Fig. 3From: Resource recovery and waste-to-energy from wastewater sludge via thermochemical conversion technologies in support of circular economy: a comprehensive reviewMoisture content of feed in the reactor for various experimental papers reviewed. While technologies such as pyrolysis and gasification require considerable drying of the feed before the reactions, the hydrothermal technologies can work with moisture contents in the range of 70–95 wt%Back to article page