Arrangement for the flocculation of flocculatable substances in suspensions, particularly for the purification of the backwater of deinking installations for waste paper processing

An arrangement for the flocculation of flocculatable substances in suspension, particularly for the purification of backwater of deinking installations for waste paper processing, comprising:

• a reservoir for the delivery of a suspension;
• a container having a bottom;
• conduit means for supplying the suspension from the reservoir to the container in a predeterminate direction of movement;
• means for supplying chemical agents to the suspension in a quantity adequate for flocculation of the suspension;
• means for supplying air to the suspension;
• said means for supplying chemical agents and said means for supplying air being arranged upstream of the container with respect to said predeterminate direction of movement of the suspension;
• rotatable rotor means arranged within said container;
• a shaft defining a substantially vertical axis of rotation provided for said rotatable rotor means;
• said rottable rotor means arranged within said container rotating about said substantially vertical axis of rotation defined by said shaft;
• said rotatable rotor means comprising at least two arm members;
• each of said arm members extending substantially horizontally and radially outwardly from said shaft;
• said shaft being structured to supply the suspension admixed with the chemical agents and air to one of said arm members for infeeding the suspension admixed with the chemical agents and air into the container;
• said one arm member being situated below a liquid surface of the suspension within the container;
• said other arm member removing from the container liquid substantially freed from floating flocculated substances of the suspension by means of said shaft;
• said shaft defining means for supplying the suspension admixed with the chemical agents and air to said one arm member and for the outfeed of the liquid substantially freed from floating flocculated substances by said other arm member;
• said other arm emmber being arranged above the bottom of the container;
• said two arm members being arranged at different heights in said container such that said one arm member for supplying the suspension is positioned at a higher location than the other arm member for removing the liquid substantially freed from floating flocculated substances of the suspension and constituting clarified water;
• each of said arm members having a free end and a predeterminate length between the shaft and the free end of each such arm member;
• each of said arm members being provided with openings along the predetermined length of the arm members;
• the two arm members being located at an acute angle with respect to one another;
• said one arm member defining an upper arm member and said other arm member defining a lower arm member;
• said upper arm memberfor infeeding the suspension, during rotation of the rotatable rotor means, trailing the lower arm member for removing the clarified water;
• at least one measuring device for measuring a predeterminate characteristic of the flocculated substances in the container;
• a removal conduit located substantially centrally of said shaft for removal of flotation scum formed by the floating flocculated substances;
• conveying means for conveying the flotation scum to the substantially centrally located removal conduit;
• an additional radially directed arm member provided for said rotatable rotor means;
• said conveying means comprising a conveyor device arranged at said additional radially directed arm member;
• a radially directed trough;
• said conveyor device being arranged in said radially directed trough;
• an impeller wheel disposed substantially parallel to the conveyor device;
• and
• said impeller wheel including blade means for conveying the flotation scum into the trough for removal by the conveyor device and infeed thereof to the centrally located removal circuit.