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Dissolved air float as treatment and clarification of effluent

The pulp and paper industries face the problem of being among the biggest environmental polluters. To change this image, they invest in constantly improving the treatment of their effluents. Since water is an essential component in this production system, a large amount of waste is also generated.
The dissolved air flotation process in water and effluent treatment is one of the most widely used alternatives by companies in this sector today. The main objective of flotation is to remove contaminants to increase the purity and appearance of the product.
This practice is efficient in removing suspended, liquid and colloidal particles, suspended solids, turbidity, color and total solids, in which the solids are retained by adhering to air bubbles.
The waste of water, containing fibers that can be reused, means a loss of raw material and money for the industry, since it increases the costs of acquiring material and disposing of the final residue in the environment, which could be reused.

What our client thought of the project

Reduced consumption of chemical products: with flotation, the consumption of coagulants and flocculants (typical of conventional decantation processes) is reduced by 20% to 40%;
Lower flocculation requirements: flocculation requirements are lower for the flotation process, being effective also as small flakes, making it easier and requiring less attention from the operator;
The start-up and shutdown of each module are extremely fast: due to the reduced volume of the flotation module and flocculation times and the fact that the flotation process itself occurs quickly, there is no maturation period, typical of conventional sedimentation;
More compact, i.e. smaller area occupied, reducing construction times and costs;
More dense and continuous sludge discharge: in the flotation system, the sludge is extracted from the surface, without clogging and without the need for cleaning. The sludge layer is visible, stable and has an automatic scraper;
Modular and easily expandable system;
Total absence of odors;
High tolerance to hydraulic and/or organic overloads.
Completely built with AISI 304/316 stainless steel;
Fully automated operation;
Completely assembled or pre-assembled units, quick installation and small civil works;
Temperature sensitivity: the retention time of the materials is much shorter than the decantation process, and the separation speed is around 10 times higher, being immune to temperature variations;
Water savings: the flotation process reduces water loss through discarded sludge and filter washing water.
Greater sludge concentration and ease of treatment: sludge, through flotation, has a concentration of 3% to 6%, that is, 10 times more concentrated or 10 times greater volume than sludge through decantation, dispensing with thickening.

Fast's dissolved air floater features the exclusive and most modern microbubble system on the market, as well as high-quality, durable materials. FAST floaters guarantee low operating costs.

The equipment is highly efficient in separating solid particles and is highly recommended for effluents that have a high concentration of light solids (easy to float), surfactants and other contaminants.

Dissolved air float as treatment and clarification of effluent

What our client thought of the project

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