EDAFOLOGIA, Vol. 10 (2), pp. 161-170, 2003


RIESGOS DE CONTAMINACIÓN POR LIXIVIADOS DE ENMIENDAS ORGÁNICAS ESTABILIZADAS APLICADAS SOBRE SUELOS


Ma Y. FERRADÁS, A. NÚÑEZ DELGADO, S. SEOANE LABANDEIRA


Dept. Edafología y Química Agrícola, Escuela Politécnica Superior, Campus Univ. s/n, 27002 Lugo (España). Universidad de Santiago de Compostela. E-mail: edyudani@lugo.usc.es


Abstract

We evaluate water pollution risk after the spreading of a mixture containing 70% wood ash and 30% sewage sludge. We study the physico-chemical characteristics of the by-products and its mixture, as well as those referred to the receiving soil. Then we evaluate eventual pollution risks related to the use of these mixtures on soil. A three soil column study was performed, where soil and a dose of 30t ha-1 of the mixture were employed. Percolates were generated by using distilled water, and then the contents of nutrients and pollutants were analysed, in order to elucidate pollution hazards and solute trans- port dynamics.
The dose of mixture here studied (30t ha-1) does not cause water pollution.

Keywords: wood ash, sewage sludge, organic amendments, soil pollution.