TREATMENT OF SLAUGHTERHOUSE WASTE-WATER

In this paper an evaluation of the effluent treatment plant of a slaug hterhouse which processes 650 head of cattle a day is presented. Some problems in the operation of the anaerobic reactor and anaerobic lagoo ns caused by the presence of fats and suspended solids in the effluent were detected. A flotation system by pressurized air injection was te sted at the plant. The fat removal efficiency obtained was 63% and 37% for red water and green water, respectively. In order to improve the hydrolysis of particulate matter, a system of two UASB reactors with r ecirculation, connected in series, was tested at laboratory scale. Rem oval efficiency was 77% for soluble COD and 82% for insoluble GOD. at a volumetric load of 1.8 kgCOD/m(3)/d. Based on the results of these s tudies, several modifications in the treatment plant were proposed. Co pyright (C) 1996 IAWQ. Published by Elsevier Science Ltd.