Investigation of Nitrification and Nitrogen Removal from Centrate in a Submerged Attached Growth Bioreactor

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The purpose of this study was to investigate the nitrification and nitrogen removal from centrate produced in the dewatering process of an anaerobically digested sludge, using a single-unit, single-zone submerged attached growth bioreactor (SAGB). The nitrogen loading varied from 0.54 - 1.51 kg-N/m3-day and the organic loading varied from 0.07 – 0.64 kg-bCOD/m3-day. The quantity the biomass in terms of volatile solids (VS) ranged from 10,123 to 16,034 mg-VS/l of media. The quantity of suspended solids in the interstitial volume of the reactor averaged 76
mg-VS/l. A nitrification efficiency of 98% was achieved while the denitrification efficiency varied from 84% to 99% (with methanol). Inhibition of nitrite oxidation by free ammonia resulted in the accumulation of nitrite, while inhibition of ammonia oxidation by free nitrous acid did not occur.

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