Revealing calcium ion behavior during anaerobic phosphorus release process in aerobic granular sludge system
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
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Detail(s)
| Original language | English |
|---|---|
| Article number | 128474 |
| Journal / Publication | Bioresource Technology |
| Volume | 369 |
| Online published | 9 Dec 2022 |
| Publication status | Published - Feb 2023 |
Link(s)
Abstract
Calcium ions (Ca2+) are important for biological phosphorus (P) removal from wastewater, but its behavior has not been well documented during the anaerobic P release process. This study is aimed to explore the mechanisms of Ca2+ release in bacterial aerobic granular sludge (AGS) system. During the non-aeration (anaerobic) phase, nearly 40 % increase in Ca2+ concentration was detected at the bottom of AGS reactor where decrease in pH and increase in Mg2+ concentration occurred. The pH decrease due to anaerobic P release caused CaCO3 dissolution inside the granules, leading to Ca2+ release. In addition, the increased Mg2+ ions from hydrolysis of polyphosphates were detected to reversibly exchange with Ca2+ in granules at a molar ΔCa/ΔMg ratio of 0.51–0.65. Results from this work revealed that dissolution of CaCO3 and ions exchange between Ca2+ and Mg2+ were the two major contributors to Ca2+ release during anaerobic P release process.
Research Area(s)
- CaCO3 dissolution, Calcium release, Ion exchange, Magnesium release
Citation Format(s)
Revealing calcium ion behavior during anaerobic phosphorus release process in aerobic granular sludge system. / Wang, Jixiang; Li, Zejiao; Wang, Qian et al.
In: Bioresource Technology, Vol. 369, 128474, 02.2023.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
