BULK DENSITY AND AGGREGATE STABILITY IN TECHNOSOLS DESIGNED FOR ECOLOGICAL RESTORATION OF EXTRACTIVE ACTIVITIES

摘要

The restoration technologies in areas degraded by extractive activities require the use of their own mine spoils. Reducing deficiencies in physical properties, organic matter, and nutrients with a contribution of treated sewage sludge is proposed. This experiment was based on a controlled study using columns. The work was done with two mine spoils, both very rich in calcium carbonate. Two biosolids doses were undertaken (30,000and 90,000 kg/ha of sewage sludge) in addition to a different mine spoils used as substrates. The water contribution was provided by a device that simulated short duration rain. The leached water was collected 24 hours after the last application. The experiment saw the bulk density decrease and the aggregate stability increase, thereby improving the structure. The improved soil structure decreases its vulnerability to degradation processes such as erosion and compaction.