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Ultrafiltration units

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Ultrafiltration units

PURPOSE

Ultrafiltration units are used for clarification of water from suspended and colloid impurities, microorganisms and organic matters in the drinking and technical water supply system.

TECHNOLOGICAL PROCESS SCHEME


TECHNOLOGICAL PROCESS DESCRIPTION

The ultrafiltration process is based on passing primary water through a membrane under pressure.

The work of ultrafiltration units consists of recurrent filtration stages for 20–60 minutes and infiltrates back flushing for 20–90 seconds, forming the filtration cycle. The duration of filtration cycle depends on the quality of the water supply source.

During the filtration stage, primary water is supplied to the ultrafiltration module using a pump. Before the module, water is passed through the mud collector, which filtrates coarse particles preserving membranes. Coagulant (to improve filtration and back flushing efficiency) can be batched into the primary water supply line. The water flux goes through ultrafiltration membranes and comes to filtrate/back flushing container. Filtration is performed in a blind regime. It means that, during filtration, impurities are accumulated on the membrane surface.

Membranes are periodically back flushed when all accumulated impurities on the surface are eliminated. As the result of the inevitable adsorption process, the characteristics of the ultrafiltration unit after back flushing are not fully restored. That's why periodically it is necessary to use another type of flushing — chemical (using reagents).

Chemical flushing is performed with frequencies of 2 times per day to 1 time per week, depending on the quality of clarified water. In average flushing, the frequency is 1 time per day.

Chemical flushing furthers the elimination of adsorbed organic and inorganic compounds which are impossible to eliminate during usual back water flushing. Chemically enforced flushing is divided into two parts: flushing with alkaline and disinfectant solution for the efficient elimination of biofilm from the surface of membrane modules and also flushing with acid solution for elimination of inorganic carbonate compounds. All solutions for chemical flushing are prepared by reagent batching into flushing water flux. After batching is finished, modules are got wet in solution for several minutes. The getting wet process is finished with obligatory washing from cleaning solution. Afterwards, a block of UV-models can be included in the filtration regime.

Dry air is used to check membrane integrity.

For more information about the operating principles of ultrafiltration units, see the video.

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Features:
  • Fine clarification of surface waters with minimum reagent consumption
  • High quality of clarified water
  • Full computer-aided automation of process
  • Low operational costs
  • Possibility of held impurities output in the form of solid slug