Volume 10 Issue 4
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Article Navigation >  Journal of Environmental Engineering Technology  > 2020  >  10(4): 661-670
CAO Jing, WANG Pengfei, CHEN Junyi, WANG Shuhang, YANG Guoli. Study on the effect of modified biochar materials on in situ remediation of contaminated sediments[J]. Journal of Environmental Engineering Technology, 2020, 10(4): 661-670. doi: 10.12153/j.issn.1674-991X.20200021
Citation: CAO Jing, WANG Pengfei, CHEN Junyi, WANG Shuhang, YANG Guoli. Study on the effect of modified biochar materials on in situ remediation of contaminated sediments[J]. Journal of Environmental Engineering Technology, 2020, 10(4): 661-670. doi: 10.12153/j.issn.1674-991X.20200021
shu

Study on the effect of modified biochar materials on in situ remediation of contaminated sediments

doi: 10.12153/j.issn.1674-991X.20200021
  • 1.

    School of Municipal and Environmental Engineering, Hebei University of Architectural Engineering

  • 2.

    Institute of Lake Environment, Chinese Research Academy of Environmental Sciences

  • 3.

    National Engineering Laboratory for Lake Pollution Control and Ecological Restoration

More Information
  • Corresponding author: WANG Pengfei E-mail: wangpf01@craes.org.cn
  • Received Date: 2020-02-17
  • Publish Date: 2020-07-20
    Abstract
  • To study the control effect of biochar material on the release of nitrogen, phosphorus and heavy metal pollutants, two kinds of polluted sediment samples were collected from the river network and lake in Jiaxing City. Four kinds of modified biochars were produced using reed as the biomass feedstock and FeCl3, AlCl3, MgCl2 and KMnO4 as modifiers, while unmodified biochar, activated carbon and Phoslock were used as reference materials. The control effects of the seven kinds of remediation materials on the release of ammonia nitrogen (NH3-N), nitrate nitrogen ( NO 　 3 - -N) and total soluble nitrogen (DTN), orthophosphate ( P O 4 3 - -P), total soluble phosphorus (DTP) and heavy metal ions into the water from the two kinds of polluted sediments were analyzed. The results showed that after adding AlCl3 modified biochar to the sediments, the concentrations of NH3-N, DTN, P O 4 3 - -P, DTP, Ni, As released into the water from the two sediments could be reduced by 17.42%, 18.61%, 91.23%, 77.04%, 72.13%, 46.21%, respectively, at the most. After adding FeCl3 modified biochar, the concentrations of P O 4 3 - -P, DTP and As released into the water from the two sediments could be decreased by 91.23%, 92.59% and 95.80%, respectively, but the concentrations of DTN and Ni in the water increased. After adding MgCl2 and KMnO4 modified biochar, the concentrations of nitrogen, phosphorus, Ni and As pollutants released into the water from the two sediments increased rather than decreased. In conclusion, AlCl3 modified biochar could effectively fix phosphorus, Ni and As in sediments and thus be considered as a material for in situ remediation of contaminated sediment.

     

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