The general standard for selecting ion exchange resins is to choose resins with high exchange capacity, easy regeneration, and durability. Overall:

(1) Exchange capacity is a key indicator of the characteristics of ion exchange resin. The larger the exchange capacity, the more positive ions a resin of the same volume can adsorb, and the larger the water production flow rate for one exchange cycle time. Generally speaking, weakly acidic or weakly alkaline resins have a larger exchange capacity than strongly alkaline resins. In addition, in similar resins, the exchange capacity varies due to the different chemical crosslinking degrees of the resin. Generally, resins with high chemical crosslinking degree have a large exchange capacity; Resin with high chemical cross-linking has a high exchange capacity. Therefore, it is important to pay attention when choosing resins.

(2) Resin selection should be based on the characteristic of removing cations from the raw water. If only positive ions with weak adsorption capacity must be removed from the water, it is necessary to use strong acidic or strong alkaline resins.

(3) Resin selection should be based on the regulations of the effluent water body. If only a partial desalination system software is required, strong alkaline cation resin and weak alkaline anion resin can be used in combination for application. For pure water or industrial pure water system software that requires thorough desalination, it is necessary to choose strong acid-base cation exchange resins with strong adsorption capacity and strong alkaline cation exchange resins to be used in combination to remove difficult to adsorb cations.

(4) Resin selection should be based on the composition of residues in the raw water. If there are many organic compounds in the raw water, or if the removal of positive ions is significant, a resin with a larger diameter of chemically cross-linked mesh should be used. Choose high toughness porous structural resins as much as possible.

(5) The resin used for mixing beds is mostly composed of strong alkali strong alkaline resins. However, it should be considered that the regeneration of resin in the mixing bed is very easy, so the difference in wet true density between the two resins should be larger, generally not less than 15%~20%. In addition, it is also necessary to fully consider the situation where the exchange water flow rate is relatively high and the resin is severely worn during the operation of the mixed bed, so a resin with wear-resistant performance should be selected.

(6) The selection of resin should be based on the desalination water processing technology regulations, such as using a dual chamber bed, where strong and weak resins are used in combination. Due to the easy regeneration of weak resins, the quality requirements for regenerants are also relatively low. The regenerated liquid from strong resins can be used to regenerate weak resins, resulting in low consumption of regenerants and low water treatment costs.

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