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Comparison of ceramic and polymeric ultrafiltration membranes for treating wastewater from metalworking industry
Murić, Arnela ; Petrinić, Irena ; Lykkegaard Christtensen, Morten
Oily wastewater is one of the major pollutants that occur in the metal industry and is very harmful to the environment, especially to aquatic life. All conventional methods such as dissolved air ...flotation, coagulation, adsorption, used during oily wastewater treatment have their advantages but none is as effective as membrane technology, which offers many possibilities regarding the applications of different materials, modules and pressures. The aim of this study was a comparison between the ceramic and polymeric membrane modules for model solutions (1%, 2% and 4% solutions of hydraulic fluid Ultra Safe 620 in acidic and alkaline mediums). The model solution was filtered on a laboratory scale by using two plants equipped with ceramic (Al2O3/ZrO2) and polymeric (PVC) membrane modules. The best result was obtained when using ceramic membranes where reversible membrane fouling was mainly presented, whilst in the case of polymeric membranes the irreversible membrane fouling was dominant. The physico-chemical analyses were performed by measuring pH, conductivity, turbidity, particle size and zeta potential, chemical oxygen demand, and lipophilic substances. Regarding substancesʼ removals, the ceramic membranes were more efficient compared to the polymeric ones.
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