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Ecology and performance of aerobic granular sludge treating high-saline municipal wastewater.
Water Sci Technol 2018; 77(3-4):1107-1114WS

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 differences when comparing different sized granules. In contrast to previous work, a large enrichment in PAOs in AGS was not observed in high-saline wastewater, which coincided with poor observed phosphate removal performance. Instead, AGS exhibited a substantial enrichment in sulfide-oxidising bacteria, which was complemented by elemental analysis that identified the presence of elemental sulfur precipitation. The potential role for these organisms in AGS treating high-saline wastewater is discussed.

Authors+Show Affiliations

School of Civil and Environmental Engineering, UNSW Australia, Sydney, NSW 2052, Australia E-mail: b.thwaites@student.unsw.edu.au.South Australian Water Corporation, Adelaide, South Australia 5000, Australia; School of Natural and Built Environments, University of South Australia, Mawson Lakes, South Australia 5095, Australia; Health and Environment Group, School of the Environment, Flinders University, Bedford Park, South Australia 5042, Australia.South Australian Water Corporation, Adelaide, South Australia 5000, Australia.School of Civil and Environmental Engineering, UNSW Australia, Sydney, NSW 2052, Australia E-mail: b.thwaites@student.unsw.edu.au; School of Natural and Built Environments, University of South Australia, Mawson Lakes, South Australia 5095, Australia; Future Industries Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia.South Australian Water Corporation, Adelaide, South Australia 5000, Australia.School of Civil and Environmental Engineering, UNSW Australia, Sydney, NSW 2052, Australia E-mail: b.thwaites@student.unsw.edu.au.School of Civil and Environmental Engineering, UNSW Australia, Sydney, NSW 2052, Australia E-mail: b.thwaites@student.unsw.edu.au.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29488974

Citation

Thwaites, Benjamin J., et al. "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, vol. 77, no. 3-4, 2018, pp. 1107-1114.
Thwaites BJ, van den Akker B, Reeve PJ, et al. Ecology and performance of aerobic granular sludge treating high-saline municipal wastewater. Water Sci Technol. 2018;77(3-4):1107-1114.
Thwaites, B. J., van den Akker, B., Reeve, P. J., Short, M. D., Dinesh, N., Alvarez-Gaitan, J. P., & Stuetz, R. (2018). 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, 77(3-4), pp. 1107-1114. doi:10.2166/wst.2017.626.
Thwaites BJ, et al. Ecology and Performance of Aerobic Granular Sludge Treating High-saline Municipal Wastewater. Water Sci Technol. 2018;77(3-4):1107-1114. PubMed PMID: 29488974.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ecology and performance of aerobic granular sludge treating high-saline municipal wastewater. AU - Thwaites,Benjamin J, AU - van den Akker,Ben, AU - Reeve,Petra J, AU - Short,Michael D, AU - Dinesh,Nirmala, AU - Alvarez-Gaitan,Juan Pablo, AU - Stuetz,Richard, PY - 2018/3/1/entrez PY - 2018/3/1/pubmed PY - 2018/8/16/medline SP - 1107 EP - 1114 JF - Water science and technology : a journal of the International Association on Water Pollution Research JO - Water Sci. Technol. VL - 77 IS - 3-4 N2 - 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 differences when comparing different sized granules. In contrast to previous work, a large enrichment in PAOs in AGS was not observed in high-saline wastewater, which coincided with poor observed phosphate removal performance. Instead, AGS exhibited a substantial enrichment in sulfide-oxidising bacteria, which was complemented by elemental analysis that identified the presence of elemental sulfur precipitation. The potential role for these organisms in AGS treating high-saline wastewater is discussed. SN - 0273-1223 UR - https://www.unboundmedicine.com/medline/citation/29488974/Ecology_and_performance_of_aerobic_granular_sludge_treating_high_saline_municipal_wastewater_ L2 - https://iwaponline.com/wst/article-lookup/doi/10.2166/wst.2017.626 DB - PRIME DP - Unbound Medicine ER -