کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4485467 | 1316954 | 2008 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Calcium spatial distribution in aerobic granules and its effects on granule structure, strength and bioactivity Calcium spatial distribution in aerobic granules and its effects on granule structure, strength and bioactivity](/preview/png/4485467.png)
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.
Journal: Water Research - Volume 42, Issue 13, July 2008, Pages 3343–3352