Baldwin offers its customers a unique and efficient way to separate liquids from solids through its dissolved air flotation separation process unit. The process and unit are particularly suited to wastewater treatment needs.
During the dissolved air flotation separation process, microscopic air bubbles (10-100μ) become attached to solid particles suspended in the liquid, causing the solid particles to float. This allows for the easy separation and removal of the solid particles from the liquid content in the substance.
Overview of how the dissolved air flotation separation process works:
- high pressure is applied - air is usually dissolved into the liquid content when placed under pressure (dissolved air remains in the solution until pressure is released into atmospheric pressure)
- once air is released, the air will come out of the solution in the form of microscopic air bubbles
- bubbles are then mixed with the wastewater and become attached to the solids in the waste stream causing the air solids agglomerates to float to the liquid surface where a solids float blanket is formed
- surface skimmers then remove the float blanket, leaving the liquid clear of solids
- process is efficient - providing air dissolving efficiency of approximately 80%
- non-clogging spray cone inside the unit ensures excellent air/liquid contact and in turn helps create a high mass transfer and reduced recycle rates
- air release system is designed for high efficiency and to maximise (greater than 95%) the conversion of air into bubbles appropriately sized for flotation (10 - 100μ)
- optimum mixing and bonding for the air bubbles, solids and polymers is enhanced by the units swirl inducing mixing chamber