Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 734, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.139470
Keywords
Anammox; Sludge aggregation; Enzymatic hydrolysis; Polysaccharide self-assembly; XDLVO theory
Categories
Funding
- National Natural Science Foundation of China [51878091, 21876016]
- graduate research and innovation foundation of Chongqing, China [CYB19028]
- National Key Research and Development Program of China [2019YFD1100501]
- Science and Technology Innovation Foundation of Chongqing [cstc2018jcyjAX0638]
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The high aggregation ability of anammox granular sludge is an issue of wide concern; however, the mechanism needs to be further clarified. In this study, selective hydrolysis experiments were performed to determine the role of exopolysaccharide (PS) branched chains and proteins for the aggregation mechanism of anammox granular sludge. The results revealed that selective hydrolysis of proteins hardly affected the granular aggregation while the hydrolysis of PS branched chains led to a decrease in the sludge zeta potential by 17.3% (beta-amylase group) and 24.1% (isoamylase group), a decrease of hydrophobicity by 11.6% (beta-amylase group) and 17.7% (isoamylase group), an increase of surface free energy by 36.8% (beta-amylase group) and 55.1% (isoamylase group) and the deterioration of the PS self-assembly ability. In addition, FTIR and XPS spectra analysis showed that the disruption of PS branched chains resulted in a higher proportion of hydrophilic and electronegative groups, which hindered bacterial aggregation, which was further confirmed by XDLVO theory. The key role of the PS chain structure in sludge aggregation is a critical finding of this work that provides helpful insights for the application of anammox process.
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