Zheng Yu-Ming, Yu Han-Qing, Liu Shuang-Jiang, Liu Xing-Zhong
School of Chemistry, University of Science and Technology of China, Hefei, Anhui.
Chemosphere. 2006 Jun;63(10):1791-800. doi: 10.1016/j.chemosphere.2005.08.055. Epub 2005 Nov 15.
The cultivation and instability of aerobic granular sludge in a sequencing batch reactor under high loading conditions were investigated. Compact bacteria-dominated aerobic granules with a mean diameter of 1 mm were formed at a chemical oxygen demand (COD) loading rate of 6.0 kg m(-3) d(-1) within 30 d. However, the compact bacteria-dominated aerobic granules were not stable and transited to large-sized filamentous ones gradually. With the formation of bacteria-dominated granules, the hydrophobicity and specific gravity of the sludge increased. When the granules were transited to filamentous ones, the hydrophobicity and specific gravity decreased. Both granules had a high COD removal efficiency, excellent settling ability and showed a clear, regular round-shaped outline. After the filamentous granules reached a diameter of 16 mm, due to the mass transfer limitation and the possible presence of anaerobes in the inner part of the granules, they began to disintegrate and be washed out of the reactor, follow by failure of the reactor.
研究了序批式反应器中高负荷条件下好氧颗粒污泥的培养及不稳定性。在化学需氧量（COD）负荷率为6.0 kg m(-3) d(-1)时，30天内形成了以密实菌为主的平均直径为1 mm的好氧颗粒。然而，以密实菌为主的好氧颗粒不稳定，逐渐转变为大型丝状颗粒。随着以细菌为主的颗粒形成，污泥的疏水性和比重增加。当颗粒转变为丝状颗粒时，疏水性和比重降低。两种颗粒都具有较高的COD去除效率、良好的沉降能力，且呈现出清晰、规则的圆形轮廓。丝状颗粒直径达到16 mm后，由于传质限制以及颗粒内部可能存在厌氧菌，它们开始解体并被冲出反应器，随后反应器失效。
