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| Last Updated:: 10/07/2013

Fly Ash: A Potential Excellent Scrubber for Acidic Wastes in Israel

 

2003 International Ash Utilization Symposium, Center for Applied Energy Research, University of Kentucky, Paper #51. Copyright is held by the Authors.

http://www.flyash.info

 

 

Fly Ash: A Potential Excellent Scrubber for Acidic Wastes in Israel

 

Haim Cohen1,2

1- Chemistry Department, Ben-Gurion University of the Negev, Beer-Sheva, Box 653, 84105 Israel
2- Chemistry Department, NRCN, Beer-Sheva, Box 9001 Israel phone: 00972-8-6472170 fax:00972-8-9200749 email: hcohen@bgumail.bgu.ac.il

 

 

Bituminous coal combustion in large utility plants is the main source (78% in 2001) of power generation in Israel and the annual coal consumption is 12.5 Mtons in four power stations. Coal ash is a byproduct resulting in ~1.5 Mtons per year (90% accounts for fly ash) that should be utilized or disposed off properly in order to avoid environmental problems. At present ~43% of the fly ash is used as cement additive to clinker (10%w in the product) and the rest as construction material for embankments and road basements.

 

The Israeli fly ash is highly basic when exposed to water, due to the very low sulfur content of feed coals (because of strict environmental regulations in respect to SOx emissions).

 

Thus, the fly ash is a potential chemical scrubber for acidic wastes. In this study, coal fly ash has been examined as a scrubber for acidic wastes produced from the regeneration process of used motor car oil and the phosphate fertilizers industry. The results show that the fly ash can be used as a very efficient scrubber of the sludge. Furthermore the trace elements and the organic components are fixed within the fly ash particles efficiently. The product leaching limits are within the CAL WET leaching test, thus it can serve as a good aggregate in concrete production. Bricks produced using the aggregate as sand substitute, have proved to be hard enough according to the concrete standards in Israel and the leaching of the trace elements from the bricks is within the environmental regulations (the CAL WET test). The neutralization and fixation processes will be discussed in detail.

 

 

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