Remediation Tests of Zn<sup>2+</sup> Contaminated Soil by Soybean Urease

BIAN Hanliang; ZHANG Xugang; HAN Yi; LI Beibei; ZHANG Jianwei

doi:10.13204/j.gyjzG20110216

Volume 52 Issue 11

Nov. 2022

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BIAN Hanliang, ZHANG Xugang, HAN Yi, LI Beibei, ZHANG Jianwei. Remediation Tests of Zn2+ Contaminated Soil by Soybean Urease[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(11): 67-70,66. doi: 10.13204/j.gyjzG20110216

Citation:

BIAN Hanliang, ZHANG Xugang, HAN Yi, LI Beibei, ZHANG Jianwei. Remediation Tests of Zn²⁺ Contaminated Soil by Soybean Urease[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(11): 67-70,66. doi: 10.13204/j.gyjzG20110216

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Remediation Tests of Zn²⁺ Contaminated Soil by Soybean Urease

doi: 10.13204/j.gyjzG20110216

BIAN Hanliang^1,2,3,
ZHANG Xugang³,
HAN Yi³,
LI Beibei³,
ZHANG Jianwei^{1,2,3
,
,}

1. Special Soil Modification and Restoration Engineering Technology Research Center of Kaifeng, Kaifeng 475004, China;
2. Henan Provincial Research Center of Engineering on Intelligent Construction of Rail Transit, Kaifeng 475004, China;
3. School of Civil Engineering and Architecture of Henan University, Kaifeng 475004, China

Received Date: 2020-11-02

Abstract

Abstract

In order to study the treatment effect of Enzyme Induced Calcium Carbonate Precipitation (EICP) on Zn²⁺ contaminated soil, abundant urease was extracted from soybean, mineralization of heavy metal Zn²⁺ with substrate induction was implemented. The different forms of Zn²⁺ in contaminated sand before and after remediation were extracted and detected by Tessier’s five-step continuous extraction method, and the mechanical properties of different remediation times were compared through unconfined compressive strength tests. Results showed that the extracted urease had a good activity and it could effectively catalyzed the hydrolysis of urea to form carbonate ions, which could form carbonate precipitation and mineralize Zn²⁺ in the induction of substrate. EICP technology could effectively reduce the content of Zn²⁺ in contaminated sand, and fix it in the form of carbonate, moreover, the unconfined compression strength of the repaired sand increased from 0 to 0.44 MPa after repaired 3 times. EICP technology provided a new choice for the remediation of heavy metal Zn²⁺ contaminated soil.
- soybean urease,
- urease induction of carbonate precipitation,
- heavy metal Zn²⁺,
- contaminated soil

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References(17)

References

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