The necessity of water softening equipment

2021-12-13

Why use softened water equipment?
The soaping agent commonly used in the pretreatment of printing and dyeing will produce insoluble calcium-magnesium soap precipitation when encountering calcium and magnesium ions, which will cause stains on the surface of the fabric, and also cause the waste of soaping agent; in the bleaching process, iron and manganese in hard water The presence of ions is easy to cause the fabric to produce macula, which directly affects the whiteness of the fabric. Due to the catalytic effect of iron and manganese ions in the macula, it will also make the fibers of the fabric brittle, so water softening equipment is required.


Work flow of softened water equipment

01 .running
Under a certain pressure and flow rate, the raw water enters the container (resin tank) filled with ion exchange resin through the valve cavity of the controller. The Na+ contained in the resin is exchanged with the cations in the water to make the Ca2+ and Mg2+ ion content of the water out of the container. Meet the established requirements and realize the softening of hard water.

02.Backwash
After the resin expires, before regeneration, backwash it with water from the bottom up. There are two purposes of backwashing. One is to loosen the compressed resin layer during operation through backwashing, which is conducive to the full contact of resin particles with the regenerating solution; the other is to make the suspended solids and broken resin accumulated on the surface of the resin follow the backwash water. Discharge, so that the water flow resistance of the exchanger will not become larger and larger.

03.Salt absorption regeneration + replacement
The salt solution for regeneration flows through the failed resin layer at a certain concentration and flow rate to restore the original exchange capacity.
After the regeneration liquid has been fed, there is still salt solution in the exchanger that has not participated in the regeneration exchange. Use clean water less than or equal to the flow rate of the regeneration solution for cleaning (slow cleaning) to make full use of the regeneration effect of the salt solution and reduce the positive washing load.

04. positive washing + regenerant tank water injection
The purpose of the positive washing is to remove the regenerated waste liquid remaining in the resin layer, and it is usually washed at a normal flow rate until the effluent is qualified.
Then inject the amount of salt water required for the solution to regenerate once into the regenerant tank.


The treated demineralized water can increase the toughness of the fabric, improve the feel and smoothness of the fabric, increase the life of the textile equipment, prevent the equipment from being blocked by the sediment formed by calcium and magnesium ions, and reduce the maintenance cost of the equipment.