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Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge
Published on: September 26, 2016
Recovery of dehydrated aerobic granules: A comparison
Yi Lv1, Chunli Wan2, Duu-Jong Lee3
1Department of Geography and Environmental Science, Shandong Normal University, 88 East Wenhua Road, Jinan 250014, China; Department of Environmental Science and Engineering, Shandong University, 48 South Shanda Road, Jinan 250100, China.
Abstract:
Dehydrated aerobic granules, if can be sufficiently recovered without significant loss of structural stability and biological activities, presents a promising long-time storage option in practical use. This study dehydrated aerobic granules by six protocols: air drying at 25 or 50 °C, freeze-dry, acetone or ethanol dehydration, and microwave heating, and then recovered them in liquid medium, with the measured characteristics being reported. The granule stability has no correlation with measured settleability, hydrophobicity or extracellular polymeric substances compositions; instead, is correlated with the functional strains presented in the recovered granules. Air dry dehydration minimally damage the functional strains including genus Brevundimonas and genus Comamonas and markedly deteriorated structural breaker such as Acinetobacter of Moraxellaceae to lead to stable and tough recovered granules.
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