TY - JOUR
T1 - Performance of flocs and biofilms in integrated fixed-film activated sludge (IFAS) systems for the treatment of oil sands process-affected water (OSPW)
AU - Huang, Chunkai
AU - Shi, Yijing
AU - Gamal El-Din, Mohamed
AU - Liu, Yang
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - This study evaluated the roles of suspended flocs and attached biofilms from integrated fixed-film activated sludge (IFAS) systems in their overall contribution toward organic compound removal in oil sands process-affected water (OSPW). The batch experiments were operated with suspended flocs and biofilm carriers from our continuous laboratory-scale IFAS reactors for the OSPW treatment. A distinct difference between IFAS flocs and biofilms for the chemical oxygen demand (COD), ammonium and acid extractable fraction (AEF) removal was demonstrated. Compared to the biofilms, the flocs demonstrated considerably higher removal rates for COD and ammonium, whereas, biofilms had better performance on the AEF removal than flocs. Meanwhile, the results also revealed that the biodegradation was the principal removal mechanism whereas, the biosorption contributed little to the OSPW organic compounds and the ammonium removals in the IFAS system. Microbial analysis from q-PCR revealed that the abundances of nitrifiers and denitrifiers genes were significantly higher in flocs than in biofilms in both raw and ozonated-OSPW IFAS reactors. The microbial communities analysis from MiSeq sequencing showed that Proteobacteria, Acidobacteria, Nitrospirae and Bacteroidetes were dominant phyla in both flocs and biofilms.
AB - This study evaluated the roles of suspended flocs and attached biofilms from integrated fixed-film activated sludge (IFAS) systems in their overall contribution toward organic compound removal in oil sands process-affected water (OSPW). The batch experiments were operated with suspended flocs and biofilm carriers from our continuous laboratory-scale IFAS reactors for the OSPW treatment. A distinct difference between IFAS flocs and biofilms for the chemical oxygen demand (COD), ammonium and acid extractable fraction (AEF) removal was demonstrated. Compared to the biofilms, the flocs demonstrated considerably higher removal rates for COD and ammonium, whereas, biofilms had better performance on the AEF removal than flocs. Meanwhile, the results also revealed that the biodegradation was the principal removal mechanism whereas, the biosorption contributed little to the OSPW organic compounds and the ammonium removals in the IFAS system. Microbial analysis from q-PCR revealed that the abundances of nitrifiers and denitrifiers genes were significantly higher in flocs than in biofilms in both raw and ozonated-OSPW IFAS reactors. The microbial communities analysis from MiSeq sequencing showed that Proteobacteria, Acidobacteria, Nitrospirae and Bacteroidetes were dominant phyla in both flocs and biofilms.
KW - Biofilms
KW - Flocs
KW - Illumina high-throughput sequencing
KW - Integrated fixed-film activated sludge (IFAS)
KW - Oil sands process-affected water (OSPW)
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U2 - 10.1016/j.cej.2016.11.151
DO - 10.1016/j.cej.2016.11.151
M3 - Article
AN - SCOPUS:85028268721
SN - 1385-8947
VL - 314
SP - 368
EP - 377
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -