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Pre-treatment of River Water Using Biological Aerated Filtration  

Choi, Dong-Ho (Korea Water Resources Corporation Water Resources Research Institute)
Choi, Hyung-Joo (Department of Civil and Environmental Engineering, Hanyang University)
Bae, Woo-Keun (Department of Civil and Environmental Engineering, Hanyang University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.3, 2006 , pp. 276-285 More about this Journal
Abstract
When polluted stream water was treated with biological aerated filter(BAF) in pilot plant, all operation with 90, 60, 45 and 30 min of EBCT at fixed $0.1m^3air/m^2min$ of aeration showed 80% or higher treatment efficiency of particle materials(SS, turbidity and Chl.-a) and 85% or higher efficiency of ammonia nitrogen removal. It was thought that, in case of BOD, biological stability may sufficiently be assured with BAF because grade III or IV inflow water was changed to grade I for outflow water. In case of $COD_{Mn}$, about 60% of removal efficiency was found. When the mechanism of the result was investigated, about 30% of COD materials was produced by algae clogged in the reactor. There was almost no biological decomposition because specific substrate utilization rate of algogenic organic materials were $0.0245mg{\cdot}COD_{Mn}/mg{\cdot}VSS{\cdot}day$, thus partial backwashing(washing the media in 1 m upper of the reactor once a day) was required. It is thought that elevation of removal rate about 10% of $COD_{Mn}$ and 5.5% of $BOD_5$ could be obtained with partial backwashing resulting in assurance of biologically more stable raw water and that saving backwashing water may be significant.
Keywords
Biological Aerated Filter; Empty Bed Contact Time; Algogenic Organic; Biofilm; Partial Backwashing;
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