The effect of seeding material (treatments) upon degrading liquid waste of swine was evaluated at different hydraulic retention times (0, 30, 60, 90, 120, 150, 180 hours). A commercial seeding material according to the recommended manufacture dosage, three alternative seeding materials based on bovine manure, chicken manure, and domestic sewage, all of them applied at the dosage of 5ml/l, and a control treatment (without seeding material) were used. An entirely randomized design was set to study the subdivided fragments using three repetitions. After each detention time, the following analyses have been performed: pH, biochemical oxygen demand (BOD), chemical oxygen demand, total solids, total volatile solid, settling solids, air and liquid temperatures. The commercial and alternative seeding materials based on chicken waste promoted a higher reduction of BOD than the other ones, 68.5% and 67.5%, respectively.
swine; anaerobic digestion; in vitro analysis
