혐기 소화조 유출수의 아질산화 반응에 온도가 미치는 영향

Preparing for the Standards for Effluents which will be strengthen from 2012, many ways like remodellings and repairs of sewage treatment plant (STP) are considered. The treatment of the recycle water from the sludge treatment process contains high-strength organic compounds and nitrogen is considered as alternative. In the treatment of high-strength nitrogen, nitritation has more economic advantages than nitrification. In this study, lab-scale reactor was operated at the 35°C, 20°C and 10°C conditions using effluent of anaerobic digester to investigate the nitrogen removal by nitritation. Long-term stable nitritation was achieved at the 35°C, 20°C but 10°C. In the stable nitritation states, nitrite conversion was higher at the high temperature of 35°C than the room temperature of 20°C. Also shorter solid retention time (SRT) was needed to induce high nitrite conversion at the high temperature of 35°C. It was showed that temperature and SRT are important factors to induce nitritation.