Phosphorus Concentration in Water Affects the Biofilm Community and the Produced Amount of Extracellular Polymeric Substances in Reverse Osmosis Membrane Systems
| Autor: | Laura Pulido-Beltran, Nadia Farhat, Johannes S. Vrouwenvelder, Joop C. Kruithof, Luisa Javier |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Process Chemistry and Technology
Phosphorus Chemical technology Membrane fouling Biofilm chemistry.chemical_element Filtration and Separation TP1-1185 Pulp and paper industry bacterial communities Desalination membrane cleaning reverse osmosis seawater desalination Article Biofouling phosphate limitation Extracellular polymeric substance Membrane Chemical engineering chemistry P limitation Chemical Engineering (miscellaneous) TP155-156 Reverse osmosis |
| Zdroj: | Membranes; Volume 11; Issue 12; Pages: 928 Membranes, Vol 11, Iss 928, p 928 (2021) Membranes, 11(12) Membranes |
| ISSN: | 2077-0375 |
| DOI: | 10.3390/membranes11120928 |
| Popis: | Biofouling is a problem that hinders sustainable membrane-based desalination and the stratification of bacterial populations over the biofilm’s height is suggested to compromise the efficiency of cleaning strategies. Some studies reported a base biofilm layer attached to the membrane that is harder to remove. Previous research suggested limiting the concentration of phosphorus in the feed water as a biofouling control strategy. However, the existence of bacterial communities growing under phosphorus-limiting conditions and communities remaining after cleaning is unknown. This study analyzes the bacterial communities developed in biofilms grown in membrane fouling simulators (MFSs) supplied with water with three dosed phosphorus conditions at a constant biodegradable carbon concentration. After biofilm development, biofilm was removed using forward flushing (an easy-to-implement and environmentally friendly method) by increasing the crossflow velocity for one hour. We demonstrate that small changes in phosphorus concentration in the feed water led to (i) different microbial compositions and (ii) different bacterial-cells-to-EPS ratios, while (iii) similar bacterial biofilm populations remained after forward flushing, suggesting a homogenous bacterial community composition along the biofilm height. This study represents an exciting advance towards greener desalination by applying non-expensive physical cleaning methods while manipulating feed water nutrient conditions to prolong membrane system performance and enhance membrane cleanability. |
| Databáze: | OpenAIRE |
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