title: Hybrid solid anaerobic digestion batch: biomethane production and mass recovery from the organic fraction of solid waste.
abstract: An experimental apparatus was constructed to perform hybrid solid anaerobic digestion batch processing of the organic fraction of municipal solid waste. The preliminary process was carried out with a high total solids concentration of about 33% w w(-1) and with an initial organic load of about 340 kg VS kg(-1). The fresh organic fraction to inoculum ratio used to enhance the anaerobic process start-up was 0.910 kg VS kg VS(-1). The process was conducted by spreading the percolate on top of the mixture. The percolate was stored in a separate section of the apparatus with a mean hydraulic retention time of about 1 day. During the process, acetate, butyrate and propionate in the percolate reached concentrations ranging from 3000 to 11 000 mg L(-1). In spite of these high concentrations, the biomethane produced from both the solid and the percolate was quite high, at about 210 NL kg VS(-1). The digestate obtained at the end of the run showed rather good features for being classified as an organic fertilizer according to Italian law. However, a residual phytotoxicity level was detected by a standardized test showing a germination index of about 50%.
authors: Dipartimento di Ingegneria Industriale, University of Perugia, Perugia, Italy. fdm@unipg.it
authors: Francesco
authors: F
authors: Di Maria
authors: Giovanni
authors: G
authors: Gigliotti
authors: Alessio
authors: A
authors: Sordi
authors: Caterina
authors: C
authors: Micale
authors: Claudia
authors: C
authors: Zadra
authors: Luisa
authors: L
authors: Massaccesi
mesh_terms: D000693:Anaerobiosis; D008697:Methane / Q000378:metabolism*; D012037:Refuse Disposal
chemical_list: D008697:Methane
keywords: Biomethane; germination index; hybrid solid anaerobic digestion batch; organic load; volatile fatty acids