CN211752702U

CN211752702U - Sludge discharge system of secondary sedimentation tank

Info

Publication number: CN211752702U
Application number: CN201922148502.XU
Authority: CN
Inventors: 卢东昱; 李伟; 麻倩; 刘丽君; 马效贤
Original assignee: Beijing Enfi Environmental Protection Technology Co ltd
Current assignee: Beijing Enfi Environmental Protection Technology Co ltd
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-10-27
Anticipated expiration: 2029-12-04

Abstract

The utility model discloses a two heavy ponds arrange mud system belongs to sewage treatment technical field. A sludge discharge system of a secondary sedimentation tank mainly comprises a sludge return well, a sludge discharge header pipe, a sleeve valve, a sludge return pipe, a blow-down pipe, a pump barrel, a gate valve, a blow-down well and a drain pipe. The utility model discloses avoided the defect that traditional two heavy ponds row mud evacuation well can not be emptied completely, established comparatively good operation, operation and maintenance operational environment, saved the occupation of land space of traditional valve well simultaneously, reduced the excavation degree of depth under the foundation ditch in the work progress, reduced the construction degree of difficulty and risk, shortened construction cycle.

Description

Sludge discharge system of secondary sedimentation tank

Technical Field

The utility model relates to a sewage treatment technical field, especially a two heavy ponds mud discharging system.

Background

The secondary sedimentation tank is an important component of an activated sludge water treatment system, is an important unit for realizing sludge-water separation, clarifies mixed liquid, concentrates sludge and provides activated sludge for a biological tank. The quality of the working effect directly influences the effluent quality of subsequent treatment units and the whole process of a sewage plant, and also influences the indexes of sludge concentration, sludge settlement ratio, dissolved oxygen and the like of a biological pond.

In the production and operation process of a sewage plant, the secondary sedimentation tank needs to be subjected to sludge discharge, emptying and maintenance periodically or when equipment breaks down suddenly. In general, the secondary sedimentation tank emptying well comprises the following three parts (see the attached figure 1):

firstly, a sludge return well: sludge at the bottom of the secondary sedimentation tank enters a sludge return well through a sludge discharge header pipe, the sludge reflux ratio is adjusted by adjusting the opening degree of a manual screw hoist of a sleeve valve in the sludge return well and combining the adjustment of a sludge return pump of the biological tank, and the sludge flows to a sludge return pump station through a sludge return pipe;

II, valve well: a gate valve is arranged in the valve well, and under the normal condition, the valve is in a closed state. When the secondary sedimentation tank needs to be emptied for maintenance, the secondary sedimentation tank is stopped from feeding water, a maintenance worker goes into the secondary sedimentation tank through the ladder stand in the valve well, the gate valve is opened, sludge flows into the emptying pipe through the tee joint in the sludge backflow well, and flows through the valve well and the subsequent emptying well in sequence. In addition, the valve well is internally provided with a water collecting pit, so that the collection and the discharge of rainwater or other sewage in the well are realized, and the soaking of the valve is avoided.

Thirdly, emptying the well: and the sludge flows into the emptying well through the emptying pipe and finally flows into a sewage pipe of the plant area through a drain pipe in the middle of the emptying well, so that emptying of the secondary sedimentation tank is realized.

However, the conventional secondary sedimentation tank sludge discharge emptying well has the following disadvantages:

the secondary sedimentation tank cannot be completely emptied, and needs to be emptied by combining other pumps, so that the energy consumption is increased, and

the operation, the operation and the maintenance of the sewage plant are not facilitated;

the sludge discharge emptying well comprises three parts, so that the occupied area is large, and the construction excavation and concrete use amount are large;

thirdly, the depth of the sludge return well is large, a deep foundation pit needs to be excavated in the construction process, and the construction period and the construction difficulty are increased;

and fourthly, the distance between the drainage pipe opening of the emptying well and the bottom of the well is larger, and more residual sludge cannot be completely discharged.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the main technical problem who solves provides a two heavy ponds row mud system simplifies row mud system architecture, can empty the heavy pond of two completely, reduces simultaneously and builds the depth of digging under area and the foundation ditch, reduces the construction degree of difficulty and risk, shortens construction cycle, reduces the excess sludge when arranging mud.

In order to achieve the above object, the utility model discloses a technical scheme is: the utility model provides a two heavy ponds mud discharging system, its characterized in that includes mud return well, row's mud house steward, sleeve valve, mud back flow, blow-down pipe, pump barrel, gate valve, blow-down well, drain pipe, mud return downhole side wall mounting the mud back flow, mud back flow one end stretches out the mud return well outside, the sleeve valve is vertical to be installed in the mud return well, the sleeve valve lower extreme passes sludge return well bottom, the sleeve valve lower extreme connects a vertical tee bend, tee bend one end is connected row's mud house steward, the tee bend other end connect the horizontal direction the blow-down pipe, the blow-down pipe other end is located blow-down well bottom and with vertical direction the pump barrel intercommunication, the pump barrel passes blow-down well bottom, pump barrel side direction opening sets up the gate valve, the gate valve is located in the blow-down well, the drain pipe is installed on the side wall of the emptying well, the end part of the drain pipe, which is positioned in the emptying well, is lower than the gate valve, and the other end of the drain pipe extends out of the emptying well and is communicated with an external plant area drain pipe.

Preferably, the sludge return well and the emptying well are vertically arranged in parallel and close to each other, and the bottom of the sludge return well and the bottom of the emptying well are positioned on the same plane.

Preferably, the sludge return pipe is connected with an external sludge return pump station.

Preferably, a blind plate is mounted at the top end of the pump cylinder.

Preferably, an axial flow pump seat ring is arranged at the bottom of the pump cylinder, an axial flow pump is placed on the seat ring, and the pump cylinder of the axial flow pump is laterally opened and connected with the gate valve.

Preferably, a submersible pump is placed at the bottom of the pump cylinder, and a water outlet pipe of the submersible pump extends out of the pump cylinder and is communicated with a sewage pipe of a plant area.

Preferably, an extension bar is installed on the gate valve.

The utility model has the advantages that: through a two heavy ponds row mud system, can realize two heavy ponds and totally empty, thereby reduce the construction of valve well and save two heavy ponds row mud system construction area, reduce the excavation degree of depth under the foundation ditch, reduced the construction degree of difficulty and risk, shortened construction cycle, reduced surplus mud.

Drawings

FIG. 1 is a schematic structural diagram of a sludge discharge system of a traditional secondary sedimentation tank;

the parts in the drawings are numbered as follows: 101-drain pipe, 102-sump pit, 103-gate valve, 104-blow-down pipe, 105-mud discharge header pipe, 106-tee joint, 107-sludge return pipe, 108-sleeve valve port lowest position, 109-sleeve valve port highest position, 110-sludge return well, 111-manual screw hoist, 112-sleeve valve, 113-valve well, 114-blow-down well and 115-ground;

FIG. 2 is a schematic structural view of a secondary sedimentation tank sludge discharge system of the present invention;

the parts in the drawings are numbered as follows: 201-axial flow pump, 202-pump barrel;

FIG. 3 is a schematic diagram of the right side cross-sectional structure of the sludge discharge system of the secondary sedimentation tank of the present invention;

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Fig. 2 is a schematic structural diagram of a secondary sedimentation tank sludge discharge system, which comprises a drainage pipe 101, a gate valve 103, an emptying pipe 104, a sludge discharge header pipe 105, a tee 106, a sludge return pipe 107, a lowest port position 108 of a sleeve valve, a highest port position 109 of the sleeve valve, a sludge return well 110, a manual screw hoist 111, a sleeve valve 112, an emptying well 114, the ground 115, an axial flow pump 201 and a pump barrel 202.

An extension bar is installed on the gate valve 103 to facilitate technicians to open the gate valve 103 without entering the emptying well.

As can be seen from FIG. 2, the sludge recirculation well 110 and the emptying well 114 are closely adjacent and vertically arranged in parallel, and the bottom of the sludge recirculation well 110 and the bottom of the emptying well 114 are positioned on the same plane.

A sludge return pipe 107 is arranged on the side wall of the lower part of the sludge return well 110, one end of the sludge return pipe 107 extends out of the sludge return well 110 and is connected with an external sludge return pump station, a sleeve valve 112 is vertically arranged in the sludge return well 110, the lower end of the sleeve valve 112 penetrates through the bottom of the sludge return well 110, the lower end of the sleeve valve 112 is connected with a vertical tee 106, one end of the tee 106 is connected with a sludge discharge main 105, the other end of the tee 106 is connected with a horizontal emptying pipe 104, the other end of the emptying pipe 104 is positioned below the bottom of the emptying well 114 and is connected with a vertical pump barrel 202, the pump barrel 202 penetrates through the bottom of the emptying well 114, the top end of the pump barrel 202 is provided with a flange and a flange blind plate, the top opening of the pump barrel 202 is sealed through the flange blind plate, a gate valve 103 is arranged on the side opening of the pump barrel 202, the gate valve 103 is, the water discharge pipe 103 extends out of the emptying well 114 to be communicated with an external sewage treatment plant area water discharge pipe.

The pump barrel 202 is designed differently depending on the type of pump selected for sludge evacuation. For example, when the axial flow pump 201 is used for discharging mud, a seat ring of the axial flow pump needs to be arranged at the bottom of the pump cylinder 202, and if a submersible pump is used for discharging mud, the seat ring is not arranged at the bottom of the pump cylinder 202.

When the sewage treatment system normally operates, sludge in the secondary sedimentation tank enters the sleeve valve 112 through the sludge discharge main pipe 105, the sludge return flow is controlled by adjusting the opening degree of the sleeve valve 112, and the sludge returns to the sludge return pump room through the sludge return pipe 107 in the sludge return well 110.

When the secondary sedimentation tank needs to be overhauled and emptied, firstly opening a gate valve 103 in an empty well 114, enabling sludge in the secondary sedimentation tank to flow through an emptying pipe 104 and the gate valve 103 in sequence, automatically flowing into the empty well 114, and further collecting to a sewage pipe of a sewage treatment plant through a drain pipe 101 in the emptying well;

when the liquid level in the pump cylinder is reduced to be below the gate valve 103, opening a flange blind plate at the top end of the pump cylinder 202, hanging the axial flow pump 201 on an axial flow pump seat ring of the pump cylinder 202, connecting the pump cylinder with the gate valve 103, closing the flange blind plate at the top end of the pump cylinder 202, opening the axial flow pump 201, allowing residual sludge to flow into the emptying well 114 through a lateral opening of the pump cylinder to the gate valve 103, and finally, allowing residual sludge to flow into a sewage pipe of a sewage treatment plant through a drain pipe 101 port of the emptying well 114;

or when the liquid level in the pump cylinder is reduced to be below the flange blind plate at the top end of the pump cylinder 202, the flange blind plate at the top end of the pump cylinder 202 is opened, the axial flow pump 201 is hung on an axial flow pump seat ring of the pump cylinder 202, the pump cylinder is connected with the gate valve 103, the flange blind plate at the top end of the pump cylinder 202 is closed, the axial flow pump 201 is started, sludge is discharged into the emptying well 114 through the opening of the lateral side of the pump cylinder to the gate valve 103, and then is converged into a sewage pipe of a sewage treatment plant through the drain pipe 101, so that the purpose of quickly emptying the secondary sedimentation tank is.

And when the liquid level in the pump cylinder is reduced to be below the flange blind plate at the top end of the pump cylinder 202, the flange blind plate at the top end of the pump cylinder 202 is opened, a submersible pump is hung, and a water outlet pipe of the submersible pump is connected to a sewage pipe of a sewage treatment plant. And closing the gate valve 103, starting the submersible pump, and pumping the sludge into a sewage pipe of a sewage treatment plant by a water outlet pipe of the submersible pump, thereby realizing the purpose of quickly emptying the secondary sedimentation tank.

The utility model discloses an use, wholly improve mud return well and unloading well, can empty the secondary sedimentation pond of unloading completely, thereby reduce the construction area of two sedimentation ponds row mud system construction of saving of valve well, reduce the excavation degree of depth under the foundation ditch, reduced the construction degree of difficulty and risk, shortened construction cycle, reduced the construction cost, reduce surplus mud, improved the efficiency of row mud system.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the same principle as the present invention.

Claims

1. The utility model provides a two heavy ponds mud discharging system, its characterized in that includes mud return well, row's mud house steward, sleeve valve, mud back flow, blow-down pipe, pump barrel, gate valve, blow-down well, drain pipe, mud return downhole side wall mounting the mud back flow, mud back flow one end stretches out the mud return well outside, the sleeve valve is vertical to be installed in the mud return well, the sleeve valve lower extreme passes sludge return well bottom, the sleeve valve lower extreme connects a vertical tee bend, tee bend one end is connected row's mud house steward, the tee bend other end connect the horizontal direction the blow-down pipe, the blow-down pipe other end is located blow-down well bottom and with vertical direction the pump barrel intercommunication, the pump barrel passes blow-down well bottom, pump barrel side direction opening sets up the gate valve, the gate valve is located in the blow-down well, the drain pipe is installed on the side wall of the emptying well, the end part of the drain pipe, which is positioned in the emptying well, is lower than the gate valve, and the other end of the drain pipe extends out of the emptying well and is communicated with an external plant area drain pipe.

2. The secondary sedimentation tank sludge discharge system according to claim 1, wherein the sludge recirculation well and the emptying well are vertically arranged in close proximity and in parallel, and the bottom of the sludge recirculation well and the bottom of the emptying well are located on the same plane.

3. The secondary sedimentation tank sludge discharge system of claim 1 wherein the sludge return pipe is connected to an external sludge return pump station.

4. The secondary sedimentation tank sludge discharge system of claim 1, wherein a blind plate is mounted on the top end of the pump barrel.

5. The secondary sedimentation tank sludge discharge system according to claim 4, wherein an axial flow pump seat ring is provided at the bottom of the pump cylinder, an axial flow pump is placed on the seat ring, and the pump cylinder of the axial flow pump is laterally opened and connected with the gate valve.

6. The secondary sedimentation tank sludge discharge system of claim 4 wherein a submersible pump is placed at the bottom of the pump barrel, and a water outlet pipe of the submersible pump extends out of the pump barrel and is communicated with a sewage pipe of a plant area.

7. The secondary sedimentation tank sludge discharging system according to any one of claims 1 to 6, wherein an extension bar is installed on the gate valve.