Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (4): 1182-1188.doi: 10.13278/j.cnki.jjuese.20180313

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Remediation of Cr(Ⅵ) Contaminated Groundwater by Stable and Loaded FeS

Hong Mei1,2, Ren Xuan1,2, Yang Huiping1,2   

  1. 1. College of New Energy and Environment, Jilin University, Changchun 130021, China;
    2. National Local Joint Engineering Laboratory of Petrochemical Pollution Site Control and Remediation Technology, Jilin University, Changchun 130021, China
  • Received:2018-11-28 Published:2020-07-29
  • Supported by:
    Supported by National Natural Science Foundation of China(41530636) and Major Scientific and Technological Projects on Water Pollution Control and Government(2018ZX07111001)

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Abstract: Nanometer iron sulfide (Nano-FeS) has small particle size, large specific surface and high reactivity, but its application in groundwater remediation is limited by its easy agglomeration and oxidation. The dispersion and stability of Nano-FeS can be improved by modification. In this study, two kinds of modifiers, sodium carboxymethyl cellulose (CMC) and pillared bentonite were used to prepare stable modified CMC-FeS and loaded Alb-FeS. The properties of the two modified Nano-FeS were investigated in terms of dispersivity, anti-sedimentation, anti-oxidation, reactivity,and migration. The results show that the dispersivity of Alb-FeS and CMC-FeS were improved obviously compared to Nano-FeS. After three days, Nano-FeS completely precipitated and oxidized, CMC-FeS precipitated 3 cm and began to oxidize, while Alb-FeS precipitated 16 cm without oxidation. Under the same experimental conditions, the removal rate of Alb-FeS,Nano-FeS, and CMC-FeS for Cr(Ⅵ) is 85.16%, 84.90%, and 82.78% respectively, and their removal ability is Alb-FeS > Nano-FeS > CMC-FeS. The migration ability of the three kinds of FeS in the medium of coarse sand, medium sand, and fine sand is CMC-FeS> Alb-FeS> Nano-FeS. The maximum migration distance of CMC-FeS in the three media is 6.1, 6.4 and 3.4 times of that of Nano-FeS, while the mobility of Alb-FeS is not significantly improved compared with that of Nano-FeS. Considering the dispersivity, anti-sedimentation, stability, reactivity, and migration, CMC-FeS should be selected as the in-situ remediation material for Cr (VI) contaminated groundwater in practical application.

Key words: iron sulfide, sodium carboxymethyl cellulose, hydroxyl aluminium pillared bentonite, reactivity, migration

CLC Number: 

  • X523
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