Abstract
This work gives an assessment of the application of two ultrafiltration membrane types, which are the same in pore size but different in chemistry and configuration module, for textile wastewater treatment. Characterization was based on the solute rejection data of two commercial membranes, flat sheet polyethersulfone (PES) and tubular multichannel<br /> ceramic membrane, and flux decline was provided using polyethylene glycol (PEG) solutions of different molar mass. The permeate flux recovery after chemical cleaning was evaluated, and the efficiency of wastewater treatment was estimated on the basis of the analysis of textile wastewater and permeate. The permeate flux decline study showed that fouling was less likely to occur when PES membrane was used for wastewater treatment. PES flat membrane has proven to be more effective in the treatment of wastewater with total organic carbon (TOC) and colour removal efficiency of 72 % and 85 % respectively.
Highlights
Wastewater can contain many contaminants, such as heavy metals,[1] surfactants,[2] pharmaceutical products,[3] dyes,[4] and inorganic salts.[5]
This paper provides a comparative study of the characterization of tubular ceramic and flat sheet polymer membranes of the same pore size intended for the treatment of cotton thread dyeing wastewater
Solutions were used according to the molecular weight cut-off (MWCO) declared by manufacturer for ceramic membrane and with respect to the stated pore size for 1000 g mol–1 (1kDa) reported by Kaya et al.[46] and Carvalho et al.[43] for PES membrane
Summary
Wastewater can contain many contaminants, such as heavy metals,[1] surfactants,[2] pharmaceutical products,[3] dyes,[4] and inorganic salts.[5] There is no doubt that membrane-based treatment technologies are set to dominate due to their improved separation efficiency and lower energy cost.[6,7,8] With regard to their application in the textile industry in the processing of highly loaded wastewater, these technologies have additional importance for environmental protection.[9] Dyes are one of the principal constituents of textile-industry wastewater[10] and are major polluters of water receivers.[10,11,12] During the dyeing process, many auxiliary chemicals like acids, alkalis, salts, surfactants, and oxidation reagents are added to improve dye adsorption and stability of fibres,[10] causing the generation of huge amounts of wastewater containing dyes, complex chemicals, inorganic salts, having high pH value and high temperature, turbidity, and salinity.[12] Textile wastewaters are often discharged after partial treatment or without prior treatment, causing increased amounts of hazardous chemicals
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