The effects of repeated chemical cleaning of polyvinylidene flouid (PVDF) microfiltration (MF) and ultrafiltration (UF) membranes through the use of sodium hypochlonite is presented. The paper provides detailed data on the impacts to the chemical/physical characteristics of multiple membranes as a result of the cleaning at various doses and concent...

This paper documents a study intended to determine the impact of shear stress conditions on hollow fiber membrane fouling in natural waters, compare shear stress conditions and pre-coagulation on membrane fouling (separately and in combination), and compare the relative cost of shear stress conditions (sparging) and/or pre-coagulation with respect ...

PVDF based UF/MF membranes are susceptible to fouling and are generally cleaned using a chlorine-based solution. Exposer to sodium hypochlorite removes a portion of the hydrophilic additives from the membrane and making the membrane surface relatively less hydrophilic and more prone to fouling....

Study to evaluate how biofilm helps to degrade or retain foulants for flux stabilization and improve permeate quality....

The most widely applied pre-treatment to UF is coagulation, often to aggregate fractions of organic matter that cause fouling or those fractions that form disinfection by-products (DBPs) upon chlorination. Recent bench-scale studies have indicated that a low dose of coagulant (< 1 mg/L) is effective at reducing membrane fouling when considering sev...

Nanofiltration (NF) membranes represent a technology that is well suited for high-quality drinking water production from source waters with high concentrations of natural organic matter (NOM) or other contaminants. However, the application of these membranes is limited, mainly because of the challenges related to system complexity and cost. The aim...

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