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dc.contributor.authorSarker, Dipok
dc.contributor.authorSathasivan, Arumugam
dc.contributor.authorJoll, Cynthia
dc.contributor.authorHeitz, Anna
dc.identifier.citationSarker, Dipok Chandra and Sathasivan, Arumugam and Joll, Cynthia and Heitz, Anna. 2013. Modelling temperature effects on ammonia-oxidising bacterial biostability in chloraminated systems. Science of the Total Environment. 454-455: pp. 88-98.

The biostability concept has been successfully used to predict the onset of nitrification in drinking water distribution systems, but in certain cases deficiencies have been observed in the predictions, indicating that modifications to parameters were needed. At the biostable disinfectant residual concentration (BRC), the rate of ammonia-oxidising bacterial (AOB) growth due to the substrate (free ammonia) and the rate of inactivation due to the disinfectant are balanced. Growth and inactivation rates vary greatly with temperature, but temperature is yet to be considered in the biostability equation. In this paper, two separate novel models are proposed which take into account the temperature effects on the biostability equation. First, a novel model of specific growth rate variability with temperature was shown to be valid for different bacterial species. Then, the biostability model was modified and validated for ammonia-oxidising bacterial activity using data collected from laboratory and full-scale distribution systems. The proposed model has two important uses: while the specific growth rate model and biostability model can be widely adopted for many microbes, the biostability model for AOB also has the potential to aid water utilities in disinfectant residual management throughout yearly temperature variations.

dc.subjectTemperature effects
dc.subjectFree ammonia
dc.subjectBiostability curve
dc.subjectAmmonia-oxidising bacteria
dc.titleModelling temperature effects on ammonia-oxidising bacterial biostability in chloraminated systems
dc.typeJournal Article
dcterms.source.titleScience of the Total Environment
curtin.accessStatusFulltext not available

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