Résumé
Water pollution is a critical global concern, posing significant threats to both the environment and human health. To address this, using ceramic membranes for microfiltration in wastewater treatment has garnered attention. This study introduces an efficient method for incorporating corn starch (CS), and SiO2 to enhance the formation of the wollastonite phase and prepare porous clay membranes. XRF, XRD, FTIR, and DTA/TGA analyses, were employed to analyze the raw materials. The study investigates the impact of sintering temperature (850 to 1050 degrees C) as well as the addition of CS and SiO2 (0-10 wt%) on membrane morphology, porosity, mechanical strength, and permeability. Optimal conditions were found at 950 degrees C with 5 wt% CS, 2.5 wt% SiO2, and 92.5 wt% clay, producing a ceramic membrane with 43 % of porosity, a mechanical strength of 32 MPa attributed to SiO2 addition and the formation of wollastonite phase, and an average pore size of 1.45 mu m. This as-synthesized membrane exhibited excellent permeability of 960 L h- 1 m- 2 bar- 1 and effectively clarified textile and tannery effluents, removing over 98 % of turbidity and rejecting 99 % and 95 % of colors, respectively. It also reduced COD by 83 % for textile and 90 % for tannery. Membrane fouling mainly resulted from pore blocking and cake filtration in textile and tannery effluents respectively. Moreover, the ceramic membrane exhibited favorable regeneration performance and alkali resistance, with permeability recovery over 80 % after cleaning. This study provides theoretical and technical support for the development of low-cost ceramic membranes based on clay for advanced wastewater treatment.