Effect of phosphate availability on biofilm formation in cooling towers.

Autor: Pinel ISM; Department of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, Delft, The Netherlands., Kim LH; Division of Biological and Environmental Science and Engineering (BESE), Water Desalination and Reuse Center (WDRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia., Proença Borges VR; Division of Biological and Environmental Science and Engineering (BESE), Water Desalination and Reuse Center (WDRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia., Farhat NM; Division of Biological and Environmental Science and Engineering (BESE), Water Desalination and Reuse Center (WDRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia., Witkamp GJ; Division of Biological and Environmental Science and Engineering (BESE), Water Desalination and Reuse Center (WDRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia., van Loosdrecht MCM; Department of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, Delft, The Netherlands., Vrouwenvelder JS; Department of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, Delft, The Netherlands.; Division of Biological and Environmental Science and Engineering (BESE), Water Desalination and Reuse Center (WDRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.
Jazyk: angličtina
Zdroj: Biofouling [Biofouling] 2020 Aug; Vol. 36 (7), pp. 800-815. Date of Electronic Publication: 2020 Sep 04.
DOI: 10.1080/08927014.2020.1815011
Abstrakt: Phosphate limitation has been suggested as a preventive method against biofilms. P-limited feed water was studied as a preventive strategy against biofouling in cooling towers (CTs). Three pilot-scale open recirculating CTs were operated in parallel for five weeks. RO permeate was fed to the CTs (1) without supplementation (reference), (2) with supplementation by biodegradable carbon (P-limited) and (3) with supplementation of all nutrients (non-P-limited). The P-limited water contained ≤10 µg PO 4 l -1 . Investigating the CT-basins and coupons showed that P-limited water (1) did not prevent biofilm formation and (2) resulted in a higher volume of organic matter per unit of active biomass compared with the other CTs. Exposure to external conditions and cycle of concentration were likely factors that allowed a P concentration sufficient to cause extensive biofouling despite being the limiting compound. In conclusion, phosphate limitation in cooling water is not a suitable strategy for CT biofouling control.
Databáze: MEDLINE
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