Abstract: Solids removal assemblies (14) adapted for use in flow-through or batch-type sedimentation tanks (12) are provided which increase the efficiency of solids removal and eliminate physical scraping devices common with such sedimentation tanks. The preferred removal assemblies (14) include an elongated hood (34) disposed over a cooperating and complementally configured fill structure (26,28), which fills the majority of the internal volume of the hood (34). The hood (34) includes converging sidewalls (44, 46) having lower most inlet openings (54) and spaced, tubular outlets (56) adjacent the apex thereof. Outlet pipes (64) are operably coupled with each of the hood outlets (56) for suction withdrawal of waste water-solids suspensions which are then conveyed for downstream processing.

Abstract: A waste treatment module (10) designed for placement within an aeration basin (12) is provided which performs all of the desirable functions of aeration, flocculation, sedimentation, sludge return, effluent collection and skimming. the module (10) includes walls (20) defining an upright chamber (22); the latter is provided with a pair of side marginal, slotted inlets (28, 30) with corresponding flocculators (24, 26) below the respective inlets (28, 30). Each flocculator (24, 26) is equipped with a plurality of vertically spaced baffle plates (86, 88, 90) having offset openings (92, 94, 96, 98) so as to cause solids within the wastewater to traverse a tortuous descending flow path which promotes flocculation. An agglomerated flocculent is collected within a lower sedimentation zone (34) and then passes into a central collector (108) of inverted V-shaped configuration.