title: Biohydrogen and biomethane production sustained by untreated matrices and alternative application of compost waste.
abstract: Biohydrogen and biomethane production offers many advantages for environmental protection over the fossil fuels or the existing physical-chemical methods for hydrogen and methane synthesis. The aim of this study is focused on the exploitation of several samples from the composting process: (1) a mixture of waste vegetable materials ("Mix"); (2) an unmatured compost sample (ACV15); and (3) three types of green compost with different properties and soil improver quality (ACV1, ACV2 and ACV3). These samples were tested for biohydrogen and biomethane production, thus obtaining second generation biofuels and resulting in a novel possibility to manage renewable waste biomasses. The ability of these substrates as original feed during dark fermentation was assayed anaerobically in batch, in glass bottles, in order to determine the optimal operating conditions for hydrogen and/or methane production using "Mix" or ACV1, ACV2 or ACV3 green compost and a limited amount of water. Hydrogen could be produced with a fast kinetic in the range 0.02-2.45mLH2g(-1)VS, while methane was produced with a slower kinetic in the range 0.5-8mLCH4g(-1)VS. It was observed that the composition of each sample influenced significantly the gas production. It was also observed that the addition of different water amounts play a crucial role in the development of hydrogen or methane. This parameter can be used to push towards the alternative production of one or another gas. Hydrogen and methane production was detected spontaneously from these matrices, without additional sources of nutrients or any pre-treatment, suggesting that they can be used as an additional inoculum or feed into single or two-stage plants. This might allow the use of compost with low quality as soil improver for alternative and further applications.
authors.affiliation: Department of Life Sciences and Systems Biology, University of Torino, Torino 10133, Italy.
authors.forename: Mariaconcetta
authors.initials: M
authors.lastname: Arizzi
authors.affiliation: Department of Life Sciences and Systems Biology, University of Torino, Torino 10133, Italy.
authors.forename: Simone
authors.initials: S
authors.lastname: Morra
authors.affiliation: Centre of Competence for Innovation in Agro-Environmental Field, Agroinnova, University of Torino, Largo Paolo Braccini 2, 10095 Grugliasco (TO), Italy; Agri New Tech srl, Via G. Quarello 15/A, Torino, Italy.
authors.forename: Massimo
authors.initials: M
authors.lastname: Pugliese
authors.affiliation: Centre of Competence for Innovation in Agro-Environmental Field, Agroinnova, University of Torino, Largo Paolo Braccini 2, 10095 Grugliasco (TO), Italy; Agri New Tech srl, Via G. Quarello 15/A, Torino, Italy.
authors.forename: Maria Lodovica
authors.initials: ML
authors.lastname: Gullino
authors.affiliation: Department of Life Sciences and Systems Biology, University of Torino, Torino 10133, Italy.
authors.forename: Gianfranco
authors.initials: G
authors.lastname: Gilardi
authors.affiliation: Department of Life Sciences and Systems Biology, University of Torino, Torino 10133, Italy. Electronic address: francesca.valetti@unito.it.
authors.forename: Francesca
authors.initials: F
authors.lastname: Valetti
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels / Q000032:analysis*; D005285:Fermentation; D005735:Garbage; D006859:Hydrogen / Q000032:analysis*; D008697:Methane / Q000032:analysis*; D012987:Soil / Q000737:chemistry; D062611:Solid Waste / Q000009:adverse effects; D018505:Waste Management / Q000379:methods*
chemical_list: D056804:Biofuels; D012987:Soil; D062611:Solid Waste; D006859:Hydrogen; D008697:Methane
keywords: Anaerobic digestion; Bioenergy; Clean fuels; Compost; Waste