Decolorization and detoxification of real textile dyes wastewater using free and immobilized indigenous bacterial consortium in semi-pilot scale

El-Liethy, Mohamed Azab; Hemdan, Bahaa; Hellal, Mohammed Saad; Kamal, Kholod Hamdy; Abou Hammad, Ali Belal; Aboutaleb, Enas; El Nahrawy, Amany M.; El-Taweel, Gamila E.

doi:10.21608/ejchem.2023.215695.8094

Decolorization and detoxification of real textile dyes wastewater using free and immobilized indigenous bacterial consortium in semi-pilot scale

Document Type : Original Article

Authors

¹ Water Pollution Research Department, National Research Centre, Dokki, 12622, Giza, Egypt

² Solid State Physics Department, Physics Research Institute, National Research Centre, Dokki, 12622, Giza, Egypt

10.21608/ejchem.2023.215695.8094

Abstract

Most of the liquid and solid effluents from textile industries are treated by physical and chemical methods such as flocculation, adsorption, filtration and oxidation. Most of the physical methods, however, simply accumulate and concentrate dyes and create solid wastes, and this problem of disposal still exists. Therefore, the main aim of this study was to evaluate the recently developed semi-pilot system using combined biological and nanocomposites treatment for decolorizing and degrading dyes from real textile effluent. Moreover, biodegradation of synthetic and real wastewater using bacteria have been used on bench scale to optimizing the biodegradation conditions. After optimizing the condition, semi-pilot plant was operated by three mixed biocarriers, free and immobilized mixed consortium, and bio-sorption using composite nanoparticles. The obtained results showed that, a good biodegradation and decolorization process where, following all phases and semi-pilot system effluents, all measured parameters significantly decreased. Moreover, the removal percent of chemical oxygen demand (COD), biological oxygen demand (BOD) and color of the effluent of real textile wastewater in semi-pilot system under anaerobic condition reached to 67, 78.71 and 87.80%, respectively. While, the removal percent of COD, BOD and color reached to 72.35, 67.71 and 90.81% under aerobic condition, respectively. The toxicity results indicated that the treated effluent of real wastewater in the semi-pilot system was nontoxic (EC50≥100) under both aerobic and anaerobic condition.

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