Abstract
In this paper we present a novel design of a gasification plant suitable for utilizing difficult waste biomass and producing heat. The plant was designed to be installed in biomass processing factories where it could successfully replace existing boilers and produce technological steam, while processing the biomass waste resulting from factory main production process. We present in details two such plants, which process feathers or tanned leather waste, and analyses the properties of bottom ash resulting from the gasification process. The bottom ash obtained from gasification of tanned leather waste contains chromium oxide, whereas the one obtained from feathers is rich in phosphor and these components can be easily recovered and reused, closing one loop in circular economy. The study proved that gasification allows for effective conversion of energy and in some cases are clearly advantageous over incinerations producing ashes safer and easier to handle.
