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Brazil is one of the largest dairy producers in the world, the industry generates 2.5 to 4.0 m3 of wastewater with a high concentration of fats for each cubic meter of processed milk. The use of a cosubstrate in anaerobic biodigestion can promote the dilution of inhibitory compounds and, thus, increases biogas production. The wastewater from the parboiled rice industry is a possible cosubstrate for the anaerobic biodigestion of dairy wastewater, since it has no inhibitory compounds and is generated in large scale in the country. The objective of this study was to evaluate the use of this effluent as cosubstrate for the anaerobic biodigestion process of the effluent from dairy production, both generated in the city of Rio Grande do Sul. The biodigestors operated at 35 °C in batch, and after 276 hours, the biogas production was directly proportional to the cosubstrate content in the mixture, where the highest proportion of rice parboiling wastewater produced the largest biogas volume, 3.39E-03 m3, and the biodigestion only of the wastewater from the dairy industry produced 1.21E-03 m3, evidencing that the wastewater from rice parboiling presents satisfactory results when used as a cosubstrate for the anaerobic biodigestion of effluent from dairy production. K ey w o rd s : C o d i g e st i o n ; biogás; biofuel; sludge; inoculum. WASTEWATER OF RICE PARBOILING AS COSUBSTRATE IN ANAEROBIC BIODIGESTION OF DAIRY WASTEWATER

Efluente da parboilização de arroz como cosubstrato em biodigestão anaeróbia de efluente de laticínios