Ecology and performance of aerobic granular sludge treating high-saline municipal wastewater

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Benjamin J ThwaitesRichard Stuetz

Abstract

The successful development of aerobic granular sludge (AGS) for secondary wastewater treatment has been linked to a dedicated anaerobic feeding phase, which enables key microbes such as poly-phosphate-accumulating organisms (PAOs) and glycogen-accumulating organisms to gain a competitive advantage over floc-forming organisms. The application of AGS to treat high-saline sewage and its subsequent impacts on microbial ecology, however, are less well understood. In this study, the impacts of high-saline sewage on AGS development, performance and ecology were investigated using molecular microbiology methods. Two feeding strategies were compared at pilot scale: a full (100%) anaerobic feed; and a partial (33%) anaerobic feed. The results were compared to a neighbouring full-scale conventional activated sludge (CAS) system (100% aerobic). We observed that AGS developed under decreased anaerobic contact showed a comparable formation, stability and nitrogen removal performance to the 100% anaerobically fed system. Analysis of the microbial ecology showed that the altered anaerobic contact had minimal effect on the abundances of the functional nitrifying and denitrifying bacteria and Archaea; however, there were notable ecological diffe...Continue Reading

References

Apr 26, 2005·Biotechnology and Bioengineering·M K de KreukM C M van Loosdrecht
May 11, 2012·Applied Microbiology and Biotechnology·Mari K H WinklerMark C M van Loosdrecht
Nov 6, 2012·Water Research·M-K H WinklerM C M van Loosdrecht
Apr 22, 2015·Journal of Environmental Management·Ben van den AkkerJoerg Krampe
Feb 11, 2016·Journal of Environmental Management·Petra J ReeveBen van den Akker

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