Study on membrane fouling mechanism and separation performance during high-saline organic wastewater treatment with ultrafiltration
The treatment of high-saline organic wastewater is currently a major and challenging issue in the industry.Ultrafiltration technology has been prevalently employed to remove organic pollutants from high-saline organic wastewater,while the mechanism of ultrafiltration membrane fouling formation under high salinity is not clarified.Humic acid(HA)and bovine serum albumin(BSA)were used as representative organic pollutants to investigate the influences of high-saline conditions of NaCl,Na2SO4,and Na3PO4 on the formation of membrane fouling and separation effectiveness of organic substances.The results showed that the zeta potential and molecular sizes of HA and BSA were increased significantly due to the Na+electrostatic shielding effect.However,the anions weakened the shielding effect of Na+,with the stronger action exerted by the anions with higher valence state.All of the three high-saline conditions aggravated the formation of HA membrane fouling,while NaCl and Na2SO4 environments alleviated the membrane fouling formed by BSA.Substantial block-like particles appeared on the surface of membrane fouling layer,and the particle morphology tended to be more regular and uniform in size with the increased anion valence.The membrane rejection rates for organic pollutants decreased remarkably under high-saline environments,which indeed posed adverse impacts on the treatment of high-saline organic wastewater.
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