Effect of combination dope composition and evaporation time on the separation performance of cellulose acetate membrane for demak brackish water treatment

• Main Authors: Kusworo, Tutuk Djoko, Budiyono, Ikhsan, Diyono, Rokhati, Nur, Prasetyaningrum, Aji, Mutiara, F.R., Sofiana, N.R.
• Format: Conference Proceeding
• Language: English
• Subjects: Brackish water; Cellulose acetate; Coastal areas; Coastal waters; Composition effects; Evaporation; Membranes; Morphology; Phase inversion; Phase shift; Polyethylene glycol; Polymers; Pore size; Porosity; Separation; Water treatment
• ISSN: 2261-236X; 2274-7214; 2261-236X
• DOI: 10.1051/matecconf/201710101004

The coastal areas in Indonesia often have a problem of clean water lack, because the water is classified as brackish water. Therefore, this research investigated the fabrication of CA membranes using phase inversion method for brackish water treatment. Investigation was conducted to study the effect of combination dope composition and evaporation time on separation performance and morphology of the memrbane. Membrane was fabricated by dry-wet phase inversion technique with variation of polymer concentration 17, 18 and 20 wt% in the total solid and evaporation time of 5, 10 and 15 seconds, respectively. The asymmetric membranes were characterized by permeability test through rejection and flux measurements using brackish water as feed. The experimental results from SEM images analysis showed that all the membranes have a thin small porous layer and thicker sub-structure of larger porous layer formed asymmetric membrane. Moreover, the greater polymer concentration is resulting smaller pore size and smaller membrane porosity. The longer evaporation time was also resulted in denser membrane active layer. The best membrane performance was observed at the composition of 20 wt% CA polymer, 1 wt % polyethylene glycol with the solvent evaporation time of 15 seconds.