Comparative Study of the Leachability of Heavy Metals from Sewage Sludge, Sawdust and Organic Fraction of Municipal Solid Waste

This study presents an innovative stabilization method of fly ash derived from co-combustion of municipal solid waste and sewage sludge. Bottom ash, obtained from the same process, is used as a stabilizing agent. The stabilization method involved the use of two other components—flue gas desulfurization residues and coal fly ash. Leaching tests were performed on stabilized samples, aged in a laboratory at different times. The results reveal the reduction of the concentrations of heavy metals, particularly Zn and Pb about two orders of magnitude lower with respect to fly ash. The immobilization of heavy metals on the solid material mainly depends on three factors—the amount of used ash, the concentrations of Zn and Pb in as-received fly ash and the pH of the solution of the final materials. The inert powder, obtained after the stabilization, is a new eco-material, that is promising to be used as filler in new sustainable composite materials.

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Co-biodrying of sewage sludge and organic fraction of municipal solid waste: Role of mixing proportions

Waste Management ◽

10.1016/j.wasman.2018.04.016 ◽

2018 ◽

Vol 77 ◽

pp. 333-340 ◽

Cited By ~ 12

Author(s):

Difang Zhang ◽

Wenhai Luo ◽

Jing Yuan ◽

Guoxue Li

Keyword(s):

Sewage Sludge ◽

Municipal Solid Waste ◽

Solid Waste ◽

Organic Fraction

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Integrated anaerobic codigestion system for the organic fraction of municipal solid waste and sewage sludge treatment: an Italian case study

Journal of Chemical Technology & Biotechnology ◽

10.1002/jctb.5993 ◽

2019 ◽

Vol 95 (2) ◽

pp. 418-426 ◽

Cited By ~ 4

Author(s):

Giulia Moretto ◽

Filomena Ardolino ◽

Alberto Piasentin ◽

Luca Girotto ◽

Franco Cecchi

Keyword(s):

Sewage Sludge ◽

Municipal Solid Waste ◽

Solid Waste ◽

Organic Fraction ◽

Sludge Treatment ◽

Italian Case ◽

Anaerobic Codigestion ◽

Sewage Sludge Treatment

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Anaerobic digestion of co-mingled municipal solid waste and sewage sludge

Water Science & Technology ◽

10.2166/wst.1998.0121 ◽

1998 ◽

Vol 38 (2) ◽

pp. 127-132 ◽

Cited By ~ 18

Author(s):

N. Hamzawi ◽

K. J. Kennedy ◽

D. D. McLean

Keyword(s):

Sewage Sludge ◽

Municipal Solid Waste ◽

Solid Waste ◽

Biogas Production ◽

Empirical Models ◽

Organic Fraction ◽

Primary Sludge ◽

Digestion Process ◽

Solids Concentration ◽

Anaerobic Biodegradability

This study evaluated the technical feasibility of the anaerobic co-digestion process in the context of typical North American solid waste. Using biological activity tests, an optimal mixture was identified with 25% organic fraction of municipal solid waste (OFMSW) and 75% sewage sludge (65% raw primary sludge (RAW), 35% thickened WAS (TWAS)) based on biogas production. Also, based on the rate of biogas production, the most anaerobically biodegradable components of the OFMSW were paper and grass. The TWAS and the newspaper were found to be the least biodegradable components. Lab-scale testing indicated that alkaline pretreatment increased the biodegradability of the sewage sludge/OFMSW mixture the most, as compared to the untreated control. Thermochemically pretreated feedstocks inhibited anaerobic biodegradability as compared to the control, whereas the anaerobic biodegradability of thermally pretreated feed was not found to be significantly different from that of the control. Empirical models were developed based on alkaline dose, feed total solids concentration and particle size for biogas production and removal of TS and VS. All three experimental factors were found to be significant with respect to the response variables studied.

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