title: Effect of aerobic pre-treatment on hydrogen and methane production in a two-stage anaerobic digestion process using food waste with different compositions.
abstract: Aerobic pre-treatment was applied prior to two-stage anaerobic digestion process. Three different food wastes samples, namely carbohydrate rich, protein rich and lipid rich, were prepared as substrates. Effect of aerobic pre-treatment on hydrogen and methane production was studied. Pre-aeration of substrates showed no positive impact on hydrogen production in the first stage. All three categories of pre-aerated food wastes produced less hydrogen compared to samples without pre-aeration. In the second stage, methane production increased for aerated protein rich and carbohydrate rich samples. In addition, the lag phase for carbohydrate rich substrate was shorter for aerated samples. Aerated protein rich substrate yielded the best results among substrates for methane production, with a cumulative production of approximately 351ml/gVS. With regard to non-aerated substrates, lipid rich was the best substrate for CH4production (263ml/gVS). Pre-aerated P substrate was the best in terms of total energy generation which amounted to 9.64kJ/gVS. This study revealed aerobic pre-treatment to be a promising option for use in achieving enhanced substrate conversion efficiencies and CH4production in a two-stage AD process, particularly when the substrate contains high amounts of proteins.
authors: Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy. Electronic address: razieh.rafieenia@phd.unipd.it.
authors: Razieh
authors: R
authors: Rafieenia
authors: Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
authors: Francesca
authors: F
authors: Girotto
authors: Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
authors: Wei
authors: W
authors: Peng
authors: Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
authors: Raffaello
authors: R
authors: Cossu
authors: Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
authors: Alberto
authors: A
authors: Pivato
authors: Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
authors: Roberto
authors: R
authors: Raga
authors: Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
authors: Maria Cristina
authors: MC
authors: Lavagnolo
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002241:Carbohydrates / Q000737:chemistry; D005232:Fatty Acids, Volatile / Q000737:chemistry; D005502:Food; D019649:Food Industry; D006859:Hydrogen / Q000737:chemistry / Q000378:metabolism*; D006868:Hydrolysis; D007220:Industrial Waste; D008055:Lipids / Q000737:chemistry; D008697:Methane / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage / Q000737:chemistry*
chemical_list: D002241:Carbohydrates; D005232:Fatty Acids, Volatile; D007220:Industrial Waste; D008055:Lipids; D012722:Sewage; D006859:Hydrogen; D008697:Methane
keywords: Aerobic pre-treatment; Anaerobic digestion; Food waste; Hydrogen; Methane