Reduction of adsorbed dyes content in the discharged sludge coming from an industrial textile wastewater treatment plant using aerobic activated sludge process

Journal of Environmental Management
Maroua HaddadHassib Bouallagui

Abstract

Dye mass balance study at full-scale industrial textile wastewater (ITW) treatment plant showed that 1.5 ton of excess waste sludge, containing 304.5 Kg of dyes, are daily produced and discharged in landfills. Therefore, this by-product of activated sludge process (ASP) presents a serious environmental problem. In this work, a laboratory and pilot scale investigations were carried out to optimize aerobic biodegradation efficiency to reduce the amount of residual adsorbed dye that will be found in the waste sludge. The resistance of acclimated biomass to the toxicity of ITW was studied in 2.5 L batch reactors using different dye to biomass (D/B) ratios of 0.102, 0.25 and 0.72 g CODS/g VSS. Results of respirometric analyses showed that acclimated activated sludge (AS) biomass is able to treat ITW at high D/B ratio of 0.72 g CODS/g VSS. Moreover, biodegradation kinetic study using Monod law showed that COD and color removal were better for the highest D/B ratio. The half saturation coefficient of heterotrophs for indigo dye (KSind) of 20.01 g/m3 showed high affinity between biomass and dye molecules. Optimization of the process at pilot-scale with different hydraulic retention time (HRT) of 2-5 days, and different sludge recycling...Continue Reading

Citations

Jun 21, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Jia OuyangChein-Chi Chang
May 14, 2021·World Journal of Microbiology & Biotechnology·Grazielly Maria Didier de VasconcelosCristiano José de Andrade
May 15, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Armin GeroeeyanElaheh Konoz

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