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DOI : ,    Vol.11, No.1, 71 ~ 78, 2003
Title
Prediction of the Wastewater Quality and Design of Pretreatment System for the Wastewater Mixed Domestic wastewater with Night-soil and Leachate
최정우 Jeung Woo Choi , 현길수 Kil Soo Hyun , 송인수 In Soo Song
Abstract
Using anaerobic-oxidation biofilm process(AOBP), rotating biological contactor(RBC), biological aerobic filtration (BAF), activated sludge(AS), and coagulation-sedimentation (C-S) processes as a pretreatment processes of the mixtured wastewater, this research were performed to investigate on the characteristics of the pretreatment processes and to predict the wastewater qualities mixed domestic wastewater with the mixtured wastewater of night soil and leachate, considered the reduction of organic loadings. Hydraulic retention time (HRT) of the pretreatment processes were in the range of 9 -10 hours for the AOBP, 10-12 hours for the RBC, 7-8 hours for the BAF, and 7-8 hours for the AS. The C-S experiment was carried out by Jar tester. As a results, the biofilm treatment processes(BTP) such as AOBP. RBC and BAF showed more effective 71-76% for COD, 42-64% for T-N, and 58-70% for T-P than AS and C-S, respectively. For the removal of heavy metal of Cr^(+6), the BTP as well as the C-S was extremely more effective about 50% than the AS. It indicated that the BTP was more stable and effective process as a pretreatment processes of the mixtured wastewater, compared to the AS and the C-S processes. Applied organic reduction rates of 30% and 60% by the RTP for the prediction of mixtured wastewater, the reduction efficiencies of it were 32% and 39% for COD, 10% and 15% for T-N, and 16% and 20% for T-P, respectively. Despite of the increase of two times in reducing organic loadings, the reduction efficiencies of 4∼7% resulted in an ineffective operation of the BTP.
Key Words
anaerobic-oxidation biofilm process, AOBP, rotating biological contactor, RBC, biological aerobic filtration, BAF, activated sludge, AS, and coagulation-sedimentation, C-S, processes, pretreatment processes, mixtured wastewater
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