The Technology


KWI works with long time experts in design and production departments. We focus on stainless steel production at a high-quality level. In our manufacturing facilities and product engineering group in Klagenfurt, Austria, all fabrication and production systems are performed strictly in accordance with ISO 9001 and ISO 14001 quality standards. Intimate cooperation between R & D, product engineering and fabrication ensures continuous improvements in product function and cost.


Our mission is to provide the best engineered and cost effective solutions for our customers in the field of liquid/solid separation, using DAF as the main process. As such, constant innovation, research and development are our top priorities. The research and development team works side by side with our marketing and manufacturing team for continuous innovation.

Technology – first

Our research & development is continuous



Flotation technology is the best practice for separating specific light weight substances (e.g., oils and fats, turbid and suspended matter, algae) from aqueous solutions. The process in a flotation plant can essentially be subdivided into the following three sections:

  1. Chemical pretreatment by coagulation and flocculation

In the first process step, the medium is pretreated, with the substances to be separated forming into larger aggregates. As a result, the deposition of fine air bubbles is made possible or improved. The selection and dosage of suitable chemicals depends on the process and is, according to the application, crucial for the removal rates of the DAF.

  1. Whitewater production

KWI’s patented technology (Air Dissolving Reactor, ADR), a specially designed reactor, saturates some of the clearwater with air under pressure and then depressurizes it across a valve. Fine air bubbles, so called micro bubbles with a diameter of 40 to 90 micrometers, are formed.

  1. Mixing zone and flotation tank:

In the third section, a specific mixing of the whitewater with the medium proceeds, followed by the separation in the flotation tank. The microbubbles dispersed in the whitewater deposit on the particles to be separated. It creates bubble-particle compounds whose resulting density is lower than that of the surrounding medium. As a result, these compounds rise to the surface and form flotation sludge, which is skimmed off via a clearing mechanism. The clearwater leaves the flotation tank through appropriate outlets and is purified for subsequent processes.

Smart DAF

KWI is constantly working on product development. In addition to constant expansions of the product range, we are working on the intelligence of our DAF units. In a smart world, also DAF systems can be smart. Installed sensors enable real-time performance data to be captured. Using sensors on the water inlet and water outlet enables monitoring of water characteristics. Subsequently, these data may be used for adjustments, e.g. for optimizing the use of chemicals.

Intelligent data management systems enable more than monitoring the process. Overall purpose of smart DAFs is to support ecological and economic efficiency goals.