Abstract：
AIMS:In biosand filters (BSF), treatment is largely driven by the development of a biolayer (schmutzdecke) which establishes itself during the startup phase. In this study, the effect of changing influent total organic carbon (TOC) loading on the removal efficiency of Vibrio cholerae in laboratory-operated BSFs was quantified. METHODS AND RESULTS:BSFs were charged with high, medium or low TOC influents and removal efficacy and schmutzdecke composition was monitored over 2 months. The highest V. cholerae removal efficiencies were observed in the BSF receiving the lowest TOC. Schmutzdecke composition was found to be influenced by influent TOC, in terms of microbial community structure and amount of extracellular polymeric substance (EPS). CONCLUSIONS:Physical/chemical attachment was shown to be important during startup. The BSF receiving influent water with lower TOC had a higher attachment coefficient than the BSF receiving high TOC water, suggesting more physical/chemical treatment in the lower TOC BSF. The high TOC BSF had more EPS than did the biofilm from the low-TOC BSF, suggesting that schmutzdecke effects may be more significant at high TOC. SIGNIFICANCE AND IMPACT OF THE STUDY:Overall, this study confirms that influent water characteristics will affect BSF treatment efficacy of V. cholerae especially during the startup phase.
journal_name
J Appl Microbioljournal_title
Journal of applied microbiologyauthors
Danley-Thomson AA,Huang EC,Worley-Morse T,Gunsch CKdoi
10.1111/jam.13909subject
Has Abstractpub_date
2018-09-01 00:00:00pages
917-928issue
3eissn
1364-5072issn
1365-2672journal_volume
125pub_type
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