Environmental Engineering Department, Middle East Technical University, Ankara, Turkey; Environmental Engineering Department, Abdullah Gul University, Kayseri, Turkey.
Bioresour Technol. 2013 Nov;148:149-56. doi: 10.1016/j.biortech.2013.08.096. Epub 2013 Aug 29.
The effects of period sequence (anoxic-aerobic and aerobic-anoxic) on aerobic granulation from suspended seed sludge, and COD, N removal efficiencies were investigated in two sequencing batch reactors. More stable granules with greater sizes (1.8-3.5mm) were developed in R1 (anoxic-aerobic sequence). Yet, no significant difference was observed between the reactors in terms of removal efficiencies. Under optimum operational conditions, 92-95% COD, 89-90% TAN and 38-46% total nitrogen removal efficiencies were achieved. The anoxic-aerobic period sequence (R1) resulted in almost complete denitrification during anoxic periods while aerobic-anoxic sequence (R2) led to nitrate accumulation due to limited-carbon source and further granule disintegration. NH3-N concentration of 15-28 mg/L was found to inhibit COD removal up to 30%. This study also revealed the inhibitory sulfide production during anoxic periods. Sulfate concentration of 52.6-70.2mg/L was found to promote sulfate reduction and sulfide generation (0.24-0.62 mg/L) which, together with free-ammonia, inhibited TAN oxidation by 10-50%.
采用序批式活性污泥法（SBR），以悬浮污泥为接种污泥，分别考察了缺氧-好氧（A/O）和好氧-缺氧（A/O）两种运行方式对颗粒污泥形成及其 COD、N 去除效果的影响。结果表明，A/O 运行方式（R1）更有利于颗粒污泥的生长，形成的颗粒污泥粒径较大（1.8-3.5mm），而两种运行方式对 COD、N 的去除效果并无明显差异。在最佳运行条件下，COD、TAN 和总氮的去除率分别达到 92-95%、89-90%和 38-46%。A/O 运行方式（R1）在缺氧段实现了完全反硝化，而 A/O 运行方式（R2）由于碳源有限导致硝酸盐积累，进而导致颗粒污泥解体。发现氨氮浓度为 15-28mg/L 时会抑制 COD 去除，抑制率最高可达 30%。此外，本研究还揭示了缺氧段抑制性硫化物的产生。发现硫酸盐浓度为 52.6-70.2mg/L 时会促进硫酸盐还原和硫化物生成（0.24-0.62mg/L），这与游离氨一起，抑制了 TAN 氧化，抑制率为 10-50%。
