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Appl Environ Microbiol. 1986 December; 52(6): 1231-1235
Copyright © 1986, American Society for Microbiology. All Rights Reserved.

Inhibitor Evaluation with Immobilized Nitrobacter agilis Cells

Yu-Li Tsai, Steven M. Schlasner and Olli H. Tuovinen^*

¹ Departments of Microbiology and Chemical Engineering, ² Ohio State University, Columbus, Ohio 43210

ABSTRACT

Nitrobacter agilis was entrapped in calcium alginate beads and used as a floating bed supplied with a continuous flow of nitrite medium. Complete nitrite oxidation was achieved within 30 h, and the system could be maintained for at least 210 h. The immobilized Nitrobacter system was subjected to sulfur oxyanions, acidity, and metal ions. Thiosulfate and tetrathionate (up to 20 mM each) did not inhibit the nitrite oxidation activity. A low pH of 4.2 resulted in the complete cessation of nitrite oxidation, and the activity was not restored upon increasing the pH to 7. Nitrite oxidation by N. agilis was sensitive to 10 mM each Ni²⁺ and Al³⁺ but insensitive to 10 mM MoO₄^2–.

^* Corresponding author.

Present address: Department of Molecular and Cell Biology, University of Connecticut, Storrs, CT 06268.

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