Journal
BIORESOURCE TECHNOLOGY
Volume 326, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.124778
Keywords
Anammox; Granules; Carrier; Activity; Intensity
Funding
- National Natural Science Foundation of China [31670510]
- Key Research and Development Program of Shaanxi Province in China [2019GY-154]
- China Scholarship Council (CSC)
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The newly developed carrier granular sludge (CGS) with gel beads assistance showed higher intensity and anammox activity than natural granular sludge (NGS). The gel beads provided a stable framework and unimpeded mass transfer, improving sludge activity and overall performance. The results suggest potential application of CGS in full-scale anammox processes.
The newly developed carrier granular sludge (CGS) with polyvinyl alcohol/chitosan (PVA/CS) and PVA/CS/Fe gel beads assistance showed higher intensity and anammox activity than the natural granular sludge (NGS). Through comprehensive investigation, it was found: (1) the gel beads provided a stable framework of cells entangle with extracellular polymeric substances (EPS) to enhance the sludge intensity. In this framework, beta-polysaccharides are distributed at the edge of CGS as a protection layer, a-polysaccharides and proteins are spread in the whole cross-section as backbones, and Fe2+/Fe3+ in CGS-PVA/CS/Fe act as bridges to link with the negatively charged groups on bacterial surfaces and proteins. (2) The porous gel beads satisfied a relatively unimpeded mass transfer. Thus, the sludge activity, microbe's metabolism, membrane transportation and environmental adaption in CGS were apparently improved. The results improved the understanding about the advantages of the CGS and indicated their possible application in full-scale anammox processes.
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