The decanter’s hour has come as soon as the solids content in the suspension to be processed is particularly high. These machines provide the benefits of high clarifying efficiency and maximum dewatering as well as the separation of liquids with the simultaneous removal of solids. The main requirements in this respect include a high bowl speed, a powerful drive for the scroll and a scroll speed which automatically adapts to the solids loading in the feed.Due to its versatility and the technological know-how of GEA, the decanter can be used for a wide range of process tasks; from clarification through separation, classification, concentration and washing right up to extraction.
Clarifying decanters are used to separate solids out of a suspension to obtain a virtually solids-free, clarified liquid. Dewatering decanters ensure maximum concentration of the solids to get them as dry as possible. Separating decanters separate two chemically immiscible liquids with simultaneous separation of the solids. Classifying decanters split the solids mixture of the suspension into a fine (small particles) and a coarse (large particles) fraction. Extraction decanters mix a liquid containing a solid or extract with a liquid agent which contains the solids or liquid after mixing. Finally, there is the possibility of integrating a co-current, counter-current or dilution washing system in the decanter for washing the suspended solids.
3-Phase Separating Decanter
The 3-Phase Separating Decanter is a centrifuge in which two liquids of different densities are separated from each other. At the same time solids are separated and discharged.
Clarifying decanters are designed for the continuous separation of suspensions into solids and clarified liquid, without interrupting the feed of the suspension.
Dewatering Decanters from GEA are continuously operating horizontal solid-wall bowl centrifuges for maximum dewatering requirements of municipal and industrial wastewater sludge. The frame is of open design with either gravity or pressure discharge of the clarified phase.
Thickening Decanters from GEA are continuously operating horizontal solid-wall bowl centrifuges for thickening of sewage sludge, e.g. surplus activated sludge, in order to achieve an economic volume reduction in times of increasing quantities of sewage sludge. The clarified liquid is gravity-discharged into a catcher and flows off pressureless.