RU2310612C2 - Method of purification of the washing alkaline solution of the bottle washing machines - Google Patents

Abstract

FIELD: distillery industry; soft drink industry; other industries; methods of purification of the washing alkaline solutions of the bottle washing machines.

SUBSTANCE: the invention is pertaining to the methods of purification of the washing alkaline solution of the bottle washing machines from the suspended particles, the carbonates, the aluminates and other impurities introduced in it at washing of the reusable bottles. The method provides for batching into the polluted washing solution of the spent regeneration solutions (SRS) of the ion-exchange Na-cationite screens or N-cationite screens containing the calcium chloride and the magnesium chloride with the subsequent clarification of the liquid. The volume of the batched reclaim is accepted of not less than 3 % from the volume of the purified washing solution. The method of the invention allows to raise duration of usage of the washing alkaline solution without deterioration of its washing characteristics, to restore the chloride-containing reclaims, and also to diminish the discharge of the pollutants and to reduce expenditures on buying of the chemical reactants for purification of the washing alkaline solution. The settlings and the tailings formed at purification of the washing solution are subjected to dehydration and utilization.

EFFECT: the invention allows to raise duration of usage of the washing alkaline solution without deterioration of its washing characteristics, to restore the chloride-containing reclaims, to diminish the discharge of the pollutants, to reduce expenditures on buying of the chemical reactants for purification of the washing alkaline solution, to dehydrate and utilize the settlings and the tailings formed at purification of the washing solution.

2 cl, 2 ex, 2 tbl

Description

The invention relates to methods for cleaning alkaline washing solution of bottle washing machines from suspended particles, carbonates, aluminates and other impurities introduced into it when washing returnable bottles.

Known methods of cleaning solutions from carbonates using calcium chloride, barium, etc. (Frog B.N., Levchenko A.P. Water treatment. / Textbook / Moscow: Moscow State University, 1996, p. 192.), As well as cleaning detergent a solution of bottle washing machines using a certain amount of precipitated and coagulated reagents (Kuntse V., Mit G. Technology of malt and beer. St. Petersburg: “Profession”, 2001, p. 546), including aluminum sulfate and quicklime (Henri Roulet Brewer's Handbook, Moscow, 1969, p. 157).

A disadvantage of the known methods is the need for the purchase of chemicals.

The purpose of the invention is the cleaning of the washing solution of bottle-washing machines from contaminants introduced into it when washing returnable bottles, ensuring the maintenance of the standard washing characteristics of the solution without the cost of purchasing chemicals and reducing the discharge of pollutants into the sewer system by disposing of spent regenerating solutions (ORP), increasing the period of use of the washing alkaline solution and the effective separation of precipitation.

This goal is achieved by the fact that ORP is dosed into the contaminated alkaline washing solution after regeneration of Na-, H-cation exchange filters of the softened water treatment plant (on which the initial washing solution is prepared) containing calcium and magnesium chlorides. As a result of the reaction, insoluble calcium carbonate (CaCO ₃ ) and magnesium hydroxide [Mg (OH) ₂ ] are formed, which contribute to the formation of large and dense flakes (especially in the presence of aluminum hydroxides in the contaminated washing solution), coarse impurities (cellulose fibers and other contaminants ), intensify the process of sedimentation and clarification of the liquid.

In the process of clarification, carbonates and other suspended solids are precipitated.

Example 1

In a contaminated washing alkaline solution of a bottle washing machine with a pH of 13.2 and a CO ₃ content _of ^2– = 27180 mg / l; HCO ₃ ^- = 5124 mg / l; Al ³⁺ = 60 mg / l; suspended solids = 320 mg / l dosed spent regenerating solution (ORP) of Na - cation exchange filters with a pH value of 5.1, a total hardness of 725 mEq / l and a Ca ²⁺ content of 12625 mg / l; Mg ²⁺ = 1155 mg / L.

The regenerate dose was varied from 1 to 95% of the volume of contaminated washing solution.

After mixing for 5 min, the solution was fed to a sump, where a precipitate formed, and the supernatant was passed through a sand filter.

Table 1 shows the results of cleaning a contaminated alkaline detergent solution.

Table 1 Dose of ORP,% The purified solution after the filter pH СО ₃ ^2- , mg / l decrease in CO ₃ ^2- ,% Al ³⁺ , mg / l decrease in Al ³⁺ ,% BB, mg / l BB reduction,% one 13,2 27020 0.58 60 no 289 9.6 3 13,2 25200 7.3 58.9 0.17 164 44.5 5 12,4 24000 11.6 58.2 3.0 85.0 74.0 10 12,2 21000 22.7 56.3 6.1 72.0 78.5 twenty 12,2 15,000 44.8 54.9 8.5 24.0 92.5 thirty 12,2 9000 66.8 54.0 9.0 10.0 97.0 fifty 11.8 3600 84.7 42,2 29.7 10.0 97.0 70 11,4 2400 91.2 38.3 36,2 3.0 99.0 95 8.5 120 99.5 2,3 96.2 3.0 99.0

Example 2

An spent regenerating solution of N-cation exchange filters with a pH value of 0.33 was dosed into a contaminated alkaline washing solution of a bottle-washing machine with a pH of 14.25 and a CO ₃ content _of ^2– = 35700 mg / l; total hardness 725 mEq / l; Ca ²⁺ = 11525 mg / L, Mg ²⁺ = 1824 mg / L.

The dose of the regenerate was changed from 3 to 50%.

After mixing, the solution was sedimented and filtered through quartz sand.

Table 2 shows the results of the cleaning of an alkaline washing solution using the spent regenerate of H-cation exchange filters.

table 2 Dose of ORP,% Purified solution CO ₃ ^2- decrease in CO ₃ ^2- ,% pH amount of sediment, g / l 3 32600 8.6 14.25 8 5 30900 13 14.25 12 10 26700 25 14.17 twenty twenty 21600 39 13.58 thirty thirty 8100 77 13.13 56 fifty 120 99 10.81 72

The proposed method for removing suspended particles, carbonates, aluminates and other contaminants introduced into it during washing of returnable bottles from a working washing solution of a bottle washing machine can significantly increase the life of a washing solution, reduce the cost of purchasing reagents, and reduce the discharge of pollutants into the sewer.

Claims (2)

1. A method of cleaning a contaminated washing alkaline solution of bottle-washing machines, including dosing a reagent into a solution to transfer contaminants into sparingly soluble compounds, followed by clarifying the solution, characterized in that the spent regenerating solution (ORP) after regeneration of ion-exchange cation exchange filters containing calcium chloride is used as a reagent and magnesium. 2. The method according to claim 1, characterized in that the dose of ORP is taken at least 3% of the volume of the cleaned washing solution.