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Chlorite is the dominant degradation byproduct of chlorine dioxide reactions. Compliance withthe maximum concentration of 700 g/L established by new Italian regulations for drinking watercan be achieved by reducing chlorine dioxide dosage during water treatment or by removingchlorite. This work investigated granular activated carbon (GAC) as a technology for chloriteremoval. Research focused specifically on the interference between chlorite and organicmatter removal on GAC active sites and the applicability of a "chemical regeneration" processto improve GAC removal efficiency for organic matter and chlorite. Batch and column testswere performed on both distilled water and surface water spiked with chlorite, virgin,exhausted, and thermally regenerated carbon provided by a surface water treatment plant,and exhausted GAC after chemical regeneration by means of acid, base, and base-acidsolutions. Results demonstrated that GAC can be an efficient method for chlorite removal. Includes 12 references, tables, figures.

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Edition: Vol. 98 - No. 12 Published: 12/01/2006 Number of Pages: 8File Size: 1 file , 470 KB