순환식 회전원판법에 의한 하수의 생분해 성능 평가

The Biodegradability Estimation of Sewage Using Rotating Biological Contactors with Recycling

This study was accomplished to estimate the biodegradability of sewage using RBC(Rotating Biological contactors) and to get a basic data for design parameters. RBC systems were applied to laboratory scale reactors with varying HRT feeding sewage as of about BOD 70 mg/l. 80 mg/l and 120mg/l, respectively. According to the continuous operation, it showed that RBC w/ recycling was similar to RBC w/o recycling in organic removal efficiency or TP removal efficiency, but neither system effectively removed TN. To get the above 90% of BOD removal efficiency, both were recommended to design as BOD organic loading rate was less than about 4.5 to 6.0 g/㎡/d, hydraulic loading was less than about 80ℓ/㎡/d. It showed that RBC w/ recycling was inferior to RBC w/o recycling in TN removal efficiency. At the 5.0g/㎡/d, TN removal efficiency of RBC w/ recycling and RBC w/o recycling was about 50%, 70%, respectively. SNR(Specific Nitrification Rate) was tending to increase as shorter HRT. SNR of RBC w/ recycling and RBC w/o recycling was 0.4 mgNH ₄⁺-N/gMv/hr, 0.7 to 1.0 mgNH₄⁺-N/gMv/hr, respectively.