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• W2770129505 abstract "Real water pH and ionic strength vary greatly, which influences the performance of membrane processes such as nanofiltration (NF) and reverse osmosis (RO). Systematic variation of pH (3 − 12) and ionic strength (2–10 g/L as total dissolved solids (TDS)) was undertaken with a real Tanzanian water to investigate how water quality affects retention mechanisms of fluoride (F) and natural organic matter (NOM). An autonomous solar powered NF/RO system driven by a solar array simulator was supplied with constant power from a generator. An open NF (NF270) and a brackish water RO (BW30) membrane were used. A surface water with a very high F (59.7 mg/L) and NOM (110 mgC/L) was used. Retention of F by NF270 was < 20% at pH < 6, increased to 40% at pH 6, and 60–70% at pH 7–12, indicating a dominance of charge repulsion while being ineffective in meeting the guideline of 1.5 mg/L. Increase in ionic strength led to a significant decline in retention of F (from 70 to 50%) and electrical conductivity (from 60 to 10%) by NF270, presumably due to charge screening. In contrast, BW30 retained about 50% of F at pH 3, > 80% at pH 4, and about 99% at pH > 5, due to the smaller pore size and hence a more dominant size exclusion. In consequence, only little impact of ionic strength increase was observed for BW30. The concentration of NOM in permeates of both NF270 and BW30 were typically < 2 mg/L. This was not affected by pH or ionic strength due to the fact that the bulk of NOM was rejected by both membranes through size exclusion. The research is carried out in the context of providing safe drinking water for rural and remote communities where infrastructure is lacking, and water quality varies significantly. While other studies focus on energy fluctuations, this research emphasises on feed water quality that affects system performance and may alter due to a number of environmental factors." @default.
• W2770129505 created "2017-12-04" @default.
• W2770129505 creator A5013743534 @default.
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• W2770129505 date "2018-04-01" @default.
• W2770129505 modified "2023-10-18" @default.
• W2770129505 title "Renewable energy powered membrane technology: Impact of pH and ionic strength on fluoride and natural organic matter removal" @default.
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• W2770129505 doi "https://doi.org/10.1016/j.scitotenv.2017.11.111" @default.
• W2770129505 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29179069" @default.
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