Conditioning system for centrifugally dewatered sludge

Abstract

The utility model relates to the technical field of sludge treatment, in particular to a conditioning system for centrifugal dewatered sludge. The system comprises a first conveying device, a medicament adding and mixing device, a stirring device, a second conveying device, an ultrasonic reaction device, a third conveying device and a plate-and-frame filter press which are connected in sequence, wherein the first conveying device is used for conveying sludge into the agent adding and mixing device, the agent adding and mixing device is used for conveying an added agent and the sludge to the stirring device, and the stirring device is used for mixing and stirring the agent and the sludge and conveying the mixture to the second conveying device; the second conveying device is used for conveying the sludge to the ultrasonic reaction device for reaction treatment, and the sludge is conveyed to the plate-and-frame filter press through the third conveying device for squeezing and sludge discharging. The sludge conditioning difficulty can be reduced, meanwhile, the sludge treatment efficiency is improved, the input cost is reduced, and the sludge discharging stability is improved.

Description

Technical Field

[0001] The present application relates to the technical field of sludge treatment, and in particular to a conditioning system for centrifugal dewatered sludge. Background Art

[0002] Influenced by the policy requirements and economic and technical capabilities at the time, many domestic sewage treatment plants only considered centrifugal dewatering processes during design and construction, and the moisture content of the sludge after dehydration was usually around 78%~80%.

[0003] With the increasing requirements and costs of sludge treatment and disposal across the globe, further deep dehydration of centrifugally dewatered sludge to a moisture content below 60% is required. Among various deep dehydration processes, high-pressure plate and frame filter pressing is widely used due to its low energy consumption, low cost, and simple operation. However, since the dewatered sludge is in a semi-solid state, mixing it with chemicals is difficult. It often needs to be diluted to a moisture content of 95%-97% before adding chemicals for conditioning, which consumes large amounts of reclaimed or tap water. Plate and frame filter pressing also produces a large amount of highly concentrated filtrate that requires treatment. Furthermore, centrifugally dewatered sludge requires the addition of large amounts of PAM (polyacrylamide, a non-ionic polymer flocculant) during the dehydration process, and typically requires a certain period of storage (such as transportation and buffering) before entering the deep dehydration stage. This makes sludge conditioning difficult, inefficient, and costly. Consequently, after dilution and conditioning with conventional chemical agents, the sludge has a high moisture content and unstable sludge production. Utility Model Content

[0004] In order to overcome the defects and shortcomings of the prior art, the present application provides a conditioning system for centrifugal dewatered sludge, which can reduce the difficulty of sludge conditioning, while improving sludge treatment efficiency, reducing input costs and improving sludge output stability.

[0005] Specifically, an embodiment of the present invention provides a conditioning system for centrifugal dewatered sludge, which adopts the following technical solutions:

[0006] A conditioning system for centrifugal dewatered sludge, comprising: a first conveying device, a chemical dosing and mixing device, a stirring device, a second conveying device, an ultrasonic reaction device, a third conveying device, and a plate and frame filter press connected in sequence; wherein, the first conveying device is used to convey the sludge to the chemical dosing and mixing device, the chemical dosing and mixing device is used to convey the input chemical and the sludge to the stirring device together, the stirring device is used to mix and stir the chemical and the sludge, and convey them to the second conveying device, the second conveying device is used to convey the sludge to the ultrasonic reaction device for reaction treatment, and then convey it to the plate and frame filter press via the third conveying device to squeeze out the sludge.

[0007] By adopting the above technical solution, the sludge treatment process can be optimized by setting up closely connected steps of conveying, mixing, stirring, ultrasonic reaction, and squeezing. Furthermore, by introducing a chemical dosing and mixing device to inject chemicals, hot water, and ultrasonic waves, and then performing a combined ultrasonic-thermal-chemical conditioning reaction, the chemical input can be reduced while achieving a full reaction between the chemical and the sludge, thereby helping to improve sludge treatment efficiency, reduce input costs, and enhance sludge stability.

[0008] Optionally, the medicine dosing and mixing device is provided with a solid medicine conveying component and a mixing component, wherein the solid medicine conveying component, the mixing component and the hot water conveying component are provided in sequence.

[0009] By adopting the above technical solution, setting up a solid medicine conveying member can facilitate the delivery of solid medicine, and setting up the solid medicine conveying member, mixing member and hot water conveying member in sequence can ensure that the medicine and hot water can be fully mixed and act on the sludge.

[0010] Optionally, the medicine dosing and mixing device is further provided with a liquid medicine conveying member, which is located between the solid medicine conveying member and the mixing member.

[0011] By adopting the above technical solution, the solid agent conveying member and the liquid agent conveying member are simultaneously provided on the agent adding and mixing device, and agents in different states can be flexibly selected for addition according to the properties of the sludge.

[0012] Optionally, a conditioning system for centrifugal dewatered sludge further includes: a water heating element for connecting to the hot water conveying element.

[0013] By adopting the above technical solution, the water heating element is connected to the hot water conveying element, which can provide a stable hot water supply for the chemical dosing and mixing device, ensure the mixing effect of hot water and chemical, and promote sludge wall breaking, making it easier to condition the sludge in conjunction with the ultrasonic reaction to improve the quality of sludge treatment.

[0014] Optionally, a conditioning system for centrifugal dewatered sludge further includes: a buffer device located between the ultrasonic reaction device and the third conveying device.

[0015] By adopting the above technical solution, the buffer device can adjust the rhythm of sludge treatment, avoid blockages or excessive delivery during the treatment process, and thus ensure the stability and continuity of the entire system. The buffer device can also serve as a temporary storage area for sludge, providing a stable sludge supply for the subsequent sludge extraction step.

[0016] Optionally, the ultrasonic reaction device is a pipeline ultrasonic device.

[0017] By adopting the above technical solution and using a pipeline ultrasonic device, the disassembly and assembly of the ultrasonic device can be facilitated, and the ultrasonic treatment of the sludge can be effectively performed, thereby further improving the dewatering effect of the sludge.

[0018] Optionally, the ultrasonic reaction device is provided with a plurality of ultrasonic probe placement holes and a sludge output pipe.

[0019] By adopting the above technical solution, the setting of multiple ultrasonic probe placement holes can facilitate operators to select ultrasonic probes of different sizes and place them in the ultrasonic probe placement holes based on parameters such as the diameter of the connecting pipe, flow rate, and solid content of the sludge inlet, thereby improving the sludge treatment efficiency.

[0020] Optionally, both the cache device and the stirring device are provided with a stirrer.

[0021] By adopting the above technical solution, agitators are provided in both the stirring device and the buffer device, which can simultaneously stir and buffer the sludge, thereby improving treatment efficiency. In addition, the combined use of the stirring device and the buffer device can also prevent sludge sedimentation and blockage during the treatment process.

[0022] Optionally, the second conveying device and the third conveying device are both sludge screw pumps.

[0023] By adopting the above technical solution, the second conveying device and the third conveying device are both set as sludge screw pumps, which can realize the extraction and transportation of sludge.

[0024] Optionally, a double helix is ​​provided in the mixing element.

[0025] By adopting the above technical solution, a double helix is ​​provided in the mixing element, which can ensure that the reagent and hot water can be fully mixed with the sludge, thereby further improving the mixing effect.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The closely linked steps of conveying, mixing, stirring, ultrasonic reaction, and squeezing can optimize the sludge treatment process. The introduction of a chemical dosing and mixing device to inject chemicals, hot water, and ultrasonic waves, followed by an ultrasonic-thermal-chemical conditioning reaction, can reduce chemical input while achieving a full reaction between chemicals and sludge, thereby improving sludge treatment efficiency, reducing input costs, and enhancing sludge output stability.

[0028] 2. The solid agent conveying parts and liquid agent conveying parts are simultaneously provided on the agent dosing and mixing device, so that agents in different states can be flexibly selected for input according to the properties of the sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the deep dehydration process of centrifugal dewatering sludge in the existing related technology;

[0030] Figure 2 This is a schematic diagram of a conditioning system for centrifugal dewatered sludge disclosed in one embodiment of the present application;

[0031] Figure 3 for Figure 2 The diagram shows an execution flow layout of a conditioning system for centrifugal dewatered sludge;

[0032] Figure 4 for Figure 3 The schematic diagram of the operation process of a conditioning system for centrifugal dewatered sludge is shown;

[0033] Figure 5 for Figure 2 Another schematic diagram of the execution process layout of a conditioning system for centrifugal dewatered sludge is shown;

[0034] Figure 6 for Figure 5 The figure shows a schematic diagram of the operating process of a conditioning system for centrifugal dewatered sludge.

[0035] Description of reference numerals:

[0036] 10. First conveying device; 20. Chemical dosing and mixing device; 21. Solid chemical conveying element; 22. Liquid chemical conveying element; 23. Mixing element; 24. Hot water conveying element; 30. Stirring device; 40. Second conveying device; 50. Ultrasonic reaction device; 51. Ultrasonic probe placement hole; 52. Sludge output pipeline; 60. Buffer device; 70. Third conveying device; 80. Plate and frame filter press; 90. Water heating element. DETAILED DESCRIPTION

[0037] The terms used in the following examples of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "above," "the," and "this" are intended to include plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in this application refers to and encompasses any and all possible combinations of one or more of the listed items.

[0038] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more.

[0039] See also Figure 1 In the prior art, deep dehydration of centrifugal dewatered sludge generally adopts the methods of unloading, dilution, chemical conditioning and plate and frame pressing.

[0040] Among them, unloading and dilution adopt a batch method, which takes a lot of time. Taking the dilution of 15 tons of sludge at a time as an example, about 60 cubic meters of clean water (recycled water or tap water) need to be added. The entire unloading and dilution process takes more than 70 minutes, which is a long time. In large-scale production, it is necessary to equip more external unloading pools, buffer pools and other structures, which occupy a large area and have a high investment cost. At the same time, it will also cause the unloading vehicles to wait for a long time.

[0041] Furthermore, after dilution, centrifugal dewatered sludge enters the sludge conditioning system for chemical conditioning. Existing sludge conditioning systems primarily rely on chemical conditioning, where organic or inorganic conditioning agents are added and then stirred to complete the reaction. This simple conditioning process relies on a single controllable parameter, with the only operational parameters being the agent dosage and stirring time. High organic matter content in sludge and excessive amounts of polyacrylamide (PAM) added at the front end can make it difficult to achieve a stable and effective sludge discharge. This often requires extending the plate and frame pressing time to reduce the moisture content of the sludge, but this is ineffective and results in a significant decrease in plate and frame production capacity.

[0042] Therefore, the existing related technologies have the problems of low efficiency, high cost and poor mud discharge effect. Therefore, it is necessary to design a conditioning system for centrifugal dewatered sludge to solve the above problems. For details, please see the following:

[0043] See also Figure 2 The embodiment of the present application discloses a conditioning system for centrifugal dewatered sludge, including: a first conveying device 10, a reagent adding and mixing device 20, a stirring device 30, a second conveying device 40, an ultrasonic reaction device 50, a buffer device 60, a third conveying device 70 and a plate and frame filter press 80 connected in sequence.

[0044] The first conveying device 10 is used to convey the sludge to the reagent dosing and mixing device 20. The first conveying device 10 and the reagent dosing and mixing device 20 can be connected by a hose so that the sludge can pass through.

[0045] The agent dosing and mixing device 20 is sequentially provided with a solid agent conveying part 21, a liquid agent conveying part 22, a mixing part 23 and a hot water conveying part 24. The solid agent conveying part 21 and the liquid agent conveying part 22 can flexibly select solid agents and / or liquid agents based on the properties of the sludge (such as the organic matter content).

[0046] A double helix is ​​provided inside the mixing element 23, and the hot water conveying element 24 is used to input a certain amount of hot water after the addition of the agent. Combined with the double helix mixing of the mixing element 23, the moisture content of the mixed sludge can be controlled at 90%~92%, thereby greatly reducing the filtrate generated during the subsequent dehydration of the plate and frame filter press 80, and conveying the hot water, agent and sludge to the stirring device 30 together can promote further mixing reaction of the three.

[0047] In this embodiment, the conditioning system further includes a water heating element 90 connected to the hot water delivery element 24 to ensure that the hot water delivery element 24 outputs stable hot water to the medicine dosing and mixing device 20 .

[0048] The water heater 90 can be a water-source heat pump or an air-source heat pump, utilizing heat from the tailwater or air within the water purification plant to heat the water, thereby saving energy. The hot water temperature is determined based on the sludge properties and process requirements, typically ranging from 50°C to 75°C. Furthermore, the amount of hot water added to the sludge should be controlled to maintain a moisture content of 90% to 92% after mixing. This significantly reduces the amount of filtrate produced during subsequent dehydration in the plate and frame filter press 80.

[0049] An agitator is provided in the stirring device 30, which can fully mix the hot water, chemicals and sludge when rotating, and can temporarily store the mixed sludge to adjust the rhythm of sludge treatment and provide a stable sludge supply for the subsequent second conveying device 40, thereby avoiding blockage or excessive conveyance during the treatment process, thereby ensuring the stability and continuity of the entire system.

[0050] The second conveying device 40 is a sludge screw pump, which extracts sludge from the stirring device 30 and conveys the sludge to the ultrasonic reaction device 50 through the rotation of the internal screw.

[0051] The ultrasonic reaction device 50 is a pipeline-type ultrasonic device, with multiple ultrasonic probe placement holes 51 at its upper end and a sludge discharge pipe 52 at its lower end. The multiple ultrasonic probe placement holes 51 allow the operator to select ultrasonic probes of different sizes based on parameters such as the connecting pipe diameter, flow rate, and solid content of the incoming sludge, thereby improving sludge treatment efficiency. The pipeline-type ultrasonic reaction device 50 facilitates the installation and removal of the ultrasonic probes.

[0052] The buffer device 60, located between the ultrasonic reaction device 50 and the third conveying device 70, serves as a temporary storage area for sludge. This helps adjust the sludge processing rhythm and provide a stable sludge supply for subsequent plate and frame filter press 80 discharge, preventing blockages or excessive sludge delivery during the processing process, thereby ensuring the stability and continuity of the entire system. The buffer device 60 and the stirring device 30 can have the same structure, that is, they also have an internal agitator to provide on-demand stirring during the buffering process.

[0053] The third conveying device 70 has the same structure as the second conveying device 40 and can be a sludge screw pump or a plunger pump. It extracts sludge from the buffer device 60 and conveys the sludge to the plate and frame filter press 80 through the rotation of the internal screw.

[0054] The plate and frame filter press 80 is used to reduce the moisture content of the sludge and squeeze it out. It is worth mentioning that the embodiments of the present application combine multiple conditioning methods such as chemicals, hot water, and ultrasonic waves to ensure that the moisture content of the sludge discharged from the plate and frame filter press 80 is stable at below 55% or even lower.

[0055] See also Figure 3 and Figure 4 In this embodiment, the following steps can be used for adjustment based on the system layout:

[0056] S1, the first conveying device 10 conveys the sludge to the reagent dosing and mixing device 20;

[0057] S2, adding the agent from the solid agent conveying member 21 or the liquid agent conveying member 22 into the sludge;

[0058] S3, start the water heating element 90 to transport the hot water from the hot water transport element 24 to the sludge, and then transport it to the stirring device 30 for stirring;

[0059] S4, the second conveying device 40 transfers the sludge in the stirring device 30 to the ultrasonic reaction device 50 through the ultrasonic probe placement hole 51 for ultrasonic reaction;

[0060] S5, the sludge is transported to the buffer device 60 through the sludge output pipe 52 of the ultrasonic reaction device 50 for buffering;

[0061] S6. The third conveying device 70 extracts the sludge in the buffer device 60 to the plate and frame filter press 80 for squeezing out the sludge.

[0062] Also, see Figure 5 and Figure 6 In this embodiment, if the organic matter content in the sludge is high, the following steps can be used for conditioning based on the system layout:

[0063] S11, the first conveying device 10 conveys the sludge to the reagent dosing and mixing device 20;

[0064] S12, start the water heating element 90 to transport the hot water from the hot water transporting element 24 to the sludge, and then transport it to the stirring device 30 for stirring;

[0065] S13, the second conveying device 40 transfers the sludge in the stirring device 30 to the ultrasonic reaction device 50 through the ultrasonic probe placement hole 51 for ultrasonic reaction;

[0066] S14, the sludge is transported to the buffer device 60 through the sludge output pipe 52 of the ultrasonic reaction device 50 for buffering;

[0067] S15, adding a solid medicine or a liquid medicine into the buffer device 60 for stirring and mixing;

[0068] S16 , the third conveying device 70 extracts the sludge in the buffer device 60 to the plate and frame filter press 80 for squeezing out the sludge.

[0069] Thus, the above examples illustrate two operation processes for sludge conditioning, which are of course not limited here. The order of sludge conditioning can be adjusted based on the properties of the sludge to ensure better sludge discharge effect.

[0070] It should be noted that the embodiments of the present application are not limited to the conditioning of centrifugal dewatered sludge, but can also be used for sludge with a moisture content of 75-85% after dehydration by equipment such as a screw press dehydrator and a high-pressure belt dehydrator.

[0071] In summary, the conditioning system for centrifugal dewatered sludge disclosed in the embodiment of the present application can optimize the sludge treatment process by setting up closely connected conveying, mixing, stirring, ultrasonic reaction and squeezing out the sludge. And after introducing the reagent adding and mixing device 20 to input the reagent and hot water, an ultrasonic-thermal-chemical combined conditioning reaction is carried out, which can reduce the input of the reagent while achieving a full reaction between the reagent and the sludge, thereby helping to improve the sludge treatment efficiency, reduce the input cost and improve the stability of the sludge output; and it can achieve the change from the traditional dilution of the sludge to a water content of 95%-97% to the dilution of the sludge to a water content of 90%~92%, thereby reducing the addition of water and achieving the effect of saving resources. In addition, a solid reagent conveying part 21 and a liquid reagent conveying part 22 are simultaneously provided on the reagent adding and mixing device 20, so that reagents in different states can be flexibly selected for input according to the properties of the sludge. The water heating element 90 is connected to the hot water conveying element 24, which can provide a stable hot water supply for the chemical dosing and mixing device 20, ensure the mixing effect of hot water and chemical, and facilitate the subsequent conditioning of sludge with ultrasonic reaction to improve the quality of sludge treatment.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A conditioning system for centrifugal dewatered sludge, characterized in that: include: A first conveying device (10), a drug dosing and mixing device (20), a stirring device (30), a second conveying device (40), an ultrasonic reaction device (50), a third conveying device (70), and a plate-and-frame filter press (80) are connected in sequence; The reagent dosing and mixing device (20) is provided with a hot water conveying member (24), the first conveying device (10) is used to convey the sludge to the reagent dosing and mixing device (20), the reagent dosing and mixing device (20) is used to convey the input reagent and the sludge to the stirring device (30), the stirring device (30) is used to mix and stir the reagent and the sludge, and convey them to the second conveying device (40), the second conveying device (40) is used to convey the sludge to the ultrasonic reaction device (50) for reaction treatment, and convey it to the plate and frame filter press (80) through the third conveying device (70) to squeeze out the sludge.

2. A conditioning system for centrifugal dewatered sludge according to claim 1, characterized in that: The medicine dosing and mixing device (20) is provided with a solid medicine conveying member (21) and a mixing member (23), wherein the solid medicine conveying member (21), the mixing member (23) and the hot water conveying member (24) are arranged in sequence.

3. A conditioning system for centrifugal dewatered sludge according to claim 2, characterized in that: The medicine dosing and mixing device (20) is further provided with a liquid medicine conveying member (22), which is located between the solid medicine conveying member (21) and the mixing member (23).

4. A conditioning system for centrifugal dewatered sludge according to claim 1, characterized in that: Also includes: The water heating element (90) is used to connect to the hot water conveying element (24).

5. A conditioning system for centrifugal dewatered sludge according to claim 1, characterized in that: Also includes: The buffer device (60) is located between the ultrasonic reaction device (50) and the third conveying device (70).

6. A conditioning system for centrifugal dewatered sludge according to claim 2, characterized in that: The ultrasonic reaction device (50) is a pipeline-type ultrasonic device.

7. A conditioning system for centrifugal dewatered sludge according to claim 1, characterized in that: The ultrasonic reaction device (50) is provided with a plurality of ultrasonic probe placement holes (51) and a sludge output pipe (52).

8. The conditioning system for centrifugal dewatered sludge according to claim 5, characterized in that: A stirrer is provided in both the buffer device (60) and the stirring device (30).

9. A conditioning system for centrifugal dewatered sludge according to claim 1, characterized in that: The second conveying device (40) and the third conveying device (70) are both sludge screw pumps.

10. A conditioning system for centrifugal dewatered sludge according to claim 2, characterized in that: A double helix is ​​provided in the mixing element (23).

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