Studies on growth kinetics of predominantly Pseudomonas sp. in internal loop airlift bioreactor using phenol and m-cresol

Abstract

Growth profile of predominantly Pseudomonas species was studied using wastewater containing phenol and m-cresol, as single and multi component systems in an internal loop airlift bioreactor (ILALR). The species utilized for the study was isolated from a wastewater treatment plant. The reactor was operated at both lower and higher hydraulic retention time (HRTs), 4.1 h and 8.3 h, respectively. The inlet phenol and concentration was varied between 100 and 800 mg/L with 800 mg/L as shock loading concentration for an HRT of 8.3 h. For 4.1 h HRT, the concentration was varied 100 and 500 mg/L using 500 mg/L as a shock loading concentration. The study showed complete degradation of both phenol and m-cresol, when present individually at an HRT of 8.3 h with an enriched biomass output. The specific growth rate of the culture at various phenol and m-cresol concentrations was fitted to a Monod model. The biokinetics value showed good potential of Pseudomonas species employing the internal loop air lift bioreactor in utilizing high strength phenolics containing wastewater. Culture growth profile with both phenol and m-cresol as mixtures also showed decreased lag times with complete utilization of the phenolics.

Atmospheric-pressure dielectric barrier discharge generation by a full-bridge flying capacitor multilevel inverter

“…This is an apparent manifestation of the importance of the reactive oxygen species in the organic degradation process. m-cresol has been removed by biological [29][30][31][32][33][34][35] and adsorption [36,37] methods. These methods exhibit good elimination efficiency at low concentrations of m-cresol; however, it is known that the generation of some by-products can be toxic to bacteria, which may reduce their effectiveness.…”

Hydrodynamics of Pilot Plant Scale Airlift Reactor in Presence of Alcohols

“…It fi nds major applications in the pharmaceutical industries and wastewater treatment utilities [1][2][3][4] . Specifi cally, airlift reactors are extensively used for mammalian cell cultures, biological processes with solid biocatalysts, to obtain proteins etc.…”

Response of low-strength phenol-acclimated activated sludge to shock loading of high phenol concentrations

“…Batch and continuous processes using either pure or mixed cultures are employed for the treatment of phenolcontaining wastewaters (Buitron and Gonzalez, 1996;Yeom et al, 1997;Gonzalez et al, 2001;Gallego et al, 2003;Moharikar and Purohit, 2003;Chan and Lim, 2007;Kobayashi et al, 2007;Yang and Lee, 2007;Zhao et al, 2009;Saravanan et al, 2011). Mixed cultures have been shown to be more efficient when the emphasis is placed on the complete mineralisation of toxic organic compounds.…”