In a method for aerating compost by forcing air upwards through the mass of compost, the air forced through the compost is formed alternately or cyclically by air of different physical or chemical properties and/or by air fed in at geometrically different sites. An independent claim is included for apparatus for the process, comprising first aeration elements, between which second aeration elements are inserted (in series or in an arc), where the first and second elements are alternately connected to crude air sources via switching or reversing valves.
