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Environmental Engineering Research 2008;13(4): 203-209. DOI: https://doi.org/10.4491/eer.2008.13.4.203
Anaerobic/oxic Treatment of Slurry-type Swine Waste
Chul Hee Won, and Jay Myoung Rim
Department of Environmental Engineering, Kangwon National University, Korea
Corresponding Author: Jay Myoung Rim ,Tel: +82-33-250-6352, Fax: +82-33-254-6357, Email: jmrims@kangwon.ac.kr
Received: July 8, 2008;  Accepted: September 7, 2008.
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ABSTRACT
This paper presents the experimental results in five months operation from a combined anaerobic/oxic system treating swine waste with average concentrations in organic matter and nitrogen of 7,930 mgCOD/L and 671 mgTKN/L, respectively. The system was formed using an upflow anaerobic sludge blanket (UASB) reactor and oxic reactor connected in series with a recycling line of oxic effluents to UASB for its denitrification. The UASB reactor was operated at an organic volumetric loading rate (VLR) of 2.1~4.5 kgTCOD/m3/day and the removal efficiency of TCOD was 66.3~85.4%. The overall removal efficiency of TCOD was more than 99%. The oxic reactor was operated at a nitrogen VLR of 0.10~0.20 kgTKN/ m3/day and the nitrification efficiency was 75%. However, the complete denitrification was observed in the UASB reactor that was due to the optimal temperature and sufficient carbon source. The overall removal rate of TN was about 80%. About 76.2% of the influent COD mass was accountable in a COD mass balance at a level of VLR 3.64 kgCOD/m3/day. The production rate of methane was 0.32 LCH4/gCODremoved when influent organics, VLR, were recorded by 3.4~4.5 kgCOD/m3/day.
Keywords: Denitrification | Methane | Nitrification | Swine waste | UASB
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