Abstract: A process for treating smoke, aqueous sewage and solid waste/refuse materials by digesting all three waste material into an odor-free pumpable slurry. The slurry is screened to separate solids from the aqueous solution. The odor-free solids may be used as fertilizers and the odor free solution may be used for irrigational purposes.

Abstract: A multi-purpose heavy duty centrifugal mill including a vertically disposed housing to which various frangible materials are fed tangentially to a pre-grinder located in the bore of the housing with the pre-grinder adapted to grind the materials to a predetermined size and direct them to comminution devices for further gradation sizing. The housing is open at the top to freely admit air for aeration of putricidable materials and through which a liquid carrier medium may be introduced.

Abstract: Organic materials are fed tangentially into the head of a centrifugal mill by an adjustable rate feeding device. The materials, either in a dry state or in conjunction with a separately supplied liquid carrier, move downwardly through a compacter device which positively feeds the materials through a series of comminution devices which are arranged in an inverted conical housing and are of decreasingly smaller sizes, with the comminution means shredding the materials. The top of the mill is open to freely admit air which is admixed by the communition devices with the materials to satisfy the biochemical oxygen demand so that the output product of the mill is odor free and finely shredded.

Abstract: A system including an evacuator apparatus, an especially configured centrifugal mill, and a self cleaning screen is employed for treatment of aqueous sewage. The system expedites satisfaction of the biochemical oxygen demand and separates the solids from the sewage so that the treated water is suitable for uses such as irrigation, equipment cooling and the like, and the separated solids are suitable for use in fertilizers.

Abstract: A centrifugal mill for treating refuse is fed so that the refuse comes into contact with a pre-breaker mechanism and subsequently into contact with a series of comminution mechanisms. Feeding of the refuse is simultaneously accomplished with the injection of a fluid carrier medium such as air, water, aqueous sewage, and the like which is blended with the refuse. The mill is provided with mechanisms for adjustably controlling the through-put rate of the refuse and the fluid carrier medium.