Caracterização e estudo da aplicação e valoração de lodo de estação de tratamento de esgoto de uma instituição de ensino

Abstract

Nowadays, there is a rising concern due to the notable increase in the productivity of sludge from sewage treatment, giving rise to an important question involving the development of alternatives other than the simple final disposal in landfills. This work aims to characterize the sewage treatment sludge from the Federal University of Fronteira Sul – Campus Erechim and to evaluate its application for agricultural purposes and or in the recovery of degraded areas. The characterization of this sludge was performed through the quality parameters such as agronomic potential, stability, toxic inorganic substances, bacteriological indicators and pathogens, according to Brazilian legislation. The results of the analysis showed that the sewage sludge is stable and rich in primary macronutrients, but hat low levels of secondary macronutrients, which does not unviable the use. The chemical and bacteriological analysis of the material revealed that it has not potential for use as an agricultural fertilizer, however it proved to be feasible to be used as a soil conditioner being classified as a class 2B biosolid. In this way, it can be verified that it is feasible to use this sewage sludge as material to recover non-dregraded and degraded areas.