Abstract
The present paper deals with the fly ash utilization as a sludge conditioner prior to dewatering in a wastewater treatment plant. The term fly ash describes the particulate residue resulting from the combustion of coal. The fly ash evaluated in this study is a by-product of thermal power plants in Greece. The chemical composition of this fly ash consists of silica (Si02), alumina (Al203), iron oxide (Fe203) and is particularly rich in calcium oxide (CaO). Therefore it contains the appropriate constituents to cause flocculation and adsorption of the sludge particles. The mechanisms of the fly ash conditioning action are examined in relation to its physicochemical characteristics (ie chemical composition, particle size etc.). Experiments show that the advantageous use of fly ash is comparable with other usually chemical conditioner agents used like Al2(SO4)3, Kaolin. Therefore significant decrease of the specific resistance of the cake was observed when fly ash was used in the range of 8%.
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Schedule a callMore From: Water Pollution Control in Asia: Proceedings of Second IAWPRC Asian Conference on Water Pollution Control held in Bangkok, Thailand, 9–11 November, 1988
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