Effect of settling time on aerobic granulation in sequencing batch reactor
Effect of settling time on aerobic granulation in sequencing batch reactor
复制标题
DOI：
10.1016/j.bej.2004.03.005
复制
发表时间：
2004-09-01
影响因子：
3.9
通讯作者：
Tay, JH
中科院分区：
文献类型：
--
作者：
Qin, L;Liu, Y;Tay, JH
在四柱式序批式反应器（R1-R4）中研究了水力沉降时间在好氧颗粒污泥形成中的重要作用。结果表明，在最短沉降时间为5 min的R4中，好氧颗粒污泥被成功培养并占优势，而在沉降时间为20、15和10 min的R1-R3中，分别观察到好氧颗粒污泥和悬浮污泥的混合物。达到稳定状态后，R1-R3的沉降时间分别从20 min缩短到5 min，从15 min缩短到2 min，从10 min缩短到1 min，运行2周后，好氧颗粒污泥完全取代了3个反应器中的悬浮污泥。发现细胞表面疏水性在较短的沉降时间内显着改善。对好氧颗粒污泥中多价金属含量的分析表明，钙在好氧颗粒污泥中的积累与沉淀时间有关，而铁、镁、铝的总含量远低于颗粒污泥中钙的含量，且基本保持不变。很明显，短的沉降时间有利于好氧颗粒化，人们可以期望通过控制沉降时间来操纵好氧颗粒的形成和特性。(C)2004 Elsevier B. V.保留所有权利。
The essential role of hydraulic settling time in the formation of aerobic granules was studied in four column sequencing batch reactors (R1-R4). Results showed that aerobic granules were successfully cultivated and became dominant only in the R4 operated at the shortest settling time of 5 min, while a mixture of aerobic granules and suspended sludge was observed in R1-R3 run at settling times of 20, 15 and 10 min, respectively. After the steady state was achieved, the respective settling times of R1-R3 was shortened from 20 to 5 min, from 15 to 2 min and from 10 to I min; as the result, aerobic granules completely displaced suspended sludge in these three reactors after two-week operation. It was found that cell surface hydrophobicity was improved significantly at short settling times. Analyses of the polyvalent metals contents in aerobic granules showed that the accumulation of calcium in aerobic granules was related to the settling time, however, the total content of iron, magnesium and aluminium in aerobic granules was much pretty lower than the granule calcium content and almost remained constant. It is obvious that a short settling time favours aerobic granulation, and one may expect to manipulate the formation and characteristics of aerobic granules by controlling settling time. (C) 2004 Elsevier B.V. All rights reserved.