COMPARISON OF ECOLOGICAL RISK ASSESSMENT OF HEAVY METALS IN DREDGED SEDIMENT TREATED BY DIFFERENT METHODS

MA Tao; SONG Jiang-min; LIU Qun-qun; SHENG Yan-qing

doi:10.13205/j.hjgc.202102023

Volume 39 Issue 2

Jul. 2021

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MA Tao, SONG Jiang-min, LIU Qun-qun, SHENG Yan-qing. COMPARISON OF ECOLOGICAL RISK ASSESSMENT OF HEAVY METALS IN DREDGED SEDIMENT TREATED BY DIFFERENT METHODS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(2): 141-146,152. doi: 10.13205/j.hjgc.202102023

Citation:

MA Tao, SONG Jiang-min, LIU Qun-qun, SHENG Yan-qing. COMPARISON OF ECOLOGICAL RISK ASSESSMENT OF HEAVY METALS IN DREDGED SEDIMENT TREATED BY DIFFERENT METHODS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(2): 141-146,152. doi: 10.13205/j.hjgc.202102023

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COMPARISON OF ECOLOGICAL RISK ASSESSMENT OF HEAVY METALS IN DREDGED SEDIMENT TREATED BY DIFFERENT METHODS

doi: 10.13205/j.hjgc.202102023

1. Yantai Institute of Coastal Zone Research, CAS, Yantai 264003, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2019-11-12
Available Online: 2021-07-19

Abstract

Abstract

Taking the sediment disposal demonstration project of Yihe River in Shandong province as an example, the ecological risks of sediment after three years of geo-textile tube landfill and reduction disposal were tracked to explore the effects of different disposal methods on the safety of heavy metals in sediments. The total concentrations and geochemical fractions of Cr, As, Zn, Cu, Cd, Pb, and Hg in sediments by the two disposal methods were analyzed. Meanwhile, their ecological risks and environmental safety were assessed by leaching toxicity method, risk assessment code (RAC), and potential ecological risk index method (PERI). The obtained results showed total concentrations of As, Cd, and Hg in sediments from two different disposal sites exceeded the risk screening value of the Soil Environmental Quality Risk Control Standard for Soil Contamination of Agricultural Land (GB 15618-2018). The geochemical fraction distribution of Zn and Hg in the sediments of the two sites was quite different, and the difference was mainly related to the differences of two disposal methods. The leaching toxicity test showed that the leaching toxicity of Cr, As, and Cu in geo-textile tube landfill was higher than that in reduction disposal, while the leaching toxity of Zn was on the contrary. According to the results of leaching toxicity, RAC, and PERI, the ecological risk of geo-textile tube landfill was relatively higher. In order to maximize the environmental and economic benefits, it was necessary to weigh all aspects of factors when choosing which way to treat the dredged sediments.
- dredging,
- sediment,
- heavy metal,
- ecological risk,
- geo-textile tube landfill,
- reduction disposal

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References(18)

References

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