Biomineralization of azo dye bearing wastewater in periodic discontinuous batch reactor: Effect of microaerophilic conditions on treatment efficiency

Bioresource Technology
A Naresh KumarS Venkata Mohan

Abstract

The present study illustrates the influence of microaerophilic condition on periodic discontinuous batch reactor (PDBR) operation in treating azo dye containing wastewater. The process performance was evaluated with the function of various dye load operations (50-750 mg/l) by keeping the organic load (1.6 kg COD/m(3)-day) constant. Initially, lower dye operation (50mg dye/l) resulted in higher dye [45 mg dye/l (90%)] and COD [SDR: 1.29 kg COD/m(3)-day (92%)] removal efficiencies. Higher dye load operation (750 mg dye/l) also showed non-inhibitory performance with respect to dye [600 mg dye/l (80%)] and COD [1.25 kg COD/m(3)-day (80%)] removal efficiencies. Increment in dye load showed increment in azo reductase and dehydrogenase activities (39.6 U; 4.96 μg/ml; 750 mg/l). UV-Vis spectroscopy (200-800 nm), FTIR and (1)H NMR studies revealed the disappearance of azo bond (-NN-). First derivative cyclic voltammogram supported the involvement of various membrane bound redox shuttlers, viz., cytochrome-C, cytochrome-bc1 and flavoproteins (FAD (H)).

References

Mar 10, 2000·Applied Microbiology and Biotechnology·C O'NeillS Wilcox
May 13, 2004·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Mustafa Işik, Delia Teresa Sponza
Jul 16, 2005·Journal of Hazardous Materials·N Chandrasekhara RaoP N Sarma
Jan 23, 2009·Journal of Hazardous Materials·R G SarataleS P Govindwar

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Citations

Aug 11, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Suvanka DuttaRajnarayan Saha
May 10, 2020·Scientific Reports·Omar S BayomieMayyada M H El-Sayed
Apr 10, 2021·Journal of Hazardous Materials·Kejing ZhangYingwen Xue
Aug 8, 2021·Journal of Hazardous Materials·Kejing ZhangYingwen Xue

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