摘要：This work targ.ts the preparation and char-acterization of an inexpensive TiO2-fly ash composite membrane for oily wastewater treatment. The composite membrane was fabricated by depositing.a hydrophilic TiO2 layer on a fly ash membrane via the hydrothermal method, and its structural, morpholog.cal and mechanical properties were evaluated. The separation potential of the composite membrane was evaluated for 100-200 mg.#183;L^-1 synthetic oily wastewater solutions. The results show that the composite membrane has excellent separation performance and can provide permeate stream with oil concentration of only 0.26-5.83 mg.#183;L^-1. Compared with the fly ash membrane in the averag. permeate flux and performance index （49.97 × 10^-4 m^3·m^2·s^-1 and 0.4620%, respectively）, the composite membrane exhibits better performance （51.63× 10^-4 m^3·m^2·s^-1 and 0.4974%）. For the composite surface methodolog. based ash membrane, the response analysis inferred that the optimum process parameters to achieve maximum membrane flux and rejection are 207 kPa, 200 mg.#183;L^-1 and 0.1769 m·s^-1 for applied pressure, feed concentration and cross flow velocity, respectively. Under these conditions, predicted responses are 41.33× 10^-4 m^3·m^2·s^-1 permeate flux and 98.7% rejection, which are in g.od ag.eement with the values obtained from experimental investig.tions （42.84× 10^-4 m^3·m^2·s^-1 and 98.82%）. Therefore, we have demonstrated that the TiO2-fty ash composite membrane as value added product is an efficient way to recycle fly ash and thus mitig.te environmental hazards associated with the disposal of oily wastewaters.