Abstract: A dispersion of air or oxygen in liquid sewage and/or or sludge is admitted tangentially into the lower portion of an upright vessel wherein the dispersion rises and is compelled to flow through eccentric flow restricting passages in several superimposed horizontal partitions so that the dispersion is repeatedly induced to form a turbulent helical flow. The rising dispersion flows around a tube which returns a portion of the dispersion into the lower part of the vessel and causes the remaining portion to overflow into a receptacle having an outlet at a level below the open top of the tube. The dispersion which descends in the tube is readmitted tangentially into one or more chambers which are separated from each other by the partitions in the vessel and communicate with each other by way of the respective flow restricting passages.

Abstract: A process for the treatment of organic fall-out products with separation of noxious matter, in particular heavy metals, wherein the organic fall-out products are submitted to an aerobic pretreatment, subsequently to a treatment for disintegrating the cells and wherein the valuable and noxious substances contained in said cells, laid bare by said disintegrating treatment, are separated and the noxious matter eliminated, and the thus obtained solution, free from noxious matter, is submitted to a treatment for recovering the valuable substances contained therein, in particular proteins to be used as forage or fertilizers or the like.This is an economic process for obtaining superior substances, in particular proteins, which are free from noxious matter such as heavy metals, from organic fall-out products such as sewage water or sludge.