A pilot study by Pedros and Dobie (4608-4615) has been used to demonstrate how the SAGB process is adapted for nitrogen removal. A biological aerated filter which is a type of SAGB was set in series and positioned downstream of a denitrification unit. It indicated a recirculation of â€œ300% inflow from the filter back to the denitrification unit eliminating nitrogen and organics to desired levelsâ€ (Yoshinobu et al., 1997). There was a single biological aerated filter that had a separate anoxic zone within the reactor. This was used for the combined removal of nitrogen and organics (Rogalla & Bourbigot, 1990). The use of single-units to accomplish the removal of organics and nitrogen is an innovative process variation.
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