title: Utilization of wasted sardine oil as co-substrate with pig slurry for biogas production--a pilot experience of decentralized industrial organic waste management in a Portuguese pig farm.
abstract: This work aimed to demonstrate in a pig farm and in real conditions, the possibilities to co-digest wasted sardine oil (WSO) and pig slurry (PS) at farm scale. A biogas mobile pilot plant, was set up in the farm and operated in real conditions during 4 months. Dynamic mesophilic (35-37 °C) continuous pilot trials were performed during four different periods of time. In each period a different organic loading rate (OLR) based on the chemical oxygen demand (COD) was operated sequentially, with pig slurry (PS) (OLR = 1.6 kg COD/m(3) d(-1)) and with mixtures of WSO:PS with a volumetric composition (% v/v) of 2:98 (OLR = 3.0 kg COD/m(3) d(-1)), 3:97 (OLR = 3.7 kg COD/m(3) d(-1)) and 5:95 (OLR = 5.2 kg COD/m(3) d(-1)). Biomass adapted very fast in metabolise the WSO and biogas productivity was raised substantially for different compositions of WSO:PS. Process stability indicators pH and Total volatile fatty acids/bicarbonate alkalinity (T-VFA/BA) ratio, suggests that the co-digestion process was robust. It was concluded that WSO could be easily co-digested in farm scale biogas plants.
authors.affiliation: Department of Agricultural and Environmental Chemistry, Superior Institute of Agronomy, TU Lisbon, Tapada da Ajuda, 1349-017 Lisboa, Portugal.
authors.forename: L
authors.initials: L
authors.lastname: Ferreira
authors.forename: E
authors.initials: E
authors.lastname: Duarte
authors.forename: D
authors.initials: D
authors.lastname: Figueiredo
mesh_terms: D000822:Animal Husbandry; D000818:Animals; D001673:Biodegradation, Environmental; D056804:Biofuels / Q000032:analysis*; D005395:Fish Oils / Q000737:chemistry*; D005399:Fishes; D007220:Industrial Waste / Q000032:analysis*; D008697:Methane / Q000032:analysis; D010865:Pilot Projects; D011174:Portugal; D012722:Sewage / Q000737:chemistry*; D034421:Sus scrofa; D013997:Time Factors; D018505:Waste Management / Q000295:instrumentation / Q000379:methods*; D014866:Waste Products / Q000032:analysis*
chemical_list: D056804:Biofuels; D005395:Fish Oils; D007220:Industrial Waste; D012722:Sewage; D014866:Waste Products; D008697:Methane