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Sitterley, Kurban A.; Cath, Tani J.; Jenne, Dale S.; Yu, Yi-Hsiang; Cath, Tzahi Y.
Desalination, 04/2022, Letnik: 527Journal Article
Wave-driven desalination systems are proposed water treatment systems that involve reverse osmosis of seawater powered directly by wave motion. Such a configuration would result in drastic feed pressure fluctuations. For a technology conventionally operated with a constant feed condition, the effect of these variable pressures on membrane integrity and performance is unknown. Experiments were conducted with spiral wound membranes coupled to a system capable of producing feed pressure fluctuations of more than 400 psi. Feed composition included 5, 20, and 35 g/L NaCl, and a synthetic seawater at normal and 1.5× concentration. The variable feed conditions included sine-like pressure waves swings of 200–500 and 500–900 psi with frequencies of 1.25, 7.5, and 12 waves/min, and a model-generated random waveform. Between each wave experiment we performed membrane integrity tests at 650 psi and 25 g/L NaCl feed, which showed a 7.4% drop in the membrane's water permeability coefficient, an 18.4% flux decline, and more than 99% salt rejection over 1770 h of cumulative experimental time. Analysis of permeate samples showed high salt rejection. In general, variable feed pressure had no significant deleterious effect on membrane integrity or performance. Display omitted •Impact of large feed pressure variations on membrane integrity was investigated.•Permeability showed no substantial decline over 1800 h of dynamic feed pressure.•Permeate water quality did not deviate from expectations under dynamic operation.
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