The effect of salinity conditions on kinetics of trichloroethylene biodegradation by toluene-oxidizing cultures

Journal of Hazardous Materials
Chi-Yuan Lee, Wen-Der Liu

Abstract

This study investigates the effect of salt (NaCl) conditions on the biodegradations of trichloroethylene (TCE) by mixed cultures enriched on toluene. Two cultures were separately cultivated in this investigation, involving culture LHTO4, cultivated with freshwater and culture HHTO4, cultivated with 3.5% (w/v) NaCl solution. Batch tests were conducted to elucidate the degradations of toluene, TCE and a mixture of toluene and TCE by cultures LHTO4 at salinities of 0, 2 and 3.5% and by HHTO4 at salinity of 3.5%. The measurements were analyzed with microbial kinetics. The results show that for culture LHTO4 in the resting cells, when the transient salinities increased from 0 to 3.5%, the maximum specific rate of TCE degradation, k(TCE), declined from 2.28 to 1.45 d(-1), and the observed TCE transformation capacity, T(c,obs), decreased from 0.060 to 0.036 mgTCE/mgVSS. In the presence of toluene, TCE degradation was more inhibited by toluene (inhibition coefficients, K(I,TOL) were 0.8, 2.2, and 0.96 mg/L for salinity 0, 2, and 3.5%, respectively) than toluene degradation was by TCE (K(I,TCE) were 14, 5.8, and 1000 mg/L for salinity 0, 2, and 3.5%, respectively). Under long-term salinity stress, the culture HHTO4 maintained its capaci...Continue Reading

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Citations

May 27, 2014·Journal of Hazardous Materials·Seungjin KimWookeun Bae
Oct 3, 2012·Journal of Biotechnology·Yi Zhang, Joo Hwa Tay
Jul 21, 2010·Journal of Hazardous Materials·Chen LinZu-Liang Chen
Jun 2, 2012·Journal of Speech, Language, and Hearing Research : JSLHR·Eon-Suk Ko, Melanie Soderstrom
Dec 19, 2019·Language and Speech·Steven Coats

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