Dissolved Air Flotation (DAF) is a physio-chemical process of solid and liquid separation. It is popularly used in the pre-treatment or primary stage of a waste water treatment plant to initiate suspended solids removal in the system. We have also achieved success with using our DAF as a secondary clarifier to reduce properties such as colour and turbidity.
The system involves the KEL DAF main tank, KEL Air Dissolving Tube (ADT), chemical dosing system, recirculation pump and an air compressor. Our DAFs are constructed in a fully metallic structure (Stainless Steel 304 or 316 grade)
KEL DAF systems are designed to handle high total suspended solids (TSS) and Fats Oils and Grease (FOG) loading. We can treat a range of water flow rates starting as low as 5 m3/hr going up to over 1000 m3/hr with a single DAF unit. This is also done with the help of flocculants and coagulants which are to be dosed as per the rate and quantity mentioned by our engineers for optimal results. We additionally also offer completely automated chemical dosing systems with agitators. Additionally, KEL DAF’s do not need pipe flocculators since we use inline dosing methods, however, if the client specifically requires it, we do design and manufacture them as well.
The application of Dissolved Air Flotation is to separate solids from liquid, such as suspended solids, oils, fats and grease with the help of micro bubbles. These bubbles formed in the KEL ADT attach themselves to light weight solid particles and rise to the surface of the DAF main tank. These solid particles then form a top layer of scum which are either scrapped by blades and removed from the top by a paddle wheel, in the case of our MRLP DAFs, or scooped out and removed by our scoop in the case of our MC DAFs.