Abstract: The present invention relates to a method for treating vegetable, fruit and garden waste, comprising the steps of: a) fermenting vegetable, fruit and garden waste, b) mixing the at least partially fermented waste from step a) with compost, c) composting the thus obtained mixture to obtain compost, wherein the percentage dry matter by weight of the mixture obtained in step b) is at least 35. Furthermore, the present invention relates to a method of providing a greenhouse with carbon dioxide and/or heat. Also, the present invention relates to a method of composting fermented vegetable, fruit and garden waste. The present invention furthermore relates to a waste treatment facility for the treatment of vegetable, fruit and garden waste.

Abstract: A plug-flow operated, horizontal fermenter for anaerobic fermentation of biogenic waste includes a fermenter tank having an inlet and an outlet that is configured to be filled with a biomass material. The fermenter also includes an agitator having a shaft passing through the fermenter tank in its longitudinal direction, wherein the shaft is mounted in end regions of the fermenter tank and is designed as a closed, hollow shaft having an inner space filled with gas or air. A plurality of agitator arms are arranged on the shaft. The inner space of the shaft is monitored with respect to a gas or air pressure to ensure that a buoyancy of the shaft in the filled fermenter tank at least approximately compensates for a sagging of the shaft.