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A method for solidifying and stabilizing heavy metal contaminated soil

A heavy metal-contaminated soil and stabilization technology, which is applied in the field of contaminated soil treatment and foundation treatment, can solve the problems of poor uniformity of heavy metal-contaminated soil, poor stabilization effect of harmful ions, and many times of grouting, so as to overcome the defects of secondary pollution , package structure optimization, and the effect of reducing complexity

Active Publication Date: 2022-07-26
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Technical problems: the existing technology is difficult to overcome the problems of poor uniformity, low strength, and poor stability of harmful ions in the treatment of heavy metal-contaminated soil by in-situ stirring, and it is also difficult to overcome the defects of low strength and poor stability of heavy metal ions by stirring in different places. Microbial grouting is used However, there are problems such as many times of grouting, complex process and poor uniformity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this example, a method for solidifying and stabilizing heavy metal contaminated soil is used for the in-situ treatment of heavy metal contaminated silt sites, and the in-situ stirring method is adopted to solidify and stabilize heavy metal contaminated soil, and the specific steps are as follows;

[0023] a. Make the urease-producing bacteria and the culture solution into the concentration OD 600 = 1.5 bacterial liquid, add 0.25mol urea in every L bacterial liquid, make urea bacterial liquid mixed solution;

[0024] b. The urea bacteria liquid mixture is stirred into the heavy metal contaminated soil according to the mass ratio of 1:6, and the mixture is evenly stirred;

[0025] c. Add 430g / L of CaSO to the urea solution with a concentration of 2.5mol / L 4 ·2H 2 O whisker, 1.5g / L sodium carboxymethyl cellulose, make a mixed suspension, in which CaSO 4 ·2H 2 The length of the O whisker single crystal is 200 μm;

[0026] d. according to the mass ratio of 1:5, the m...

Embodiment 2

[0029] In this example, in this example, a method for solidifying and stabilizing heavy metal-contaminated soil is used for the off-site treatment of heavy-metal-contaminated sandy soil. The heavy-metal-contaminated sandy soil is excavated, stirred, solidified, stabilized, and backfilled. The specific steps are as follows:

[0030] a. Make the urease-producing bacteria and the culture solution into the concentration OD 600 =1.25 bacterial liquid, add 0.175mol urea in every L bacterial liquid, make urea bacterial liquid mixed solution;

[0031] b. The urea bacteria liquid mixture is stirred into the heavy metal contaminated soil according to the mass ratio of 1:6, and the mixture is evenly stirred;

[0032] c. Add 345g / L of CaSO to the urea solution with a concentration of 2mol / L 4 ·2H 2 O whisker, 1g / L sodium carboxymethyl cellulose, make a mixed suspension, in which CaSO 4 ·2H 2 The length of the O whisker single crystal is 150 μm;

[0033] d. according to the mass ratio...

Embodiment 3

[0036] In this example, a method for solidifying and stabilizing heavy metal-contaminated soil is used for off-site treatment of heavy-metal-contaminated silty clay. The heavy metal-contaminated silty clay is excavated, stirred, solidified, stabilized, and backfilled. The specific steps are as follows:

[0037]a. Make the urease-producing bacteria and the culture solution into the concentration OD 600 = 1.0 bacteria liquid, add 0.1mol urea in every L bacteria liquid, make urea bacteria liquid mixture;

[0038] b. The urea bacteria liquid mixture is stirred into the heavy metal contaminated soil according to the mass ratio of 1:6, and the mixture is evenly stirred;

[0039] c. Add 260g / L of CaSO to the urea solution with a concentration of 1.5mol / L 4 ·2H 2 O whisker, 0.5g / L sodium carboxymethyl cellulose, make a mixed suspension, in which CaSO 4 ·2H 2 The length of the O whisker single crystal is 100 μm;

[0040] d. according to the mass ratio of 1: 5, the mixed suspension...

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PUM

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Abstract

A method for solidifying and stabilizing heavy metal contaminated soil for solving the problem of heavy metal ion pollution in soil, utilizing CaSO 4 ·2H 2 Slightly soluble in water and anisotropically soluble properties of O whiskers, using CaSO with a specific single crystal length 4 ·2H 2 The O whisker suspension is mixed into heavy metal contaminated soil to control the rate of microbial induced mineralization deposition, and significantly improve the uniformity, strength and harmful ion stability of the microbial stirring method in the treatment of heavy metal contaminated soil. The main steps of the method are as follows: mixing and stirring the urease-producing bacterial liquid and urea into the heavy metal contaminated soil, and then stirring and adding CaSO 4 ·2H 2 The mixed suspension of O-whisker and sodium carboxymethyl cellulose is left to stand to complete the treatment. Use in-situ mixing machinery to mix the heavy metal contaminated soil in situ, or use the heavy metal contaminated soil to be excavated and then agitated to treat the heavy metal contaminated soil.

Description

technical field [0001] The invention relates to a method for solidifying and stabilizing heavy metal polluted soil by a microorganism-induced mineral deposition technology controlling a reaction process, belonging to the field of polluted soil treatment and foundation treatment. Background technique [0002] Microbial-induced carbonate precipitation technology has attracted increasing attention as a new technology for soil heavy metal pollution remediation. The microbial-induced carbonate precipitation technology is used to combine heavy metal ions with carbonate radicals to form insoluble precipitates, so that heavy metal pollutants are no longer diffused. This type of method is based on biomineralization, and the microbial remediation technology of remediating heavy metal-contaminated soil by consolidating heavy metal ions is simple and easy to operate, and can effectively reduce the harm of metal ions to the environment. [0003] The technical solution of the prior art ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/10
Inventor 邵光辉戴浩然刘鹏
Owner NANJING FORESTRY UNIV
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