Dissolved Air Flotation Separator

Dissolved air flotation separator is a oil/water separator, which is used for the removal of suspended solids and emulsified oil from liquids. To remove the emulsified oil, the emulsion is first broken by the addition of chemicals. For this, the additional flash mixer and flocculation units are provided upstream of the dissolved air flotation tank. Flotation of solids is achieved by the introduction of millions of microscopic bubbles into the process water. This is attained by drawing a component of the effluent from the downstream end of the dissolved air flotation tank and pumping the recycled effluent and atmospheric air to an adequate pressure saturation vessel / retention tank. The recycled effluent gets saturated here at an increased pressure in the pressure tank. The air-saturated stream is then blended with raw wastewater in the dissolved air flotation tank. When the pressurized flow is restored to atmospheric pressure in the tank, millions of microscopic bubbles are released that attach themselves to the suspended particles in the flow and lift the particles to the surface for effective removal.

 

Components
The important components of a dissolved air flotation separator include -

 

A brief description of the some of the important components of a dissolved air flotation separator is given below

 

Dissolved Air Flotation Tank
Dissolved air flotation tanks are designed in both circular as well as rectangular tank configuration configurations. These tanks can be constructed in steel or concrete, which depends on the flow and size. Steel tanks are generally designed for smaller sizes. The rectangular dissolved air flotation tanks can be designed with either separate or integral mixing and flocculation units.

 

Oil Skimming Device
Oil skimming device is designed at the downstream end of the separator section for disposal and collection of the oil skimmed to the downstream end by the scraper and chain mechanism. The oil skimming devices, which are typically employed for this purpose are the rotatable pipe skimmer, rotary drum skimmer and the floating oil skimmer.

 

Mixing & Flocculation Units
The devices that are generally provided for the mixing and flocculation units include the agitators (mixing unit) and flocculators (flocculation units). The agitators for mixing units are typically vertical motor driven agitator units, which are provided with high efficiency propellers. The flocculators designed for flocculation units are motor driven and can be either vertical or horizontal paddle wheel type depending on the configuration of tank.

 

Features and Benefits
Some important features and benefits of the modern day dissolved air flotation separators is given below -

Tags:- Air Flotation Separator Equipment, Dissolved Air Flotation Separator Machine

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