This paper presents the results of composting of liquid fraction of fresh manure, which is conceived at the same time as a pig wastewater pre-treatment, wastewater volume reduction and a nutrient recovery system.
Two 30 m3 turned windrows were constituted with solid fraction of pig manure and Populus sp. wood chips as bulking material at volume ratios of 1:1 and 1:2 and watered intensely with liquid fraction whilst thermophilic temperatures were maintained.