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- W2350197528 abstract "The experiments of the nanofiltration (NF) of simulated carbonated solution with impermanent hardness were conducted with NF270 and NF_ membranes under 5 pH conditions of 6.0, 6.5, 7.0, 7.5 and 8.0. Under experimental conditions the operating pressure was 1.0?MPa, flowrate was 6? L·min -1 , and the sample temperature was 25℃, the flux of two membranes increased with the decrease of the pH of the feeding solution. The results indicated that the acidification to feeding solution could obtain higher flux during the filtration. In the experiments, the pH of the permeate liquid was always lower than the pH of the concentrate liquid, this meant the H+ was negative rejected, because the small positive H+ could easily permeate the NF membranes having small pores and negative charges. The negative rejection of H+ could results in the decomposition from HCO-_3 to CO 2- _3,and then accelerate CaCO_3 crystallization on membrane surface, which was unfavorable for the membrane performance. As the H+ is much more permeable through the NF membranes having more negative charges, the membrane selection and the pretreatment have to be considerated simultaneously in the NF softening. Selecting the membranes with less negative charges is beneficial for prevention of scaling on membrane surface when the water quality can meet the demands." @default.
- W2350197528 created "2016-06-24" @default.
- W2350197528 creator A5050304281 @default.
- W2350197528 date "2005-01-01" @default.
- W2350197528 modified "2023-09-23" @default.
- W2350197528 title "The negative rejection of H~+ observed in the NF of carbonate solution" @default.
- W2350197528 hasPublicationYear "2005" @default.
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