Biological removal of the xenobiotic trichloroethylene (TCE) through cometabolism in nitrifying systems
2010
Kocamemi, B Alpaslan | Çeçen, F.
In the present study, cometabolic TCE degradation was evaluated using NH₄-N as the growth-substrate. At initial TCE concentrations up to 845μg/L, TCE degradation followed first-order kinetics. The increase in ammonium utilization rate favored the degradation of TCE. This ensured that biological transformation of TCE in nitrifying systems is accomplished through a cometabolic pathway by the catalysis of non-specific ammonia oxygenase enzyme of nitrifiers. The transformation yield (Ty ) of TCE, the amount of TCE degraded per unit mass of NH₄-N, strongly depended on the initial NH₄-N and TCE concentrations. In order to allow a rough estimation of TCE removal and nitrification at different influent TCE and NH₄-N concentrations, a linear relationship was developed between 1/Ty and the initial NH₄-N/TCE ratio. The estimated Ty values lead to the conclusion that nitrifying systems are promising candidates for biological removal of TCE through cometabolism.
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