TY - JOUR
T1 - Effect of Mn(IV) on the biodegradation of polycyclic aromatic hydrocarbons under low-oxygen condition in mangrove sediment slurry
AU - Li, Chun Hua
AU - Ye, Chun
AU - Wong, Yuk Shan
AU - Tam, Nora Fung Yee
N1 - Funding Information:
The research described in this paper was supported by a grant from the Strategic Research Grant of the City University of Hong Kong (Project No.: 7002365). The authors would like to thank PhD student Qingtan Gao and Haowen Zhu for their assistance in sediment sampling.
PY - 2011/6/15
Y1 - 2011/6/15
N2 - This study investigated the effect of manganese [Mn(IV)] amendment on the anaerobic biodegradation of four mixed PAHs, namely fluorene (Fl), phenanthrene (Phe), fluoranthene (Flua) and pyrene (Pyr) under low-oxygen condition, with and without the inoculation of enriched PAH-degrading bacterial consortia, in mangrove sediment slurries. The results revealed that the addition of Mn(IV) significantly inhibited PAH biodegradation, the rate of which was about 31-70% lower than the one of the groups without Mn(IV) addition. The amendment of Mn(IV) also showed adverse effect on the population size of enriched PAH-degrading bacteria and bacterial activity. The analysis results on the concentrations of Mn(II) and Mn(IV) indicated that Mn(IV) was converted to Mn(II) fast, the latter was the predominate manganese form in the mangrove sediment slurries through the whole experimental period. The Mn(II) toxicity to microorganisms was considered the main reason for inhibition of the PAH-biodegradation. On the other hand, the inoculation of the enriched PAH-degrading consortia significantly enhanced the biodegradation rates of all four PAHs, and the biodegradation rates of 3-rings (Fl, Phe) and 4-rings (Flua, Pyr) PAHs were enhanced by 14-15% and 21-34%, respectively.
AB - This study investigated the effect of manganese [Mn(IV)] amendment on the anaerobic biodegradation of four mixed PAHs, namely fluorene (Fl), phenanthrene (Phe), fluoranthene (Flua) and pyrene (Pyr) under low-oxygen condition, with and without the inoculation of enriched PAH-degrading bacterial consortia, in mangrove sediment slurries. The results revealed that the addition of Mn(IV) significantly inhibited PAH biodegradation, the rate of which was about 31-70% lower than the one of the groups without Mn(IV) addition. The amendment of Mn(IV) also showed adverse effect on the population size of enriched PAH-degrading bacteria and bacterial activity. The analysis results on the concentrations of Mn(II) and Mn(IV) indicated that Mn(IV) was converted to Mn(II) fast, the latter was the predominate manganese form in the mangrove sediment slurries through the whole experimental period. The Mn(II) toxicity to microorganisms was considered the main reason for inhibition of the PAH-biodegradation. On the other hand, the inoculation of the enriched PAH-degrading consortia significantly enhanced the biodegradation rates of all four PAHs, and the biodegradation rates of 3-rings (Fl, Phe) and 4-rings (Flua, Pyr) PAHs were enhanced by 14-15% and 21-34%, respectively.
KW - Biodegradation
KW - Low-oxygen condition
KW - Mangrove sediment
KW - Mn(IV) amendment
KW - Polycyclic aromatic hydrocarbon (PAH)
UR - http://www.scopus.com/inward/record.url?scp=79956067279&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2011.03.121
DO - 10.1016/j.jhazmat.2011.03.121
M3 - Article
C2 - 21514997
AN - SCOPUS:79956067279
SN - 0304-3894
VL - 190
SP - 786
EP - 793
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -