In situ remediation and phytotoxicity assessment of lead-contaminated soil by biochar-supported nHAP

Zhangmei YANG, Zhanqiang FANG, Po Keung Eric TSANG, Jianzhang FANG, Dongye ZHAO

Research output: Contribution to journalArticles

22 Citations (Scopus)

Abstract

In this study, a kind of biochar-supported nano-hydroxyapatite (nHAP@BC) material was used in in-situ remediation of lead-contaminated soil. Column experiments were performed to compare the mobility of nHAP@BC and Bare-nHAP. The immobilization, accumulation and toxic effects of Pb in the after-amended soil were assessed by the in vitro toxicity tests and pot experiments. The column experiments showed a significant improvement in the mobility of nHAP@BC. The immobilization rate of Pb in the soil was 74.8% after nHAP@BC remediation. Sequential extraction procedures revealed that the residual fraction of Pb increased by 66.6% after nHAP@BC remediation, which greatly reduced the bioavailability of Pb in the soil. In addition, pot experiments indicated that nHAP@BC could effectively reduce the upward translocation capacity of Pb in a soil-plant system. The concentration of Pb in the aerial part of the cabbage mustard was 0.1 mg/kg, which is lower than the tolerance limit (0.3 mg/kg). nHAP@BC can remediate Pb-contaminated soil effectively, which can restore soil quality for planting. Copyright © 2016 Elsevier Ltd.
Original languageEnglish
Pages (from-to)247-251
JournalJournal of Environmental Management
Volume182
Early online dateJul 2016
DOIs
Publication statusPublished - Nov 2016

Citation

Yang, Z., Fang, Z., Tsang, P. E., Fang, J., & Zhao, D. (2016). In situ remediation and phytotoxicity assessment of lead-contaminated soil by biochar-supported nHAP. Journal of Environmental Management, 182, 247-251.

Keywords

  • Lead-contaminated soil
  • In-situ remediation
  • nHAP@BC
  • Mobility
  • Phytotoxicity

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