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The synthesis of composite membrane from chitosan, cellulose diacetate and TiO 2 as well as its application for waste detergent treatment were described here. Chitosan was synthesized from small crab shell using a chemical process involving deproteination, demineralization, depigmentation and deacetylation steps. Cellulose diacetate was synthesized from banana kepok using pulping, bleaching and acetylating steps. The production of composite membrane using inversion phase method by varying the concentration of cellulose diacetate 2%, 4%, 6%, 8% and 10%. The optimum mechanical properties of composite membranes were carried out with concentration variation of TiO 2 0.1%  0.15%, 0.20%, 0.25% and 0.30%. The produced composite membranes of chitosan - cellulose diacetate - TiO 2 were characterized by its thickness, performance, mechanical, morphology and were applied to waste detergent treatment. The results showed that the increasing of the concentration of cellulose diacetate made the composite membrane were more porous so the flux increases and the greater concentration of TiO 2 , the greater mechanical properties of the  composite membranes. The optimum composite membrane was obtained with the concentration of chitosan 3%, cellulose diacetate  4% and TiO 2 0.3%, thickness of 0.01 mm, flux of 1099.95 L/m 2 .day, rejection of 97.70%, stress at 0.0225 kN/mm 2 , strain at 0.3906, Modulus Young of 0.0576 kN/mm 2 and can be applied to waste detergent treatment process with flux 832.93 L/m 2 .day and rejection of 95.39%.  GRAPHICAL ABSTRACT

Application of composite membrane from chitosan-cellulose diacetate-TiO2 for waste detergent treatment