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Reuse Possibility of By-pass Flow and Secondary Effluent using BAF  

An, J.H. (Department of Civil & Environmental Engineering, Korea University)
Park, J.B. (The Korean Intellectual Property Office)
Kim, S.W. (Department of Civil & Environmental Engineering, Korea University)
Park, J.H. (Department of Civil & Environmental Engineering, Korea University)
Ha, J.S. (Department of Civil & Environmental Engineering, Korea University)
Choi, E. (Department of Civil & Environmental Engineering, Korea University)
Publication Information
Journal of Korean Society on Water Environment / v.21, no.2, 2005 , pp. 190-195 More about this Journal
Abstract
The laboratory and pilot scale BAFs (biological aerated filters) were operated with 0.3 hr to 1.1 hr EBCT(empty bed contact time) at a maximum filtration rate of $472m^3/m^2/day$ as a treatment method for reuse of secondary effluent and by-pass flow in this study. The effluent BOD and SS were generally 3.5 to 5 mg/L and 2 to 3 mg/L, respectively with 2ndary effluent, but the SS concentrations increased to 4 to 8 mg/L with the increased flow rates of by-pass flow. Potential nitrification rates were very high, but the nitrogen removal efficiencies were low due to the limited carbon sources. Bypass of a part of primary effluent seemed to be desirable to increase the nitrogen removal. Disinfection must be furnished for the reuse of BAF effluent.
Keywords
BAF; First flush; Nitrification; Reuse; Tertiary treatment; Reuse;
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