Addition of an oily waste to a co-composting process
of dairy cow manure with food waste, and the influence in the final
product was evaluated. Three static composting piles with different
substrates concentrations were assessed. Sawdust was also added to
all composting piles to attain 60%, humidity at the beginning of the
process. In pile 1, the co-substrates were the solid-phase of dairy
cow manure, food waste and sawdust as bulking agent. In piles 2 and
3 there was an extra input of oily waste of 7 and 11% of the total
volume, respectively, corresponding to 18 and 28% in dry weight.
The results showed that the co-composting process was feasible even
at the highest fat content. Another positive effect due to the oily
waste addition was the requirement of extra humidity, due to the
hydrophobic properties of this specific waste, which may imply
reduced need of a bulking agent. Moreover, this study shows that
composting can be a feasible way of adding value to fatty wastes.
The three final composts presented very similar and suitable
properties for land application.(undefined