A wastewater treatment system

Abstract

The utility model relates to wastewater treatment field discloses a wastewater treatment system, include: boiler, have steam export and thick water export, multi -effect evaporimeter, including along linear arrangement's multi -effect evaporative case, and the thick water chamber is formed in the evaporative case inside, is provided with condensing unit and spray pipe in thick water chamber, and the spray pipe's spray outlet faces condensing unit, and the steam export is connected in the condensing unit in the evaporative case arranged in the first side, in two adjacent effect evaporative cases, the gas of condensing unit in last effect evaporative case enters the condensing unit in next effect evaporative case, and the liquid of thick water chamber in last effect evaporative case enters the thick water chamber in next effect evaporative case, water ring vacuum pump is used for generating negative pressure from the condensing unit in the evaporative case arranged in the end side, feed liquid pump is used for supplying liquid to multiple spray pipes, and thick water pump is used for generating negative pressure from the thick water chamber in the evaporative case arranged in the end side, the utility model improves overall evaporation efficiency, reduces the energy consumption needed to the wastewater treatment.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment and discloses a wastewater treatment system. Background Technology

[0002] If metallurgical wastewater is discharged directly without treatment, it will not only lead to energy waste and increased production costs, but also pollute the surrounding environment and disrupt the ecological balance. Therefore, metallurgical wastewater needs to be treated before it is discharged to ensure that the effluent meets the standards for process water.

[0003] The hydrometallurgical processes of cobalt and nickel generate large quantities of ammonium sulfate wastewater with high COD and metal ion content. Current pretreatment methods aim to remove COD and metal ions as much as possible to purify the ammonium sulfate solution. The purified solution is typically then concentrated through evaporation. However, current wastewater treatment systems have low evaporation efficiency for ammonium sulfate solution. When wastewater is passed into heating equipment, it undergoes only one evaporation process, making it difficult to effectively utilize the heat generated by the equipment to improve evaporation efficiency. Therefore, a wastewater treatment system with higher evaporation efficiency is urgently needed. Utility Model Content

[0004] The purpose of this utility model is to provide a wastewater treatment system to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] A wastewater treatment system according to a first aspect of the present invention includes: a boiler having a steam outlet and a concentrate outlet; a multi-effect evaporator including multi-effect evaporation chambers arranged in a straight line, wherein a concentrate chamber is formed inside the evaporation chamber, a condenser and a spray pipe are provided in the concentrate chamber, the spray outlet of the spray pipe faces the condenser, and the steam outlet is connected to the condenser in the first evaporation chamber; in two adjacent evaporation chambers, uncondensed steam in the condenser of the previous evaporation chamber and gas generated by evaporation in the concentrate chamber enter the condenser in the next evaporation chamber together, and liquid in the concentrate chamber of the previous evaporation chamber enters the concentrate chamber of the next evaporation chamber; a water ring vacuum pump for generating negative pressure in the multi-effect evaporation chamber; a feed pump for supplying liquid to the multiple spray pipes; and a concentrate discharge pump for extracting unevaporated liquid from the concentrate chamber.

[0006] This technical solution has at least the following beneficial effects: Wastewater at a certain temperature is added to the boiler for heating and evaporation. The generated steam enters the multi-effect evaporator from the steam outlet, and the evaporated solution also enters the multi-effect evaporator from the concentrate outlet. The multi-effect evaporator has multiple evaporators arranged in a straight line. A water ring vacuum pump creates a vacuum in the evaporation tank, forming a vacuum inside the evaporation tank. The greater the distance from the water ring vacuum pump, the lower the vacuum degree of the evaporation tank, and the higher the saturation evaporation temperature of the liquid. When the water ring vacuum pump creates a negative pressure in the evaporation tank, it can also remove non-condensable gases, thereby improving vacuum efficiency and steam efficiency. The steam generated by the boiler first enters the exhaust... In the condenser section of the first evaporator, a feed pump supplies wastewater to the spray pipes of that evaporator. The wastewater is then sprayed onto the condenser section, forming a primary evaporation. This spraying creates a liquid film on the condenser, effectively improving steam formation efficiency. The wastewater after primary evaporation flows into the concentrated water at the bottom of the concentrated water chamber and enters the next-effect evaporator for further heating and evaporation. Similarly, the steam from the primary evaporation and the uncondensed boiler steam also enter the condenser section of the next-effect evaporator. Because the vacuum level of this evaporator is relatively higher than that of the previous evaporator, the saturation evaporation temperature of the liquid is relatively lower. At this point, wastewater is continuously supplied to the spray pipes for secondary evaporation. In this way, the wastewater is heated and evaporated in the boiler, and the heat from the resulting concentrated water and steam is used to heat the evaporators with increasing vacuum levels. Multiple evaporation processes are also performed in the multi-effect evaporators, effectively recovering and utilizing the heat generated in the system, improving overall evaporation efficiency, and reducing energy consumption for wastewater treatment.

[0007] According to some embodiments of the present invention, the condensation section includes a plurality of upper condensing pipes and a plurality of lower condensing pipes connected to the two inner sides of the evaporator, and a first pipe seal and a second pipe seal respectively disposed on the two outer sides of the evaporator. One end of the plurality of upper condensing pipes is respectively connected to the first pipe seal, and the other end of the plurality of upper condensing pipes and one end of the plurality of lower condensing pipes are respectively connected to the second pipe seal. The other end of the plurality of lower condensing pipes is respectively provided with an air inlet, and the first pipe seal is provided with a first air outlet.

[0008] According to some embodiments of this utility model, the area within the concentrated water chamber between the spray pipe and the upper condenser pipe at the top is a spray zone, and a second air outlet is provided on the side of the evaporator where the second pipe seal is located. The first air outlet and the second air outlet are respectively connected to the spray zone.

[0009] According to some embodiments of the present invention, connecting boxes are respectively provided on both sides of the evaporator, the first tube seal and the second tube seal are respectively located in the two connecting boxes, and the two connecting boxes between two adjacent evaporators are connected to each other.

[0010] According to some embodiments of the present invention, a first drain pipe is connected to the bottom side of the first pipe seal, and the bottom of the first drain pipe is bent upward to form a first water trap. A second drain pipe is connected to the bottom side of the second pipe seal, and the bottom of the second drain pipe is bent upward to form a second water trap.

[0011] According to some embodiments of the present invention, the present invention also includes a condensate pump, which is used to extract condensate from the inside of the connecting box arranged at the end, and a condensate drain pipe is connected between the bottom sides of the two connecting boxes located on both sides of the evaporator.

[0012] According to some embodiments of the present invention, the present invention also includes a condenser, wherein multiple heat exchange tubes are arranged on both sides inside the condenser, and a condensate inlet and a condensate outlet are respectively arranged on both sides of the bottom of the condenser. The feed pump is connected to one end of the multiple heat exchange tubes, and the other end of the multiple heat exchange tubes is respectively connected to the multiple spray pipes through pipelines. The connecting box arranged at the end is connected to the condensate inlet through pipelines, and the condensate pump is connected to the condensate outlet through pipelines.

[0013] According to some embodiments of this utility model, the top two sides of the condenser are respectively provided with a steam inlet and an exhaust outlet, the connecting box arranged at the end is connected to the steam inlet through a pipeline, and the exhaust outlet is connected to the water ring vacuum pump through a pipeline.

[0014] According to some embodiments of the present invention, between two adjacent evaporators, an intermediate feed pipe is connected between the concentrate chamber of the upper evaporator and the spray pipe of the lower evaporator. An intermediate feed pump is provided on the intermediate feed pipe, and the intermediate feed pump is used to make the liquid in the intermediate feed pipe flow from the concentrate chamber to the spray pipe.

[0015] According to some embodiments of the present invention, the concentrate chamber arranged at the end is provided with a return pipe connected to a plurality of spray pipes, and the concentrate pump can cause the liquid in the return pipe to flow from the concentrate chamber to the plurality of spray pipes.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model, in which the dashed lines indicate the flow path of gas inside the multi-effect evaporator.

[0019] Figure 2 yes Figure 1 A magnified view of part A.

[0020] In the attached diagram: 100-boiler, 110-steam outlet, 120-concentrate outlet, 210-evaporator, 211-concentrate chamber, 220-spray pipe, 231-upper condenser pipe, 232-lower condenser pipe, 233-first pipe seal, 234-second pipe seal, 235-first drain pipe, 236-second drain pipe, 240-connection box, 300-water ring vacuum pump, 400-feed pump, 500-concentrate drain pump, 510-reflux pipe, 610-condensate pump, 620-condensate drain pipe, 710-condenser, 720-heat exchanger tube, 810-intermediate feed pipe, 820-intermediate feed pump. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] In the description of this application, the use of terms such as "one embodiment," "some embodiments," "an example," "some instances," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] Reference Figure 1 and Figure 2According to a first aspect of the present invention, a wastewater treatment system includes a boiler 100, a multi-effect evaporator, a water ring vacuum pump 300, a feed pump 400, and a concentrate discharge pump 500. The boiler 100 has a steam outlet 110 and a concentrate outlet 120. The multi-effect evaporator includes multi-effect evaporation chambers 210 arranged in a straight line. For example, the number of evaporation chambers 210 can be two, three, or four. A concentrate chamber 211 is formed inside each evaporation chamber 210. A condenser and a spray pipe 220 are provided within the concentrate chamber 211. The spray outlet of the spray pipe 220 faces the condenser. The steam outlet 110 is connected to the condenser in the first evaporation chamber 210. In two adjacent evaporation chambers 210, the uncondensed steam from the condenser in the previous evaporation chamber 210 and the concentrate are discharged. The gas generated by evaporation in evaporator 211 enters the condenser section of the next-effect evaporator 210. The liquid in the concentrate chamber 211 of the previous-effect evaporator 210 enters the concentrate chamber 211 of the next-effect evaporator 210. In practical applications, the condenser sections of the previous-effect evaporator 210 and the condenser sections of the next-effect evaporator 210 can be directly connected through pipelines, or through other guiding structures to achieve directional gas flow. Similarly, the liquid in the concentrate chamber 211 of the previous-effect evaporator 210 can also be directly connected to the concentrate chamber 211 of the next-effect evaporator 210 through pipelines. The water ring vacuum pump 300 is used to generate negative pressure in the multi-effect evaporator 210. The feed pump 400 is used to supply liquid to the multiple spray pipes 220. The concentrate discharge pump 500 is used to extract the unevaporated liquid in the concentrate chamber 211.

[0028] As described above, wastewater at a certain temperature is added to boiler 100 for heating and evaporation. The generated steam enters the multi-effect evaporator from steam outlet 110, and the evaporated solution also enters the multi-effect evaporator from concentrated water outlet 120. The multi-effect evaporator has multiple evaporators arranged in a straight line. A water ring vacuum pump 300 creates a vacuum in evaporation tank 210, forming a vacuum inside evaporation tank 210. The greater the distance from the water ring vacuum pump 300, the lower the vacuum degree of evaporation tank 210, and the higher the saturation evaporation temperature of the liquid. When the water ring vacuum pump 300 creates a negative pressure in evaporation tank 210, it can also remove non-condensable gases, thereby improving vacuum efficiency and steam efficiency. The steam generated by boiler 100 first enters the evaporation tank 210 arranged on the first side. In the condenser section of 10, the feed pump 400 supplies wastewater to the spray pipe 220 of the evaporator 210. The wastewater is sprayed onto the condenser section through the spray pipe 220, forming a primary evaporation. The formation of a liquid film on the condenser section through spraying can effectively improve the steam formation efficiency. The wastewater after primary evaporation flows into the concentrated water at the bottom of the concentrated water chamber 211 and enters the next-effect evaporator 210 for heating and evaporation. Similarly, the steam after primary evaporation and the uncondensed steam from the boiler 100 also enter the condenser section of the next-effect evaporator 210. Since the vacuum degree of this evaporator 210 is relatively higher than that of the previous-effect evaporator 210, the saturated evaporation temperature of the liquid is relatively lower. At this time, wastewater is continued to be supplied to the spray pipe 220, and secondary evaporation can be carried out in this evaporator 210. In this way, the wastewater is heated and evaporated in the boiler 100, and the heat from the resulting concentrated water and steam is used to heat the evaporator 210, which has a higher vacuum. Multiple evaporation processes are also carried out in the multi-effect evaporator 210, thereby effectively recovering and utilizing the heat generated in the system, improving the overall evaporation efficiency, and reducing the energy consumption required for wastewater treatment.

[0029] As a specific embodiment of the condensation section, the condensation section includes a plurality of upper condensing pipes 231 and a plurality of lower condensing pipes 232 connected to the two inner sides of the evaporator 210, and a first pipe seal 233 and a second pipe seal 234 respectively disposed on the two outer sides of the evaporator 210. One end of the plurality of upper condensing pipes 231 is connected to the first pipe seal 233, and the other end of the plurality of upper condensing pipes 231 and one end of the plurality of lower condensing pipes 232 are respectively connected to the second pipe seal 234. The other end of the plurality of lower condensing pipes 232 is respectively provided with an air inlet, and the first pipe seal 233 is provided with a first air outlet. Steam delivered from boiler 100 steam outlet 110 reaches the multi-effect evaporator. It first enters the multiple lower condenser tubes 232 through the air inlets of the multiple lower condenser tubes 232 arranged on the first side of the evaporator 210. When the gas flows along the lower condenser tubes 232 to the second tube seal 234, it exchanges heat with the inside of the concentrate chamber 211 once. Then, it turns back into the multiple upper condenser tubes 231 in the second tube seal 234, and then flows in the opposite direction from the multiple upper condenser tubes 231 into the first tube seal 233 in the evaporator 210, and is discharged from the first air outlet of the first tube seal 233. During the process of the gas flowing in the multiple upper condenser tubes 231, it exchanges heat with the inside of the concentrate chamber 211 a second time. This can prolong the path of the steam flow in the concentrate chamber 211 and improve the efficiency of steam heat collection and utilization.

[0030] Furthermore, the area within the concentrated water chamber 211 between the spray pipe 220 and the upper condenser pipe 231 at the top is designated as the spray zone. A second vent is provided on the side of the evaporator 210 where the second pipe seal 234 is located. The first vent and the second vent are respectively connected to the spray zone. The steam discharged from the first vent of the first pipe seal 233 flows back into the evaporator 210 to reheat the wastewater sprayed into the concentrated water chamber 211. The steam generated from the spray pipe 220 spraying onto the condenser section also mixes with the steam at the top of the concentrated water tank and is then discharged through the second vent to the next-effect evaporator 210.

[0031] In order to transfer the gas from the condenser section of the previous evaporator 210 to the condenser section of the next evaporator 210, in this embodiment, connecting boxes 240 are respectively provided on both sides of the evaporator 210. The first pipe seal 233 and the second pipe seal 234 are respectively located in the two connecting boxes 240, and the two connecting boxes 240 between adjacent evaporators 210 are connected to each other. The connecting boxes 240 located on both sides of the evaporator 210 form gas flow spaces on both sides of the evaporator 210. The steam sent from the steam outlet 110 can be directly sent into the connecting box 240 on one side of the first evaporator 210. At this time, the gas can flow in the connecting box 240 to the air inlet formed by multiple lower condenser pipes 232, and thus enter the condenser section. The gas flowing out of the condenser section from the second air outlet enters the connecting box 240 on the other side of the evaporator 210, and so on, entering the next evaporator 210 and repeating this process.

[0032] The condensate generated inside the upper condenser pipe 231 and the lower condenser pipe 232 can flow to the first pipe seal 233 and the second pipe seal 234 at both ends. At this time, the first pipe seal 233 and the second pipe seal 234 can be provided with a structure to drain the condensate. In this embodiment, the bottom side of the first pipe seal 233 is connected to a first drain pipe 235, and the bottom of the first drain pipe 235 is bent upward to form a first water trap. The bottom side of the second pipe seal 234 is connected to a second drain pipe 236, and the bottom of the second drain pipe 236 is bent upward to form a second water trap. In practical applications, the shape of the first water trap and the second water trap can be U-shaped. Condensate entering the first pipe seal 233 flows into the first drain pipe 235 and is discharged into the connecting box 240 through the first drain pipe 235. Since the bottom of the first drain pipe 235 is bent upward to form a first water trap, the first water trap can temporarily store the condensate and act as a water seal at the bottom of the first drain pipe 235, thereby preventing steam from being discharged into the connecting box 240 through the first drain pipe 235. Similarly, condensate entering the second pipe seal 234 flows into the second drain pipe 236 and is discharged into the connecting box 240 through the second drain pipe 236. Since the bottom of the second drain pipe 236 is bent upward to form a second water trap, the second water trap can temporarily store the condensate and act as a water seal at the bottom of the second drain pipe 236, thereby preventing steam from being discharged into the connecting box 240 through the second drain pipe 236.

[0033] To better collect the generated condensate, this embodiment of the invention also includes a condensate pump 610. The condensate pump 610 is used to extract condensate from the connecting boxes 240 located at the end of the evaporator. A condensate drain pipe 620 is connected between the bottom sides of the two connecting boxes 240 located on both sides of the evaporator. The condensate pump 610 generates a negative pressure suction force from the connecting boxes 240 located at the end of the evaporator to extract the condensate. The condensate in the connecting boxes 240 on one side of the evaporator 210 can enter the connecting box 240 on the other side of the evaporator 210 through the condensate drain pipe 620, flowing sequentially through multiple connecting boxes 240, and finally being discharged and collected. The generated condensate meets the standards for process water, achieving a larger water production capacity.

[0034] This utility model also includes a condenser 710, wherein multiple heat exchange tubes 720 are arranged on both sides inside the condenser 710, and a condensate inlet and a condensate outlet are respectively arranged on both sides of the bottom of the condenser 710. A feed pump 400 is connected to one end of the multiple heat exchange tubes 720, and the other end of the multiple heat exchange tubes 720 are respectively connected to multiple spray pipes 220 through pipelines. A connecting box 240 arranged at the end is connected to the condensate inlet through a pipeline, and a condensate pump 610 is connected to the condensate outlet through a pipeline. Wastewater at a certain temperature is fed into the multiple heat exchange tubes 720 of the condenser 710 by the feed pump 400 and discharged together with the condensate generated inside the condenser 710 during operation. The condensate generated inside the condenser 710 during operation is extracted by the condensate pump 610 and recycled as process water.

[0035] In practical applications, in the initial stage, wastewater at a certain temperature enters the boiler 100 for heating and evaporation. The generated steam enters the condenser 710 through the multi-effect evaporator to preheat the wastewater, so that the wastewater reaches the saturation temperature and enters each effect evaporator in parallel. In addition, scale inhibitors and defoamers can be added to the wastewater during the process of entering the evaporator to optimize the operating effect.

[0036] Furthermore, the condenser 710 has a steam inlet and an exhaust outlet on its top two sides, respectively. The connecting box 240, located at the end, is connected to the steam inlet via a pipe, and the exhaust outlet is connected to the water ring vacuum pump 300 via a pipe. Steam from the evaporator 210 located at the end enters the condenser 710, where it is condensed into liquid condensate, which is then extracted and recovered by the condensate pump 610. The non-condensable gases contained therein are sent to the water ring vacuum pump 300 through the exhaust outlet, where the water ring vacuum pump 300 discharges the non-condensable gases.

[0037] After evaporation in the first-effect evaporator 210, part of the concentrated water is pumped under pressure to the bottom of the next-effect evaporator 210 to form a natural convection evaporation layer. The remaining concentrated water can also be sprayed into the spray pipe 220 of the next-effect evaporator 210. Specifically, between two adjacent evaporators 210, an intermediate feed pipe 810 is connected between the concentrated water chamber 211 of the previous evaporator 210 and the spray pipe 220 of the next evaporator 210. An intermediate feed pump 820 is installed on the intermediate feed pipe 810. The intermediate feed pump 820 is used to make the liquid in the intermediate feed pipe 810 flow from the concentrated water chamber 211 to the spray pipe 220. During operation, the intermediate feed pump 820 sends a portion of the concentrated water produced in the previous saving tank into the spray pipe 220 of the next effect evaporator 210, where it is mixed with the wastewater supplied by the feed pump 400 and sprayed in the spray pipe 220 to form a falling film evaporation layer. Since the temperature of the concentrated water sent from the intermediate feed pump 820 is still relatively high, flash evaporation will occur when it enters the next evaporator 210 with a higher vacuum degree for spraying, thus further improving the efficiency of wastewater evaporation.

[0038] After evaporation in the last evaporator 210, some of the concentrated water may not meet the discharge standards. In practical applications, a salinity meter can be used for sampling and measurement. Therefore, in this embodiment, the concentrated water chamber 211 located at the end is provided with a return pipe 510 connected to multiple spray pipes 220. The concentrated water pump 500 allows the liquid in the return pipe 510 to flow from the concentrated water chamber 211 to the multiple spray pipes 220. The concentrated water after evaporation in the last evaporator 210 is pumped to the return pipe 510 by the concentrated water pump 500. After passing through the return pipe 510, it is mixed with fresh wastewater of different concentrations and temperatures replenished by the feed pump 400. Then, it re-enters the spray pipes 220 at the top of each evaporator 210 for spray evaporation. This allows for better control of the discharged concentrated water to meet discharge requirements. In practical applications, the liquid can be directly discharged or pumped to the return pipe 510 via a valve.

[0039] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A wastewater treatment system, characterized in that: include: The boiler (100) has a steam outlet (110) and a concentrated water outlet (120). A multi-effect evaporator includes multi-effect evaporator boxes (210) arranged in a straight line. A concentrate chamber (211) is formed inside the evaporator box (210). A condenser section and a spray pipe (220) are provided in the concentrate chamber (211). The spray outlet of the spray pipe (220) faces the condenser section. The steam outlet (110) is connected to the condenser section in the first evaporator box (210). In two adjacent evaporator boxes (210), the uncondensed steam in the condenser section of the previous evaporator box (210) and the gas generated by evaporation in the concentrate chamber (211) enter the condenser section in the next evaporator box (210). The liquid in the concentrate chamber (211) of the previous evaporator box (210) enters the concentrate chamber (211) of the next evaporator box (210). A water ring vacuum pump (300) is used to generate negative pressure inside the multi-effect evaporator (210); A feed pump (400) is used to supply liquid to the plurality of said spray pipes (220); A concentrate pump (500) is used to extract the unevaporated liquid from the concentrate chamber (211).

2. The wastewater treatment system according to claim 1, characterized in that: The condensation section includes multiple upper condenser tubes (231) and multiple lower condenser tubes (232) connected to the two inner sides of the evaporator (210), and a first tube seal (233) and a second tube seal (234) respectively disposed on the two outer sides of the evaporator (210). One end of each of the multiple upper condenser tubes (231) is connected to the first tube seal (233), and the other end of each of the multiple upper condenser tubes (231) and one end of each of the multiple lower condenser tubes (232) are connected to the second tube seal (234). The other end of each of the multiple lower condenser tubes (232) is provided with an air inlet, and the first tube seal (233) is provided with a first air outlet.

3. The wastewater treatment system according to claim 2, characterized in that: The area within the concentrated water chamber (211) between the spray pipe (220) and the upper condenser pipe (231) at the top is the spray zone. The evaporator (210) is provided with a second air outlet on the side where the second pipe seal (234) is located. The first air outlet and the second air outlet are respectively connected to the spray zone.

4. The wastewater treatment system according to claim 3, characterized in that: The evaporator (210) is provided with connecting boxes (240) on both sides. The first tube seal (233) and the second tube seal (234) are located in the two connecting boxes (240) respectively. The two connecting boxes (240) between two adjacent evaporators (210) are connected to each other.

5. A wastewater treatment system according to claim 4, characterized in that: The bottom side of the first pipe seal (233) is connected to a first drain pipe (235), and the bottom of the first drain pipe (235) is bent upward to form a first water trap. The bottom side of the second pipe seal (234) is connected to a second drain pipe (236), and the bottom of the second drain pipe (236) is bent upward to form a second water trap.

6. A wastewater treatment system according to claim 5, characterized in that: It also includes a condensate pump (610) for drawing condensate from the inside of the connecting box (240) arranged at the end, and a condensate drain pipe (620) is connected between the bottom sides of the two connecting boxes (240) located on both sides of the evaporator.

7. A wastewater treatment system according to claim 6, characterized in that: It also includes a condenser (710), which has multiple heat exchange tubes (720) arranged on both sides inside the condenser (710). The bottom sides of the condenser (710) are respectively provided with a condensate inlet and a condensate outlet. The feed pump (400) is connected to one end of the multiple heat exchange tubes (720). The other end of the multiple heat exchange tubes (720) is respectively connected to the multiple spray pipes (220) through pipelines. The connecting box (240) arranged at the end is connected to the condensate inlet through pipelines. The condensate pump (610) is connected to the condensate outlet through pipelines.

8. A wastewater treatment system according to claim 7, characterized in that: The condenser (710) has a steam inlet and an exhaust outlet on its top two sides respectively. The connecting box (240) arranged at the end is connected to the steam inlet through a pipe, and the exhaust outlet is connected to the water ring vacuum pump (300) through a pipe.

9. A wastewater treatment system according to claim 1, characterized in that: Between two adjacent evaporators (210), an intermediate feed pipe (810) is connected between the concentrate chamber (211) of the previous evaporator (210) and the spray pipe (220) of the next evaporator (210). An intermediate feed pump (820) is provided on the intermediate feed pipe (810), and the intermediate feed pump (820) is used to make the liquid in the intermediate feed pipe (810) flow from the concentrate chamber (211) to the spray pipe (220).

10. A wastewater treatment system according to claim 1, characterized in that: The concentrate chamber (211) arranged at the end is provided with a return pipe (510) connected to a plurality of spray pipes (220), and the concentrate pump (500) can make the liquid in the return pipe (510) flow from the concentrate chamber (211) to the plurality of spray pipes (220).

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