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Treatment of wastewater containing high concentrations of terephthalic acid by C omamonas sp. and R hodococcus sp.: kinetic and stoichiometric characterization
Author(s) -
OrdazCortés Alberto,
Thalasso Frederic,
SalgadoManjarrez Edgar,
GaribayOrijel Claudio
Publication year - 2014
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12048
Subject(s) - terephthalic acid , degradation (telecommunications) , chemistry , substrate (aquarium) , nuclear chemistry , kinetics , yield (engineering) , stoichiometry , reaction rate constant , wastewater , chromatography , organic chemistry , materials science , environmental engineering , biology , telecommunications , ecology , physics , quantum mechanics , computer science , polyester , engineering , metallurgy
In this work, terephthalic acid degradation was studied with two strains that were isolated and identified as closely related to C omamonas (99%) and R hodococcus (99%) genus. A characterization of both strains was carried out during batch experiments performed at two oxygen transfer capacities (0.094 ± 0.011 and 0.538 ± 0.042 g O 2 / L /h) and five concentrations of terephthalic acid (2.5 to 15.0 g/ L ). Maximum degradation rates of 0.073 ± 0.004 and 0.062 ± 0.003 g TOC / L /h, were observed, for C omamonas sp. and R hodococcus sp., respectively. However, a degradation rate of 0.159 ± 0.011 g TOC / L /h was reached with a mixed culture. H aldane, A iba, E dwards and A ndrews models were used to fit terephthalic acid degradation kinetics, being H aldane the model that best fitted the results. Several parameters were determined including, maximum growth rate, growth yield, substrate affinity and inhibition constant.