CN110787494A

CN110787494A - Inclined tube or inclined plate sedimentation tank with automatic backwashing system

Info

Publication number: CN110787494A
Application number: CN201911158820.2A
Authority: CN
Inventors: 李建; 王磊; 王海梅; 马小蕾; 华海洁; 白筱丽; 苏蕊
Original assignee: North China Municipal Engineering Design and Research Institute Co Ltd
Current assignee: North China Municipal Engineering Design and Research Institute Co Ltd; CSCEC Aecom Consultant Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-02-14

Abstract

The invention belongs to the technical field of water supply and reclaimed water treatment, and particularly relates to an inclined tube or inclined plate sedimentation tank with an automatic back flushing system; comprises a sedimentation tank, a perforated water collecting tank and a water collecting channel; the device also comprises an aeration main pipe, a perforated aeration pipe and a blower; a plurality of perforated aeration pipes are uniformly distributed below the inclined pipes or the inclined plates and are connected with an aeration main pipe, and the aeration main pipe is connected with an outlet of a blower. The aeration main pipe is connected with a plurality of aeration branch pipes, the outlets of the aeration branch pipes are connected with perforated aeration pipes, and electric butterfly valves are arranged on the aeration branch pipes. The air blower provides an air source, the air passes through the aeration main pipe to the perforated aeration pipe, the bubbles released by the perforated aeration pipe generate vibration to strip the sludge on the inclined pipe or the inclined plate, the stripped sludge is partially re-precipitated, and partially discharged along with water flow. The problems that the inclined pipe is periodically washed by manual high-pressure water, single-cell water cut-off and precipitation are needed, the washing time is long, the labor intensity of workers is high, the influence on the quality of discharged water is large and the like are solved.

Description

Inclined tube or inclined plate sedimentation tank with automatic backwashing system

Technical Field

The invention belongs to the technical field of water supply and reclaimed water treatment, and particularly relates to an inclined tube or inclined plate sedimentation tank with an automatic backwashing system.

Background

Inclined tubes and inclined plate sedimentation tanks are commonly used for water supply and reclaimed water treatment sedimentation processes; the inclined tube (plate) sedimentation tank utilizes the shallow tank theory and has the characteristics of high sedimentation efficiency, short retention time, small tank volume and small occupied area; the defects are that the adaptability to the inlet water turbidity and the suspended solid concentration (SS concentration) is poor, and the inclined tube (plate) is easy to be blocked by untimely flushing, so that the outlet water turbidity or SS is unstable.

At present, the inclined tube (plate) sedimentation tanks of water supply plants and reclaimed water plants are generally washed by regular manual high-pressure water, single-lattice water cut-off and precipitation are needed, the washing time is long, the labor intensity of workers is high, and the stability of the quality of discharged water is greatly influenced. Further, when the inlet water turbidity or the SS concentration is high, the frequency of the inclined tube (plate) washing increases.

Disclosure of Invention

Aiming at the defects that the labor intensity of manual high-pressure water washing of an inclined tube (plate) sedimentation tank is high, the water washing is easy to block in time, and the effluent turbidity or SS is unstable; the invention aims to provide an inclined tube or inclined plate sedimentation tank with an automatic back washing system.

The technical scheme adopted by the invention for solving the technical problems is as follows: an inclined tube or inclined plate sedimentation tank with an automatic back flushing system comprises a sedimentation tank provided with inclined tubes or inclined plates, a perforated water collecting tank and a water collecting channel; the method is characterized in that: the device also comprises an aeration main pipe, a perforated aeration pipe and a blower; a plurality of perforated aeration pipes are uniformly distributed below the inclined pipes or the inclined plates and are connected with an aeration main pipe, and the aeration main pipe is connected with an outlet of a blower.

The aeration main pipe is connected with a plurality of aeration branch pipes, the outlets of the aeration branch pipes are connected with perforated aeration pipes, and electric butterfly valves are arranged on the aeration branch pipes.

The sedimentation tank provided by the invention is cleaned by air on line, production stop operation is not needed, automatic control is realized during washing, manpower consumption is not needed, and the frequency of manual washing is greatly reduced; when the inlet water turbidity and the SS concentration change greatly, the flushing frequency is automatically adjusted to ensure that the outlet water turbidity or SS reaches the standard stably.

The invention provides an air source by a blower, controls a flushing area by a matched electric butterfly valve and the like, leads the air to pass through an aeration main pipe to a perforated aeration pipe arranged below an inclined pipe or an inclined plate, and peels off sludge on the inclined pipe or the inclined plate by generating vibration by bubbles released by the perforated aeration pipe, wherein the peeled sludge is partially re-precipitated and partially discharged along with water flow. The sedimentation tank provided by the invention has the advantages that the sedimentation tank is flushed by regions and keeps higher flushing frequency, the sludge amount discharged along with water is less, and therefore, the quality of the precipitated effluent is not obviously influenced in the cleaning process. The problems that the inclined pipe or the inclined plate needs to be manually washed by high-pressure water at regular intervals, water supply and precipitation are needed in a single grid, the washing time is long, the labor intensity of workers is high, the influence on the quality of discharged water is large and the like are solved.

Drawings

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

fig. 2 is a sectional view taken along line a-a of fig. 1.

In the figure: 1-blower, 2-elastic joint, 3-outlet silencer, 4-aeration main pipe, 5-check valve, 6-electric butterfly valve, 7-manual butterfly valve, 8-perforated aeration pipe, 9-inclined pipe or inclined plate, 10-sedimentation tank, 11-perforated water collecting tank, and 12-water collecting channel.

Detailed Description

As shown in fig. 1 and 2: an inclined tube or inclined plate sedimentation tank with an automatic back flushing system comprises a sedimentation tank 10 provided with an inclined tube or an inclined plate 9, a perforated water collecting tank 11 and a water collecting channel 12; the device also comprises an aeration main pipe 4, a perforated aeration pipe 8 and a blower 1; a plurality of perforated aeration pipes 8 are uniformly distributed below the inclined pipe or the inclined plate 9, the perforated aeration pipes 8 are connected with the aeration main pipe 4, and the aeration main pipe 4 is connected with the outlet of the air blower 1. The blower 1 is a Roots blower, an outlet of the Roots blower is sequentially provided with an elastic joint 2 and an outlet silencer 3, and the outlet silencer 3 is connected with an aeration main pipe 4.

The outlet of the aeration main pipe 4 is connected with a plurality of aeration branch pipes, the outlets of the aeration branch pipes are connected with perforated aeration pipes 8, electric butterfly valves 6 are installed on the aeration branch pipes, and the electric butterfly valves 6 are used for controlling the washing area. The invention is perfected; the check valve 5 is arranged on the aeration branch pipe and at the inlet end of the electric butterfly valve 6, and the check valve 5 can prevent the liquid in the sedimentation tank 10 from flowing back to the blower 1; manual butterfly valve 7 is installed to the exit end of electric butterfly valve 6, and manual butterfly valve 7 normally opens in normal operating, when electric butterfly valve 6 breaks down, the operation of 7 control system of accessible manual butterfly valve.

When the sedimentation tank operates, the roots blower, the electric ball valve and the like can be started periodically at the same time, the blower provides an air source, air runs to the perforated aeration pipe arranged below the inclined pipe or the inclined plate through the main aeration pipe and the branch aeration pipe, and bubbles released by the perforated aeration pipe generate vibration to peel off sludge on the inclined pipe or the inclined plate, so that the effect of automatically washing the inclined pipe or the inclined plate is achieved. The peeled sludge part can be settled again in the sedimentation tank, and the part can flow to a perforated water collecting tank and a water collecting channel which are arranged on the upper part of the sedimentation tank in sequence along with water and is discharged together with the outlet water.

In order to keep the sludge discharged along with the water flow in the cleaning process not to have obvious influence on the effluent quality of the sedimentation tank, the operation can be carried out by regional flushing and a larger flushing frequency is kept.

Claims

1. An inclined tube or inclined plate sedimentation tank with an automatic back flushing system comprises a sedimentation tank provided with inclined tubes or inclined plates, a perforated water collecting tank and a water collecting channel; the method is characterized in that: the device also comprises an aeration main pipe (4), a perforated aeration pipe (8) and a blower (1); a plurality of perforated aeration pipes (8) are uniformly distributed below the inclined pipe or the inclined plate (9), the perforated aeration pipes (8) are connected with an aeration main pipe (4), and the aeration main pipe (4) is connected with an outlet of the air blower (1).

2. The inclined tube or inclined plate sedimentation tank with the automatic back flushing system as claimed in claim 1, wherein: the outlet of the aeration main pipe (4) is connected with a plurality of aeration branch pipes, the outlets of the aeration branch pipes are connected with perforated aeration pipes (8), and electric butterfly valves (6) are installed on the aeration branch pipes.

3. The inclined tube or inclined plate sedimentation tank with the automatic back flushing system as claimed in claim 2, wherein: a check valve (5) is arranged on the aeration branch pipe and at the inlet end of the electric butterfly valve (6); the outlet end of the electric butterfly valve (6) is provided with a manual butterfly valve (7).

4. A pipe chute or plate settler with automatic backwash system as claimed in claim 3, wherein: the blower (1) is a Roots blower, the outlet of the Roots blower is sequentially provided with an elastic joint (2) and an outlet silencer (3), and the outlet silencer (3) is connected with an aeration main pipe (4).