Degradation of phenol and phenolic compounds by a defined denitrifying bacterial culture |
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Authors: | Thomas Swapna Sarfaraz Sami Mishra LC Iyengar Leela |
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Institution: | (1) Biotechnology Laboratory, Department of Chemistry, Indian Institute of Technology, Kanpur, 208016, India;(2) Department of Life Sciences, C.S.J.M University, Kanpur, 208016, India |
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Abstract: | Phenol, a major pollutant in several industrial waste waters is often used as a model compound for studies on biodegradation. This study investigated the anoxic degradation of phenol and other phenolic compounds by a defined mixed culture of Alcaligenes faecalis and Enterobacter species. The culture was capable of degrading high concentrations of phenol (up to 600 mg/l) under anoxic conditions in a simple minimal mineral medium at an initial cell mass of 8 mg/l. However, the lag phase in growth and phenol removal increased with increase in phenol concentration. Dissolved CO2 was an absolute requirement for phenol degradation. In addition to nitrate, nitrite and oxygen could be used as electron acceptors. The kinetic constants, maximum specific growth rate max; inhibition constant, K
i and saturation constant, K
s were determined to be 0.206 h–1, 113 and 15 mg phenol/l respectively. p-Hydroxybenzoic acid was identified as an intermediate during phenol degradation. Apart from phenol, the culture utilized few other monocyclic aromatic compounds as growth substrates. The defined culture has remained stable with consistent phenol-degrading ability for more than 3 years and thus shows promise for its application in anoxic treatment of industrial waste waters containing phenolic compounds. |
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Keywords: | Alcaligenes faecalis biodegradation denitrification Enterobacter species phenol |
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