Flotation Units, type WWL

The WWL flotation units are robustly built and characterised by large "free surface" areas. For wastewater containing large solids contents, the design provides sufficient retention time for separation and pre-dewatering of the skimming.

The WWL units have been designed for wastewater with COD contents of 10 000 mg/l and higher. In the same system, suspended solids, fat, oil, grease and other dispersed and/or flocculated materials are removed, as well as settled materials.

Typical WWL features are the very efficient micro aeration system and a stainless steel sediment transport auger operating over the entire base of the flotation system.

The complete design of the WWL systems is based on elimination of hydraulic disturbances, resulting in a complete stable and laminar flow at all cross sections of the system. Depending on the application, specially with respect to the solids amount to be removed, either a special multistage gas/liquid pump or a pressure vessel type saturation unit is applied to generate a supersaturated water/air (gas) mixture.


  • automatic clog-free aeration system (patent pending);
  • multi stage gas / liquid pump or pressure vessel saturation unit;
  • separation enhancing lamella module;
  • construction materials other than standard AISI 304;
  • stainless steel AISI 304 hinged cover.