Sequential electrochemical oxidation and bio-treatment of the azo dye congo red and textile effluent

Kuppusamy Sathishkumar, Mohamad S. AlSalhi, Edmond Sanganyado, Sandhanasamy Devanesan, Arumugam Arulprakash, Aruliah Rajasekar

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

Textile effluent is often difficult to manage as it contains a high concentration of toxic and recalcitrant synthetic dyes. In this study, congo Red and textile effluent were treated by electrochemical oxidation using RuO2-IrO2 coated titanium electrode as an anode followed by biodecolorization using Pseudomonas stutzeri MN1 and Acinetobacter baumannii MN3. Effluent pre-treatment is often necessary to minimize the inhibitory effects of textile dyes on dye degrading bacterial during bio-treatment. The pre-treatment of Congo Red by electrochemical oxidation for 10 min resulted in a decolorization rate of 98% at a pH, NaCl concentration, and current density of 7, 2 g L−1, and 20 mA cm−2. Subsequent bio-treatment of the pretreated Congo Red enhanced the biodegradation to 93%. The COD removal efficiency in real textile effluent following electrochemical pretreatment and biological treatment using bacterial consortium were 3.8% and 93%, respectively. Therefore, integrating electrochemical oxidation and microbial consortia offers an effective and environmentally friendly approach for treating complex industrial effluents.
Original languageEnglish
Article number111655
Number of pages7
JournalJournal of Photochemistry and Photobiology B: Biology
Volume200
Early online date23 Oct 2019
DOIs
Publication statusPublished - 1 Nov 2019
Externally publishedYes

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