Lecture 6 - Flotation PIERO M ARMENANTE NJIT Flotation...

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P IERO M. A RMENANTE NJIT Flotation
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P IERO M. A RMENANTE NJIT Flotation Flotation is a separation process based on the use of very fine gas bubbles that attach themselves to the solid particles in suspension to make them buoyant and drive them toward the free surface of the liquid Air is the only flotation agent used in wastewater treatment Flotation is especially useful to separate very small particles or light particles with low settling velocities. In such cases more complete and rapid separation can be obtained with flotation than with sedimentation
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P IERO M. A RMENANTE NJIT Chemical Additives to Enhance Flotation Processes Chemical additives that promote the attachment or entrapment of air bubbles to solid particles or flocs can be effectively used to enhance flotation Flotation additives include: - aluminum and ferric salts - activated silica - organic polymers
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