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Environmental impact of sewage sludge ash assessed through leaching

Domagoj Nakić ; University of Zagreb, Faculty of Civil Engineering
Dražen Vouk ; Water Research Department, Faculty of Civil Engineering University of Zagreb
Shane Donatello ; Institute for Prospective Technological Studies, Joint Research Centre
Aleksandra Anić Vučinić ; Faculty of Geotechnical Engineering, University of Zagreb

Puni tekst: engleski PDF 655 Kb

str. 222-234

preuzimanja: 405



As part of a wider feasibility study on the possible reuse potential of Croatian sewage sludge ash, ash has been produced by laboratory incineration of sewage sludge from two Croatian wastewater treatment plants. The Croatian sewage sludge ash was tested for soluble heavy metals according to EN 12457 and results considered in the context of EU landfill Waste Acceptance Criteria. With sewage sludge ash alone, the main soluble elements/ions of concern were (in decreasing order): Mo, SO4, Cr and Cl. When obtained ash was incorporated into cement mortars at cement replacement rates of 20%, EN 12457 leaching of the crushed mortars demonstrated compliance with the strictest limits for inert landfill Waste Acceptance Criteria and well within other limits specified for use in road bases. However, much of the reduction in leaching levels can be attributed to the dilution effect of sand used in mortars. In the cases of Se, Cr, F and Cl, results imply that the cement used in the mortars actually represents a more significant source of soluble Se, Cr, F and Cl than the produced ash. Regardless, the overall results reveal that leaching of heavy metals and other ions is not a significant concern that would prevent the potential reuse of Croatian sewage sludge ash in cement mortars or concretes should Croatian wastewater treatment plants opt for sewage sludge incineration as an alternative sludge disposal and management option.

Ključne riječi

sewage sludge ash (SSA), heavy metals, leaching, landfill, cement mortar

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