PASSIVATION AND REMEDIATION OF MERCURY CONTAMINATED SOIL BY POLYMER AND PASSIVATOR

YU Gao; CHEN Fen; ZHAO Cheng-gang; HOU Jian-wei; DENG Xiao-mei

doi:10.13205/j.hjgc.202104026

Volume 39 Issue 4

Jul. 2021

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YU Gao, CHEN Fen, ZHAO Cheng-gang, HOU Jian-wei, DENG Xiao-mei. PASSIVATION AND REMEDIATION OF MERCURY CONTAMINATED SOIL BY POLYMER AND PASSIVATOR[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(4): 174-179,186. doi: 10.13205/j.hjgc.202104026

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PASSIVATION AND REMEDIATION OF MERCURY CONTAMINATED SOIL BY POLYMER AND PASSIVATOR

doi: 10.13205/j.hjgc.202104026

College of A&F Engineering and Planning, Tongren University, Tongren 554300, China

Received Date: 2020-03-18
Available Online: 2021-07-21

Abstract

Abstract

A pot experiment was carried out to study the effects of adding high polymer with strong acid resistance and traditional organic or inorganic passivator to passivate the heavy metal mercury in soil, and to explore its effect on the physical and chemical properties of soil, the growth of plants, the form of mercury in soil and the activity of enzyme. The results showed that:compared with CK, adding different passivators could effectively improve the physical and chemical conditions of mercury contaminated soil and soil microenvironment, and promote plant growth. Compared with CK, the proportion of available mercury in soil was significantly reduced by different passivators, and the ratio of water-soluble and exchangeable mercury in soil decreased by 106%~315% and 12.61%~34.60%, respectively. Compared with single passivator, the bonding passivator with polymer could effectively adsorb and fix mercury, and reduce the bioavailability of heavy metal mercury in soil. The biochar polyacrylamide (BI-PAM)treatment had the best effect on soil organic matter content and pH, and the best passivation effect on heavy metal mercury in soil(water soluble mercury, exchangeable mercury and Fe-Mn oxide bound mercury accounted for the smallest proportion of total mercury, which were 1.05%, 12.14% and 12.72% respectively, while strong organic bound mercury and residual mercury accounted for the highest proportion, which were 15.86% and 58.23% respectively), which could promote the yield and reduce the absorption and enrichment of mercury in cabbage leaves. According to the experimental results, the bonding passivator of biochar and polyacrylamide was recommended in application in acid soil polluted by mercury.
- mercury contaminated soil,
- passivator,
- PAM,
- mercury form,
- soil enzyme activity

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References

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