SU1433905A1 - Method of treating waste water - Google Patents

Description

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The invention relates to a physicochemical technology for treating a liquid and, in particular, to a technology for separating oil from a spent emulsion used in cutting metals.

The purpose of the invention is to reduce energy consumption.

The method is carried out as follows.

Conducted laboratory research NIN of the proposed method, when extracting from the spent emulsion oil with an initial concentration of 30 g / l. The density of the emulsion as a result of various conditions of its use ranged from 1000.15 to 1001.8 kg / m3. The emulsion was processed in a diaphragm electrolysis with a graphite anode and a filter diaphragm of porous vinyl plastic 0.5 mm thick.

The emulsion was fed into the anode chamber at a flow rate of 2.3-5.5 l / h, and simultaneously an electrolyte was fed into the cathode chamber, the density of which was regulated by dissolving various amounts of sodium chloride in water.

Simultaneously with the electrical treatment, the emulsion was aerated through a porous material located on the bottom of the anode chamber. The diameter of the holes in the porous material 20-50 microns, intensity / min

aeration rate of 0.40-0.50

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The results of electrolysis treatment are summarized in the table., And aeration processing - in the table, 2.

As can be seen from the table, 1, the least 40 power consumption is achieved with the proposed processing parameters (examples 3, 4, 5, 7, 10),

Deviation from any of the proposed parameters leads to an increase in the DS of electric power consumption, or to a decrease in the effect of oil release. So with a decrease in the ratio, the values of the densities of the electrolyte and the emulsion: with respect to the proposed (table 1, en example 1), the consumption of electricity and, accordingly, electricity increases significantly. This is due to the fact that an intensive transfer of anions and part of alkaline water from the cathode chamber to the anodic occurs, which increases the duration of acid emulsion, as evidenced by the consumption of electricity.

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An increase in the ratio accordingly increases the salt concentration in the cathode chamber, which increases the osmotic pressure in it, under the action of which the emulsion enters through the diaphragm into the cathode chamber and at the same time the oil clogs the pores of the diaphragm. As a result, the electrical conductivity of the diaphragm decreases and the power consumption increases (Table 1, example 9)

The decrease in current density also slows down the process, resulting in increased consumption of electricity and electricity (Table. Example 2),

An increase in current density creates an electroosmotic pressure in the cathode chamber, which also leads to a decrease in the electrical conductivity of the diaphragm and an increase in power consumption (Table 1, examples 6 and II),

Reducing the consumption of electricity reduces the efficiency of oil removal due to insufficient acidification of the emulsion (Table 1, Example 8),

As follows from Table 2 (examples 2 and 3), the greatest effect of removing oil from the emulsion is achieved in the proposed aeration parameter ranges.

When testing a known method, aeration was also carried out in the proposed way, since ordinary settling when extracting oil from an emulsion is ineffective.

The results of the comparative tests (duration 8 hours) are presented in Table 3,

When processing the emulsion using the proposed method, the initial parameters of the electrolysis were preserved throughout the tests. With the physical examination of the diaphragm, it was found that deposits on it are missing,

When processing an emulsion using a known method, a voltage increase was observed throughout the experiment. When visually inspecting the membrane and tarpaulin, it was installed (Evlen, that they are covered with a layer of iron hydrokides (iron pop adavt emulsion during the processing of steel parts).

Using the proposed method of separating the oil from the emulsion in comparison with the existing methods reduces energy consumption, greatly simplifies the process.

As a result, fewer devices and, correspondingly, are required for its implementation. The latter is particularly important, since the implementation of the proposed method allows to organize the processing of the emulsion at the places of its preparation, Economitrolite, characterized in that, in order to reduce energy consumption, an auxiliary electrolyte is used, the ratio of which density to the density of the water being purified is (10,011-1,015 ) :, and the process is carried out at a current density of 9-12 A / dm, specific consumption of electricity 8.47-

The effect of the implementation of the proposed method will be significantly at about 8.49 cC / l and with simultaneous aerosol achieved not only by reducing operating costs.

treatment of treated water with an intensity of 0.43-0.45

as well as by saving production space.

Claims (1)

1. A method of treating waste water by treating it in the anode chamber of a diaphragm electrolyzer while simultaneously feeding an auxiliary electrolyte into the cathode chamber of the electrolyzer, characterized in that, in order to reduce energy consumption, an auxiliary electrolyte is used, the ratio of the density to the density of the water to be purified is (1.010- 1,015):, and the process is carried out at a current density of 9-12 A / dm, specific consumption of electricity 8.47- 8.49 kCl / l and at the same time aeri- 8.49 cCl / l and at the same time aeri treatment of treated water with an intensity of 0.43-0.45 2, Method pop, 1, characterized in that the aeration is carried out using a porous material with a pore diameter of 30-40 microns when air is supplied through the openings risky material with a speed of 33, min 34  Table 1 table 2