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Low-cost ceramic membranes supported by fly-ash-based substrates were fabricated. The membrane pore sizes were abated significantly after coating new layers on the substrates. The effect of substrate pore size on the composite membrane pore size distribution was investigated. The fabricated membranes were tested in transport membrane condenser for water and heat recovery from flue gas. Experimental results indicate that heat flux recovered by the prepared membrane was 9.2%-10.8% lower than that recovered by commercial membrane. The findings from the recovery test provide guidelines for developing low-cost membranes for gas dehydration.