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http://dx.doi.org/10.17137/korrae.2021.29.4.33

Physico-chemical and biological characteristic analysis of stratified anaerobic granules in a full-scale UASB reactor  

Jo, Hongmok (Department of environmental science, Dongguk University)
Kim, Minsang (Department of environmental science, Dongguk University)
Shin, Seung Gu (Department of Energy Engineering, Future Convergence Technology Research Institute, Gyeongsang National University)
Cho, Si-Kyung (Department of environmental science, Dongguk University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.29, no.4, 2021 , pp. 33-40 More about this Journal
Abstract
In this study, the physico-chemical and biological characteristics of anaerobic granular sludge at different heights of a full-scale UASB reactor (UASBr) were investigated. Granular sludge was taken from 1 m, 2 m, and 3 m above the ground level in the UASBr. The morphological analysis showed that the upper part had bigger granules and the lower part had rounder granules. The ANOVA test confirmed that the mean size and the roundness of the granules had statistically significant difference along the height at 95% confidence level, and there was a significant negative linear relationship between the size and roundness (r=-0.40, p<0.05). A SMA test using acetic, propionic and butyric acids showed that granules from 2 m height had the highest specific methanogenic activity. The EPS contents were also unequal to each height, with 2 m showing the highest content. These findings could be helpful to understand the different characteristics of stratified anaerobic granules in full-scale UASBr and maintain the reactor performance.
Keywords
Anaerobic digestion; UASBr; Stratification; Granular sludge; SMA test; ANOVA;
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