RU1801951C - Device for treatment of sewage - Google Patents

Abstract

SUMMARY OF THE INVENTION: the device comprises a cylindrical body with a drain pipe, a swirling and straightening swirl, an ejector mounted on the inlet pipe. The dirt pipe is located along the axis of the casing and is perforated in the section in front of the rectifying swirl, and the swirls are made with a variable pitch and have a shock-free inlet and outlet, respectively, and are placed at a distance from each other of L / D 0.019 Fr where L is the distance between the swirls; D is the inner diameter of the housing; Fr is the Froude number for a two-phase mixture. Water enters the inlet of the ejector, where, after mixing with air, the contaminants form photographic units, and then have a bubble flow regime. Further, passing through the swirling swirl, the flow passes from the bubble to the annular flow regime, where the contaminants are separated and removed through the contamination removal tube. The purified water, passing through the rectifying swirl, is removed from the housing. The design improves the quality of cleaning by changing the flow regime of the two-phase flow from bubble to annular, and due to the strong unwinding of the flow due to the variable pitch of the blades of the swirler, the process of separation of pollution is intensified. 1 ill. SB with

Description

FIELD OF THE INVENTION This invention relates to industrial wastewater treatment technology.

The aim of the invention is to increase the degree of liquid from pollution.

The drawing shows the proposed device, General view.

The device consists of a water-air ejector 1, an ejected air supply pipe 2 with a control valve 3, connected to an ejector diffuser 1 of a cylindrical body 4, mounted along with it an pollution discharge pipe 5 with a cover 6 fixed to it, and

Straightening 7 screw swirls of variable pitch, and having a perforation of 9 between them. The outlet 8 serves to remove purified water from the housing 4.

The device operates as follows.

Contaminated water enters the inlet of the ejector 1, which sucks in air through the tube 2 and the control valve 3. At the outlet of the ejector 1, a bubble mode of flow of water-air flow is formed, providing the conditions for the formation of flotation units: air bubble - pollution. The resulting biphasic mixture

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it then passes through a screw swirl b, where it is separated due to mass centrifugal forces acting along the radius of the swirl. Under the action of centrifugal forces in the casing 4, behind the swirler 6, the transition of the bubble flow regime occurs in the annular one, where the pollution moves along the phase boundary.

The surface contaminated layer at the junction of the gas paraboloid is drawn through the perforation 9 of the dirt removal pipe 5. The distance from the swirling swirl to the swirling one is chosen from the following considerations.

It is known from practice that the necessary ratio between the volumetric flow rates of polluted water and air is necessary for the maximum achievable purification is in the range of 0.03-0.05 m3 / m3, which corresponds to a volumetric gas content of 0.029-0.048. When twisting the two-phase flow at such ft, a paraboloid of rotation arises from the point of closure, which begins the cord mode of flow.

The relative length of the paraboloid is determined by the formula. Lr / D 0.02 (1 -Ј) Rcm, where Lr is the length of the paraboloid; D is the inner diameter of the pipe; Fr is the Froude number for a two-phase mixture. With the condition p 0.048, the relative length of the paraboloid is Lr / D 0.019 Fr.

Since the perforation 9 is located between the screw 6 and straightening 7 screw swirls, and the collection of contaminants is carried out already in the cord flow regime, the relative L / D distance between swirls 6 and 7 should be at least 0.019 Fr cm.

. Purified water passes through a rectifier swirl 7, which also acts as a spacer grid and is removed from the housing 4 through

branch 3,

This design improves the quality of cleaning due to the transition of the two-phase flow stream and flotation units from the bubble mode in the ejector to the annular behind the screw swirl, and due to the strong unwinding of the flow, due to the variable pitch of the swirl blades, the process of separation of pollution is significantly intensified with a small hydraulic device resistance.

The proposed device allows its use in flowing wastewater systems as a direct section

a pipeline that does not require changing the traces of the network itself.

Claims (1)

SUMMARY OF THE INVENTION A wastewater treatment apparatus comprising a cylindrical body with a pipe removal of pollution, a swirling swirl, an inlet pipe in the form of a diffuser and a pipe for removing purified water, which means that, in order to increase the degree of purification, it is equipped with an ejector, installed on the inlet pipe, a rectifying swirl located at the outlet of the stream, while the pipe for removing contaminants is located along the axis of the casing and is perforated on the section in front of the straightening sniper, and the swirls are made with a variable pitch and placed at a distance from each other, comprising L / D 0.019 Fr, where L is the distance between the swirls, D is the inner diameter of the housing, Froude Fr number for a biphasic mixture.