SU644522A1 - Method of regenerating sodium-cationate filters - Google Patents

Description

The invention relates to a method of regeneration and can be used in water treatment with water softening using cation exchangers.

Nowadays, in many parts of the industry, water curing by Na cationization is widely used. Its essence consists in passing the softened water through a filter loaded with cationite (sulfonic or KU-2), which exchanges Na + cations for Ca + and Mg + 2 cations dissolved in water.

There is a known method of regeneration of the spent cation exchanger in the process of clearing, which consists in passing a b -8% solution of sodium chloride through the cation exchangers. In the process of regeneration by this method, reverse ion exchange takes place, i.e., the Na + cations contained in the salt are exchanged for the Ca + and Mg + cations contained in the cation exchanger.

The disadvantages of this method are the high consumption of table salt for regeneration (the consumption of table salt is up to 50% of the cost of raw water).

There is a method of regeneration of cation-exchange filters using industrial boiler water. However, although according to a known method, a solution of sodium chloride is prepared on the purge water of the boilers, this efficiency of the recovery process does not affect the implementation of regeneration.

The closest to the invention to the technical essence and the achieved result is the method of regeneration of Na-cationite filters, which consists in passing seawater containing salt (8% solution in terms of salt) at a rate of 4 w / h.

However, according to a known method, during regeneration, 50% of the capacity of the cation exchanger is restored at a specific consumption of seawater (in terms of salt) 10 g equivalent to the same absorption capacity of the cation exchanger.

The disadvantages of this method are the deterioration of technological indicators of intelligence. Thus, the absorption capacity of the cation exchanger is halved, and for waters of increased salinity there is a sharp increase in the residual hardness of the softened water. And since seawater is a relatively dilute salt solution, the extra cost is V13. electricity during regeneration.

To maintain the same performance under these conditions, an increase of

the number of filters is doubled, i.e. the maximum costs are reduced. Additional costs for electricity reduce the economic effect of a known method of regeneration.

The aim of the invention is to increase the degree of regeneration and cheaper process.

The goal is achieved by the described method of regeneration of Na-cation-exchange filters, through which a 9-10% solution (in terms of salt) containing salt and hardness salts is passed through these filters with a speed of 8-10.

In this case, as a solution containing salt. and. hardness salts, use the spent regeneration solution of a sea water softening plant containing Na-, Са + 2, Mg + С1и S0- | ..

Distinctive features of the method are passing a solution containing sodium salt and hardness salts through Na-cationite filters at a speed of 8–10 f / h; and as this solution, a used regeneration solution of a sea water softening plant, containing Na +, Ca + 2, Mg + 2, .Cl and SQ-j is used. mortar installation solution gcheni seawater.

644522

According to the proposed method, a 9-10% solution (in terms of salt) of the composition, mg eq / l: Ca + 50; Mg-b2 150; Cl, - 1200; Na + 1580; SQ580.

The filtration rate is maintained within the range of 8-10 m / h, which is due to the fact that at lower rates, gypsum may fall out in the thickness of the cationite, and at high speeds, the flow rate of the regeneration solution will increase.

The use of spent regeneration solution, released when 1 m of seawater is softened, is sufficient to soften 5 m of fresh water.

Example. Several filter cycles were conducted on a filter with a diameter of 34 mm with a height of cation exchanger (sulfonic coal) of 1050 mm. The regeneration is carried out with a 10% solution of a natural spent regeneration solution with a hardness of 200 mg eq / l with a solution transmission rate of 8-10 u / h.

Fresh water with a hardness of 5.6 mg eq / l and a salinity of 830 mg / l is supplied to the mind. The table shows the comparative data obtained during the regeneration of Ma-cation-1X filters by the proposed and known method.

As can be seen from the table, the spent regeneration solution of the installation of the sea water in a sea is 80 to 90% of the capacity of absorption of the cationite against 50% by a known method.

(At the same time, even the clearing of water with enhanced mineralization is ensured by the water; and the hardness of the mind is rich in water, dt, satisfying the nutritional requirements of evaporators.

Thus, the proposed method of regeneration provides the best quality of softened water with more than its quantity. BENEFITS: COSTS.

The implementation of the proposed method ORIGINATIVE Provides an opportunity to save only with one installation (500 rto fresh water), 3500 g of salt or 35000 rubles. in year.

Claims (3)

1. A method of regenerating Na-cationite filters by passing a solution containing sodium salt through the latter, characterized in that, in order to increase the degree of regeneration and reduction of the process, a solution containing 5 salt and hardness salts is passed through Na-cationite filters 8-10. 2. A method according to claim 1, characterized in that as a solution containing 5 table salt and hardness salts, use the spent regeneration solution, the creator of the seawater softening plant containing Na +, Ca +, C1 and SO. 3. The method according to paragraphs. 1 and 2, characterized in that they use 9-10% (in terms of table salt); spent regeneration solution of installation of sea water softener.