The aim of this study is to prepare biodegradable blend membranes of poly (butylene succinate)(PBS)/cellulose acetate (CA)/dextran (DEX). The effect of DEX concentration as an additive on morphology,porosity, hydrophilicity, mechanical strength, biodegradability, antifouling properties, and performanceof dairy wastewater treatment of the membranes was investigated. Results demonstrated that largerpores were formed in the membrane structure and the porosity of the membranes was remarkablyincreased by adding DEX concentration. Moreover, contact angle was reduced up to 16% with the increasein the DEX concentration from 0 to 2 wt.%. The presence of a larger amount of DEX increased the mem-brane degradation. Furthermore, the results of filtration tests showed that the amounts of pure water fluxand permeate flux of wastewater was improved by 154% and 1543%, respectively, by increasing the addi-tive concentration to 2 wt.%. The PBS/CA/DEX membranes displayed a superior antifouling performancecompared to the PBS/CA membrane.

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