SU1699937A1 - Sewage treatment unit - Google Patents

Abstract

The invention relates to the field of flotation treatment of wastewater and provides for the almost complete removal of contaminants from wastewater due to the greater air absorption of the liquid to be purified, which is caused by the continuity and stability of the process of air dissolving in water, increasing the area of contact between air and water surfaces. For this, the wastewater dispenser is designed as pressure pipes with nozzles arranged perpendicular to the tank body and equipped with needle valves, the outlet openings of which are connected to the tank body. Inside the latter, there is a fluid level regulator located along the longitudinal axis of the tank and made in the form of a perforated pipe, and baffling platforms located perpendicular to the outlet openings of needle valves. 2 Il. with y

Description

The invention relates to flotation processing of wastewater and can be used in ship power plants.

Apparatus for flotation sewage treatment, used on ships and onshore installations, is known as a pressure vessel of a bubbling type with a spherical and flat bottom, into which contaminated water is pumped by a pump and in which air is saturated with air and subsequent removal of contaminant particles. by combining them with pop-up air bubbles.

The known devices are characterized by insufficient quality of purification of polluted waters, which is due to the low solubility of air (30% of theoretically possible) due to the small surface of the mutual contact of the liquid with air, folded from the total surface of the bubbling air and the open surface of the liquid; the possibility of crushing a large amount of contaminants (breakable by the pump blades due to their high rotational speed) into a finely dispersed and emulsified state, their absence of contact with air bubbles and, accordingly, the removal of particles with the flow of purified water.

Closest to the invention is a device comprising a reservoir, inside which a wastewater distributor is installed (pressure distribution pipe) made with openings facing the surface of the liquid, and pipes for supplying compressed air and wastewater, the quality of wastewater treatment is improved by greater air solubility (the surface of liquid contact with air is increased by D | yubfc

Yu about about with VI

laziness of a jet of water when it leaves the distributor holes).

However, in this device, the wastewater treatment efficiency is insufficient - the air dissolving in water is 81.6%, provided that a significant pressure drop (0.15 MPa) in the holes is maintained (between the distributor and the reservoir cavity), which leads to excessive consumption electricity,

A disadvantage of the known device is also the discontinuity of the process of dissolving air in water due to significant fluctuations in the level of media in the tank.

The aim of the invention is to ensure the continuity of the process of dissolving air in water and increasing the efficiency of wastewater treatment due to the greater absorption of air by the liquid and, accordingly, complete removal of contaminants from it.

The goal is achieved by the fact that the sewage dispenser is made in the form of two diametrically opposite and parallel to each other pressure pipes that surround the tank, the branch pipes of which are perpendicular to the tank body and are equipped with needle valves, the outlets of which are connected to the latter medium and fender platforms located opposite the aforementioned outlet orifices, the self-adjusting medium level being located along the longitudinal axis tank and made in the form of a perforated pipe.

Such a constructive implementation of the wastewater distributor increases the mass transfer area of the two phases (water and air), the duration of their contact (without increasing the residence time of water in the tank) and, therefore, intensifies the process of air dissolution in water with low energy consumption to maintain the pressure differential between nozzles and tank (0.05-0.10 MPa), which ensures the continuity of the process of dissolving air in water and increases the solubility of air to 96.8% and the efficiency of water purification.

The supply of the tank with fender sites and the location of the nozzles perpendicular to the tank body and, consequently, the fender plots ensure the most complete intensive splitting of the jet and the heme itself also ensures high air solubility in water, which increases the efficiency of water purification.

The supply of nozzles with needle valves reduces clogging of the internal devices of the tank, which also ensures the stability of the process.

dissolving air in water and increasing the efficiency of water purification.

In addition, such a constructive execution of the outlet openings of the needle valves with the tank body allows

supply one part of the liquid to the air and the other part to the water, which increases the surface of the droplets passing through the volume of air and increases the amount of air absorbed by them and, moreover, intensifies

the process of air dissolution in water (intensive mixing of the lower layer of water in the tank, its capture from the surface of air bubbles into the interior of the volume, crushing and dissolving the latter), therefore

ensures the continuity of the process of air dissolution in water and increases the efficiency of water purification.

Placing the level self-regulator inside the tank along the longitudinal

the latter’s axis and its implementation in the form of a perforated tube eliminate significant fluctuations in water and air, and also prevents insoluble air bubbles from escaping into the hydraulic chamber, which ensures the continuity and stability of the process of air dissolution in water and increases its dissolution and water purification efficiency. knowledge

FIG. 1 shows a device for

wastewater treatment, general view; in fig. 2 shows section A-A in FIG. one.

The wastewater treatment device comprises a reservoir 1 and a wastewater distributor made in the form of pressure pipes 2, covering the indicated reservoir from the outside and diametrically opposite and parallel to each other and equipped with nozzles 3, Nozzles 3 are located perpendicular to the body of the reservoir 1 and are equipped with needle valves 4, the outlet openings of which are connected to the tank body 1.

0 Inside the tank 1, the medium level regulator 5 is placed to ensure a constant water level and drain off one of the working media (water or air), located along the longitudinal axis along the last 5 and made in the form of a perforated pipe, perpendicular to the discharge pads 6 openings of needle valves 4, and partitions 7, separating its working volume from the hydraulic chamber.

Outside the tank 1, there is an air line 8 for supplying compressed air, a pipe 9 for draining air saturated with air.

Manometers 10, which fix pressure drops between nozzles 3 and reservoir 1, are placed on the last and pressure pipe 2.

The operation of the device in the ship power plant is carried out as follows.

Tank 1 is supplied with waste water through pressure pipes 2 and nozzles 3, and compressed air is continuously blown through the air line 8.

Water jets flowing out of the outlets of the needle valves 4 at high speed hit the sampling pads 6 and are crushed into smaller jets and droplets, which when they fall into the upper zone of the tank 1 absorb air on themselves, and when they fall into the lower zone they mix the surface of the water, thereby renewing the surface of mass exchange, trap air bubbles from the interface into the volume of water, crush them, accelerating the dissolution of the latter.

The remaining undissolved large air bubbles are released from the water in front of the hydraulic chamber, discharged through regulator 5, which ensures the level of water and air.

Air saturated with water is removed from tank 1 through the hydraulic chamber and out through pipe 9 into the flotation tank, in which the separation takes place.

air bubbles with contaminants adhering to them from the stream of purified water.

The effectiveness of the proposed device as compared with the known one is in the continuity and stability of the process of air dissolving in water, increasing the degree of water saturation with air and purification efficiency (almost complete removal of contaminants from waste water), reducing power consumption (the possibility of reducing the pressure differential between nozzles and reservoir) .

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A wastewater treatment apparatus comprising a reservoir, a wastewater distributor, and a pressure pipe for supplying compressed air, characterized in that, in order to ensure the continuity of the air dissolving process and increase the efficiency of water purification due to the greater air absorption by water, the wastewater distributor two surrounding tank outside diametrically opposed and parallel to each other pressure pipes, the pipes of which are located perpendicular to the tank body are provided with needle valves, outlets of which are connected to the housing and the reservoir is provided with a level regulator and the environment baffle pads disposed opposite to the outlet openings, wherein the regulatory environment prior torus located along the longitudinal axis of the tank and is designed as a perforated pipe. R / 2 d- --- zt-s dEDCDEZlJI tiji R Phie.1 five 1