CN115228925B - Stabilizer for restoring soil heavy metal composite pollution and preparation and application thereof - Google Patents
Stabilizer for restoring soil heavy metal composite pollution and preparation and application thereof Download PDFInfo
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- CN115228925B CN115228925B CN202210881330.0A CN202210881330A CN115228925B CN 115228925 B CN115228925 B CN 115228925B CN 202210881330 A CN202210881330 A CN 202210881330A CN 115228925 B CN115228925 B CN 115228925B
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- 239000002689 soil Substances 0.000 title claims abstract description 80
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 64
- 239000003381 stabilizer Substances 0.000 title claims abstract description 53
- 239000002905 metal composite material Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title abstract description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 66
- 244000005700 microbiome Species 0.000 claims abstract description 31
- 239000002367 phosphate rock Substances 0.000 claims abstract description 29
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 18
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 17
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 17
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 17
- 239000011651 chromium Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000010802 sludge Substances 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 7
- 235000014469 Bacillus subtilis Nutrition 0.000 claims description 22
- 239000010452 phosphate Substances 0.000 claims description 18
- 229910019142 PO4 Inorganic materials 0.000 claims description 17
- 239000003415 peat Substances 0.000 claims description 17
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 15
- 239000010865 sewage Substances 0.000 claims description 14
- 244000063299 Bacillus subtilis Species 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- 230000003381 solubilizing effect Effects 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 229910000155 iron(II) phosphate Inorganic materials 0.000 claims description 8
- 241000194103 Bacillus pumilus Species 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 4
- 241000194107 Bacillus megaterium Species 0.000 claims description 4
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 229940077441 fluorapatite Drugs 0.000 claims description 2
- 229910052587 fluorapatite Inorganic materials 0.000 claims description 2
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 claims description 2
- 241000149420 Bothrometopus brevis Species 0.000 claims 1
- 239000000428 dust Substances 0.000 claims 1
- 239000003814 drug Substances 0.000 abstract description 8
- 230000000087 stabilizing effect Effects 0.000 abstract description 8
- 239000003583 soil stabilizing agent Substances 0.000 abstract description 5
- 238000003900 soil pollution Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 14
- 150000002500 ions Chemical class 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 8
- SDEKDNPYZOERBP-UHFFFAOYSA-H iron(ii) phosphate Chemical compound [Fe+2].[Fe+2].[Fe+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O SDEKDNPYZOERBP-UHFFFAOYSA-H 0.000 description 7
- 238000001179 sorption measurement Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910000389 calcium phosphate Inorganic materials 0.000 description 2
- 239000001506 calcium phosphate Substances 0.000 description 2
- 235000011010 calcium phosphates Nutrition 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 210000000170 cell membrane Anatomy 0.000 description 2
- 210000003850 cellular structure Anatomy 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000857 drug effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 231100000783 metal toxicity Toxicity 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000002068 microbial inoculum Substances 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 238000000918 plasma mass spectrometry Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002688 soil aggregate Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 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
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mycology (AREA)
- Biotechnology (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Botany (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a stabilizer for restoring heavy metal composite pollution of soil, and preparation and application thereof. The raw material comprises the following components in percentage by mass: 52-60% of red mud, 30-35% of ground phosphate rock, 2-4% of sludge carbon, 5-8% of ferrous oxide and 1-2% of phosphate-dissolving microorganism. The stabilizer is applied to polluted soil, has the advantages of simple steps, low cost of medicament components contained in the stabilizer, no secondary pollution, strong practicability, remarkable stabilizing effect of the soil stabilizer, high service efficiency and long stabilizing time. After the composition is applied to the polluted soil, the pollution of heavy metals such as cadmium, lead, arsenic and chromium can be obviously reduced, and the stability of the cadmium, lead, arsenic and chromium in the soil can be ensured for a long time. Meanwhile, the method can also improve the utilization efficiency of the soil and the physicochemical property of the soil, and provides a novel high-efficiency method for the soil pollution treatment of the combined pollution containing cadmium, lead, arsenic and chromium.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a stabilizer for repairing heavy metal composite pollution such as cadmium, lead, arsenic, chromium and the like in soil, and preparation and application thereof.
Background
With the rapid development of industry and agriculture in China, the problems of heavy metal pollution caused by mining, smelting, pesticide, fertilizer application and other actions are more and more serious, and heavy metals have the characteristics of concealment, nondegradability, carcinogenicity and the like, can be accumulated in organisms through water, soil, food chains and other ways, influence the safety of agricultural products, and further harm the health of human beings. The mining and smelting activities of the metal mine enable the ore buried underground to be exposed to the ground surface, so that the release of heavy metal elements in the ore to the environment is possible, the heavy metal elements in the ore and surrounding rock enter surface water bodies, underground water bodies, atmosphere and soil in the mining area and surrounding areas in the forms of waste water, waste residue, waste gas and the like, serious heavy metal pollution is caused to local or surrounding ecological systems, the heavy metal elements enter a human food chain through an aquatic system, a soil-plant system and the like, and finally the human health is endangered, so that the repairing work is more complex and difficult. Therefore, it is important to find a stabilizer with relatively low cost and remarkable effect.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a stabilizer for repairing heavy metal composite pollution such as cadmium, lead, arsenic, chromium and the like in soil and application thereof. The stabilizer is simple in application to the polluted soil restoration step, low in cost of the contained medicament components, free of secondary pollution and high in practicability. The soil stabilizer has obvious stabilizing effect, high service efficiency and long stabilizing time, can obviously reduce the pollution of heavy metals such as cadmium, lead, arsenic and chromium after being applied to the polluted soil, and can ensure the stability of the cadmium, lead, arsenic and chromium in the soil for a long time. Meanwhile, the utilization efficiency of the soil can be improved, the physicochemical property of the soil is improved, and a novel high-efficiency method is provided for the soil pollution treatment of the combined pollution containing cadmium, lead, arsenic and chromium.
A stabilizer for restoring heavy metal composite pollution of soil comprises the following raw materials in parts by weight: red mud, ground phosphate rock, sewage peat, ferrous oxide and phosphate-dissolving microorganism.
The stabilizing agent for restoring the heavy metal composite pollution of the soil comprises the following raw material components in percentage by mass: 52-60% of red mud, 30-35% of ground phosphate rock, 2-4% of sludge carbon, 5-8% of ferrous oxide and 1-2% of phosphate-dissolving microorganism. Further, the stabilizing agent for restoring the heavy metal composite pollution of the soil comprises the following raw material components in percentage by mass: 60% of red mud, 30% of phosphate rock powder, 2% of sewage peat, 6% of ferrous oxide and 2% of phosphate-dissolving microorganism.
The main component of the red mud is CaO and Al 2 O 3 -SiO 2 The main components of the red mud material include aluminum and silicon which form active components, and meanwhile, the red mud material has large specific surface area and large surface energy, so that the red mud material can efficiently stabilize polluted soil.
The main component of the phosphorite powder is fluorapatite Ca 5 (PO4) 3 F, the purity is more than or equal to 60 percent. The phosphorite powder can be absorbedThe heavy metal ions in the precipitation part can be changed, the occurrence form and distribution of the heavy metal in the soil can be changed, a certain nutrition can be provided for the soil, and the plant growth can be promoted.
The sewage is activated sludge, has an adsorption effect on heavy metals, and has the best adsorption effect and the lowest energy consumption ratio after being treated at the high temperature of 400-800 ℃.
The phosphate solubilizing microorganism comprises: at least one of Bacillus megaterium (B.megaterium), bacillus subtilis (B.subtilis), bacillus pumilus (B.pumilis), and Bacillus pumilus (B.BRE VI S) of the genus Bacillus (BACILLUS); biomass 10 8- 10 10 /gram of bacteria agent. The phosphate-dissolving microorganism is a microbial agent added with a carrier conventionally, and the quantity of the microorganism is required to reach 10 8- 10 10 And/or gram of bacteria agent.
Further preferably, the phosphorus-decomposing microorganism is bacillus subtilis (B.SUBTILIS), and the market price is relatively low, the acquisition path is relatively convenient, and the culture technology is relatively mature.
In long-term heavy metal stress, the resistant phosphate solubilizing bacteria can eat a part of heavy metal, combine the heavy metal with own cell components or protein to form complex ions to be discharged out of the body, reduce the harm of the complex ions or the extracellular effect of the cells, combine with harrow sites on cell membranes and inactivate the heavy metal. In addition, the phosphate-dissolving microorganism can decompose insoluble phosphate in the soil such as calcium phosphate, and then the phosphate radical changes the physicochemical properties of heavy metals in the modes of ion exchange, surface adsorption, coprecipitation and the like, so that the mobility of the phosphate radical is reduced, and the harm of the phosphate radical is reduced.
Ferrous oxide has reducibility, can reduce heavy metal toxicity, and forms a complex, so that mobility of the complex is reduced.
The preparation method of the stabilizer for restoring the heavy metal composite pollution of the soil comprises the following steps:
respectively weighing red mud, ground phosphate rock, peat, ferrous oxide and phosphate-dissolving microorganism according to the mass percentages, and uniformly mixing to obtain the stabilizer.
The invention also provides application of the stabilizing agent for restoring the heavy metal composite pollution of the soil, which comprises the steps of uniformly mixing the prepared stabilizing agent with the heavy metal composite pollution soil to form stable aged soil, and obtaining restored soil; preferably stable aging is carried out for at least 24 hours.
When the humidity of the stabilized soil is not 20-40%, water is added into the stabilized soil for adjustment; the humidity of the stabilized soil is preferably 30%.
The application of the stabilizing agent for restoring the heavy metal composite pollution of the soil is that the addition amount of the stabilizing agent is 1.5-3%, preferably 2% of the mass of the heavy metal composite pollution soil.
The application of the stabilizing agent for restoring the heavy metal composite pollution of the soil is particularly used for restoring the heavy metal composite pollution of the soil; preferably, the heavy metal comprises at least one of cadmium, lead, arsenic and chromium.
The stabilizer prepared by the invention is convenient to apply to the polluted soil restoration step, the cost of the contained medicament components is low (the price of the restoration medicament in the market is generally 1500-2000 yuan/ton, the medicament is controlled to be about 1200 yuan/ton, no secondary pollution is caused, the practicability is strong, the stabilizing effect of the soil stabilizer is remarkable, the use efficiency is high, the stabilizing time of the soil stabilizer is short (generally, the stabilizing time of the soil stabilizer is more than 48 hours, the ideal effect can be achieved only by 24 hours), after the product formula is applied to the polluted soil, the pollution of heavy metals of cadmium, lead, arsenic and chromium can be obviously reduced, the stability of cadmium, lead, arsenic and chromium in the soil can be ensured for a long time, the re-release of the heavy metals of cadmium, lead, arsenic and chromium can be prevented, the soil utilization efficiency is improved, the physicochemical property of the soil is improved, and a novel and high-efficiency method is provided for treating the soil pollution containing cadmium, lead, arsenic and chromium.
The stabilizer has larger specific surface area and rich pores, and a large number of functional groups, the characteristics accelerate the adsorption of heavy metal pollutants through surface adsorption, electrostatic action and complexation, and can effectively fix heavy metal ions of cadmium, lead, arsenic and chromium.
The red mud adopted by the invention is alkaline, has complexing action on heavy metal ions and also has strong adsorption action; the sewage peat is rich in porous structures, and a larger specific surface area is provided, so that the number of binding sites of cadmium, lead, arsenic, chromium and other heavy metal ions can be greatly increased, the mobility of the heavy metal ions is reduced, the graphite-like structure can promote electron transfer, thereby promoting the oxidation or reduction of heavy metal pollutants, and a large number of soil aggregates are easily formed in soil after the sewage peat is added, so that the adsorption quantity of the heavy metal ions is improved.
The invention has the beneficial effects that:
(1) Under the comprehensive actions of red mud, ground phosphate rock, peat, ferrous oxide and phosphate-dissolving microorganisms, heavy metal ions are chemically precipitated, chelated and adsorbed in the acid soil through the comprehensive actions of improving the pH of the soil and the like.
(2) The existing soil restoration agent is too simple in composition and single in functional effect, is comprehensive in property, has various functions and can treat composite pollutants.
(3) The existing soil restoration agent has high production cost and complex manufacturing process, the raw materials of the soil restoration agent are basically natural waste or industrial waste, the manufacturing process is simple, and the processing cost is low.
(4) The invention also discovers that when the phosphate solubilizing microorganism and the sludge carbon are used in proportion, the microorganism amount in unit volume is increased sharply, the activity is more than 5 times of that of the common unit volume, the drug effect of the whole soil stabilization agent is improved by 2-5 times, the phosphate solubilizing microorganism can eat a part of heavy metals, combine the phosphate solubilizing microorganism with own cell components or protein to form complex ions to be discharged out of the body, reduce the harmfulness of the phosphate solubilizing microorganism or the extracellular effect of cells, combine with harrow sites on cell membranes and inactivate the heavy metals. In addition, the phosphate-dissolving microorganisms can decompose insoluble phosphate in the soil such as calcium phosphate, so that the more the amount is, the better the natural effect is, and the use amount of the phosphate-dissolving agent is greatly reduced compared with other stabilizing agents under the same condition.
(5) The addition of the phosphate solubilizing microorganism to a certain extent can greatly reduce the use amount of ferrous oxide, and the inventor knows that the ferrous oxide needs to be continuously added when the phosphate solubilizing microorganism is not added, because the ferrous oxide is oxidized and fails when heavy metal is passivated, but the addition of the phosphate solubilizing microorganism has a reducing effect on the ferrous oxide, so that the ferrous oxide can be recycled, the effect of the medicament can be greatly improved, and the use amount of the medicament is reduced, thereby obtaining higher economic benefit.
Detailed Description
The following describes the technical scheme of the present invention by specific examples, but does not limit the scope of the claims of the present invention.
Example 1
100g of stabilizer for restoring heavy metal composite pollution of soil is prepared, and the stabilizer comprises the following raw material components in percentage by mass: 55% of red mud, 35% of phosphate rock powder, 3% of sludge carbon, 5% of ferrous oxide and 2% of bacillus subtilis (B.SUBTILIS) (the biomass in the microbial inoculum is 10) 10 About/g, the same applies below). Respectively weighing red mud, ground phosphate rock, peat, ferrous oxide and phosphate-dissolving microorganism according to the mass percentages, and uniformly mixing to obtain the stabilizer.
Example 2
100g of stabilizer for restoring heavy metal composite pollution of soil is prepared, and the stabilizer comprises the following raw material components in percentage by mass: 60% of red mud, 30% of ground phosphate rock, 2% of sewage, 6% of ferrous oxide and 2% of bacillus subtilis (B.SUBTILIS). Respectively weighing red mud, ground phosphate rock, peat, ferrous oxide and phosphate-dissolving microorganism according to the mass percentages, and uniformly mixing to obtain the stabilizer.
Example 3
100g of stabilizer for restoring heavy metal composite pollution of soil is prepared, and the stabilizer comprises the following raw material components in percentage by mass: 60% of red mud, 30% of ground phosphate rock, 4% of sludge carbon, 5% of ferrous oxide and 1% of bacillus subtilis (B.SUBTILIS). Respectively weighing red mud, ground phosphate rock, peat, ferrous oxide and phosphate-dissolving microorganism according to the mass percentages, and uniformly mixing to obtain the stabilizer.
Example 4
100g of stabilizer for restoring heavy metal composite pollution of soil is prepared, and the stabilizer comprises the following raw material components in percentage by mass: 60% of red mud, 30% of ground phosphate rock, 3% of sludge carbon, 6% of ferrous oxide and 1% of bacillus subtilis (B.SUBTILIS). Respectively weighing red mud, ground phosphate rock, peat, ferrous oxide and phosphate-dissolving microorganism according to the mass percentages, and uniformly mixing to obtain the stabilizer.
Comparative example 1
A stabilizer for restoring heavy metal composite pollution of soil comprises the following raw materials in parts by weight: phosphate rock powder; the total of the sewage and the soil is 100g in a ratio of 6:3:1, and 20g of ferrous oxide is added. Respectively weighing red mud, ground phosphate rock, peat and ferrous oxide according to the proportion, and uniformly mixing to obtain the stabilizer.
Comparative example 2
A stabilizer for restoring heavy metal composite pollution of soil comprises the following raw materials in parts by weight: phosphate rock powder; the total of the sewage and the soil is 100g in a ratio of 6:3:1, and 15g of ferrous oxide and 2g of bacillus subtilis (B.SUBTILIS) are added.
Respectively weighing red mud, ground phosphate rock, sewage peat, ferrous oxide and bacillus subtilis according to the proportion, and uniformly mixing to obtain the stabilizer.
Comparative example 3
A stabilizer for restoring heavy metal composite pollution of soil comprises the following raw materials in parts by weight: phosphate rock powder; the total of the sewage and the soil is 100g in a ratio of 6:3:1, and 10g of ferrous oxide and 2g of bacillus subtilis (B.SUBTILIS) are added.
Respectively weighing red mud, ground phosphate rock, sewage peat, ferrous oxide and bacillus subtilis according to the proportion, and uniformly mixing to obtain the stabilizer.
Comparative example 4
A stabilizer for restoring heavy metal composite pollution of soil comprises the following raw materials in parts by weight: phosphate rock powder; the total of the sewage and the soil is 100g in a ratio of 6:3:1, and then 5g of ferrous oxide and 2g of bacillus subtilis (B.SUBTILIS) are added. Respectively weighing red mud, ground phosphate rock, peat and ferrous oxide according to the proportion, and uniformly mixing to obtain the stabilizer.
The stabilizing agents prepared in each group of examples and comparative examples are subjected to soil heavy metal stabilization experiments under the same condition, 5g of soil to be tested is taken in each group, and the soil is uniformly mixed with 0.1g of the stabilizing agent prepared in each example or comparative example, wherein the water content of the soil is 30%; the settling time was 24h. As, cd, cr, pb the contents were determined by electron coupled plasma mass spectrometry. The blank is the same weight of soil treated without any stabilizer.
The experimental results are shown in table 1:
meanwhile, the test of the addition amount of the medicament in the optimal proportion example 2 shows that the following conclusion is drawn:
the stabilizer prepared by the method can have remarkable stabilizing effect on heavy metals of cadmium, lead, arsenic and chromium in acid soil, can effectively improve the structure of the soil, can greatly reduce the use amount of ferrous oxide by adding phosphate dissolving microorganisms to a certain extent, has similar repairing effect and optimal effect for repairing polluted soil, wherein the red mud is 60%, the phosphate rock powder is 30%, the sewage is 2%, the ferrous oxide is 6% and the phosphate dissolving microorganisms are 2% of the optimal formula, and the adding amount is 2% and is the best comprehensive effect.
Claims (3)
1. The stabilizer for repairing the heavy metal composite pollution of the soil is characterized by comprising the following raw material components in percentage by mass: 52-60% of red mud, 30-35% of ground phosphate rock, 2-4% of sludge peat, 5-8% of ferrous oxide and 1-2% of phosphate-dissolving microorganism;
the main component of the red mud is CaO and Al 2 O 3 —SiO 2 The method comprises the steps of carrying out a first treatment on the surface of the The phosphorite powder is mainly fluorapatite Ca 5 (PO 4 ) 3 F, the purity is more than or equal to 60%;
the sludge carbon is activated sludge peat prepared by treating activated sludge at a high temperature of 400-800 ℃;
the phosphate solubilizing microorganism comprises: at least one of Bacillus megaterium (B.megaterium), bacillus subtilis (B.subtilis), bacillus pumilus (B.pumilus), and Bacillus pumilus (B.BREVIS) of the genus Bacillus (BACILLUS); the microorganism number is 10 8 —10 10 /g;
the stabilizer for restoring the heavy metal composite pollution of the soil is prepared by respectively weighing red mud, ground phosphate rock, sludge dust, ferrous oxide and phosphate dissolving microorganisms according to the mass percentages and uniformly mixing.
2. The stabilizer for repairing heavy metal composite pollution of soil according to claim 1, wherein the stabilizer comprises the following raw material components in percentage by mass: 60% of red mud, 30% of phosphate rock powder, 2% of sewage peat, 6% of ferrous oxide and 2% of phosphate-dissolving microorganism.
3. The application of the stabilizing agent for restoring the heavy metal composite pollution of the soil according to claim 1 or 2, which is characterized in that the stabilizing agent prepared is uniformly mixed with the heavy metal composite pollution soil to form stable aged soil for at least 24 hours, and the restored soil is obtained;
when the humidity of the stabilized soil is not 20-40%, adding water into the stabilized soil for adjustment;
the addition amount of the stabilizer is 1.5-3% of the mass of the heavy metal composite polluted soil;
the method is used for repairing the heavy metal composite pollution of the soil; the heavy metals include: cadmium, lead, arsenic and chromium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210881330.0A CN115228925B (en) | 2022-07-26 | 2022-07-26 | Stabilizer for restoring soil heavy metal composite pollution and preparation and application thereof |
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| CN202210881330.0A CN115228925B (en) | 2022-07-26 | 2022-07-26 | Stabilizer for restoring soil heavy metal composite pollution and preparation and application thereof |
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| CN115228925A CN115228925A (en) | 2022-10-25 |
| CN115228925B true CN115228925B (en) | 2024-02-23 |
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