Polluted acid wastewater treatment device

Abstract

The utility model relates to an acidic wastewater treatment device. The acidic wastewater treatment device comprises a pipeline mixer, a multi-channel reactor, a gas-liquid separator, a first solid-liquid separation tank and a second solid-liquid separation tank, the pipeline mixer is used for introducing the mixed sodium sulfide solution and hydrogen sulfide gas into the multi-channel reactor, the mixed sodium sulfide solution and hydrogen sulfide gas are uniformly divided into a plurality of channels through different-wave folded plates in the multi-channel reactor, liquid in each channel is independently and fully reacted and then is collected into the gas-liquid separator, and the separated hydrogen sulfide is collected into the pipeline mixer; generated liquid enters a first solid-liquid separation tank to precipitate large-particle arsenic slag, supernate flows into a second solid-liquid separation tank and is backwashed through an immersed ultrafiltration membrane, pollutants are flushed to the bottom of the second solid-liquid separation tank to be precipitated, sludge discharge ports are formed in the bottoms of the two solid-liquid separation tanks and used for conveying the arsenic slag to an arsenic slag dehydrator, and the arsenic slag dehydrator is used for dehydrating the arsenic slag. According to the solid-liquid separation device, the structure is simple, and the precipitation rate can be increased.

Description

Technical Field

[0001] The present application relates to the field of wastewater treatment, and particularly to a device for treating waste acid wastewater. Background Art

[0002] For the treatment methods of waste acid wastewater in the metallurgical industry, the commonly used methods mainly include the sulfide method and the lime (stone) neutralization method, etc. Among them, the sulfide method is applicable to the case where the arsenic content in the wastewater is greater than or equal to 500 mg / L, and the lime (stone) neutralization method is applicable to the case where the arsenic content in the wastewater is less than 500 mg / L.

[0003] For the above two methods, both require the wastewater and the reagent to react in the arsenic removal reaction tank, and a thickener is used to separate the solid and liquid. However, this method has the situation that the reaction time in the arsenic removal reaction tank is long and the reaction is prone to be incomplete. If it is desired to ensure that the reaction can be fully carried out, a large amount of reagent needs to be added to the wastewater, which is likely to cause waste of resources; at the same time, the neutralization product of the thickener precipitates slowly, resulting in a long thickening time. Utility Model Content

[0004] In view of this, the present application provides a device for treating waste acid wastewater, which has a simple structure, can improve its precipitation rate, and enhance its reaction effect at the same time.

[0005] According to one aspect of the present application, there is provided a device for treating waste acid wastewater, including: a pipe mixer, a multi-channel reactor, a gas-liquid separator, a first solid-liquid separation tank, and a second solid-liquid separation tank.

[0006] Two inlet ends are provided on the pipe mixer, which are respectively suitable for introducing a sodium sulfide solution and hydrogen sulfide gas, and a pipeline connection is provided between the outlet end of the pipe mixer and the inlet end of the multi-channel reactor; a pipeline connection is provided between the outlet end of the multi-channel reactor and the inlet end of the gas-liquid separator, and a plurality of corrugated baffles are arranged in the multi-channel reactor; a pipeline connection is provided between the gas outlet end of the gas-liquid separator and the gas inlet end of the pipe mixer, and a pipeline connection is provided between the liquid outlet end of the gas-liquid separator and the inlet end of the first solid-liquid separation tank; the first solid-liquid separation tank and the second solid-liquid separation tank are communicated, and the communication position is arranged at a position close to the top of the first solid-liquid separation tank. A water outlet is provided on the second solid-liquid separation tank, and the water outlet is suitable for being communicated to the outside of the device. An ultrafiltration membrane is arranged in the second solid-liquid separation tank, and an anti-flushing circuit is arranged on the ultrafiltration membrane; sludge discharge ports are arranged at positions close to the bottom of the first solid-liquid separation tank and the second solid-liquid separation tank, and both sludge discharge ports are connected to the inlet end of an arsenic residue dewatering machine through pipelines, and a pipeline connection is provided between the liquid outlet end of the arsenic residue dewatering machine and the inlet end of the first solid-liquid separation tank.

[0007] In a possible implementation manner, the backwashing circuit further includes: a water storage tank, a vacuum pump, and a backwashing pump. The ultrafiltration membrane is connected by a pipeline between the vacuum pump and the inlet end of the water storage tank, and the outlet end of the water storage tank is connected by a pipeline between the backwashing pump and the ultrafiltration membrane.

[0008] In a possible implementation manner, a sludge hopper is disposed near the bottom inside the first solid-liquid separation tank. The sludge hopper is an inverted quadrangular pyramid structure, and the top edge of the sludge hopper is attached to the inner wall of the first solid-liquid separation tank.

[0009] In a possible implementation manner, the sludge discharge port of the first solid-liquid separation tank is disposed at a position near the bottom of the sludge hopper, and the sludge discharge port of the first solid-liquid separation tank is communicated with the hopper.

[0010] In a possible implementation manner, a water outlet weir is disposed inside the first solid-liquid separation tank, and the set height of the water outlet weir is lower than the communication position between the first solid-liquid separation tank and the second solid-liquid separation tank.

[0011] In a possible implementation manner, a housing is disposed outside the gas-liquid separator, and the multi-channel reactor, the housing, the first solid-liquid separation tank, and the second solid-liquid separation tank are spliced along the length direction to form a cuboid structure.

[0012] In a possible implementation manner, a breathing port is opened on the housing, and the pipeline between the ultrafiltration membrane and the water storage tank is communicated through the breathing port.

[0013] In a possible implementation manner, a water inlet is disposed at the inlet end position of the multi-channel reaction; when the water inlet is disposed on the side wall of the multi-channel reactor, a plurality of the corrugated plates are arranged along the length direction of the multi-channel reactor; when the water inlet is disposed at the top or bottom of the multi-channel reactor, a plurality of the corrugated plates are arranged along the height of the multi-channel reactor.

[0014] In a possible implementation manner, the water outlet is disposed on the other side of the second solid-liquid separation tank opposite to the first solid-liquid separation tank.

[0015] Advantages of the present application: The pipeline mixer is used to mix the sodium sulfide solution and hydrogen sulfide gas. The mixed liquid is introduced into the multi-channel reactor and evenly divided into numerous channels by the corrugated plates therein. The liquid in each channel reacts independently and undergoes plug flow reaction along the direction of each channel. After sufficient reaction, the liquids in all channels are collected and enter the gas-liquid separator. The gas-liquid separator is in a negative pressure state, and the hydrogen sulfide gas escaping from the liquid surface is collected into the pipeline mixer. The liquid generated by the gas-liquid separator enters the first solid-liquid separation tank, where large-particle arsenic slag is mainly precipitated. The supernatant flows into the second solid-liquid separation tank. An immersed ultrafiltration membrane is provided in the second solid-liquid separation tank. Under the action of a vacuum pump, the clear liquid is continuously suctioned into the acid wastewater storage tank. When the vacuum pump reaches the set condition, the backwash pump is started, and the clear liquid passes through the immersed ultrafiltration membrane, and the pollutants on the ultrafiltration membrane are flushed into the second solid-liquid separation tank for precipitation. Drainage ports are provided at the bottoms of the first solid-liquid separation tank and the second solid-liquid separation tank to send the arsenic slag to the arsenic slag dehydrator, and the filtrate after dehydration is returned to the first solid-liquid separation tank. The dehydrated arsenic slag is discharged out of the device. According to a device for treating contaminated acid wastewater of the present application, its structure is simple, and it can improve its precipitation rate and enhance its reaction effect at the same time.

[0016] Other features and aspects of the present application will become clear from the following detailed description of the exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings included in and constituting a part of the specification, together with the specification, illustrate the exemplary embodiments, features, and aspects of the present application and are used to explain the principles of the present application.

[0018] Figure 1 Schematic connection structure diagram of the device for treating contaminated acid wastewater showing an embodiment of the present application;

[0019] Figure 2 Top view of the partial structure of the device for treating contaminated acid wastewater showing an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will detail various exemplary embodiments, features, and aspects of the present application with reference to the drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0021] Among them, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0023] As used herein, the term "exemplary" means "serving as an example, embodiment, or illustration". Any embodiment described herein as "exemplary" should not necessarily be construed as superior to or better than other embodiments.

[0024] In addition, for a better illustration of the present application, numerous specific details are given in the following detailed implementation manners. Those skilled in the art should understand that the present application can be implemented without some specific details. In some instances, methods, means, elements, and circuits well-known to those skilled in the art are not described in detail so as to highlight the gist of the present application.

[0025] As shown in the figure, the waste acid wastewater treatment device includes: a pipeline mixer 100, a multi-channel reactor 200, a gas-liquid separator 300, a first solid-liquid separation tank 400, and a second solid-liquid separation tank 500.

[0026] The pipeline mixer 100 is provided with two inlet ends, which are respectively suitable for introducing sodium sulfide solution and hydrogen sulfide gas. The outlet end of the pipeline mixer 100 is connected to the inlet end of the multi-channel reactor through a pipeline; the outlet end of the multi-channel reactor 200 is connected to the inlet end of the gas-liquid separator 300 through a pipeline. A plurality of corrugated baffles 210 are arranged in the multi-channel reactor 200; the gas outlet end of the gas-liquid separator 300 is connected to the gas inlet end of the pipeline mixer 100 through a pipeline, and the liquid outlet end of the gas-liquid separator 300 is connected to the inlet end of the first solid-liquid separation tank 400 through a pipeline; the first solid-liquid separation tank 400 and the second solid-liquid separation tank 500 are communicated, and the communication position is arranged at a position close to the top of the first solid-liquid separation tank 400. The second solid-liquid separation tank 500 is provided with a water outlet 550, and the water outlet 550 is suitable for being communicated to the outside of the device. An ultrafiltration membrane 510 is arranged in the second solid-liquid separation tank 500, and a backwashing circuit is arranged on the ultrafiltration membrane 510; sludge discharge ports 610 are arranged at positions close to the bottom of the first solid-liquid separation tank 400 and the second solid-liquid separation tank 500. Both sludge discharge ports 610 are connected to the inlet end of the arsenic residue dehydrator 630 through pipelines, and the liquid outlet end of the arsenic residue dehydrator 630 is connected to the inlet end of the first solid-liquid separation tank 400 through a pipeline.

[0027] The waste acid is introduced into the pipeline mixer 100, and the pipeline mixer 100 is provided with two chemical addition ports. Sodium sulfide solution and hydrogen sulfide gas are added into the pipeline mixer 100 through the two chemical addition ports respectively, and after being fully mixed in the pipeline mixer 100, they are sent to the multi-channel reactor 200 through the water inlet 220.

[0028] A plurality of corrugated baffles 210 are arranged in the multi-channel reactor 200. The corrugated baffles 210 divide the inside of the multi-channel reactor 200 into multiple channels. The liquid in each channel undergoes an independent reaction, and the reaction is in a plug flow along the setting direction of each channel, and the upward flow and the downward flow alternate. After sufficient reaction, the liquid at the outlets of all channels converges and enters the gas-liquid separator 300.

[0029] The inside of the gas-liquid separator 300 is in a negative pressure state. The hydrogen sulfide gas escaping from the liquid surface is collected at the hydrogen sulfide chemical addition port of the pipeline mixer 100, and the liquid separated in the gas-liquid separator 300 enters the first solid-liquid separation tank 400.

[0030] In the first solid-liquid separation tank 400, the precipitation of large-particle arsenic residue is mainly realized. The large-particle arsenic residue precipitates to the sludge hopper by gravity, and the supernatant flows to the second solid-liquid separation tank 500 after passing through the weir 420.

[0031] An immersion ultrafiltration membrane 510 is provided in the second solid-liquid separation tank 500. Under the action of a vacuum pump 530, the clear liquid is continuously suctioned into the acidic wastewater storage tank 520. When the vacuum pump 530 reaches the set vacuum degree, the operation of the vacuum pump 530 is stopped, and the backwash pump 540 is started. The clear liquid is passed through the immersion ultrafiltration membrane 510 to backflush the pollutants on the surface of the membrane filaments into the second solid-liquid separation tank 500.

[0032] The arsenic residues at the bottoms of the first solid-liquid separation tank 400 and the second solid-liquid separation tank 500 are discharged through the sludge discharge port 610, and are sent to the arsenic residue dehydrator 630 through the arsenic residue transfer pump 620. The filtrate after dehydration returns to the first solid-liquid separation tank 400, and the arsenic residue after dehydration is discharged for external treatment of the device.

[0033] In a possible implementation manner, the backwashing circuit further includes: a storage tank 520, a vacuum pump 530, and a backwash pump 540. The ultrafiltration membrane 510 is connected by a pipeline between the vacuum pump 530 and the inlet end of the storage tank 520, and the outlet end of the storage tank 520 is connected by a pipeline between the backwash pump 540 and the ultrafiltration membrane 510.

[0034] In a possible implementation manner, a sludge hopper 410 is provided near the bottom inside the first solid-liquid separation tank 400. The sludge hopper 410 is an inverted quadrangular pyramid structure, and the top edge of the sludge hopper 410 is fitted with the inner wall of the first solid-liquid separation tank 400.

[0035] In a possible implementation manner, the sludge discharge port 610 of the first solid-liquid separation tank 400 is provided at a position near the bottom of the sludge hopper 410, and the sludge discharge port 610 of the first solid-liquid separation tank 400 is communicated with the hopper.

[0036] In a possible implementation manner, a water outlet weir 420 is provided inside the first solid-liquid separation tank 400, and the set height of the water outlet weir 420 is lower than the communication position between the first solid-liquid separation tank 400 and the second solid-liquid separation tank 500.

[0037] In a possible implementation manner, the gas-liquid separator 300 is externally coated with a housing. The multi-channel reactor 200, the housing, the first solid-liquid separation tank 400, and the second solid-liquid separation tank 500 are spliced along the length direction to form a cuboid structure, where the length direction described in this application is Figure 1 the left-right direction shown.

[0038] In a possible implementation manner, a breathing port 310 is opened on the housing, and the pipeline between the ultrafiltration membrane 510 and the storage tank 520 is communicated through the breathing port 310.

[0039] In a possible implementation manner, a water inlet 220 is provided at the inlet end of the multi-channel reaction; when the water inlet 220 is provided on the side wall of the multi-channel reactor 200, a plurality of corrugated plates 210 are arranged along the length direction of the multi-channel reactor 200; when the water inlet 220 is provided at the top or bottom of the multi-channel reactor 200, a plurality of corrugated plates 210 are arranged along the height of the multi-channel reactor 200.

[0040] In a possible implementation manner, the water outlet 550 is provided on the other side of the second solid-liquid separation tank 500 opposite to the first solid-liquid separation tank 400.

[0041] It should be noted that although a waste acid wastewater treatment device is introduced by taking this application as an example as above, those skilled in the art can understand that this application should not be limited thereto. In fact, users can flexibly set each parameter according to personal preferences and / or actual application scenarios as long as the design is reasonable.

[0042] In this way, the pipeline mixer is used to mix the sodium sulfide solution and hydrogen sulfide gas, and the mixed liquid is introduced into the multi-channel reactor. The liquid is evenly divided into numerous channels through the corrugated plates therein. The liquid in each channel reacts independently and undergoes plug flow reaction along the direction of each channel. After sufficient reaction, the liquid in all channels converges and enters the gas-liquid separator. The gas-liquid separator is in a negative pressure state, and the hydrogen sulfide gas escaping from the liquid surface is collected into the pipeline mixer. The liquid generated by the gas-liquid separator enters the first solid-liquid separation tank. In the first solid-liquid separation tank, large-particle arsenic slag is mainly precipitated. The supernatant flows into the second solid-liquid separation tank. An immersed ultrafiltration membrane is arranged in the second solid-liquid separation tank. Under the action of a vacuum pump, the clear liquid is continuously sucked into the acid wastewater storage tank. When the vacuum pump reaches the set condition, the backwash pump is started, and the clear liquid passes through the immersed ultrafiltration membrane, and the pollutants on the ultrafiltration membrane are flushed into the second solid-liquid separation tank for precipitation. Drainage ports are provided at the bottoms of the first solid-liquid separation tank and the second solid-liquid separation tank to send the arsenic slag to the arsenic slag dehydrator, and the filtrate after dehydration is returned to the first solid-liquid separation tank. The dehydrated arsenic slag is discharged out of the device. According to a waste acid wastewater treatment device of the present application, its structure is simple, and it can improve its precipitation rate and enhance its reaction effect at the same time.

[0043] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technologies in the market, or to enable other ordinary technical personnel in the technical field to understand the embodiments disclosed herein.

Claims

1. A device for treating acid wastewater, characterized in that: include: A pipeline mixer, a multi-channel reactor, a gas-liquid separator, a first solid-liquid separation tank and a second solid-liquid separation tank; The pipeline mixer is provided with two inlet ends, which are respectively suitable for introducing sodium sulfide solution and hydrogen sulfide gas, and the outlet end of the pipeline mixer is connected to the inlet end of the multi-channel reaction by a pipeline; The outlet end of the multi-channel reactor is connected to the inlet end of the gas-liquid separator by a pipeline, and a plurality of folded plates are arranged in the multi-channel reactor; The gas outlet end of the gas-liquid separator is connected to the gas inlet end of the pipeline mixer through a pipeline, and the liquid outlet end of the gas-liquid separator is connected to the inlet end of the first solid-liquid separation tank through a pipeline; The first solid-liquid separation tank is connected to the second solid-liquid separation tank, and the connection position is set at a position close to the top of the first solid-liquid separation tank. The second solid-liquid separation tank is provided with a water outlet, and the water outlet is suitable for connecting to the outside of the device. An ultrafiltration membrane is provided in the second solid-liquid separation tank, and a backwashing circuit is provided on the ultrafiltration membrane. The first solid-liquid separation tank and the second solid-liquid separation tank are both provided with mud discharge ports near the bottom, and the two mud discharge ports are connected to the inlet end of the arsenic slag dehydrator through pipelines, and the liquid outlet end of the arsenic slag dehydrator is connected to the inlet end of the first solid-liquid separation tank by a pipeline.

2. The acid wastewater treatment device according to claim 1, characterized in that: The backwash circuit also includes: a water storage tank, a vacuum pump and a backwash pump. The ultrafiltration membrane is connected to the inlet end of the water storage tank through a pipeline between the vacuum pump and the water storage tank, and the outlet end of the water storage tank is connected to the ultrafiltration membrane through a pipeline between the backwash pump and the ultrafiltration membrane.

3. The dirty acid wastewater treatment device according to any one of claims 1-2, characterized in that: A sludge cone bucket is arranged near the bottom of the first solid-liquid separation tank. The sludge cone bucket is an inverted quadrangular pyramid structure, and the top edge of the sludge cone bucket is arranged in contact with the inner wall of the first solid-liquid separation tank.

4. The acid wastewater treatment device according to claim 3, characterized in that: The mud discharge port of the first solid-liquid separation tank is arranged at a position close to the bottom of the sludge cone bucket, and the mud discharge port of the first solid-liquid separation tank is connected to the cone bucket.

5. The acid wastewater treatment device according to claim 3, characterized in that: A water outlet weir is arranged in the first solid-liquid separation tank, and the height of the water outlet weir is lower than the connecting position of the first solid-liquid separation tank and the second solid-liquid separation tank.

6. The acid wastewater treatment device according to claim 2, characterized in that: The gas-liquid separator is covered with a shell, and the multi-channel reactor, the shell, the first solid-liquid separation tank and the second solid-liquid separation tank are spliced ​​along the length direction to form a rectangular structure.

7. The acid wastewater treatment device according to claim 6, characterized in that: The shell is provided with a breathing port, and the pipeline between the ultrafiltration membrane and the water storage tank is connected through the breathing port.

8. The acid wastewater treatment device according to claim 6, characterized in that: A water inlet is provided at the inlet end of the multi-channel reaction; When the water inlet is arranged on the side wall of the multi-channel reactor, a plurality of the folded plates are arranged in an array along the length direction of the multi-channel reactor; When the water inlet is arranged at the top or the bottom of the multi-channel reactor, a plurality of the corrugated plates are arranged along the height of the multi-channel reactor.

9. The acid wastewater treatment device according to claim 6, characterized in that: The water outlet is disposed on the other side of the second solid-liquid separation tank opposite to the first solid-liquid separation tank.

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