Journal
BIORESOURCE TECHNOLOGY
Volume 192, Issue -, Pages 514-521Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.06.019
Keywords
Slime extracellular polymeric substances; Sludge flocs; Sludge dewaterability; Filamentous fungus
Funding
- National Natural Science Foundation of China [21307059]
- Fundamental Research Funds for the Central Universities [KJQN201435]
- Jiangsu Province Science Foundation for Youths [BK20130667]
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Mechanisms responsible for the sludge dewaterability enhanced by filamentous fungi during fungal treatment of sludge were investigated in the present study. The filamentous fungus Mucor sp. GY-1, isolated from waste activated sludge, enhanced sludge dewaterability by 82.1% to achieve the lowest value of normalized sludge specific resistance to filtration (SRF), 8.18 x 10(10) m.L/kg.g-TSS. During the fungal treatment of sludge, 57.8% of slime extracellular polymeric substances (EPS) and 51.1% of polysaccharide in slime EPS were degraded, respectively, by Mucor sp. GY-1, contributing to the improvement of sludge dewaterability. Slime EPS is much more available for Mucor sp. GY-1 than either LB-EPS or TB-EPS that bound with microbial cells. In addition, filamentous fungus Mucor sp. GY-1 entrapped small sludge particles and inhibited the destruction of sludge flocs larger than 100 mu m, thus enhancing sludge dewaterability, during fungal treatment of sludge using Mucor sp. GY-1. (C) 2015 Elsevier Ltd. All rights reserved.
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