A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Characterization of Lectins and Bacterial Adhesins in Activated Sludge Flocs
Bacterial lectins are carbohydrate‐binding proteins that are involved in bacterial adhesion and aggregation. To investigate whether lectins are involved in floc formation of activated sludge, hemaaggultination (HA) and HA inhibition assays were conducted on extracellular polymeric substances (EPS) extracted from activated sludges. Six sludges from both full‐scale and synthetic chemical‐fed laboratory activated sludge systems were subjected to EPS extraction and lectin assay. Activated sludge EPS resulted in strong agglutination with trypsin‐treated human red blood cells. While simple monosaccharides failed to exhibit inhibition of agglutination, several glycoproteins clearly reversed agglutination, indicating that glycoprotein (oligosaccharide)‐specific lectins are present in activated sludge. This inhibitory pattern was the same for both the field and laboratory‐grown activated sludges, indicating that these lectins are indigenously generated by activated sludge microorganisms. The major lectin activities were found to be present in a hydrophobic region of EPS. The activities remained unaffected after heat and urea treatment of EPS, but were significantly reduced by the ethylenediaminetetraacetic acid (EDTA) treatment. These results share similar properties with previously studied pure culture bacterial lectins and support the conclusion that lectin‐mediated bacterial aggregation is one of the mechanisms responsible for activated sludge bioflocculation.
Characterization of Lectins and Bacterial Adhesins in Activated Sludge Flocs
Bacterial lectins are carbohydrate‐binding proteins that are involved in bacterial adhesion and aggregation. To investigate whether lectins are involved in floc formation of activated sludge, hemaaggultination (HA) and HA inhibition assays were conducted on extracellular polymeric substances (EPS) extracted from activated sludges. Six sludges from both full‐scale and synthetic chemical‐fed laboratory activated sludge systems were subjected to EPS extraction and lectin assay. Activated sludge EPS resulted in strong agglutination with trypsin‐treated human red blood cells. While simple monosaccharides failed to exhibit inhibition of agglutination, several glycoproteins clearly reversed agglutination, indicating that glycoprotein (oligosaccharide)‐specific lectins are present in activated sludge. This inhibitory pattern was the same for both the field and laboratory‐grown activated sludges, indicating that these lectins are indigenously generated by activated sludge microorganisms. The major lectin activities were found to be present in a hydrophobic region of EPS. The activities remained unaffected after heat and urea treatment of EPS, but were significantly reduced by the ethylenediaminetetraacetic acid (EDTA) treatment. These results share similar properties with previously studied pure culture bacterial lectins and support the conclusion that lectin‐mediated bacterial aggregation is one of the mechanisms responsible for activated sludge bioflocculation.
Characterization of Lectins and Bacterial Adhesins in Activated Sludge Flocs
Park, Chul (author) / Novak, John T. (author)
Water Environment Research ; 81 ; 755-764
2009-08-01
10 pages
Article (Journal)
Electronic Resource
English
Advective transport in activated sludge flocs
| Wiley | 1992
Factors affecting dispersion of activated sludge flocs
| Wiley | 1993
Bacterial adhesins: function and structure
| British Library Online Contents | 2000
Hydrophobicity of activated sludge flocs and laboratory-grown bacteria
| British Library Conference Proceedings | 1994
Spatial arrangement of the components of activated sludge flocs
| British Library Conference Proceedings | 1994