Abstract: A tool assembly for a comminuting apparatus having knives secured to the periphery of a comminuting rotor is provided including an integral knife carrier adapted to be secured to the comminuting rotor of the comminuting apparatus having a supporting surface for support against a seat formed at the rotor and an abutment face with a non-threaded through bore extending therefrom. The assembly includes a knife detachably secured to the knife carrier, a screw connection between the knife and knife carrier, and a screw bolt extending through the through bores of the knife and the knife carrier, wherein a screw nut is screwed onto a portion of the screw bolt extending beyond a trough bore of the knife carrier for clamping the knife to the knife carrier.

Abstract: In a sealed container, organic material, more especially biowaste is composted. The exhaust air from the sealed container is purified in an exhaust air cleaning unit. In order to improve the cleaning effect, the condensate water from the exhaust air cleaning unit is supplied to a high performance bioreactor, in which it is brought into contact with atmospheric oxygen and is agitated. The suspension leaving from the bioreactor is caused to flow in a circuit through an ultra-filtration module for purifying the water.