Retention and distribution of Cu, Pb, Cr, and Zn in a full-scale hybrid constructed wetland receiving municipal sewage

H.W. Xiao, S.L. Zhang, J. Zhai, Q. He, A.R. Mels, K.J. Ning, J. Liu

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

This study was conducted to investigate the retention and distribution of Cu, Pb, Cr, and Zn in a hybrid constructed wetland (CW) that consists of both vertical baffled flow wetlands (VBFWs) and horizontal subsurface flow wetlands (HSSFs) with unique flow regimes and oxygen distribution. The heavy metal concentrations in water, sediments, and plant tissues in the hybrid CW were analysed. The removal of heavy metals from the water stream in the monitoring period was not statistically significant. Metal concentrations in the sediments generally decreased along the wastewater treatment process. The reductive anaerobic condition in the VBFW may promote the sulphate reduction and form highly insoluble Cu, Pb, and Zn sulphides, resulting in the higher concentration of the bivalent cations in the VBFW sediments than the corresponding values in the HSSF; however, the aerobic and anoxic environments in the HSSF enhanced the removal of Cr with the co-precipitation of iron and manganese oxides, and their hydroxides. Metal concentrations in plant tissues were not significantly influenced by the concentrations in sediments, while roots contained statistically higher metal concentrations than stems and leaves. The sediments stored 94.01, 86.31, 95.85, and 89.51% of the total Cu, Pb, Cr, and Zn retained in the hybrid CW system, respectively, while only small fractions (
Original languageEnglish
Pages (from-to)2257-2264
JournalWater Science and Technology
Volume67
Issue number10
DOIs
Publication statusPublished - 2013

Keywords

  • waste water treatment
  • artificial wetlands
  • heavy metals
  • contaminated sediments
  • plant tissues
  • waste-water treatment
  • acid-mine drainage
  • heavy-metals
  • removal
  • performance
  • experience
  • decades
  • china

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