Membrane processes

Providing clean drinking water is not always a simple matter. In many countries, precipitation is not nearly sufficient to meet the whole demand. Ultra- and nano-filtration processes and reverse osmosis are becoming more important across the globe, as they make it possible to acquire large amounts of fresh water from lakes and oceans.

In reverse osmosis, a partially permeable membrane with pore sizes in the molecular range concentrates impurities and dissolved salts on one side, and gathers pure water on the other side. The process is very efficient, even in saline brackish water and contaminated water with basic pre-filtration. These facilities offer a valuable contribution to drinking-water supplies. As initial investment costs are high, it is particularly important that costs for maintenance, cleaning and downtime are avoided.


It is important that the membranes last a long time and work at full capacity. However, as soon as they are installed, waterborne substances gradually begin to clog them … more

Dispersing and anti-fouling

Dirt and suspended particles also pose problems to the partially permeable membrane. They build up and form an obstructive layer, which massively reduces the efficiency … more

Preventing contamination

Dirt and suspended particles that have formed a layer on the membrane wall offer an ideal breeding ground for bacteria, which is damaging for the membrane.… more