Residue soil washing and spraying wastewater decrement purification system and method based on freezing method

Abstract

The invention relates to the technical field of muck washing and spraying wastewater treatment, in particular to a muck washing and spraying wastewater decrement purification system and method based on a freezing method, a freezing treatment device is used for receiving washing and spraying water precipitated and filtered by a precipitation filter cartridge, and the precipitation filter cartridge is used for removing solid particles in washing and spraying liquid; according to the invention, the sewage is treated by a freezing method, so that the sewage with complex components can be directly treated, the complexity of multi-stage treatment in the prior art is avoided, a relatively great resource utilization effect can be achieved, and the generated purified water can be considered to be reused for spraying or other links if the water quality reaches the standard, so that resource utilization is realized; formation of ice crystals is slowed down by disturbing water flow, the effect of guiding the icing direction is achieved, compared with the mode that icing guiding is conducted through local temperature rise, the utilization rate of a cold source is higher, the situation that local temperature rise influences the overall cooling speed is avoided, the device can act on a larger area, and the cooling efficiency is improved. The larger the acting area is, the lower the possibility of the ice crystal entrainment phenomenon is.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology for slag washing and leaching, specifically to a wastewater reduction and purification system and method based on freezing. Background Technology

[0002] The cryogenic wastewater treatment method is very suitable for treating slag spray containing heavy metals, high salinity, and complex composition.

[0003] The freezing method utilizes the property that ice crystals repel most impurities (including suspended solids, dissolved salts, and some organic matter) when water freezes, thereby separating wastewater into relatively pure ice and a concentrated liquid containing pollutants. This method can separate water and pollutants in the spray solution, achieving volume reduction and purification.

[0004] However, there is a problem when treating wastewater by freezing: ice crystal entrainment. During the ice crystal growth process, some of the concentrate may be trapped in the ice crystals and difficult to discharge effectively, thus affecting the quality of separation.

[0005] Therefore, a wastewater reduction and purification system and method based on freezing method for slag washing and leaching is proposed to address the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a wastewater reduction and purification system and method for slag washing and leaching wastewater based on freezing. Because the concentration direction of the concentrate is consistent with the freezing sequence, the concentration can be guided to aggregate by controlling the freezing sequence. This allows irregular ice crystal entrainment to be guided to the central area of ​​the concentrate along the freezing direction, thereby minimizing ice crystal entrainment and ensuring efficient separation.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a wastewater reduction and purification system for slag washing and leaching based on freezing method, comprising a sedimentation filter cylinder and a freezing treatment device, wherein the freezing treatment device is used to receive the washing and leaching water after sedimentation and filtration by the sedimentation filter cylinder;

[0008] The sedimentation filter cartridge is used to remove solid particles from the washing liquid. This invention treats wastewater by freezing, which can directly treat wastewater with complex composition, avoiding the cumbersome multi-stage treatment in the prior art, and can have a greater resource utilization effect. If the purified water meets the water quality standards, it can be considered for reuse in spraying or other processes to achieve resource utilization, while the high-concentration liquid is sent to incineration or other final disposal methods, which can effectively reduce the overall treatment cost.

[0009] Multiple evenly distributed venting pipes are fixedly connected to the bottom of the freezer compartment. The bottom of each venting pipe is connected to an inlet check valve, which is connected to the inside of the base. A conical mesh is fixedly connected to the inside of the top of each venting pipe via a crossbar. The top of the venting pipe is an outlet hole. Leakage holes are provided on the conical mesh, with the diameter of the leakage holes gradually decreasing from the center of the conical mesh to the outside. The inlet check valve is used to prevent liquid in the freezer compartment from leaking out of the venting pipes.

[0010] This invention slows down the formation of ice crystals by disturbing the water flow, thereby guiding the direction of freezing. By controlling the freezing sequence, it guides the concentration of the concentrate and directs the irregular ice crystal entrainment phenomenon to the concentrate in the central region along the freezing direction, thereby minimizing the ice crystal entrainment phenomenon and ensuring high separation efficiency.

[0011] Compared to methods that guide icing by localized heating, this invention has a higher utilization rate of the cold source, avoids localized heating from affecting the overall cooling rate, and can be applied to a larger area. The larger the area affected, the lower the possibility of ice crystal entrainment.

[0012] When the vent is filled with air, because the diameter of the vent gradually decreases from the center of the cone mesh to the outside, the gas will preferentially pass through the nearest and largest central vent, while the vents at the outer end of the cone mesh are smaller and farther away, so much less gas will pass through the vents at the outer end of the cone mesh.

[0013] During the gas emission process, the gas surge gradually intensifies from the outside to the inside, centered on the vertical line where the gas vent is located. This makes it more difficult for the water area closer to the vertical line where the gas vent is located to freeze. The upward surge is greatest at the vertical line where the gas vent is located, so the water area at the vertical line where the gas vent is located is less likely to freeze. The further away from the vertical line where the gas vent is located, the smaller the gas surge phenomenon, and the easier it is to freeze, thus guiding the freezing process.

[0014] This invention allows for the opening of small, operable holes in the freezer compartment to observe the state of the ice formation.

[0015] During the freezing process, observe the state and rate of freezing, and adjust the air intake in the base. The smaller the air intake, the less the upward surge of the gas surging along the vertical line where the vent pipe is located. The further away from the vertical line where the vent pipe is located, the smaller or even absent the gas surging phenomenon will be.

[0016] The concentrate is guided to the vertical line where the gas vent is located, and the irregular ice crystal entrainment phenomenon is guided to the vertical line where the gas vent is located, thereby increasing the quality of separation.

[0017] As a preferred embodiment of the wastewater reduction and purification system for slag washing based on the freezing method of the present invention, the freezing treatment device includes a freezing chamber and a base that can move up and down at the bottom. A flexible connecting belt connects the freezing chamber and the base to achieve sealing. A liquid outlet is opened at the bottom of the freezing chamber for discharging concentrated liquid and subsequent melting water. A baffle is fixedly connected to the inner side of the base. When the base moves upward, the baffle can block the liquid outlet.

[0018] As a preferred embodiment of the wastewater reduction and purification system for slag washing based on the freezing method of the present invention, the top of the freezing chamber is connected to a cold source, and the inner side of the top of the freezing chamber is connected to an inlet pipe for pumping in washing water and flushing gas. The bottom of the base is connected to an outlet pipe for discharging washing water and pumping in surging gas.

[0019] As a preferred embodiment of the wastewater reduction and purification system for slag washing based on freezing method of the present invention, a ring is fixedly connected to the outer top of the freezing chamber, and a support leg is fixedly connected to the bottom of the ring to support the freezing chamber. A hydraulic support seat is provided at the bottom of the base, and the movable end of the top of the hydraulic support seat is fixedly connected to the bottom of the base. The up and down movement of the base is realized by the lifting and lowering of the hydraulic support seat.

[0020] In a preferred embodiment of the wastewater reduction and purification system for slag washing based on the freezing method of the present invention, the cold source is the cold surface of a refrigerator, the refrigerator is a heat pump, and the "hot surface" of the heat pump can be used to heat water for domestic or industrial use.

[0021] As a preferred embodiment of the wastewater reduction and purification system for slag washing based on the freezing method of the present invention, the outer side of the cone mesh is provided with an inwardly recessed groove, and the leakage hole is opened on the groove.

[0022] In this configuration, when the outer side of the cone mesh has an inwardly recessed groove, the gas will preferentially and evenly select multiple grooves to float upwards as soon as it emerges from the vent, which can increase the uniformity of the concentric positions of the gas surge.

[0023] As a preferred embodiment of the wastewater reduction and purification system for slag washing based on the freezing method of the present invention, a sealing gasket is fixedly connected to the top of the baffle, which can increase the sealing performance when the baffle is connected to the outlet hole.

[0024] As a preferred embodiment of the wastewater reduction and purification system for slag washing based on the freezing method of the present invention, the inlet pipe is equipped with a flange, which can be connected to the input / output end of a sewage pump or a blower.

[0025] As a preferred embodiment of the wastewater reduction and purification system for slag washing based on the freezing method of the present invention, the outlet pipe is equipped with a flange and a valve, which can be connected to the output end of the blower.

[0026] The steps of the wastewater reduction and purification method based on freezing for slag washing and leaching are as follows:

[0027] Step 1: Feeding. Connect the inlet pipe to the output end of the sewage pump and discharge the supernatant filtered by the sedimentation filter into the inside of the freezer. At this time, the baffle moves upward to block the outlet hole.

[0028] Step 2: Freezing. The cold source starts working to cool the inside of the freezer compartment.

[0029] Step 3: Gas surging. During the cooling process, the inlet pipe is connected to the input end of the external fan, and the output end of the external fan is connected to the outlet pipe. A closed loop is formed between the outlet pipe, the freezer chamber, the inlet pipe, and the external fan. Insulation cotton can be wrapped around the surface of the outlet pipe, the freezer chamber, the inlet pipe, and the external fan to greatly reduce cold source leakage. The drive motor of the external fan does not contact the air duct to prevent the heat of the drive motor from affecting the freezing efficiency and to reduce heat loss during the ice-guiding process.

[0030] When the external fan is working, the pressure inside the base increases, and the gas enters the freezing chamber through the inlet check valve and the vent pipe. When the vent is filled with gas, the gas surge gradually intensifies from the outside to the inside, centered on the vertical line where the vent pipe is located. This makes it more difficult for the water area closer to the vertical line where the vent pipe is located to freeze, guides the concentrate to the vertical line where the vent pipe is located, and guides the irregular ice crystal entrainment phenomenon to the vertical line where the vent pipe is located, thereby increasing the quality of separation.

[0031] Step 4: Drain the concentrate. After freezing, the base moves downward to expose the liquid outlet. The liquid concentrate will first be discharged through the liquid outlet and the outlet pipe, thus achieving the separation of the concentrate.

[0032] Step 5: Rinse the concentrate. During the process of draining the concentrate, connect the inlet pipe to the air pump and pressurize the freezer chamber. As the ice melts, gaseous flow channels will gradually appear inside the ice, further carrying away the liquid concentrate. During the pressurization process, a small amount of pure water can be added to enhance the concentration removal effect.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. This wastewater reduction and purification system based on freezing method uses a sedimentation filter cartridge to remove solid particles from the washing liquid. This invention treats wastewater through freezing, which can directly treat wastewater with complex composition, avoiding the cumbersome multi-stage treatment in the prior art, and can have a greater resource utilization effect. If the purified water meets the water quality standards, it can be considered for reuse in spraying or other processes to achieve resource utilization, while the high-concentration liquid is sent to incineration or other final disposal methods, which can effectively reduce the overall treatment cost.

[0035] 2. This wastewater reduction and purification system based on freezing method for slag washing has multiple evenly distributed venting pipes fixedly connected to the bottom of the freezing chamber. The bottom of the venting pipes is connected to an inlet one-way valve, which is connected to the inside of the base. A conical mesh is fixedly connected to the inside of the top of the venting pipes by a crossbar. The top of the venting pipes is an outlet hole. Leakage holes are opened on the conical mesh. The diameter of the leakage holes gradually decreases from the center of the conical mesh to the outside. The inlet one-way valve is used to prevent liquid in the freezing chamber from leaking out of the venting pipes.

[0036] 3. This wastewater reduction and purification system based on freezing method slows down the formation of ice crystals by disturbing the water flow, thereby guiding the direction of freezing. Compared with the method of guiding freezing by local heating, this invention has a higher utilization rate of cold source, avoids the impact of local heating on the overall cooling rate, and can be applied to a larger area. The larger the area applied, the lower the possibility of ice crystal entrainment.

[0037] 4. In this wastewater reduction and purification system based on freezing method, when the air outlet is filled with air, because the diameter of the leakage hole gradually decreases from the center of the cone mesh to the outside, the gas will preferentially pass through the nearest and largest central leakage hole, while the leakage holes at the outer end of the cone mesh are small and far away, so much less gas will pass through the leakage holes at the outer end of the cone mesh.

[0038] 5. In this wastewater reduction and purification system based on freezing, during the gas emission process, a gradually intensifying gas surge occurs from the outside to the inside, centered on the vertical line where the gas vent is located. This makes it more difficult for the water area closer to the vertical line where the gas vent is located to freeze. The upward surge is greatest at the vertical line where the gas vent is located, so the water area at the vertical line where the gas vent is located is less likely to freeze. The further away from the vertical line where the gas vent is located, the smaller the gas surge phenomenon, and the easier it is to freeze. This invention guides the freezing process. The invention can open a small hole in the freezing chamber to observe the freezing state.

[0039] 6. This wastewater reduction and purification system based on freezing method for slag washing observes the state and rate of freezing during the freezing process and adjusts the air intake in the base. The smaller the air intake, the less the upward surge along the vertical line where the vent pipe is located. The further away from the vertical line where the vent pipe is located, the smaller or even absent the gas surge phenomenon will be. This guides the concentrate to the vertical line where the vent pipe is located and guides the irregular ice crystal entrainment phenomenon to the vertical line where the vent pipe is located, thereby increasing the separation quality. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 This is an exploded structural diagram of the freezing treatment apparatus of the present invention;

[0042] Figure 3 This is a schematic diagram of the overall internal cross-sectional structure of the freezing treatment apparatus of the present invention;

[0043] Figure 4 For the present invention Figure 3 A schematic diagram of the structure at point A;

[0044] Figure 5 This is a schematic diagram of the external structure of the baffle of the present invention;

[0045] Figure 6 This is a schematic diagram of the structure at the cone mesh of the present invention;

[0046] Figure 7 For the present invention Figure 6 Schematic diagram of the structure at point B in the diagram;

[0047] Figure 8 This is a top view of the cone mesh structure of the present invention.

[0048] In the diagram: 1. Sedimentation filter cartridge; 2. Refrigeration unit; 21. Inlet pipe; 22. Cold source; 23. Freezing chamber; 24. Circular ring; 25. Support leg; 26. Base; 27. Hydraulic support seat; 28. Outlet pipe; 29. ​​Baffle; 291. Sealing gasket; 210. Vent pipe; 2101. Inlet check valve; 2102. Vent hole; 211. Liquid outlet hole; 212. Flexible connecting belt; 213. Conical mesh; 2131. Leakage hole; 2132. Slide groove; 214. Crossbar. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] Example 1, please refer to Figures 1-7 The present invention provides a technical solution, a wastewater reduction and purification system for slag washing and leaching based on freezing method, including a sedimentation filter cylinder 1 and a freezing treatment device 2, wherein the freezing treatment device 2 is used to receive the washing and leaching water after sedimentation and filtration by the sedimentation filter cylinder 1.

[0051] The sedimentation filter cartridge 1 is used to remove solid particles from the washing liquid. This invention treats wastewater by freezing, which can directly treat wastewater with complex composition, avoiding the cumbersome multi-stage treatment in the prior art, and can have a greater resource utilization effect. If the purified water and ice melt water produced meet the water quality standards, they can be considered for reuse in spraying or other processes to achieve resource utilization, while the high-concentration liquid is sent to incineration or other final disposal methods, which can effectively reduce the overall treatment cost.

[0052] Multiple evenly distributed venting pipes 210 are fixedly connected to the bottom of the freezer compartment 23. The bottom of the venting pipe 210 is connected to an inlet one-way valve 2101. The inlet one-way valve 2101 is connected to the inside of the base 26. A cone mesh 213 is fixedly connected to the inside of the top of the venting pipe 210 through a crossbar 214. The top of the venting pipe 210 is a vent hole 2102. A leakage hole 2131 is opened on the cone mesh 213. The diameter of the leakage hole 2131 gradually decreases from the center of the cone mesh 213 to the outside. The inlet one-way valve 2101 is used to prevent liquid in the freezer compartment 23 from leaking out from the venting pipe 210.

[0053] This invention slows down the formation of ice crystals by disturbing the water flow, thereby guiding the direction of freezing. By controlling the freezing sequence, it guides the concentration of the concentrate and directs the irregular ice crystal entrainment phenomenon to the concentrate in the central region along the freezing direction, thereby minimizing the ice crystal entrainment phenomenon and ensuring high separation efficiency.

[0054] Compared to methods that guide icing by localized heating, this invention has a higher utilization rate of the cold source, avoids localized heating from affecting the overall cooling rate, and can be applied to a larger area. The larger the area affected, the lower the possibility of ice crystal entrainment.

[0055] When the vent 2102 is filled with air, because the diameter of the leakage hole 2131 gradually decreases from the center of the cone mesh 213 to the outside, the gas will preferentially pass through the nearest and largest central leakage hole 2131, while the leakage hole 2131 at the outer end of the cone mesh 213 is small and far away, so much less gas will pass through the leakage hole 2131 at the outer end of the cone mesh 213.

[0056] During the gas emission process, the gas surge gradually intensifies from the outside to the inside, centered on the vertical line where the gas vent 210 is located. This makes it more difficult for the water area closer to the vertical line where the gas vent 210 is located to freeze. The upward surge is greatest at the vertical line where the gas vent 210 is located, so the water area at the vertical line where the gas vent 210 is located is less likely to freeze. The further away from the vertical line where the gas vent 210 is located, the smaller the gas surge phenomenon, and the easier it is to freeze, thus guiding the freezing process.

[0057] This invention allows for the opening of small, operable holes in the freezer compartment to observe the state of the ice formation.

[0058] During the freezing process, observe the state and rate of freezing, and adjust the air intake in the base 26. The smaller the air intake, the less the upward surge of the vertical line where the vent pipe 210 is located. The further away from the vertical line where the vent pipe 210 is located, the smaller or disappearing the gas surge phenomenon will be.

[0059] The concentrate is guided to the vertical line where the gas venting pipe 210 is located, and the irregular ice crystal entrainment phenomenon is guided to the vertical line where the gas venting pipe 210 is located, thereby increasing the quality of separation.

[0060] Specifically, the freezing treatment device 2 includes a freezing chamber 23 and a base 26 that can move up and down at the bottom. A flexible connecting strip 212 connects the freezing chamber 23 and the base 26 to achieve a seal. The bottom of the freezing chamber 23 is provided with a liquid outlet 211 for discharging concentrated liquid and subsequent melting water. A baffle 29 is fixedly connected to the inner side of the base 26. When the base 26 moves upward, the baffle 29 can block the liquid outlet 211.

[0061] Specifically, a cold source 22 is connected to the top of the freezer compartment 23, and an inlet pipe 21 is connected to the inner side of the top of the freezer compartment 23. The inlet pipe 21 is used to pump in the washing water and flushing gas. An outlet pipe 28 is connected to the bottom of the base 26. The outlet pipe 28 is used to discharge the washing water and pump in the surging gas.

[0062] Specifically, a ring 24 is fixedly connected to the outer top of the freezer compartment 23, and a support leg 25 is fixedly connected to the bottom of the ring 24 to support the freezer compartment 23. A hydraulic support seat 27 is provided at the bottom of the base 26. The movable end of the top of the hydraulic support seat 27 is fixedly connected to the bottom of the base 26. The base 26 moves up and down by lifting the hydraulic support seat 27. The hydraulic support seat 27 is a hydraulic lifting device, such as a hydraulic rod, which will not be elaborated further here.

[0063] Specifically, the cold source is the cold side of the refrigerator, the refrigerator is a heat pump, and the "hot side" of the heat pump can be used to heat water for domestic or industrial use.

[0064] Specifically, a sealing gasket 291 is fixedly connected to the top of the baffle 29, which can increase the sealing performance when the baffle 29 is connected to the liquid outlet 211.

[0065] Specifically, the inlet pipe 21 has a flange, which can be connected to the input / output end of a sewage pump or blower.

[0066] Specifically, outlet pipe 28 is equipped with flanges and valves, which can be connected to the output end of the blower.

[0067] Example 2 is a further improvement upon Example 1. Please refer to Example 1. Figures 1-8 The outer side of the cone mesh 213 is provided with an inwardly recessed groove 2132, and the drain hole 2131 is provided on the groove 2132.

[0068] In this configuration, when the outer side of the cone mesh 213 has an inwardly recessed groove 2132, the gas will preferentially and evenly select multiple grooves 2132 to float up when it just emerges from the vent 2102, which can increase the uniformity of the concentric positions of the gas surge.

[0069] This invention also discloses a method for reducing and purifying wastewater from slag washing and leaching based on freezing, the steps of which are as follows:

[0070] Step 1: Feeding. The inlet pipe 21 is connected to the output end of the sewage pump. The supernatant filtered by the sedimentation filter cartridge 1 is discharged into the inside of the freezer chamber 23. At this time, the baffle 29 moves upward to block the liquid outlet 211.

[0071] Step 2: Freezing. Cold source 22 starts working to cool the inside of freezer compartment 23.

[0072] Step 3: Gas surges and during the cooling process, the inlet pipe 21 is connected to the input end of the external fan, and the output end of the external fan is connected to the outlet pipe 28. A closed loop is formed between the outlet pipe 28, the freezer chamber 23, the inlet pipe 21, and the external fan. Insulation cotton can be wrapped around the surface of the outlet pipe 28, the freezer chamber 23, the inlet pipe 21, and the external fan to greatly reduce the leakage of cold source. The drive motor of the external fan does not contact the air duct to prevent the heat of the drive motor from affecting the freezing efficiency and to reduce heat loss during the ice-guiding process.

[0073] When the external fan is working, the pressure inside the base 26 increases, and the gas enters the freezing chamber 23 through the inlet one-way valve 2101 and the vent pipe 210. When the vent 2102 is filled with gas, the gas surge gradually intensifies from the outside to the inside with the vertical line where the vent pipe 210 is located as the center. This makes it more difficult for the water area closer to the vertical line where the vent pipe 210 is located to freeze, guides the concentrate to the vertical line where the vent pipe 210 is located, and guides the irregular ice crystal entrainment phenomenon to the vertical line where the vent pipe 210 is located, thereby increasing the quality of separation.

[0074] Step 4: Drain the concentrate. After freezing, the base 26 moves downward to expose the liquid outlet 211. The liquid concentrate will first be discharged through the liquid outlet 211 and the outlet pipe 28 to achieve the separation of the concentrate.

[0075] Step 5: Rinse the concentrate. During the process of draining the concentrate, connect the inlet pipe 21 to the air pump and pressurize the freezer chamber 23. As the ice melts, gaseous flow channels will gradually appear inside the ice, further carrying away the liquid concentrate. During the pressurization process, a small amount of pure water can be added to increase the concentration removal effect.

[0076] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sludge washing wastewater reduction and purification system based on a freezing method, comprising a sedimentation and filtration cylinder (1) and a freezing treatment device (2), characterized in that: The refrigeration chamber (23) in the refrigeration treatment device (2) receives the precipitated and filtered shower water through the sewage pump and the flange pipeline; The bottom end of the refrigeration chamber (23) is fixedly connected with a plurality of uniformly distributed air outlet pipes (210), the bottom end of the air outlet pipe (210) is communicated with an inlet one-way valve (2101), the inlet one-way valve (2101) is communicated with the inner side of the base (26), the top end of the air outlet pipe (210) is fixedly connected with a conical net (213) through a cross rod (214) on the inner side, the top end of the air outlet pipe (210) is a gas outlet hole (2102), a plurality of leak holes (2131) are formed in the conical net (213), the diameters of the leak holes (2131) gradually decrease from the center to the outer side of the conical net (213), when the gas outlet hole (2102) is inflated, the gas surge gradually increases from the outside to the inside with the vertical line of the air outlet pipe (210) as the center, so that the water area close to the vertical line of the air outlet pipe (210) is difficult to freeze, the concentrated liquid is guided to the vertical line of the air outlet pipe (210), and the irregular ice crystal entrainment phenomenon is guided to the vertical line of the air outlet pipe (210), so that the separation quality is improved.

2. The freeze-based purification system for reducing sludge washing wastewater according to claim 1, characterized in that: The refrigeration treatment device (2) further comprises a base (26) capable of moving up and down at the bottom, a soft connection belt (212) is connected between the refrigeration chamber (23) and the base (26), the bottom end of the refrigeration chamber (23) is provided with a liquid outlet hole (211), and the inner side of the base (26) is fixedly connected with a baffle (29); when the base (26) moves upwards, the baffle (29) can block the liquid outlet hole (211).

3. The freeze-based purification system for reducing the volume of washwater from a sludge washing process according to claim 2, wherein: The top end of the refrigeration chamber (23) is connected with a cold source (22), the top end of the refrigeration chamber (23) is communicated with an inlet pipe (21), the inlet pipe (21) is used for pumping in the shower water and the flushing gas, and the bottom end of the base (26) is communicated with an outlet pipe (28), the outlet pipe (28) is used for discharging the shower water and pumping in the surge gas.

4. The system for purifying and reducing the amount of sludge washing wastewater based on the freezing method according to any one of claims 1 to 3, characterized in that: The top end of the refrigeration chamber (23) is fixedly connected with a circular ring (24), the bottom end of the circular ring (24) is fixedly connected with a supporting leg (25) for supporting the refrigeration chamber (23), and the bottom end of the base (26) is provided with a hydraulic supporting seat (27), the top end of the movable end of the hydraulic supporting seat (27) is fixedly connected with the bottom end of the base (26), and the up and down movement of the base (26) is realized by the lifting of the hydraulic supporting seat (27).

5. The freeze-based purification system for reducing the volume of wastewater from a sludge washing process according to claim 3, wherein: The cold source is the cold surface of a refrigerator, the refrigerator is a heat pump, and the "hot surface" of the heat pump can be used for heating water to realize domestic or industrial water.

6. The freeze-based purification system for reducing the volume of sewage sludge washing wastewater according to any one of claims 1 to 3, characterized in that: The outer side of the conical net (213) is provided with an inwardly recessed sliding groove (2132), and the leak holes (2131) are formed in the sliding groove (2132).

7. The freeze-based purification system for reducing sludge washing wastewater according to claim 2, wherein: The top end of the baffle (29) is fixedly connected with a sealing gasket (291), which can increase the sealing performance when the baffle (29) is connected with the liquid outlet hole (211).

8. The freeze-based purification system for reducing sludge washing wastewater according to claim 3, wherein: The inlet pipe (21) is provided with a flange and can be connected with the input end / output end of the sewage pump or the fan.

9. The freeze-based purification system for reducing the volume of washwater from a sludge washing process according to claim 8, wherein: The outlet pipe (28) is provided with a flange and a valve and can be connected with the output end of the fan.

10. A method for reducing and purifying sludge washing wastewater based on a freezing method, using the sludge washing wastewater reduction and purification system according to claim 9, characterized by, The steps are as follows: Step one: feeding, the inlet pipe (21) is connected with the output end of the sewage pump, the supernatant filtered by the sedimentation filter cylinder (1) is discharged into the inside of the freezing chamber (23), at this time, the baffle (29) blocks the outlet hole (211); Step two: freezing, the cold source (22) starts to work, and the inside of the freezing chamber (23) is cooled; Step three: gas surge, during the cooling process, the inlet pipe (21) is connected with the input end of the external fan, the output end of the external fan is connected with the outlet pipe (28), a closed loop is formed among the outlet pipe (28), the freezing chamber (23), the inlet pipe (21) and the external fan, so as to reduce the heat loss in the ice formation guiding process, when the external fan works, the pressure in the base (26) increases, the gas enters the freezing chamber (23) through the inlet one-way valve (2101) and the gas outlet pipe (210), when the gas outlet hole (2102) is inflated, the gas surge gradually intensifies from the outside to the inside with the vertical line of the gas outlet pipe (210) as the center, so that the water area closer to the vertical line of the gas outlet pipe (210) is more difficult to freeze, the concentrated liquid is guided to the vertical line of the gas outlet pipe (210), the irregular ice crystal entrainment phenomenon is guided to the vertical line of the gas outlet pipe (210), so as to increase the separation quality; Step four: concentrated liquid discharge, after the freezing is completed, the base (26) moves downward, so that the outlet hole (211) is exposed, the liquid concentrated liquid will be discharged through the outlet hole (211) and the outlet pipe (28) first, so as to realize the separation of the concentrated liquid; Step five: flushing the concentrated liquid, during the process of discharging the concentrated liquid, the inlet pipe (21) is connected with the air pump, the freezing chamber (23) is pressurized, with the melting of the ice body, the gaseous flow channel gradually appears in the ice body, and the liquid concentrated liquid is further taken away.

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