부산대학교 도서관

Effluent from the secondary treatmentof municipal wastewater wastreated with membrane filtration to reduce its toxicity. Five differentinorganic membranes were tested, namely, an α-alumina microfiltrationmembrane, an anatase titania ultrafiltration membrane, a γ-aluminananofiltration membrane, an amorphous titania nanofiltration membrane,and an amorphous hybrid organo-silica membrane. The permeabilitiesand selectivities (color, UV254-absorbing components, conductivityand inorganic nitrogen compounds) of the membranes were determined,and the γ-alumina nanofiltration membrane was found to be themost promising membrane for the treatment of the effluent. The effluentflux was measured to be approximately 40 L m–2h–1for the γ-alumina nanofiltration membrane,and it removed nearly 75% of the UV254-absorbing componentsand 15% of the ions. It also removed 40% of the CuCl and 25% of theCuSO4from the spiked effluent. The fouling resistancewas less pronounced for the γ-alumina membrane compared withthe other membranes. The removal of fecal indicator bacteria was determinedby measuring the amounts of Escherichia coliand Enterococci, and the removalof toxic compounds was investigated in bioassays with Daphnia magnaand Aliivibrio fischeri. The γ-alumina nanofiltration membrane reduced the wastewaterconcentration of E. coli(97.3%) and Enterococci(98.4%), and the bioassays demonstratedthat filtration with the γ-alumina nanofiltration membrane reducedthe overall toxicity of the effluent. [ABSTRACT FROM AUTHOR]