High solids anaerobic digestion of pfmsw using novel anaerobic reactors
In the last decade efforts have been made to control anaerobic digestion of the putrescible fraction of municipal solid waste (PFMSW) in engineered reactors, than to allow for 'free' digestion in landfill sites. Such a process achieves enhanced treatment efficiency in significantly reduced retention times (from years down to days) and completes energy recovery from waste, without biogas emissions that cause adverse greenhouse effects. Three approaches are used for anaerobic treatment of MSW, namely: conventional 'low solids' slurry digestion, dry 'high solids' digestion and two-phase digestion. The results in this paper are part of a 3-year laboratory project in the laboratory of Environmental Engineering in the University of Newcastle upon Tyne, on 'high solids' anaerobic digestion of PFMSW. In this paper parts of this project related to the development of the Horizontal Rotary Reactor (HRR) and the Vertical Sequential Reactor (VSR) are presented.