WASTE CARACTERIZATION OF THE SLUDGE DUG FROM THE BOTTON OF "LAGO AZUL", RIO CLARO CITY, SP, BRASIL

Abstract

The generation and final disposal of wastes produced by the human activities are becoming a major concern, related with negative effects over the environment when its disposal occurs in inappropriate ways. One of the main aspects to considerate about the final disposal of wastes is related with its classification. The norm NBR 10.004 "Solid Wastes - Classification", classify them considering its origin and degree of environment hazard based on standards of environment quality and public health. The objective of this research was to characterize the sludge dug from the bottom of Lago Azul, intending its adequate destination. The tests of Leaching and Solubilization and Biodegradation wore realized following the respective technical norms. The analysis of Leaching and Solubilization tests showed that these waste fits in the parameters established by the respective technical norms, so being classified as an inert waste. The biodegradability was determined through the application of 0, 30, 50, 70, 100% of the waste over a soil collected in the sanitary landfill of Rio Claro City. The production of CO2 was monitored though Bartha's respirometric methods for 55 days. Each treatment was built in four repetitions. After the initial period of 55 days glutamic acid and leachate from Rio Claro’s sanitary landfill wore added at two flasks of each performed treatment. The results indicate low biodegradability of the waste, being the achieved maximum biodegradation efficiency of 11,6% by the treatment containing 100% of waste, after the addiction of leachate.