EFFECT OF REDOX CONDITION AND MICROBIAL ACTION ON HEAVY METALS TRANSFORMATION IN RESERVOIR SEDIMENTS

ZHANG Yaning; ZHU Weihuang; DONG Ying; WU Xijun; LIU Jing

doi:10.13205/j.hjgc.202306014

Volume 41 Issue 6

Jun. 2023

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ZHANG Yaning, ZHU Weihuang, DONG Ying, WU Xijun, LIU Jing. EFFECT OF REDOX CONDITION AND MICROBIAL ACTION ON HEAVY METALS TRANSFORMATION IN RESERVOIR SEDIMENTS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 101-108. doi: 10.13205/j.hjgc.202306014

Citation:

ZHANG Yaning, ZHU Weihuang, DONG Ying, WU Xijun, LIU Jing. EFFECT OF REDOX CONDITION AND MICROBIAL ACTION ON HEAVY METALS TRANSFORMATION IN RESERVOIR SEDIMENTS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 101-108. doi: 10.13205/j.hjgc.202306014

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EFFECT OF REDOX CONDITION AND MICROBIAL ACTION ON HEAVY METALS TRANSFORMATION IN RESERVOIR SEDIMENTS

doi: 10.13205/j.hjgc.202306014

1. Yulin University, School of Civil Engineering, Yulin 719000, China;
2. Key Laboratory of Northwest Water Resources Environment and Ecology of Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China

Received Date: 2022-07-28
Available Online: 2023-09-02

Abstract

Abstract

In order to explore the migration and transformation mechanism of heavy metals between sediment and water interface, we took the surface sediment of a reservoir in Northwest China as the research object. By controlling redox conditions, an indoor simulation experiment was designed including heat sterilization and adding carbon sources to the sediments. It was found that after 28 days of aerobic cultivation, the concentration of six heavy metals in the overlying water decreased by 46.3%~100%, and the total content of heavy metals in the sediment all increased; the content of active form of the six heavy metals decreased, and the content of residual form increased, especially the ratio of residual form content to total amount of Cd and Pb (R/T) increased by 33.32% and 16.11% respectively, compared with the original sample; under anaerobic condition, the trend of concentration change was opposite, and the concentration of Pb in the overlying water was 2.36 times higher than the initial one. Under the action of microorganisms, the concentration of six heavy metals in the overlying water was lower than that of the high-temperature sterilization treatment, while the total amount of heavy metals in the sediment was increased. At the same time, the R/T values of six heavy metals, after adding carbon source, were higher than those of sterilization treatment. This indicated that microbial activity can immobilize heavy metals, causing them to migrate from overlying water to sediments, and converting active states into low-risk residual states, thereby reducing the toxicity of heavy metals to human health. Therefore, increasing the dissolved oxygen content and microbial population in reservoirs played an important role in reducing the activity of heavy metals in sediments, enriching and fixing heavy metals.
- heavy metals,
- redox condition,
- sterilization,
- sediments,
- the overlying water

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References(26)

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