The lack of seed sludges for Ammonium Oxidizing Bacteria (AOB) and slow-growing ANaerobic AMMonium OXidation (ANAMMOX) bacteria is one of the major problem for large-scale application. In this study, 24m3 of single-stage SBR (Sequencing Batch Reactor) was operated to remove nitrogen from reject water using AOB and ANAMMOX bacteria cultivated from activated sludge in the field. The ANAMMOX activity was found after 44 days of cultivation in the ANAMMOX cultivation reactor, and then 0.66 kg N/m3/d of the nitrogen removal rate was achieved at 0.78 kg N/m3/d of the nitrogen loading rate at 153 days of cultivation. The AOB cultivation reactor showed 0.2 kg N/m3/d of nitrite production rate at 0.4 kg N/m3/d of nitrogen loading rate after 36 days of operation. The cultivated ANAMMOX bacteria and AOB was mixed into the single-stage SBR. The feed distribution was applied to remove total nitrogen stably in the single-stage SBR. The nitrogen removal rate in the single-stage SBR was gradually enhanced with an increase of specific activities of both AOB and ANAMMOX bacteria by showing 0.49 kg N/m3/d of the nitrogen removal rate at 0.56 kg N/m3/d of the nitrogen loading rate at 54 days of operation.

본 발표는 45,460 m³/d (10 Million Imperial Gallons per Day (MIGD)) 규모를 가진 한국 최초 및 최대 대규모인 부산 기장 해수담수화 플랜트에 대한 소개이다. 본 플랜트는 2010년부터 건설 되어 2015년 말에는 상업 운전이 시작될 예정이다. 플랜트의 특징으로는 국산화된 다양한 전처 리 기술 (DABF, MF, DMF)의 적용, 대용량 16인치 RO 막 적용, 에너지 소모량을 줄이기 위한 대 용량 8 MIGD RO train의 one module화 이다. 16인치 RO 막은 평균 48%의 high recovery rate 과 14.7 LMH high flux의 성능을 보였으며, 최종 power consumption은 약 3.98 kWh/m³을 기록 하였다.