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. Author manuscript; available in PMC: 2020 Jul 29.
Published in final edited form as: Water Res. 2017 May 13;121:72–85. doi: 10.1016/j.watres.2017.05.029

Figure 1.

Figure 1.

Continuous flow pilot-scale treatment train operated as a modified UCT process without nitrate recycling, simulating the configuration of the full-scale Nine Springs WWTP. The anaerobic (3 tanks), anoxic (1 tank), and aerobic (3 tanks) portions of the system were equipped with mechanical mixers. The internal recycle (QR1) returned biomass to the beginning of the system from the anoxic tank. Return activated sludge (QR2) was recycled from the bottom of the clarifier to the anoxic zone. Wasting (Qw) occurred from the last aerobic tank.