Abstract
The o-cresol is one of the VOCs toxic compounds, it is used as pharmaceutical intermediates, reagents, custom synthesis and as a solvent, disinfectant and chemical intermediate for a wide variety of products including resins, paints and textiles. Efficient treatment technologies are required to reduce o-cresol concentration in wastewater to acceptable levels because o-cresol is hazardous even at low concentration. Biological treatment methods have been researched to treat o-cresol in wastewater. Several studies have shown that o-cresol can aerobically degraded by a wide variety of microorganisms.
In this study, a series of experiments were performed to examine the effects of the mineral medium composition and the pH on o-cresol removal. In this purpose, o-cresol biodegradation was carried out in a batch reactor containing mixed bacteria; the temperature (30 °C), the stirring velocity (200 r/min), the KH2PO4 concentration (1.5 g/L), the K2HPO4 concentration (2 g/L), and o-cresol concentration (100 mg/L) were kept constants. The initial pH was varied in the range 5–9 and the mineral components were tested in the following concentration ranges: 0–2 g/L for nitrogen sources (NH4Cl, KNO3, and NH4NO3), 0–0.5 g/L for NaCl, and 0–0.2 g/L for MgSO4. Their effects on o-cresol biodegradation and specific growth rate were examined. The shorter biodegradation time of o-cresol was 35.6 h for NH4Cl, NaCl, and MgSO4 concentrations of 1 g/L, 0.3 g/L, and 0.1 g/L, respectively. Maximum specific growth rate (0.33 h−1) and total o-cresol removal (99.99 %) were recorded for an optimal pH value of 8.
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Hamitouche, Ae., Bendjama, Z., Amrane, A., Kaouah, F. (2015). Biodegradation of o-Cresol by a Pseudomonas spp. In: Dincer, I., Colpan, C., Kizilkan, O., Ezan, M. (eds) Progress in Clean Energy, Volume 1. Springer, Cham. https://doi.org/10.1007/978-3-319-16709-1_52
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DOI: https://doi.org/10.1007/978-3-319-16709-1_52
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