Although there had been experiences applied on farming soils Zhao and Bache, 2001; Franco and Salvador, 2004, such sludge is not considered as an optimal material because of its poor nutrients level, thus its use has been basically restricted for forestry activities Grabarek and Krug, 1987; Scambillis, 1997 and the recovery of deteriorated soils, abandoned mine sites and quarries Geertsema et al., 1994.
Aunque existen experiencias de aplicación en suelos para uso en actividades agrícolas Zhao y Bache, 2001; Franco y Salvador, 2004, estos lodos no se consideran un material óptimo por su bajo nivel de nutrientes, siendo su uso circunscrito básicamente a actividades silvícolas Grabarek y Krug, 1987; Scambillis, 1997 y recuperación de suelos degradados y de minas o canteras abandonadas Geertsema et al., 1994.