Solid anaerobic digestion batch of bio-waste as pre-treatment for improving amendment quality: The effect of inoculum recirculation.
The effect of solid anaerobic digestion batch (SADB) on bio-waste performed with and without inoculum on the quality of the final amendment was investigated by means of determining the content of organic carbon, humic and fulvic acids and the degree of humification. Two different processes were compared: composting and SADB with post-composting. Six parallel tests were performed. In three of these tests the SADB was inoculated mixing the bio-waste with the digestate from the previous run in a 1:1 ratio by weight. The amendment obtained by the SADB with post-composting treatment, in which the SADB was not inoculated, had an organic carbon content ranging from 15.5% TS to 30.3% TS resulting from 1% up to 14% higher than that of the corresponding composting processes. Similar results were achieved for the degree of humification. On the other hand SADB in which the inoculum was used generated about 300NL/kgVS of biogas instead of about 267NL/kgVS for non-inoculated runs.
LAR Laboratory, Dipartimento di Ingegneria, Via G. Duranti 93, 06125 Perugia, Italy; CIMIS, Via G. Duranti 67, 06125 Perugia, Italy. Electronic address: francesco.dimaria@unipg.it.
Francesco
F
Di Maria
LAR Laboratory, Dipartimento di Ingegneria, Via G. Duranti 93, 06125 Perugia, Italy.
Enrico
E
Segoloni
Dipartimento di Ingegneria Civile ed Ambientale, Via G. Duranti 93, 06125 Perugia, Italy.
Daniela
D
Pezzolla
D001578:Benzopyrans / Q000032:analysis; D056804:Biofuels / Q000032:analysis*; D019149:Bioreactors; D002244:Carbon / Q000032:analysis*; D006812:Humic Substances / Q000032:analysis*; D012037:Refuse Disposal; D018505:Waste Management / Q000379:methods*
D001578:Benzopyrans; D056804:Biofuels; D006812:Humic Substances; D002244:Carbon; C005023:fulvic acid
Composting; Degree of humification; Humic and fulvic acids; Integrated anaerobic/aerobic treatment; Organic waste; Solid anaerobic digestion batch