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Preparation and characterization of hydrothermally engineered TiO2-fly ash composite membrane

Frontiers of Chemical Science and Engineering 2017年第2期11卷 266-279页

作者： kanchapogu suresh G. Pugazhenthi R. Uppaluri Department of Chemical Engineering Indian Institute of Technology Guwahati Assam 781039 India

This work targets 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, morphological and mechanical properties were evaluated. The separation potential of the composite membrane was evaluated for 100-200 mg·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·L^-1. Compared with the fly ash membrane in the average 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 methodology based ash membrane, the response analysis inferred that the optimum process parameters to achieve maximum membrane flux and rejection are 207 kPa, 200 mg·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 good agreement with the values obtained from experimental investigations （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 mitigate environmental hazards associated with the disposal of oily wastewaters.

关键词： TiO2-fly ash membrane oily wastewater fouling microfiltration

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