Acid mine wastewater treatment equipment

Abstract

The embodiment of the utility model provides acid mine wastewater treatment equipment. The acid mine wastewater treatment equipment comprises a reactor and a gas supply device, the reactor comprises a container and a membrane assembly arranged in the container, the membrane assembly is used for attaching a biological membrane and provided with a gas inlet, and the gas supply device is communicated with the gas inlet of the membrane assembly and used for supplying a gaseous electron donor to the membrane assembly. According to the acid mine wastewater treatment equipment disclosed by the embodiment of the utility model, the biological activity of sulfate reducing bacteria is relatively strong, the sulfate reducing efficiency is relatively high, metal precipitates are easy to precipitate and collect, and the difficulty and the cost of callback to neutrality are relatively low and even callback to neutrality is not needed.

Description

Technical Field

[0001] This utility model relates to the field of water treatment, specifically to an acidic mine wastewater treatment device. Background Technology

[0002] Acidic mine wastewater is a highly acidic solution. Its main pollutants are heavy metal ions and sulfates produced by the contact oxidation of metal sulfides during mineral mining. It also contains high concentrations of metals such as copper, arsenic, aluminum, zinc, and iron. Related technologies utilize biological methods to remove SO42- from the water under anaerobic conditions using sulfate-reducing bacteria. 2- Restore to S 2- S 2- Sulfate-reducing bacteria can combine with various heavy metals in acidic mine wastewater to form sulfides, thus achieving precipitation and removal. However, they are still affected by heavy metal ions and sulfur dioxide in the acidic mine wastewater. 2- The problem of inhibition leads to low biological activity and low sulfate reduction efficiency of sulfate-reducing bacteria. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose an acidic mine wastewater treatment device.

[0005] The acidic mine wastewater treatment equipment of this utility model embodiment includes:

[0006] A reactor and a gas supply device, the reactor comprising a container and a membrane module disposed within the container, the membrane module being used to attach a biofilm, the membrane module being provided with an air inlet, and the gas supply device being connected to the air inlet of the membrane module for supplying a gaseous electron donor to the membrane module.

[0007] This embodiment of the acidic mine wastewater treatment equipment uses a container to hold both acidic mine wastewater and sulfate-reducing bacteria. The membrane module within the container serves as a carrier for the sulfate-reducing bacteria to attach and grow, providing a stable growth environment conducive to their growth and accumulation. This allows the sulfate-reducing bacteria to form a biofilm on the membrane module and avoids the problem of difficult separation caused by the mixing of sulfate-reducing bacteria and metal precipitates. A gas supply device supplies gaseous electron donors to the membrane module, avoiding the use of liquid electron donors such as sodium lactate, ethanol, or formic acid, which could further acidify the acidic mine wastewater and increase the difficulty of neutralization. The gaseous electron donors are provided to the attached biofilm by the membrane filaments of the membrane module, thus completing the transfer between the gas and solid phases with fewer mass transfer steps, resulting in high mass transfer efficiency. Therefore, this embodiment of the acidic mine wastewater treatment equipment exhibits strong biological activity of sulfate-reducing bacteria, high sulfate reduction efficiency, easy precipitation and collection of metal precipitates, and low difficulty and cost of neutralization, or even eliminates the need for neutralization altogether.

[0008] In some embodiments, the gaseous electron donor includes hydrogen and / or methane.

[0009] In some embodiments, the reactor further includes a membrane thickness control device disposed within the container and movable along the surface of the membrane assembly.

[0010] In some embodiments, the container is provided with an exhaust port, and the membrane assembly is provided with an air outlet;

[0011] The acidic mine wastewater treatment equipment also includes a gas collection device, which is connected to the exhaust port and / or the outlet to collect the gas discharged from the exhaust port and / or the outlet.

[0012] In some embodiments, the reactor further includes an aerator disposed below the membrane module and connected to the gas collection device to receive and aerate gas supplied by the gas collection device.

[0013] In some embodiments, the container is provided with an inlet pipe and an outlet, the inlet pipe being used to supply wastewater into the container, and the outlet of the inlet pipe being flush with or lower than the bottom of the membrane module.

[0014] The acidic mine wastewater treatment equipment also includes an alkali addition device, which is connected to the inlet pipe and is used to supply alkali solution to the inlet pipe.

[0015] In some embodiments, the container includes a three-phase separator, a main body, and a sludge discharge hopper connected sequentially from top to bottom. The three-phase separator is provided with the exhaust port and the drain port, the main body is provided with the water inlet pipe, and the sludge discharge hopper is provided with the sludge discharge port.

[0016] In some embodiments, the reactors are at least two connected in sequence, and the drain outlet of the preceding reactor is connected to the inlet pipe of the following reactor.

[0017] In some embodiments, the alkali addition device includes an alkali source, an alkali addition pipe, and a valve. The alkali addition pipe has an inlet end and at least two outlet ends. The alkali source is connected to the inlet end. Each inlet pipe is connected to a corresponding outlet end. Each outlet end is provided with a corresponding valve to control the opening and closing of the outlet end.

[0018] In some embodiments, the alkali addition device further includes a pH sensor and a control terminal. Each container is provided with a corresponding pH sensor. The pH sensor is electrically connected to the control terminal to transmit the detected pH value to the control terminal. The control terminal is electrically connected to each valve to control the opening and closing of the valve located on the same container as the pH sensor according to the pH value transmitted by the pH sensor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an acidic mine wastewater treatment device according to an embodiment of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of an acidic mine wastewater treatment device according to an embodiment of the present invention. Figure 2 .

[0021] Figure label:

[0022] 1. Reactor; 11. Container; 111. Exhaust port; 112. Inlet pipe; 113. Outlet; 114. Three-phase separator; 115. Main body; 116. Sludge hopper; 117. Sludge outlet; 12. Membrane module; 121. Air inlet; 122. Air outlet; 13. Aerator; 2. Air supply device; 3. Gas collection device; 4. Alkali addition device; 41. Outlet end; 42. Valve. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] The following is for reference. Figure 1 and Figure 2 This invention describes an acidic mine wastewater treatment device according to an embodiment of the present invention.

[0025] like Figure 1 and Figure 2 As shown, the acidic mine wastewater treatment equipment of this utility model embodiment includes a reactor 1 and an air supply device 2.

[0026] The reactor 1 includes a container 11 and a membrane module 12 disposed in the container 11. The membrane module 12 is used to attach a biofilm. The membrane module 12 is provided with an air inlet 121. The gas supply device 2 is connected to the air inlet 121 of the membrane module 12 and is used to supply gaseous electron donors to the membrane module 12.

[0027] For example, such as Figure 1 As shown, reactor 1 includes container 11 and membrane module 12. Container 11 is preferably, but not limited to, vertically arranged. Membrane module 12 is provided inside container 11. Membrane module 12 is preferably, but not limited to, vertically arranged. Gas supply device 2 is located at least partially outside reactor 1 and is connected to gas inlet 121 of membrane module 12.

[0028] When the acidic mine wastewater treatment equipment is in use, container 11 contains acidic mine wastewater and sulfate-reducing bacteria. The sulfate-reducing bacteria attach to the surface of membrane module 12 and form a biofilm. Gas supply device 2 supplies gaseous electron donors to membrane module 12. The gaseous electron donors are provided to the attached biofilm by the membrane filaments of membrane module 12, enabling the sulfate-reducing bacteria to reduce SO4 in the acidic mine wastewater. 2- Restore to S 2- S 2- It combines with various heavy metals in acidic mine wastewater to form metal sulfides, and causes the metal sulfides to precipitate.

[0029] The acidic mine wastewater treatment equipment of this utility model contains acidic mine wastewater and sulfate-reducing bacteria in a container. The membrane module inside the container serves as a carrier for the sulfate-reducing bacteria to attach and grow, thereby providing a stable growth environment that is conducive to the growth and enrichment of sulfate-reducing bacteria. This allows the sulfate-reducing bacteria to form a biofilm on the membrane module and avoids the problem of sulfate-reducing bacteria being difficult to separate from metal precipitates.

[0030] The gas supply device supplies gaseous electron donors to the membrane module, avoiding the problem that the addition of liquid electron donors such as sodium lactate, ethanol, and formic acid would further acidify the acidic mine wastewater and increase the difficulty of neutralizing the acidic mine wastewater.

[0031] The gaseous electron donor is provided to the attached biofilm by the membrane filaments of the membrane module. The gaseous electron donor is transferred through the gas phase formed by the gaseous electron donor and the solid phase formed by the biofilm. There are fewer mass transfer links, thereby improving the mass transfer efficiency.

[0032] Therefore, in the acidic mine wastewater treatment equipment of this utility model embodiment, the sulfate-reducing bacteria have strong biological activity, high sulfate reduction efficiency, easy precipitation and collection of metal precipitates, and low difficulty and cost of neutralization, or even no need for neutralization.

[0033] In some embodiments, the membrane assembly 12 includes at least one of a plate membrane, a spiral wound membrane, and a tubular membrane made of acid and alkali resistant hollow fiber membrane filaments, wherein the hollow space of the membrane filaments is used for the flow of gaseous electron donors.

[0034] In some embodiments, the gaseous electron donor includes hydrogen and / or methane.

[0035] like Figure 1 As shown, the gas supply device 2 includes a gas source and a gas supply pipe. The gas source is preferably, but not limited to, a gas tank for storing gaseous electron donors. The gas supply pipe is connected between the gas source and the gas inlet 121. Preferably, the gas supply pipe is equipped with a pressurizing pump, a gas flow meter and a regulating valve.

[0036] The gas source can store hydrogen, methane, or a mixture of hydrogen and methane. Hydrogen and / or methane are supplied to the attached biofilm via the membrane filaments of membrane module 12, enabling sulfate-reducing bacteria to remove SO42- from the acidic mine wastewater. 2- The process reduces and generates hydrogen sulfide gas, which mixes with acidic mine wastewater and combines with various heavy metals in the wastewater to form metal sulfides. The alkalinity generated can replace the addition of reagents for pH adjustment of the wastewater, reducing the difficulty and cost of restoring neutrality.

[0037] Meanwhile, since hydrogen and / or methane are provided by the membrane filaments of membrane module 12, sulfate-reducing bacteria attach to the surface of membrane module 12 to form a biofilm, thus achieving high hydrogen sulfide yield and alkalinity yield, and improving the generation efficiency of metal sulfides.

[0038] In some embodiments, reactor 1 further includes a membrane thickness control device (not shown), which is disposed inside container 11 and is movable along the surface of membrane assembly 12.

[0039] Specifically, the membrane thickness control device preferably includes, but is not limited to, an actuator and a scraper. The actuator is connected to the inner wall of the container 11 or to the frame of the membrane module 12. The scraper is connected to the actuator and has a predetermined distance from the surface of the membrane module 12. The actuator drives the scraper to move along the surface of the membrane module 12 to peel off the metal precipitates attached to the membrane module 12 and to peel off the portion of the biofilm that exceeds the predetermined distance, so as to maintain the thickness of the biofilm, thereby ensuring that the biofilm has high activity and sulfate reduction efficiency, and avoiding the biofilm from being too thick and increasing mass transfer resistance.

[0040] In some embodiments, the container 11 is provided with an exhaust port 111, and the membrane assembly 12 is provided with an exhaust port 122.

[0041] like Figure 1 As shown, the top of the container 11 is provided with an exhaust port 111, and the hydrogen sulfide gas generated inside the container 11 flows upward and is discharged from the exhaust port 111.

[0042] The membrane module 12 has an inlet 121 at the top and an outlet 122 at the bottom. Hydrogen and / or methane enter the membrane module 12 through the inlet 121 and then flow downward along the hollow space of the membrane filaments. During the flow, the hydrogen and / or methane are supplied to the biofilm through the membrane filaments. The remaining hydrogen and / or methane that are not supplied to the biofilm are discharged from the outlet 122. The hydrogen and / or methane move from top to bottom in the membrane filaments, enabling the biofilm to form a high hydrogen sulfide yield and alkalinity yield.

[0043] The acidic mine wastewater treatment equipment also includes a gas collection device 3, which is connected to an exhaust port 111 and / or an outlet 122 to collect the gas discharged from the exhaust port 111 and / or the outlet 122.

[0044] like Figure 1 As shown, the gas collection device 3 preferably includes, but is not limited to, a collection tank and two gas collection pipes. One gas collection pipe is connected between the exhaust port 111 and the collection tank to collect the hydrogen sulfide gas discharged from the exhaust port 111 into the collection tank, preventing the hydrogen sulfide gas from being released into the atmosphere and causing air pollution. The other gas collection pipe is connected between the exhaust port 122 and the collection tank to collect the hydrogen and / or methane discharged from the exhaust port 122 into the collection tank, preventing the remaining hydrogen and / or methane from entering the container 11 and then being discharged into the atmosphere through the exhaust port 111, causing air pollution.

[0045] In some embodiments, the reactor 1 further includes an aerator 13, which is disposed below the membrane module 12 and is connected to a gas collection device 3 to receive and aerate the gas provided by the gas collection device 3.

[0046] like Figure 1 As shown, reactor 1 also includes an aerator 13, which is located inside container 11 and below membrane module 12. The aerator 13 is preferably, but not limited to, connected to a collection tank of gas collection device 3 via a pipeline equipped with a pressure pump. The mixed gas in the collection tank is supplied to the aerator 13 and discharged from the aerator 13 into container 11 to form a high-speed gas flow from bottom to top, thereby stripping hydrogen sulfide gas generated by biofilm, so that hydrogen sulfide gas is fully mixed and contacted with acidic mine wastewater to fully generate metal sulfides, while reducing the toxicity of hydrogen sulfide gas to biofilm and ensuring that sulfate-reducing bacteria have strong activity.

[0047] In some embodiments, the container 11 is provided with an inlet pipe 112 and an outlet 113. The inlet pipe 112 is used to supply wastewater into the container 11, and the outlet of the inlet pipe 112 is flush with or lower than the bottom of the membrane module 12.

[0048] like Figure 1 As shown, container 11 is provided with inlet pipe 112 and outlet 113. Inlet pipe 112 is used to supply acidic mine wastewater into container 11. The outlet of inlet pipe 112 is flush with or lower than the bottom of membrane module 12 so that the wastewater can fully contact and react with the biofilm attached to membrane module 12 after entering the container. Outlet 113 is located at the top of container 11 to discharge the treated wastewater.

[0049] It should be noted that sulfate-reducing bacteria can be manually or by a feeding device added to container 11 before the acidic mine wastewater treatment equipment is put into operation, or they can be supplied to container 11 along with the wastewater through inlet pipe 112.

[0050] The acidic mine wastewater treatment equipment also includes an alkali addition device 4, which is connected to the inlet pipe 112 and is used to supply alkali solution to the inlet pipe 112.

[0051] like Figure 1 As shown, the alkali addition device 4 is connected to the water inlet pipe 112 to provide alkali solution to the water inlet pipe 112. The alkali solution is mixed with the acidic mine wastewater in the water inlet pipe 112 and supplied into the container 11 together, thereby adjusting the pH value of the wastewater in the container 11 to reach the initial pH value for metal sulfide precipitation, so as to promote the precipitation of metal sulfides to the bottom of the container 11.

[0052] Aerator 13 also serves to stir the alkaline solution to enhance the mixing effect.

[0053] In some embodiments, the container 11 includes a three-phase separator 114, a main body 115 and a sludge discharge hopper 116 connected from top to bottom. The three-phase separator 114 is provided with an exhaust port 111 and a drain port 113, the main body 115 is provided with a water inlet pipe 112, and the sludge discharge hopper 116 is provided with a sludge discharge port 117.

[0054] like Figure 1 As shown, the container 11 includes a three-phase separator 114, a main body 115 and a sludge discharge hopper 116 connected in sequence from top to bottom. In other words, the three-phase separator 114 is located at the top of the main body 115 and the sludge discharge hopper 116 is located at the bottom of the main body 115.

[0055] The membrane module 12 and aerator 13 are located inside the main body 115. The water inlet pipe 112 is located at the bottom of the main body 115 and penetrates the wall of the main body 115. Therefore, the outlet of the water inlet pipe 112 and the aerator 13 are both located above the sludge discharge hopper 116 to avoid water flow and air flow disturbing the sediment in the sludge discharge hopper 116.

[0056] The three-phase separator 114 is provided with an exhaust port 111, a drain port 113 and a mud discharge port. The exhaust port 111 and the drain port 113 are both located at the top of the three-phase separator 114, and the mud discharge port is located at the bottom of the three-phase separator 114 and communicates with the inner cavity of the main body 115.

[0057] Acidic mining wastewater enters the main body 115 through the inlet pipe 112. Under the action of high-speed gas generated by the aerator 13, it circulates vertically within the main body 115. During the flow, the acidic mining wastewater comes into full contact with the biofilm attached to the membrane module 12 and mixes thoroughly with the hydrogen sulfide gas generated by the biofilm, thereby producing metal sulfides. Larger metal sulfides fall and settle into the sludge hopper 116, while smaller metal sulfides, such as flocculent metal sulfides, flow upward with part of the acidic mining wastewater and enter the three-phase separator 114 through the sludge outlet. The three-phase separator 114 separates the hydrogen sulfide gas, the treated wastewater, and the metal sulfides. The hydrogen sulfide gas is discharged through the exhaust port 111, and the treated wastewater is discharged through the drain port 113. The separated smaller metal sulfides aggregate to increase their volume and then fall back into the main body 115 through the sludge outlet, continuing to fall and settle into the sludge hopper 116.

[0058] The membrane thickness control device also controls the metal precipitates and biofilm that are peeled off from the membrane module 12 and fall and settle into the sludge discharge hopper 116.

[0059] The sludge discharge hopper 116 is preferably a cone shape with a cross-section that decreases from top to bottom, so as to facilitate the accumulation of sediment at the bottom of the sludge discharge hopper 116. The bottom of the sludge discharge hopper 116 is provided with an openable and closable sludge discharge port 117, which is used to discharge the sediment in the sludge discharge hopper 116.

[0060] In some embodiments, there are at least two reactors 1 connected in sequence, and the drain outlet 113 of the preceding reactor 1 is connected to the inlet pipe 112 of the following reactor 1.

[0061] like Figure 2 As shown, reactor 1 consists of at least two reactors connected sequentially from left to right, preferably three or more. In adjacent reactors 1, the drain outlet 113 of the left reactor 1 is connected to the inlet pipe 112 of the right reactor 1. In other words, along the direction of sequential connection, the drain outlet 113 of the upstream reactor 1 in adjacent reactors 1 is connected to the inlet pipe 112 of the downstream reactor 1.

[0062] The inlet pipe 112 of the upstream reactor 1 is connected to the wastewater source. The acidic mine wastewater provided by the wastewater source passes through at least two reactors 1 in sequence and is treated. Finally, it is discharged from the outlet 113 of the downstream reactor 1 to achieve a stronger wastewater treatment effect.

[0063] The gas supply device 2, gas collection device 3, and alkali addition device 4 can each be provided in at least two corresponding to reactor 1, or each can be provided in only one and connected to all reactors 1.

[0064] In some embodiments, the alkali addition device 4 includes an alkali source, an alkali addition pipe, and a valve 42. The alkali addition pipe has an inlet end and at least two outlet ends 41. The alkali source is connected to the inlet end. Each water inlet pipe 112 is connected to a corresponding outlet end 41. Each outlet end 41 is provided with a corresponding valve 42 to control the opening and closing of the outlet end 41.

[0065] like Figure 2 As shown, the alkali addition device 4 includes an alkali source, an alkali addition pipe, and a valve 42. The alkali source is preferably, but not limited to, an alkali storage tank. The alkali addition pipe has an inlet end and at least two outlet ends 41 connected in parallel. The inlet end is connected to the alkali source, and the outlet ends 41 are connected to the water inlet pipe 112 of the corresponding reactor 1. Each reactor 1's water inlet pipe 112 is connected to at least one outlet end 41. The alkali provided by the alkali source is supplied to the water inlet pipe 112 of each reactor 1 via the alkali addition pipe.

[0066] Each outlet end 41 is equipped with a corresponding valve 42 to control the opening and closing of the outlet end 41, thereby controlling whether the alkali solution is supplied into the corresponding water inlet pipe 112.

[0067] The amount of alkaline solution supplied to the corresponding inlet pipe 112 is controlled by opening and closing valve 42, thereby controlling the pH value in each container 11. Since different metal ions have different solubility products and initial precipitation pH values, by controlling at least two containers 11 to have different pH values, metal sulfides of different metal ions are generated and precipitated in each container 11. The metal sulfides of different metal ions are collected separately and treated accordingly to facilitate the recovery of different metals. For example, the pH value in at least two containers 11 increases in the direction of sequential connection.

[0068] It should be noted that the opening and closing of the control valve 42 controls the amount of alkali solution supplied to the corresponding inlet pipe 112. This can be achieved by connecting each inlet pipe 112 to an outlet end 41, and controlling the amount of alkali solution supplied to the corresponding inlet pipe 112 by controlling the different opening durations of the control valve 42. Alternatively, the number of outlet ends 41 connected to the inlet pipe 112 can be different, or the number of outlet ends 41 connected can be the same but all connected to multiple outlet ends 41, with each valve 42 having the same opening duration. The amount of alkali solution supplied to the corresponding inlet pipe 112 is controlled by the number of outlet ends 41 connected to the inlet pipe 112.

[0069] It is understood that the alkali adding device 4 is not limited to including an alkali source, an alkali adding pipe and a valve 42. In some other embodiments, the alkali adding device 4 is an openable and closable container located on the water inlet pipe 112, which contains alkali and needs to be added periodically.

[0070] In some embodiments, the alkali addition device 4 further includes a pH sensor and a control terminal. Each container 11 is provided with a corresponding pH sensor. The pH sensor is electrically connected to the control terminal to transmit the detected pH value to the control terminal. The control terminal is electrically connected to each valve 42 to control the opening and closing of the valve 42 located on the same container 11 as the pH sensor according to the pH value transmitted by the pH sensor.

[0071] Specifically, the alkali addition device 4 also includes a pH sensor and a control terminal. Each container 11 is equipped with a corresponding pH sensor. All pH sensors and all valves 42 are electrically connected to the control terminal. The pH sensor detects the actual pH value in the corresponding container 11 and transmits the actual pH value to the control terminal. The control terminal has a preset pH value that is manually input and compares the actual pH value with the preset pH value. When the actual pH value is less than the preset pH value, the control terminal controls the valve 42 on the inlet pipe 112 of the container 11 corresponding to the actual pH value to open, so as to supply alkali solution to the container 11, thereby adjusting the actual pH value in the container 11. At the same time, the pH sensor transmits the actual pH value in real time. When the actual pH value is greater than or equal to the preset pH value, the control terminal controls the valve 42 to close. Thus, the alkali addition device 4 can automatically and in real time adjust the pH value of each container 11 to achieve graded precipitation and selective recovery of different metals.

[0072] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation 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.

[0073] Furthermore, the terms "first" and "second" are used only for distinction and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0075] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0076] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An acidic mine wastewater treatment device, characterized in that, include: The reactor (1) includes a container (11) and a gas supply device (2). The reactor (1) includes a container (11) and a membrane module (12) disposed in the container (11). The membrane module (12) is used to attach a biofilm. The membrane module (12) is provided with an air inlet (121). The gas supply device (2) is connected to the air inlet (121) of the membrane module (12) and is used to supply gaseous electron donors to the membrane module (12).

2. The acidic mine wastewater treatment equipment according to claim 1, characterized in that, The gaseous electron donor includes hydrogen and / or methane.

3. The acidic mine wastewater treatment equipment according to claim 1, characterized in that, The reactor (1) further includes a membrane thickness control device disposed inside the container (11) and movable along the surface of the membrane assembly (12).

4. The acidic mine wastewater treatment equipment according to claim 1, characterized in that, The container (11) is provided with an exhaust port (111), and the membrane module (12) is provided with an air outlet (122); The acidic mine wastewater treatment equipment also includes a gas collection device (3), which is connected to the exhaust port (111) and / or the outlet (122) to collect the gas discharged from the exhaust port (111) and / or the outlet (122).

5. The acidic mine wastewater treatment equipment according to claim 4, characterized in that, The reactor (1) further includes an aerator (13) located below the membrane module (12) and connected to the gas collection device (3) to receive and aerate the gas provided by the gas collection device (3).

6. The acidic mine wastewater treatment equipment according to claim 5, characterized in that, The container (11) is provided with an inlet pipe (112) and a drain outlet (113). The inlet pipe (112) is used to supply wastewater into the container (11). The outlet of the inlet pipe (112) is flush with or lower than the bottom of the membrane module (12). The acidic mine wastewater treatment equipment also includes an alkali addition device (4), which is connected to the water inlet pipe (112) and is used to provide alkali solution to the water inlet pipe (112).

7. The acidic mine wastewater treatment equipment according to claim 6, characterized in that, The container (11) includes a three-phase separator (114), a main body (115), and a sludge discharge hopper (116) connected from top to bottom. The three-phase separator (114) is provided with an exhaust port (111) and a drain port (113). The main body (115) is provided with a water inlet pipe (112). The sludge discharge hopper (116) is provided with a sludge discharge port (117).

8. The acidic mine wastewater treatment equipment according to claim 6, characterized in that, The reactors (1) are at least two connected in sequence, and the drain outlet (113) of the preceding reactor (1) is connected to the inlet pipe (112) of the following reactor (1).

9. The acidic mine wastewater treatment equipment according to claim 8, characterized in that, The alkali addition device (4) includes an alkali source, an alkali addition pipe and a valve (42). The alkali addition pipe has an inlet end and at least two outlet ends (41). The alkali source is connected to the inlet end. Each water inlet pipe (112) is connected to the corresponding outlet end (41). Each outlet end (41) is provided with a corresponding valve (42) to control the opening and closing of the outlet end (41).

10. The acidic mine wastewater treatment equipment according to claim 9, characterized in that, The alkali addition device (4) also includes a pH sensor and a control terminal. Each container (11) is provided with a corresponding pH sensor. The pH sensor is electrically connected to the control terminal to transmit the detected pH value to the control terminal. The control terminal is electrically connected to each valve (42) to control the opening and closing of the valve (42) located on the same container (11) as the pH sensor according to the pH value transmitted by the pH sensor.

Images