Calcium spatial distribution in aerobic granules and its effects on granule structure, strength and bioactivity

Publication: Research - peer-reviewJournal article – Annual report year: 2008

Without internal affiliation

  • Author: Ren, Ting-Ting

    University of Science and Technology of China

  • Author: Liu, Li

    University of Science and Technology of China

  • Author: Sheng, Guo-Ping

    University of Science and Technology of China

  • Author: Liu, Xian-Wei

    University of Science and Technology of China

  • Author: Yu, Han-Qing

  • Author: Zhang, Ming-Chuan

    Beijing Normal University

  • Author: Zhu, Jian-Rong

    Beijing Normal University

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Calcium-rich aerobic granules were cultivated after 3-month operation. The chemical form and spatial distribution of calcium in the granules and their physicochemical characteristics were explored. Examination with a scanning electron microscope combined energy dispersive X-ray detector (SEM–EDX) shows that Ca was mainly accumulated in the core of the granules. CaCO3 was found to be the main calcium precipitate in the granules. The fluorescent in situ hybridization (FISH) analysis shows that the cells were crowded in the outer layer and gathered in clusters. Compared with the granules without Ca accumulation, the Ca-rich granules had more rigid structure and a higher strength. However, their specific oxygen uptake rate (SOUR) reduced after the Ca accumulation inside them. Comparison between the SOUR values of the granules with and without Ca accumulation suggests that Ca accumulated in the aerobic granules might have a negative effect on their bioactivity.
Original languageEnglish
JournalWater Research
Publication date2008
Volume42
Issue13
Pages3343-3352
ISSN0043-1354
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 33
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