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Operation performance and microbial community dynamics of phosphorus removal sludge with different electron acceptors.
- Source :
-
Journal of Industrial Microbiology & Biotechnology . Jul2014, Vol. 41 Issue 7, p1099-1108. 10p. - Publication Year :
- 2014
-
Abstract
- Operation performances of phosphorus removal sludge with different electron acceptors in three parallel SBRs were firstly compared in the present study, and the effect of post-aeration on denitrifying phosphorus removal was also studied. Moreover, community dynamics of different phosphorus removal sludge was systematically investigated with high-throughput sequencing for the first time. TP removal rates for nitrate-, nitrite-, and oxygen-based phosphorus removal sludge were 84.8, 78.5, and 87.4 %, with an average effluent TP concentration of 0.758, 0.931, and 0.632 mg/l. The average specific phosphorus release and uptake rates were 20.3, 10.8, and 21.5, and 9.43, 8.68, and 10.8 mgP/(gVSS h), respectively. Moreover, electron utilization efficiency of denitrifying phosphorus removal sludge with nitrate as electron acceptor was higher than nitrite, with P/e were 2.21 and 1.51 mol-P/mol-e, respectively. With the assistance of post-aeration for nitrate-based denitrifying phosphorus removal sludge, settling ability could be improved, with SVI decreased from 120 to 80 and 72 ml/g when post-aeration time was 0, 10, and 30 min, respectively. Moreover, further phosphorus removal could be achieved during post-aeration with increased aeration time. However, the anoxic phosphorus uptake was deteriorated, which was likely a result of shifted microbial community structure. Post-aeration of approximately 10 min was proposed for denitrifying phosphorus removal. Nitrate- and nitrite-based denitrifying phosphorus removal sludge exhibited similar community structure. More phosphorus accumulating organisms were enriched under anaerobic-aerobic conditions, while anaerobic-anoxic conditions were favorable for suppressing glycogen-accumulating organisms. Significant differences in pathogenic bacterial community profiles revealed in the current study indicated the potential public health hazards of non-aeration activated sludge system. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13675435
- Volume :
- 41
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Journal of Industrial Microbiology & Biotechnology
- Publication Type :
- Academic Journal
- Accession number :
- 96396412
- Full Text :
- https://doi.org/10.1007/s10295-014-1444-1