EXTRACELLULAR POLYMERIC SUBSTANCES OF ASPERGILLUS TUBINGENSIS AND BENTONITE PASSIVATION SOIL LEAD

ZHANG Xiang-lu; LIU You-yan; LU Yu-hao; TANG Ai-xing

doi:10.13205/j.hjgc.202105024

Volume 39 Issue 5

Jan. 2022

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ZHANG Xiang-lu, LIU You-yan, LU Yu-hao, TANG Ai-xing. EXTRACELLULAR POLYMERIC SUBSTANCES OF ASPERGILLUS TUBINGENSIS AND BENTONITE PASSIVATION SOIL LEAD[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(5): 171-177,183. doi: 10.13205/j.hjgc.202105024

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ZHANG Xiang-lu, LIU You-yan, LU Yu-hao, TANG Ai-xing. EXTRACELLULAR POLYMERIC SUBSTANCES OF ASPERGILLUS TUBINGENSIS AND BENTONITE PASSIVATION SOIL LEAD[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(5): 171-177,183. doi: 10.13205/j.hjgc.202105024

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EXTRACELLULAR POLYMERIC SUBSTANCES OF ASPERGILLUS TUBINGENSIS AND BENTONITE PASSIVATION SOIL LEAD

doi: 10.13205/j.hjgc.202105024

1. College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;
2. Key Laboratory of Guangxi Biorefinery, Guangxi University, Nanning 530003, China

Received Date: 2020-03-27
Available Online: 2022-01-17

Abstract

Abstract

Passivation remediation technology has good advantages in remediation of low-concentration soil pollution due to its low investment, quick effect, and simple operation. The microbial extracellular polymeric substances (EPS) have excellent heavy metal adsorption capacity. The EPS solution was used to synergize bentonite to passivate the lead-contaminated soil. The effects of EPS dosage, acid rain treatment, and passivation treatment time on the passivation effect were investigated. The results showed that the adsorption capacity of EPS for lead (Ⅱ) was 241 mg/g. In the passivation experiment, as the amount of EPS increased, the passivation effect was firstly enhanced and then weakened. After adding bentonite, it could produce a synergistic passivation effect with EPS, which could increase the residue lead content by up to 59%. Both acid rain treatment and extended treatment time could increase the passivation effect. Various evaluation results for different pollution pathways showed that EPS and bentonite could effectively reduce the proportion of extractable lead in the soil.
- extracellular polymeric substances,
- lead,
- passivation,
- bentonite,
- chemical extraction method

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References(41)

References

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