MBR과 황탈질 공정에서 응집제 주입에 따른 질소·인 제거에 관한 연구

• Published in: Daehan hwan'gyeong gonghag hoeji Vol. 32; no. 10; pp. 949 - 956
• Main Authors: 이영호(Young Ho Lee), 유성종(Soung Jong Yoo), 오대민(Dae Min Oh), 이영신(Young Sin Lee)
• Format: Journal Article
• Language: Korean
• Published: 대한환경공학회 01.10.2010
• Subjects: 환경공학; 탈질율; Coagulant; Denitrification Rate; SDR; 황 탈질반응조; 알칼리도; Sulfur Denitrification Reactor; 응집제; Alkalinity; MBR; 분리막생물반응조; Membrane Bioreactor
• ISSN: 1225-5025; 2383-7810

하수의 질소･인 동시 제거를 위해 MBR 공정과 SDR 공정순으로 구성하여 처리용량 10 m3/일의 pilot plant를 약 350일 동안 운전을 하였다. MBR 유출수에 알칼리도(NaHCO3)와 응집제(Alum)를 일정한 농도로 주입하여 황 탈질 공정에서 질소･인을 동시에 제거하기 위해 인 제거와 탈질효율에 대한 영향을 조사하였다. MBR 유출수에 응집제를 주입 여부에 따라 SDR 공정에서의 T-N 제거율은 92.1%와 87.8%로 각각 나타났으며, 탈질율은 93.8%와 87.1%로 각각 나타났다. T-P 제거율은 응집제를 주입하지 않고 실험한 결과 약 26.7%로 나타났지만, Alum 2.6~4 mg/L (as Al)를 연속적으로 주입하여 실험한 결과에서 75.6%의 T-P 제거율이 나타났다. 따라서 응집제를 주입함에 따라 SDR 공정에서 탈질효율은 약 6.7% 정도 감소하였으며, 인 제거율은 증가되는 것으로 나타났다. A method for simultaneous removal of nitrogen and phosphate from sewage by elemental sulfur denitrification with membrane bioreactor was proposed, and capacity 10 m3/day of pilot plant was operated for 350 days. This study was investigated to have the effect of denitrification rate and T-P removal with the addition of Alum in Sulfur denitrification Reactor (SDR). The addition of Alum and alkalinity (NaHCO3) in the effluent of MBR was tried to remove simultaneous phosphate and nitrogen in SDR. Characteristics of total nitrogen (T-N) and total phosphate (T-P) removal was compared without and with the addition of Alum as a coagulant. T-N removal without and with the addition of Alum was 92.1% and 87.8%, respectively. And denitrification efficiency was 93.8% and 87.1%, respectively. T-P removal rate was increased to 75.6% in SDR by addition of Alum (2.6~4 mg/L as Al), but T-P removal rate was about 26.7% without the addition of Alum. Therefore, denitrification rate was 6.7% of reduction but T-P removal rate was increased by addition of Alum. KCI Citation Count: 3