Know-How

Our fields of activity

Our activities can be roughly divided into four areas:

  • Circulation treatment with ultrafiltration for pools
  • Water recycling in swimming pools and water works
  • Centralized and decentralized drinking water treatment
  • Process  water treatment in industry
Ultrafiltration
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Details:


Advantages of UF preparation plants:

  • Sterility 
    The biggest advantage of ultrafiltration is the sterility.
    The water leaves the membrane absolutely virus- and bacteria-free. The membrane cleans and disinfects itself several times a day automatically. With this technology filter contamination is impossible.
  • Flushing
    An ultrafiltration unit is flushed automatically at regular intervals for a period of less than a minute. This eliminates labor costs.
  • Compact design 
    Common ceiling heights of 2.2 m (7.3 ft.) are completely sufficient for the installation of a UF system. Ceiling heights of 4.5 m (15 ft.) and more are a thing of the past.
  • Space saving
    By eliminating the conventional steel filters, the space required for the treatment plant halved. The previous stocking of backwash water reserves is not necessary any longer.

 

How it works:


How ultrafiltration works:

Ultrafiltration (UF) is comparable to filtering coffee, only much better, just ultra.

During ultrafiltration, the water to be filtered is forced under pressure through small plastic tubes which have an inner diameter of about 0.5 - 2 mm. The actual filters are the walls of these tubes, the pores of which are 0.01 microns small (for comparison, a human hair has a diameter of about 50 microns - this is the 5000-fold value). These walls (membranes) can retain dirt up to a certain size. Particles or contaminants, which are too large for the ultrafiltration membranes are rinsed out again at the end of the tube, while solutes (salts and organic solutes) can pass through the membranes of the filter tube.

However, the great advantage of ultrafiltration over conventional filtering methods is the absolute sterility of the filtered water. The pores of UF membranes are so small that bacteria and even viruses are held back by the UF membrane.

By combining many of these filter tubes in so-called “filter modules” the filter area becomes big enough to allow a flow of water in bigger dimensions. Depending on the application, these modules are of different sizes, thus allowing different filter performance. The use of multiple modules leads to performances in water treatment that virtually leaves nothing to be desired.

Reverse osmosis
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Principal of RO:


The reverse osmosis can only be broadly referred to as a filtration method, because the membrane is not porous, but semipermeable. This means that the membrane is not permeable to water as such, but can absorb water in its molecular structure. This in turn means that the resultant concentrate contains all the contaminants that are supplied through the raw water, while the permeate contains mainly water molecules.

Originally, the reverse osmosis is used for seawater and brackish water desalination, but it is also increasingly being used in the separation of purely organic mixtures.

The principle of reverse osmosis is shown in the figure below:

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How it works:


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Integrity test
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Integrity test – increased safety
by leak testing of the membranes

​The wet membranes are exposed to air pressure by the filtrate side. Due to the surface tension of the water the air cannot pass through the membranes. Damaged fibers can be detected by the drop in pressure. Each filtration street can be tested separately.

If the pressure values drop below the specified pressure values determined for new modules, this points towards a likely membrane defect.

By means of the transparent pipe section on the module it can be determined which module is affected.

After removing the module and detaching the end caps a visual control shows bubbles appearing at the leaking capillaries.

After mechanical sealing of both sides of the leaky capillaries, the module is leak-proof and again ready for operation without restrictions.