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Biological eluting agent for treating antimony and arsenic polluted soil and eluting method

A technology of arsenic pollution and leaching agent, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of large amount of leaching agent, soil pollution, and low leaching efficiency, and improve Effects of community diversity, reduced soil acidification, and low leaching agent concentration

Pending Publication Date: 2022-05-06
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A Chinese patent discloses a method of using sodium humate solution and citric acid to restore Cu and Zn heavy metal-contaminated soil (patent number 201910754763.8). This method consumes a large amount of leaching agent and takes a long time to process, and the leaching efficiency of Cu and Zn heavy metals is low. Low, large amount of eluent and long processing time lead to high processing cost, which is not conducive to engineering application
A Chinese patent discloses a chemical leaching agent and its remediation method for simultaneously removing heavy metals and arsenic in soil (Patent No. 200810198393.6), using EDTA, ammonia and oxalic acid to restore Cd, Cu, Pb, Zn and As contaminated soil , this method uses artificial chelating agent EDTA is not conducive to biodegradation, excessive use will remain in the soil, causing secondary pollution
[0005] Existing leaching agents and leaching methods have high removal efficiency for soil contaminated with divalent cation heavy metals such as Cd, Cu, Pb, and Zn, but the leaching efficiency for heavy metals Sb and As is relatively low. At the same time, Sb, As, etc. The problem of soil pollution caused by variable price heavy metals is becoming more and more serious

Method used

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  • Biological eluting agent for treating antimony and arsenic polluted soil and eluting method
  • Biological eluting agent for treating antimony and arsenic polluted soil and eluting method
  • Biological eluting agent for treating antimony and arsenic polluted soil and eluting method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Collect 0-50cm antimony and arsenic contaminated soil in an antimony mining area, dry it naturally, remove large gravels, grind the soil samples through 20-mesh and 100-mesh soil sieves and mix evenly, weigh 0.2g of 100-mesh soil samples for use (1+1) Digested in aqua regia water bath, the total amount of antimony and arsenic in the soil was determined, the Sb content was 6156.60 mg / kg, and the As content was 7747.12 mg / kg. One-step rinsing: Weigh 5.0g of soil passed through a 20-mesh sieve and add it to a 100ml PET plastic bottle. 7 CFU / ml iron-reducing bacteria suspension (Gram-negative bacilli), put the PET plastic bottle in an inversion shaker, shake at a constant speed of 90r / min for 12h, centrifuge at 3000rad / min for solid-liquid separation and pour the supernatant. Two-step rinsing: Add 20ml of mixed eluent (0.1mol / L quinic acid, 0.05mol / L sodium dihydrogen phosphate, 0.05mol / L Sodium diethylenetriaminepentaacetate mixed solution, the volume ratio is 4:1:1), and...

Embodiment 2

[0028] Collect 0-50cm of antimony and arsenic contaminated soil in an antimony mining area, dry it naturally, remove large gravels, grind the soil samples through 20 mesh and 100 mesh soil sieves and mix evenly, weigh 0.2g of 100 mesh soil samples (1+1) Wang Digested in a water bath to determine the total amount of antimony and arsenic in the soil, in which the Sb content was 6156.60 mg / kg, and the As content was 7747.12 mg / kg. One-step rinsing Weigh 5.0g of soil through a 20-mesh sieve and add it to a 100ml PET plastic bottle, add 15ml according to the liquid-solid ratio 6 CFU / ml iron-reducing bacteria suspension (Gram-negative bacilli), put the PET plastic bottle in an inversion shaker, shake at a constant speed of 90r / min for 12h, centrifuge at 3000rad / min for solid-liquid separation and pour the supernatant. Two-step rinsing In the solid after one-step rinsing, add 30ml of mixed eluent (0.1mol / L quinic acid, 0.05mol / L sodium dihydrogen phosphate, 0.05mol / L Sodium ethylene...

Embodiment 3

[0030] Collect 0-50cm of antimony and arsenic contaminated soil in an antimony mining area, dry it naturally, remove large gravels, grind the soil samples through 20 mesh and 100 mesh soil sieves and mix evenly, weigh 0.2g of 100 mesh soil samples (1+1) Wang Digested in a water bath to determine the total amount of antimony and arsenic in the soil, in which the Sb content was 6156.60 mg / kg, and the As content was 7747.12 mg / kg. One-step rinsing: Weigh 5.0g of soil passed through a 20-mesh sieve and add it to a 100ml PET plastic bottle. 6CFU / ml iron-reducing bacteria suspension (Gram-negative bacilli), put the PET plastic bottle in an overturning shaker, shake at a constant speed of 90r / min for 16h, centrifuge at 3000rad / min for solid-liquid separation and pour the supernatant. Two-step rinsing: Add 40ml of mixed eluent (0.1mol / L quinic acid, 0.05mol / L sodium dihydrogen phosphate, 0.05mol / L Sodium diethylenetriaminepentaacetate mixed solution, the volume ratio is 4:1:2), and t...

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Abstract

The invention discloses a biological eluting agent for treating antimony and arsenic polluted soil and an eluting method, and belongs to the field of soil heavy metal pollution remediation. The biological eluting agent comprises an iron-reducing bacterium suspension, and a compound eluting agent prepared by mixing a quinic acid solution, a sodium dihydrogen phosphate solution and a sodium diethylenetriamine pentaacetate solution according to a volume ratio of 4: 1: 1-4: 3: 3. The leaching method adopts step-by-step leaching, firstly, iron reducing bacteria suspension is adopted for one-step leaching, ferric iron in the soil is reduced into ferrous iron, an iron-aluminum oxide crystal structure formed by the ferrous iron and antimony and arsenic is destroyed, and dissolution of antimony and arsenic from soil particles is promoted; and carrying out two-step leaching by adopting a compound leaching agent. The antimony and arsenic contaminated soil is remedied by combining reduction dissolution of microorganisms and acidity and ligand exchange of the compound eluting agent, the heavy metal removal rate can reach 90% or above, and the eluting agent is good in biodegradability, few in residues in soil and has the characteristic of green and sustainable remediation.

Description

technical field [0001] The invention relates to the technical field of remediation of soil heavy metal pollution, in particular to a biological leaching agent and a leaching method for treating antimony and arsenic polluted soil. Background technique [0002] With the continuous acceleration of industrialization and urbanization in our country, the problem of soil pollution is becoming more and more serious. For example, cultivated land soil, urban soil, and mining area soil are all polluted to varying degrees. The polluted cultivated land soil accounts for about 10%. Up to hundreds of thousands of hectares, polluted land resources pose a serious threat to human living environment, food safety and sustainable development of agriculture. Soil control and remediation is imminent. At present, the remediation and treatment technologies for heavily polluted soil mainly include solidification and stabilization, soil leaching, and microbial remediation. [0003] As a fast, efficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08B09C1/10C09K109/00
CPCC09K17/40B09C1/08B09C1/10C09K2109/00
Inventor 林宏飞廖长君谢冬燕蓸斐姝颜德鹏陈建平
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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