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Dissolved Air Floatation (DAF) clarification has long been used to remove heavy oil and grease, suspended solids and BOD loads in industrial baking and food processing wastewater. Liquid waste and wastewater is generated from cleaning and clean-in-place operations and, sometimes, from bad batches. Often pH adjustment and/or chemical pretreatment is required in order to break oil and grease emulsions. This pretreatment strategy results in a sludge, which, depending on the chemical pretreatment regime can be a significant fraction of the total wastewater stream. A high degree of operator attention is frequently required to adjust chemical dosing to meet pretreatment objectives due to inherently varying waste streams. DAF is an effective and proven pretreatment technology but the costs and labor associated with chemical conditioning of the feed and sludge management offer opportunities for improvement.

Document Type: Research Article


Publication date: 2004-01-01

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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