1. Comparison of Mg- and Ca-enhancing anaerobic granulation in an expanded granular sludge-bed reactor.
- Author
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Cao, XiaoLei, Sheng, YuXing, Cao, HongBin, and Zhang, Yi
- Abstract
The mechanisms responsible for the fast granulation of anaerobic sludge caused by Mg and Ca addition was examined in four lab-scale expanded granular sludge bed (EGSB) reactors. Results indicated that both Mg and Ca accelerated the sludge-granulation process and increased the amount of polysaccharides and proteins in the sludge. Energy dispersive x-ray spectrometry (EDX) analysis revealed that, in a mature granule, both Mg and Ca composed as phosphate and calcium was distributed primarily in the periphery of the granule, while magnesium distributed mainly in the interior. The addition of Mg was more favorable for the nuclei formation, whereas the addition of Ca was more favorable for subgranule growth and maintaining the granules' rigid structure. Results showed that the addition of Mg in the nuclei formation stage and Ca in the granule-growth stage accelerated granulation more than adding only one of them in the granulation process. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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