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A role for adsorption in lead leachability from MSWI bottom ASH.
F R Chaspoul1, M F Le Droguene, G Barban
1Laboratoire de Prévention des Risques et des Nuisances Technologiques - EA 1784, Faculté de Pharmacie, Université de la Méditerranée, 27 bd Jean Moulin, 13385 Marseille cedex 05, France.
Waste Management (New York, N.Y.)
|September 21, 2007
Summary
Bottom ash from municipal solid waste incineration (MSWI) effectively adsorbs lead, showing high capacity. Leaching studies reveal a sorption/desorption mechanism and identify two lead species, Pb(OH)4(2-) and a surface-sorbed complex.
Area of Science:
- Environmental Science
- Materials Science
- Geochemistry
Background:
- Municipal solid waste incineration (MSWI) bottom ash possesses high porosity and surface area, making it a potential adsorbent for heavy metals in wastewater.
- Understanding lead leachability from MSWI bottom ash is crucial for its effective application in wastewater treatment.
- This study investigates lead behavior during leaching from different types of MSWI bottom ash (NH, W, and H).
Purpose of the Study:
- To investigate the behavior of lead leaching from MSWI bottom ash.
- To determine the adsorption capacity and mechanism of lead onto different types of bottom ash.
- To identify the species of lead present in the leachate and sorbed onto the ash.
Main Methods:
- Leaching kinetics experiments were conducted to understand the sorption/desorption mechanism and equilibrium.
- Adsorption experiments were performed to evaluate the adsorption capacity and mechanism.
- X-ray absorption spectroscopy (XAS) was used to identify lead species sorbed on the bottom ash surface.
Main Results:
- Leaching kinetics indicated a sorption/desorption mechanism reaching equilibrium.
- All tested bottom ash types (NH, W, H) demonstrated high saturation coverage and considerable adsorption capacity for lead.
- Adsorption primarily occurred through an ion exchange mechanism.
- Successive leaching experiments identified two lead species: Pb(OH)4(2-) in the leachate and a lead complex sorbed on Fe colloid or FeOOH polymers.
Conclusions:
- MSWI bottom ash exhibits significant potential as an adsorbent for lead removal from wastewater.
- The adsorption process is governed by ion exchange and involves at least two distinct lead species.
- Further research into the specific forms of lead and their interactions with bottom ash components can optimize its application.
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