Applied Environmental Research

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The present study investigates the use of lignite fly ash as a chemical to improve water quality in place of liming material. Two experiments were performed with freshwater and synthetic seawater. Improvement of water quality were measured by using pH and ammonia. The neutralizing value and the application rate of fly ash were studied. The results of the study indicate that the neutralizing value of fly ash is 70%, comparing to standard pure CaCO3 100%. The optimal dosage of fly ash to remove ammonia was 1 g/L. The maximum ammonia removal efficiency at 24 hours in freshwater, 30 ppt, 20 ppt and 10 ppt of synthetic seawater were 61.3%, 36.3%, 29.9% and 24.2%, respectively. The pH value increases with increasing fly ash quantity and contact time. Fly ash has the property of lime material but is less effective than burning lime, hydrated lime and agriculture limestone. However, it is economically feasible. It can be concluded that fly ash has the property of lime material and it can be used as liming material and ammonia reduction in place of zeolite.

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