Co-digestion of cow manure, food waste and intermittent input of fat.
Pulses of oil were added to completely mixed reactors fed with dairy cow manure and food waste, after achieving a stable performance at an organic loading rate of 4.6+/-0.1gCOD/(l(reactor) day), an oily waste effluent from a canned fish processing industry was fed in the form of pulses. The oil concentration rose up to 9, 12, 15 and 18gCOD(oil)/l(reactor,) after the pulse feeding in the reactor. The highest fat concentration of 18gCOD(oil)/l(reactor) promoted a persistent inhibition in the process of the continuous reactor, although in batch assays, the reactor content evidenced a capacity to degrade more oil and to degrade the accumulated organic matter. All the other pulses had a positive effect in the methane production. From a practical point of view, this work demonstrates that controlled intermittent inputs of oil can enhance the methane production in a co-digestion of cow manure and food waste.
Neves
L
L
IBB-Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
Oliveira
R
R
Alves
M M
MM
D000818:Animals; D018533:Biomass; D019149:Bioreactors; D002417:Cattle; D005502:Food; D008372:Manure; D008697:Methane; D009821:Oils; D018505:Waste Management
D008372:Manure; D009821:Oils; D008697:Methane