An experimental apparatus was constructed to perform Hybrid Solid Anaerobic Digestion Batch of the organic fraction of municipal solid waste. The preliminary process was carried out with a high Total Solids concentration of about 33% ww-1 and with an initial Organic Load of about 340 kgVSkg-1. The Fresh organic fraction to Inoculum ratio used to enhance the anaerobic process start-up was 0.910 kgVSkgVS-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 3,000 to 11,000 mgL-1. In spite of these high concentrations, the biomethane produced from both the solid and the percolate was quite high, about 210 NLkgVS-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%.
Hybrid solid anaerobic digestion batch: Biomethane production and mass recovery from the organic fraction of solid waste
DI MARIA, Francesco;GIGLIOTTI, Giovanni;MICALE, CATERINA;ZADRA, Claudia;MASSACCESI, LUISA
2013
Abstract
An experimental apparatus was constructed to perform Hybrid Solid Anaerobic Digestion Batch of the organic fraction of municipal solid waste. The preliminary process was carried out with a high Total Solids concentration of about 33% ww-1 and with an initial Organic Load of about 340 kgVSkg-1. The Fresh organic fraction to Inoculum ratio used to enhance the anaerobic process start-up was 0.910 kgVSkgVS-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 3,000 to 11,000 mgL-1. In spite of these high concentrations, the biomethane produced from both the solid and the percolate was quite high, about 210 NLkgVS-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%.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
