CN107043159B

CN107043159B - Air-lift sludge reflux device suitable for small sewage treatment system

Info

Publication number: CN107043159B
Application number: CN201710283433.6A
Authority: CN
Inventors: 王宝山; 孙秦川; 刘娟; 谭磊
Original assignee: Gansu Zhongxin Environmental Engineering Technology Co ltd; Lanzhou Jiaotong University
Current assignee: Gansu Zhongxin Environmental Engineering Technology Co ltd; Lanzhou Jiaotong University
Priority date: 2017-04-26
Filing date: 2017-04-26
Publication date: 2022-12-02
Anticipated expiration: 2037-04-26
Also published as: CN107043159A

Abstract

The invention discloses an air-lift sludge reflux device suitable for a small sewage treatment system, belonging to the technical field of sewage treatment; it comprises the following steps: the box body is of a square hollow structure, and the bottom of the box body is partially provided with a through hole; the air isolating baffle is positioned on one side of the through opening and is formed by combining a lower baffle and an upper baffle which are spaced and staggered up and down, the lower baffle is hermetically connected with the bottom of the box body and two side walls of the box body, and the upper baffle is hermetically connected with the top of the box body and two side walls of the box body; the air outlet end of the air inlet pipeline is positioned in a space enclosed by the box body and the lower clapboard; the sludge return pipe is connected above one side of the box body through an air duct, and the inlet end of the air duct is positioned in a space enclosed by the upper clapboard and the box body; the invention has the advantages of simple structure, low cost, convenient installation, no need of maintenance during operation, easy control, large sludge lifting capacity and contribution to improving the working efficiency of water lifting treatment.

Description

Air-lift sludge reflux device suitable for small sewage treatment system

Technical Field

The invention relates to the technical field of sewage treatment, in particular to an air-lift sludge reflux device suitable for a small sewage treatment system.

Background

With the development of social economy, environmental problems are increasingly prominent, and particularly, the problem of water environment is most concerned by people. At present, the sewage treatment technology in China enters the rapid development period, and sewage which can be brought into a municipal sewage treatment system is treated by adopting a centralized sewage treatment technology. However, with the rapid development of urbanization, the development of municipal sewage collection systems is relatively delayed, and the development of distributed sewage treatment technologies is rapidly advanced.

The distributed sewage treatment technology mainly adopts an activated sludge method, and the activated sludge technology needs to be provided with a corresponding activated sludge sedimentation tank and a corresponding backflow device. Distributed sewage treatment system water yield is little, and sludge reflux unit running cost is too high, and the fault rate is high, and later stage operation power consumption is great. The air-lift sludge reflux device solves the sludge reflux problem of the biological reaction tank of the small sewage treatment system, has the advantages of no need of an additional sludge reflux pump, investment saving, low operating cost, no need of maintenance in the later period after one-time installation, and the like, and is an economic and effective small sludge reflux technology.

The conventional air lifting device used in the existing small-sized sewage treatment system has small lifting force and low working efficiency.

Disclosure of Invention

The invention aims to provide an air-lift sludge reflux device which has the advantages of simple structure, convenient use, large lifting force and high working efficiency and is suitable for a small sewage treatment system.

In order to achieve the purpose, the invention adopts the technical scheme that:

an air-lift sludge recirculation device suitable for use in small sewage treatment systems, comprising:

the box body is of a square hollow structure, and the bottom of the box body is partially provided with a through hole;

the air isolating baffle is positioned on one side of the through opening and is formed by combining a lower baffle and an upper baffle which are spaced and staggered up and down, the lower baffle is hermetically connected with the bottom of the box body and two side walls of the box body, and the upper baffle is hermetically connected with the top of the box body and two side walls of the box body;

the air outlet end of the air inlet pipeline is positioned in a space enclosed by the box body and the lower clapboard; and

the sludge return pipe is connected above one side of the box body through an air duct, and the inlet end of the air duct is positioned in a space enclosed by the upper clapboard and the box body;

furthermore, the air inlet pipeline is connected to the box body, extends into the box body and is communicated with the tubular aerator in the box body; the tubular aerator can form stable bubbles and supply air to the interior of the box body;

further, the tubular aerator is positioned right above the port; the impact of liquid disturbance on the box body, particularly the impact on the lower partition plate, can be relieved when the gas is sprayed out of the tubular aerator;

further, the tubular aerator is horizontally arranged in the box body, and the distance from the top end of the tubular aerator to the bottom of the box body is smaller than the distance from the lower edge of the upper partition plate to the bottom of the box body; therefore, the tubular aerator can be always positioned below the liquid level in the tank body, and continuous oxygenation of liquid can be facilitated.

The working principle of the invention is as follows: liquid is fully accumulated in the box body before work, the gas is supplied by a gas supply pipeline and explodes to form bubbles through a pipe type aerator, the bubbles quickly float to the top of the box body and gradually accumulate, at the moment, one part of the liquid in the box body is discharged through an opening, the other part of the liquid is discharged into the sludge return pipe through a gas guide pipe, when the liquid level drops to the upper edge of the lower partition plate, the liquid in the space enclosed by the lower partition plate and the box body is continuously discharged through the opening, the liquid in the space clamped by the lower partition plate and the upper partition plate is extruded by air, the liquid level continuously drops, before the liquid level drops to the lower edge of the upper partition plate, the liquid in the space enclosed by the upper partition plate and the box body is extruded to be discharged into the sludge return pipe through the gas guide pipe, when the liquid level in the space clamped by the lower partition plate and the upper partition plate is adjacent to the lower edge of the upper partition plate, partial gas rushes into the liquid space enclosed by the upper partition plate and the box body to form a large flow of bubbles which are quickly lifted to the top of the box body, and intensively rushed into the sludge return pipe, the liquid column in which cuts off bubbles and forms a large pressure difference, the sludge return pipe, the pressure above which can drive the sludge return pipe to discharge, and the sludge is instantly discharge, and the sludge return pipe, and the sludge is used for driving the sludge return pipe to discharge; after the bubbles are formed, the pressure of a gas phase space formed by the box body is temporarily reduced, and a liquid phase space is extruded by the bubbles and then flows into a clamping area between the lower partition plate and the upper partition plate, so that the liquid phase space temporarily sinks over the lower edge of the upper partition plate; when the bubbles are discharged and continuously supplied with air, the liquid level between the lower partition plate and the upper partition plate is again at the critical position of the lower edge of the upper partition plate, so that the next large bubble is formed, and a continuous working process is formed.

The beneficial effects of the invention are:

the invention utilizes the gas-isolating baffle plate to generate larger bubbles, cuts off the liquid column in the sludge return pipe by the bubbles, the bubbles rise and extrude the liquid column at the upper part, pressure difference can be formed after the bubbles are broken, so that the sludge return pipe adsorbs the sludge below, the sludge flows back, the adsorption force of the sludge is improved by the pressure difference, and the work efficiency is improved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

fig. 2 is a schematic top view of the present invention.

Wherein: 1, a box body; 2-through opening; 3-air isolation baffle; 4-a lower baffle plate; 5-an upper partition plate; 6-an air inlet pipeline; 7-a sludge return pipe; 8-a gas-guide tube; 9-pipe type aerator.

Detailed Description

The preferred embodiments of the present invention are described below with reference to the accompanying drawings:

as shown in fig. 1 and 2, an air-lift sludge recirculation apparatus suitable for use in a small-sized sewage treatment system includes: the device comprises a box body 1, an air isolating baffle 3, an air inlet pipeline 6 and a sludge return pipe 8;

the box body 1 is of a square hollow structure, and the bottom of the box body is partially provided with a through opening 2; the through port 2 can be formed in a strip shape and is positioned on one side of the bottom of the box body 1, the through port 2 is mainly used for draining water, the box body 1 can be made of organic glass or hard plastic, and if the box body is made of metal materials, the box body needs to have corrosion resistance;

the air-isolating baffle 3 is positioned on one side of the through opening 2 and is formed by combining a lower baffle 4 and an upper baffle 5 which are spaced and staggered up and down, the lower baffle 4 is hermetically connected with the bottom of the box body 1 and two side walls of the box body 1, and the upper baffle 5 is hermetically connected with the top of the box body 1 and two side walls of the box body 1; the lower partition plate 4 and the upper partition plate 5 are made of materials matched with the box body 1; the lower partition plate 4 and the upper partition plate 5 can be in the same size or different sizes, and the upper edge of the lower partition plate 4 is required to be higher than the lower edge of the upper partition plate 5 in actual manufacturing; the lower partition plate 4 is arranged to prevent unstable influence on the lower edge of the upper partition plate 5 caused by liquid level disturbance of a space enclosed by the lower partition plate 4 and the box body 1 when bubbles are generated, the combination of the lower partition plate 4 and the upper partition plate 5 is used to form a clamping space to provide a stable conveying channel for gas, and meanwhile, the stability of the bubbles generated along the upper partition plate 5 is ensured;

the air outlet end of the air inlet pipeline 6 is positioned in a space enclosed by the box body 1 and the lower clapboard 4; the air inlet pipeline 6 is connected to the box body 1 and extends into the box body 1, and is communicated with the tubular aerator 9 in the box body 1; the tubular aerator 9 is preferably positioned right above the through opening 2, mainly for example, to avoid the influence of liquid disturbance on the stability of the lower partition plate 4 when gas is sprayed out, and to avoid or slow down the vibration of the lower partition plate 4; the tubular aerator 9 is horizontally arranged in the box body 1, the distance from the top end of the tubular aerator to the bottom of the box body 1 is less than the distance from the lower edge of the upper partition plate 5 to the bottom of the box body 1, the tubular aerator 9 is not only used for supplying air, but also used for adding oxygen to liquid, and the distance from the top end of the tubular aerator 9 to the bottom of the box body 1 is less than the distance from the lower edge of the upper partition plate 5 to the bottom of the box body 1, so that the tubular aerator 9 can be ensured to be buried by the liquid level all the time, and the oxygen adding and air supplying are not wrong;

the sludge return pipe 7 is connected above one side of the box body 1 through an air duct 8, and the inlet end of the air duct 8 is positioned in a space enclosed by the upper partition plate 5 and the box body 1; the diameter of the air duct 8 is smaller than that of the sludge return pipe 7, corresponding reinforcing structures can be arranged in the actual manufacturing process, the sludge return pipe 7 and the air duct 8 can be made of organic glass pipes or hard plastic pipes, materials can be selected to be matched with the box body 1, in the invention, the sludge return is carried out by utilizing pressure difference, the lifting capacity is large, so that the sludge return pipe 7 can be provided with different inclination angles to meet the requirements of practical application, and the inclination angle can be controlled to be 45-90 degrees.

When the invention is applied to a distributed small-sized sewage treatment system:

the distributed small-sized sewage treatment system needs to be provided with an aeration tank and a sedimentation tank under the general condition, so that the biodegradation of pollutants is realized in the aeration tank, and the separation of activated sludge is realized in the sedimentation tank. The activated sludge gathered in the sedimentation tank needs to flow back to the aeration tank to continue to perform the biodegradation function.

The device is placed at the bottom of a sedimentation tank, a valve and a gas flowmeter can be arranged on an air inlet pipeline 6 for regulation and control, and the air inlet pipeline is communicated with an external air source, the external air source can be an independent air source or an aeration pipeline in a water system, the lower end of a sludge return pipe 7 is placed in a sludge hopper at the bottom of the sedimentation tank, and the upper end of the sludge return pipe extends out of the liquid level and is connected with the aeration tank; the tubular aerator 9 of the present invention also preferably solves this problem because the sedimentation tank is prone to anoxic conditions.

The invention has simple structure, easy manufacture, low cost, convenient installation, no need of maintenance during operation and easy control, has large sludge lifting capacity in a distributed small-sized sewage treatment system, and is beneficial to improving the working efficiency of water lifting treatment.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention as defined in the following claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the invention should be included in the protection scope of the invention.

Claims

1. The utility model provides an air-lift sludge reflux unit suitable for in small-size sewage treatment system which characterized in that includes:

the box body (1) is of a square hollow structure, and the bottom of the box body is partially provided with a through hole (2);

the air isolating baffle (3) is positioned on one side of the through hole (2) and is formed by combining a lower baffle plate (4) and an upper baffle plate (5) which are spaced and staggered up and down, the lower baffle plate (4) is hermetically connected with the bottom of the box body (1) and two side walls of the box body (1), and the upper baffle plate (5) is hermetically connected with the top of the box body (1) and two side walls of the box body (1);

the air outlet end of the air inlet pipeline (6) is positioned in a space enclosed by the box body (1) and the lower clapboard (4); and

the sludge return pipe (7) is connected above one side of the box body (1) through an air duct (8), and the inlet end of the air duct (8) is positioned in a space enclosed by the upper partition plate (5) and the box body (1);

the air inlet pipeline (6) is connected to the box body (1), extends into the box body (1) and is communicated with the tubular aerator (9) in the box body (1);

the tubular aerator (9) is positioned right above the port (2);

the tubular aerator (9) is horizontally arranged in the tank body (1), and the distance from the top end of the tubular aerator to the bottom of the tank body (1) is less than the distance from the lower edge of the upper partition plate (5) to the bottom of the tank body (1);

the inclination angle of the sludge return pipe (7) is 45-90 degrees.