Análise da eficiência do tratamento de efluente advindo de processo industrial submetido a diferentes tempos de reação em reator anaeróbio operado no regime de batelada

Abstract

The development of industry causes negative impacts to the environment with the generation of liquid effluents arising, especially, industrial processes, which should be provided with appropriate treatment prior to final disposal. Relate the cost of treatment with efficiency is a challenge to the process. In this perspective, the work in question sought to associate the anaerobic biological treatment to the batch process, with the purpose of obtaining satisfactory results for removal of pollutants with high concentrations of organic matter, aiming low hydraulic retention time (HRT). The comparison was made for two distinct cycles which variant was the time of unrest in reaction step, the first cycle with total time of 10h40min, with stirring 10h obtained maximum efficiency of 75% for removal of cod, with an average of 1160 ± 150 mg/L of cod tributary and the 367.5 ± 72.6 mg/L COD effluent, the second cycle with total time of 9h40min and 6h agitation in reaction step, obtained maximum efficiency in removing COD in 63%, with COD tributary 1080.6 average ± 134 mg/L and 432.6 ± 54.4 mg/L mg/L COD effluent. The good results indicate, in accordance with resolutions of the national environmental Council (CONAMA), batch operation becomes an alternative to disposal of treated effluent, as self-depuration capacity of recipient body.