Yilmaz Gulsum, Bozkurt Umit, Magden Karin Aleksanyan
Department of Environmental Engineering, Faculty of Engineering, Istanbul University, Avcilar, 34320, Istanbul, Turkey.
Biodegradation. 2017 Feb;28(1):53-68. doi: 10.1007/s10532-016-9777-2. Epub 2016 Oct 21.
Aerobic granulation is a promising technology for wastewater treatment, but problems regarding its formation and stability need to be solved. Divalent metal ions, especially Ca, Mg and Mn, have been demonstrated to play an important role in the process of aerobic granulation. Here, we studied whether iron ions can affect aerobic granulation. Granular sludge formed without iron ion addition (<0.02 mg Fe L) was fluffy and had a finger-type structure and filamentous out-growth. The addition of iron ions to concentrations of 1 and 10 mg Fe L repressed the finger-type structure and filamentous out-growth. The results show that chemical precipitation in the granules with iron ion addition was higher than that in the granules without ferrous addition. The amount of precipitates was higher inside the granules than outside. This study demonstrates that iron ions (Fe/Fe) increase the size and stability of aerobic granular sludge but do not affect the granulation time, which is the time that the first granular sludge is observed. The study shows that aerobic granular sludge technology can be confidently applied to actual wastewater containing a high concentration of iron compounds.
好氧颗粒化是一种很有前景的废水处理技术，但关于其形成和稳定性的问题仍有待解决。二价金属离子，尤其是钙、镁和锰，已被证明在好氧颗粒化过程中发挥着重要作用。在此，我们研究了铁离子是否会影响好氧颗粒化。在不添加铁离子（<0.02 mg Fe/L）的情况下形成的颗粒污泥蓬松，具有指状结构和丝状菌生长。添加铁离子至浓度为1和10 mg Fe/L时，抑制了指状结构和丝状菌生长。结果表明，添加铁离子的颗粒中化学沉淀高于未添加亚铁的颗粒。颗粒内部的沉淀物量高于外部。本研究表明，铁离子（Fe²⁺/Fe³⁺）增加了好氧颗粒污泥的尺寸和稳定性，但不影响首次观察到颗粒污泥的造粒时间。该研究表明，好氧颗粒污泥技术可放心应用于含有高浓度铁化合物的实际废水中。
