Method of reusing h-cationite filter regenerates

FIELD: water-supply engineering.

SUBSTANCE: invention relates to methods of removing hardness salts from regenerates and can be used in water treatment processes in heat-and-power engineering, chemical, petrochemical, food, and other industries provided with ion-exchange water-desalting filters. Method is accomplished by precipitation of hardness salts involving recycle of precipitate treated by alkali solution followed by passage of supernatant through H-cationite filter. Treated precipitate accumulated in preceding settling cycles is recycled into regenerate and settling-subjected solution is passed through cationite filter to produce purified sulfuric acid further used for regeneration of H-cationite filters in water-treatment cycle. Precipitate is treated with alkaline regenerate from OH-anionite filters or with alkali solution obtained from electrolysis of regenerates with pH not below 11. Amount of regenerate introduced into accumulator-settler should be at least 20 kg/m3.

EFFECT: excluded liming procedure, preserved initial (after regeneration of filters) content of sulfate ions in sulfuric acid, reduced consumption thereof during preparation of regeneration solution, and excluded discharge of sulfate ions unto water objects.

3 cl, 2 ex

 

The invention relates to a method of extraction from alignment hardness salts and can be used for water treatment in power, chemical, petrochemical, food and other industries, with ion-exchange filters water desalination.

A known method of removing hardness salts from solutions by liming. Obtained after purification solution is passed through the hydrogen-cationite filter and the output of the filter solution is directed to a stage of regeneration cationite filters (A.S. No. 1225821, C 02 F 1/42). The disadvantage of this method is the use of lime for softening solution, which reduces the sulfate content of the solution and increases the amount of calcium ions. In addition, the necessary additional costs of purchasing and transporting lime and construction reagent.

The purpose of the invention is the exception for the use of lime or other chemical agent at the stage of softening of the regenerate, the cost of recycling process of the regenerate.

This objective is achieved in that formed when defending regenerate residue containing salts of rigidity, is treated in alkaline regenerate IT - anionite filters or alkaline solution obtained by electrolysis of alignment, and recycle, and the supernatant liquid making its way to the cabins through H-cationite filter. Coming from the filter the acid solution is directed to a stage of regeneration of H-cationite filter.

The method of disposal of the regenerate is the following. Reclaim is collected in the storage-tank, there also return the previously formed precipitate. Sediment release from a storage tank into the reactor-clarifier and is mixed with the alkaline regenerate IT-anionite filter or with an alkaline solution obtained by electrolysis regenerates, defend and recycle in the storage-tank. After precipitation of hardness salts supernatant is passed through H-cationite filter. Obtained by filtering the acid solution with a concentration of SO

2-
4
600 mEq/l direct to the stage of regeneration of H-cationite filter.

Example 1. Reclaim with a total hardness of 140 mEq/l with a content of ions (mEq/l): CA2+- 60, Mg2+- 80, SO

2-
4
- 600, collected in the storage-tank, which was filed treated alkaline regenerate IT-anionite filter previously formed in the drive-clarifier sludge. Sludge from the storage tank decantation react in the p-sump, has filled in alkaline regenerate with pH=12. Settled sludge with a solids content of 20 kg/m3filed in the storage-tank. Total hardness of the solution decreased from 140 to 73 mEq/l Fluid pass through H-cationite filter. The purified sulfuric acid solution with a concentration of SO
2-
4
600 mEq/l was sent to the stage of regeneration of H-cationite filter. The rigidity of the resulting solution was 0.2 mEq/L.

Example 2. Reclaim overall rigidity 98 mEq/l with a content of ions (mEq/l): CA2+- 56, Mg2+- 42, SO

2-
4
- 636, gathered in the drive-sump, recycled treated sludge with a solids content of 25 kg/m3. Sludge treatment was performed with an alkaline solution obtained by electrolysis of alignment. Total hardness decreased to 48 mEq/L. the resulting liquid was passed through the H-cationite filter. The purified sulfuric acid solution had a content of sulfate ions 630 mEq/l, with the magnitude of stiffness, equal to 0.2 mEq/L.

The proposed method eliminates liming, allows you to save the content of sulfate ions in RA the creation of sulfuric acid to 600 mEq/l against 35-45 mg-EQ/l in the known method and, accordingly, to reduce the consumption of sulfuric acid in the preparation of regenerating solution. The method allows to reduce the cost of the recycling process regenerate.

1. The method of disposal of the regenerated H-cationite filters, including the precipitation of hardness salts, followed by cation exchange of the supernatant liquid, characterized in that, when advocating regenerate it recycle the treated sludge accumulated from previous cycles defend, and defend the solution is passed through cationite filter to obtain a purified sulfuric acid used for regeneration of H-cationite filters water cycle.

2. The method according to claim 1, characterized in that the sludge treatment is conducted with an alkaline regenerate IT-anionite filters or alkaline solution obtained by electrolysis of alignment with the pH value of not less than 11.

3. The method according to claim 1, characterized in that the quantity of sediment supplied to the drive-sump, should be not less than 20 kg/m3.



 

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