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Performance evaluation of the polymeric and ceramic membranes in the treatment of textile dye processing wastewater

Textile wastewaters are rated as one of the most polluting among all industrial sectors and their treatment is regulated with strict regulations on the quality of wastewater discharged into the public drainage system. Advanced membrane processes are increasingly used in wastewater treatment, primarily due to separation efficiency and compliance with regulations. Ceramic membranes have higher thermal, chemical and mechanical stability compared to polymeric membranes and since wastewater from textile process has high temperature and it is extremely alkaline, ceramic membranes could be appropriate choice for its treatment. This research represents the assessment of possibilities for textile wastewater treatment collected from the process of dye processing with polymer and ceramic membranes with the pores of same size (MWCO 1 kDa). The aim was to get a high quality permeate ; to remove the color and presence of organic matter and to reduce the amount of wastewater. The experiments were conducted with a laboratory scale cross-flow membrane systems with full recirculation of the retentate equipped with pressure and temperature transducers connected to the PLC unit. The permeate flux recovery after chemical cleaning membrane was evaluated and the efficiency of wastewater treatment was estimated on the basis of the analysis of raw water and permeate. The effect of the cross flow velocity (CFV) on membrane fouling and normalized flux decline was investigated. Energy consumption has also been studied. PES flat membrane has proven to be more effective in the treatment of wastewater from the textile dyeing process with the following achieved separation of TSS, TOC and color: 56%, 72% and 85%. Almost complete regeneration of PES membranes was achieved with chemical cleaning procedure. Unlike the ceramic membrane in the case of PES flat membrane ratio of energy consumption for permeate and retentate stream is less.

ultrafiltration ; wastewater from textile dying processes ; PES membrane ; ceramic membrane

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