| Title: | Impact of septic compounds and operational conditions on the microbiology of an activated sludge system |
| Author(s): | Pelletier C; Fitzsimmons MA; Deschenes S; Paice M; |
| Address: | "Paprican, 570 boul. St-Jean, Pointe-Claire, QC, Canada" |
| ISSN/ISBN: | 0273-1223 (Print) 0273-1223 (Linking) |
| Abstract: | "In activated sludge (AS) biotreatment, septic compounds such as volatile organic acids and reduced sulphur compounds have been frequently cited as a major cause of Thiothrix and Type 021N filamentous bulking. These filaments are common in Canadian pulp and paper biotreatment systems, where they cause settling problems in secondary clarifiers. We conducted a 14-week study of a TMP/newsprint mill effluent to characterize the septic compounds entering the biotreatment, and to determine correlations with AS biomass characteristics and biotreatment operating parameters. A significant correlation was found between the sludge volume index, the abundance of Type 021N, and the propionic acid (PA) concentration in the primary clarified effluent. PA also induced a significant change in the flocculating bacteria size distribution determined by digital imaging. Consequently, the correlation observed between PA and Type 021N bulking is an indirect effect of inhibition of floc-forming microorganisms, giving a competitive advantage to filaments" |
| Keywords: | Biomass Bioreactors/microbiology *Industrial Waste Organic Chemicals/chemistry Paper Propionates/chemistry Sewage/*microbiology Sulfur Compounds/chemistry Thiotrichaceae/classification/*growth & development/metabolism Time Factors Volatilization Waste Dis; |
| Notes: | "MedlinePelletier, Carl Fitzsimmons, Mary Ann Deschenes, Sophie Paice, Michael eng Research Support, Non-U.S. Gov't England 2007/05/10 Water Sci Technol. 2007; 55(6):135-42. doi: 10.2166/wst.2007.221" |
