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.
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