Pilot plant studies with settled domestic waste water were carried out to study the influence of a contact tank on bulking sludge control. It has been clearly proved that the configuration of the contact tank plays a decisive role in preventing or curing bulking sludge. A rectangular contact tank with a substrate gradient ensured well-settling sludge, while a circular contact tank - completely mixed - was not able to control bulking sludge. Stirring or aerating of the rectangular contact tank did not make a difference in the sludge quality during continuous process operation. Great differences in biosorption and COD-removal were measured between well-settling and poor-settling sludge. A detention time of 30 minutes of the sludge-water mixture in the rectangular tank guaranteed - on the basis of biosorption and COD-removal - a more stable and reliable process for controlling bulking sludge than 10 minutes.
The Effect of Contact Tank Operation on Bulking Sludge and Biosorption Processes
J. H. Rensink, H. J. G. W. Donker; The Effect of Contact Tank Operation on Bulking Sludge and Biosorption Processes. Water Sci Technol 1 February 1991; 23 (4-6): 857–866. doi: https://doi.org/10.2166/wst.1991.0537
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