期刊
BIORESOURCE TECHNOLOGY
卷 154, 期 -, 页码 178-184出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.12.033
关键词
P-rich granules; Chemical precipitation; Filamentous bacteria; Simultaneous nitrification-denitrification via nitrite
资金
- National Hi-Tech Research and Development Program of China (863) [2011AA060902]
- Science and Technology Commission of Shanghai Municipality (STCSM) [11230700700]
Lab-scale experiments were conducted to investigate the aerobic granular sludge process for simultaneous phosphorus (P) accumulation by chemical precipitation and biological nitrogen removal via nitrite. The P-rich granules were successfully incubated in a sequencing batch reactor, in which simultaneous nitrification-denitrification occurred via nitrite. The average diameter of the P-rich granules was 2.47 mm and the P content in granules was much higher than that in other granular systems with enhanced biological phosphorus removal process. Filamentous bacteria (genus Thiothrix) in the granules and the long sludge retention time (30 d) of the granular system played a crucial role in accumulation of precipitated phosphate. X-ray diffraction analysis, scanning electron microscopy coupled with energy dispersive X-ray and the experimental design using response surface methodology confirmed that the main mineral patterns in P-rich granules were Ca-Mg phosphate and whitlockite. (C) 2013 Elsevier Ltd. All rights reserved.
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