Sludge treatment system

Abstract

The utility model provides a sludge treatment system which comprises a sludge concentration tank, the sludge concentration tank is connected with a sludge centrifugal dehydrator, the sludge centrifugal dehydrator is sequentially connected with a wet sludge stock bin and a thin-layer drying machine, the thin-layer drying machine is respectively connected with a double-effect condenser and a dry sludge stock bin, and the double-effect condenser is connected with the dry sludge stock bin. The double-effect condenser is connected with the non-condensable gas treatment equipment; through the arrangement of the thin-layer drying machine, the resource utilization rate of sludge can be increased, solid-liquid separation can be quickly realized through the cooperation of the sludge concentration tank and the sludge centrifugal dehydrator, and the dehydration treatment of a large amount of sludge can be completed in a short time, so that the overall treatment efficiency is ensured to be at a relatively high level.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sludge treatment technical field, concretely relates to a sludge treatment system. BACKGROUND

[0002] With the continuous progress of social economy and industrial production level in our country, the sewage treatment scale continues to increase, and the production of residual sludge is further increased, but there are still many deficiencies in the treatment of sludge at present, the common treatment process is thickening, dewatering and digestion, the process is complicated, and the treatment cost is high, sludge thin layer drying as a new type of sludge mechanical dewatering method can reduce the moisture content of sludge to below 50%, but it lacks pretreatment measures for stabilization and reduction of sludge, resulting in low degree of sludge resource utilization.

[0003] Based on the above-mentioned defects, a solution is proposed in the application No. CN202121431242.8, a combined micro-bubble ozone oxidation and thin layer drying residual sludge treatment device, which discloses a technical scheme, including a sludge reaction tank, for circulating reaction of residual sludge entering the sludge reaction tank with ozone gas micro-bubbles, and then sending it into a pre-conditioning tank, a pre-conditioning tank for pretreating the sludge treated by the sludge reaction tank, and sending the pretreated sludge into a conditioning tank, a conditioning tank for dewatering the sludge entering the conditioning tank plate and frame filter press with flocculating agent, and sending the dewatered sludge into a thin layer drying machine for conditioning the sludge in the thin layer drying machine to form concentrated sludge, a plate and frame filter press for entering the thin layer drying, a thin layer drying machine for thin layer drying of the sludge sent by the plate and frame filter press with water vapor generated by hot water, which improves the resource utilization rate of sludge, reduces the sludge discharge amount with a small amount of ozone pretreatment, and reduces the cost.

[0004] However, the application from the sludge reaction tank to the pre-conditioning tank, conditioning tank and plate and frame filter press for dewatering has a long dewatering process, and cannot quickly realize solid-liquid separation, complete dewatering treatment of a large amount of sludge in a short time, resulting in relatively low overall treatment efficiency.

[0005] Therefore, it is necessary to provide a new technical scheme to solve the above technical problems. Utility model content

[0006] The utility model provides a kind of sludge treatment system, including sludge thickening tank, the sludge thickening tank is connected with sludge centrifugal dewatering machine, sludge centrifugal dewatering machine is sequentially connected with wet sludge bunker, thin layer drying machine, the thin layer drying machine is respectively connected with double-effect condenser, dry sludge bunker, the double-effect condenser is connected with incondensable gas processing equipment.

[0007] As a preferred solution, the sludge centrifugal dewatering machine includes a frozen crystallization sludge centrifugal dewatering machine and a mixed sludge centrifugal dewatering machine. The frozen crystallization sludge centrifugal dewatering machine and the mixed sludge centrifugal dewatering machine are respectively connected to wet sludge silo one and wet sludge silo two, and the wet sludge silo one and wet sludge silo two are connected to a thin layer drying machine.

[0008] As a preferred solution, the sludge concentration tank is connected to the filtrate tank and the freeze crystallization device in sequence, the freeze crystallization device is connected to the sludge concentration tank, and the sludge concentration tank is connected to the freeze crystallization sludge centrifugal dehydrator.

[0009] As a preferred solution, the double-effect condenser is connected to a plate heat exchanger, and the plate heat exchanger is connected to a freezing crystallization device.

[0010] As a preferred solution, the mixed sludge centrifugal dewatering machine is connected to the sludge concentration tank 1 and the filtrate pool 1 respectively, and the sludge concentration tank 1 is connected to the filtrate pool 1.

[0011] As a preferred solution, the thin layer drying machine is respectively connected to a steam pipe and a condensate pipe.

[0012] As a preferred solution, the non-condensable gas processing equipment adopts a non-condensable gas fan.

[0013] As a preferred solution, a cooling screw conveyor is provided between the thin layer drying machine and the dry sludge silo.

[0014] This application can improve the resource utilization rate of sludge through the setting of a thin layer dryer, and the cooperation of the sludge thickening tank and the sludge centrifugal dewatering machine can quickly realize solid-liquid separation, complete the dehydration treatment of a large amount of sludge in a short time, thereby ensuring the overall treatment efficiency at a high level. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the first embodiment of the present utility model;

[0016] Figure 2 This is a structural block diagram of the second embodiment of the present utility model;

[0017] 1. Sludge thickening tank; 2. Sludge centrifugal dewatering machine; 3. Wet sludge silo; 4. Thin-layer drying machine; 5. Steam pipe; 6. Condensate pipe; 7. Double-effect condenser; 8. Dry sludge silo; 9. Cooling screw conveyor; 10. Non-condensable gas treatment equipment; 11. Filtrate tank; 12. Freeze crystallization device; 13. Plate heat exchanger; 14. Freeze crystallization sludge centrifugal dewatering machine; 15. Mixed sludge centrifugal dewatering machine; 16. Wet sludge silo 1; 17. Wet sludge silo 2; 18. Sludge thickening tank 1; 19. Filtrate tank 1. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1 To the attached Figure 2 The specific implementation of the present invention is described in detail. It should be noted that the specific implementation described herein is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0019] Example 1:

[0020] This embodiment provides a sludge treatment process, including a sludge thickening tank 1, which is preferably 100m 3 The sludge thickening tank 1 is connected to the sludge centrifugal dehydrator 2, and the sludge centrifugal dehydrator 2 is connected to the wet sludge silo 3 and the thin layer dryer 4 in sequence. A delivery pump is provided between the wet sludge silo 3 and the thin layer dryer 4. The thin layer dryer 4 is respectively connected to a steam pipe 5 and a condensate pipe 6. The steam pipe 5 is fed with medium-pressure steam to heat the thin layer dryer 4 and dry the sludge in the thin layer dryer 4. The thin layer dryer 4 is respectively connected to a double-effect condenser 7, The dry sludge silo 8 is connected to the dry sludge silo, and a cooling screw conveyor 9 is provided between the thin layer drying machine 4 and the dry sludge silo 8. The dried material in the thin layer drying machine 4 is transported to the dry sludge silo 8 through the cooling screw conveyor 9; the double-effect condenser 7 is connected to the non-condensable gas treatment equipment 10, and the non-condensable gas treatment equipment 10 adopts the non-condensable gas fan in the prior art. The non-condensable gas generated after condensation of the double-effect condenser 7 is treated by the non-condensable gas fan and discharged as waste gas; the sludge concentration The tank 1 gravity concentrates the sludge. After concentration, the moisture content of the sludge is about 97%-98%. It is lifted to the sludge centrifugal dewatering machine 2 by the sludge feed pump. The sludge centrifugal dewatering machine 2 centrifuges the concentrated sludge. The dehydrated sludge is temporarily stored in the wet sludge silo 3. The sludge in the wet sludge silo 3 enters the thin layer dryer 4, and the sludge is dried by medium-pressure steam. The dried sludge is sent to the dry sludge silo 8 through the cooling screw conveyor 9 for subsequent treatment. The steam generated by the thin layer dryer 4 is condensed by the double-effect condenser 7, and the non-condensable gas generated after condensation is treated by the non-condensable gas treatment equipment 10 and discharged as waste gas. The present application improves the resource utilization rate of the sludge by the setting of the thin layer dryer 4. In addition, through the cooperation of the sludge concentration tank 2 and the sludge centrifugal dewatering machine 2, solid-liquid separation can be quickly achieved, and a large amount of sludge dehydration can be completed in a short time, thereby ensuring that the overall treatment efficiency is at a high level.

[0021] Example 2:

[0022] This embodiment can reduce the dependence on flocculants, reduce treatment costs and also reduce potential impacts on the environment; in addition, it is beneficial to the subsequent centrifugal dehydration process, specifically:

[0023] The sludge thickening tank 1 is connected to the filtrate pool 11 and the freezing crystallization device 12 in sequence. The freezing crystallization device 12 is connected to the sludge thickening tank 1. After the sludge is treated by the freezing crystallization device 12, the moisture therein is formed into a crystalline state, which changes the physical structure of the sludge. For example, the particle size and hardness of the sludge may change, which is more conducive to the subsequent centrifugal dehydration process; the freezing crystallization treatment can replace the use of some chemical agents to a certain extent. After the freezing crystallization treatment, the dependence on flocculants and other agents may be reduced, reducing the treatment cost while also reducing the potential impact on the environment; some sludge after being treated by the freezing crystallization device 12 still contains a high moisture content or fails to fully meet the treatment requirements. It is returned to the sludge thickening tank 1, and the initial treatment capacity of the sludge thickening tank 1 is used to re-concentrate this part of the sludge, providing better conditions for subsequent freezing crystallization treatment, thereby improving the efficiency of the entire treatment system.

[0024] Preferably, this embodiment can reduce the energy consumption of the entire system. The double-effect condenser 7 is connected to the plate heat exchanger 13, and the plate heat exchanger 13 is connected to the freezing crystallization device 12. The heat generated by the double-effect condenser 7 can be transferred to the medium flowing through the plate heat exchanger 13 by being connected to the plate heat exchanger 13. The plate heat exchanger 13 can transport the medium that has been heated by heat exchange to the freezing crystallization device 12, providing the specific temperature conditions required for the freezing crystallization process, and can accurately control the temperature of the medium entering the freezing crystallization device 12 to ensure the efficient progress of the crystallization process. Heat can be transferred between different fluids to achieve efficient energy utilization.

[0025] Example 3:

[0026] This embodiment specifically defines the sludge centrifugal dewatering machine 2, specifically:

[0027] The sludge centrifugal dehydrator 2 includes a frozen crystallized sludge centrifugal dehydrator 14 and a mixed sludge centrifugal dehydrator 15. The processing capacity of the frozen crystallized sludge centrifugal dehydrator 14 is preferably Q = 5-12m 3 / h, the processing capacity of the mixed sludge centrifugal dewatering machine 15 is preferably Q = 5-12m 3 / h; the frozen crystallized sludge centrifugal dewatering machine 14 and the mixed sludge centrifugal dewatering machine 15 are respectively connected to the wet sludge silo 16 and the wet sludge silo 2 17, and the wet sludge silo 16 and the wet sludge silo 2 17 are connected to the thin layer drying machine 4. The thin layer drying machine 4 adopts the horizontal thin layer drying machine in the prior art, and the processing capacity is preferably 1t / h; the frozen crystallized sludge centrifugal dewatering machine 14 is connected to the sludge thickening tank 1, and the mixed sludge centrifugal dewatering machine 15 is respectively connected to the sludge thickening tank 18 and the filtrate pool 19, and the sludge thickening tank 18 is connected to the filtrate pool 19.

[0028] The freezing crystallization device 12 cools the sludge to a low temperature so that the water therein forms crystals. This process changes the physical properties of the sludge, making it easier to separate the water from the sludge. The freezing crystallization lowers the temperature of the sludge so that the water solidifies into ice crystals under certain temperature and pressure conditions. The frozen sludge enters the sludge concentration tank 1, and the sludge in the sludge concentration tank 1 enters the freezing crystallization sludge centrifugal dehydrator 14. The freezing crystallization sludge centrifugal dehydrator 14 uses the action of centrifugal force to dehydrate the frozen crystallized sludge. In the high-speed rotating centrifugal field, the solid particles and water in the sludge will be subjected to different centrifugal forces, thereby To achieve solid-liquid separation, solid particles are thrown to the wall of the centrifuge, while water is discharged through the outlet of the centrifuge; the frozen crystallization sludge centrifugal dehydrator 14 can achieve efficient dehydration effect and reduce the moisture content in the sludge to a lower level. This is because the freezing crystallization process makes the water easier to separate, and the centrifugal dehydration technology can quickly and effectively remove the water; it is suitable for processing various types of sludge and can process sludge with different moisture content, viscosity and particle size. It has strong adaptability, simple operation and stable operation. The operator only needs to set the relevant parameters and the equipment can run automatically, which greatly reduces labor intensity.

[0029] The sludge in the sludge thickening tank 18 enters the mixed sludge centrifugal dewatering machine 15 for dehydration treatment. The mixed sludge centrifugal dewatering machine 15 mainly uses the action of centrifugal force to separate the solid and liquid in the mixed sludge. The equipment rotates at high speed, generating a strong centrifugal force, so that the solid particles in the sludge are thrown to the drum wall, and the water is discharged to the filtrate tank 19 through the pores on the drum wall. The filtrate generated by the concentration in the sludge thickening tank 18 enters the filtrate tank 19, and the filtrate collected in the filtrate tank 19 is returned to the sewage treatment plant for treatment, further improving the utilization rate of sewage.

[0030] The working principle of the utility model is as follows: the sludge concentration tank 1 performs gravity concentration on the sludge delivered from the freezing crystallization device 12, and the sludge is lifted to the freezing crystallization sludge centrifugal dehydrator 14 through the sludge feed pump. The freezing crystallization sludge centrifugal dehydrator 14 performs centrifugal dehydration on the concentrated freezing crystallization sludge, and the dehydrated sludge is temporarily stored in the wet sludge silo 16; the sludge concentration tank 18 performs gravity concentration on the sludge delivered from the sewage treatment plant, and the sludge is lifted to the mixed sludge centrifugal dehydrator 15 through the sludge feed pump. The mixed sludge centrifugal dehydrator 15 The residual sludge and chemical sludge after concentration are centrifugally dehydrated, and the dehydrated sludge is temporarily stored in the wet sludge silo 17; the sludge in the wet sludge silo 16 and the wet sludge silo 2 17 enter the thin layer dryer 4, and the sludge is dried in a thin layer by medium-pressure steam. The dried sludge is sent to the dry sludge silo 8 through the cooling screw conveyor 9 to wait for subsequent treatment. The steam generated by the thin layer dryer 4 is condensed by the double-effect condenser 7, and the non-condensable gas generated after condensation is treated by the non-condensable gas treatment equipment 10 and discharged as waste gas; the sludge concentration tank 1 The filtrate produced after concentration and the filtrate removed from the frozen crystallization sludge centrifugal dewatering machine 14 enter the filtrate pool 11, and the filtrate in the filtrate pool 11 enters the freezing crystallization device 12. Through the freezing crystallization method, specific components in the filtrate can be crystallized and precipitated, thereby realizing resource recycling and reducing the risk of pollution emissions; the filtrate produced after concentration in the sludge concentration tank 18 and the filtrate removed from the mixed sludge centrifugal dewatering machine 15 enter the filtrate pool 19, and the filtrate in the filtrate pool 19 is returned to the sewage treatment plant for treatment, thereby improving the utilization rate of sewage and avoiding direct discharge to cause pollution to the environment; preferably, the heat generated by the double-effect condenser 7 can be connected to the plate heat exchanger 13, and this part of the heat can be transferred to the medium flowing through the plate heat exchanger 13, and the plate heat exchanger 13 can transport the medium after heat exchange and temperature increase to the freezing crystallization device 12, providing the specific temperature conditions required for the freezing crystallization process, and can accurately control the temperature of the medium entering the freezing crystallization device 12 to ensure the efficient progress of the crystallization process; heat can be transferred between different fluids to achieve efficient energy utilization.

[0031] This application improves the resource utilization rate of sludge through the setting of a thin-layer dryer. In addition, through the cooperation of a sludge concentration tank and a sludge centrifugal dewatering machine, it can quickly achieve solid-liquid separation and complete the dehydration of a large amount of sludge in a short time, thereby ensuring that the overall treatment efficiency is at a high level.

[0032] The devices and connection relationships not specifically described above all belong to mechanical connections, electrical connections, etc. in the prior art, and the present invention will not describe them in detail here.

[0033] The preferred embodiment of the present invention is described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above-mentioned embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0034] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations of the present invention will not be described separately.

[0035] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, their applications should also be regarded as the contents disclosed in the present invention.

Claims

1. A sludge treatment system, comprising a sludge thickening tank (1), characterized in that: The sludge concentration tank (1) is connected to the sludge centrifugal dehydrator (2), the sludge centrifugal dehydrator (2) is connected to the wet sludge silo (3) and the thin layer drying machine (4) in sequence, the thin layer drying machine (4) is connected to the double-effect condenser (7) and the dry sludge silo (8) respectively, the double-effect condenser (7) is connected to the non-condensable gas treatment equipment (10); the sludge centrifugal dehydrator (2) includes a frozen crystallization sludge centrifugal dehydrator (14) and a mixed sludge centrifugal dehydrator (15), the frozen crystallization sludge centrifugal dehydrator (14) and the mixed sludge centrifugal dehydrator (15). The dewatering machine (14) and the mixed sludge centrifugal dewatering machine (15) are respectively connected to the wet sludge silo 1 (16) and the wet sludge silo 2 (17), and the wet sludge silo 1 (16) and the wet sludge silo 2 (17) are connected to the thin layer drying machine (4); the sludge concentration tank (1) is connected to the filtrate tank (11) and the freezing crystallization device (12) in sequence, the freezing crystallization device (12) is connected to the sludge concentration tank (1), and the sludge concentration tank (1) is connected to the freezing crystallization sludge centrifugal dewatering machine (14).

2. A sludge treatment system according to claim 1, characterized in that: The double-effect condenser (7) is connected to a plate heat exchanger (13), and the plate heat exchanger (13) is connected to a freezing crystallization device (12).

3. A sludge treatment system according to claim 1, characterized in that: The mixed sludge centrifugal dewatering machine (15) is connected to the sludge concentration tank (18) and the filtrate pool (19) respectively, and the sludge concentration tank (18) is connected to the filtrate pool (19).

4. A sludge treatment system according to claim 1, characterized in that: The thin layer drying machine (4) is respectively connected to a steam pipeline (5) and a condensate pipeline (6).

5. A sludge treatment system according to claim 1, characterized in that: The non-condensable gas treatment equipment (10) adopts a non-condensable gas blower.

6. A sludge treatment system according to claim 1, characterized in that: A cooling screw conveyor (9) is provided between the thin layer drying machine (4) and the dry sludge silo (8).

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