Resumo

TELLO ESPINOZA, Pilar  e  FERNANDEZ VILLAGOMEZ, Georgina. Evaluation of leachate generation in wrapped bales urban solid waste: Full scale experiment. Rev. Int. Contam. Ambient [online]. 2012, vol.28, suppl.1, pp.85-89. ISSN 0188-4999.

The study evaluated under full scale application the formation of leachate in bales of urban solid waste wrapped with low density polyethylene (LDPE) containing more than 50 % organic matter under similar conditions would occur in Mexico. The research study was conducted over a period of fifteen months. The experiment used one ton bales of urban solid waste which was wrapped in two different ways: 13 bales were wrapped using only LDPE and only one LDPE wrapped bale was encapsulated with high density polyethylene to evaluate biogas formation. In both cases it was observed the formation of leachate and it was measured pH, chemical oxygen demand (COD), and volatile fatty acids (VFA) in leachate, % moisture and % organic matter in wastes, apart from the weather in the area. The results showed that leachate could be measured in 3 of the 13 LDPE wrapped bales, in the others it was observed that there was also formation of leachate but could not be measured because it had evaporated. However, the leachate generated encapsulated bale with COD values from 30 588 to 44 791 mg/l, the VFA were presented from the 5^th month with values of 14,103 mg/L on average. The pH of the encapsulated bale remained 7.2 to 8. From the 12^th month there were metanogenic conditions in leaching stage and the amounts were minimal, which is found that the sealing of the waste does not inhibit the anaerobic decomposing waste, but minimizes the amount of his generation due to wrapping and compression of the bales avoid the influence of rain.

Palavras-chave : volatile fatty acids (VFA); anaerobic digestion; chemical oxygen demand (COD); final disposal; pH.

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