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

Publication history: Received August 30, 2002
Accepted January 2, 2003

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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Evaluation of Increased Denitrification in an Anoxic Activated Sludge Using Zeolite

Se-Jin Park Chang Gyun Kim^† Tae-Il Yoon Dong Wook Kim¹

Division of Environmental & Geosystem Engineering, Inha University, 253 Yong Hyun Dong, Nam Gu, Incheon 402-751, Korea ¹Department of Environmentals, Cheonan National Technical College, Cheonan 330-717, Korea

cgk@inha.ac.kr

Korean Journal of Chemical Engineering, May 2003, 20(3), 492-495(4), 10.1007/BF02705554

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Abstract

Zeolite added activated sludge unit (ZU) under anoxic conditions improved nitrate removal efficiency by 48% (i.e., equivalent to approximately 10 mg/l) greater than that of a conventional activated sludge unit (CU) regardless of varying C/N ratio ranging from 0 to 4.8. For a C/N ratio of 4, no significant differences of denitrification rate were found between two units showing a range of 6.7 to 6.9 mg NO3(-)-N/g VSS (volatile suspended solids) hr. However, a C/N ratio decrease to 1.6 was ascribed to considerable differences in denitrification rate showing 4.15 mg NO3(-)-N/g VSSㆍhr for the ZU, which was 39% greater than that of the CU presenting at 2.98 mg NO3(-)-N/g VSSㆍhr. It was decided that the presence of greater concentration of MLVSS (mixed liquor suspended solids) in the ZU can be efficiently used for enhanced denitrification as a potential carbon source due to autolysis, although a lower concentration of COD (i.e., less than 1.6 of C/N ratio) is introduced.

Keywords

Acetylene Inhibition Activated Sludge Denitrification Zeolite

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