Journal of Microbial & Biochemical Technology

Performances of a novel microbial consortium for biological treatment of industrial textile wastewater in a membrane bioreactor: Optimization through response surface methodology

International Conference and Summit on Industrial & Pharmaceutical Microbiology

October 17-18, 2016 Kuala Lumpur, Malaysia

Imen Khouni and Ahmed Ghrabi

Water Research and Technologies Centre, Tunisia

Posters & Accepted Abstracts: J Microb Biochem Technol

Abstract:

The textile dye industry is far from being ecologically correct and sustainable. Textile wastewater is a complex and highly variable mixture of many polluting substances including dyes, which pose a threat to the environmental safety. Therefore, textile effluents must be treated before their release into the environment. This study investigated the potential of biological treatment to decolorize textile wastewater using a novel microbial consortium (IKH22) under a membrane bioreactor (MBR) laboratory-scale unit. First, the bioreactor was conducted at a low biomass concentration (4 gMLVSS.L-1). Decolorization performances were maintained at very high rates (90-100%) for dye mass loading rates in the range of 1.25-5 mg.g-1.d-1. When the dye concentration was increased to 7.5 mg.g-1.d-1, the decolorization performances of the MBR have been affected (81- 87%). To remedy to this decrease of reactor decolorization performances, first, the biomass concentration has increased to 8 gMLVSS.L-1. Thus, a total MBR decolorization was observed (100%). On the other hand, for organic matter concentrations (COD soluble) under 1300 mg.L-1, all the microorganisms and microfiltration membrane allows the elimination of most soluble COD of the treated effluent. Second, at a low biomass concentration (4 gMLVSS.L-1), the effect of different operating conditions on decolorization and degradation efficiency such as initial dye concentration, pH, aeration (by agitation rate) and ratio of organic carbon/nitrogen has been studied adopting a full range of response surface methodology (RSM) using central composite design (CCD) model �??Box-Behnken�?�. The optimization study shows that the maximum of decolorization (93%) and COD removal rates (95%) were obtained at: C/N of 22.57 g/g; pH of 7.94; agitation rate of 160.32 rpm/min and dye loading rate of about 19.48 mg/g.

Biography :

Email: imen.khouni@yahoo.fr