Abstract
The objective of this study was to apply the technique of electrocoagulation (EC) in the treatment of dairy industry wastewater, using a system of bench. It was used a source of 10 amps and an electrode of iron containing six plates of 14x6 cm. Were made variation of pH (4.5 to 6), intensity of electric current (1 to 2A) and time of electrolysis (30 to 60 min.). The efficiency of the treatment was confirmed by analysis of turbidity, color and COD. The reduction of turbidity was greater than 98%, reaching a record 99.98%. The largest reduction in color was 94.90% and 11 of the 27 tests the efficiency was greater than 90%. The greatest reduction of COD was 96.36%. The treatment proved to be more efficient at pH 4.5, time 60 min. and current 1.5A. The estimated cost of operation was US$ 1.04 m 3 which demonstrates the viability of treatment of dairy industry wastewater.
Highlights
The contamination of natural waters is currently a major problem that is leading environmental control agencies to establish stricter limits for the disposal of effluents into the environment
The EC technique was applied using a system of bench (Figure 1) mounted in the chemistry lab at the State University of Maringá (UEM)
The application of the EC technique to dairy industry wastewater was demonstrated to be efficient in reducing the studied parameters, obtaining a 99.98% efficiency for reducing turbidity, a 94.90% efficiency for reducing color and a 96.36% efficiency for reducing COD in its best configuration
Summary
The contamination of natural waters is currently a major problem that is leading environmental control agencies to establish stricter limits for the disposal of effluents into the environment. Chemical treatments can induce a secondary pollution linked to chemical additives added, which may contaminate the treated water (DEMIREL et al, 2005). Dairy industries represent an activity of great importance for the food sector Brazilian, though its contribution in terms of pollution is very significant. The water is the natural resource more employed in industry and their use is linked to the guarantee of hygiene and sanitary conditions. The sanitation of dairy products includes silos washes operations, Acta Scientiarum. Technology pipes, tanks, pasteurizers and equipment that require large volumes of water (BRIÃO; TAVARES, 2012)
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