Formation of iron plaque on mangrove roots receiving wastewater and its role in immobilization of wastewater-borne pollutants

N. PI, N.F.Y. TAM, Ming Hung WONG

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Abstract

Iron (Fe) plaque formed on mangrove root increased with wastewater discharge, but the extent was species-specific. For Bruguiera gymnorrhiza, Fe plaque concentration was 0.80 mg g⁻¹ root d.wt at Day 0 and increased to 4.59, 6.84 and 7.52 mg g⁻¹ at Day 75 in the fresh water control (FW), synthetic wastewater with pollutant concentrations five times of municipal sewage (5SW) and double of 5SW (10SW) treatments, respectively; the respective increases in Excoecaria agallocha were from 0.70 to 2.37, 10.73 and 13.21 mg g⁻¹. For Acanthus ilicifolius, similar increase was found in 5SW, but all of the plants were dead in 10SW at Day 75. The concentrations of heavy metals and phosphorus immobilized were positively correlated with the amounts of Fe plaque formed, but the regression coefficients varied among species. The performance of mangrove plants in wastewater treatments was related to the Fe plaque formed and its immobilized wastewater-borne pollutants. Copyright © 2011 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)402-411
JournalMarine Pollution Bulletin
Volume63
Issue number5-12
DOIs
Publication statusPublished - 2011

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immobilization
mangrove
wastewater
Wastewater
pollutants
iron
Iron
pollutant
Excoecaria agallocha
Bruguiera gymnorhiza
Sewage
wastewater treatment
sewage
Wastewater treatment
Heavy metals
Phosphorus
heavy metals
heavy metal
phosphorus
Water

Citation

Pi, N., Tam, N. F. Y., & Wong, M. H. (2011). Formation of iron plaque on mangrove roots receiving wastewater and its role in immobilization of wastewater-borne pollutants. Marine Pollution Bulletin, 63(5-12), 402-411. doi: 10.1016/j.marpolbul.2011.05.036

Keywords

  • A. ilicifolius
  • B. gymnorrhiza
  • E. agallocha
  • Metals
  • Nutrients
  • Sewage