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Language: English
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White Water and Filtrate Systems (Tissue) Series (Details)Includes 2 courses for $99/year. Tissue Library (Details)Includes 31 courses for $699/year.
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Training Time: 15 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English
Dissolved Air Flotation (DAF) systems are used to remove small suspended solids from fresh water, process water, and wastewater streams. Compressed air is injected into a pressurized recirculated stream to create tiny air bubbles that adhere to the suspended solids and float them to the surface. The "float" is then skimmed off and collected for reuse or disposal. The addition of coagulant and flocculant chemicals can enhance the flotation process and improve the efficiency of the DAF system.
At the end of this module, you will be able to:
The following key questions are answered in this module:
Where are dissolved air flotation (DAF) systems used?Common applications include clarification of municipal water and wastewater, and process water for tissue and papermaking operations.
What is done with the solids that are collected by a tissue machine DAF system? They can be collected for re-use in the process, or sewered.
Is there a particular order in which coagulants and flocculants should be added?Yes, coagulants should be added first, and then flocculants. The chemicals, addition rates, locations, and order should be carefully considered and jar tests can help determine the most effective process.
Where is the dissolved air added to the feed water to a flotation tank? Compressed air is typically injected into a recirculated and pressurized water stream, that is mixed with the feed water to the flotation tank.
What is the difference between large rectangular flotation tanks and tall circular ones? Rectangular units provide more retention time, while circular units use less space and can handle larger flows.
Below is a transcript of the video sample provided for this module:
DAF System Chemicals and Chemistry - Tissue
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