Tannery and coal mining soil decomposition evaluated by microbial activity
Abstract
Tannery residues and coal mining refuse are important polluting sources in Brazil, mainly
in the southern Rio Grande do Sul and Santa Catarina states. In order to study the tannery and coal
mining soil decomposition evaluated by microbial activity was carried out an experiment in controlled
conditions using and Acrisol under grassland. Eight treatments were applied contend tannery sludge,
leather shavings and coal refuse. Tannery sludge was efficient to increase the pH and nitrogen supply
to system. Mineral chromium (Cr (III)) applied with tannery sludge affected the microbial activity
evaluated by C-CO2 release. The tannery sludge can be used to soil acidity amelioration caused by
coal refuse with high reduced sulfur content (pyrite). The leather shavings can be disposed in soil;
however, it is necessary a lime application, and nitrogen, phosphorus and potassium amendment for
crop production. Coal refuse has a soil acidification potential and low decomposition rate.
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