How mixed action filters work

Mixed filters carry the function of removing hydrated salts from the treated water. Such plants have their own filter, a valve system for resetting flows and a scheme for preparing, dispensing and storing regeneration solutions. Mixed-effect filters (FSD) can be regenerable and non-regenerable. The first type has a fundamentally different design and external regeneration. The second relates to bulk type filters and does not have a control unit.

How do FSD work


FSD carry out pressure filtration of water through a layer of granular material. In this quality is a mixture of anion exchange resin and cation resin. At the same time, the grain size of the cation exchanger should be larger so that during the loosening operation and the subsequent decrease in water pressure, the cation exchanger precipitates and the anion exchanger layer is located on top. A feature of mixed-use filters is the use of both resins in the same package.As a result, such a load can work as an infinite number of cation and anion resin micro installations that perform their functions sequentially.
The design of the FSD includes distribution devices for water supply and regeneration solutions, a drainage system and an intermediate collector. Compressed air is supplied to the bottom of the installation, which promotes mixing of ion exchangers after regeneration. In the recovery process, the acid solution enters through the lower drainage device and is discharged through the intermediate collector. To prevent it from entering the anion exchange resin, desalted water is passed through it from top to bottom, which is also discharged through an intermediate distribution system.

How is laundering boot layer


The cation exchanger is washed with an acid solution with simultaneous recovery of the anion exchanger. In this case, the alkali solution enters the upper distribution section, which is located above the layer of anion exchange resin, and is discharged through an intermediate distribution system. The desalinated water intended for washing the cation exchanger is supplied in the same way as the acid solution from bottom to top.Then it is the turn of the anion exchanger - it is washed, the ions in the filter are mixed and finally released from the products of regeneration. For the implementation of the restoration procedure, the granular layer is hydraulically divided into more dense (cation) and lighter (anion) materials.
These resins are regenerated separately: the first - with sodium hydroxide solution, and the second - with hydrochloric acid solution. After regeneration, the layers are cleaned and mixed again with compressed air.


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