SIMULTANEOUS REMOVAL OF ORGANIC-CARBON AND NITROGEN BY A PLUNGING LIQUID JET BIOREACTOR WITH CROSS-FLOW FILTRATION OPERATED UNDER ZONE-LIMITED AERATION

Simultaneous removal of organic carbon and nitrogen by a plunging liqu id jet bioreactor with crossflow filtration was investigated under zon e-limited aeration conditions in which dispersion of air bubbles was l imited to the upper zone of the reactor, In the suspended growth syste m, TOC removal was about 95%, and nitrogen removal was about 45%. To e nhance the nitrogen removal performance, biomass carrier was loaded in to the reactor. In the attached growth system, nitrification proceeded successfully and the nitrogen removal was much improved. TOC and nitr ogen removal efficiencies were about 98% (the effluent TOC concentrati on was about 2 g/m(3)) and 75% (the effluent T-N concentration was abo ut 3 g/m(3)), respectively. organic carbon and nitrogen removal was ca rried out by the reactor in the attached growth system. layer deposit on the membrane acted as a dynamically formed ultrafiltration membrane , The removal of organic carbon and nitrogen by the cake layer largely contributed to the overall performance. It was concluded that the bio reactor system operated under zone-limited aeration had high potential ity for the small-scale treatment of domestic wastewater.