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CAER Seminars

Scrubbing Wastes via Coal Fly Ash and Incorporation of the Product in Concrete for Civil Engineering Purposes

Roy Lieberman
Ariel University, Ariel 40700, Israel

April 29, 2015 at 10:00am
Ben Bandy Conference Center
UK Center for Applied Energy Research


Coal fly ash (FA) produced via PCC processes in utilities from low sulfur coal is very basic due to high lime content (up to 10%w in South African bituminous coals fired in Israeli utilities). It has also excellent adhesion and pozollanic properties. Thus, it has been found to be an excellent scrubbing and fixation reagent for different chemical wastes, sludges and quarry sludges and also as a neutralization reagent for acidic chemical wastes e.g. from the phosphate and oil regeneration industries). The results have shown that class F FAs is an efficient encapsulation reagent for the above wastes. Thus no leaching of trace elements occurs in the aggregate scrubbed product. Furthermore it is a good partial substitute for cement and aggregates in concrete which is in accord with all civil engineering needs as a building material. The properties of the concrete mixture in which partial replacement of the cement and the sand have improved. At present, in Israel it is utilized in the construction industry with a low economic value. However when utilized as a scrubbing reagent accompanied by using the scrubbed product in concrete production it's economic value is increased appreciably and it is environmentally friendly.