk management and control method for metal-like contaminated soil - Google Patents
Risk management and control method for metal-like contaminated soil Download PDFInfo
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- CN117358745A CN117358745A CN202311363905.0A CN202311363905A CN117358745A CN 117358745 A CN117358745 A CN 117358745A CN 202311363905 A CN202311363905 A CN 202311363905A CN 117358745 A CN117358745 A CN 117358745A
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- polluted soil
- soil
- powder
- honeycomb
- iron
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- 239000002689 soil Substances 0.000 title claims abstract description 208
- 238000000034 method Methods 0.000 title claims abstract description 54
- 239000000843 powder Substances 0.000 claims abstract description 90
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 70
- -1 polysiloxane Polymers 0.000 claims abstract description 44
- 230000001105 regulatory effect Effects 0.000 claims abstract description 36
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 25
- 238000003756 stirring Methods 0.000 claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 68
- 239000002699 waste material Substances 0.000 claims description 61
- 239000002253 acid Substances 0.000 claims description 42
- 229910052742 iron Inorganic materials 0.000 claims description 41
- 239000002440 industrial waste Substances 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 25
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 23
- 229910052782 aluminium Inorganic materials 0.000 claims description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 239000011083 cement mortar Substances 0.000 claims description 19
- 239000004927 clay Substances 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 14
- 238000000227 grinding Methods 0.000 claims description 13
- 238000010276 construction Methods 0.000 claims description 12
- 239000011449 brick Substances 0.000 claims description 11
- 239000000834 fixative Substances 0.000 claims description 10
- 238000007873 sieving Methods 0.000 claims description 10
- 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
- 230000004913 activation Effects 0.000 claims description 8
- 239000011451 fired brick Substances 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 229910052787 antimony Inorganic materials 0.000 claims description 5
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 5
- 229910052732 germanium Inorganic materials 0.000 claims description 4
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052714 tellurium Inorganic materials 0.000 claims description 4
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 238000007726 management method Methods 0.000 description 32
- 230000000052 comparative effect Effects 0.000 description 30
- 238000012360 testing method Methods 0.000 description 28
- 238000002386 leaching Methods 0.000 description 22
- 230000000694 effects Effects 0.000 description 15
- 239000011148 porous material Substances 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 8
- 239000002734 clay mineral Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000001179 sorption measurement Methods 0.000 description 7
- 230000001988 toxicity Effects 0.000 description 7
- 231100000419 toxicity Toxicity 0.000 description 7
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 6
- 229910001424 calcium ion Inorganic materials 0.000 description 6
- 239000004568 cement Substances 0.000 description 6
- 230000002209 hydrophobic effect Effects 0.000 description 6
- 230000002706 hydrostatic effect Effects 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- 229910052752 metalloid Inorganic materials 0.000 description 6
- 150000002738 metalloids Chemical class 0.000 description 5
- 239000000575 pesticide Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000000378 calcium silicate Substances 0.000 description 4
- 229910052918 calcium silicate Inorganic materials 0.000 description 4
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 239000004408 titanium dioxide Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000003673 groundwater Substances 0.000 description 3
- 210000001595 mastoid Anatomy 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000005442 atmospheric precipitation Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 150000005837 radical ions Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- DJHGAFSJWGLOIV-UHFFFAOYSA-K Arsenate3- Chemical compound [O-][As]([O-])([O-])=O DJHGAFSJWGLOIV-UHFFFAOYSA-K 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RMBBSOLAGVEUSI-UHFFFAOYSA-H Calcium arsenate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-][As]([O-])([O-])=O.[O-][As]([O-])([O-])=O RMBBSOLAGVEUSI-UHFFFAOYSA-H 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- CQBLUJRVOKGWCF-UHFFFAOYSA-N [O].[AlH3] Chemical compound [O].[AlH3] CQBLUJRVOKGWCF-UHFFFAOYSA-N 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 229940000489 arsenate Drugs 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229940103357 calcium arsenate Drugs 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical group O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- RECVMTHOQWMYFX-UHFFFAOYSA-N oxygen(1+) dihydride Chemical compound [OH2+] RECVMTHOQWMYFX-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000012954 risk control Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a risk management and control method for metal-like polluted soil, which can meet the green low-carbon treatment requirement on the metal-like polluted soil. The method comprises the following steps: step 10, adding a fixing agent into the polluted soil to be treated, and stirring; step 20, adding a regulating agent into the polluted soil prepared in the step 10, and stirring; the regulator comprises polysiloxane and honeycomb powder.
Description
Technical Field
The invention belongs to the technical field of polluted site restoration, and particularly relates to a risk management and control method for metal-like polluted soil.
Background
The in-situ safe utilization of polluted soil is an important content of green low-carbon risk management and control of polluted sites. Compared with the conventional positive metal ion contaminated soil, the metal elements such as germanium, arsenic, antimony, tellurium and the like are usually in the form of oxygen-containing radicals in the form of anions in the soil or groundwater, and the mobility and the biotoxicity of the metal elements are obviously higher than those of the ion metal elements. At present, commonly used materials such as cement, lime and the like solidify and stabilize or stabilize the polluted soil, and then the polluted soil treated by the materials is extremely easy to redissolve under the action of groundwater erosion or atmospheric precipitation leaching, thereby threatening the surrounding water environment and aquatic organisms. There is a need to develop new methods for treating metalloid contaminated soil to facilitate risk management and safe reuse in similarly contaminated sites.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a risk management and control method for metal-like polluted soil so as to realize the green low-carbon treatment requirement on the metal-like polluted soil.
In order to solve the technical problems, the invention adopts the following technical scheme:
a risk management method for metal-like contaminated soil, the contaminated soil containing a contaminating element, the treatment method comprising:
step 10, adding a fixing agent into the polluted soil to be treated, and stirring;
step 20, adding a regulating agent into the polluted soil prepared in the step 10, and stirring; the regulator comprises polysiloxane and honeycomb powder.
Preferably, the pollution element is at least one of germanium, arsenic, antimony and tellurium.
Preferably, the fixing agent comprises activated building demolition waste powder and polyaluminosilicate iron.
Preferably, in the polyaluminum ferric silicate, the mass content of aluminum and the mass content of iron are calculated by oxide, and the mass content of aluminum is 20% -35% and the mass content of iron is 15% -30%.
Preferably, the honeycomb powder is powder particles obtained by grinding honeycomb and sieving the ground honeycomb with a 200-500-mesh sieve.
Preferably, in the fixing agent, the mass ratio of the activated building demolition waste powder to the polyaluminium ferric silicate is 1-25:5; in the regulator, the mass ratio of polysiloxane to honeycomb powder is 100-10:1.
Preferably, the preparation method of the activated building demolition waste powder comprises the following steps:
step 11, screening building demolition waste, namely hardening cement mortar and clay fired bricks;
step 12, mixing hardened cement mortar and bricks fired by clay according to the mass ratio of 1-6:2, grinding, sieving with a 150-200 mesh sieve, and drying in an air atmosphere at 80-105 ℃ to obtain mixed fine powder;
step 13, carrying out activation treatment on the mixed fine powder prepared in the step 12 by using industrial waste acid; the activation treatment process comprises the following steps: mixing the industrial waste acid and the mixed fine powder according to the volume to mass ratio of 5-20:1, standing for 0.5-3 hours, and then drying in an air atmosphere at 80-105 ℃ to obtain the activated building demolition waste powder.
Preferably, the industrial waste acid is industrial waste acid containing free iron ions, the pH value of the industrial waste acid is 3-5.5, and the iron ion content is 300-3500 mg/L.
Preferably, the step 10 includes:
step 101, adjusting the water content of the polluted soil to be treated to 15-35%;
102, uniformly mixing the adjusted polluted soil with a fixing agent, wherein the mass of the fixing agent accounts for 1-15% of that of the soil, and curing for 3-28 days to obtain first-stage treated polluted soil;
and 103, adjusting the water content of the first-stage treated polluted soil to be below 5%, and crushing the first-stage treated polluted soil to be below 5mm in particle size to obtain second-stage treated polluted soil.
Preferably, the step 20 includes:
uniformly spraying a regulating agent on the surface of the polluted soil treated by the second stage, and uniformly stirring; the mass of the regulating agent accounts for 1-5% of the mass of the soil.
The beneficial effects are that: compared with the prior art, the invention has the following beneficial effects: the risk management and control method can meet the green low-carbon treatment requirement on the soil polluted by the metalloid. The processing method comprises the following steps: step 10, adding a fixing agent into the polluted soil to be treated, and stirring; step 20, adding a regulating agent into the polluted soil prepared in the step 10, and stirring; the regulator comprises polysiloxane and honeycomb powder. The treatment method can remarkably improve the leaching toxicity and water sensitivity of the polluted soil. The method is suitable for controlling the risk of the polluted soil in water sensitive areas or areas and safely utilizing the polluted soil.
Detailed Description
The following describes the technical scheme of the invention in detail. The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials, unless otherwise specified, are commercially available.
According to the risk management and control method for the metal-like polluted soil, disclosed by the embodiment of the invention, a treatment object is in the soil containing the polluted elements. The pollution element is at least one of germanium, arsenic, antimony and tellurium. Soil containing these contaminating elements is referred to as metalloid contaminated soil.
The risk management and control method comprises the following steps:
and 10, adding a fixing agent into the polluted soil to be treated, and stirring. Preferably, the fixative comprises activated construction demolition waste powder and polyaluminosilicate iron.
The fixative is added into the polluted soil, and mainly the following reactions occur: (1) Activated construction demolition waste powder and polyaluminosilicate are rapidly dissolved in contaminated soil pore water to produce a large amount of positive ions in a dissolved state, such as calcium ions, iron ions and the like, which form insoluble precipitates, such as calcium arsenate, with the presence of contaminating elements (such as arsenate) in the soil pore water as negative ions; (2) The waste acid activates porous cement mortar and clay minerals in the construction demolition waste powder to be pollution elements in negative ion state, and insoluble sediments provide a large number of adsorption points and deposition interfaces; (3) Silicate ions generated by hydrolyzing polymeric aluminum ferric silicate and calcium ions in pore water generate a large amount of gelatinous hydrated calcium silicate, and insoluble precipitates containing pollution elements are subjected to reinforcement package, so that the diffusion and migration processes of the pollution elements are effectively reduced.
Preferably, the preparation method of the activated building demolition waste powder comprises the following steps:
and 11, screening building demolition waste, wherein the building demolition waste is divided into hardened cement mortar and clay fired bricks. The main component of the hardened cement mortar is hardened calcium silicate, and the main component of the clay-fired brick is aluminum oxide and silicon dioxide. The construction demolition waste is divided into two components of hardened cement mortar and bricks fired by clay, which is favorable for quantitatively adjusting and repairing free calcium ions (hardened calcium silicate from waste acid treatment), activated alumina and silicon dioxide (bricks fired by clay) in a polluted soil system, accurately adjusting and repairing the mass ratio of elements such as calcium, silicon, aluminum and the like in the polluted soil, generating hydrated calcium silicate and hydrated calcium aluminate with better compactness, and promoting the adsorption and encapsulation of the polluted elements.
And step 12, mixing the hardened cement mortar and the brick burned by clay according to the mass ratio of 1-6:2, grinding, sieving with a 150-200 mesh sieve, and drying in an air atmosphere at 80-105 ℃ to obtain mixed fine powder.
Step 13, carrying out activation treatment on the mixed fine powder prepared in the step 12 by using industrial waste acid; the activation treatment process comprises the following steps: mixing the industrial waste acid and the mixed fine powder according to the volume to mass ratio of 20-5:1, standing for 0.5-3 hours, and then drying in an air atmosphere at 80-105 ℃ to obtain the activated building demolition waste powder. Preferably, the industrial waste acid is industrial waste acid containing free iron ions, the pH value of the industrial waste acid is 3-5.5, and the iron ion content is 300-3500 mg/L. The industrial waste acid can be waste acid containing free iron ions generated in the fine processing industry of steel and the production industry of titanium dioxide.
Mixing the mixed fine powder and the industrial waste acid according to the volume to mass ratio of 20-5:1, and dissolving calcium oxide and calcium hydroxide in hardened cement mortar in the mixed fine powder in an acid solution to generate soluble calcium ions; the colloidal silicic acid produced is adsorbed and agglomerated with iron ions in the solution. On the other hand, in the acid solution, the brick powder fired by clay dissolves silicon oxygen tetrahedrons and aluminum oxygen octahedrons at crystal fracture and incomplete parts in clay minerals, so that the lattice mobility is increased, the cation exchange capacity of the clay minerals is obviously increased, part of water molecules and iron ions are diffused into the space between the lattices, and the iron ions replace sodium ions and potassium ions on the surface between the space between the lattices, so that positive charges are enhanced, and the special adsorption of the clay minerals to anionic elements is facilitated. In the standing process, as the reaction proceeds, the solution hydrogen ions are reacted completely, and the solution gradually tends to be neutral or weak alkaline. In the reaction process, calcium oxide and calcium hydroxide in the hardened cement mortar are rapidly dissolved, so that the pores of the hardened cement mortar powder are obviously developed, the surface area is increased by approximately 1000 times, and the strong specific surface energy promotes the adsorption stability of pollution elements. Finally, drying in the air atmosphere at 80-105 ℃. The temperature range can ensure that free calcium ions are crystallized and precipitated in the form of calcium chloride and calcium sulfate on the premise of finishing the rapid evaporation of water in the solution, and react with carbon dioxide in the air to generate a carbonized layer on the surface. In addition, under the conditions of the drying atmosphere and the temperature, water molecules among clay mineral lattices cannot volatilize, and meanwhile, iron ions are slightly oxidized, so that the interlayer spacing of clay minerals is further increased. Conversely, when the temperature is too high or too low, the water ion evaporation or iron ion oxidation reaction is weak, the interval development of silica and alumina crystal layers of clay minerals is not obvious, and the activation effect of the construction demolition waste powder can be obviously reduced.
Preferably, in the polyaluminum ferric silicate, the mass content of aluminum and the mass content of iron are calculated by oxide, and the mass content of aluminum is 20% -35% and the mass content of iron is 15% -30%. Preferably, in the fixing agent, the mass ratio of the activated building demolition waste powder to the polyaluminium ferric silicate is 1-25:5. In order to realize the full utilization of active elements of activated building demolition waste powder and polyaluminium silicate iron in a reaction system, namely, the added elements completely react with metalloid anions in a precipitation way, gel substances are generated to adsorb pollution elements to be saturated, the contents of aluminum and iron in the polyaluminium silicate iron and the mass ratio of the activated building demolition waste powder to the polyaluminium silicate iron are controlled within the range.
And step 20, adding a regulating agent into the polluted soil prepared in the step 10, and stirring. The regulator comprises polysiloxane and honeycomb powder. Preferably, the honeycomb powder is powder particles obtained by grinding honeycomb and sieving the ground honeycomb with a 200-500-mesh sieve.
Preferably, in the regulator, the mass ratio of the polysiloxane to the honeycomb powder is 100-10:1.
In step 20, the specific surface area energy of the microscopic interfaces of the restored soil particles is changed through polysiloxane and honeycomb powder, so that the hydrophobic property of clay particles is increased, and the aim of macroscopically regulating and restoring the water sensitivity of polluted soil is fulfilled. Specifically, after the compound regulator containing liquid polysiloxane and solid honeycomb powder is mixed with the polluted soil restoration, the following physical and chemical reaction process mainly occurs: (1) Uniformly mixing polysiloxane and honeycomb powder with polluted soil, wherein the surfaces of the polysiloxane and the components such as silicon dioxide and silicate of the polluted soil are tightly combined through a silicon-oxygen bond, and a mastoid structure on the surface of lotus leaf is generated on the surface of soil particles by adding the solid honeycomb powder with a hydrophobic effect, so that a strong hydrophobic interface is formed, the hydrophobicity of the polluted soil is obviously improved, and the pore water flowing and exchanging capacity of the polluted soil is reduced; (2) Under the condition of atmospheric precipitation or groundwater flow, the pollution elements in the polluted soil mainly migrate to the surrounding environment through pore water. If the hydrophobic property of the polluted soil is improved, the saturation degree of the polluted soil is reduced, and the permeability coefficient and the effective diffusion coefficient of the soil are obviously reduced, so that the process of restoring the pore water of the polluted soil and the water exchange of the surrounding environment is obviously inhibited.
Through a series of optimization tests, 200-500 mesh honeycomb powder is selected and mixed with polysiloxane in a mass ratio of 1:100-10, so that uniform dispersion of the honeycomb powder and the polysiloxane can be effectively realized, the surface microstructure of clay particles can be more effectively improved, more uniformly distributed mastoid structures are formed, and the excellent flow of pore water movement is reduced.
Preferably, the step 10 includes:
and 101, adjusting the water content of the polluted soil to be treated to 15-35%. The water content range can ensure that the main components are rapidly dissolved and hydration reaction is carried out after the fixing agent is added.
And 102, uniformly mixing the adjusted polluted soil with a fixing agent, wherein the mass of the fixing agent accounts for 1-15% of that of the soil, and curing for 3-28 days to obtain the first-stage treated polluted soil. After sufficient maintenance, the pollutant element is adsorbed and wrapped by silicate and aluminosilicate through precipitation reaction, special adsorption and other actions, so as to form a compact stable water-insoluble structure.
The contact area between the repaired polluted soil particles and the regulating agent can be reduced when the pore water of the polluted soil is too large, and larger dust is generated in the mixing process when the pore water is too small, so that the water content of the polluted soil in the first stage treatment is adjusted to be below 5%, and the polluted soil in the second stage treatment is obtained after the first stage treatment is crushed to be below 5mm in particle size in step 103. The water content range effectively improves the wrapping effect of the regulating agent on restoring polluted soil particles.
Preferably, the step 20 includes: uniformly spraying a regulating agent on the surface of the polluted soil treated by the second stage, and uniformly stirring; the mass of the regulating agent accounts for 1-5% of the mass of the soil.
The risk management and control method sequentially adds the fixing agent and the regulating agent in two steps. The method can generate high-density adsorption sites by utilizing a large amount of soluble calcium ions and iron ions of the activated building demolition waste powder and the specific surface area of the activated building demolition waste powder porous structure, and has extremely strong adsorption and precipitation effects on acid radical ions of metalloids.
In the application, the polyaluminum ferric silicate hydrolyzes to generate complex particle groups with positive charges and negative charges, and in pore water medium of soil, acid radical ions of metalloid form compact insoluble precipitate with the positive charge particle groups and the load particle groups through bridging. And (3) fully depositing and filling the serial precipitates generated in the step (102) in the activated building demolition waste powder porous structure in the process of repairing polluted soil to be dry (pore water evaporation), and obviously reducing the migration capacity of polluted ions in the soil.
In the application, the regulator containing polysiloxane and honeycomb powder forms a strong hydrophobic interface by generating a mastoid structure on the lotus leaf surface on the surface of soil particles, so that the pore water flowing and exchanging capacity of restoring polluted soil is remarkably reduced, and the migration of polluted metalloid ions in the polluted soil is remarkably inhibited.
One specific embodiment is exemplified below.
In the embodiment, the fixing agent consists of activated building demolition waste powder and polymeric aluminum ferric silicate, wherein the building demolition waste is waste hardened cement mortar and clay fired bricks generated by demolishing a brick-concrete structure, and the content of iron element in the polymeric aluminum ferric silicate is 36%.
The honeycomb powder is powder particles obtained by grinding honeycomb and sieving with a 300-mesh sieve.
The industrial waste acid is waste acid containing free iron ions and produced by the fine processing industry of steel, the pH value is 4.3, and the iron content is 300-3500 mg/L.
In the following examples or comparative examples, the content and the blending amount are mass contents unless otherwise specified.
Example 1 Metal-like contaminated soil Risk management method
Step 1, preparing a fixing agent, which comprises the following steps:
(1) Screening building demolition waste, namely hardening cement mortar and clay burned bricks;
(2) Mixing hardened cement mortar and clay burned bricks according to a mass ratio of 1:1, grinding, sieving with a 200-mesh sieve, and drying in an air atmosphere at 105 ℃ to obtain mixed fine powder;
(3) The mixed fine powder in the step (2) is activated by industrial waste acid, and the process is as follows: mixing the industrial waste acid and the mixed fine powder according to the proportion of 10:1 (volume: mass), standing for 3 hours, and then drying in an air atmosphere at 105 ℃ to obtain the activated building demolition waste powder. The industrial waste acid is taken from a water collecting tank of a titanium dioxide production enterprise, and is stored in the waste acid collecting tank for less than 3 days, wherein the pH value of the waste acid is 4.05, and the iron content is 3207mg/L.
(4) Mixing the activated building demolition waste powder and the polyaluminium ferric silicate in the step (3) according to the mass ratio of 20:5 to obtain the fixing agent.
Step 2, preparing a regulating agent, which comprises
(1) Drying honeycomb, grinding into 350 mesh sieve.
(2) Fully mixing the honeycomb powder and the liquid polysiloxane to obtain the regulator. The aluminum content in the polyaluminum ferric silicate is 25%, the iron content is 30%, and the aluminum content and the iron content are calculated by oxide. The mass ratio of polysiloxane to honeycomb powder was 50:1.
Step 3, treating the metal-like polluted soil
The polluted soil is taken from a dangerous waste workshop of a retired pesticide production enterprise, and the arsenic concentration in the soil is 352mg/kg. The processing process comprises the following steps:
(1) The water content of the polluted soil is regulated to 23%, the polluted soil and the fixing agent are uniformly mixed, the fixing agent accounts for 5% of the mass of the polluted soil, and the polluted soil is cured for 7 days, so that the first-stage treatment polluted soil is obtained.
(2) Reducing the water content of the first-stage treated polluted soil to 3%, and crushing the first-stage treated polluted soil until the particle size is smaller than 4mm to obtain the second-stage treated polluted soil.
(3) Uniformly spraying the regulating agent on the surface of the second-stage treated polluted soil particles, and uniformly stirring. The regulating agent accounts for 5% of the mass ratio of the soil.
Example 2 Risk management method for Metal-like contaminated soil
The polluted soil is taken from a retired polluted site, and the soil pollution element is antimony with the concentration of 117mg/kg. The rest of the procedure is the same as in example 1.
Example 3 Risk management method for Metal-like contaminated soil
Step 1, preparing a fixing agent, which comprises the following steps:
(1) Screening building demolition waste, namely hardening cement mortar and clay burned bricks;
(2) Mixing hardened cement mortar and clay-fired bricks according to a mass ratio of 3:1, grinding, sieving with a 150-mesh sieve, and drying in an air atmosphere at 80 ℃ to obtain mixed fine powder;
(3) The mixed fine powder in the step (2) is activated by industrial waste acid, and the process is as follows: mixing the industrial waste acid and the mixed fine powder according to the proportion of 5:1 (volume: mass), standing for 2 hours, and then drying in an air atmosphere at 90 ℃ to obtain the activated building demolition waste powder. The industrial waste acid is taken from a water collecting tank of a titanium dioxide production enterprise, and is stored in the waste acid collecting tank for less than 3 days, wherein the pH value of the waste acid is 5.5, and the iron content is 300mg/L.
(4) Mixing the activated building demolition waste powder and the polyaluminium ferric silicate in the step (3) according to the mass ratio of 1:5 to obtain the fixing agent.
Step 2, preparing a regulating agent, which comprises
(1) Drying honeycomb, grinding into 200 mesh sieve.
(2) Fully mixing the honeycomb powder and the liquid polysiloxane to obtain the regulator. The aluminum content in the polyaluminum ferric silicate is 20%, the iron content is 15%, and the aluminum content and the iron content are calculated by oxide. The mass ratio of polysiloxane to honeycomb powder is 10:1.
Step 3, treating the metal-like polluted soil
The polluted soil is taken from a dangerous waste workshop of a retired pesticide production enterprise, and the arsenic concentration in the soil is 352mg/kg. The processing process comprises the following steps:
(1) The water content of the polluted soil is regulated to 15%, the polluted soil and the fixing agent are uniformly mixed, the fixing agent accounts for 15% of the mass of the polluted soil, and the polluted soil is cured for 28 days, so that the first-stage treatment polluted soil is obtained.
(2) Reducing the water content of the first-stage treated polluted soil to 5%, and crushing the polluted soil until the particle size is smaller than 3mm to obtain the second-stage treated polluted soil.
(3) Uniformly spraying the regulating agent on the surface of the second-stage treated polluted soil particles, and uniformly stirring. The mass ratio of the regulating agent to the soil is 3%.
Example 4 Risk management method for Metal-like contaminated soil
Step 1, preparing a fixing agent, which comprises the following steps:
(1) Screening building demolition waste, namely hardening cement mortar and clay burned bricks;
(2) Mixing hardened cement mortar and clay burned bricks according to the mass ratio of 1:2, grinding, sieving with a 180-mesh sieve, and drying in an air atmosphere at 95 ℃ to obtain mixed fine powder;
(3) The mixed fine powder in the step (2) is activated by industrial waste acid, and the process is as follows: mixing the industrial waste acid and the mixed fine powder according to the proportion of 20:1 (volume: mass), standing for 0.5 hour, and then drying in an air atmosphere at 80 ℃ to obtain the activated building demolition waste powder. The industrial waste acid is taken from a water collecting tank of a titanium dioxide production enterprise, and is stored in the waste acid collecting tank for less than 3 days, wherein the pH value of the waste acid is 3, and the iron content of the waste acid is 3500mg/L.
(4) Mixing the activated building demolition waste powder and the polyaluminium ferric silicate in the step (3) according to the mass ratio of 5:1 to obtain the fixing agent.
Step 2, preparing a regulating agent, which comprises
(1) Drying honeycomb, grinding into 500 mesh sieve.
(2) Fully mixing the honeycomb powder and the liquid polysiloxane to obtain the regulator. The aluminum content in the polyaluminum ferric silicate is 35%, the iron content is 20%, and the aluminum content and the iron content are calculated by oxide. The mass ratio of polysiloxane to honeycomb powder is 100:1.
Step 3, treating the metal-like polluted soil
The polluted soil is taken from a dangerous waste workshop of a retired pesticide production enterprise, and the arsenic concentration in the soil is 352mg/kg. The processing process comprises the following steps:
(1) The water content of the polluted soil is regulated to 35%, the polluted soil and the fixing agent are uniformly mixed, the fixing agent accounts for 1% of the mass of the polluted soil, and the polluted soil is cured for 3 days, so that the first-stage treatment polluted soil is obtained.
(2) Reducing the water content of the first-stage treated polluted soil to 4%, and crushing the first-stage treated polluted soil until the particle size is smaller than 5mm to obtain the second-stage treated polluted soil.
(3) Uniformly spraying the regulating agent on the surface of the second-stage treated polluted soil particles, and uniformly stirring. The mass ratio of the regulating agent to the soil is 1%.
Comparative example 1
No fixative was added to the contaminated soil and the rest of the procedure was the same as in example 1.
Comparative example 2
The fixing agent is not added with activated building demolition waste powder, only polymeric aluminum ferric silicate is adopted, and the rest steps are the same as those of the example 1.
Comparative example 3
The fixing agent is not added with polyaluminum ferric silicate, only activated building demolition waste powder is adopted, and the rest steps are the same as those of the example 1.
Comparative example 4
The construction demolition waste powder in the fixing agent is not subjected to activation treatment, namely the step (3) in the step 1 is omitted, and the rest steps are the same as those in the example 1.
Comparative example 5
No regulator was added to the contaminated soil, and the rest of the procedure was the same as in example 1.
Comparative example 6
No honeycomb powder was added to the conditioner, and the rest of the procedure was the same as in example 1.
Comparative example 7
Polysiloxane was not added to the conditioner, and the rest of the procedure was the same as in example 1.
Comparative example 8
In the steps of the fixing agent and regulating agent application method, the water content of the polluted soil before the fixing agent is added is adjusted to 10%, and the rest treatment and test steps are the same as those of the example 1.
Comparative example 9
In the steps of the fixing agent and regulating agent application method, the water content of the polluted soil before the fixing agent is added is adjusted to 40%, and the rest treatment and testing steps are the same as those of the example 1.
Comparative example 10
The water content of the contaminated soil of the first stage treatment was reduced to 10%, and the other steps were the same as in example 1.
Comparative example 11
Unlike example 1, this example replaces the fixative with the same amount of cement without the addition of a modulator.
The polluted soil is taken from a dangerous waste workshop of a retired pesticide production enterprise, and the arsenic concentration in the soil is 352mg/kg.
The water content of the polluted soil is regulated to 23%, the polluted soil and cement are uniformly mixed, the cement accounts for 5% of the mass of the polluted soil, and the polluted soil is maintained for 7 days, so that the risk management and control polluted soil is obtained.
Comparative example 12
Unlike example 1, this example replaces the fixative with the same amount of lime without the addition of a modulator.
The polluted soil is taken from a dangerous waste workshop of a retired pesticide production enterprise, and the arsenic concentration in the soil is 352mg/kg.
The water content of the polluted soil is regulated to 23%, the polluted soil and lime are uniformly mixed, cement accounts for 5% of the mass of the polluted soil, and the polluted soil is maintained for 7 days, so that the risk management and control polluted soil is obtained.
And carrying out toxicity leaching tests and semi-dynamic leaching tests on the polluted soil samples before and after risk management and control of the embodiment and the comparative example, and evaluating toxicity changes of the polluted soil before and after risk management and control. And carrying out a hydrophobic angle and hydrostatic water resistance test on the repaired soil sample, and evaluating the water sensitivity of the soil.
Toxicity leaching experiments were performed with reference to the standard "solid waste leaching toxicity leaching method sulfuric acid method" (HJ/T299-2007). For convenience of comparison, the leaching concentration of the pollution element is converted into the pollution element treatment rate (R r ) The calculation method is R r = (leaching concentration before treatment of contaminated soil element-leaching concentration after treatment of contaminated soil element)/leaching concentration before treatment of contaminated soil element x 100%. Toxicity leaching tests were performed on examples 1 to 4 and comparative examples 1 to 10, respectively, and the test results are shown in Table 1.
Semi-dynamic leaching tests were performed using the method of the U.S. environmental protection agency Mass transfer rates of constituents in monolithic or compacted granular materials using a semi-dynamic tank leaching procedure (US EPA 1315). Deionized water was used for the leaching solution in the test. Soil samples are taken out from leaching liquor after intervals of 2h, 23h, 5d, 7d, 14d, 7d and 14d respectively, and the percentage of the total leached mass to the polluted elements in the soil samples is calculated, namely the element leaching is reducedRate R e = (total amount of leaching solution before treatment of contaminated soil element-total amount of leaching solution contaminated element after treatment of contaminated soil element)/total amount of leaching solution contaminated element before treatment of contaminated soil element x 100%. Semi-dynamic leaching tests were performed on examples 1 to 4 and comparative examples 1 to 10, respectively, and the test results are shown in table 1.
Placing the soil samples before and after restoration into a cutting ring, flattening the surface, and keeping the density at 1.65g/cm 3 . Hydrophobicity test the contact angle of the restored soil with water was tested using a contact angle tester. For convenience of comparison, calculating the change rate R of the contact angle of soil and water α = (soil water contact angle after contaminated soil element treatment-soil water contact angle before contaminated soil element treatment)/soil water contact angle before contaminated soil element treatment x 100%. Contact angle tests were conducted on examples 1 to 4 and comparative examples 1 to 10 and 12, respectively, and the test results are shown in table 1.
The ring cutter filled with the soil sample was inserted into the lower side of the cylinder having the same outer diameter as the ring cutter, and the cylinder was placed vertically. And then, after the water quantity is increased step by step according to the depth in the device, the device is kept for 1 minute until the water leakage phenomenon occurs at the bottom of the sample, and the corresponding water column height is the hydrostatic resistance height of the sample. For convenience of comparison, the hydrostatic head height change rate R is calculated h = (hydrostatic resistance height after contaminated soil element treatment-hydrostatic resistance height before contaminated soil element treatment)/hydrostatic resistance height before contaminated soil element treatment x 100%. The hydrostatic resistance height test was conducted for each of examples 1 to 4 and comparative examples 1 to 10 and 12, and the test results are shown in Table 1.
Table 1 test results
As can be seen from table 1:
(1) The embodiments 1 to 4 show that the method for controlling the risk of the polluted soil has better risk control effect on different types of polluted soil; meanwhile, the pH value, the iron content, the activated building demolition waste powder and the polyaluminium ferric silicate of the industrial waste acid are changed according to the mass ratio, the mass ratio of polysiloxane to honeycomb powder, the water content of the polluted soil in the first-stage treatment and the mass ratio of the regulating agent to the soil in the range given by the invention, so that the expected pollution soil risk management and control effect can be ensured.
(2) In comparison with example 1, no fixative was added in comparative example 1. According to comparison test results, the fixing agent can remarkably improve the soil risk management and control effect of the application.
(3) In comparison with example 1, the fixative of comparative example 2 was not added with activated construction demolition waste powder. According to comparison test results, the risk management and control effect of the polluted soil can be remarkably improved by activating the building demolition waste powder.
(4) In contrast to example 1, the fixative in comparative example 3 was free of added polyaluminosilicate iron. Comparing test results shows that the polyaluminum ferric silicate can remarkably improve the risk management and control effect of the polluted soil.
(5) In comparison with example 1, the construction demolition waste powder in the fixative of comparative example 4 was not activated and was directly mixed with contaminated soil. According to comparison test results, after the construction demolition waste powder is activated, the risk management and control effect of the polluted soil can be remarkably improved.
(6) In contrast to example 1, no regulator was added in comparative example 5. The comparison test result shows that the regulating agent can obviously improve the contact angle of soil and water and the height of still water, and enhance the risk management and control effect of polluted soil.
(7) In contrast to example 1, no honeycomb powder was added to the conditioner of comparative example 6. According to comparison test results, the honeycomb powder can remarkably improve the risk management and control effect of polluted soil.
(8) In contrast to example 1, the regulator of comparative example 7 was free of polysiloxane addition. Comparison of test results shows that the polysiloxane can remarkably improve the risk management and control effect of polluted soil.
(9) Compared with example 1, the original water content of the polluted soil is adjusted to 10% in comparative example 8, the original water content of the polluted soil is adjusted to 40% in comparative example 9, when the water content of the polluted soil is low, the reaction of the fixing agent, pore water and clay minerals is insufficient, and when the water content of the polluted soil is high, a large amount of pore water remains, the soil porosity is increased, and the dissolution of the polluted elements from the soil matrix after management and control can be promoted. The comparison test result shows that the proper water content of the polluted soil can obviously improve the risk management and control effect of the polluted soil.
(10) Compared with example 1, in comparative example 10, the water content of the polluted soil is adjusted to 10%, and when the water content of the polluted soil in the first-stage treatment is higher, the contact area of the regulating agent and soil particles is reduced sharply, so that the regulating effect on the soil is reduced. As shown by comparison of test results, the proper water content of the first-stage treated polluted soil can obviously improve the risk management and control effect of the polluted soil.
(11) Compared with the example 1, the comparative example 11 and the comparative example 12 respectively replace the fixing agent with cement and lime with the same content, and the comparison test result shows that compared with the conventional treatment materials, the invention can obviously improve the risk management effect of polluted soil by combining the fixing agent and the regulating agent.
In conclusion, the risk management and control method can remarkably improve the leaching toxicity and water sensitivity of the polluted soil, and is suitable for the risk management and control of the polluted soil in water sensitive areas or areas and the safety utilization of the polluted soil.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the specific embodiments described above, and that the above specific embodiments and descriptions are provided for further illustration of the principles of the present invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for risk management of metal-like contaminated soil, wherein the contaminated soil contains a contaminating element, the method comprising:
step 10, adding a fixing agent into the polluted soil to be treated, and stirring;
step 20, adding a regulating agent into the polluted soil prepared in the step 10, and stirring; the regulator comprises polysiloxane and honeycomb powder.
2. The method of claim 1, wherein the contaminating element is at least one of germanium, arsenic, antimony, tellurium.
3. The method of claim 1, wherein the fixative comprises activated construction demolition waste powder and polyaluminosilicate iron.
4. The method according to claim 1, wherein the polymeric aluminum ferric silicate has an aluminum content of 20 to 35% and an iron content of 15 to 30% in terms of aluminum and iron content as oxides.
5. The method according to claim 1, wherein the honeycomb powder is a powder obtained by grinding honeycomb and sieving the ground honeycomb with a 200-500 mesh sieve.
6. A method according to claim 3, wherein the mass ratio of activated construction demolition waste powder to polyaluminosilicate iron in the fixing agent is 1-25:5; in the regulator, the mass ratio of polysiloxane to honeycomb powder is 100-10:1.
7. The method of claim 1, wherein the method of preparing activated construction demolition waste powder comprises:
step 11, screening building demolition waste, namely hardening cement mortar and clay fired bricks;
step 12, mixing hardened cement mortar and bricks fired by clay according to the mass ratio of 1-6:2, grinding, sieving with a 150-200 mesh sieve, and drying in an air atmosphere at 80-105 ℃ to obtain mixed fine powder;
step 13, carrying out activation treatment on the mixed fine powder prepared in the step 12 by using industrial waste acid; the activation treatment process comprises the following steps: mixing the industrial waste acid and the mixed fine powder according to the volume to mass ratio of 5-20:1, standing for 0.5-3 hours, and then drying in an air atmosphere at 80-105 ℃ to obtain the activated building demolition waste powder.
8. The method according to claim 7, wherein the industrial waste acid is industrial waste acid containing free iron ions, the pH value of the industrial waste acid is 3-5.5, and the iron ion content is 300-3500 mg/L.
9. The method according to claim 1, wherein said step 10 comprises:
step 101, adjusting the water content of the polluted soil to be treated to 15-35%;
102, uniformly mixing the adjusted polluted soil with a fixing agent, wherein the mass of the fixing agent accounts for 1-15% of that of the soil, and curing for 3-28 days to obtain first-stage treated polluted soil;
and 103, adjusting the water content of the first-stage treated polluted soil to be below 5%, and crushing the first-stage treated polluted soil to be below 5mm in particle size to obtain second-stage treated polluted soil.
10. The method according to claim 9, wherein said step 20 comprises:
uniformly spraying a regulating agent on the surface of the polluted soil treated by the second stage, and uniformly stirring; the mass of the regulating agent accounts for 1-5% of the mass of the soil.
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