A trial was conducted to evaluate the efficiency of composting of residues system and passive aeration for treating animal residues in Capão do Leão, in Rio Grande do Sul, Brazil. A low-density polythene film covered up a laterally opened structure was used. Such structure was to protect six plastic and glass fiber boxes. The study was carried out with two treatments, which were constituted by a mixture of liquid bovine residues and wood shaving; and a mixture of liquid bovine residues and poultry litter. SISCODE is efficient for transformation of the liquid in solid residues, given that local high-relative humidity and the low environmental temperature do not affect such residues treatment system. Passive aeration is not efficient for both evaporating excess of water and oxygenating composting substrates. Therefore, it should not be used for composting a mixture of liquid and solid residues from animal production.
dairy production; poultry litter; liquid residue; environmental sustainability
