Estudo de metais pesados na biodigestão de lodos

Abstract

ln order to provide sound information to operate Municipal Treatment Plant digesters at highly industrialized areas, studies on metal toxicity to anaerobic digestion were developed. This paper presents results achieved in lab scale digesters with discontinuous zinc additions. Two control digesters plus two test digesters were run, one wit ZnCl2 additions and the other with ZnSO4 additions. Zn was added to the feed sludge at increasing concentrations until inhibition was observed. Inhibitory concentrations in 'the digesters were 960 mgZn/l (added as ZnSO4) and 275 mgZn/l (added as ZnC12).