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Revista EIA

Print version ISSN 1794-1237

Abstract

FERIA DIAZ, Jhon Jairo  and  MARTINEZ ACOSTA, Luisa Elvira. BOTTOM SLUDGE TREATMENT OF FACULTATIVE PONDS WITH STABILIZATION IN LABORATORY CONDITIONS. Rev.EIA.Esc.Ing.Antioq [online]. 2014, n.21, pp.113-122. ISSN 1794-1237.

In this paper we show the results obtained in the chemical stabilization process of pond sludge by adding common hydrated lime. Dosages of 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 of Monteria in Colombia. Dangerousness (corrosivity, flammability and reactivity) and concentrations of sulfides, heavy metals (As, Ba, Cd, Cr, Hg, Ag, Pb, Se), coliforms, salmonella, ascaris and other helminths were analyzed in the sludge sample, before and after the application of an optimal 10% dosage. The reactivity by sulfides and cyanides in the sludge sample was controlled with this dosage, however, coliforms and mesophilic bacteria concentrations did not decrease. Some heavy metals increased (Cd, Cr, Hg, Ag, Pb) after the application of hydrated lime dosage, although the concentrations found are not representing environmental danger according to existing environmental regulations.

Keywords : Sludges; Hydrated Lime; pH; Heavy Metal; Reactivity; Coliforms.

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