SU1685874A1 - Method of flotation cleaning of liquids of admixtures - Google Patents

Abstract

The invention relates to chemical technology, in particular, to a technique for the treatment of liquids, namely the treatment of wastewater, natural and recycled water. The purpose of the invention is to increase the cleaning efficiency. The installation for carrying out the method contains pressure flocculator 3, saturator 4, pressure reducing valve 6, flotation separator 7 and air ionizer 10. Improving the application efficiency is achieved by ionizing the air before saturation. 5 hp f-ly, 1 ill., 1 tab.

Description

The invention relates to the field of chemical technology, in particular, to the technique of cleaning liquids, and can be used to purify natural, waste and recycled water from easily dispersed soils.

The purpose of the invention is to increase the cleaning efficiency.

The essence of the method is that the liquid is treated under overpressure by flocculation of impurities and air saturation and separated at atmospheric pressure. Before saturation, the air is ionized. It is advisable to saturate the fluid alternately ionized and non-ionized air. The fluid can be saturated with both ionized and non-ionized air. It is advisable to saturate the liquid with ionized air prior to flocculation of impurities under pressure and to saturate with non-ionized air during and / or after flocculation of impurities under pressure. Separation can be carried out under vacuum. The separation is advisable to conduct under vacuum with simultaneous purging of the liquid with ionized air,

The drawing shows a diagram of the method of flotation purification of liquids from impurities.

The installation for carrying out the method comprises a pipeline 1 supplying the liquid to be cleaned, a pump unit 2, pressure flocculator 3, a saturator 4, a pipeline supplying liquid to separation 5, a reducing valve 6, a flotation separator 7, a pipeline for discharging the purified liquid 8, flotation slurries, a flotation device Tashlama 9, a device for air ionization 10.

The method is carried out as follows.

The liquid to be cleaned through pipeline 1 is fed to the cleaning and pumping unit 2 under pressure is pumped into the pressure flocculator 3, where the process of enlargement of impurities takes place. After enlargement of the impurities, the liquid to be cleaned is treated in a saturator 4, where it is saturated with ionized air under pressure,

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the ionization of which is carried out by means of the device 10. In the saturator, complexes of enlarged impurities — bubbles of ionized air — are formed. The degree of adhesion of these complexes will be the higher, the higher the degree of air ionization and the more often impurities and air bubbles will collide with each other. Since the ionized air (bubbles of this air) has an excess energy obtained during ionization, when going into equilibrium, the latter will be spent on transferring particles of contaminants (impurities) and increasing the degree of adhesion of electrically charged objects (particle of impurities - gas bubble). Formed complexes through pipeline 5 are fed to the purification (separation), passage through the reduction valve to / gas 6. After the pressure relief valve 6. in the direction of the liquid being processed, at atmospheric pressure, flotation (separation of impurities in the foam layer) will occur in the float separator 7 . The purified liquid is discharged to the consumer via pipeline 8, and the flot slats (impurities accumulated at the level of the water mirror) are discharged by the device 9 for disposal (dewatering).

To simplify the process, the saturation of the fluid is alternately ionized and non-ionized air.

To intensify the flotation separation of the impurities found in the treated liquid in large concepts, the liquid is simultaneously saturated with ionized and non-ionized air.

In order to intensify the process of separating the liquid from impurities present in the latter in high concentrations, this liquid is saturated with ionized air before the flocculation of impurities under pressure and is saturated with non-ionized air during and / or after the flocculation of impurities under pressure.

To increase the degree of purification of the liquid, the separation of impurities is carried out under vacuum, which contributes to a more complete use of ionized air dissolved in the liquid to be purified.

If it is necessary to clean the liquid from specific contaminants, for example, surfactants, surfactants, oils, the separation of these impurities is carried out under vacuum with simultaneous purging (sparging) of the liquid with ionized air.

Example. Whether the liquid was cleaned (hereinafter referred water or

water) by the known and proposed methods.

Characteristics of the treated water.

The content of suspended substances of mineral origin, ml / l - 89 ... 93; composition of suspended substances,%: 60 ... 65 Re (OH) s; 10 ... 15 NI (OH) Z; 8., 7 Cu (OH) 2; 7 ... 5 Cr (OH) s; 7 ... 3 7p (OH) h; 8 ... 5 other impurities. Duration of aging of impurities, h: 85 ... 92. Redox potential, mV: +285 .., + 360. The magnitude of the active reaction of the medium, units; 8.8 ... 9.1. Temperature, ° С: 17.5.,. 18.5. Salinity, mg / l: 23000 ... 2700.

Characteristics of devices and technical and technological parameters of a known method. The excess pressure created by the pump unit, MPa: 0.1 .., 0.75. Duration of flocculation under pressure, s; 180, .. 240. Pressure at which flocculation is carried out, MPa: 0.1 ... 0.75. Camp Criterion: 9 ... 17. Flocculator velocity gradient, 65 ... 95. Air consumption, n / MJ: 35 ... 40. Duration of saturation of water in the saturator, s: 180 ... 300. Duration of flotation, min: 5 ... 40. Intensity of flotation sludge collection: every 3.0 ... 3.5 hours of operation of the flotation separator.

Characteristics of the device and the technical and technological parameters of the proposed method.

Similar to the above, except that the air that saturates water is ionized. Power consumption for air ionization, kW, h / m3: 0.02 .., 0.10. Maximum current consumed by the ionizer, A: up to 2.5. Current frequency in the supply network, Hz: 50. Voltage in the supply network, V: 220.

The parameters monitored are the water purification efficiency and the duration of the flotation separation.

The research results are summarized in the table.

As can be seen from the above data, the new method provides a higher (by 26 ... 8%) degree of water purification from easily dispersed impurities in comparison with the known method. In addition, the duration of the flotation separation is reduced, which leads to an increase in the productivity of existing and reduced dimensions of the designed devices used to implement and method. The application of the method is relevant to environmental water treatment facilities.

Claims (6)

1. A method of flotation purification of liquids from impurities, including its treatment under excess pressure by flocculation of impurities and saturation with air and subsequent separation, characterized in that, in order to increase the cleaning efficiency, the air is ionized before saturation. 2. A method according to claim 1, characterized in that the liquid is alternately saturated with ionized and non-ionized air, 3. A method according to claim 1, characterized in that the liquid is saturated simultaneously with ionized and non-ionized air. 4. A method according to claim 1, characterized in that the liquid is saturated with ionized air prior to flocculation of impurities under pressure and saturated with non-ionized air during and / or after flocculation of impurities under pressure. 5. A method according to claim 1, characterized in that the separation is carried out under vacuum. 6. A method according to claim 5, characterized in that the separation is carried out while simultaneously purging the liquid with ionized air. YU Air