Anaerobic processes have been applied to treat low-strength domestic wastewaters with significant energy saving. However, anaerobic process effluents must be further removed of residual organics and total nitrogen before discharge. Reported here are an aerobic entrapped bio-technology (EBT) system and an EBT coupled with activated sludge (EBT + AS) system being tested as a post-anaerobic treatment. Both systems have been operated under aerobic condition to provide organics and total nitrogen removal, achieving COD removal by 74–88% and TN removal by 58–65% at hydraulic retention times of 8–24 h. ΔCOD/ΔNO₃ ratios that represent the carbon usage efficiency as electron donors for denitrification were 1.82–1.93 in the EBT and 2.01–2.02 in the EBT + AS systems, with both ratios being lower (i.e. more efficient) than 6 typically required in traditional activated sludge bioreactors. Both systems demonstrate promise for polishing removal of COD and TN.

厌氧工艺已被用于处理低强度的生活废水，具有显着的节能效果。但是，在排放之前，必须进一步除去厌氧工艺废水中的残留有机物和总氮。此处报告的是一种需氧截留生物技术（EBT）系统和与活性污泥（EBT + AS）系统耦合的EBT，正在进行厌氧后处理测试。两种系统都在有氧条件下运行，以去除有机物和总氮，在8-24小时的水力停留时间实现COD去除74-88％，TN去除58-65％。ΔCOD/ΔNO ₃代表反硝化电子供体的碳使用效率的比率在EBT中为1.82-1.93，在EBT + AS系统中为2.01-2.02，这两个比率均比传统活性污泥生物反应器中通常要求的6更低（即更有效）。两种系统都显示出抛光去除COD和TN的希望。