The aim of this work was to analyze pH and humidity variations of fine wastes from processing dimension stones. Samples were collected during block cutting; plate polishing; after filter press and at deposits of different ages, including a temporary deposit 3 months old, a deposit of wastes 5 years old and another 20 years old. The pH and humidity were measured according to NBR 10.004/2004 and NBR 10.006/2004. Regarding pH values, wastes are not classified as dangerous in any case. Such parameter decays with time, even at inadequate storing conditions. This research showed that the use of a filter press decreases the pH and humidity of wastes according to regulatory requirements and the same results can be reached using correctly built pond drying. Humidity problems were found in the ancient deposit, where values increased at depth, reaching levels similar to newly generated wastes even after 20 year of storing. These wastes are located at alluvial plain, near a drainage channel.
pH; humidity; waste management; dimension stones
