AI Article Synopsis
- The study examined how aging and phosphate levels impact biofilms in drinking water on a polycarbonate surface in a steady state.
- The researchers added excess phosphate, commonly used for corrosion control, and monitored various bacterial growth indicators over time.
- Results showed that after 7 weeks, a stable biofilm was formed with increased polysaccharides, constant total protein levels, but significant changes in individual amino acid profiles, while the added phosphate did not alter other biological metrics.
Article Abstract
The effects of ageing and of phosphate load on drinking water biofilms developed on a polycarbonate substratum in the pseudo-equilibrium state have been evaluated. Phosphate was added in an amount higher than the stochiometric nutrient requirements of bacteria, at concentrations commonly applied in a drinking water distribution system for corrosion control. Multiple parameters were monitored: heterotrophic plate counts (HPCs), total direct counts (TDCs) and potential exoproteolytic activity (PEPA) in order to characterise changes in bacterial biofilms. The total carbohydrate, amino acid and phosphate contents of biofilms were analysed to characterise and monitor the biochemical composition of the biofilm.The three enumeration methods showed that a pseudo-equilibrium state was reached after 7 weeks of colonisation after which, the bacterial growth rate in the biofilm was 0.1 log per week on average. Bulk phosphate addition doubled the phosphate in the biofilm, but did not affect the other biological, physiological or chemical parameters measured. Polysaccharides increased in the biofilm with ageing and the dynamics of individual carbohydrate synthesis also varied with the age of the biofilm. Once pseudo-equilibrium, it was found that the total proteins were globally constant, whereas the spectra of some individual amino acids of the proteins had significantly changed.
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| http://dx.doi.org/10.1016/S0043-1354(02)00476-1 | DOI Listing |
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