Abstract
Phenol and its derivatives are highly hazardous chemicals profoundly dangerous even at low levels. Hence the management of phenol polluted wastewater represents major environmental challenges. This study investigates the growth and the phenol utilization behavior of microalga DEE 01 isolated from coal gasification effluent treatment plant and identified as Chlorella pyrenoidosa based on 18SrRNA sequence analysis (KX686118). The average % reduction of phenol concentration of the four samples (0.2, 0.4, 0.6 and 0.8 g/L) by C. pyrenoidosa is 97.4% under local ambient conditions at pH-8. It could also degrade phenol in the coal gasification effluent. Haldane inhibitory growth kinetics was used to fit the experimental data and the kinetic parameters obtained were: μmax = 0.7123 day−1, Ks = 0.1899 gL−1; Ki = 0.6898 gL−1 with R2 = 0.9916. In addition to the phenol reduction C. pyrenoidosa was found to reduce the metal ions present in the effluent. The kinetic study of C. pyrenoidosa is observed to possess maximum specific growth and degradation rate, tolerance to toxicity (Ki) and high phenol affinity (Ks).
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