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SAHU, B. K.; JAYARAM, S. Environmental impact of fly ash pollution on aquatic life. In: CIB SYMPOSIUM ON CONSTRUCTION E ENVIRONMENT: THEORY INTO PRACTICE, 2000, São Paulo. Anais… São Paulo, 2000.
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Abstract

Alarmingly high accumulation of fly ash globally has led Geotechnical engineers into finding a solution for the use of fly ash as a construction material in the recent past. There is a general opinion amongst the Geotechnical engineers that fly ash is a non-hazardous material. However, the authors felt that it may not be entirely true due to the fact that fly ash does contain quite a significant proportion of soluble salts. These salts would leach into water if fly ash comes in contact with it under any situation. In the present investigation, effort was made to study the accumulative effect of the solubility of salts present in fly ash. The effect of soluble salts of fly ash was studied by measuring the changes in pH and dissolved oxygen (DO) levels. It was found that with the addition of fly ash in water the DO levels decreased while the pH increased. The magnitude of the variations in DO levels and pH was proportional to the fly ash proportions. The concentration of fly ash more than 5% decreased the DO level to less than 3ppm, which is detrimental to aquatic life. The authors would like to emphasize that the findings of the present investigations are being submitted to open an agenda on the issue of water pollution by the fly ash leachate.
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