SU1520016A1 - Method of purifying waste water of dyes and organic substances containing sulfogroups - Google Patents

Abstract

The invention relates to methods for treating wastewater from the production of light and chemical industries, mainly to purifying wastewater from direct, acidic, active dyes and cubozols, as well as organic substances containing one or more sulfo groups in a molecule. The invention simplifies the process. The method is carried out by filtering wastewater through a granular charge and adsorbing on the sulfurum in the H-form with preliminary introduction of sulfuric acid before adsorption into the effluent to the ratio of its concentration in water to the specific content of sulfo groups in the sulfonule (0.01-0.1): 6 . 1 tab.

Description

The invention relates to the purification of wastewater production of light and chemical industry, mainly to the purification of waste nodes from K; direct, acidic, active dyes and cubozols, as well as organic substances containing one or several sulfo groups in the molecule.

The aim of the invention is to simplify the process.

PRI e r.I. Wastewater from the dye shop containing 28 mg / l of direct blue dye (color intensity at a dilution of 1: 250),

160 mg / l of non-ionic surfactant OP-10, 80 mg / l of NaCl, 25 mg / l of suspended substances and having a pH of 8.5, in an amount of 15 l are loaded into a 20-liter container, to which is added with stirring concentrated sulfuric acid ( 90.5%) at the rate of 3 ml of acid per 1 liter of wastewater. After 10 minutes of stirring, the contents of the container are allowed to settle for 30 minutes.

The settled wastewater is fed to the sand filter, the filtrate is taken into the collection. Next, the filtrate comes

a tank is pushed in, from where it is siphoned to a carbon filter containing 200 g of sulfone coal in H- (1 ounce (in terms of air-dry)) The filtrate is fed to the carbon filter at a ratio of the sulfuric acid contained in it to the specific sulfonic sulfonic groups 0.1: 6.

Past carbon filter is discharged with the water of tsrin1- (they are collected in a collector, where they are neutralized with sodium hydroxide to .рН 7. The degree of wastewater purification from dyes at the same time is 99.98%, from surfactants 96%. The content of mineral salts in the treated wastewater, PO mg / l. After 200 g, the sulfougle is passed through 3.5 m of wastewater, after which the filter capacity drops twice.

The sorption capacity of the sulfougle at the time of the plant capacity decrease is two times 0.5 g of dye per 1 g of sorbent.

The filter is regenerated with a 10% sodium hydroxide solution, after which the filter is treated with a solution of sulfuric acid to convert it to the H-form.

PRI mme R 2. The process is carried out similarly to Example 1, the tolerance is the ratio of the concentration of sulfuric acid in the waste water to the specific content of sulfo groups in the sulfo coal 0.01: 6. In this case, the degree of wastewater purification from dye is 99.96%, and 96% of the surfactant. The content of mineral salts in purified water is 100 mg / l. The sorption capacity of the sulfougle at the time of the installation capacity decrease by half 0.5 g of dye per 1g of sulfougl.

PRI me R 3. The process is carried out analogously to example 1, the tolerance ratio of the concentration of sulfuric acid in the wastewater is 0.05: 6, the degree of purification of wastewater from dyes is 99.98%, from surfactants 95.8%, the content of mineral salts 105 mg / l, sorption capacity of sulfonate 0.5 g of dye per 1g of sulfougl.

EXAMPLE 4. The process is carried out analogously to example 1, the tolerance ratio of sulfuric acid concentration in waste water is 0.5: 6. The degree of wastewater treatment from dyes is 99.98%, from surfactants 96.0%, the content of mineral salts in purified water is 220 mg / l

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Sorption capacity 0.5 g of dye per 1 g of sulfougl.

PRI me R 5. The process is carried out analogously to example 1, the tolerance of the concentration of sulfuric acid in solution to the specific content of sulfo; groups in the sulfoule 0.005: 6. In this case, the degree of wastewater purification from dyes is 79%, from SALA 80.5%, the content of mineral salts in purified wastewater is 100 mg / l, the sorption capacity of sulfone coal is 0.005 g / l.

The results of wastewater treatment by the proposed method are presented in the table.

As follows from the table, a change in the ratio of sulfuric acid to the specific content of sulfonic sulfonic acid toward an increase in the concentration of sulfuric acid leads to additional expenditures of both sulfuric acid and sodium hydroxide for its neutralization while maintaining the sulfonated sorption capacity. At the same time, the total mineralization of the treated wastewater increases, which makes it impossible to reuse it.

A change in the ratio towards a decrease in the concentration of sulfuric acid leads to a sharp decrease in the degree of wastewater treatment and sorption. the capacity of sulfonate due to the absence of conditions for the hydrolysis of sulfo groups of the dye,

PRI me R 6. (by a known method), Wastewater from the dye shop containing 28 mg / l of direct blue dye (dilution intensity 1: 250) 160 mg / l SP-10, 80 mg / l NaCl and 25 mg / l of suspended substances.tv, having a pH of 8.5 from a 20-liter siphon tank, are fed to a sand filter column made of organic glass with a diameter of 100 mm and a height of 500 mm, filled with quartz sand with a loading size of 0.5-1 2 mm. Filtering lead at a speed of 6 m / s. The filtrate is taken in a collection. Then it is passed to the pressure tank, from where the filtrate is siphoned to a carbon filter loaded with sulfure coal in the Na form. Sulfur coal weight (air dry) 200 g

Filtration is conducted from the top down at a speed of 6 m / s. The filtrate is taken in the collection, where it is neutralized with a 1.5% solution of sulfuric acid.

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The degree of wastewater treatment from dyes is 70%, from surfactants 58%, the content of mineral salts in purified wastewater 110 mg / l. Sorb; sulfonic coal 0.01 g of dye per 1 g, coal.

Thus, the proposed method, by comparison with the known, increases the sorption capacity of the sulfougle by 50 times, simplifies the technological scheme of purification due to the exclusion of the coagulation stage and flotation,

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Claims (1)

Invention Formula The method of purification of waste water from dyes and organic substances containing sulfo groups by filtration through a granular charge and adsorber 1, sulphurene, characterized in that, in order to simplify the process, before adsorption, sulfuric acid is added to the ratio of its concentration to water to the specific content of sulfo groups in the sulphuret, equal to 0.01-0.1: 6, and adsorption is carried out on the sulfougle in the H-form. Specifications Indicators of treated wastewater at a ratio of the concentration of sulfuric acid to the specific content of sulfo groups, mEq / l 0.75: 6 0.5: 6 I 0.25: bT 0.1: bTo, 05: 6 j 0.01: 6, 0075: b | 0.005: b | o, 0025: 6 99.99 96,10 250 0, 5 70.00 58.0 0.01 99.98 99.98 96.05 96.05 220 0.5 180 0.5 99.98 99.97 99.96 97.20 79.00 96.00 95.80 96.00 82.35 80.50 110 0.5 105,100 0.5 0.5 105100 0,008 0,005 77.50 J80.00 95 0,005