Tratamento de água residuária de suinocultura em reatores anaeróbicos (RAC-UASB) com desinfecção em foto reatores UV

Abstract

This research aims to evaluate the performance of an anaerobic baffled reactor (ABR) followed by an upflow sludge blanket reactor (UASB) treating wastewater of hog production followed by disinfection in UV photo reactors for agriculture reuse. The start-up was based on total solids settling parameters of hog wastewater (HW). The value of the sludge volumetric index (SVI) was 25.5 mL L-1 and total solids was about 24,528 mg L-1. The ABR/UASB system, operated in series with a hydraulic retention time (RHT) varying from 14.45 h until 9.06 h, respectively. Analyzing the mean values of DBO520°c and CODtotal it can be noticed that both parameters have declined throughout the treatment, providing efficiencies in the removal of DBO520°c C 68% (ABR) and 55% (UASB), and CODtotal of 78% (ABR) and 70% (UASB). For subsequent disinfection treatment two photo reactors were used. These reactors were designed to operate on the liquid surface, without contacting between the lamp and the liquid effluent. The lamp employed in each one of the photo reactors was germicidal fluorescent type, with wavelength of the 230 nm, power of 30 Watts. The RHT adopted in the photo reactors was about 0.063 days (90.6 minutes). It was evidenced that the start-up process allowed rapid formation of biomass and also the UV photo treatment demonstrated high disinfection and stabilization of soluble compounds, thereby reducing the potential pollution.