Influência da concentração de sólidos totais e da temperatura no processo de co-digestão anaeróbia de resíduos sólidos orgânicos

Abstract

In this study, we investigated the influence of the concentration of total solids and temperature in the process of anaerobic co-digestion of organic solid waste in one batch -1 -1 reactors, using three different concentrations of total solids: 30.5 g.L (ST1); 39.5 g.L -1 (ST2) and 48.2 g.L (ST3), and three levels of temperature: ambient (average 24 ° C) (T1), 35 ° C (T2) and 40C (T3). The experimental system was built, installed and monitored for 180 days in the physical facilities of the Experimental Biological of Sewage Treatment Station (EXTRABES) of the State University of Paraíba, Campina Grande - PB, Brazil. For power reactors was prepared substrate in a proportion of 80% of crushed vegetable solid waste and sieved at 2 mm mesh and 20% anaerobic sludge from UASB reactor treating domestic sewage. The best results with regard to removal of DQOT, TKN, proteins, carbohydrates, besides solubilization of COD and increase the concentration of N-NH4, were coming from the treatment at 35 ° C. On the other hand, the total solids -1 concentration of 30.6 g.L , provided the best efficiency in the bioconversion of organic matter. The highest yield of biogas and CH4 gas was observed for treating the substrate with a lower concentration of total solids and 35 ° C.