CN217265395U - Municipal sludge low-pressure deep dehydration device - Google Patents
Municipal sludge low-pressure deep dehydration device Download PDFInfo
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- CN217265395U CN217265395U CN202220198544.3U CN202220198544U CN217265395U CN 217265395 U CN217265395 U CN 217265395U CN 202220198544 U CN202220198544 U CN 202220198544U CN 217265395 U CN217265395 U CN 217265395U
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Abstract
The utility model relates to the field of municipal sewage treatment, in particular to a municipal sludge low-pressure deep dehydration device, which provides a scheme for reducing the water content of sludge to be below 60% under the condition of low pressure, and comprises a sludge concentration tank, a sludge conditioning concentration tank and a diaphragm filter press; municipal sludge is conveyed to a sludge conditioning concentration tank by a sludge lifting pump after primary concentration in a sludge concentration tank, the sludge conditioning concentration tank conditions the sludge by using composite iron salt, PAM and alkali liquor and then secondarily concentrates the sludge by adopting gravity, and then the secondarily concentrated sludge is conveyed to a membrane filter press by a sludge feeding pump, and the sludge is mechanically filter-pressed and secondarily squeezed and dewatered by the membrane filter press to form a sludge cake.
Description
Technical Field
The utility model relates to a municipal administration sewage treatment field relates to sludge treatment system, specifically is a municipal administration mud low pressure degree of depth dewatering device.
Background
In recent years, the municipal engineering business of China is rapidly developed under the background of steady development of social economy. Municipal sludge treatment is a very important link in municipal engineering work. In view of environmental protection, energy conservation and the like, the key point is to do the treatment work of municipal sludge. Therefore, on the basis of the existing municipal sludge treatment theory, research and development of a novel sludge deep dehydration technology are very necessary.
The main disposal mode of the dewatered municipal sludge is landfill. And the regulation in the pollution control Standard of the municipal solid waste landfill: when the water content of the treated sludge of the domestic sewage treatment plant is less than 60 percent, the treated sludge can enter a domestic garbage landfill for landfill treatment. Therefore, the adoption of more effective deep dehydration technology is very meaningful in municipal sludge treatment.
Disclosure of Invention
The utility model discloses aim at solving the technical problem who carries out degree of depth dehydration to municipal sludge, provide a municipal sludge low pressure degree of depth dewatering device.
The utility model provides a technical means that its technical problem adopted is: a municipal sludge low-pressure deep dehydration device comprises a sludge concentration tank, a pump pit, a sludge lifting pump, a composite iron salt dosing device, a PAM dosing device, an alkali dosing device, a sludge conditioning concentration tank, a sludge feeding pump, a membrane filter press, a sludge hopper and a screw conveyer; the sludge lifting pump is arranged in the pump pit, the inlet end of the sludge lifting pump extends into the sludge concentration tank through a pipeline, and the outlet end of the sludge lifting pump is connected to the feed inlet of the sludge conditioning concentration tank through a sludge pipeline; the composite iron salt dosing device adds the composite iron salt into a sludge pipeline from a sludge lifting pump to a sludge conditioning and concentrating tank through a dosing pump and a pipeline mixer; the PAM dosing device adds PAM medicament into a sludge pipeline from a sludge lifting pump to a sludge conditioning and concentrating tank through a dosing pump and a pipeline mixer; the alkali dosing device adds alkali liquor into the sludge conditioning and concentrating tank through a dosing pump; the inlet end of the sludge feeding pump is connected into the sludge conditioning and concentrating tank through a pipeline, the outlet end of the sludge feeding pump is communicated with the feeding hole of the membrane filter press through a sludge conveying pipeline, and a pressure transmitter is arranged on the sludge conveying pipeline from the sludge feeding pump to the membrane filter press; the sludge hopper is positioned below the membrane filter press, and the screw conveyor is positioned below the sludge hopper.
The sludge concentration tank is used for carrying out primary concentration on the municipal sludge, and the water content of the sludge after the primary concentration can be reduced to about 98 percent. The mud elevator pump is located the pump hole, guarantees that mud can gravity flow in the mud elevator pump in the sludge thickening pond (mud liquid level YL is higher than the mud elevator pump in the mud thickening pond in figure 1). The sludge lifting pump conveys the primary concentrated sludge in the sludge concentration tank to a sludge conditioning concentration tank, and the composite iron salt and PAM medicament are sequentially and respectively added into the conveying pipeline. The composite iron salt dosing device adds composite iron salt into a sludge pipeline from a sludge lifting pump to a sludge conditioning and concentrating tank through a dosing pump and a pipeline mixer, and the PAM dosing device adds PAM medicament into the sludge pipeline from the sludge lifting pump to the sludge conditioning and concentrating tank through the dosing pump and the pipeline mixer. The alkali dosing device adds alkali liquor into a central cylinder of the sludge conditioning concentration tank through a dosing pump. The sludge conditioning and concentrating tank is used for conditioning and secondarily concentrating the sludge by adopting composite iron salt and PAM medicament, and the pH value of the sludge is adjusted to 6-9 by adopting alkali liquor. After the sludge is conditioned and secondarily concentrated, the water content of the sludge is reduced to 90-95%, and then the sludge is conveyed to a membrane filter press through a sludge feeding pump. The membrane filter press performs filter pressing dehydration on the sludge to form a mud cake, and the mud cake falls into a sludge hopper and is conveyed to a sludge transport vehicle through a screw conveyor.
Preferably, the composite iron salt is a novel iron salt, the main component of the composite iron salt is polymeric ferric sulfate or polymeric ferric chloride, and the composite iron salt has better sludge dewatering effect than the ferric chloride adopted in the traditional technology.
Preferably, the PAM agent employs a non-ionic polyacrylamide.
Preferably, the alkali liquor is sodium hydroxide solution, compared with the traditional technology which adopts quick lime, the method has 2 advantages of reducing the sludge yield and adjusting the pH value of the sludge to 6-9.
Furthermore, the sludge conditioning and concentrating tank adopts a vertical flow sedimentation tank and is provided with a central cylinder, a baffle plate, a conical sludge hopper and an overflow pipe. The sludge conditioning and concentrating tank adopts epoxy resin to carry out corrosion prevention on the inner wall and the pipeline, and can prevent the corrosion of the agent to the sludge conditioning and concentrating tank.
Preferably, the contact part of the sludge feeding pump and the sludge adopts 316L material or other materials for preventing iron salt corrosion.
Further, the alkali dosing device comprises a dissolving medicine box, a stirring device extending into the dissolving medicine box and a dosing pump; an ultrasonic liquid level meter is installed at the top of the sludge conditioning and concentrating tank, a pH on-line monitoring meter is installed on the side wall of the sludge conditioning and concentrating tank, and the liquid level and the pH value of the sludge conditioning and concentrating tank are respectively monitored; the signal output ends of the pH on-line monitoring meter and the ultrasonic liquid level meter are connected with an industrial personal computer together, and the signal output end of the industrial personal computer is connected with the stirring device of the alkali dosing device and the control end of the dosing pump; the sludge lifting pump is controlled by an industrial personal computer to start and stop.
The ultrasonic wave level gauge can monitor the liquid level of the sludge conditioning concentration tank, automatic control is realized under the control of the industrial personal computer, the sludge feeding pump stops running when the liquid level of the sludge conditioning concentration tank is low, and the sludge lifting pump stops running when the liquid level of the sludge conditioning concentration tank is high. The pH on-line monitoring meter can monitor the pH in the sludge conditioning and concentrating tank and can control the start and stop of the alkali dosing device according to a pH signal.
Further, the working pressure of the sludge feeding pump is 0.6-0.8 MPa. The sludge feeding pump is provided with a pressure transmitter at the outlet and a return pipeline, the running frequency of the sludge feeding pump can be controlled and guaranteed through the pressure signal of the pressure transmitter, and the pressure of the pipeline at the outlet of the sludge feeding pump is guaranteed to be maintained at 0.6-0.8 MPa.
Preferably, the working pressure in the filter chamber of the membrane filter press is less than or equal to 0.8MPa, the filter pressing process of the membrane filter press comprises mechanical filter pressing and secondary pressing, and the mechanical filter pressing process mainly utilizes the mechanical pressure (0.6-0.8 MPa) generated by a sludge feeding pump to carry out filter pressing dehydration; the secondary squeezing mainly utilizes high-pressure water or high-pressure air (less than or equal to 0.8 MPa) to squeeze the diaphragm to carry out secondary dehydration on the sludge. The dewatered sludge forms sludge cakes with the water content less than or equal to 60 percent, and the sludge cakes are temporarily stored in a sludge hopper and then conveyed to a sludge transport vehicle through a screw conveyor.
The utility model has the advantages that: 1. under the condition of low pressure, the water content of the sludge is reduced to below 60 percent; 2. the height of the secondary concentration tank is increased, the secondary concentration effect is enhanced, the water content of sludge is reduced, and the dehydration time of the membrane filter press is shortened; 3. and the automatic operation of the system is realized by adopting various instruments.
Drawings
FIG. 1 is a process flow diagram of the municipal sludge low-pressure deep dehydration technology of the utility model.
In the figure: 1. a sludge concentration tank; 2. a pump pit; 3. a sludge lift pump; 4. a composite iron salt dosing device; 5, PAM dosing device; 6. an alkali dosing device; 7. a pipeline mixer; 8. a sludge conditioning and concentrating tank; 9. an ultrasonic liquid level meter; 10, a pH on-line monitor; 11. a sludge feed pump; 12. a pressure transmitter; 13. a membrane filter press; 14. a sludge hopper; 15. a screw conveyor.
Detailed Description
The technical solutions in the embodiments of the present invention will be described below clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Example 1
As shown in fig. 1, this example 1 provides a municipal sludge low-pressure deep dehydration technology, which includes, as shown in fig. 1, a sludge concentration tank 1, a pump pit 2, a sludge lift pump 3, a composite iron salt dosing device 4, a PAM dosing device 5, an alkali dosing device 6, a sludge conditioning concentration tank 8, a sludge feeding pump 11, a membrane filter press 13, a sludge hopper 14, and a screw conveyor 15; the sludge lifting pump 3 is arranged in the pump pit 2, the inlet end of the sludge lifting pump 3 extends into the sludge concentration tank 1 through a pipeline, and the outlet end of the sludge lifting pump 3 is connected to the feed inlet of the sludge conditioning concentration tank 8 through a sludge pipeline; the composite iron salt dosing device 4 adds the composite iron salt into a sludge pipeline from the sludge lifting pump 3 to the sludge conditioning and concentrating tank 8 through a dosing pump and a pipeline mixer 7; the PAM dosing device 5 adds PAM medicament into a sludge pipeline from the sludge lifting pump 3 to the sludge conditioning and concentrating tank 8 through a dosing pump and a pipeline mixer 7; the alkali dosing device 6 adds alkali liquor into the sludge conditioning and concentrating tank 8 through a dosing pump; the inlet end of the sludge feeding pump 11 is connected to the sludge conditioning and concentrating tank 8 through a pipeline, the outlet end of the sludge feeding pump 11 is communicated with the feeding hole of the membrane filter press 13 through a sludge conveying pipeline, and a pressure transmitter 12 is arranged on the sludge conveying pipeline from the sludge feeding pump 11 to the membrane filter press 13; the sludge hopper 14 is positioned below the membrane filter press 13, and the screw conveyor 15 is positioned below the sludge hopper 14.
Example 2
The sludge lift pump 3 and the sludge feed pump 11 include, but are not limited to, a screw pump, a centrifugal pump, and a plunger pump. The sludge concentration tank 1 is used for carrying out primary concentration on municipal sludge, and the concentration mode adopts the methods including but not limited to gravity concentration, mechanical concentration and air flotation concentration.
Example 3
The composite iron salt dosing device 4 comprises a dissolving medicine box, a stirring device and a dosing pump, and the composite iron salt dosing device 4 is in linkage control with the sludge lift pump 3; PAM charge device 5 contains and is equipped with dissolving medical kit, agitating unit and the dosing pump of cationic polyacrylamide, and PAM charge device 5 and sludge elevator pump 3 coordinated control.
Example 4
The alkali dosing device 6 comprises a dissolving medicine box, a stirring device and a dosing pump; the top of the sludge conditioning and concentrating tank 8 is provided with an ultrasonic liquid level meter 9, the side wall of the sludge conditioning and concentrating tank is provided with a pH on-line monitoring meter 10, and the liquid level and the pH value of the sludge conditioning and concentrating tank 8 are respectively monitored; the signal output ends of the pH on-line monitoring meter 10 and the ultrasonic liquid level meter 9 are connected with an industrial personal computer together, and the sludge feeding pump 11 is controlled by the ultrasonic liquid level meter 9, the pressure transmitter 12 and the opening of a return pipeline valve. The signal output end of the industrial personal computer is connected with the stirring device of the alkali dosing device 6 and the control end of the dosing pump; the sludge lifting pump 3 is controlled by an industrial personal computer to start and stop.
Example 5
The pressure signal output end of the pressure transmitter 12 is connected with the signal input end of the industrial personal computer; the signal output end of the industrial personal computer is also connected with the control end of the sludge feeding pump 11; the pipeline is divided into two branches after passing through a pressure transmitter 12, one branch is communicated to a membrane filter press 13, and the other branch is connected to a feed inlet of a sludge conditioning and concentrating tank 8 through a return pipeline; the reflux pipeline is provided with a valve which is controlled by an industrial personal computer to open and close.
Example 6
The sludge conditioning and concentrating tank 8 adopts a vertical flow sedimentation tank and comprises a central cylinder, a conical sludge hopper connected below the central cylinder and an overflow pipe arranged on the side wall of the central cylinder; the feed inlet of the sludge conditioning and concentrating tank 8 is positioned at the top, and a baffle plate positioned below the feed inlet is fixed in the central cylinder, so that sludge entering the feed inlet at the top can be dispersed conveniently; the inlet pipeline of the sludge feeding pump 11 extends to the bottom of the conical sludge hopper of the sludge conditioning and concentrating tank 8.
Example 7
Epoxy resin is adhered to the inner wall of the sludge conditioning and concentrating tank 8; the part of the sludge feeding pump, which is in contact with the sludge, is made of 316L material.
In specific implementation, the sludge concentration tank 1 is used for concentrating municipal sludge once, and the water content of the sludge after primary concentration can be reduced to about 98%. The sludge lifting pump 3 is positioned in the pump pit 2, and can ensure that the sludge in the sludge concentration tank 1 can flow into the sludge lifting pump 3 by gravity. The sludge lifting pump 3 conveys the primary concentrated sludge in the sludge concentration tank 1 to a sludge conditioning concentration tank 8, and composite iron salt and PAM medicament are sequentially and respectively added into a conveying pipeline. The alkali dosing device 6 adds alkali liquor into a central cylinder of the sludge conditioning and concentrating tank 8 through a dosing pump. The sludge conditioning and concentrating tank is used for conditioning and secondarily concentrating the sludge by adopting composite iron salt and PAM medicament, and the pH value of the sludge is adjusted to 6-9 by adopting alkali liquor. After the sludge is conditioned and secondarily concentrated, the water content of the sludge is reduced to 90-95%, and then the sludge is conveyed to a membrane filter press 13 through a sludge feeding pump 11. The membrane filter press 13 filters and dehydrates the sludge to form a mud cake, and the mud cake falls into a sludge hopper 14 and is conveyed to a sludge transport vehicle through a screw conveyor 15.
As shown in fig. 1, the sludge conditioning thickening tank 8 has two functions: firstly, the sludge is conditioned, and secondly, the sludge is concentrated. The sludge conditioning agent adopts composite iron salt, PAM and alkali liquor. The function of the composite iron salt medicament is as follows: firstly, cell walls of microorganisms in the sludge are quickly destroyed, bound water in the sludge is released, and adsorbed water and intracellular water are absorbed, so that the sludge dewatering effect is greatly improved; and secondly, the flocculant is used for aggregating particles in the sludge to form flocs and promoting solid-liquid separation. The PAM agent has the function of accelerating aggregation and sedimentation of flocs in the sludge. The function of the alkali liquor is to adjust the pH value of the sludge in the sludge conditioning and concentrating tank 8. The sludge conditioning and concentrating tank 8 adopts a vertical flow sedimentation tank, is provided with a central cylinder, a baffle plate, a conical sludge hopper and an overflow pipe, and adopts gravity to carry out secondary concentration. The sludge conditioning and concentrating tank adopts epoxy resin to carry out corrosion prevention on the inner wall and the pipeline, and can prevent the corrosion of the agent to the sludge conditioning and concentrating tank.
Specifically, the composite iron salt medicament adopts a novel iron salt, the main component is polymeric ferric sulfate or polymeric ferric chloride, and the iron salt has better sludge dewatering and flocculating effects through optimized proportioning. The PAM medicament adopts nonionic polyacrylamide, and has better effect of conditioning sludge and assisting coagulation. The alkali liquor adopts sodium hydroxide solution, and has two advantages compared with quicklime: firstly, the sludge yield is reduced, and secondly, the pH of the sludge can be adjusted to 6-9.
After being conditioned and secondarily concentrated, the sludge is conveyed to a membrane filter press 13 through a sludge feeding pump 11, and the rated working pressure of the sludge feeding pump 11 is 0.6-0.8 MPa. And a pressure transmitter is arranged in a sludge conveying pipeline from the sludge feeding pump 11 to the membrane filter press 13, and a sludge return pipeline is arranged. The sludge feeding pump 11 controls the operation frequency according to the signal of the pressure transmitter and the opening of the valve of the sludge return pipeline, and the pressure of the outlet of the sludge feeding pump 11 can be kept at 0.6-0.8 MPa. The filter pressing process of the membrane filter press 13 is divided into mechanical filter pressing and secondary pressing, and the working pressure of a filter chamber is maintained below 0.8MPa during filter pressing. When in mechanical filter pressing, the sludge is dehydrated by the mechanical pressure provided by the sludge feeding pump 11, and the running time is about 2-3 h; and during secondary pressing, the filter chamber is pressed by high-pressure water or high-pressure air pressure, secondary dehydration is carried out on the sludge, and the operation time is 0.5-1 h. The dewatered sludge forms a sludge cake in the filter chamber, after the pressure of the membrane filter press 13 is released, the sludge cake is unloaded to a sludge hopper 14 for temporary storage, and then is conveyed to a sludge transport vehicle through a screw conveyor 15. The operation period of the sludge low-pressure deep dehydration technology is about 4 hours.
Claims (10)
1. A municipal sludge low-pressure deep dehydration device is characterized by comprising a sludge concentration tank (1), a pump pit (2), a sludge lifting pump (3), a composite iron salt dosing device (4), a PAM dosing device (5), an alkali dosing device (6), a sludge conditioning concentration tank (8), a sludge feeding pump (11), a membrane filter press (13), a sludge hopper (14) and a screw conveyor (15); the sludge lifting pump (3) is arranged in the pump pit (2), the inlet end of the sludge lifting pump (3) extends into the sludge concentration tank (1) through a pipeline, and the outlet end of the sludge lifting pump (3) is connected to the feed inlet of the sludge conditioning concentration tank (8) through a sludge pipeline; the composite iron salt dosing device (4) adds the composite iron salt into a sludge pipeline from the sludge lifting pump (3) to the sludge conditioning and concentrating tank (8) through a dosing pump and a pipeline mixer (7); the PAM dosing device (5) adds a PAM medicament into a sludge pipeline from the sludge lifting pump (3) to the sludge conditioning and concentrating tank (8) through a dosing pump and a pipeline mixer (7); the alkali dosing device (6) adds alkali liquor into the sludge conditioning and concentrating tank (8) through a dosing pump; the inlet end of the sludge feeding pump (11) is connected to the sludge conditioning and concentrating tank (8) through a pipeline, the outlet end of the sludge feeding pump (11) is communicated with the feeding hole of the membrane filter press (13) through a sludge conveying pipeline, and a pressure transmitter (12) is arranged on the sludge conveying pipeline from the sludge feeding pump (11) to the membrane filter press (13); the sludge hopper (14) is positioned below the membrane filter press (13), and the screw conveyor (15) is positioned below the sludge hopper (14).
2. The municipal sludge low-pressure deep dewatering device according to claim 1, wherein the sludge lifting pump (3) and the sludge feeding pump (11) are screw pumps or centrifugal pumps or plunger pumps.
3. The municipal sludge low-pressure deep dewatering device according to claim 1, wherein the composite iron salt dosing device (4) comprises a dissolving tank, a stirring device and a dosing pump, and the composite iron salt dosing device (4) is in linkage control with the sludge lift pump (3).
4. The municipal sludge low-pressure deep dewatering device according to claim 1, characterized in that the PAM dosing device (5) comprises a dissolving tank filled with cationic polyacrylamide, a stirring device and a dosing pump, and the PAM dosing device (5) is in linkage control with the sludge lift pump (3).
5. The municipal sludge low-pressure deep dehydration device according to any one of claims 1 to 4, characterized in that the alkali dosing device (6) comprises a dissolving tank, a stirring device and a dosing pump; the top of the sludge conditioning and concentrating tank (8) is provided with an ultrasonic liquid level meter (9), the side wall of the sludge conditioning and concentrating tank is provided with an online pH monitoring meter (10), and the liquid level and the pH value of the sludge conditioning and concentrating tank (8) are respectively monitored; the signal output ends of the pH on-line monitoring meter (10) and the ultrasonic liquid level meter (9) are connected with an industrial personal computer together, and the signal output end of the industrial personal computer is connected with the control ends of a stirring device and a dosing pump of the alkali dosing device (6); the sludge lifting pump (3) is controlled by an industrial personal computer to start and stop.
6. The municipal sludge low-pressure deep dehydration device according to claim 5, wherein the pressure signal output end of the pressure transmitter (12) is connected with the signal input end of an industrial personal computer; the signal output end of the industrial personal computer is also connected with the control end of the sludge feeding pump (11); the pipeline is divided into two branches after passing through the pressure transmitter (12), one branch is communicated to the membrane filter press (13), and the other branch is connected to a feed inlet of the sludge conditioning and concentrating tank (8) through a return pipeline; the reflux pipeline is provided with a valve which is controlled by an industrial personal computer to open and close.
7. The municipal sludge low-pressure deep dehydration device according to claim 6, wherein the sludge conditioning concentration tank (8) is a vertical sedimentation tank comprising a central cylinder, a conical sludge hopper connected below the central cylinder and an overflow pipe arranged on the side wall of the central cylinder.
8. The municipal sludge low-pressure deep dehydration device according to claim 7, wherein the feed inlet of the sludge conditioning concentration tank (8) is located at the top, and a baffle plate located below the feed inlet is fixed in the central cylinder.
9. The municipal sludge low-pressure deep dehydration device according to claim 7, wherein the inlet pipeline of the sludge feeding pump (11) extends to the bottom of the tapered sludge hopper of the sludge conditioning and thickening tank (8).
10. The municipal sludge low-pressure deep dehydration device according to claim 7 characterized in that the inner wall of the sludge conditioning concentration tank (8) is adhered with epoxy resin; the part of the sludge feeding pump, which is in contact with the sludge, is made of 316L material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220198544.3U CN217265395U (en) | 2022-01-25 | 2022-01-25 | Municipal sludge low-pressure deep dehydration device |
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| CN202220198544.3U CN217265395U (en) | 2022-01-25 | 2022-01-25 | Municipal sludge low-pressure deep dehydration device |
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| CN217265395U true CN217265395U (en) | 2022-08-23 |
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