INTEGRATED DISSOLVED AIR FLOATATION SYSTEM AND PROCESS FOR THE TREATMENT OF WASTEWATER

摘要

This disclosure relates to a method, process, and apparatus for the treatment of water. For example, the present methods are useful for the treatment of water containing emulsified lipids, having alkaline pH, and/or wastewater at high temperature. An embodiment of the present method comprises placing water containing fat, oil or grease (FOG) residue in a treatment vessel; adding a coagulant to the water; adding a flocculent to the water; introducing air bubbles generated using an air flow of about 400 to about 800 mL of air / min per L of water and membrane diffusers with pore size ranged from about 1 to about 2.5 mm for a time period sufficient to cause coagulation of at least part of the FOG residue; introducing air bubbles generated using an air flow of about 40 to about 80 mL of air /min per L of water and membrane diffusers with pore size ranged from about 1 to about 2.5 mm for a time period sufficient to cause flocculation of at least part of the FOG residue, forming floes; introducing microbubbles with size ranged from about 20 to about 100 μπι for a time period sufficient to cause the floatation of at least part of the floes; and removing at least a part of the floes from the wastewater.