TREATMENT OF BOTTOM SLUDGE FROM FACULTATIVE LAGOONS WITH STABILIZATION IN LABORATORY CONDITIONS

TREATMENT OF BOTTOM SLUDGE FROM FACULTATIVE LAGOONS WITH STABILIZATION IN LABORATORY CONDITIONS

Contenido principal del artículo

Jhon Jairo Feria Diaz
Luisa Elvira Martinez Acosta

Resumen

In this paper we show the results obtained from the chemical stabilization process of pond sludge by adding common hydrated lime. Doses of lime at 5%, 7%, 9%, 10%, 11%, 12%, and 15% were added in controlled laboratory conditions to a sample of sludge taken from the bottom of the primary facultative pond of the wastewater treatment system in Monteria in Colombia. The sludge’s dangerousness (corrosiveness, flammability, and reactivity) and concentrations of sulfides, heavy metals (As, Ba, Cd, Cr, Hg, Ag, Pb, Se), coliforms, Salmonella, mesophilic bacteria, Ascaris lumbricoides, and other helminths were analyzed in the sludge sample before and after application of an optimal 10% dose. The reactivity due to sulfides and cyanides in the sludge sample was controlled with this dose, but coliforms and mesophilic bacteria concentrations did not decrease. Some heavy metals (Cd, Cr, Hg, Ag, Pb) increased after application of the hydrated lime dose, although the concentrations found do not pose environmental danger according to existing environmental regulations.

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Biografía del autor/a (VER)

Jhon Jairo Feria Diaz, Universidad Pontificia Bolivariana

Sanitary engineer. MsC. en Environmental Sciences. Professor in Sanitary and Environmental Engineering Faculty. Coordinator of the Research Group Water Quality and Water and Environmental Modeling-CAMHA. Universidad Pontificia Bolivariana, Montería (Colombia).

Luisa Elvira Martinez Acosta, Universidad Pontificia Bolivariana

Civil Engineering. MsC. in Civil Engineering with emphasis in Environmental. Professor in Civil Engineering Faculty, Universidad Pontificia Bolivariana, Montería (Colombia).