Behaviour of cyanobacterial bloom material following coagulation and/or sedimentation

Research Article| September 01 2013 Behaviour of cyanobacterial bloom material following coagulation and/or sedimentation Lionel Ho; Lionel Ho 1Australian Water Quality Centre, SA Water Corporation, 250 Victoria Square, Adelaide, SA 5000, Australia E-mail: lionel.ho@sawater.com.au Search for other works by this author on: This Site PubMed Google Scholar Albane Barbero; Albane Barbero 1Australian Water Quality Centre, SA Water Corporation, 250 Victoria Square, Adelaide, SA 5000, Australia Search for other works by this author on: This Site PubMed Google Scholar Jennifer Dreyfus; Jennifer Dreyfus 1Australian Water Quality Centre, SA Water Corporation, 250 Victoria Square, Adelaide, SA 5000, Australia Search for other works by this author on: This Site PubMed Google Scholar David R. Dixon; David R. Dixon 2Department of Chemical & Biomolecular Engineering, The University of Melbourne, VIC 3010, Australia Search for other works by this author on: This Site PubMed Google Scholar Feng Qian; Feng Qian 2Department of Chemical & Biomolecular Engineering, The University of Melbourne, VIC 3010, Australia Search for other works by this author on: This Site PubMed Google Scholar Peter J. Scales; Peter J. Scales 2Department of Chemical & Biomolecular Engineering, The University of Melbourne, VIC 3010, Australia Search for other works by this author on: This Site PubMed Google Scholar Gayle Newcombe Gayle Newcombe 1Australian Water Quality Centre, SA Water Corporation, 250 Victoria Square, Adelaide, SA 5000, Australia Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2013) 62 (6): 350–358. https://doi.org/10.2166/aqua.2013.137 Article history Received: November 08 2012 Accepted: May 23 2013 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Cite Icon Cite Permissions Search Site Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll JournalsThis Journal Search Advanced Search Citation Lionel Ho, Albane Barbero, Jennifer Dreyfus, David R. Dixon, Feng Qian, Peter J. Scales, Gayle Newcombe; Behaviour of cyanobacterial bloom material following coagulation and/or sedimentation. Journal of Water Supply: Research and Technology-Aqua 1 September 2013; 62 (6): 350–358. doi: https://doi.org/10.2166/aqua.2013.137 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex The global increase in detection of cyanobacteria and their metabolites has prompted greater emphasis in optimizing water treatment options for their effective removal. In particular, conventional coagulation and clarification processes have been shown to be effective in removing whole cyanobacterial cells, and consequently a majority of the metabolites. However, the resultant cyanobacterial-laden sludge is often not closely monitored in treatment plants. This study has shown that the sludge supernatant derived from the coagulation/sedimentation of a range of natural cyanobacterial blooms contained extremely high concentrations of metabolites (up to ∼8,000 ng L–1 of geosmin and ∼90 μg L–1 of microcystins), which was attributed to cell lysis. Furthermore, the fate of the metabolites in the sludge supernatants differed with geosmin shown to be biodegradable, while the microcystins were released at different stages with some variants shown to be more persistent. The release and biodegradation of the metabolites followed pseudo-first-order kinetics with rate constants comparable to experiments using laboratory-cultured cyanobacteria. A key finding from this study was that the identification of cyanobacterial cell type is critical in making informed operational decisions, as not only did the cells behave differently within the sludge, but also the released metabolites behaved quite differently within the time frames studied. coagulation, cyanobacteria, cylindrospermopsin, geosmin, microcystin, sludge This content is only available as a PDF.