Abstract
The purpose of this study was to investigate the optimum condition of hydraulic behavior in MBBR (Moving Bed Biofilm Reactor) process under various operating conditions. As results of the tracer tests, it was found that the air injection amount/rate had an important influence on the hydraulic behavior in the reactor. However, the filling rate of the carrier did not affect the hydraulic flow. It is also observed that the selective operation of the air injection pipeline has little effect on the hydraulic behavior. The operation of the internal circulators reduces the short-circuit flow and the dead flow, and by inclining them, causing the up-down flow causes improve flow condition into to that of the ideal CSTR (Continuous Stirred Tank Reactor). Key words: MBBR (Moving Bed Biofilm Reactor), tracer test, short circuit flow, eddy flow, CSTR (Continuos Stirred Tank Reactor)
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