Lodo granular aeróbio no tratamento de efluentes sanitário e industrial

Abstract

In recent decades, research using aerobic granular sludge (AGS) to treat the most diverse effluents has been carried out around the world in different climatic conditions and scales. The growth in the number of treatment plants that use this technology around the world is also notable. This technology presents itself as an alternative to treatment with activated sludge and as another aerobic treatment option with a high potential for removing organic matter and nutrients, as already demonstrated by some studies that achieve removals greater than 90%, it also presents the advantage sludge recirculation is not necessary and has reduced energy expenditure. However, there are reports of biomass instability, formation of small granules, nitrite accumulation, among other issues. In this present work, two sequential batch reactors were operated in parallel, one fed with synthetic dairy effluent (R1) and the other fed with sewage from the city of Uberlândia (R2), both using AGS, with the aim of comparing the use of granular sludge. aerobic in the removal of nutrients and organic matter from two distinct effluents. The two reactors presented high COD removal efficiencies, with values above 93% and 92% respectively, in phosphorus removal R1 presented an efficiency of 75.12% and R2 of 96.16%, in terms of nitrate removal in the An efficiency of 46.61% was observed in R1 and in R2 the values were negative, demonstrating an accumulation of nitrate and a problem in the denitrification process. The sedimentation velocities presented were 21.02 m.h-1 for R1 and 28.41 m.h-1 for R2. The work demonstrates that the use of aerobic granular sludge to treat these two effluents is an option that can be taken into consideration due to the high efficiency in removing organic matter and nutrients presented.