EXPERIMENTAL STUDY ON REMEDIATION OF HEAVY METAL CONTAMINATED SOIL BY EICP COMBINED WITH BIOCHAR

LU Ailing; ZHU Dongyun; ZHANG Hong; CAO Han; ZHANG Jing

doi:10.13205/j.hjgc.202308022

Volume 41 Issue 8

Aug. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(8): 176-180

LU Ailing, ZHU Dongyun, ZHANG Hong, CAO Han, ZHANG Jing. EXPERIMENTAL STUDY ON REMEDIATION OF HEAVY METAL CONTAMINATED SOIL BY EICP COMBINED WITH BIOCHAR[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 176-180. doi: 10.13205/j.hjgc.202308022

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LU Ailing, ZHU Dongyun, ZHANG Hong, CAO Han, ZHANG Jing. EXPERIMENTAL STUDY ON REMEDIATION OF HEAVY METAL CONTAMINATED SOIL BY EICP COMBINED WITH BIOCHAR[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 176-180. doi: 10.13205/j.hjgc.202308022

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EXPERIMENTAL STUDY ON REMEDIATION OF HEAVY METAL CONTAMINATED SOIL BY EICP COMBINED WITH BIOCHAR

doi: 10.13205/j.hjgc.202308022

1. School of Earth Science and Information Physics, Central South University, Changsha 410083, China;
2. Shangtian Environmental Restoration Co., Ltd., Changzhou 213022, China

Received Date: 2022-08-04
Available Online: 2023-11-15

Abstract

Abstract

Urease induced calcite precipitation (EICP), a new biomimetic mineralization technology, shows great potential in repairing heavy metal contaminated soil. The technical routine of combining EICP with biochar to solidify Pb in contaminated soil was carried out, and the solidification effect was evaluated and the mechanism was discussed by toxicity leaching and calcium carbonate content test. The result showed that EICP could effectively solidify Pb, and the solidification rate was the highest when the amount of EICP treatment reagent was 6.6%, and the solidification rate increased with the increase of calcium carbonate content. Compared with EICP applied alone, EICP combined with biochar significantly improved the curing effect of lead-contaminated soil, and the incorporation amount of biochar was 6.6%, showing the highest solidification rate. The mechanism of EICP combined with biochar to improve the Pb solidification effect, was that the biochar is alkaline and can adsorb Pb on a large specific surface area, and the numerous tiny pores of the biochar can provide a site for the EICP mineralization reaction. This study provided new ideas and experimental guidance for EICP remediation of heavy metal contaminated soil.
- EICP,
- solidification,
- remediation,
- biochar,
- contaminated soil,
- heavy metal

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References(33)

References

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