Membrane fouling control in ultrafiltration treatment of containing algal water with pre-mixing and pre-deposition MIEX
In order to reduce the membrane fouling of algal water treated by ultrafiltration,the pre-mixed and pre-deposit-ed magnetic ion exchange resin(MIEX)on algal fouling control was studied.The total resistance,reversible re-sistance and irreversible resistance in this study were analyzed,and the membrane fouling mechanism was stud-ied by scanning electron microscope,three-dimensional fluorescence spectrum,irreversible pollution compo-nent and ultrafiltration model.The results showed that under the same dosage,the membrane fouling control of pre-deposited MIEX was better than that of pre-mixed MIEX.The best control of membrane fouling was achieved at the maximum pre-deposited amount of 235.2 mL/m2,then the total resistance,reversible resistance and irre-versible resistance of pre-deposited MIEX are 52.7％,65.7％and 50.1％lower than the corresponding values of pre-mixed MIEX,respectively.Both proteins were the main cause of irreversible resistance for both dosing strategies.the thickness of the algal cake layer decreased from 4.82 m to 4.07 m with the increase of pre-mixed dosages,and the content of algal cells and extracellular organic matter(EOM)in the algal cake layer decreased.In the pre-deposited MIEX,the morphology of the sediment layer changed with the increase of the dosage of MIEX,and when the dosage was maximum,the sediment layer intercepted more algal cells and EOM,forming an obvious algal filter cake layer.
万方数据
维普
