Evaluación de tres tipos diferentes de lodos de depuradora en su aplicación agrícola

• Autores: Pedro Soler, Juan Carlos García Gil, Alfredo Polo Sánchez
• Localización: Residuos: Revista técnica, ISSN 1131-9526, Año nº 8, Nº 44, 1998, págs. 82-86
• Idioma: español
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• Resumen

  • Soil application of three sewage sludges (compost, dewatered and liquid) has been studied. Sludges were applied at two different rates: 20 and 80 t ha·1 for compost and dewatered sludge and 400 and 800 m3 ha·1 for liquid. Measurements were made of soil physic-chemical properties, nutrient status, heavy metal content and carbon fractions. Slights fall in soil pH and rises in electrical conductivity were observed, especially with the high rates. In the latter, soil nitrogen and phosphorus contents increased considerably. The carbon fraction study revealed an increase of soil organic matter greater and the humic substances with a clear response effect to the rates applied. Heavy metal analysis showed all treatments to produce concentrations below maximum permitted levels. Only high-rate compost led to an increase in total concentration of some of the heavy metals and in the potentially available fraction.