RU1810300C - Method of purifying sewage against non-dissociating impurities - Google Patents

Abstract

FIELD OF THE INVENTION This invention relates to wastewater (W) treatment methods and can be used to treat wastewater from the production of acetate fiber, varnishes, paints, petrochemicals and other industries containing non-dissociating pollutants, e.g. acetone. SUMMARY OF THE INVENTION: Wastewater treatment is carried out by irradiation. The concentration of pollution in irradiated water should be in the range from Ci C + Co / 100 to Ca Co / Yu, where C0 is the initial concentration of pollution; Ci, 2 is the concentration of pollution in purified water. Irradiated water enters the electrodialyzer. 1 tab

Description

The invention relates to wastewater (SB) treatment methods and can be used for the treatment of effluent from the production of acetate fiber, varnishes and paints, petrochemicals and some others containing such non-dissociating pollutants as, for example, acetone.

The purpose of the invention is the reduction of energy costs and the complete purification of water from the intermediate products of radirlysis while maintaining the same degree of purification of CB from the main pollution.

This is achieved by the fact that the initial CB is irradiated with ionizing radiation so that the concentration of pollution is irradiated with C0

water was in the range from C +

100

BEFORE

From 10

where: Co is the initial concentration of pollution in CB, C is the concentration of pollution in purified water; and feed the irradiated water into a desalination chamber

m of oil production facilities

rgetiota proa with SV from

uy m

100

BEFORE

and zar light up the camera

an electrodialyzer (ED) filled with a mixture of cation exchanger and anion exchanger.

The invention consists in the following ..

Non-dissociative pollution in CB under the influence of ionizing radiation. decompose into a number of both dissociating and non-dissociating radiolysis intermediates. The dissociating intermediate products of radiolysis at the next water entry into the desalting chamber of the ED by electric current are transferred through the membranes to the brine chambers of the ED so that the water passing through the ED is purified from these intermediate products.

Non-dissociating intermediates of radiolysis and residues of the main. Charge are adsorbed on the resin and the desalting chamber of the ED, which increases their concentration per unit volume. Further, these compounds interact with longCO

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ABOUT

so o oh

living zodi radiolysis products (in particular with Na02) and with the active products of their decay on the resin (OH, O, HOz radicals, etc.) to the required degree of purification. The speed of these processes on the surface of the resin is higher than in water. The resulting dissociating compounds are also transferred to the ED brine chambers, while non-dissociating compounds remain on the resin.

The radiation-chemical yield of intermediate non-dissociating radiolysis products of the main pollution at a residual concentration of the latter up to 10% of the initial one is such that, when irradiated water enters the desalination chambers of the ED (filled with a mixture of cation exchange resin and anion exchange resin), this amount of non-dissociating intermediate radiolysis products is able to be adsorbed by the resin and interact with active products of radiolysis of water.

The range of concentrations of the main pollution in irradiated water is due to the fact that it is in this interval from the kinetic, technological and energy points of view that it is most advantageous to submit

With irradiated water in ED. The upper limit is due to the limited constant value of the radiation-chemical yield of the primary products of water radiolysis, and a greater amount of pollution cannot interact on the resin with these products; that is, water will pass through the ED without being purified to the required degree of purification by non-dissociating pollution. Thus, as a result of carrying out the cleaning process according to the claimed method, it is possible to achieve what cannot be achieved by separately used methods. Water containing non-dissociating contaminants cannot be purified by electrodialysis in principle. Using ionizing radiation in order to clean water from pollution to CO2 and NaO (from the main pollution from intermediate products of radiolysis), a large energy consumption is required, since not only the rate of decomposition of the main pollution exponentially decreases with increasing degree of purification, but and additional energy is required for the decomposition of the intermediate, both dissociating and non-dissociating radiolysis products.

A distinctive feature of the claimed method is that non-dissociative pollution decomposes by ionizing radiation to a certain residual concentration, which

provides the required degree of water purification from pollution in ED with technological and energy gain.

In this case, the decomposition of non-dissociating compounds to dissociating occurs both under the action of ionizing radiation on the source water and in the desalination chamber of the ED due to adsorption and catalytic decomposition by active

radiolysis products of water. However, if the CB containing non-dissociating contaminants, without preliminary treatment with ionizing radiation, pass through the desalting chamber of the ED, is filled

5 with a mixture of anion exchange resin and cation exchange resin, these contaminants will pass ED almost completely, since they are not transported by electric current through membranes, but of the active products of radiolysis of water in unirradiated

0 no water.

The following examples illustrate the reproducibility of the claimed method.

Example 1. SV containing 200 mg / l

5 acetone, irradiated with ionizing radiation with a dose rate of 1.3 103 rad / s for 36 minutes

The concentration of pollution in irradiated water is 8 mg / l, i.e. lower than required

Values of Ci C + --- 8 + Nm mg / L.

The concentration of intermediate radiolysis products in irradiated water was 34 mg / l. This water is fed into the desalination chamber ED,

5 filled with a mixture of cation exchange resin and anion exchange resin in a 1: 1 ratio, at a rate of 0.9 l / h. The ion transfer rate through the ED membranes is 4.5 mg / min. The concentration of intermediate radiolysis products in purified water is 2 mg / L. When the degree of water purification from acetone 96% reduction in energy costs compared with the prototype is missing.

Example 2. SV processes as in

5 example 1, but the concentration of acetone in irradiated water reaches a value of Ci C +

C + Trrrr 10 mg / L. While maintaining the degree

purification by acetone and intermediate radiolysis products, the reduction in energy costs compared to the prototype is 1.1 times. .

Examples 3-12. CB treatment was carried out according to the scheme of examples 1 and 2. The obtained 5 results are presented in the table.

Thus, the proposed method makes it possible to clean non-dissociating pollutants of CB and effectively solve environmental problems.

Claims (1)

SUMMARY OF THE INVENTION A method for treating wastewater from non-dissociating contaminants, including irradiation with ionizing radiation, characterized in that, in order to reduce energy consumption and increase the degree of purification from intermediate products of irradiation treatment, ionizing radiation treatment is carried out to a concentration of pollution within defined by the formula (C + Co / (- O yuo h (g where Co is the initial concentration of pollution in wastewater; C is the concentration of pollution in purified water, and the resulting water is fed into the desalination chamber of the electrodialyzer, filled with a mixture of cation exchange resin and anion exchange resin.