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Environmental Engineering Research 2019;24(2): 309-317. DOI: https://doi.org/10.4491/eer.2018.196
Kinetics of nitrification and acrylamide biodegradation by Enterobacter aerogenes and mixed culture bacteria in sequencing batch reactor wastewater treatment systems
Romsan Madmanang1, Siriprapha Jangkorn2, Jittima Charoenpanich3, and Tongchai Sriwiriyarat4 
1Environmental Science Program, Faculty of Science, Burapha University, Chonburi 20131, Thailand
2Division of Natural Resources and Environment, Faculty of Science and Social Sciences, Burapha University, Sakaeo 27160, Thailand
3Department of Biochemistry, Faculty of Science, Burapha University, Chonburi 20131, Thailand
4Department of Chemical Engineering, Faculty of Engineering, Burapha University, Chonburi 20131, Thailand
Corresponding Author: Tongchai Sriwiriyarat ,Tel: +66-3810-3352, Email: sriwiri@buu.ac.th
Received: May 30, 2018;  Accepted: August 7, 2018.
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This study evaluated the kinetics of acrylamide (AM) biodegradation by mixed culture bacteria and Enterobacter aerogenes (E. aerogenes) in sequencing batch reactor (SBR) systems with AQUASIM and linear regression. The zero-order, first-order, and Monod kinetic models were used to evaluate the kinetic parameters of both autotrophic and heterotrophic nitrifications and both AM and chemical oxygen demand (COD) removals at different AM concentrations of 100, 200, 300, and 400 mg AM/L. The results revealed that both autotrophic and heterotrophic nitrifications and both AM and COD removals followed the Monod kinetics. High AM loadings resulted in the transformation of Monod kinetics to the first-order reaction for AM and COD removals as the results of the compositions of mixed substrates and the inhibition of the free ammonia nitrogen (FAN). The kinetic parameters indicated that E. aerogenes degraded AM and COD at higher rates than mixed culture bacteria. The FAN from the AM biodegradation increased both heterotrophic and autotrophic nitrification rates at the AM concentrations of 100-300 mg AM/L. At higher AM concentrations, the FAN accumulated in the SBR system inhibited the autotrophic nitrification of mixed culture bacteria. The accumulation of intracellular polyphosphate caused the heterotrophic nitrification of E. aerogenes to follow the first-order approximation.
Keywords: Acrylamide biodegradation | Ammonia inhibition | Biodegradation kinetics | Enterobacter aerogenes
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