메셀로스폐액의 주입율에 따른 2단탈질공정의 질소 제거 = Effect of Mecellulose on the Nitrogen Removal of Low Organic Loadings in 2-stage Denitrification Process

다국어 초록 (Multilingual Abstract)

The purpose of this study was to develop a solution to reduce the cost of methanol as external carbon source. The raw water of J-S.T.P. contains low concentration of readily biodegradable organics and high concentration of nitrogen due to the influents of industrial wastewater and leachate. Consequently, the influent C/N ratio is very low, and thus the supplemental addition of methanol is required to provide external carbon source for denitrification. Pilot plant experiments composed 2-stage denitrification process were performed to examine the effects and performances of the selected carbon source and the operation conditions for applications in practice.
When the same amount of denitrifying substrates based on denitrification rate of methanol were injected, the effluent T-N concentration of using mecellulose wastewater was similar to that of methanol. Comparing the influent concentration of carbon source and the denitrification rate, it was shown that the denitrifying potential of mecellulose wastewater was 60% and injecting 1/3 of carbon source into the preanoxic tank was appropriate to ensure the stabilized effluent water quality. The COD,, requirement of mecellulose wastewater per nitrogen removed was 1.4 times of the required amount for methanol, and the settlability of sludge treated with mecellulose wastewater improved about 29%, which confirmed its potential as effective external carbon source.