Acid mine wastewater treatment equipment

Abstract

The embodiment of the invention 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 invention, 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] The invention relates to the field of water treatment, and in particular to acid mine wastewater treatment equipment. Background Art

[0002] Acid mine drainage is a highly acidic solution. Its main pollutants are heavy metal ions and sulfates produced by contact oxidation of metal sulfides during mineral mining. Acid mine drainage also contains high concentrations of metals such as copper, arsenic, aluminum, zinc and iron. In related technologies, biological methods are used to use sulfate-reducing bacteria to reduce SO4 2- Restore to S 2- , S 2- Combined with various heavy metals in acid mine drainage to form sulfides, sulfate-reducing bacteria are removed by precipitation. However, sulfate-reducing bacteria are still affected by heavy metal ions and S in acid mine drainage. 2- The inhibition problem leads to low biological activity of sulfate-reducing bacteria and low sulfate reduction efficiency. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides an acid mine wastewater treatment device.

[0005] The acid mine wastewater treatment equipment of the embodiment of the present invention comprises:

[0006] A reactor and a gas supply device, wherein the reactor comprises a container and a membrane assembly arranged in the container, the membrane assembly is used for attaching a biofilm, the membrane assembly is provided with an air inlet, and the gas supply device is connected to the air inlet of the membrane assembly and is used for supplying a gaseous electron donor to the membrane assembly.

[0007] The acid mine wastewater treatment equipment of the embodiment of the present invention contains acid mine wastewater and sulfate-reducing bacteria in a container, and the membrane assembly serves as a carrier for the attachment and growth of sulfate-reducing bacteria in the container, thereby providing a stable growth environment, which is conducive to the growth and enrichment of sulfate-reducing bacteria, so that the sulfate-reducing bacteria form a biofilm on the membrane assembly, and avoid the problem of sulfate-reducing bacteria and metal precipitates being mixed and difficult to separate. The gas supply device supplies a gaseous electron donor to the membrane assembly to avoid the problem that the acid mine wastewater is further acidified by the addition of liquid electron donors such as sodium lactate, ethanol, and formic acid, which leads to the problem of increased difficulty in resetting the acid mine wastewater to neutral. The gaseous electron donor is provided to the attached biofilm by the membrane filaments of the membrane assembly, so that the gaseous electron donor is transferred through the gas phase and the solid phase, and the mass transfer link is less, thereby having a higher mass transfer efficiency. Therefore, the acid mine wastewater treatment equipment of the embodiment of the present invention has strong biological activity of sulfate-reducing bacteria, high sulfate reduction efficiency, easy precipitation and collection of metal precipitates, low difficulty and cost in resetting to neutrality, and even no need to resetting to neutrality.

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

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

[0010] In some embodiments, the container is provided with a vent, and the membrane assembly is provided with a gas outlet;

[0011] The acid mine drainage treatment equipment further comprises a gas collecting device, wherein the gas collecting device is connected to the exhaust port and / or the gas outlet to collect the gas discharged from the exhaust port and / or the gas outlet.

[0012] In some embodiments, the reactor further comprises an aerator, wherein the aerator is disposed below the membrane assembly and connected to the gas collecting device to receive and aerate the gas provided by the gas collecting device.

[0013] In some embodiments, the container is provided with a water inlet pipe and a water outlet, the water inlet pipe is used to supply wastewater into the container, and the outlet of the water inlet pipe is flush with the bottom of the membrane assembly or lower than the membrane assembly;

[0014] The acid mine wastewater treatment equipment also includes an alkali adding device, which is connected to the water inlet pipe and is used to provide alkali solution to the water inlet pipe.

[0015] In some embodiments, the container includes a three-phase separator, a main body and a mud discharge bucket connected in sequence 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 mud discharge bucket is provided with a mud discharge port.

[0016] In some embodiments, the reactors are at least two connected in sequence, and the drain port of the previous reactor is connected to the water inlet pipe of the next reactor.

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

[0018] In some embodiments, the alkali adding device also includes a pH sensor and a control terminal. A corresponding pH sensor is provided in each of the containers. 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 of the valves to control the opening and closing of the valve provided on the same container as the pH sensor according to the pH value transmitted by the pH sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of an acid mine wastewater treatment device according to an embodiment of the present invention Figure 1 ;

[0020] Figure 2 Schematic diagram of an acid mine wastewater treatment device according to an embodiment of the present invention Figure 2 .

[0021] Reference numerals:

[0022] 1. Reactor; 11. Container; 111. Exhaust port; 112. Water inlet pipe; 113. Drain port; 114. Three-phase separator; 115. Main body; 116. Mud discharge bucket; 117. Mud discharge port; 12. Membrane assembly; 121. Air inlet; 122. Air outlet; 13. Aerator; 2. Air supply device; 3. Gas collecting device; 4. Alkali adding device; 41. Outlet end; 42. Valve. DETAILED DESCRIPTION

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

[0024] Reference below Figure 1 and Figure 2An acid mine drainage treatment plant according to an embodiment of the present invention is described.

[0025] like Figure 1 and Figure 2 As shown, the acid mine wastewater treatment equipment according to the embodiment of the present invention includes a reactor 1 and a gas supply device 2 .

[0026] The reactor 1 includes a container 11 and a membrane assembly 12 arranged in the container 11. The membrane assembly 12 is used to attach the biofilm. The membrane assembly 12 is provided with an air inlet 121. The air supply device 2 is connected to the air inlet 121 of the membrane assembly 12 for supplying a gaseous electron donor to the membrane assembly 12.

[0027] For example, Figure 1 As shown, the reactor 1 includes a container 11 and a membrane assembly 12. The container 11 is preferably but not limited to being vertically arranged. The membrane assembly 12 is arranged in the container 11. The membrane assembly 12 is preferably but not limited to being vertically arranged. The gas supply device 2 is at least partially located outside the reactor 1, and the gas supply device 2 is connected to the gas inlet 121 of the membrane assembly 12.

[0028] When the acid mine wastewater treatment equipment is used, the container 11 contains acid mine wastewater and sulfate-reducing bacteria. The sulfate-reducing bacteria adhere to the surface of the membrane module 12 and form a biofilm. The gas supply device 2 supplies a gaseous electron donor to the membrane module 12. The gaseous electron donor is provided by the membrane filaments of the membrane module 12 to the attached biofilm, so that the sulfate-reducing bacteria convert SO4 in the acid mine wastewater into 2- Restore to S 2- , S 2- It combines with various heavy metals in acid mine drainage to form metal sulfides and precipitates the metal sulfides.

[0029] The acid mine wastewater treatment equipment of the embodiment of the present invention contains acid mine wastewater and sulfate-reducing bacteria in a container, and the membrane component serves as a carrier for the attachment and growth of sulfate-reducing bacteria in the container, thereby providing a stable growth environment, which is conducive to the growth and enrichment of sulfate-reducing bacteria, so that the sulfate-reducing bacteria form a biofilm on the membrane component and avoid the problem of sulfate-reducing bacteria and metal precipitates being mixed and difficult to separate.

[0030] The gas supply device supplies gaseous electron donors to the membrane components to avoid the problem of further acidification of the acid mine drainage water due to the addition of liquid electron donors such as sodium lactate, ethanol, formic acid, etc., which makes it more difficult to return the acid mine drainage water to neutral state.

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

[0032] Therefore, in the acid mine wastewater treatment equipment of the embodiment of the present invention, the biological activity of sulfate-reducing bacteria is strong, the sulfate reduction efficiency is high, the metal precipitates are easy to precipitate and collect, the difficulty and cost of returning to neutrality are low, and there is no need to return to neutrality.

[0033] In some embodiments, the membrane assembly 12 includes at least one of a plate membrane, a roll membrane, and a tubular membrane made of hollow fiber membrane filaments resistant to acid and alkali, and 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 provided with a pressurized air pump, a gas flow meter and a regulating valve.

[0036] The gas source can store hydrogen, methane, or a mixture of hydrogen and methane. The hydrogen and / or methane are provided to the attached biofilm through the membrane filaments of the membrane assembly 12, so that the sulfate-reducing bacteria convert the SO4 in the acidic mine wastewater into 2- The hydrogen sulfide gas is reduced and generated. The hydrogen sulfide gas is mixed with the acid mine drainage water and combined with various heavy metals in the acid mine drainage water to form metal sulfides. The alkalinity generated at the same time can replace the addition of chemicals to adjust the pH of the wastewater, reducing the difficulty and cost of adjusting back to neutrality.

[0037] At the same time, since hydrogen and / or methane are provided by the membrane filaments of the membrane assembly 12, sulfate-reducing bacteria adhere to the surface of the membrane assembly 12 to form a biofilm, thereby having a higher hydrogen sulfide yield and alkalinity yield, and improving the generation efficiency of metal sulfides.

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

[0039] Specifically, the membrane thickness control device preferably includes but is not limited to a driver and a scraper. The driver is connected to the inner wall of the container 11 or to the frame of the membrane assembly 12. The scraper is connected to the driver and has a predetermined spacing from the surface of the membrane assembly 12. The driver drives the scraper to move along the surface of the membrane assembly 12 to peel off metal precipitates attached to the membrane assembly 12 and to peel off the portion of the biofilm that exceeds the predetermined spacing to maintain the thickness of the biofilm, thereby ensuring that the biofilm has high activity and sulfate reduction efficiency, and avoiding excessive thickness of the biofilm that increases 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, an exhaust port 111 is provided at the top of the container 11 , and the hydrogen sulfide gas generated in the container 11 flows upward and is discharged from the exhaust port 111 .

[0042] The membrane assembly 12 is provided with an air inlet 121 at the top and an air outlet 122 at the bottom. Hydrogen and / or methane enter the membrane assembly 12 through the air inlet 121, then flow downward along the hollow space of the membrane filaments, and are provided to the biofilm through the membrane filaments during the flow. The remaining hydrogen and / or methane that is not provided to the biofilm is discharged from the air outlet 122. The hydrogen and / or methane moves from top to bottom in the membrane filaments, allowing the biofilm to form a higher hydrogen sulfide yield and alkalinity yield.

[0043] The acid mine drainage treatment equipment further comprises a gas collecting device 3 , which is connected to the exhaust port 111 and / or the gas outlet 122 to collect the gas exhausted from the exhaust port 111 and / or the gas outlet 122 .

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

[0045] In some embodiments, the reactor 1 further comprises an aerator 13 , which is disposed below the membrane assembly 12 . The aerator 13 is connected to the gas collecting device 3 to receive the gas provided by the gas collecting device 3 and perform aeration.

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

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

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

[0049] It should be noted that the sulfate-reducing bacteria can be introduced into the container 11 manually or by an introduction device before the acid mine wastewater treatment equipment is put into operation, or can be supplied into the container 11 together with the wastewater through the water inlet pipe 112 .

[0050] The acid mine wastewater treatment equipment further comprises an alkali adding device 4 , which is connected to the water inlet pipe 112 and is used to provide alkali solution to the water inlet pipe 112 .

[0051] like Figure 1 As shown, the alkali adding 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 and reaching the starting pH value of metal sulfide precipitation to promote the precipitation of metal sulfide at the bottom of the container 11.

[0052] The aerator 13 also plays a role in stirring the alkali solution to enhance the mixing effect of the alkali solution.

[0053] In some embodiments, the container 11 includes a three-phase separator 114, a main body 115 and a mud discharge bucket 116 connected in sequence 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 mud discharge bucket 116 is provided with a mud discharge port 117.

[0054] like Figure 1 As shown, the container 11 includes a three-phase separator 114 , a main body 115 and a mud discharge bucket 116 which are sequentially connected from top to bottom. In other words, the three-phase separator 114 is arranged at the top of the main body 115 , and the mud discharge bucket 116 is arranged at the bottom of the main body 115 .

[0055] The membrane assembly 12 and the aerator 13 are arranged in the main body 115, and the water inlet pipe 112 is arranged at the bottom of the main body 115 and passes through 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 mud bucket 116 to prevent water flow and air flow from disturbing the sediment in the mud bucket 116.

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

[0057] The acid mine drainage enters the main body 115 through the water inlet pipe 112, and then circulates along the vertical surface in the main body 115 under the action of the high-speed flow gas generated by the aerator 13. During the flow, the acid mine drainage fully contacts the biofilm attached to the membrane assembly 12, and is fully mixed with the hydrogen sulfide gas generated by the biofilm, thereby generating metal sulfides. The larger metal sulfides fall and settle in the mud discharge bucket 116, and the smaller metal sulfides, such as flocculent metal sulfides, flow upward with part of the acid mine drainage and enter the three-phase separator 114 through the mud discharge port. The three-phase separator 114 separates the hydrogen sulfide gas, the treated wastewater, and the metal sulfides. The hydrogen sulfide gas is discharged from the exhaust port 111, and the treated wastewater is discharged from the drain port 113. The separated smaller metal sulfides gather together to increase the volume, and then fall back into the main body 115 from the mud discharge port, and continue to fall and settle in the mud discharge bucket 116.

[0058] The metal precipitates and the portion of the biofilm that is peeled off from the membrane assembly 12 and exceeds the predetermined spacing also fall and settle in the mud discharge bucket 116 .

[0059] The mud bucket 116 is preferably a cone with a decreasing cross section from top to bottom, so that sediments can accumulate at the bottom of the mud bucket 116. The bottom of the mud bucket 116 is provided with a mud discharge port 117 that can be opened and closed, and the mud discharge port 117 is used to discharge the sediment in the mud bucket 116.

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

[0061] like Figure 2 As shown, there are at least two, preferably more than three, reactors 1 connected sequentially from left to right. Among adjacent reactors 1, the drain port 113 of the left reactor 1 is connected to the water inlet pipe 112 of the right reactor 1. In other words, along the direction of sequential connection, the drain port 113 of the upstream reactor 1 among adjacent reactors 1 is connected to the water inlet pipe 112 of the downstream reactor 1.

[0062] The water inlet pipe 112 of the most upstream reactor 1 is connected to the wastewater source. The acid mine wastewater provided by the wastewater source passes through at least two reactors 1 in sequence and is treated, and is finally discharged from the drain port 113 of the most downstream reactor 1 to have a stronger wastewater treatment effect.

[0063] There may be at least two gas supply devices 2 , gas collection devices 3 , and alkali adding devices 4 each arranged in one-to-one correspondence with the reactors 1 , or only one each may be arranged and connected to all the reactors 1 .

[0064] In some embodiments, the alkali adding device 4 includes an alkali solution source, an alkali adding pipe and a valve 42. The alkali adding pipe has an inlet end and at least two outlet ends 41. The alkali solution 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.

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

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

[0067] The amount of alkali solution supplied to the corresponding water inlet pipe 112 is controlled by controlling the opening and closing of the valve 42, thereby controlling the pH value in each container 11. Since the solubility product and the initial precipitation pH value of different metal ions are different, at least two containers 11 are controlled to have different pH values, so that metal sulfides of different metal ions are generated and precipitated in each container 11. The metal sulfides of different metal ions are collected and processed in a targeted manner, so as to recover different metals. For example, the pH value in at least two containers 11 increases along the direction of sequential connection.

[0068] It should be noted that, the opening and closing of the control valve 42 is controlled to control the amount of alkali solution supplied to the corresponding water inlet pipe 112. Each water inlet pipe 112 can be connected to an outlet port 41 respectively, and the amount of alkali solution supplied to the corresponding water inlet pipe 112 can be controlled by controlling the different opening time of the valve 42. Alternatively, the number of outlet ports 41 connected to the water inlet pipe 112 may be different, or the number of connections may be the same but all are connected to multiple outlet ports 41, the opening time of each valve 42 is the same, and the amount supplied to the corresponding water inlet pipe 112 is controlled by the number of outlet ports 41 connected to the water inlet pipe 112.

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

[0070] In some embodiments, the alkali adding device 4 also includes a pH sensor and a control terminal. A corresponding pH sensor is provided in each container 11. 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 provided on the same container 11 as the pH sensor according to the pH value transmitted by the pH sensor.

[0071] Specifically, the alkali adding device 4 also includes a pH sensor and a control terminal. Each container 11 is provided with a corresponding pH sensor. All pH sensors and all valves 42 are electrically connected to the control terminal. The pH sensor is used to detect the actual pH value in the corresponding container 11 and transmit the actual pH value to the control terminal. The control terminal has a preset pH value input manually 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 water 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. Therefore, the pH value of each container 11 can be automatically and real-time adjusted by the alkali adding device 4 to achieve graded precipitation and selective recovery of different metals.

[0072] In the description of the present invention, it is necessary to understand that the terms "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and 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 cannot be understood as a limitation on the present invention.

[0073] In addition, the terms "first" and "second" are only used for distinction, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0074] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0076] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An acid mine wastewater treatment equipment, characterized in that: include: A reactor (1) and a gas supply device (2), wherein the reactor (1) comprises a container (11) and a membrane assembly (12) arranged in the container (11), wherein the membrane assembly (12) is used for attaching a biofilm, and the membrane assembly (12) is provided with an air inlet (121), and the gas supply device (2) is connected to the air inlet (121) of the membrane assembly (12) and is used for supplying a gaseous electron donor to the membrane assembly (12).

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

3. The acid mine wastewater treatment equipment according to claim 1, characterized in that: The reactor (1) further comprises a membrane thickness control device, which is arranged in the container (11) and is movable along the surface of the membrane assembly (12).

4. The acid mine wastewater treatment equipment according to claim 1, characterized in that: The container (11) is provided with an exhaust port (111), and the membrane assembly (12) is provided with an exhaust port (122); The acid mine wastewater treatment equipment further comprises a gas collecting device (3), wherein the gas collecting device (3) is connected to the exhaust port (111) and / or the gas outlet (122) to collect the gas discharged from the exhaust port (111) and / or the gas outlet (122).

5. The acid mine drainage treatment equipment according to claim 4, characterized in that: The reactor (1) further comprises an aerator (13), wherein the aerator (13) is arranged below the membrane assembly (12), and the aerator (13) is connected to the gas collecting device (3) to receive the gas provided by the gas collecting device (3) and to perform aeration.

6. The acid mine drainage treatment equipment according to claim 5, characterized in that: The container (11) is provided with a water inlet pipe (112) and a water outlet (113); the water inlet pipe (112) is used to supply wastewater into the container (11); the outlet of the water inlet pipe (112) is flush with the bottom of the membrane assembly (12) or lower than the membrane assembly (12); The acid mine wastewater treatment equipment further comprises an alkali adding device (4), wherein the alkali adding device (4) is connected to the water inlet pipe (112) and is used to provide alkali solution to the water inlet pipe (112).

7. The acid mine drainage treatment equipment according to claim 6, characterized in that: The container (11) comprises a three-phase separator (114), a main body (115) and a mud discharge bucket (116) which are connected in sequence from top to bottom; the three-phase separator (114) is provided with the exhaust port (111) and the drain port (113); the main body (115) is provided with the water inlet pipe (112); and the mud discharge bucket (116) is provided with a mud discharge port (117).

8. The acid mine drainage treatment equipment according to claim 6, characterized in that: The reactors (1) are at least two connected in sequence, and the drainage port (113) of the previous reactor (1) is connected to the water inlet pipe (112) of the next reactor (1).

9. The acid mine drainage treatment equipment according to claim 8, characterized in that: The alkali adding device (4) comprises an alkali liquid source, an alkali adding pipe and a valve (42); the alkali adding pipe has an inlet end and at least two outlet ends (41); the alkali liquid source is connected to the inlet end; each of the water inlet pipes (112) is connected to a corresponding outlet end (41); each of the outlet ends (41) is provided with a corresponding valve (42) to control the opening and closing of the outlet end (41).

10. The acid mine drainage treatment equipment according to claim 9, characterized in that: The alkali adding device (4) further comprises a pH sensor and a control terminal. A corresponding pH sensor is arranged in each of the containers (11). The pH sensor is electrically connected to the control terminal so as to transmit the detected pH value to the control terminal. The control terminal is electrically connected to each of the valves (42) so as to control the opening and closing of the valve (42) arranged on the same container (11) as the pH sensor according to the pH value transmitted by the pH sensor.

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