RU2070547C1 - Pneumatic aerator - Google Patents

Abstract

FIELD: aerobic biological purification of natural water and man-made waste water in various industries. SUBSTANCE: to reduce operating expenses and facilitate repair works in case of plugging up of working beds of aerator, the latter contains a framework in the form of a perforated polymer tube and a high-porous (pore diameter 500-600 mcm) removable protective bushing prepared by pneumoextrusion method. The bushing mounts inside framework on special protrusions on threaded couplings which are available in the framework at both sides to provide possible sectional elongation of arrangement. Polymer tube has conical openings arranged in rows and being shifted to each other in adjacent rows by half distance between openings in each row. Framework is two-directionally wound with volume polymer cord creating a transitional layer on which a porous bushing is placed. The latter has been prepared by pneumoextrusion technique and serves as support for dispersing layer with 50-80 mcm porosity. EFFECT: reduced cost and simplified operation. 4 cl, 2 dwg

Description

 The invention relates to a device for aeration of a liquid during biological treatment of natural, domestic, wastewater and can be widely used in various industries.

 Various types of aeration devices are known for purifying natural and industrial wastewater.

 For example: A “pneumatic aerator”, comprising a housing, a dispersant, a holder and a check valve, is also equipped with an acoustic oscillator made in the form of a nozzle and a resonator with a piston located in the housing along the axis of the pneumatic aerator between the dispersant and the check valve, while the piston rod passes through a hole made along the axis of the dispersant, and the dispersant is made in the form of a porous disk with an axial hole (A.S. N 1583366, class C 02 F 3/20 from 08/07/90).

 "Method and device for the treatment of groundwater using sparging", the device contains a pipe placed on the flow path and passing water through the wall, sparging is carried out from the head into the water to bring pollution to the surface. Part of the diaphragm of the dam is made in the ground in order to direct the flow of groundwater through gaps into which several such pipes can be installed, and the gas may be air (UK application N 2185901, CL B 01 F 3/04 of 05/05/86).

 A "device for passing air through wastewater" comprises a housing within which an air chamber is formed, air enters the chamber through one end of the housing, the second end of the housing is made of non-porous material and contains a perforated plate through which openings air is supplied from the chamber to the wastewater. The outer surface of the plate is smooth. The diameters of at least 95% of the perforation and differ by ± 20% from the nominal diameter of 50-300 microns (US patent N 4478766, CL B 01 F 3/04 from 10.23.84).

 A "device for saturating a liquid with gas" is intended for introducing oxygen into clarification plants using tubular porous bodies that supply gas. After passing through a porous pipe, gas in the form of bubbles through the walls of the pipes enters the liquid. The device is characterized in that the pipes on both ends are open and connected to the gas supply pipeline (German application No. 3744608, class B 01 F 3/04, C 02 F 3/20, dated July 13, 89).

 "A method and apparatus for dissolving air in a liquid while minimizing its movement by colliding a fluid stream displaced from small pores under centrifugal force pressure with air (Japanese application N 60-78626, CL B 01 F 3/04, 08.29.85 )

 Closest to the proposed invention is a technical solution described in the application of Germany N 3226065, C 02 F 3/20, 1983.

 A tubular aerator for aeration of wastewater contains a frame in the form of a perforated pipe, a porous sleeve mounted on it, a dispersing layer (in the form of a rubber shell with thin slots) and an intermediate layer in the form of a spiral perforated hose placed between the pipe and the sleeve.

 The disadvantages of the above devices include their complexity and low life.

 The aim of the invention is to reduce operating costs and facilitate repair work when driving the working layers of the device.

 To achieve this goal in a known device containing a housing in the form of a perforated polymer pipe with a winding on its outer surface, the polymer pipe is equipped with a highly porous removable protective sleeve obtained by pneumatic extrusion and having a porosity of 500-600 microns. A protective sleeve is installed on the inner surface of the frame on special protrusions of the threaded couplings, which are provided with the device body on both sides to ensure possible sectional extension of the device. For this purpose, the couplings have mating threads: one external, the other internal. In addition, the polymer pipe is equipped with conical holes arranged in rows with a displacement in adjacent rows equal to half the pitch between the holes.

 A polymer bulk tow is wound onto the frame in two directions with overlap, which forms an intermediate layer, on top of which there is a porous sleeve obtained by pneumatic extrusion and serving as a substrate for a dispersing layer with a porosity of 50-80 μm.

 Instead of a porous sleeve, a polymer network of 3-5 layers can be used as a substrate for the dispersing layer, each of which is dressed with a “stocking” for volume coiling.

In FIG. 1 shows a longitudinal section through a pneumatic aerator; in FIG. 2
cross section of the aerator.

 The pneumatic aerator with thermowell according to FIG. 1 and 2 comprises a frame 1 in the form of a perforated polymer pipe, perforation consisting of conical holes 2, threaded couplings 3 and 4 mounted on the ends of the pipe and having special protrusions, a bulk polymer bundle 5 wound on the frame and forming an intermediate layer, a porous sleeve 6, placed on top of the tow and obtained by pneumatic extrusion with a porosity of 150-200 microns, a dispersion layer 7, deposited by pneumatic extrusion with a porosity of 50-80 microns and a highly porous removable protective sleeve 8, obtained by pneumatic extrusion with porosity with a thickness of 500-600 microns and mounted on special protrusions of threaded couplings inside the frame. The conical holes 2 are arranged in rows with an offset in adjacent rows equal to half the pitch between the holes.

Description of work
1. An example of a single installation (one end of the aerator is plugged).

 The dispersible medium under pressure is fed into the perforated pipe 1 and, having passed through the highly porous sleeve 8 and perforation 2, enters the interlayer space, where it is freely distributed in the channels formed by the body of the frame, the tow 5 and the porous sleeve 6, then the dispersible medium passes through the dispersing layer 7 itself. in which the complete uniformity of its distribution along the entire length of the aerator is achieved, as well as its fine bubble.

 2. An example of a sectional installation.

 From single sections of the aerator, by screwing on the mating threads of the couplings one on the other obtain lashes of a given length, which are laid on the bottom of the tank, and in each section of the lash the process described in Example 1 occurs, and with the use of such a sectional device, its distribution is uniform throughout the length of the aerator, as well as its fine bubble.

 2. An example of a sectional installation.

 From single sections of the aerator, by screwing on the mating threads of the couplings one on top of the other receive lashes of a given length, which are laid on the bottom of the tank, while in each section of the lash the process described in Example 1 occurs, and when using such a sectional device, the dispersion medium is uniformly distributed over the entire volume of the tank.

 The application of the proposed device can improve the aeration efficiency of the liquid, the presence of threaded couplings allows a set of sections of the desired length for any tank profile, perforation in the form of conical holes allows to achieve the lowest coefficient of air flow in the cross section of the hole, winding a bulk polymer bundle provides an increase in the interlayer space and with a dispersing layer allows you to achieve fine-bubble distribution of the dispersible medium.

 Reducing operating costs and facilitating repair work when driving the working layers of the device provides the use in the proposed device of a protective highly porous sleeve that serves as a dust collector and is easily removable for repair.

Claims (4)

 1. A pneumatic aerator containing a frame in the form of a perforated pipe, a porous sleeve with a dispersing layer mounted on the frame and an intermediate layer between the frame and the sleeve, characterized in that the frame is made with threaded couplings mounted on its ends with special protrusions and with a highly porous protective sleeve placed inside the frame on special protrusions of threaded couplings and made of material with a porosity of 500 to 600 microns by pneumatic extrusion.  2. The aerator according to claim 1, characterized in that the holes of the pipe are conical and arranged in rows with an offset in adjacent rows equal to half the pitch between the holes.  3. The aerator according to claim 1, characterized in that the intermediate layer is made in the form of a three-dimensional bundle installed on the frame by winding in two directions with overlap, the porous sleeve is made by pneumatic extrusion, and the dispersing layer is made of material with a porosity of 50 to 80 microns.  4. The aerator according to claim 1, characterized in that the porous sleeve is made of a polymer network in 3 5 layers, with each layer installed on the frame with a "stocking".

Images