In order to save operating costs for sludge treatment it is necessary to thicken the surplus sludge as far as possible. That is the reason why at the Emscher mouth treatment plant one existing circular thickener has been converted to a flotation plant. The experience gained so far shows good results of the achieved dry solids concentration but also a lot of technical problems.
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W. Preiss; Thickening of Surplus Sludge by Means of Flotation. Water Sci Technol 1 April 1988; 20 (4-5): 217–222. doi: https://doi.org/10.2166/wst.1988.0169
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