Wastewater treatment device

Abstract

The utility model provides a wastewater treatment device, the wastewater treatment device comprises a preheating assembly, a membrane distillation assembly and a cooling assembly, the membrane distillation assembly comprises a communicating pipe, a concentration box, a membrane distillation box, a membrane fiber pipe and a cold water pipe, the concentration box is provided with a material passing channel, the membrane distillation box is arranged in the material passing channel, and the membrane fiber pipe is arranged in the material passing channel. The membrane distillation box divides the material passing channel into an upper-layer hot material chamber and a lower-layer hot material chamber, the two ends of the communicating pipe are communicated with the upper-layer hot material chamber and the preheating assembly respectively, and the membrane distillation box is provided with an air gap channel, a first through hole and a second through hole, the membrane fiber pipe penetrates through the first through hole, two ends of the membrane fiber pipe are respectively communicated with the upper-layer hot material chamber and the lower-layer hot material chamber, and the cold water pipe penetrates through the second through hole; the cooling assembly communicates with the cold water pipe. The membrane distillation assembly concentrates and separates production wastewater into condensate water and sulfuric acid and makes full use of the condensate water and the sulfuric acid, wastewater generation is reduced, cost is reduced, the cold water pipe and the membrane fiber pipe are not in direct contact, heat loss is avoided, and operation energy consumption is low.

Description

Technical Field

[0001] The present disclosure relates to the technical field of multiple-effect membrane distillation, and in particular to a wastewater treatment device. Background Art

[0002] In the industrial production process of phosphorus chemical industry, a large amount of fluorine-containing waste gas will be discharged. The fluorine-containing waste gas is treated by a three-stage spray absorption process, and fluorosilicic acid will be produced as a by-product after absorption. Fluorosilicic acid is mainly used to produce fluoride salts and fluorosilicate products, such as aluminum fluoride, sodium fluoride, sodium fluorosilicate, potassium fluorosilicate, magnesium fluorosilicate, etc. The production of sodium fluorosilicate with fluorosilicic acid, sodium chloride and sodium sulfate is the most widely used method for phosphorus chemical enterprises to treat fluorosilicic acid. In order to ensure the stable operation of the wet phosphoric acid workshop, phosphorus chemical enterprises need to transport fluorosilicic acid to the sodium fluorosilicate workshop with a concentration of about 12%. A large amount of wastewater will be generated during the production process of sodium fluorosilicate.

[0003] At present, the production wastewater of sodium fluorosilicate is first discharged into the sewage station, then filtered after lime neutralization, and the filtrate is used as secondary industrial water. However, the treatment is difficult, requiring a large amount of lime and flocculants, and the wet residue produced after treatment is not easy to filter, transport and store. In addition, the sulfuric acid in the production wastewater of sodium fluorosilicate has not been effectively recycled. The extraction section of the wet phosphoric acid workshop requires a large amount of water, and a large amount of sulfuric acid is consumed during the extraction production process. In the production wastewater of sodium fluorosilicate, the main components of the wastewater are water, sulfuric acid, sodium ions and silicate, etc. The sulfuric acid content is relatively high, and the low sodium ion and silicate content have limited impact on the extraction section. Therefore, the best way to consume the production wastewater of sodium fluorosilicate is to use it as supplementary water in the phosphoric acid reaction tank.

[0004] However, the concentration of sulfuric acid in the production wastewater of sodium fluorosilicate is low. When a large amount of the production wastewater of sodium fluorosilicate is added to the phosphoric acid reaction tank, it is easy to cause a large fluctuation in the product process index of the phosphoric acid reaction tank production, which is not conducive to phosphoric acid production. Therefore, it is also necessary to increase the concentration of sulfuric acid in the wastewater and reduce the water content, so as to reduce the impact of the production wastewater of sodium fluorosilicate on the production process of the phosphoric acid reaction tank. Utility Model Content

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a wastewater treatment device that can concentrate production wastewater of sodium fluorosilicate and has low energy consumption and simple structure.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A wastewater treatment device comprises a preheating component, a membrane distillation component and a cooling component.

[0008] The preheating assembly includes a preheating box and a heater. The preheating box is provided with a heating cavity. The heater is arranged in the heating cavity.

[0009] The membrane distillation assembly includes a connecting pipe, a concentration box, a membrane distillation box, a membrane fiber tube and a cold water pipe. The concentration box is provided with a feed passage. The membrane distillation box is arranged in the feed passage. The membrane distillation box divides the feed passage into an upper hot material chamber and a lower hot material chamber. One end of the connecting pipe is connected to the heating chamber, and the other end of the connecting pipe is connected to the upper hot material chamber. The lower hot material chamber is provided with a hot material outlet. An air gap channel, a first through hole and a second through hole are provided in the membrane distillation box. The first through hole and the second through hole are respectively connected to the air gap channel. The membrane fiber tube is penetrated in the first through hole. One end of the membrane fiber tube is connected to the upper hot material chamber, and the other end of the membrane fiber tube is connected to the lower hot material chamber. The cold water pipe is penetrated in the second through hole. A condensation outlet is provided at the bottom of the membrane distillation box, and the condensation outlet is connected to the air gap channel.

[0010] The cooling assembly includes a first cooling water tank, a second cooling water tank and a circulating pump. One end of the cold water pipe is connected to the first cooling water tank, and the other end of the cold water pipe is connected to the second cooling water tank. One end of the circulating pump is connected to the first cooling water tank, and the other end of the circulating pump is connected to the second cooling water tank.

[0011] In one embodiment, the membrane fiber tube is provided with a plurality of steam holes.

[0012] In one embodiment, the cooling component also includes a cooling coil and a circulating cold water source. The first cooling water tank is provided with a cooling inlet and a cooling outlet. The main body of the cooling coil is arranged in the first cooling water tank. Both ends of the cooling coil are passed through the cooling inlet and the cooling outlet. Both ends of the cooling coil are connected to the delivery end of the circulating cold water source.

[0013] In one embodiment, the preheating assembly further includes a filter plate, which divides the heating chamber into a first preheating chamber and a second preheating chamber, the heater is arranged in the second preheating chamber, the second preheating chamber is connected to the connecting pipe, and the filter plate is provided with a filter hole, and both ends of the filter hole are respectively connected to the first preheating chamber and the second preheating chamber.

[0014] In one embodiment, there are multiple filter holes, and two ends of the multiple filter holes are respectively connected to the first preheating chamber and the second preheating chamber.

[0015] In one embodiment, there are multiple first through holes, multiple membrane fiber tubes, multiple second through holes, and multiple cold water tubes.

[0016] In one embodiment, the plurality of cold water pipes and the plurality of membrane fiber tubes are arranged in parallel along the extension direction.

[0017] In one embodiment, a plurality of the first through holes and a plurality of the second through holes are alternately disposed in the membrane distillation box.

[0018] In one embodiment, the cooling assembly further includes a fluid replenishment tube, the second cooling water tank is provided with a fluid replenishment port, and the fluid replenishment tube is connected to the fluid replenishment port.

[0019] In one embodiment, the membrane distillation component further includes a condensation liquid outlet pipe, and the condensation liquid outlet pipe is connected to the condensation outlet.

[0020] Compared with the prior art, the present invention has at least the following advantages:

[0021] 1. In the above-mentioned wastewater treatment device, when the production wastewater of sodium fluorosilicate flows through the membrane fiber tube, water vapor passes through the membrane fiber tube and contacts the cold water pipe to generate condensation, and the condensed water can enter the workshop through the air gap channel through the condensation outlet for recycling. After the production wastewater of sodium fluorosilicate flows through the membrane fiber tube, the sulfuric acid concentration of the production wastewater of sodium fluorosilicate increases, and the concentrated production wastewater of sodium fluorosilicate flows from the hot material outlet into the phosphoric acid reaction tank for consumption, so that the condensed water and sulfuric acid separated from the production wastewater of sodium fluorosilicate are fully utilized, thereby reducing wastewater generation and reducing production costs;

[0022] 2. There is an air gap channel between the cold water pipe and the membrane fiber tube, so that the water vapor first enters the air gap channel and then contacts the cold water pipe for condensation, avoiding the direct contact between the membrane fiber tube and the cold water pipe to generate heat conduction, thereby reducing the heat loss of water vapor and effectively improving the heat utilization rate, thereby reducing the operating energy consumption of the wastewater treatment device;

[0023] 3. The production wastewater of sodium fluorosilicate is concentrated by cooperating among the preheating component, the membrane distillation component and the cooling component, so that the wastewater treatment device has a simple structure and is easy to install and maintain, and the production of sodium fluorosilicate is stable and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic structural diagram of a wastewater treatment device according to an embodiment;

[0026] Figure 2 for Figure 1 A partial structural schematic diagram of a wastewater treatment device shown;

[0027] Figure 3 for Figure 1 A schematic diagram of the structure of a membrane distillation module is shown;

[0028] Figure 4 for Figure 1 Schematic diagram of the partial structure of the membrane distillation component shown.

[0029] Figure numerals: 10-wastewater treatment device; 100-preheating component; 110-preheating box; 1101-heating chamber; 1102-first preheating chamber; 1103-second preheating chamber; 120-heater; 130-filter plate; 1301-filter hole; 200-membrane distillation component; 210-connecting pipe; 220-concentration box; 2201-material passage; 2202-upper hot material chamber; 2203-lower hot material chamber; 2204-hot material outlet; 230-membrane distillation Box; 2301-air gap channel; 2302-first through hole; 2303-second through hole; 2304-condensation outlet; 240-membrane fiber tube; 2401-steam through hole; 250-cold water pipe; 260-condensation liquid outlet pipe; 300-cooling component; 310-first cooling water tank; 3101-cooling inlet; 3102-cooling outlet; 320-second cooling water tank; 330-circulating pump; 340-cooling coil; 350-liquid replenishing pipe; 3201-liquid replenishing port. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0034] like Figure 1 As shown, it is a wastewater treatment device 10 according to an embodiment of the present disclosure, including a preheating component 100, a membrane distillation component 200 and a cooling component 300. The preheating component 100 includes a preheating box 110 and a heater 120. The preheating box 110 is provided with a heating chamber 1101. The heater 120 is arranged in the heating chamber 1101. The heater 120 can heat the production wastewater flowing into the preheating box 110, so that the temperature of the production wastewater increases.

[0035] like Figures 1 to 4As shown, further, the membrane distillation assembly 200 includes a connecting pipe 210, a concentration tank 220, a membrane distillation tank 230, a membrane fiber tube 240 and a cold water pipe 250. The concentration tank 220 is provided with a material transfer channel 2201. The membrane distillation tank 230 is arranged in the material transfer channel 2201. The membrane distillation tank 230 divides the material transfer channel 2201 into an upper layer hot material chamber 2202 and a lower layer hot material chamber 2203. One end of the connecting pipe 210 is connected to the heating chamber 2203. The other end of the connecting pipe 210 is connected to the upper layer hot material chamber 2202, and the lower layer hot material chamber 2203 is provided with a hot material outlet 2204. The membrane distillation box 230 is provided with an air gap channel 2301, a first through hole 2302 and a second through hole 2303. The first through hole 2302 and the second through hole 2303 are respectively connected to the air gap channel 2301. The membrane fiber tube 240 is passed through the first through hole 2302. Production waste water can flow, one end of the membrane fiber tube 240 is connected to the upper hot material chamber 2202, and the other end of the membrane fiber tube 240 is connected to the lower hot material chamber 2203. The cold water pipe 250 is passed through the second through hole 2303, and cooling water can flow in the cold water pipe 250. A condensation outlet 2304 is provided at the bottom of the membrane distillation box 230, and the condensation outlet 2304 is connected to the air gap channel 2301; the cooling component 300 includes a first cooling water tank 310, a second cooling water tank 320 and a circulating pump 330, one end of the cold water pipe 250 is connected to the first cooling water tank 310, and the other end of the cold water pipe 250 is connected to the second cooling water tank 320, one end of the circulating pump 330 is connected to the first cooling water tank 310, and the other end of the circulating pump 330 is connected to the second cooling water tank 320, and the circulating pump 330 can transport the cooling water in the first cooling water tank 310 to the second cooling water tank 320.

[0036] In this embodiment, the circulation pump 330 drives the cooling water to pass through the second cooling water tank 320, the cold water pipe 250 and the first cooling water tank 310 in sequence, and the cooling water then flows back from the first cooling water tank 310 to the second cooling water tank 320 for circulation, so that the wall temperature of the cold water pipe 250 is relatively low. During the production of sodium fluorosilicate in the workshop, production wastewater containing sodium fluorosilicate is generated. The production wastewater of sodium fluorosilicate is first introduced into the heating chamber 1101, and the heater 120 heats the production wastewater of sodium fluorosilicate. After heating, the high-temperature production wastewater enters the upper hot material chamber 2202 from the connecting pipe 210, and the high-temperature production wastewater flows along the membrane fiber tube 240 into the lower hot material chamber 2203. Due to the temperature difference between the high-temperature production wastewater and the air gap channel 2301 on both sides of the membrane fiber tube 240, the water in the production wastewater is driven by the steam pressure difference, and the water vapor molecules pass through the membrane fiber tube 240 into the air gap channel 2301. The water vapor in the air gap channel 2301 contacts the tube wall of the cold water pipe 250 and condenses, so that the condensed water gathers at the bottom of the air gap channel 2301, and the condensed water flows out from the condensation outlet 2304 and enters the workshop for recycling. The production wastewater flowing through the sodium fluorosilicate in the membrane fiber tube 240 is concentrated and then enters the lower hot material chamber 2203. The concentrated production wastewater of sodium fluorosilicate flows into the phosphoric acid reaction tank from the hot material outlet 2204 for consumption and utilization.

[0037] In the above-mentioned wastewater treatment device 10, when the production wastewater of sodium fluorosilicate flows through the membrane fiber tube 240, water vapor passes through the membrane fiber tube 240 and contacts with the cold water pipe 250 to generate condensation, and the condensed water can enter the workshop through the air gap channel 2301 through the condensation outlet 2304 for recycling. After the production wastewater of sodium fluorosilicate flows through the membrane fiber tube 240, the concentration of sulfuric acid in the production wastewater of sodium fluorosilicate increases. After concentration, the production wastewater of sodium fluorosilicate flows from the hot material outlet 2204 into the phosphoric acid reaction tank for consumption, so that the condensed water and sulfuric acid separated from the production wastewater of sodium fluorosilicate are fully utilized, thereby reducing the generation of wastewater and reducing the production cost; the cold water pipe There is an air gap channel 2301 between 250 and the membrane fiber tube 240, so that water vapor first enters the air gap channel 2301 and then contacts the cold water pipe 250 for condensation, avoiding heat conduction caused by direct contact between the membrane fiber tube 240 and the cold water pipe 250, thereby reducing the heat loss of water vapor and effectively improving the heat utilization rate, thereby making the operating energy consumption of the wastewater treatment device 10 lower; the production wastewater of sodium fluorosilicate is concentrated by the cooperation between the preheating component 100, the membrane distillation component 200 and the cooling component 300, so that the wastewater treatment device 10 has a simple structure and is easy to install and maintain, and the production of sodium fluorosilicate is stable and the production cost is low.

[0038] like Figure 4As shown, in one embodiment, the membrane fiber tube 240 is provided with a plurality of steam holes 2401. In this embodiment, water vapor can diffuse into the air gap channel 2301 along the steam holes 2401, and water vapor can simultaneously enter the air gap channel 2301 through the plurality of steam holes 2401, thereby improving the concentration effect of the production wastewater of sodium fluorosilicate.

[0039] like Figure 1 and Figure 2 As shown, in one embodiment, the cooling assembly 300 also includes a cooling coil 340 and a circulating cold water source, the first cooling water tank 310 is provided with a cooling inlet 3101 and a cooling outlet 3102, the main body of the cooling coil 340 is arranged in the first cooling water tank 310, the two ends of the cooling coil 340 are penetrated through the cooling inlet 3101 and the cooling outlet 3102, and the two ends of the cooling coil 340 are connected to the delivery end of the circulating cold water source. In this embodiment, the circulating cold water source is a workshop circulating water pipeline with a heat exchanger, and the water of the circulating cold water source has a lower temperature after heat exchange through the heat exchanger. The water of the circulating cold water source continuously flows into the cooling coil 340 and exchanges heat with the water in the first cooling water tank 310, so that the temperature of the water in the first cooling water tank 310 drops, thereby keeping the cold water pipe 250 through which the cooling water flows at a lower temperature.

[0040] like Figure 1 As shown, in one embodiment, the preheating assembly 100 further includes a filter plate 130, the filter plate 130 divides the heating chamber 1101 into a first preheating chamber 1102 and a second preheating chamber 1103, the heater 120 is disposed in the second preheating chamber 1103, the second preheating chamber 1103 is connected to the connecting pipe 210, and the filter plate 130 is provided with a filter hole 1301, and the two ends of the filter hole 1301 are respectively connected to the first preheating chamber 1102 and the second preheating chamber 1103. In this embodiment, the filter plate 130 can filter the solid impurities remaining in the sodium fluorosilicate production wastewater, so that the impurity content of the sodium fluorosilicate production wastewater that finally flows into the phosphoric acid reaction tank after concentration is small, thereby reducing the impact of the sodium fluorosilicate production wastewater on the production of the phosphoric acid reaction tank.

[0041] like Figure 1 As shown, in one embodiment, the number of the filter holes 1301 is multiple, and the two ends of the multiple filter holes 1301 are respectively connected to the first preheating chamber 1102 and the second preheating chamber 1103. In this embodiment, the multiple filter holes 1301 can increase the flow channel of the production wastewater of sodium fluorosilicate, so that the filtration speed is improved, so that the filtered production wastewater of sodium fluorosilicate quickly flows from the second preheating chamber 1103 into the upper hot material chamber 2202.

[0042] like Figure 2 and Figure 3As shown, in one embodiment, the number of the first through hole 2302, the membrane fiber tube 240, the second through hole 2303 and the cold water tube 250 is multiple. In this embodiment, the multiple cold water tubes 250 accelerate the speed of heat exchange and condensation of water vapor in the air gap channel 2301, and the multiple membrane fiber tubes 240 increase the amount of water vapor in the production wastewater that diffuses from the membrane fiber tube 240 into the air gap channel 2301, and accelerate the speed at which the production wastewater of sodium fluorosilicate flows from the upper hot material chamber 2202 to the lower hot material chamber 2203 through the membrane fiber tube 240, thereby improving the concentration effect and treatment speed of the production wastewater of sodium fluorosilicate.

[0043] like Figure 2 As shown, in one embodiment, a plurality of cold water pipes 250 and a plurality of membrane fiber tubes 240 are arranged in parallel along the extension direction. In this embodiment, the parallel arrangement of the cold water pipes 250 and the membrane fiber tubes 240 facilitates the cooling water to flow along the extension direction of the cold water pipes 250, and the production wastewater of sodium fluorosilicate flows along the extension direction of the membrane fiber tubes 240, and at the same time facilitates the operator to install the cold water pipes 250 in the second through hole 2303 and the membrane fiber tubes 240 in the first through hole 2302.

[0044] like Figure 3 As shown, in one embodiment, a plurality of first through holes 2302 and a plurality of second through holes 2303 are alternately arranged in the membrane distillation box 230. In this embodiment, a plurality of first through holes 2302 and a plurality of second through holes 2303 are alternately arranged, so that when the production wastewater flows through a plurality of membrane fiber tubes 240, the water vapor is evenly diffused in the membrane fiber tubes 240, and the water vapor entering the air gap channel 2301 is evenly heat-exchanged with the cold water tube 250, thereby increasing the speed at which the water vapor contacts the cold water tube 250 and condenses.

[0045] like Figure 1 As shown, in one embodiment, the cooling assembly 300 further includes a liquid infusion pipe 350, and the second cooling water tank 320 is provided with a liquid infusion port 3201, and the liquid infusion pipe 350 is connected to the liquid infusion port 3201. In this embodiment, the liquid infusion pipe 350 is installed with a switch valve, and the switch valve on the liquid infusion pipe 350 can control the opening and closing of the liquid infusion pipe 350. When the amount of cooling water in the first cooling water tank 310 and the second cooling water tank 320 is small, the cooling water can be added by opening the switch valve of the liquid infusion pipe 350. When cleaning is required, the cooling water can be released by opening the switch valve of the liquid infusion pipe 350, thereby facilitating the operator to maintain the cooling assembly 300.

[0046] like Figure 1As shown, in one embodiment, the membrane distillation assembly 200 further includes a condensate outlet pipe 260, which is connected to the condensate outlet 2304. In this embodiment, the condensate outlet pipe 260 is installed with a switch valve, and the switch valve on the condensate outlet pipe 260 can control the opening and closing of the condensate outlet pipe 260, so that the condensed water in the air gap channel 2301 flows out from the condensate outlet pipe 260, thereby controlling the flow rate of the condensed water flowing into the workshop, so that the condensed water flowing into the workshop can be quantitatively put into production.

[0047] Compared with the prior art, the present invention has at least the following advantages:

[0048] 1. In the above-mentioned wastewater treatment device 10, when the production wastewater of sodium fluorosilicate flows through the membrane fiber tube 240, water vapor passes through the membrane fiber tube 240 and contacts the cold water pipe 250 to generate condensation, and the condensed water can enter the workshop through the air gap channel 2301 through the condensation outlet 2304 for recycling. After the production wastewater of sodium fluorosilicate flows through the membrane fiber tube 240, the concentration of sulfuric acid in the production wastewater of sodium fluorosilicate increases. After concentration, the production wastewater of sodium fluorosilicate flows from the hot material outlet 2204 into the wet-process phosphoric acid reaction tank for consumption, so that the condensed water and sulfuric acid separated from the production wastewater of sodium fluorosilicate are fully utilized, thereby reducing wastewater generation and reducing production costs;

[0049] 2. An air gap channel 2301 is provided between the cold water pipe 250 and the membrane fiber pipe 240, so that water vapor first enters the air gap channel 2301 and then contacts the cold water pipe 250 for condensation, thereby avoiding direct contact between the membrane fiber pipe 240 and the cold water pipe 250 to generate heat conduction, thereby reducing the heat loss of water vapor and effectively improving the heat utilization rate, thereby reducing the operating energy consumption of the wastewater treatment device 10;

[0050] 3. The production wastewater of sodium fluorosilicate is concentrated by cooperating among the preheating component 100, the membrane distillation component 200 and the cooling component 300, so that the wastewater treatment device 10 has a simple structure and is easy to install and maintain, and the production of sodium fluorosilicate is stable and the production cost is low.

[0051] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A wastewater treatment device, characterized in that: It comprises a preheating component (100), a membrane distillation component (200) and a cooling component (300), The preheating assembly (100) comprises a preheating box (110) and a heater (120); the preheating box (110) is provided with a heating chamber (1101); and the heater (120) is arranged in the heating chamber (1101). The membrane distillation assembly (200) comprises a connecting pipe (210), a concentration tank (220), a membrane distillation tank (230), a membrane fiber tube (240) and a cold water pipe (250). The concentration tank (220) is provided with a material transfer channel (2201). The membrane distillation tank (230) is arranged in the material transfer channel (2201). The membrane distillation tank (230) divides the material transfer channel (2201) into an upper hot material chamber (2202) and a lower hot material chamber (2203). One end of the connecting pipe (210) is connected to the heating chamber (1101), and the other end of the connecting pipe (210) is connected to the upper hot material chamber (2202). The lower hot material chamber (2203) is provided with a hot material outlet (2204). The membrane distillation tank ( An air gap channel (2301), a first through hole (2302) and a second through hole (2303) are provided in the membrane distillation box (230), the first through hole (2302) and the second through hole (2303) are respectively connected to the air gap channel (2301), the membrane fiber tube (240) is passed through the first through hole (2302), one end of the membrane fiber tube (240) is connected to the upper layer hot material chamber (2202), and the other end of the membrane fiber tube (240) is connected to the lower layer hot material chamber (2203), the cold water pipe (250) is passed through the second through hole (2303), and a condensation outlet (2304) is provided at the bottom of the membrane distillation box (230), and the condensation outlet (2304) is connected to the air gap channel (2301); The cooling assembly (300) includes a first cooling water tank (310), a second cooling water tank (320) and a circulating pump (330); one end of the cold water pipe (250) is connected to the first cooling water tank (310), and the other end of the cold water pipe (250) is connected to the second cooling water tank (320); one end of the circulating pump (330) is connected to the first cooling water tank (310), and the other end of the circulating pump (330) is connected to the second cooling water tank (320).

2. The wastewater treatment device according to claim 1, characterized in that: The membrane fiber tube (240) is provided with steam holes (2401), and the number of the steam holes (2401) is multiple.

3. The wastewater treatment device according to claim 1, characterized in that: The cooling component (300) also includes a cooling coil (340) and a circulating cold water source. The first cooling water tank (310) is provided with a cooling inlet (3101) and a cooling outlet (3102). The main body of the cooling coil (340) is arranged in the first cooling water tank (310). Both ends of the cooling coil (340) are passed through the cooling inlet (3101) and the cooling outlet (3102). Both ends of the cooling coil (340) are connected to the delivery end of the circulating cold water source.

4. The wastewater treatment device according to claim 1, characterized in that: The preheating assembly (100) further comprises a filter plate (130), wherein the filter plate (130) divides the heating chamber (1101) into a first preheating chamber (1102) and a second preheating chamber (1103); the heater (120) is arranged in the second preheating chamber (1103); the second preheating chamber (1103) is connected to the connecting pipe (210); the filter plate (130) is provided with a filter hole (1301), and the two ends of the filter hole (1301) are respectively connected to the first preheating chamber (1102) and the second preheating chamber (1103).

5. The wastewater treatment device according to claim 4, characterized in that: There are multiple filter holes (1301), and both ends of the multiple filter holes (1301) are respectively connected to the first preheating chamber (1102) and the second preheating chamber (1103).

6. The wastewater treatment device according to claim 1, characterized in that: The number of the first through hole (2302), the membrane fiber tube (240), the second through hole (2303) and the cold water tube (250) is plural.

7. The wastewater treatment device according to claim 6, characterized in that: The plurality of cold water pipes (250) and the plurality of membrane fiber tubes (240) are arranged in parallel along the extension direction.

8. The wastewater treatment device according to claim 7, characterized in that: A plurality of the first through holes (2302) and a plurality of the second through holes (2303) are alternately arranged in the membrane distillation box (230).

9. The wastewater treatment device according to claim 1, characterized in that: The cooling assembly (300) further comprises a liquid replenishing tube (350), the second cooling water tank (320) is provided with a liquid replenishing port (3201), and the liquid replenishing tube (350) is connected to the liquid replenishing port (3201).

10. The wastewater treatment device according to claim 1, characterized in that: The membrane distillation assembly (200) further includes a condensation liquid outlet pipe (260), and the condensation liquid outlet pipe (260) is connected to the condensation outlet (2304).

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