CN216337205U

CN216337205U - Sludge dewatering system

Info

Publication number: CN216337205U
Application number: CN202122189427.9U
Authority: CN
Inventors: 卜恩朝; 张保成
Original assignee: Beijing Tri High Membrane Technology Co ltd
Current assignee: Beijing Tri High Membrane Technology Co ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2022-04-19
Anticipated expiration: 2031-09-10

Abstract

The utility model discloses a sludge dewatering system, which comprises a biochemical pond, a mud pump, a sludge dewaterer, an air compressor, a filter-pressing water collecting pond and a sludge collecting pond, wherein the sludge dewaterer is a cylinder body, a filter-pressing layer, a membrane filtering layer and a sludge discharging layer are arranged in the cylinder body from top to bottom, the membrane filtering layer is provided with a plurality of microfiltration membrane pipes with two sealed ends, the water outlet of the biochemical pond is communicated with the water inlet of the mud pump, the water outlet of the mud pump is communicated with the water inlet of the sludge dewaterer, the air outlet of the air compressor is communicated with the air inlet of the sludge dewaterer, the water inlet and the air inlet of the sludge dewaterer are both arranged on the filter-pressing layer, the water outlet of the sludge dewaterer is communicated with the side surface of the membrane filtering layer, the water outlet of the sludge dewaterer is communicated with the filter-pressing water collecting pond, and the sludge discharging port of the sludge dewaterer is communicated with the sludge collecting pond. The sludge dewatering system utilizes the characteristic of smooth and hydrophilic membrane surface to separate water by extrusion, so that the water content of the activated excess sludge can be reduced to below 60 percent.

Description

Sludge dewatering system

Technical Field

The utility model relates to the technical field of biological wastewater treatment, in particular to a sludge dewatering system.

Background

The activated sludge process is a biological waste water treating technology, and is mainly a biological waste water treating process with activated sludge as main component. This technique mixes and agitates the wastewater with activated sludge (microorganisms) and aerates to decompose organic contaminants in the wastewater, and biosolids are then separated from the treated wastewater and optionally partially returned to an aeration tank. The sludge activity is reduced after the sludge is used for a period of time, so that the aged sludge needs to be treated, and the sludge is generally dewatered to reach the standard and then landfilled or incinerated in the conventional biochemical sludge treatment method.

The purpose of sludge dewatering is to further reduce the volume of sludge, and facilitate subsequent treatment, disposal and utilization. The sludge dewatering mainly removes capillary water among sludge particles and adsorbed water on the surfaces of the particles. The main method for sludge dehydration is mechanical filtration, which comprises plate-and-frame filter pressing and centrifugation. The plate-and-frame filter pressing method adopts a frame-type sludge dewatering machine, and under a closed state, sludge pumped in by a high-pressure pump is extruded by a plate frame, so that water in the sludge is discharged through filter cloth, and the dewatering purpose is achieved. The centrifugal method is that sludge is fed into a spiral rotating cylinder through the hollow rotating shaft by the spiral rotating cylinder with the hollow rotating shaft, and the sludge is thrown into a cavity of the spiral rotating cylinder under the centrifugal force generated by high-speed rotation. Due to the different specific gravity, solid-liquid separation is formed. The sludge dehydrated by the mechanical method still has strong fluidity, the water content of the sludge is still high and generally is more than 80%, the sludge needs to be deeply dehydrated until the water content is 50-60%, and then the sludge can be buried or burnt, the prior deep dehydration process is to add lime and a flocculating agent for secondary filter pressing, and the other process is to evaporate water vapor in the sludge by adopting a drying process.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model discloses a sludge dewatering system, which comprises a biochemical tank, a slurry pump, a sludge dewatering device, an air compressor, a filter pressing water collecting tank and a sludge collecting tank,

wherein the sludge dehydrator is a cylinder body, a pressure filtration layer, a membrane filtration layer and a sludge discharge layer are arranged in the cylinder body from top to bottom, the membrane filtration layer is provided with a plurality of microfiltration membrane pipes with two sealed ends, a water outlet of the biochemical pond is communicated with a water inlet of the slurry pump through a pipeline, a water outlet of the slurry pump is communicated with a water inlet of the sludge dehydrator through a pipeline, a gas outlet of the air compressor is communicated with a gas inlet of the sludge dehydrator through a pipeline, a water inlet and a gas inlet of the sludge dehydrator are both arranged on the pressure filtration layer,

the delivery port intercommunication of sludge dewaterer is in the side of membrane filtration layer, sludge dewaterer's delivery port passes through pipeline and filter-pressing water collecting pit intercommunication, sludge discharge port of sludge dewaterer sets up on row's mud layer, sludge discharge port passes through pipeline and sludge collecting pit intercommunication.

Optionally, the filtration pore size of the microfiltration membrane tube is 0.1-1.5 um.

Optionally, the sludge discharge layer is conical.

Optionally, the sludge dewatering device further comprises a cleaning water tank, a water outlet of the cleaning water tank is communicated to a water inlet of the sludge dewatering device through a cleaning pump and a pipeline, a sludge discharging layer of the sludge dewatering device is communicated with a cleaning return pipeline, and the cleaning return pipeline is communicated to the cleaning water tank.

Optionally, the cleaning water tank is also communicated to the water inlet of the biochemical pool through a cleaning pump and a pipeline.

Optionally, the filter pressing water collecting tank is also communicated to a water inlet of the biochemical tank through a water outlet suction pump and a pipeline.

Optionally, the filter pressing water returned to the biochemical tank from the filter pressing water collection tank and the cleaning water returned to the biochemical tank from the cleaning water tank are merged and then returned to the biochemical tank through the same pipeline.

Optionally, a valve is provided on each line.

The utility model utilizes the characteristics of smooth and hydrophilic membrane surface according to the combination form of sludge and water, most of interstitial water, surface adsorbed water and free-state water are separated out by the extrusion of a slurry pump, water is further discharged by the extrusion of compressed air, and the separated sludge is discharged by the compressed air, so that the water content of the activated excess sludge can be reduced to be below 60 percent by one step, and the activated excess sludge can be directly buried or burnt.

Drawings

The above features and technical advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments thereof taken in conjunction with the accompanying drawings.

FIG. 1 is a schematic configuration diagram showing a sludge dewatering system according to an embodiment of the present invention;

FIG. 2 is a schematic view showing the structure of a sludge dehydrator according to an embodiment of the present invention.

1. Biochemical pool 2, mud pump

3. Mud pump outlet control valve 4 and sludge dehydrator

5. Compressed air control valve 6 and air compressor

7. Water outlet suction pump 8 and water outlet control valve

9. Sludge dehydrator water control valve 10, filter pressing water collecting pool

11. Control valve for returning cleaning water in sludge collection tank 12 to cleaning water tank

13. Cleaning water outlet control valve 14 and cleaning water backflow biochemical tank control valve

15. Cleaning pump 16 and cleaning water tank

17. A sludge discharge quick-opening valve 18 and a microfiltration membrane tube.

Detailed Description

The embodiments of the present invention will be described below with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, or combinations thereof, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.

The sludge dewatering system comprises a biochemical pool 1, a mud pump 2, a sludge dewatering device 4, an air compressor 6, a filter pressing water collecting pool 10 and a sludge collecting pool 11, wherein the sludge dewatering device 4 is a cylinder, a filter pressing layer 41, a membrane filtering layer 42 and a sludge discharging layer 43 are arranged in the cylinder from top to bottom, and the membrane filtering layer is provided with a plurality of microfiltration membrane pipes 18 with two ends sealed in a pouring mode. For example, the sludge dehydrator 4 of this embodiment is made of 304 stainless steel, and has a diameter of 500mm and a cylinder length of 1400mm, the upper layer of the cylinder is a filtering layer with a height of 200mm, the middle layer is a membrane filtering layer with a diameter of 1000mm, two ends of a microfiltration membrane tube are sealed by casting, the diameter of the membrane tube is 25mm, the support layer is made of HDPE (high density polyethylene), the filter layer is made of PVDF (polyvinylidene fluoride), the filtering pore diameter is 0.1-1.5um, and the lower layer is a conical sludge discharge layer with a height of 100 mm.

The water outlet of the biochemical pool 1 is communicated with the water inlet of a mud pump 2, the water outlet of the mud pump 2 is communicated with the water inlet of a sludge dehydrator 4, and a mud pump outlet control valve 3 is arranged on a pipeline through which the mud pump 2 is communicated with the water inlet of the sludge dehydrator 4.

The air outlet of the air compressor 6 is communicated with the air inlet of the sludge dehydrator 4, and a compressed air control valve 5 is arranged on a pipeline of the air compressor 6 communicated to the air inlet of the sludge dehydrator 4. The water inlet and the air inlet of the sludge dehydrator 4 are both arranged on the filter-pressing layer, the water outlet of the sludge dehydrator 4 is communicated with the side surface of the membrane filtering layer, and the water outlet of the sludge dehydrator is communicated with the filter-pressing water collecting pool 10 through a sludge dehydrator water outlet control valve 9. The sludge discharge port of the sludge dehydrator 4 is arranged at the bottom end of the sludge dehydrator, and is communicated with the sludge collecting tank 11 through a sludge discharge quick-opening valve 17.

When the activity of the sludge in the biochemical pool 1 subsides and needs to be cleaned and replaced, the sludge in the biochemical pool 1 is deposited and pumped out through the sludge pump 2, the outlet control valve 3 of the sludge pump is opened, the sludge is sent into the sludge dehydrator 4, the outlet control valve 9 of the sludge dehydrator is opened, the mud water is extruded and separated through the microfiltration membrane tube 18 in the sludge dehydrator 4 by utilizing the pressure of the sludge pump 2, and the own water and the adsorption water in the sludge penetrate through the microfiltration membrane tube 18 and are collected into the filter pressing water collecting pool 10 from the side direction. When the mud pump 2 extrudes water and obviously descends, the mud pump 2 and the water outlet control valve 9 of the sludge dehydrator are closed, the compressed air control valve 5 is opened, the air compressor 6 is started to pressurize the sludge dehydrator 4 to 0.8MPa by air, the water outlet condition of the sludge dehydrator 4 is observed, when the water outlet stops, the water outlet control valve 9 of the sludge dehydrator is closed, the sludge discharge quick-opening valve 17 is opened to pressurize the sludge dehydrator, the air pressure is increased to 1.2MPa, and the sludge in the sludge dehydrator 4 is pressed into the sludge collection pool 11 through the gap between the microfiltration membrane tubes 18, so that the sludge dehydration operation is completed. The water content of the sludge can be detected, and the sludge is transported out for landfill or incineration after being qualified.

Further, the filter pressing water collecting tank 10 is communicated to a water inlet of the biochemical tank 1 through a water outlet suction pump and a water outlet control valve. The filter pressing water in the filter pressing water collecting tank 10 is pumped out by the water outlet suction pump 7, the water outlet control valve 8 is opened, and the filter pressing water is sent into the biochemical tank 1.

Further, the sludge dehydrator also comprises a cleaning water tank 16, and a water outlet of the cleaning water tank 16 is communicated to a water inlet of the sludge dehydrator 4 through a cleaning pump 15 and a cleaning water outlet control valve 13. The lower end of the sludge dehydrator 4 is also provided with a cleaning return pipeline which returns to the cleaning water tank through cleaning water and is communicated to the upper end of the cleaning water tank through a control valve 12. The sludge and organic matter adsorbed by the microfiltration membrane tube 18 are washed and cleaned by circulating flushing by injecting cleaning water into the sludge dehydrator 4, and the cleaning water is returned to the cleaning water tank 16.

Furthermore, the water outlet of the cleaning water tank 16 is communicated with the water inlet of the biochemical tank 1 through the cleaning pump 15 and the cleaning water backflow biochemical tank control valve 14. After the washing, washing water may be pumped into the biochemical tank 1 by the washing pump 15. And the filter pressing water returned to the biochemical tank 1 by the filter pressing water collecting tank 10 can be merged with the cleaning water returned to the biochemical tank 1 by the cleaning water tank 16 and then returned to the biochemical tank 1 through the same pipeline.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sludge dewatering system is characterized by comprising a biochemical tank, a slurry pump, a sludge dewatering device, an air compressor, a filter pressing water collecting tank and a sludge collecting tank,

2. The sludge dewatering system of claim 1, wherein the microfiltration membrane tube has a filtration pore size of 0.1-1.5 um.

3. The sludge dewatering system of claim 1, wherein the sludge layer is conical.

4. The sludge dewatering system of claim 1, further comprising a wash water tank, wherein a water outlet of the wash water tank is connected to a water inlet of the sludge dewatering device through a wash pump and a pipeline, and a wash return pipeline is connected to a sludge discharge layer of the sludge dewatering device and is connected to the wash water tank.

5. The sludge dewatering system of claim 4, wherein the wash water tank is further communicated to the water inlet of the biochemical tank by a wash pump and a pipeline.

6. The sludge dewatering system of claim 5,

the pressure filtration water collecting tank is also communicated to a water inlet of the biochemical tank through a water outlet suction pump and a pipeline.

7. The sludge dewatering system according to claim 6, wherein the press-filtered water returned from the press-filtered water collection tank to the biochemical tank is merged with the cleaning water returned from the cleaning water tank to the biochemical tank and then returned to the biochemical tank through the same pipeline.

8. The sludge dewatering system of claim 1, wherein a valve is provided on each conduit.