EFFECT OF AERATION RATES ON SIMULTANEOUS NITRIFICATION AND DENITRIFICATION IN INTERMITTENT AERATED BIOREACTORS.T.T. LE, W. KHANITCHAIDECHA AND A. NAKARUK
Eutrophication caused by high nitrogen wastewater has become a serious problem in many countries. One of the current common applied technologies for nitrogen removal is biological process. In this work, an intermittent aerated bioreactor was developed to treat high nitrogen wastewater. The effect of different aeration rates on the reactor performance was also investigated. The results showed that at the low aeration of 0.5 L/min, the nitrogen removal efficiency reached the peak of 65%, while the nitrification and dentrification rates were approximately 0.2 and 1.8 mg/L-min, respectively. Despite of the higher nitrification rates at higher aeration rates, the denitrification rates were found to decrease because of competitive microorganisms growth and the lack of carbon source. This resulted in the drop of the overall nitrogen efficiency with the increasing aeration rates.
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