SU1717552A1 - Device for aeration of sewage - Google Patents

Abstract

This invention relates to biochemical wastewater treatment. The aim of the invention is to improve the efficiency of airflow Aeration and reliability of the device. The device comprises a vertical guide pipe 1, a mechanical aerator 2 installed inside it in its upper part, a duct 3 located inside a vertical pipe 1 above a mechanical aerator 2, a reflective cone 4 placed below a vertical pipe 1, a conical nozzle 5 installed inside a vertical pipe 1 under the mechanical aerator 2. In this case, the conical nozzle 5 is made of separate petals-segments pivotally attached to the vertical pipe 1 and connected to each other.

Description

springs. In the normal hydrodynamic mode of operation of the mechanical aerator 2, the conical nozzle 5 is opened by the flow of the water-air mixture, the petals-segments are lowered and the springs are stretched. The air-water mixture, the passage of the conical nozzle 5, is additionally dispersed by the petals-segments and springs. In case of violation of the hydrodynamic mode of operation of the mechanical aerator 2 (for example, when

the increased foaming in the aeration zone) the velocity head created by it decreases, the conical nozzle 5 partially covers, and the petals-segments under the action of the springs contract until their forces are balanced by the velocity flow of the water-air mixture. The invention allows to increase the degree of biochemical purification of waters containing foaming substances. 3 il.

The invention relates to the biochemical treatment of wastewater, in particular, to saturate the treated wastewater with atmospheric oxygen with oxygen and can be used in aeration facilities for the treatment of domestic and industrial wastewater.

Closest to the present invention is a device comprising a guide tube and a mechanical aerator mounted on the vertical shaft, a nozzle mounted inside the tube under the screw.

The drawback of the device is the low reliability and efficiency of wastewater aeration, due to the insufficient degree of turbulization of the air-water flow in the bottom part of the structure. In addition, this design does not provide a constant emphasis on the mechanical aerator on the liquid side, therefore, under conditions of varying mechanical loads, the reliability of the aerator operation decreases.

The purpose of the invention is to increase the efficiency of wastewater aeration and the reliability of the device.

This goal is achieved by the fact that in a device containing a vertical pipe and mounted inside, on a vertical shaft in the upper part of the mechanical aerator, air ducts and a conical nozzle, the latter is made of separate lobes-segments hinged to the vertical tube and spring-loaded relative to each other.

Due to the fact that the nozzle is made of lobes-segments, hinged and spring-loaded, it can change its flow area from the minimum (when the petals are pressed together) to the maximum (the nozzle is fully opened by the flow of the injected fluid). When changing the density of the injected fluid flow, which can occur during foaming in the volume of the zone

- aeration, the velocity head created by the mechanical aerator is changed, and the petals-segments of the nozzle, rotating on the hinges, either open or partially close due to the fact that they are spring-loaded. The maximum opening of the nozzle occurs during normal hydrodynamic operation of the device, and in case of violation of the operation mode, i.e. at

By reducing the velocity head for some reason, the nozzle closes. Due to the fact that the nozzle during operation of the device under the action of the velocity head either opens or closes, a constant emphasis is placed on the screw of the mechanical aerator, which ensures the constant load on the aerator and, consequently, increases the reliability of its operation. In addition, the petals of the nozzle are peculiar distributors of the flow of the air mixture injected by a mechanical aerator, which provides additional dispersion of the water-air mixture, increasing

mass transfer coefficient of air oxygen into the liquid and, as a result, increase in the efficiency of wastewater aeration. FIG. 1 shows the device, a longitudinal section; in fig. 2 - section AA on

FIG. one; in fig. 3 - petal segment, general view.

The device comprises a vertical guide tube 1 and a mechanical mechanical device installed inside it in the upper part.

aerator 2, air ducts 3, located above the aerator inside the pipe, a reflective cone 4, located under the pipe 1, a conical nozzle 5 installed in the pipe 1 under the aerator 2, while

the nozzle is made of individual petals-segments 6, pivotally attached to the pipe 1 and spring-loaded springs 7 relative to each other.

With the rotation of the mechanical aerator

2 a downward flow of the treated liquid is created inside the pipe 1, with

an account of the rotation of the aerator through the air inlets 3 draws atmospheric air, with which the treated liquid is mixed with the bubbles. The water-air mixture is pumped by the aerator 2 into the bottom part of the structure, where, cut by cone 4, it changes direction and moves upwards, while air bubbles penetrate the entire volume of the aeration zone, saturating the liquid with oxygen. In the normal hydrodynamic mode of operation of the aerator 2 by the flow of the air-air mixture, the nozzle 5 is opened (shown in Fig. 1, dotted line), the petals-segments 6 are lowered, and the springs 7 are stretched, and in this position it is held by the flow pumped by the aerator 2. Air mixture, passage the nozzle 5 is additionally dispersed by the segment lobes 6 and the springs 7, the air bubbles are crushed, which increases the mass transfer coefficient of air oxygen into the liquid in the volume of the aeration zone, and hence the efficiency of aeration. When the hydrodynamic mode of operation of the aerator 2 is disturbed (for example, with increased foaming in the volume of the aeration zone), the velocity pressure generated by it decreases, while the nozzle 5 partially covers and the petals segments 6, vrassch

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the hinges under the action of the springs 7 are tightened until the forces of the springs are balanced by the high-speed flow of the water-air mixture. When restoring

the hydrodynamic mode of operation of the aerator 2 by a high-speed flow of fluid the nozzle 5 is opened.

The application of the proposed design of the device in which the conical nozzle

5 is made of separate lobes-segments, which are hinged to pipe 1 and spring-loaded relative to each other, allows to increase the efficiency of wastewater aeration and reliability of operation.

device due to the stabilization of the mechanical load on the aerator 2.

Claims (1)

The formula was invented and the Wastewater aeration device, containing a vertical pipe, mounted inside it on a vertical shaft in the upper part of it, a mechanical aerator, air ducts and a conical nozzle, which is designed according to that. that, in order to increase the efficiency of aeration and reliability of the device, the nozzle is made of separate petals-segments hinged to a vertical pipe, and the petals-segments are provided with springs connecting them with each other. Fig.Z