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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received September 3, 2007
Accepted October 4, 2007

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Bio-denitrification of the nitrate waste solution from the lagoon sludge in a continuous bio-reduction process

O Mi Lee Jong Hyeok Oh¹ Marie Libert² Doo Seong Hwang Yun Dong Choi Jin Ho Park Un Soo Chung Byung Real Jo³ Min Ju Kim⁴ Sang- Joon Lee^4†

Korea Atomic Energy Research Institute, Daejeon 305-600, Korea ¹Korea Research Institute of Chemical Technology, Daejeon 306-600, Korea ²French Atomic Energy Commission, Center de Cadarache, Saint-Paul-Lez-Durance CEDEX, 13108, France ³Department of Environmental Engineering, Chungju National University, Chungbuk 308-702, Korea ⁴Department of Microbiology, College of Natural Sciences, Pusan National University, Busan 609-735, Korea

sangjoon@pusan.ac.kr

Korean Journal of Chemical Engineering, July 2008, 25(4), 787-792(6), 10.1007/s11814-008-0129-8

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Abstract

The treatment of lagoon sludge is a serious task during the decommissioning of a uranium conversion plant. The main component of the sludge is ammonium nitrate, which is a very explosive material. Therefore, biological removal of the ammonium nitrate would be an attractive process. In this work, the bio-denitrification of the nitrate solution from lagoon sludge with a continuous fermentation process was studied. The optimal conditions for removal of nitrate by Pseudomonas halodenitrificans in the continuous bio-reduction process were a C/N ratio and pH of 3.1 and 7.5, respectively, with CO2 gas control, and five times the microelements as used in a batch culture, at 30 oC. It was concluded that bio-denitrification could be applicable to lagoon sludge waste, but with some limitations.

Keywords

Nitrate Denitrification Pseudomonas halodenitrificans Continuous Culture

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