Inorganic Chemicals Industry >

2023 , Vol. 55 >Issue 6: 124 - 129

DOI: https://doi.org/10.19964/j.issn.1006-4990.2022-0453

Environment·Health·Safety

Effect of CaO on heavy metals stability and adsorption properties of sludge-derived biochar

  • TIAN Yuling ,
  • CHENG Yang ,
  • HAN Rong ,
  • ZHOU Mei ,
  • WANG Chengjie ,
  • GE Qiangru
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  • 1. School of Water and Environment，Chang′an University，Xi′an 710054，China
    2. Key Laboratory of Subsurface;Hydrology and Ecological Effects in Arid Region，Ministry of Education，Chang′an University，Xi′an 710054，China

Received date: 2022-07-27

  Online published: 2023-06-14

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Abstract

In view of the catalytic effect of CaO on gas production and tar reforming during biomass pyrolysis process，which can significantly improve the adsorption performance of biochar，the modified sludge derived biochar（BC-Ca） was prepared by co-pyrolysis of CaO and sewage sludge at a mass ratio of 1∶10.The effect of CaO on the characteristics of the sludge-derived biochar，as well as the speciation distribution of heavy metals（Pb，Zn，Cu，Cr，Mn） were investigated.The ecological risk of the biochar was assessed based on the risk assessment code（RAC）.The adsorption properties of the modified sludge derived biochar on Cr（Ⅵ） was evaluated by the static adsorption experiments.The results showed that compared with unmodified biochar（BC），the fraction of residual state（F4） of Zn，Pb，Cr，Mn，and Cu in BC-Ca were increased by 11.76%，13.03%，26.96%，5.55%，and 2.11%，respectively，which were all in a low risk condition according to the RAC standard.Compared with BC，the specific surface area of BC-Ca was increased by 122.99%，indicating that the microstructure performance of BC-Ca was improved.The adsorption behavior of BC-Ca for Cr（Ⅵ） was described by the Langmuir model and pseudo-second order dynamic sorption model，indicating that the adsorption capacity of BC-Ca was increased with increasing temperature，and the adsorption rate was mainly controlled by chemical adsorption mechanism.The maximum adsorption capacity of BC-Ca for Cr（Ⅵ） was improved by 51.13% than that of BC，showing outstanding removal effect on Cr（Ⅵ）.

Key words： sludge-derived biochar; heavy metal stability; ecological risk; Cr（Ⅵ） adsorption

Cite this article

TIAN Yuling , CHENG Yang , HAN Rong , ZHOU Mei , WANG Chengjie , GE Qiangru . Effect of CaO on heavy metals stability and adsorption properties of sludge-derived biochar[J]. Inorganic Chemicals Industry, 2023 , 55(6) : 124 -129 . DOI: 10.19964/j.issn.1006-4990.2022-0453

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