| This study was conducted to remove organics and nutrients from swine wastewater. Two different types of laboratory scale reactors were used to conduct this study. The one was intermittent aeration process and the other was semi-continuous reactor with or without using media. Three different operation modes were utilized in intermittent aeration process such as continuous aeration (aeration on), aeration on/off 1/1 hr, and aeration on/off 1/2 hr. Three different kinds of media were used for the semi-continuous reactor test such as ceramic, ring, and cloth media. The COD, TN, and TP concentration ranges of the diluted swine wastewater were 490 to 520 ㎎/L, 64 to 100 ㎎/L, and 30 to 40 ㎎/L, respectively. According to the experimental results obtained from this experimental studies, COD removal efficiency in intermittent aeration process was about 94% and ammonia removal efficiencies were 70% to 93%. Total nitrogen removal efficiencies were 30% to 47%. Semi-continuous reactor was operated at the same organic loading rate condition with the intermittent aeration process, and one third of supernatant in reactor was withdrawn and filled everyday. COD removal efficiencies were about 93% and ammonia removal efficiencies were 66% to 99%. Total nitrogen removal efficiencies were 22% to 84% depending on the thickness of biofilm. Total phosphorus removal efficiencies were 32%, 81%, 50%, and 69% in without media, ceramic, ring, and cloth media, respectively. The reactor using the ceramic media reactor showed the most high efficiency for the removal of TP. |
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