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KMID : 0545120040140030639
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Journal of Microbiology and Biotechnology
2004 Volume.14 No. 3 p.639 ~ p.642
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The pH as a Control Parameter for Oxidation-Reduction Potential on the Denitrification by Ochrobactrum anthropi SY509
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Kim SH
Song SH/Yoo YJ
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Abstract
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The pH as a control parameter for oxidationreduction potential (ORP) was investigated through the denitrification by Ochrobactrum anthropi SY509 under non-growing condition. The optimal pH of nitrate reductase was 7.0 and the minimal ORP level was -250 mV for the denitrification under aerobic condition. In the case of anaerobic condition the optimal pHs of nitrate and nitrite reductase were shifted to 10.0 and 9.0 respectively and the minimal ORP levels of nitrate and nitrite reductase were decreased to - 370 mV and -340 mV respectively. In the case of alkaline pH and anaerobic condition the denitrification efficiency of nitrate was increased up to about 2-fold over that of neutral pH and anaerobic condition. Therefore the combined control of pH and ORP in the anaerobic condition is shown to be an important parameter in the biological denitrification process.
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KEYWORD
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