Kinetics of anaerobic cometabolism of 2,4-dinitrotoluene with ethanol as the primary substrate

Author:

Cheng Jiayang1,Suidan Makram T.2,Venosa Albert D.3

Affiliation:

1. Biological and Agricultural Engineering Department, North Carolina State University, Raleigh, NC 27695-7625, USA

2. Department of Civil and Environmental Engineering, University of Cincinnati, Cincinnati, OH 45221-0071, USA

3. National Risk Management Research Laboratory, US Environmental Protection Agency, 26 W. M. L. King Drive, Cincinnati, OH 45268, USA

Abstract

A kinetic model that describes the anaerobic cometabolism of 2,4-dinitrtoluene (DNT) with ethanol as the primary substrate has been developed based on experimental results. The kinetic parameters were estimated using the Levenberg-Marquardt algorithm. 2,4-DNT is anaerobically biotransformed to 2,4-diaminotoluene (DAT) via 4-amino-2-nitrotoluene (4-A-2-NT) and 2-amino-4-nitrotoluene (2-A-4-NT) by the bacteria whose growth is supported by utilizing ethanol. 2,4-DNT shows inhibition to its own biotransformation. It also exhibits a very strong competitive inhibition to further biotransformation of 4-A-2-NT and 2-A-4-NT. All the aromatics in the system, 2,4-DNT, 4-A-2-NT, 2-A-4-NT, and 2,4-DAT, inhibit the conversion of ethanol. Hydrogen produced from the acetogenesis of ethanol is utilized for the transformation of the nitroaromatics. The utilization of hydrogen and acetate by methanogenic bacteria is very strongly inhibited by the presence of the nitroaromatics. Acetate exhibits strong competitive inhibition to the biodegradation of propionate.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Anaerobic removal of linear alcohol ethoxylates;Bioresource Technology;2002-04

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