막 결합형 연속회분식 반응조에서 발효음식폐기물을 이용한 영양염류 제거

Abstract

It has been reported that the ratio of carbon to nitrogen sources (C/N ratio) in biological treatment processes is important for water purification. In general, the removal efficiency of biological nutrients decreased because of the low carbon contents. To increase the efficiency, therefore, it is necessary to compensate carbon source. In this research, the effect of fermented food waste as an external carbon source was investigated. The effect of fermented food waste addition into wastewater with low C/N ratio on the removal efficiencies of nitrogen and phosphorous was investigated in membrane coupled sequencing batch reactor. The operation pressure lower than critical permeable flux was maintained to minimize the membrane contamination which was defect of membrane coupled sequencing batch reactor. For 6~12 h/cycle of operation cycle, the contamination of membrane was decreased when the operation period was extended. The removal efficiencies of NH4+-N and PO43--P were increased by 81%～98% and 37%～80% after adding the fermented food waste. Although the activity of nitrogen oxidizing microorganisms decreased when the reaction temperature was decreased to 10℃, the phosphorous removal efficiency was independent of temperature and was increased with the addition of fermented food waste. Therefore, the efficient nutrients removal process can be established when fermented food waste and wastewater with low C/N ratio were simultaneously fed into the membrane coupled sequencing batch reactor.