PWL-Series Open Tank Dissolved Air Flotation System (DAF Wastewater Systems)
Dissolved air flotation (DAF) is a proven and effective physical/chemical technology to treat industrial and municipal wastewater streams. A dissolved air flotation system is used to effectively remove suspended solids such as TSS, FOG, BOD, COD and other pollutants from wastewater. Conceptually, the DAF wastewater process is simple – tiny bubbles attach to solid contaminants causing them to float and then sludge is skimmed off the surface of the water! DAFs are commonly used to treat wastewater in a variety of industries including Food & Beverage Processing, General Manufacturing, Oil & Gas and many more!
JWC Environmental’s FRC PWL Open Tank Dissolved Air Flotation system is optimized for treating wastewater heavily loaded with solids that require significant amounts of free surface area for flotation and separation. The PWL is an open tank with low-built separators, meaning the tanks are only built as high as 8 to 10 ½ feet tall. PWL units are rectangular in shape and built wider and longer as the free separation area requirement increases.
Open Flotation Cell & Counter-Current Skimmer
In the FRC PWL DAF systems, wastewater is introduced into the DAF tank and processed in a flow-through manner – wastewater comes in one side and goes out the other. While many DAF wastewater system designs push sludge across the entire length of the tank in the same direction as the wastewater flow, JWC Environmental’s PWL design uses a skimmer assembly that rotates against the the hydraulic flow of the water. This DAF wastewater design shortens sludge skimming distance and eliminates solids carry-over.
Sludge Dewatering Grid
The PWL Dissolved Air Flotation system employs the sludge Dewatering Grid, a rectangular array of steel plates that hold sludge in place as it thickens and self-dewaters. After reaching a level set by the operator, sludge is then skimmed for removal. The Dewatering Grid helps operators control sludge thickness, eliminates pre-mature removal of solids, reduces build-up and/or re-entrainment of sludge and generates drier sludge.
ANSI Recycle Pumps
Most DAF wastewater system manufacturers use specialty pumps to generate their whitewater. These pumps either draw atmospheric air or receive an inlet feed of compressed air into a chamber where multi-stage impellers or a regenerative turbine shears the air to form micro bubbles. While these pumps can generate decent whitewater, they are prone to corrosion, pitting, and poor performance in anything other than optimal operating conditions.
JWC takes an engineered approach with its FRC DAF aeration system. Our ANSI recirculation pumps are used for just that – recirculating water. They’re readily available from any pump vendor, have high tolerance for solids, can be made of high hardness materials, and are less expensive to own and operate compared to specialty whitewater pumps.
The JWC team knows that things happen in wastewater – sometimes without warning. Fortunately we are ready to support you with a plan. For your industrial wastewater needs we can provide DAF rental systems for to help bridge maintenance periods, emergencies or plant expansions. We have a fleet of FRC dissolved gas flotation, dissolved air flotation rental systems as well as belt filter presses that are ready to be deployed to your site. Learn more about DAF rentals here.
- Efficiently removes suspended solids and other pollutants from wastewater
- Eliminates pre-mature removal of solids
- Operator able to control sludge thickness
- Reduces sludge build up
- Generates drier sludge
- Flow Rates range from 20 to 1,020 gpm
- Free Surface Area ranges from 14 to 510 sq. ft.
- Tank Height ranges from 8 to 10.5 feet