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DOI : ,    Vol.12, No.4, 61 ~ 67, 2004
Title
A Study on High-rate Biofilter Processes in Improving the Effluents of Wastewater Treatment Plants
현길수 Kil Soo Hyun , 최정우 Jeung Woo Choi , 심창석 Chang Suk Sim
Abstract
The water bodys of river and reservoir have been contaminated from the effluent of the existing wastewater treatment plants mostly adopted activated sludge processes, which have treated a mixtured wastewater of domestic wastewater, night-soil, and leachate from the waste landfill site. This researches with biofilters were conducted to improve the effluents of water and wastewater treatment plants. The biofilters consist of the aerated filter with single-media layer for water treatment and anaerobic-aerobic filters for wastewater treatment. The experiments of pilot-scale plants were conducted at the field of water and wastewater treatment plants. Based on the results of this researches, COD removal of anaerobic granule biofilter was more than 90%, but COD removal decreased to less than 60% due to inhibition of ammonia when influent NH^(+)₄-N concentration was high level of 400mg/L above, which indicate the ratio of COD/NH^(+)₄-N of less than 5 was desirable to improve the quality of effluent. For the anaerobic-aerobic biofilter, on the other hand, at the influent loadings of 0.07-0.64 kgBOO/m3.d, 0.07-0.38 kgCOD/m³.d, 0.025-0.141 kgTN/m³.d, 0.004-0.026 kgTP/m³.d, the percentages of BOD, COD, T-N and T-P removals averaged from 70 to 90% with all effluent of less than 10 mgT-N/L and 1mgT-P/L. These results show the effluent of anaerobic-aerobic Biofilter will be reused as various purpose as if it will be introduced to the existing wastewater treatment system adopted activated sludge processes.
Key Words
water body, mixtured wastewater, anaerobic-aerobic high-rate biofilter, anaerobic granule biofilter, existing wastewater treatment system
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