title: Biohydrogen from thermophilic co-fermentation of swine manure with fruit and vegetable waste: maximizing stable production without pH control.
abstract: Hydrogen production by dark fermentation may suffer of inhibition or instability due to pH deviations from optimality. The co-fermentation of promptly degradable feedstock with alkali-rich materials, such as livestock wastes, may represent a feasible and easy to implement approach to avoid external adjustments of pH. Experiments were designed to investigate the effect of the mixing ratio of fruit-vegetable waste with swine manure with the aim of maximizing biohydrogen production while obtaining process stability through the endogenous alkalinity of manure. Fruit-vegetable/swine manure ratio of 35/65 and HRT of 2d resulted to give the highest production rate of 3.27 ± 0.51 L(H2)L(-1)d(-1), with a corresponding hydrogen yield of 126 ± 22 mL(H2)g(-1)(VS-added) and H2 content in the biogas of 42 ± 5%. At these operating conditions the process exhibited also one of the highest measured stability, with daily productions deviating for less than 14% from the average.
authors.affiliation: Department of Agricultural Engineering, Università degli Studi di Milano, Via Celoria 2, 20133 Milano, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Tenca
authors.forename: A
authors.initials: A
authors.lastname: Schievano
authors.forename: F
authors.initials: F
authors.lastname: Perazzolo
authors.forename: F
authors.initials: F
authors.lastname: Adani
authors.forename: R
authors.initials: R
authors.lastname: Oberti
mesh_terms: D000818:Animals; D056804:Biofuels / Q000032:analysis*; D005285:Fermentation / Q000502:physiology*; D005638:Fruit / Q000737:chemistry*; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008372:Manure / Q000032:analysis*; D013499:Surface Properties; D034421:Sus scrofa; D013696:Temperature; D013997:Time Factors; D014675:Vegetables / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D014866:Waste Products / Q000032:analysis
chemical_list: D056804:Biofuels; D008372:Manure; D014866:Waste Products; D006859:Hydrogen