Filtration technology by WABAG – for water and wastewater treatment
Water filtration for drinking and process water
Water is the most important source of nutrition on the planet. Therefore, drinking water must meet stringent requirements with regard to quality, purity and hygiene. Filtration is an essential process in water treatment. It is frequently the case that it either reprsents the main processing phase, or is integrated into multi-barrier systems. Many membrane filtration plants also include conventional filters for pre- or post-treatment. Accordingly, the further development of filtration technology has always been a major WABAG goal and the object of ongoing optimisation and improvement. Proven filter design provides ideal solutions for both single- and multilayer filters based on various unique features.
Wastewater filtration for tertiary treatment and water reuse
Wastewater filtration is necessary when discharge limits are particularly stringent, e.g. in sensitive areas. In additiion, wastewater filtration in combination with disinfection also offers a reliable and economic solution for water reuse. WABAG’s filtration technology derives from its experience with water filtration, which has been acquired since the late 1970’s. It incorporates all the ncessary know-how about the particular factors related to wastewater filtration such as the biological activity in the filter bed and control of filter operation with flow variations. Like water filters, wastewater filters are realised as single- and multilayer filters and offer the same features.
Optimised technology – the WABAG filtration system
The WABAG filitration system is utilised in many modern filtration plants and as a rule, is installed in open or closed type concrete filters. The filter floor is the system’s core component. A simple and cost effective design is vital, along with an even distribution of the backwash media and maximum operating safety.
The drainage system consists of pipes arranged at right angles to the filter’s longitudinal axis and fix-mounted parallel to the filter bottom. The appropriate orifices in the individual drainage pipes enable the passage of the filtrate, the scouring air and backwash water into the filter material. During backwashing, air and water are introduced into the culvert below the filter bottom and into the drainage pipes via a distribution battery. This longitudinal and lateral pipe system ensures excellent backwash media distribution across the whole filter area.
WABAG has installed the drainage system in a number of plants in various countries. Great operational reliability, minimised clogging danger and high backwashing efficiency, together with easy and rapid assembly, have ensured long-term customer satisfaction.
- Zürich Werdhölzli WWTP (Switzerland)
Wastewater treatment, 670,000 PE
- Höfe WWTP, Freienbach (Switzerland)
Wastewater treatment, 45,000 PE
- Hongkong, Tai Po WTP (China)
Water treatment, 400,000 m3/d
- Zurich-Hardhof WTP (Switzerland)
Water treatment, 100,000 m3/d
- Ningguo WTP (China)
Water treatment, 50,000 m3/d
- Chirita WTP (Romania)
Water treatment, 99,360 m3/d