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Full-scale biofiltration experiments demonstrated that good removal of biodegradable organicmatter (BOM) following ozonation could be achieved without compromising particle removal.BOM removal by granular activated carbon (GAC) filter adsorbers and dual-media filters wasmeasured using total organic carbon (TOC) and certain BOM components (carboxylic acids).The authors investigated how filter backwashing with water, water and air scour, and waterand air scour at collapse-pulsing conditions affect filter biomass, BOM removal, and particleremoval. At 21-24C, the media type did not affect BOM removal. At 1-3C, GAC providedsubstantially better removal of oxalate and TOC than did anthracite. For both media types, coldwater oxalate removals were significantly impaired, compared with those achieved in warmwaters. BOM removal was more resilient than particle removal to changes in backwashprotocol. Phospholipid biomass concentration was not directly related to BOM removal by filters. Includes 35 references, tables, figures.

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Edition: Vol. 98 - No. 12 Published: 12/01/2006 Number of Pages: 13File Size: 1 file , 910 KB