up agglomerated solids as a consequence of the above the rate of sedimentation in compartment 7 is improved because the settling solids transferred thereto have only downward velocity and momentum while settling likewise the possibility of disturbing solids that have settled out in compartment 7 with high input momentum of flowing currents fed into port 38 are eliminated by confining it to compartment 3 similarly the rate of concentration of accumulated sludge is also improved the reason for this is that the possibility of disturbing accumulated solids with the input momentum of entering influent is eliminated or at least significantly minimized to continue as the influent flows into compartment 7 solids acted on by forces of gravity are induced to settle and accumulate at the bottom base area 23 of compartment 7 a greater efficiency of solids separation is achieved in this process because of separating the mixing and settling compartments 3 and 7 respectively and thereby reducing forces that may disturb sedimentation after a desired amount of settled sludge is collected in base area 23 it is removed at exit port 25 when sludge collector 35 and non annular blade shaped scraper plow 37 employed plow 37 removes or directs settled sludge to collector 35 interior.