Anaerobic biodegradation of PAHs in mangrove sediment with amendment of NaHCO3

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Chun-Hua Li
  • Yuk-Shan Wong
  • Hong-Yuan Wang
  • Nora Fung-Yee Tam

Detail(s)

Original languageEnglish
Pages (from-to)148-156
Journal / PublicationJournal of Environmental Sciences (China)
Volume30
Online published27 Jan 2015
Publication statusPublished - 1 Apr 2015

Abstract

Mangrove sediment is unique in chemical and biological properties. Many of them suffer polycyclic aromatic hydrocarbon (PAH) contamination. However, the study on PAH biological remediation for mangrove sediment is deficient. Enriched PAH-degrading microbial consortium and electron acceptor amendment are considered as two effective measures. Compared to other electron acceptors, the study on CO2, which is used by methanogens, is still seldom. This study investigated the effect of NaHCO3 amendment on the anaerobic biodegradation of four mixed PAHs, namely fluorene (Fl), phenanthrene (Phe), fluoranthene (Flua) and pyrene (Pyr), with or without enriched PAH-degrading microbial consortium in mangrove sediment slurry. The trends of various parameters, including PAH concentrations, microbial population size, electron-transport system activities, electron acceptor and anaerobic gas production were monitored. The results revealed that the inoculation of enriched PAH-degrading consortium had a significant effect with half lives shortened by 7-13days for 3-ring PAHs and 11-24days for 4-ring PAHs. While NaHCO3 amendment did not have a significant effect on the biodegradation of PAHs and other parameters, except that CO2 gas in the headspace of experimental flasks was increased. One of the possible reasons is that mangrove sediment contains high concentrations of other electron acceptors which are easier to be utilized by anaerobic bacteria, the other one is that the anaerobes in mangrove sediment can produce enough CO2 gas even without adding NaHCO3..

Research Area(s)

  • Anaerobic biodegradation, Electron acceptor amendment, Mangrove sediment, NaHCO<inf>3</inf> amendment, Polycyclic aromatic hydrocarbon

Citation Format(s)

Anaerobic biodegradation of PAHs in mangrove sediment with amendment of NaHCO3. / Li, Chun-Hua; Wong, Yuk-Shan; Wang, Hong-Yuan; Tam, Nora Fung-Yee.

In: Journal of Environmental Sciences (China), Vol. 30, 01.04.2015, p. 148-156.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal