Influência da composição do lodo ativado sobre a sua estabilização em digestores anaeróbios convencionais de mistura completa.

Abstract

In this thesis, an experimental investigation is described which objective was to evaluate the influence of the composition of activated sludge an stabilization by anaerobic digestion. For this five sludge were generated from domestic sewage, with active ( life bacterial mass) fraction ranging from 15 to 72 per cent of the volatile solids concentration. These sludges were digested in conventional anaerobic digestors at room temperatures of (25±3)°C and a retention time of 20 days. During the which investigation the digestors functioned efficiently without any need of addition of corrective Chemicals. It was noted thet the composition of the sludge to be digested influenced markedly upom the quantity of methan generated per unit mass of organic sludge and increased as the active fraction increased. Similarly the solids decay i s influenced: the larger the active fraction the larger the solds decay. It was also observed that the alkalinity general in the digestor corresponded to the mineralization of amônia.