Conditioning system for centrifugally dewatered sludge

Abstract

The invention 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

[0003] With the continuous improvement of sludge treatment and disposal requirements and costs in various regions, it is necessary to further dehydrate the centrifugally dehydrated sludge to a moisture content of less than 60%. Among various deep dehydration processes, the high-pressure plate and frame filter press process is widely used due to its advantages such as low energy consumption, low cost, and simple operation. However, since the sludge has become a semi-solid state after dehydration, it is difficult to mix the sludge with the reagent. It is often necessary to dilute it to a moisture content of 95%~97% before adding the reagent for conditioning, which requires a large amount of reclaimed water or tap water. After the plate and frame filter press, a large amount of high-concentration filtrate will also be produced to be treated; in addition, a large amount of PAM (polyacrylamide, non-ionic polymer flocculant) is added to the centrifugal dehydrated sludge during the dehydration process, and it generally takes a certain period of storage (such as transportation, caching, etc.) before entering the deep dehydration stage. Therefore, the sludge conditioning is difficult, inefficient, and has high investment costs. Therefore, after dilution-conventional chemical agent conditioning, the sludge moisture content is high and the sludge effect is unstable. Summary of the invention

[0004] In order to overcome the defects and shortcomings in 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 investment costs and improving sludge output stability.

[0005] Specifically, the embodiment of the present invention provides a conditioning system for centrifugal dewatered sludge, which adopts the following technical solution: A conditioning system for centrifugal dewatered sludge, comprising: a first conveying device, a reagent 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 connected in sequence; wherein the first conveying device is used to convey the sludge to the reagent adding and mixing device, the reagent adding and mixing device is used to convey the input reagent and the sludge to the stirring device together, the stirring device is used to mix and stir the reagent 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 convey it to the plate and frame filter press via the third conveying device to squeeze out the sludge.

[0006] By adopting the above technical scheme, the steps of conveying, mixing, stirring, ultrasonic reaction and squeezing mud are arranged in a closely connected manner, so as to optimize the sludge treatment process. And after introducing the reagent dosing and mixing device to input the reagent, hot water and ultrasonic wave, the ultrasonic-thermal-chemical combined conditioning reaction is carried out, which can reduce the input of the reagent while achieving the full reaction between the reagent and the sludge, so as to help improve the sludge treatment efficiency, reduce the input cost and improve the stability of the mud.

[0007] 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 arranged in sequence.

[0008] By adopting the above technical solution, the solid medicine conveying member is provided to facilitate the delivery of solid medicine, and the solid medicine conveying member, the mixing member and the hot water conveying member are provided in sequence to ensure that the medicine and the hot water can be fully mixed and act on the sludge.

[0009] Optionally, the medicine dosing and mixing device is further provided with a liquid medicine conveying component, which is located between the solid medicine conveying component and the mixing component.

[0010] By adopting the above technical solution, a solid agent conveying member and a liquid agent conveying member are simultaneously provided on the agent adding and mixing device, and agents in different states can be flexibly selected for input according to the properties of the sludge.

[0011] Optionally, a conditioning system for centrifugal dewatered sludge further includes: a water heating element for connecting to the hot water conveying element.

[0012] 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 chemicals, and promote sludge wall breaking, making it easier to condition the sludge in the subsequent ultrasonic reaction to improve the quality of sludge treatment.

[0013] Optionally, a conditioning system for centrifugal dewatered sludge further includes: a buffer device located between the ultrasonic reaction device and the third conveying device.

[0014] By adopting the above technical solution, the cache device can adjust the rhythm of sludge treatment, avoid blockage or excessive delivery during the treatment process, and thus ensure the stability and continuity of the entire system. The cache device can also serve as a temporary storage area for sludge, providing a stable sludge supply for the subsequent squeezing step.

[0015] Optionally, the ultrasonic reaction device is a pipeline ultrasonic device.

[0016] By adopting the above technical solution and using a pipeline ultrasonic device, the ultrasonic device can be easily disassembled and assembled, and the sludge can be effectively ultrasonically treated, thereby further improving the dehydration effect of the sludge.

[0017] Optionally, the ultrasonic reaction device is provided with a plurality of ultrasonic probe placement holes and a sludge output pipe.

[0018] By adopting the above technical solution, the setting of multiple ultrasonic probe placement holes can facilitate operators to select ultrasonic probes of different sizes to be placed 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, so as to improve the sludge treatment efficiency.

[0019] Optionally, both the cache device and the stirring device are provided with a stirrer.

[0020] By adopting the above technical solution, both the stirring device and the buffer device are provided with a stirrer, so that the sludge can be buffered while stirring, thereby improving the processing efficiency. In addition, the combined use of the stirring device and the buffer device can also avoid the deposition and blockage of the sludge during the processing process.

[0021] Optionally, the second conveying device and the third conveying device are both sludge screw pumps.

[0022] By adopting the above technical solution, the second conveying device and the third conveying device are both set as sludge screw pumps, so that the extraction and transportation of sludge can be realized.

[0023] Optionally, a double helix is ​​provided in the mixing element.

[0024] By adopting the above technical solution, a double helix is ​​arranged 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.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. Setting up closely connected conveying, mixing, stirring, ultrasonic reaction and pressing steps can optimize the sludge treatment process. In addition, introducing a reagent dosing and mixing device to input reagents, hot water and ultrasonic waves, and then performing ultrasonic-thermal-chemical combined conditioning reactions can reduce the input of reagents while achieving full reaction between the reagents and the sludge, which helps to improve the sludge treatment efficiency, reduce input costs and improve the stability of sludge output; 2. The solid agent conveying device and the liquid agent conveying device are simultaneously provided, so that agents in different states can be flexibly selected for input according to the properties of the sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is a schematic diagram of the deep dehydration process of centrifugal dehydration sludge in the existing related technology; Figure 2 A schematic diagram of a conditioning system for centrifugal dewatered sludge disclosed in one embodiment of the present application; Figure 3 for Figure 2 A schematic diagram of an execution flow layout of a conditioning system for centrifugal dewatered sludge is shown; Figure 4 for Figure 3 A schematic diagram of the operation flow of a conditioning system for centrifugal dewatered sludge is shown; Figure 5 for Figure 2 Another schematic diagram of the execution flow layout of a conditioning system for centrifugal dewatered sludge is shown; Figure 6 for Figure 5 The diagram shows a schematic diagram of the operating process of a conditioning system for centrifugal dewatered sludge.

[0027] Description of reference numerals: 10. First conveying device; 20. Drug dosing and mixing device; 21. Solid drug conveying element; 22. Liquid drug 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

[0028] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to be used as limitations to the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear indication to the contrary in the context. It should also be understood that the term "and / or" used in the present application refers to and includes any or all possible combinations of one or more listed items.

[0029] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0030] See also Figure 1In the prior art, deep dehydration of centrifugal dewatered sludge generally adopts the methods of unloading, dilution, chemical conditioning and plate and frame pressing.

[0031] Among them, unloading and dilution adopts batch mode, 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 whole unloading and dilution process takes more than 70 minutes, which is time-consuming. In addition, 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.

[0032] In addition, the diluted centrifugal dewatered sludge enters the sludge conditioning system for dosing and conditioning. The existing sludge conditioning system mainly uses chemical conditioning, that is, the reaction is completed by stirring after adding organic or inorganic conditioning agents. The conditioning process is single, and the only operable parameters are the dosage of the agent and the stirring time. When the sludge organic matter content is high and the amount of PAM (polyacrylamide) added at the front end is too much, it is difficult to obtain a good and stable mud discharge effect. It is often necessary to extend the plate and frame pressing time to reduce the moisture content of the mud, but the effect is not good and it leads to a significant decrease in the plate and frame production capacity.

[0033] 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 refer to the following: 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.

[0034] 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.

[0035] The agent dosing and mixing device 20 is 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 in sequence. 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).

[0036] A double helix is ​​arranged inside the mixing element 23, and the hot water conveying element 24 is used to input a certain amount of hot water after the reagent is added. The double helix mixing of the mixing element 23 can control the moisture content of the mixed sludge to 90%~92%, thereby greatly reducing the filtrate generated by the subsequent plate and frame filter press 80 during dehydration, and conveying the hot water together with the reagent and the sludge to the stirring device 30 can promote the further mixing reaction of the three.

[0037] In this embodiment, the conditioning system further includes a water heating element 90 connected to the hot water conveying element 24 to ensure that the hot water conveying element 24 outputs stable hot water to the medicine dosing and mixing device 20 .

[0038] The water heating element 90 can be a water source heat pump or an air source heat pump, which uses the heat in the tail water or air in the water purification plant for heating, thereby saving energy. The hot water temperature can be determined according to the different sludge properties and process requirements, generally 50~75°C. In addition, the amount of hot water added to the sludge needs to control the water content of the mixed sludge within 90%~92%, which can greatly reduce the filtrate generated during the subsequent dehydration of the plate and frame filter press 80.

[0039] 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.

[0040] 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.

[0041] The ultrasonic reaction device 50 is a pipeline ultrasonic device, with multiple ultrasonic probe placement holes 51 at the upper end and a sludge output pipeline 52 at the lower end. The multiple ultrasonic probe placement holes 51 can facilitate operators to select ultrasonic probes of different sizes and place them in the ultrasonic probe placement holes 51 based on the pipe diameter, flow rate, solid content of the sludge inlet and other parameters of the connecting pipe to improve the sludge treatment efficiency. It is explained here that the ultrasonic reaction device 50 is set as a pipeline ultrasonic device, which can facilitate the disassembly and assembly of the ultrasonic probe.

[0042] The buffer device 60 is located between the ultrasonic reaction device 50 and the third conveying device 70, and serves as a temporary storage area for sludge. It can adjust the rhythm of sludge treatment, provide a stable sludge supply for the subsequent plate and frame filter press 80, avoid blockage or excessive conveying during the treatment process, and thus ensure the stability and continuity of the entire system. It is explained here that the buffer device 60 and the stirring device 30 can have the same structure, that is, a stirrer is also provided inside, and stirring is performed based on demand during the buffering process.

[0043] The third conveying device 70 has the same structure as the second conveying device 40 and may be a sludge screw pump or a plunger pump, which 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.

[0044] The plate and frame filter press 80 is used to reduce the water content in the sludge and squeeze out the sludge. Here, it is worth mentioning that the embodiment of the present application combines multiple conditioning methods such as chemicals, hot water, and ultrasound to stabilize the water content of the sludge out of the plate and frame filter press 80 to less than 55% or even lower.

[0045] See also Figure 3 and Figure 4 In this embodiment, the following steps can be used for adjustment based on the system layout: S1, the first conveying device 10 conveys the sludge to the reagent dosing and mixing device 20; S2, adding the agent from the solid agent conveying member 21 or the liquid agent conveying member 22 into the sludge; 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; S4, the second conveying device 40 transfers the sludge in the stirring device 30 to the ultrasonic reaction device 50 for ultrasonic reaction through the ultrasonic probe placement hole 51; S5, transporting the sludge through the sludge output pipe 52 of the ultrasonic reaction device 50 to the buffer device 60 for buffering; S6. The third conveying device 70 extracts the sludge in the buffer device 60 to the plate and frame filter press 80 to squeeze out the sludge.

[0046] Also, see Figure 5 and Figure 6 In this embodiment, if the organic matter content in the sludge is high, the following steps can also be used for conditioning based on the system layout: S11, the first conveying device 10 conveys the sludge to the reagent dosing and mixing device 20; S12, 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; S13, the second conveying device 40 transfers the sludge in the stirring device 30 to the ultrasonic reaction device 50 for ultrasonic reaction through the ultrasonic probe placement hole 51; S14, transporting the sludge through the sludge output pipe 52 of the ultrasonic reaction device 50 to the buffer device 60 for buffering; S15, adding solid medicine or liquid medicine into the buffer device 60 for stirring and mixing; S16, the third conveying device 70 extracts the sludge in the buffer device 60 to the plate and frame filter press 80 to squeeze out the sludge.

[0047] 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.

[0048] 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 dehydrator and a high-pressure belt dehydrator.

[0049] 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 steps. And after introducing the reagent dosing 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, so as to help improve the sludge treatment efficiency, reduce the input cost and improve the stability of the sludge; and it can be realized from the traditional dilution of the sludge to a moisture content of 95%-97%, to the dilution of the sludge to a moisture content of 90%~92%, thereby reducing the addition of water to achieve 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 dosing and mixing device 20, and reagents in different states can be flexibly selected for input according to the nature of the sludge. The water heating element 90 is connected to the hot water conveying element 24, and can provide a stable hot water supply for the reagent dosing and mixing device 20, ensuring the mixing effect of hot water and reagents, and facilitating the subsequent conditioning of sludge in conjunction with ultrasonic reaction to improve the quality of sludge treatment.

[0050] 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 embodiments of the present invention.

Claims

1. A conditioning system for centrifugal dewatered sludge, characterized in that: include: A first conveying device (10), a reagent 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-frame filter press (80) are sequentially connected; 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 sludge to the reagent dosing and mixing device (20); the reagent dosing and mixing device (20) is used to convey the added reagent and sludge to a stirring device (30); the stirring device (30) is used to mix and stir the reagent and sludge, and convey them to a second conveying device (40); the second conveying device (40) is used to convey the sludge to an ultrasonic reaction device (50) for reaction treatment, and convey the sludge to the plate and frame filter press (80) via the third conveying device (70) for squeezing 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 also 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 be connected 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 pipeline (52).

8. A 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 ​​arranged in the mixing element (23).

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