EXPERIMENTAL STUDY OF H<sub>2</sub>O<sub>2</sub> OXIDATION COUPLED WITH CHEMICAL WASHING TO REMEDY CHROMIUM-CONTAMINATED CLAYED SOIL FROM AN ELECTROPLATE FACTORY

WANG Mu; SONG Junjie; XIE Ronghuan; LI Weiping; LIU Guijian

doi:10.13205/j.hjgc.202208017

Volume 40 Issue 8

Nov. 2022

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WANG Mu, SONG Junjie, XIE Ronghuan, LI Weiping, LIU Guijian. EXPERIMENTAL STUDY OF H2O2 OXIDATION COUPLED WITH CHEMICAL WASHING TO REMEDY CHROMIUM-CONTAMINATED CLAYED SOIL FROM AN ELECTROPLATE FACTORY[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(8): 125-130. doi: 10.13205/j.hjgc.202208017

Citation:

WANG Mu, SONG Junjie, XIE Ronghuan, LI Weiping, LIU Guijian. EXPERIMENTAL STUDY OF H₂O₂ OXIDATION COUPLED WITH CHEMICAL WASHING TO REMEDY CHROMIUM-CONTAMINATED CLAYED SOIL FROM AN ELECTROPLATE FACTORY[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(8): 125-130. doi: 10.13205/j.hjgc.202208017

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EXPERIMENTAL STUDY OF H₂O₂ OXIDATION COUPLED WITH CHEMICAL WASHING TO REMEDY CHROMIUM-CONTAMINATED CLAYED SOIL FROM AN ELECTROPLATE FACTORY

doi: 10.13205/j.hjgc.202208017

WANG Mu^1,2,
SONG Junjie^1,2,3,
XIE Ronghuan^1,2,3,
LI Weiping^{1,2
,
,},
LIU Guijian^2,3

1. Anhui Guozhen Environmental Remediation Co., Ltd, Hefei 230088, China;
2. Hefei Engineering Research Center for Soil and Groundwater Remediation, Hefei 230088, China;
3. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

Received Date: 2021-11-11
Publish Date: 2022-11-08

Abstract

Abstract

In this work, H₂O₂ oxidation combined with soil chemical washing to remove hexavalent chromium and total chromium of contaminated soil collected from the electroplating factory in Hefei was developed. The effects of concentration of hydrogen peroxide, and eluting agents on remediation efficiency of chromium-contaminated soil were evaluated via batch experiment. The maximum removal efficiencies of hexavalent chromium and total chromium could achieve 51.5% and 20.9% for 10% H₂O₂ oxidation treatment. The soil was also washed by hydrochloric acid alone and citric acid alone, respectively, and the hexavalent chromium concentrations that remained in the soil under these conditions still exceeded the standard value in Soil Environmental Quality, Risk Control Standard for Soil Contamination of Development Land in China. However, hexavalent chromium and total chromium removal efficiency were promoted after combining H₂O₂ oxidation with hydrochloric acid washing, achieving 85.5% and 50.6% when the concentration of hydrochloric acid was 1.0 mol/L and the solid-liquid ratio was 1∶4. The hexavalent chromium that remained in the soil was as low as 4.4 mg/kg, which was lower than the standard value. The morphological analysis by Tessier’s five-step extraction showed that the proportion of residual form obtained in the soil increased from 44.7% to 93.4% after this technology was applied, which significantly reduced the risk of chromium re-release. This work can provide a way for remediation and utilization of heavy metal chromium from chromium-contaminated soil.
- H₂O₂ oxidation,
- chemical soil washing,
- eluting agent,
- chromium-contaminated soil,
- soil remediation

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References(23)

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