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This is the first study to achieve a short HRT (∼2h for the A/O reactor), high MLSS (∼10gL−1), and high volumetric loading (∼3.7kg CODm−3d−1 and ∼0.6kg NH4-Nm−3d−1) in the A/O process for sewage treatment by enhancing biomass retention in the secondary clarifier (∼4h settling time), which we refer to as the high-performance A/O process (HP-A/O) in this paper. Over 258days of continuous operation,...
This study investigated the long-term treatment performance of a conventional activated sludge (AS) process operating at a microaerobic DO level (0.5–1.0mg·L−1) in the aeration tank and a long settling time of >10h in the clarification tank for sewage treatment. The microaerobic DO conditions led to severe sludge bulking. However, good sludge/water separation and excellent pollutant removal performance...
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