SU990686A1 - Method for softening water - Google Patents

Description

(54) METHOD OF IMPROVING WATER

The invention relates to the reduction of water by sodium cationization, including the treatment of regeneration water, and can be used in heat and power, ferrous metallurgy and other industries in the preparation of feedwater for drum boilers and heat networks. There is a known method of water softening, according to which the source water, together with the regeneration solution of sodium-cation-exchange filters, is treated with soda and lime, then is passed through the sodium-cation-exchange filters in the clarifier. Part of the deeply humidified water is used to feed the heat network, and the rest is evaporated in evaporators, the sodium-cation exchanger is regenerated with purge water. However, the mixing of wastewater sodium cation-exchange filters with the source water does not preclude the discharge of effluent, but disperses them in heat networks. In addition, the use of this method | to soften water that does not require pre-clarification (plumbing, artesian, etc.), leads to a significant increase in capital expenditures due to the need to build clarifiers of high productivity. The closest to the invention to the technical essence is a method of water softening with salt utilization, according to which sodium-cation-exchange filters are regenerated with a solution of chlorine sodium, and the regeneration water of sodium-cation-exchange filters is evaporated in evaporators, the bottoms of which are treated with lime to precipitate magnesium hydroxide , then the three-component NaCl system is concentrated — with crystallization and separation of NaCl and obtaining CaCfc in the form of a solution or melt 21. The disadvantage of the known method is high feed capacity due to

39906864

the need for a deep evaporation of the regeneration solution during obdrakov and the use of expensive and acute salt consumption for regeneration

scarce stainless steels, in st -2.3 g / eq is 1.8 l. The volume of an otz with extremely high aggressive-washing water is equal 6 l. Volume of waste

Calcium chloride and wastewater solutes collected in a tank are 7.8 liters. Evaporation drains The purpose of the invention is to create a bes-over vacuum at A, 3 times,

a sewage purification scheme and an increase in the amount of 6 l of distillate and

reliability and efficiency of the process pu-1.8 l of brine. Salt concentration

reducing the aggressiveness of the regeneration-sternness in brine is

vodal water. 527 mEq / l, and the sum of anions N0

The goal is achieved by + mEq / L. The brine is subjected to water softening, including co-calcination, and in abatement-cationation, regeneration, excessive alkalinity, the dose of isthionite is carried out with a solution of salts of nitrogen, 15 are taken by 3 mEq / l less magnesium and sodium nitrate, and peony hardness , and the dose of soda for processing and reuse of 6 mEq / l is less than the total hardness of the regeneration water formed. The mummy brine of 1.8 l with the volume and the regeneration water starts the following ionic composition, mEq / l: evaporated to a concentration walkie-talkies required 20 ° C (.. (. ,, 0; CA / ig-3.0; my for regeneration, and then under-C-Q 1.0; p. 122L. Brine is used for reagent softening and after the next regeneration of the cationic separation of calcium and magnet compounds. The distillate obtained by evaporation directs to regeneration. The effluent is used as

Preferably the regeneration lead 25waste water.

a solution containing 80-90 g / kg nitrogen; Comparative indicators of corrosive sodium and 10-20 g / kg of nitrogen resistance of St 20 in regeneration

Toxic sodium. Solutions for the known and proposed methods are given in the table.

PRI me R. In sodium cation exchanger, the proposed method provides a filter loaded with cation exchanger KU-2 compared to the known reduction in volume of 1 dm, reducing the initial in-corrosion rate of Art. 20 16-22 times a day, having the following ionic composition, and allowing its use instead of meq / l:, 0; Sdd-g2,0; С 1.0; expensive nickel-containing when building WATER C (; g 1,0;, 3.0. JjIIin drainless water-heating

Water is supplied to the consumer.

Claims (2)

After depletion of the ion charge, in addition, the capital cost of its rigidity is regenerated with a solution, reduced by the absence of deep-containing 80-90 g / kg NaNO-, and the 10th concentration of effluent and crystalline 20 g / kg NaNOa. The volume of spent salt disposal. Invention Formula -. 1. A method of water softening, including sodium cationization, regeneration of cation exchanger, recycling and reuse of regenerated wastewater formed, characterized in that, in order to create a drainless circuit, to clean and increase the reliability and efficiency of the process by reducing the aggressiveness of regeneration water, regeneration the cation exchanger is treated with a solution of salts of nitric acid and sodium nitrate, and the regeneration water is first evaporated to the concentration necessary for regeneration, and then subjected to reagent After the separation of calcium and magnesium compounds, the filtering is released to the regeneration. 2. A method according to claim 1, characterized in that the regeneration is carried out with a solution containing 80-90 g / kg sodium nitrate and 10-20 g / kg sodium nitrate,. . Sources of information taken into account in the examination 1. USSR author's certificate If 710963, cl. C 02 F 5/02, 1E80. 2. Reznikov Yu.N. Thermal desalting of wastewater chemical water treatment with the disposal of salts. Abstracts of the reports of the All-Union Scientific and Technical Conference Thermal methods of water treatment at thermal power plants and the tasks of scientific research, Chel Binsk, J977. with. 58-59.