Two primary advantages of a submerged attached growth bioreactor (SAGB) are the small volume requirement and the elimination of downstream clarification. While different configurations of SAGBs have been developed for various applications, the use of a single SAGB for achieving the combined removal of organics and nitrogen has not been extensively studied. This research studied the microbial kinetics of a multispecies biofilm within a single-unit, single-zone SAGB designed to achieve the combined removal of both carbonaceous organics and nitrogen. A pilot-scale SAGB plant was developed and operated to treat a municipal wastewater to an effluent BOD5≤30 mg/l, TSS≤30 mg/l, and total nitrogen≤10 mg/l. At a total organic loading of 4.0 kg/m3-day adequate nitrogen removal, resulting in an effluent total nitrogen of 8.5 mg/l, was achieved. The numerical simulation of reactor performance using AQUASIM showed good agreement in overall trends. This research demonstrated an expanded and improved application of a multispecies biofilm process for wastewater nutrient removal.
Experimental and numerical results of a single submerged attached growth bioreactor for simultaneous oxidation of organics and nitrogen removal
P.B. Pedros, J.Y. Wang, W.K. Dobie, H. Metghalchi; Experimental and numerical results of a single submerged attached growth bioreactor for simultaneous oxidation of organics and nitrogen removal. Water Sci Technol 1 October 2005; 52 (7): 97–105. doi: https://doi.org/10.2166/wst.2005.0187
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