Applicability of compartmentalized anaerobic reactor system followed by anaerobic filter on small swine wastewater treatment

ABSTRACT

The aim of this work was to assess the performance of a system composed by a compartmentalized anaerobic reactor (CAR) followed by anaerobic filter (AF) in the treatment of the wastewater of as mall pigfarm.The following parameters were analyzed: pH, total volatilefatty acids (VFA), total demand of chemical oxygen (DCOt), dissolved chemical oxygen demand (COD_diss), chemical oxygen demand due to suspended solids (COD_SS), total suspended solids (TSS), volatile suspended solids (VSS) and total kjeldhal nitrogen (TKN). The effluents and AF values for the CAR, the DCOt, TSS and TKN were 6,633 and 4,361mg.L^-1, 2,418 and 595 mg.L^-1, and 888 and 954 mg.L^-1, respectively, for a volumetric organic load (VOL) of 7.01 kgDCO(m³.d)^-1 in CAR and 28.3 kgDCO(m³.d)^-1 in AF, and hydraulic detention time of 70.5 hand 17.8 hin CAR and AF, respectively. The CAR system followed by FA presented a mean removal efficiency of 88.8% for COD and 80.5% for TSS. It is concluded that the anaerobic treatment system consisting of CAR followed by AF was efficient in removing DCO and TSS, allowing with the imposed operating conditions to achieve average removal values above 80%, becoming a great alternative for wastewater treatment in small swinefarms.

Keywords:
environmental impact; swine manure; anaerobic digestion