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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 25, 2001
Accepted February 14, 2002

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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Release Characteristics of Nitrogen and Phosphorus in Aerobic and Intermittent Aerobic Sludge Digestion

Seong Hong Kim Woon Joong Kim^† Tai Hak Chung¹

Dept. of Civil Engineering, College of Engineering, Chosun University, 375 Seosuk-Dong, Dong-Gu, Gwangju 501-759, Korea ¹Dept. of Civil, Urban & Geosystem Engineering, College of Engineering, Seoul National University, 56 Shinlim-Dong, Kwanak-Gu, Seoul 151-742, Korea

gochamp@chosun.ac.kr

Korean Journal of Chemical Engineering, May 2002, 19(3), 439-444(6), 10.1007/BF02697154

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Abstract

Batch digestion experiments of biological sludge by continuous aeration and intermittent aeration were performed to find the release characteristics of nitrogen and phosphorus in this study. Nitrogen content of the sludge increases for the endogenous respiration period, but the content gradually decreases to the same content of raw sludge. Nitrogen removal efficiency was up to 42.7% for 34 days by the intermittent aerobic digestion of which aeration ratio was 0.25 and the removal efficiency was dependent on aeration ratio. Phosphorus does not release until the phosphorus content reaches a limit content. So, phosphorus content of sludge increases gradually to this limit. After the phosphorus content of the sludge reaches this limit, phosphorus will be released proportional to VSS reduction rate.

Keywords

Sludge Aerobic Digestion Intermittent Aerobic Digestion Nitrogen Phosphorus

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