期刊
BIORESOURCE TECHNOLOGY
卷 123, 期 -, 页码 312-317出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.07.003
关键词
Anammox granule; Structure; Density; Settlability
资金
- National Natural Science Foundation of China [31070110]
- National High-Tech Research and Development Program (863) of China [2009ZZ06311]
- Research Fund for the Doctoral Program of Higher Education of China [20110101110078]
- Natural Science Foundation of Zhejiang Province [5100034]
Microscopic observation and settling test were carried out to investigate the structure, density and settlability of anammox granules taken from a high-rate upflow anaerobic sludge blanket (UASB) reactor. The results showed that the anammox granules were irregular in shape and uneven on surface, and their structure included granule, subunit, microbial cell cluster and single cell. The gas pockets were often observed in the anammox granules, and they originated from the obstruction of gas tunnel by extracellular polymer substances (EPSs) and the inflation of produced dinitrogen gas. The volume of gas pockets became larger with the increasing diameter of anammox granules, which led to the decreasing density and the floatation of anammox granules. The diameter of anammox granules should be controlled at less than 2.20 mm to avoid the granule floatation. A hypothesized mechanism for the granulation and floatation of anammox biomass was proposed. (C) 2012 Elsevier Ltd. All rights reserved.
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