Estudo de escala de reatores anaeróbios de batelada tratando resíduos sólidos orgânicos.

Abstract

In this research, the anaerobic treatment process of the putrescible organic fraction from municipal solid waste with sludge seeding was evaluated. The experimental system was built at EXTRABES (Estacao Experimental de Tratamento Biologico de Esgoto Sanitario), in Campina Grande City, State of Paraiba. Three anaerobic reactors (200 L - RI; 20 L - R2; 9 L - R3) were monitored during 260 days and the biostabilization process efficiency was estimated in connection with the reactor size. For this study, the three reactors were operated with the same organic load (780 kgosw/m3reacior), the same sludgewaste moisture content (80%) and the same seeding material percentage (40%). The samples collections was made in solid, liquid and gas fractions, and its performance was evaluated upon the ratios of reduction from the parameters: Total Volatile Solids and Substrate Mass. The results showed that reactors efficiency decline with the size. The biogas produced by reactors Rl and R3 presented significant power potential, since it was constituted nearly by 70% of methane. The percolated from all the reactors showed good reductions of DQO, STV, AGY, NTK, PT, fecal coliforms and streptococci. Probably, the continuous additions of sewage was the cause of fluctuations in coliforms and streptococci exhibited along the process, although the fecal streptococci's one has been more constant.