Decomposition of paper de-inking sludge in a sandpit minesoil during its revegetation

Pulp and paper mill by-products as soil amendments and plant nutrient sources

“…Decomposition of paper mill sludge occurs in a two-phase process with a rapid decomposition period of short duration preceding a slow decay over a long time. Fierro et al (2000) found about half the sludge mass had a half-life of 0.4 yr, while the other half had a half-life of 13 yr. Similar estimates were obtained by Chantigny et al (2000b), a rapid-decay phase with a mean residence time of 0.1-0.3 yr followed by a slow-decay phase with a mean residence time of 8.5 yr.…”

“…Monitoring of soil carbohydrate composition revealed that cellulose degradation was mostly involved in the rapid decay phase, whereas lignin was responsible for the slow decay phase of deinking sludge (Chantigny et al 2000b). More than 40% of the sludge remained in the soil 2 yr after incorporation (Chantigny et al 1999;Fierro et al 2000). Recalcitrance has been attributed to inclusion of clay in the sludge from the papermaking process (Fierro et al 2000), and physical encrustation of the paper fibers by soil particles (Chantigny et al 1999) as well as the biological recalcitrance of the C compounds themselves.…”

“…More than 40% of the sludge remained in the soil 2 yr after incorporation (Chantigny et al 1999;Fierro et al 2000). Recalcitrance has been attributed to inclusion of clay in the sludge from the papermaking process (Fierro et al 2000), and physical encrustation of the paper fibers by soil particles (Chantigny et al 1999) as well as the biological recalcitrance of the C compounds themselves. High sludge application rates have large and persistent effects on soil organic matter while low rates of application generally result in smaller increases that are mostly detectable in the year of application.…”

“…The plant available water holding capacity of a sandpit soil (0.94 kg kg -1 medi- (Fierro et al 1999). The slow decay of the sludge and/or the presence of clay in the sludge contributed to the persistent impact on soil water holding capacity (Fierro et al 2000).…”

Potencial de producción de biochar en España a partir de residuos de la industria papelera, de lodos de E.D.A.R., de residuos sólidos urbanos y de residuos ganaderos: Estudio de la fijación de carbono

“…Debido al alto contenido en materia orgánica, estos residuos se pueden usar como enmienda orgánica para mejorar o restaurar la fertilidad del suelo y las funciones biológicas (Chantigny, et al, 1999;Fierro et al, 2000). La aplicación en agricultura y en la restauración de suelos incrementa el rendimiento y el crecimiento de la planta y mejora las propiedades del suelo como el contenido en materia orgánica, la capacidad de retención de agua y la capacidad de intercambio catiónico (Chantigny, et al, 2000).…”