title: Mineralization of reactive azo dyes present in simulated textile waste water using down flow microaerophilic fixed film bioreactor.
abstract: The present research emphasizes on degradation of azo dyes from simulated textile wastewater using down flow microaerophilic fixed film reactor. Degradation of simulated textile wastewater (COD 7200mg/L and dye concentration 300mg/L) was studied in a microaerophilic fixed film reactor using pumice stone as a support material under varying hydraulic retention time (HRT) and organic loading rate (OLR). The intense metabolic activity of the inoculated bacterial consortium in the reactor led to 97.5% COD reduction and 99.5% decolorization of simulated wastewater operated under OLR of 7.2kgCODm(3)/d and 24h of HRT. FTIR, (1)H NMR and GC-MS studies revealed the formation of lower molecular weight aliphatic compounds under 24h of HRT, leading to complete mineralization of simulated wastewater. The detection of oxido-reductive enzyme activities suggested the enzymatic reduction of azo bonds prior to mineralization. Toxicity studies indicated that microbial treatment favors detoxification of simulated wastewater.
authors.affiliation: Post Graduate Department of Microbiology, Biogas Research and Extension Centre, Gujarat Vidyapith, Sadra 382 320, Gujarat, India. Electronic address: kshama003@gmail.com.
authors.forename: Kshama
authors.initials: K
authors.lastname: Balapure
authors.affiliation: Post Graduate Department of Microbiology, Biogas Research and Extension Centre, Gujarat Vidyapith, Sadra 382 320, Gujarat, India.
authors.forename: Nikhil
authors.initials: N
authors.lastname: Bhatt
authors.affiliation: Environmental Genomics and Proteomics Lab, BRD School of Biosciences, Sardar Patel University, Satellite Campus, Vadtal Road, Post Box No. 39, Vallabh Vidyanagar 388 120, Gujarat, India. Electronic address: datta_madamwar@yahoo.com.
authors.forename: Datta
authors.initials: D
authors.lastname: Madamwar
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D019149:Bioreactors / Q000382:microbiology*; D004396:Coloring Agents / Q000378:metabolism; D013784:Textiles; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D062065:Wastewater
keywords: Decolorization; Microaerophilic fixed film reactor; Mineralization; Organic loading rate; Simulated textile wastewater