RU2482075C1 - Method for aeration of oil-containing waste water - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention can be used in waste water treatment. The method for aeration of oil-containing waste water involves facilitating interaction of waste water with a volume of air at pressure higher than atmospheric pressure in a reservoir (1) through a nozzle extension (3). Oil-containing waste water is ejected by a jet of compressed air into the nozzle extension (3) which is in form of a cylinder bushing whose bottom opening is linked to a source (6) of compressed air and the top (7) opening is open to the cover of the reservoir (1). The jet of compressed air is then used for spraying in the volume of air which is at pressure higher than atmospheric pressure to form a spray cone from bottom up.

EFFECT: invention enables to carry out instant aeration of a given volume of an oil-containing liquid.

1 dwg

Description

The method relates to the saturation of oil-containing water with air and can be used in vacuum flotation plants to create schemes for continuous liquid purification.

There is a method of aeration of oily wastewater, in which air is supplied to the pipeline in front of the pump, the resulting air-water mixture is stored in a special pressure tank for 8-10 minutes, from where it is supplied to the flotator, where pressure is released and air bubbles are released from the water (see Richter L .A. Protection of water and air basins from emissions of thermal power plants - M .: Energoizdat, 1981, pp. 211-212).

The disadvantage of this method is its frequency, caused by the need to spend time saturating the liquid in the pressure tank.

There is also known a method of aerating a liquid, in which a distribution pipe with openings facing the surface of the liquid, through which water in the form of thin jets flows out at a high speed and interacts with the surface of the saturated liquid, is supplied to a pressure vessel under pressure. At the same time, the jets capture a certain amount of air and transport it into the volume of the liquid being cleaned (see Auto Certificate No. 155456, IPC C02F 1/24, 1963).

The disadvantage of this solution is the low exciting ability of the jet due to the small area of interaction of the jet with the air phase. In addition, a significant portion of the air transported by the stream of air remains undissolved and is released in the bubbles on the surface of the liquid. As a result, this device does not provide the necessary quantitative saturation of the liquid with air.

There is also known a method of aeration of oily wastewater, including providing through nozzle nozzle their interaction with the volume of air under pressure above atmospheric (see RF patent No. 2389692, IPC C02F 1/24, C02F 1/74, 2010). The disadvantages of this solution include the unsatisfactory degree of aeration of the liquid being cleaned, due to the small amount of air transported by the jet.

The problem to which the claimed solution is directed is to increase the degree of aeration of the volume of wastewater.

The technical result achieved when solving the problem is expressed in increasing the degree of saturation with air at elevated pressures by the absorbent torch of the sprayed oil-containing liquid, which makes it possible to instantly aerate a given volume of oil-containing liquid, without the need to spend time saturating the liquid in a special tank. In addition, with such a supply scheme, a “feed” with compressed air of the volume of air under pressure above atmospheric is provided.

The problem is solved in that the method of aeration of oily wastewater, including providing by means of a nozzle nozzle their interaction with a volume of air under pressure above atmospheric, characterized in that the oily wastewater is ejected into the cavity of the nozzle nozzle by a stream of compressed air, which is then used for their spraying in the volume of air under pressure above atmospheric, with the formation of a spray pattern from the bottom up.

A comparative analysis of the features of the claimed solution with the features of the prototype and analogues indicates the conformity of the claimed solution to the criterion of "novelty."

At the same time, the set of essential features of the claims provides intensive aeration of the ooze-containing liquid without the need to spend time saturating the air in a special pressure tank and allows continuous aeration with subsequent flotation.

Figure 1 schematically shows a cross section of a device that allows the method.

The drawing shows a tank 1, channel 2, nozzle nozzles 3, level 4 of oily wastewater, vertical axis 5, a source of compressed air 6, the upper hole 7 of the nozzle nozzle 3, gas pressure regulator 8, droplet eliminator 9, drainage tubes 10, annular protrusion 11 , pipe 12.

A device for aeration of oily wastewater contains a tank 1, preferably cylindrical, configured to maintain air pressure in it above atmospheric, a channel 2 connecting the cavity of the tank 1 with a source of wastewater (not shown), and nozzle nozzles 3, the outlet of which is located above the level oily wastewater 4 in the tank 1, located on its vertical axis 5. The nozzle nozzles 3 are made in the form of a cylindrical sleeve, the lower hole of which is communicated with a source of compressed air 6, and the top its 7 is open to the roof of the tank 1. In this case, the nozzle nozzles 3 are made with the possibility of ejection of oily wastewater, for which the outlet of the channel 2 connecting the cavity of the tank 1 with the source of wastewater is open into the cavity of the nozzle nozzle 3. A regulator is installed in the roof of the tank 1 gas pressure 8. To prevent the liquid phase from entering the gas flow regulator 8, the tank 1 is equipped with a drop eliminator 9, equipped with drainage tubes 10 to drain the accumulated liquid in it. Also, the tank 1 is equipped with a droplet-forming annular protrusion 11, which prevents the droplets of the sprayed liquid from swelling along the walls of the tank 1. In the bottom of the tank 1 there is a pipe 12 for draining the saturated liquid.

The method is as follows.

In the nozzle nozzles 3 located inside the pressure tank 1, compressed air is supplied from the source 6, which ejects from the wastewater source (not shown), through the channel 2 a saturated oil-containing liquid that has passed the vacuum flotation stage, for which the outlet of the channel 2 is open in the cavity of the nozzle nozzle 3. As a result, a torch consisting of fine particles of the aerated medium directed along the vertical axis 5 of the reservoir 1 is sprayed from the upper hole 7 of the nozzle nozzle 3. Due to the large surface area p Cereal liquid and gas phase fine particles being cleaned oily liquid was absorbed with high efficiency in air. In this case, due to the supply of compressed air in the tank 1 creates excess pressure, the value of which is controlled by the gas pressure regulator 8 - an increase in the excess pressure leads to an increase in the efficiency of this saturation method. The droplet eliminator 9 prevents the aerated medium from entering the pressure regulator 8, and the drainage tubes 10 discharge the accumulated liquid into the walls of the reservoir 1. The droplet-forming annular protrusion 11 prevents the flow of liquid along the walls of the tank 1, thereby increasing the area and contact time between the liquid and gas phases. The air-saturated liquid is removed from the tank 1 through the pipe 12 and sent to the vacuum flotation stage for repeated, deeper cleaning.

Claims (1)

A method of aerating oily wastewater, including providing, by means of a nozzle nozzle, their interaction with a volume of air under pressure above atmospheric, characterized in that the oily wastewater is ejected into the cavity of the nozzle nozzle by a stream of compressed air, which is then used to spray them in the amount of air located under atmospheric pressure, with the formation of a spray pattern from the bottom up.