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Cellulose acetate-starch membranes were prepared via phase inversion method while glycerol was added as a plasticizer additive. Effects of total polymer, starch and glycerol concentrations besides the coagulation bath temperature on thickness, contact angle, permeability and biodegradability of the membranes were investigated based on Taguchi experimental design. The interactions between polymers and the membranes morphology were evaluated using Fourier-transform infrared and scanning electron microscopy, respectively. Three concentration factors were found to be effective parameters in changing the membranes thickness and permeability. The membranes hydrophilicity was affected by total polymer and starch concentration, while their biodegradability was only influenced by the starch concentration.

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Polyethersulfone (PES) was blended with poly(D,L-lactide) (PDLLA) to prepare asymmetric membranes using the phase inversion method. The effects of the blend ratios and poly(ethylene glycol) (PEG) as additive on the membrane structure, properties, and performance were investigated. The membranes were characterized by contact angle determination, scanning electron microscopy, porosity measurement, thermogravimetric analysis, degradation tests in compost, and dynamic tests for pure water flux and bakery product wastewater treatment. PES and PEG slightly reduced the membrane contact angle. Increasing the PDLLA concentration in the blend membranes enhanced the membrane degradation in compost and also the membrane porosity. The permeate flux of the membranes was improved, but the rejection of pollution indices did not change noticeably.