Full Description

The biological activated carbon (BAC) process, which is a combination of ozonation followed by granular activated carbon (GAC) adsorption, has been proposed as a method to improve the cost effectiveness of the GAC process for organics removal. This article examines the effects of implementing the BAC process within conventional US drinking water treatment. The effects of several combinations of ozonation and chlorination on subsequent GAC adsorption were analyzed. Dissolved organic carbon (DOC) removal and volatile halogenated organics (VHO) removal were used to evaluate the effects of preozonation on GAC adsorption. Conventional treatment (with and without chlorination) followed by ozone-GAC increased biodegradation of DOC. Ozonation was shown to interfere with the ability of GAC to treat volatile halogenated organics, suggesting that ozone unit processes may produce low-molecular-weight organics that compete with VHOs for adsorption sites between volatile halogenated organics and the natural background organics. Includes 34 references, tables, figures.

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Edition: Vol. 77 - No. 8 Published: 08/01/1985 Number of Pages: 8File Size: 1 file , 2 MB