Influence of Additives on Polysulfone-Based Ultrafiltration Membrane Performance during Peat Water Filtration

Putu Teta Prihartini Aryanti, Khoiruddin, I Gede Wenten



The effect of additives on polysulfone membrane performance in peat water filtration was investigated. Polysulfone membrane was prepared by immersion precipitation from quarternary membrane systems containing N,N-dimethylacetamide (DMAc) as solvent, polyethylene glycol (PEG) and acetone as additives. The performance of membrane was evaluated by pure water flux and humic acid rejection. Results show that rejection of humic acid in peat water increased with the increase of acetone concentration. The maximum rejection was achieved at 8% wt acetone concentration. The presence of acetone contributed to the tight skin layer formation of polysulfone membrane. Other results suggest that membrane hydrophilicity can be improved by increasing of PEG concentration in membrane matrix, which was indicated by the increase of water flux around 127 LMH at the presence 25% wt of PEG. In high PEG concentration, the humic acid rejection was decreased which may be attributed to more open pore formed in the skin layer of the membrane and leads to a more severe irreversible fouling.

Keywords: polysulphone membrane; hydrophilicity; fouling; humic substances