BIOCHEMICAL MODEL AND MECHANISM FOR ACINETOBACTER NITRITE INHIBITION

Lee, Chan-Won; Weon, Seung-Yeon

doi:2005.10.1.22

Environmental Engineering Research 2005;10(1): 22-30. DOI: https://doi.org/10.4491/eer.2005.10.1.022

BIOCHEMICAL MODEL AND MECHANISM FOR ACINETOBACTER NITRITE INHIBITION

¹Department of Environmental Engineering, Kyungnam University, Masan, 631-701, Korea
²Department of Environmental Engineering Sciences, University of Florida, Gainesville, FL 32611, USA

Corresponding Author: Chan-Won Lee ,Tel: +82-55-249-2988, Fax: +82-55-249-2994, Email: water@kyungnam.ac.kr

Received: September 8, 2004; Accepted: February 1, 2005.

ABSTRACT

Nitrite accumulation is not unusual in batch processes such as sequencing batch reactor (SBR) with high-strength of ammonium or nitrate wastewaters. A possible mechanism of nitrite inhibition on Acinetobacter was depicted in a biochemical model, which the protonated species, nitrous acid form of nitrite, affects proton relating transport at the proton-pumping site crossing the cell membrane under unlimited carbon and phosphorus conditions. This effect exerts inhibition of phosphorylation under aerobic condition and yields low APT/ADP ratio, consequently decrease poly-P synthesis and phosphorus uptake from outside the cell in the model.

Keywords: Acinetobacter | nitrite inhibition | biochemical model | ATP/ADP ratio