Abstract
In this study, two anaerobic sequencing batch reactors (ASBR) installed in series were evaluated in pilot-scale testing (volumes of 280 L and 140 L, respectively) for the treatment of swine wastewater with total solids suspended (TSS) around 10,000 mg/L. The organic loading rates (OLR) applied on the first ASBR varied from 4.43 to 12.75 g total COD per (L d). For the post-treatment of the effluent generated in the ASBR, two polishing ponds were used (1000 L volume each) in series. The mean removal efficiencies of total chemical oxygen demand (COD) and of TSS varied from 53 to 86% and from 56 to 85%, respectively, in the anaerobic treatment system composed by the RSBAn. The volumetric methane production of the anaerobic treatment system with the ASBR varied from 0.628 to 0.796 m3/(m3d). The use of polishing ponds, in series, has allowed the maintenance of mean removal efficiencies above 89% and 91% for total COD and TSS, respectively. The mean removal efficiencies of total Kjeldahl nitrogen (TKN) and total phosphorus (total-P) varied from 30 to 82% and 42 to 100%, respectively, in the anaerobic treatment system with the ASBR following by the polishing ponds. The use of the polishing ponds in series has allowed the maintenance of mean removal efficiencies above 80% for Zn and 76% for Cu. The number of fecal coliforms was reduced to 8x103 MPN/100 mL.
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