The pressure flotation process is the most widely used DAF technique. High pressure water is saturated with air. This pressurized water forms small bubbles when injected into water at atmospheric pressure. Three types of pressurization processes can be used in DAF: full flow, partial flow and recycle flow pressurization. The entire inlet stream is pressurized in full flow pressure DAF. It is commonly used when the wastewater contains large amounts of suspended solids and the pressurization process does not affect the treatment efficiency of the system. Partial flow pressurization is used where the wastewater contains moderate to low concentrations of suspended solids. In the recycle flow pressurization system, 10-25% of the clarified effluent is recycled through a pressure vessel to the flotation tank. The flocculation process in not disturbed in the recycle flow system because of intense mixing and pressurization as clear water is pumped. A recycle flow system is cost-efficient because it pressurizes only part of the water, thus requiring less compressor power. Recycle flow pressure flotation is the best-suited system for most DAF applications.

DAF is an effective alternative to sedimentation. The advantages and disadvantage of DAF relative to sedimentation are as follows:

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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