This work aimed to evaluate the performance of two aerobic-anaerobic combination system of upflow anaerobic sludge blanket digestion reactor (UASB) in line followed by an aerobic sequencing bath reactor (SBR), used in swine wastewater treatment. The UASB system was fed with swine wastewater containing from 4427 to 16425 mg L-1 of total suspended solids (TSS). The treatment system was evaluated using organic loading (OLR) of 14,8 to 24,4 g total COD (L d)-1 in the first UASB reactor. The hydraulic detention times (HDT) were of 28 and 11 h, and 14 and 6 h, in the first and second UASB reactor, respectively. The SBR was operated with one and two cycles daily and the affluent had TSS concentrations of 1348 to 2036 mg L-1. The higher total chemical oxygen demand (COD) removal efficiencies were of 78 to 81% in UASB reactors in two-stage and occurred with higher HDT. With the aerobic SBR used as post-treatment of the effluent from UASB reactors allowed removal efficiency averages of 93 to 97%, 92 to 98%, 57 to 78%, 71 to 88% and from 68 to 85% of total COD, TSS, total P, total Kjeldahl nitrogen (TKN) and total nitrogen (TN), respectively. The thermotolerants coliforms the removals were of 93.80 to 99.99%.
nutrients removal; anaerobic-aerobic treatment; post-treatment; nitrification
