Title: Thickening of sludges in a wastewater treatment plant with a hydrocyclone
Authors: Fritsch, Lukas 
Senfter, Thomas 
Berger, Manuel 
Kofler, Tobias 
Holzer, Sandro 
Mayerl, Christian 
Pillei, Martin 
Kraxner, Michael 
Keywords: hydrocyclone; thickening; sewage sludge; wastewater treatment
Issue Date: Dec-2020
Book Title: Proceedings of the 16th Minisymposium Verfahrenstechnik and 7th Partikelforum (TU Wien, Sept. 21/22, 2020) 
This paper describes the production of sewage sludge and the need for dewatering. Since drying is an energy-intensive process, mechanical dewatering prior to drying can minimize the energy needed to reduce the water content respectively total volume of sludge.  The limit for mechanical dewatering, the so called bound-water content, is explained. Different thickening/dewatering devices are described. Some of these devices require the sludge to be chemically conditioned with polymers or other conditioners. In order to reduce the amount of conditioners needed, hydrocyclones for dewatering are examined.  Hydrocyclones are not state of the art in the area of dewatering, but some existing literature confirms the possibility to dewater sludge with a hydrocyclone. The hydrocyclone's operation mode for this process is different than for the classification process. First tests in small-scale with water and Carolith particles showed that thickening is possible with a hydrocyclone. The particle concentration in the thickened flow can be adjusted with a mechanical device. This device is used to adjust the area for the hydrocyclone's underflow. For large-scale experiments, primary sludge and sewage sludge, with and without added polymer, are used to test the thickening ability of a hydrocyclone in a wastewater treatment plant. The experiments show that thickening in terms of increasing the dry matter content of sludge is possible with a hydrocyclone. Hence a hydrocyclone is a possible alternative to common thickening devices or could be used as a pre-dewatering device.
URI: http://hdl.handle.net/20.500.12708/16667
DOI: 10.34726/610
Organisation: E166-02-2 - Forschungsgruppe Fluiddynamische Simulation (CFD) 
License: CC BY 4.0 CC BY 4.0
Publication Type: Inproceedings
Appears in Collections:Conference Paper

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