Abstract: An aerobic digestor for rapidly and efficiently composting waste vegetation and the like has a rotatable drum mounted on a horizontal transverse axis at the midpoint of the length on a frame spacing it above the ground a distance sufficient for rotation; a fixed end of the drum mounts a perforate tube coaxially in the drum between the ends and holes in the fixed end and the removable end of the drum admit air for composting to the perforate tube through adjustable shutters; material being composted in the drum receives air through the tube perforations and may be end-for-ended periodically with the drum at which time the shutter on the end being lowered may be closed to force air up through the dropping charge of waste material.

Abstract: Continuous reaction with immobilized enzyme beads is carried out in an enzymatic reactor providing for continuous reaction accompanied by continuous cleansing of the immobilized enzyme beads and continuous recycling of the cleansed-immobilized enzyme beads for reaction. The reactor comprises a reaction chamber having a screw mounted coaxially within a shell having first and second ends, means at the first end for introducing immobilized enzyme beads and fluid reactant material, means at the second end for removal of product, means at the second end for lifting of immobilized enzyme beads and dropping them through a reaction chamber and means for conveying cleansed immobilized enzyme beads from the cleansing chamber to the means for introducing.

Abstract: An improved anaerobic digestor system for producing methane gas from waste biomass includes closed provisions for continuously feeding the biomass for system digestion, for continuously advancing and stirring the biomass while in the system through a continuum of stages, for continuously collecting gases produced and for continuously expelling spent biomass from the system for use as fertilizer; a second embodiment provides a longer path in a plurality of parallel short length troughs cast in one piece, each trough of which has a corresponding plurality of hemi-cylindrical covers and of end pieces with "U" shaped connections between ends of the tanks so-formed.