Compostagem para tratamento da parcela facilmente degradável dos resíduos sólidos domésticos rejeitada nos processos de triagem de inertes

Abstract

The increasing production of solid domestic waste and shortage of areas where you can make a disposal in an environmentally and technically correct form necessitates the search for alternative treatment or management of such wastes so as to minimize the portion being destined for landfills. In Brazilian cities, the waste of organic origin are predominate in the composition of Domestic Solid Waste, thus, this research aims to employ the composting processes to stabilize the biodegradable portion of waste rejected in waste sorting central located on landfill of São Leopoldo city, RS. In this research were made six compost piles with mixtures of domestic waste and green waste. In three piles domestic waste was previously triturated. The external control of temperature and humidity were made by mechanical aeration. Analyzes were conducted during the composting process and final compost. The sanitary quality of the compost was evaluated by the elimination of pathogens and their potential use by germination testing. In addition was tested potential of using the final compost in a pure form and proportions of mixtures with marble powder and ornamental rocks as corrective of soil acidity. At the end of the process, the physical characteristics of organic matter show that she was stabilized. The piles where domestic waste is not triturated performed better in volume reduction, process profitability and compost maturation time. In the chemical assay, all piles generated products in accordance with applicable legislation, but the results for the quantification of fecal coliform were above the limit. The use of the compounds as a corrective of soil acidity is possible from the mixture with at least 50% of marble powder and ornamental rocks. Germination tests confirmed the good maturity and the absence of phytotoxicity of product reviews.