earticle

영어

This study was intended to reduce the generation of waste activated sludge (WAS) by injecting a microbial agent into membrane bio reactor (MBR) system. A pilot equipment with a daily treatment capacity of 3,000 L, equipped with a anoxic tank, a MBR, and a permeate storage tank, was manufactured, and a blank operation and an operation with the microbial agent injected were conducted successively after a stabilization operation for approximately 81 days. According to the quality of the treated water in the operations above, T-N removal rates were almost the same, but CODMn removal rate in the operation with the microbial agent injected was approximately 32% higher than that in the blank operation. In addition, it was demonstrated that the changes in the total MLSS amount were 8,154 g in the blank operation and 6,496 g in the operation with the microbial agent. Hence, it was possible to confirm that the sludge was reduced by approximately 20% when injecting the microbial agent. This study concludes that the characteristics of the microbial agent can be sufficiently exhibited and the higher effect of the reduction in sludge generation amount can be obtained if the limitations of the composition that the equipment for the pilot experiment has are improved and if it is possible to operate for an extended period of time.

한국어

본 연구에서는 MBR 공법에 미생물제재를 주입하여, 발생하는 잉여슬러지를 저감하고자 하였다. 일일 처리용량 3,000 L 규모의 Pilot 장치를 무산소조-MBR반응조-처리수조로 구성하여 제작하였으며, 약 20일간의 안정화를 위한 운전 후 대조운전과 미생물제재 주입 운전을 순차적으로 실시하였다. 대조운전 및 미생물제재 주입 운전에서 처리 수질은 TN 제거율이 거의 유사하였으나, COD는 미생물제재 주입 운전에서 약 32% 높은 제거율을 나타내었다. 또한, MLSS 총 량 변화량은 대조운전에서 8,154 g, 미생물제재 주입 운전에서 6,496 g으로 나타나서 미생물제재를 주입하는 경우 약 20%의 슬러지가 저감됨을 확인할 수 있었다. Pilot 실험의 장치 구성의 한계를 개선하고 장시간 운전을 실시하여 미생물 의 활성도를 높인다면, 미생물제재의 특성이 충분히 발휘되는 것에 의해 더 높은 슬러지 발생량 감소 효과를 얻을 수 있 을 것으로 판단된다.