ANALYSIS OF THE USE OF CONSTRUCTION WASTE AS SOIL ACIDITY CORRECTIVE

Abstract

The construction and demolition waste (CDW) can be used as soil acidity corrective, which allow its final destination as an input of agricultural and environmental interest, beyond pollution control. This alternative of final destination makes possible the reduction on the amount of solid waste disposed in landfills, which will reduce the environmental impact and increase the useful life of the landfills. Therefore, the objective of this study was to evaluate the use of the construction waste to correct the pH of an acidic soil, typical of the southeastern region of Brazil. The CDWs used were collected in static buckets positioned next to building sites in Belo Horizonte, MG; sifted at less than 0.297 mm diameter and incorporated into an oxisol (red yellow latosol) collected on an exposed slope at Federal University of Minas Gerais (UFMG). Then, an incubation curve (after 21 days of incorporation of the waste to the soil) was performed varying the dose of the construction waste to the soil, aiming to obtain a pH x dose curve. Using logarithmic regression, the equation pH = 0.5454 ln(Dose) + 6.9646 was defined as ideal to describe this relationship. Thus, for the agricultural use it will be necessary a dose of 1,71 t ha-1, while, for pollution control, it will be necessary a dose of 46,28 t ha-1.