| Title |
Biological Wastewater Treatment Using Waste Oyster - Shell as Biofilm Media |
| Authors |
문병현 ; 이택순 ; 서정윤 ; 서희정 ( Byung Hyun Moon ; Taek Soon Lee ; Jeoung Yoon Seo ; Hee Jung Seo ) |
| Abstract |
This study was conducted to use waste oyster shell as biofilm media for biological wastewater treatment. The comparison between the activated sludge and the submerged biofilm process with oyster shell media (5% of reactor volume) for domestic sewage treatment was made at various hydraulic retention times. The effluent quality of the submerged oyster shell reactor was more stable than that of activated sludge reactor. The BOD removal efficiencies of the submerged process was above 80% at the various organic loading rates of 0.12∼0.55㎏BOD/㎥/day. The COD and SS removal efficiencies of the submerged process were higher than that of the activated sludge process. Also, TKN and T-P removal efficiencies of submerged process were higher than that of the activated sludge process. The comparison between the submerged biofilm process with oyster shell media of 10% and 18% was made at various loading rates. The hydraulic retention time was fixed to 6hr. The BOD, COD_(Cr) removal efficiencies of 10% and 18% were above 80% at organic loading rates of 1.0㎏ BOD/㎥/day and 1.5㎏COD_(Cr)/㎥/day but the removal efficiencies of 18% reactor decreased as the organic loading rates were increased. The TKN removal efficiencies of 10% and 18% were above 70% at organic loading rates of 0.2㎏ TKN/㎥/day. However, the removal efficiencies of 18% reactor decreased at the higher loading rates. The phosphorus removal efficiencies of both reactors showed similar removal efficiencies. |