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Method for repairing heavy metal contaminated soil by combination of biochar and iron-reducing bacteria agent

A technology of combined restoration of polluted soil, applied in the field of soil restoration, can solve the problems of limited popularization and application of technology, unstable restoration effect, insignificant effect, etc., and achieve the effect of low cost, outstanding passivation and aging effects, and good application prospects

Active Publication Date: 2014-04-30
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although microbial remediation technology has attracted increasing attention, due to the difficulty in finding suitable strains, most of the reported microbial remediation methods have no significant effect, slow effect, and unstable repair effect, which limits the popularization and application of this technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add only biochar to contaminated soil:

[0023] Pass the contaminated soil through a 2.36mm mesh sieve, take 2000g, add 200g of prepared straw biochar (through a 4.0mm mesh sieve), and mix evenly; then use deionized water to adjust the soil humidity to 60% of the saturated water holding capacity of the field, and naturally After stacking for 60 days (adjust the soil moisture content to the initial value with deionized water in due course), the concentration values ​​of Zn, Pb and Cd in the bioavailable, moderately available and refractory forms in the soil were measured.

[0024] The results showed that the soil pH value rose to 7.4; the concentrations of Zn, Pb and Cd in the bioavailable state were 469.8, 207.5 and 2.1 mg / kg, respectively, which decreased by 39.3, 33.1 and 37.0%; The concentrations of Zn and Cd were 1767.3, 456.5 and 7.4mg / kg, respectively, in which Zn increased by 15.1%, and the concentrations of Pb and Cd decreased by 13.2 and 28.6% respectively; 28...

Embodiment 2

[0026] Add only iron-reducing bacteria to contaminated soil:

[0027] Pass the contaminated soil through a 2.36mm mesh sieve, take 2000g, and inoculate 80mL of iron-reducing bacteria agent (the effective number of viable bacteria is 1.75×10 10 , among which, the ratio of the effective number of viable bacteria of Corynebacterium humus, Comamonas and Cranibacterium ferroreducens is 0.8:1.3:1), and then the soil humidity was adjusted to 60% of the saturated water holding capacity of the field with deionized water, and the room temperature After natural stacking for 60 days (timely use deionized water to adjust the soil moisture content to the initial value), the concentration values ​​of Zn, Pb and Cd in the bioavailable, moderately available and refractory forms in the soil were measured.

[0028] The results showed that the soil pH value increased to 6.5; the concentrations of Zn, Pb and Cd in the bioavailable state were 643.3, 247.8 and 2.9 mg / kg, respectively, which decrease...

Embodiment 3

[0030] Simultaneous application of biochar and iron-reducing bacteria in contaminated soil:

[0031] Pass the contaminated soil through a 2.36mm mesh sieve, take 2000g, add 200g of prepared straw biochar (passed through a 4.0mm mesh sieve), and mix evenly; then add 80mL of iron-reducing bacteria agent (same as Example 2), and adjust with deionized water The soil moisture is 60% of the saturated water holding capacity of the field, and after 60 days of natural stacking at room temperature (adjust the soil moisture content to the initial value with deionized water in due course), the bioavailable, moderately available and refractory forms in the soil are measured Concentration values ​​of Zn, Pb and Cd.

[0032] The results showed that the soil pH value rose to 7.0; the concentrations of Zn, Pb and Cd in the bioavailable state were 408.8, 185.9 and 1.2 mg / kg, respectively, which decreased by 47.2, 40.0 and 65.9%; The concentrations of Zn and Cd were 1732.3, 430.0 and 8.7mg / kg, ...

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Abstract

The invention discloses a method for repairing heavy metal contaminated soil by combination of biochar and an iron-reducing bacteria agent. Adsorption of the biochar and oxidation-reduction of iron-reducing bacteria are fully exerted, and the bioremediation process of the heavy metal contaminated soil is greatly accelerated by the synergistic effect. An organic waste for preparing the biochar disclosed by the invention is wide in source, and low in cost; the iron-reducing bacteria agent is simple in preparation method, aeration facilities do not need to be added in the soil repairing process by the anaerobic metabolism ability, and operation is facilitated. The method for repairing the heavy metal contaminated soil by combination of the biochar and the iron-reducing bacteria agent has the advantages of a bioremediation technology, is outstanding in heavy metal fixing, passivating and ageing effects, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for jointly remediating heavy metal-contaminated soil by using biochar and an iron-reducing bacterial agent. Background technique [0002] Soil heavy metal pollution not only leads to the degradation of soil and the reduction of crop yield and quality, but also may threaten human health through direct contact and food chain. Therefore, the remediation of heavy metal-contaminated soil has become a hot spot at home and abroad in recent years. At present, there are mainly the following methods for heavy metal pollution remediation: one is to change the state of heavy metals, reduce their mobility and bioavailability in the environment, that is, passivation of heavy metals; the other is to change heavy metals into soluble by engineering means After leaching, the heavy metals in the eluate are collected, so as to achieve the dual purpose of recycling and...

Claims

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Application Information

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IPC IPC(8): B09C1/10
Inventor 余震周顺桂岳艳丽
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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