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Abstract
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The main objective of this research is the development of innovative two-layer tubular ceramic
membranes with improved separation properties, high mechanical and thermal stability using
affordable and easily accessible raw materials. In this regard, firstly, the clay-based ceramic
support membrane was fabricated by extrusion technique using kaolin, alumina and natural
zeolite. Besides, changes in thermal properties, shrinkage, porosity and mechanical strength of
the prepared sample were evaluated as a function of treating temperature to obtain the best
membrane support. Subsequently, the cross-flow filtration technique was employed to coat
the natural zeolite and activated carbon over the support membrane to prepare the two-layer
microfiltration membranes of MF-Z and MF-C, respectively. Finally, the performance of ceramic
support, MF-Z and MF-C membranes were assessed during oily wastewater treatment. The
results revealed that MF-Z and MF-C membranes could remove oil from 1,000 to 90 mg/L and
1,000 to 13 mg/L, respectively, while the concentration of oil in the permeate flux of the
ceramic support was around 190 mg/L.
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