Bacteria-algae symbiotic membrane aeration bio-membrane reactor and bio-membrane thickness control method

Abstract

The embodiment of the invention provides an algal-bacterial symbiotic membrane aeration bio-membrane reactor and a bio-membrane thickness control method.The algal-bacterial symbiotic membrane aeration bio-membrane reactor comprises a container, a membrane assembly, a carbon dioxide supply device, an oxygen supply device and a light source, the membrane assembly comprises a first membrane wire group and a second membrane wire group which are arranged at an interval, the carbon dioxide supply device is connected with an air inlet of the first membrane wire group so as to provide carbon dioxide for the first membrane wire group, the carbon dioxide is connected with an air inlet of the second membrane wire group so as to provide oxygen for the second membrane wire group, and the light source irradiates the first membrane wire group. The bacteria-algae symbiotic membrane aeration bio-membrane reactor disclosed by the embodiment of the invention has a relatively strong sewage treatment effect.

Description

Technical Field

[0001] The invention relates to the field of water treatment, and in particular to a bacteria-algae symbiotic membrane aeration biofilm reactor and a biofilm thickness control method. Background Art

[0002] In the related art, the biofilm reactor of algae symbiosis is equipped with a biological rope carrier inside, the biological rope carrier is attached to the algae biofilm, and the algae biofilm is illuminated. An aeration device is provided under the biological rope carrier to assist the algae in providing the fungi with oxygen required for growth, thereby treating the sewage through the algae biofilm. However, algae and fungi are attached to the biological rope carrier at the same time and there is competition in the same area. The oxygen provided by the aeration device will cause the concentration of dissolved oxygen in the reactor to increase, inhibiting the photosynthesis of algae, and will also cause carbon dioxide stripping and loss of inorganic carbon. Therefore, the sewage treatment effect of the biofilm reactor of algae symbiosis in the related art is poor. 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 a bacteria-algae symbiotic membrane aeration biofilm reactor.

[0005] The embodiment of the present invention also provides a method for controlling biofilm thickness.

[0006] The bacteria-algae symbiotic membrane aeration biofilm reactor of the embodiment of the present invention comprises:

[0007] container;

[0008] A membrane assembly, wherein the membrane assembly is disposed in the container, and the membrane assembly comprises a first membrane filament group and a second membrane filament group arranged at intervals;

[0009] a carbon dioxide supply device, the carbon dioxide supply device being connected to an air inlet of the first membrane filament group to provide carbon dioxide to the first membrane filament group;

[0010] an oxygen supply device, the oxygen supply device being connected to an air inlet of the second membrane filament group to provide oxygen to the second membrane filament group;

[0011] A light source is provided to illuminate the first membrane filament group.

[0012] In the aerated biofilm reactor of the bacteria-algae symbiotic membrane of the embodiment of the present invention, the first membrane filament group is used to release carbon dioxide and attach to the algae biofilm to avoid the algae from being suspended and discharged, and also provide a stable carbon source to the algae to cooperate with the light source to ensure the growth and reproduction of the algae. The second membrane filament group is used to release oxygen and attach to the fungus biofilm to improve the utilization rate of oxygen by the fungi. At the same time, since the second membrane filament group is spaced from the first membrane filament group, the supplied gas is directly supplied to the biofilm through the concentration gradient difference, and no excess gas overflow is generated, thereby avoiding competition between algae and fungi in the same area and avoiding dissolved oxygen stress on algae. At the same time, the first membrane filament group and the second membrane filament group adopt a bubble-free aeration method to avoid the occurrence of blow-off to ensure the normal growth and reproduction of algae biofilm and fungus biofilm. The growth balance of bacteria and algae will feed back the membrane assembly to assimilate phosphorus to the greatest extent, thereby improving the effect of nitrogen removal and phosphorus removal. Therefore, the aerated biofilm reactor of the bacteria-algae symbiotic membrane of the embodiment of the present invention has a strong sewage treatment effect.

[0013] In some embodiments, the first membrane filament group surrounds the outer periphery of the second membrane filament group and is arranged at intervals with the second membrane filament group, and the light source surrounds the outer periphery of the first membrane filament group and is disposed in the container.

[0014] In some embodiments, at least a portion of the container surrounding the outer periphery of the first membrane filament group is set to be transparent, and the light source surrounds the outer periphery of the transparent portion of the container.

[0015] In some embodiments, the light source is a light strip spirally wound around the outer circumference of the container.

[0016] In some embodiments, the gas outlet of the first membrane filament group and the gas outlet of the second membrane filament group extend to the outside of the container.

[0017] In some embodiments, the bacteria-algae symbiotic membrane aeration biofilm reactor also includes a distributor and a water supply pipe. The distributor is arranged in the container and is located below the membrane assembly. The water supply pipe is connected to the distributor and is used to supply the sewage to be treated into the container through the distributor.

[0018] In some embodiments, the bacteria-algae symbiotic membrane aeration biofilm reactor also includes a drain pipe and a return pipe, the drain pipe is connected to the container, and is used to discharge the treated sewage, the return pipe is connected between the drain pipe and the water supply pipe, or the return pipe is connected between the drain pipe and the distributor, and is used to supply at least part of the treated sewage discharged from the drain pipe into the container through the distributor.

[0019] In some embodiments, the bacteria-algae symbiotic membrane aerated biofilm reactor further includes a flushing gas source, which is connected to the distributor and is used to supply flushing gas into the container through the distributor.

[0020] In some embodiments, the bacteria-algae symbiotic membrane aerated biofilm reactor also includes a first sensor device, a second sensor device and a control terminal, the first sensor device is used to obtain the thickness of the biofilm attached to the first membrane filament group, the second sensor device is used to obtain the thickness of the biofilm attached to the second membrane filament group, the first sensor device, the carbon dioxide supply device, the second sensor device, and the oxygen supply device are all electrically connected to the control terminal, and the control terminal is used to control the gas supply of the carbon dioxide supply device according to the data transmitted by the first sensor device, and is used to control the gas supply of the oxygen supply device according to the data transmitted by the second sensor device.

[0021] In the biofilm thickness control method of the embodiment of the present invention, the biofilm is a biofilm attached to the membrane assembly of the bacteria-algae symbiotic membrane aeration biofilm reactor according to any of the above embodiments, and the biofilm thickness control method includes:

[0022] Running the bacteria-algae symbiotic membrane aerated biofilm reactor multiple times, and obtaining multiple data samples during each operation when the chemical oxygen demand, the ammonia nitrogen removal rate, and the total phosphorus removal rate are all greater than or equal to 80%, the data samples including the carbon dioxide supply, the oxygen supply, the thickness of the biofilm attached to the first membrane filament group, and the thickness of the biofilm attached to the second membrane filament group;

[0023] Obtaining the minimum and maximum values ​​of the carbon dioxide supply in all the data samples, thereby obtaining a range of the carbon dioxide supply;

[0024] Obtaining the minimum and maximum values ​​of the oxygen supply in all the data samples, thereby obtaining a range of the oxygen supply;

[0025] Obtaining the ratio of the carbon dioxide supply amount / oxygen supply amount in the same data sample, obtaining the minimum ratio of the carbon dioxide supply amount / oxygen supply amount and the maximum ratio of the carbon dioxide supply amount / oxygen supply amount in all the data samples, thereby obtaining the range of the ratio of the carbon dioxide supply amount / oxygen supply amount;

[0026] Obtain multiple thicknesses of biofilms attached to the first membrane filament group and multiple thicknesses of biofilms attached to the second membrane filament group from all the data samples that satisfy the range of the carbon dioxide supply, the range of the oxygen supply, and the range of the ratio of the carbon dioxide supply / oxygen supply, obtain the minimum and maximum values ​​among the thicknesses of the multiple biofilms attached to the first membrane filament group, thereby obtaining the thickness range of the biofilms attached to the first membrane filament group, and obtain the minimum and maximum values ​​among the thicknesses of the multiple biofilms attached to the second membrane filament group, thereby obtaining the thickness range of the biofilms attached to the second membrane filament group.

[0027] The biofilm thickness control method of the embodiment of the present invention runs the bacteria-algae symbiotic membrane aerated biofilm reactor multiple times and obtains multiple data samples when the chemical oxygen demand, ammonia nitrogen removal rate and total phosphorus removal rate are all greater than or equal to 80%, and obtains the range of carbon dioxide supply, the range of oxygen supply, and the range of the ratio of carbon dioxide supply / oxygen supply through all data samples, and screens the thickness of the biofilm attached to the first membrane filament group and the thickness of the biofilm attached to the second membrane filament group in all data samples according to the above range, thereby obtaining the thickness range of the biofilm attached to the first membrane filament group and the thickness range of the biofilm attached to the second membrane filament group. When the bacteria-algae symbiotic membrane aerated biofilm reactor treats sewage, maintaining the biofilm attached to the first membrane filament group and the biofilm attached to the second membrane filament group within the corresponding thickness range can ensure that the bacteria-algae symbiotic membrane aerated biofilm reactor has an excellent sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of a bacteria-algae symbiotic membrane aeration biofilm reactor according to an embodiment of the invention.

[0029] Reference numerals:

[0030] 1. Container; 11. Mud discharge bucket; 2. Membrane assembly; 21. First membrane wire group; 22. Second membrane wire group; 3. Carbon dioxide supply device; 4. Oxygen supply device; 5. Light source; 6. Distributor; 7. Water supply pipe; 8. Drain pipe; 9. Reflux pipe; 10. Flushing gas source; 20. Control terminal. DETAILED DESCRIPTION

[0031] 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.

[0032] Reference below Figure 1 The present invention describes a bacteria-algae symbiotic membrane aeration biofilm reactor and a biofilm thickness control method according to an embodiment of the present invention.

[0033] like Figure 1 As shown, the bacteria-algae symbiotic membrane aeration biofilm reactor of the embodiment of the present invention includes a container 1, a membrane assembly 2, a carbon dioxide supply device 3, an oxygen supply device 4 and a light source 5.

[0034] The membrane assembly 2 is disposed in the container 1, and the membrane assembly 2 includes a first membrane wire group 21 and a second membrane wire group 22 arranged at intervals. Figure 1As shown, the container 1 is preferably but not limited to a vertically arranged tank body for containing sewage and algae and bacteria for treating sewage. A membrane assembly 2 is arranged in the container 1. The membrane assembly 2 includes preferably but not limited to a first membrane fiber group 21 and a second membrane fiber group 22 which are arranged at intervals in a horizontal plane.

[0035] The carbon dioxide supply device 3 is connected to the air inlet of the first membrane wire group 21 to provide carbon dioxide to the first membrane wire group 21. Figure 1 As shown, the carbon dioxide supply device 3 is preferably but not limited to a storage tank for storing carbon dioxide. The carbon dioxide supply device 3 is connected to the air inlet of the first membrane filament group 21 through a pipeline to provide carbon dioxide to the first membrane filament group 21. The carbon dioxide is released by the membrane filaments of the first membrane filament group 21, so that algae are attached to the surface of the first membrane filament group 21 and an algae biofilm is formed.

[0036] The oxygen supply device 4 is connected to the air inlet of the second membrane wire group 22 to provide oxygen to the second membrane wire group 22. Figure 1 As shown, the oxygen supply device 4 is preferably but not limited to a storage tank for storing oxygen. The oxygen supply device 4 is connected to the air inlet of the second membrane filament group 22 through a pipeline to provide oxygen to the second membrane filament group 22. The oxygen is released by the membrane filaments of the second membrane filament group 22, so that bacteria are attached to the surface of the second membrane filament group 22 and a fungal biofilm is formed.

[0037] The light source 5 illuminates the first film wire group 21. For example, Figure 1 As shown, the light source 5 provides illumination to the first membrane filament group 21 to enable algae to grow and reproduce on the surface of the first membrane filament group 21 .

[0038] In the aerated biofilm reactor of the bacteria-algae symbiotic membrane of the embodiment of the present invention, the first membrane filament group is used to release carbon dioxide and attach to the algae biofilm to avoid the algae from being suspended and discharged, and also provide a stable carbon source to the algae to cooperate with the light source to ensure the growth and reproduction of the algae. The second membrane filament group is used to release oxygen and attach to the fungus biofilm to improve the utilization rate of oxygen by the fungi. At the same time, since the second membrane filament group is spaced from the first membrane filament group, the supplied gas is directly supplied to the biofilm through the concentration gradient difference, and no excess gas overflow is generated, thereby avoiding competition between algae and fungi in the same area and avoiding dissolved oxygen stress on algae. At the same time, the first membrane filament group and the second membrane filament group adopt a bubble-free aeration method to avoid the occurrence of blow-off and ensure the normal growth and reproduction of algae biofilm and fungus biofilm. The growth balance of bacteria and algae will feed back the membrane assembly to assimilate phosphorus to the greatest extent, thereby improving the effect of nitrogen removal and phosphorus removal. Therefore, the aerated biofilm reactor of the bacteria-algae symbiotic membrane of the embodiment of the present invention has a strong sewage treatment effect.

[0039] In some embodiments, the first membrane wire group 21 surrounds the outer periphery of the second membrane wire group 22 and is arranged at intervals with the second membrane wire group 22 . The light source 5 surrounds the outer periphery of the first membrane wire group 21 and is disposed in the container 1 .

[0040] like Figure 1 As shown, the first membrane wire group 21 and the second membrane wire group 22 are both ring-shaped in the vertical direction. The first membrane wire group 21 surrounds the outer periphery of the second membrane wire group 22 and is arranged at intervals with the second membrane wire group 22. The light source 5 is provided in the container 1 and surrounds the outer periphery of the first membrane wire group 21 to illuminate the first membrane wire group 21.

[0041] Therefore, the internal space of the container 1 is fully utilized, and the first membrane wire group 21 and the second membrane wire group 22 are ensured to be spaced apart, while the light source 5 fully illuminates the first membrane wire group 21 .

[0042] It is understandable that the first film wire group 21, the second film wire group 22 and the light source 5 are not limited to the following: Figure 1 As shown in the arrangement, in other embodiments, the first film wire group 21, the second film wire group 22 and the light source 5 are arranged in sequence in a horizontal direction, for example, in a left-right direction.

[0043] In some embodiments, at least a portion of the container 1 surrounding the outer periphery of the first membrane filament group 21 is set to be transparent, and the light source 5 surrounds the outer periphery of the transparent portion of the container 1 .

[0044] like Figure 1 As shown, the circumferential walls of the container 1 in the vertical direction are all set to be transparent, and the light source 5 surrounds the outer periphery of the circumferential wall of the container 1 to illuminate the first membrane wire group 21 through the circumferential wall of the container 1.

[0045] It is understandable that the circumferential wall of the container 1 is not limited to being set to be completely transparent. In other embodiments, the circumferential wall of the container 1 can be set to an inner and outer layer, the inner layer is set to be transparent, and the light source 5 is set between the inner and outer layers and around the inner layer.

[0046] It can be understood that the container 1 is not limited to being configured to be at least partially transparent. In other embodiments, the light source 5 is disposed inside the container 1 .

[0047] In some embodiments, the light source 5 is a light strip spirally wound around the outer circumference of the container 1 .

[0048] like Figure 1 As shown, the light source 5 is a light strip, which is arranged on the outer circumference of the container 1 and extends in a spiral shape along the vertical direction to facilitate the installation of the light source 5.

[0049] It can be understood that the light source 5 is not limited to being a light strip. In other embodiments, the light source 5 includes a plurality of light tubes extending vertically and arranged at intervals around the vertical direction.

[0050] In some embodiments, the gas outlet of the first membrane filament group 21 and the gas outlet of the second membrane filament group 22 extend to the outside of the container 1 .

[0051] like Figure 1 As shown, the first membrane wire group 21 and the second membrane wire group 22 each include a diverter, a plurality of membrane wires and a confluence piece, the plurality of membrane wires extend vertically and are arranged at intervals around the vertical direction, the diverter is connected to the top of the plurality of membrane wires, the diverter has an interface extending to the outside of the container 1, the confluence piece is connected to the bottom of the plurality of membrane wires, the confluence piece has a discharge port extending to the outside of the container 1.

[0052] In the first membrane wire group 21, the interface of the diverter forms the air inlet of the first membrane wire group 21, and is connected to the carbon dioxide supply device 3 through a pipeline. The discharge port of the confluence piece forms the air outlet of the first membrane wire group 21. The carbon dioxide provided by the carbon dioxide supply device 3 enters the diverter through the air inlet of the first membrane wire group 21, and is diverted by the diverter piece to the inner cavities of multiple membrane wires. The carbon dioxide flows from top to bottom along the membrane wire and is released into the container 1 through the wall of the membrane wire. The unreleased carbon dioxide enters the confluence piece and is discharged to the outside of the container 1 through the air outlet of the first membrane wire group 21 to avoid the discharge of carbon dioxide into the container 1 affecting the sewage treatment effect.

[0053] In the second membrane filament group 22, the interface of the diverter forms the air inlet of the second membrane filament group 22, and is connected to the oxygen supply device 4 through a pipeline. The discharge port of the confluence piece forms the air outlet of the second membrane filament group 22. The oxygen provided by the oxygen supply device 4 enters the diverter through the air inlet of the second membrane filament group 22, and is diverted by the diverter piece to the inner cavities of multiple membrane filaments. The oxygen flows from top to bottom along the membrane filaments and is released into the container 1 through the walls of the membrane filaments. The unreleased oxygen enters the confluence piece and is discharged to the outside of the container 1 through the air outlet of the second membrane filament group 22 to avoid the discharge of oxygen into the container 1 affecting the sewage treatment effect.

[0054] Furthermore, the gas outlet of the first membrane fiber group 21 can be connected to the carbon dioxide supply device 3 through a pipeline, and the gas outlet of the second membrane fiber group 22 can be connected to the oxygen supply device 4 through a pipeline, so as to reuse the discharged carbon dioxide and oxygen.

[0055] In some embodiments, the bacteria-algae symbiotic membrane aeration biofilm reactor of the embodiments of the present invention also includes a distributor 6 and a water supply pipe 7. The distributor 6 is arranged in the container 1 and is located below the membrane assembly 2. The water supply pipe 7 is connected to the distributor 6 and is used to supply the sewage to be treated into the container 1 through the distributor 6.

[0056] like Figure 1As shown, a distributor 6 is provided in the container 1, and the distributor 6 is located below the membrane assembly 2. The water supply pipe 7 preferably but not limited to passes through the container 1 and is connected to the distributor 6. The water supply pipe 7 supplies the sewage to be treated to the distributor 6, which is then discharged upward into the container 1 by the distributor 6, and an upward water flow is formed in the container 1, so that the sewage to be treated is fully in contact with the fungal biofilm and the algae biofilm, thereby improving the mass transfer effect and the sewage treatment effect.

[0057] In some embodiments, the bacteria-algae symbiotic membrane aeration biofilm reactor of the embodiments of the present invention also includes a drain pipe 8 and a return pipe 9. The drain pipe 8 is connected to the container 1 for discharging the treated sewage. The return pipe 9 is connected between the drain pipe 8 and the water supply pipe 7, or the return pipe 9 is connected between the drain pipe 8 and the distributor 6 for supplying at least part of the treated sewage discharged from the drain pipe 8 into the container 1 via the distributor 6.

[0058] like Figure 1 As shown, the top of the container 1 is connected to a drain pipe 8 to discharge the treated sewage.

[0059] The return pipe 9 is preferably, but not limited to, connected between the drain pipe 8 and the water supply pipe 7. A portion of the discharged treated sewage is discharged from the drain pipe 8 or supplied to the next process, and the other portion is returned to the water supply pipe 7 through the return pipe 9 and supplied to the container 1 through the distributor 6 together with the sewage to be treated in the water supply pipe 7. Since the discharged treated sewage contains bacterial and algae suspension, part of the bacterial and algae suspension can be returned to the container 1, thereby improving the sewage treatment effect. Preferably, the return pipe 9 has a regulating valve.

[0060] It should be noted that during the use of the bacteria-algae symbiotic membrane aeration biofilm reactor, when the pollution effect of sewage is more serious or the bacteria and algae have not grown to meet the sewage treatment requirements, all the treated sewage discharged can be returned through the reflux pipe 9.

[0061] In some embodiments, the return pipe 9 can also be connected between the drain pipe 8 and the distributor 6, and the untreated sewage provided by the water supply pipe 7 and the treated sewage returned by the return pipe 9 are mixed in the distributor 6 and discharged into the container 1.

[0062] In some embodiments, the bacteria-algae symbiotic membrane aerated biofilm reactor of the embodiments of the present invention further includes a flushing gas source 10 , which is connected to the distributor 6 and is used to supply flushing gas into the container 1 through the distributor 6 .

[0063] like Figure 1As shown, the flushing gas source 10 is preferably but not limited to a storage tank for storing flushing gas. The flushing gas source 10 is connected to the distributor 6 through a pipeline to supply the flushing gas to the distributor 6. The flushing gas is released into the container 1 together with the sewage in the form of bubbles by the distributor 6 to form an upward airflow, which is used to flush the fungal biofilm and the algae biofilm, so as to peel off the aging and loose parts of the biofilm and settle them to the bottom of the container 1, thereby ensuring the activity of the fungal biofilm and the algae biofilm and the treatment effect on the sewage.

[0064] Preferably, the flushing gas source 10 , the distributor 6 and the water supply pipe 7 are connected via a three-way valve to control the connection and disconnection between the flushing gas source 10 and the distributor 6 , and to control the connection and disconnection between the distributor 6 and the water supply pipe 7 .

[0065] Furthermore, the bottom of the container 1 is provided with a sludge discharge hopper 11, which is preferably, but not limited to, a conical shape with a cross section decreasing from top to bottom, and is used to collect and settle the sludge in the sewage and the aged loose parts of the peeled biofilm. The sludge discharge hopper 11 is located below the distributor 6 to avoid the fluctuation of water flow and air flow, so as to facilitate the sedimentation of the sludge and the aged loose parts of the biofilm. A discharge port is provided at the bottom of the sludge discharge hopper 11 for discharging the settled sludge and the aged loose parts of the biofilm.

[0066] In some embodiments, the bacteria-algae symbiotic membrane aerated biofilm reactor of the embodiment of the present invention also includes a first sensor device, a second sensor device and a control terminal 20. The first sensor device is used to obtain the thickness of the biofilm attached to the first membrane filament group 21, and the second sensor device is used to obtain the thickness of the biofilm attached to the second membrane filament group 22. The first sensor device, the carbon dioxide supply device 3, the second sensor device, and the oxygen supply device 4 are all electrically connected to the control terminal 20. The control terminal 20 is used to control the gas supply of the carbon dioxide supply device 3 according to the data transmitted by the first sensor device, and to control the gas supply of the oxygen supply device 4 according to the data transmitted by the second sensor device.

[0067] like Figure 1 As shown, a first sensor device and a second sensor device are provided in the container 1. The first sensor device is provided at the first membrane filament group 21 or is arranged opposite to the first membrane filament group 21 to obtain the thickness of the biofilm attached to the first membrane filament group 21, in other words, to obtain the thickness of the algae biofilm. The second sensor device is provided at the second membrane filament group 22 or is arranged opposite to the second membrane filament group 22 to obtain the thickness of the biofilm attached to the second membrane filament group 22, in other words, to obtain the thickness of the fungus biofilm. The first sensor device and the second sensor device can be optical sensors, electrical sensors, ultrasonic sensors, probes, etc.

[0068] The first sensor device is electrically connected to the control terminal 20 to transmit the acquired actual thickness of the algae biofilm to the control terminal 20 , and the second sensor device is electrically connected to the control terminal 20 to transmit the acquired actual thickness of the fungus biofilm to the control terminal 20 .

[0069] The carbon dioxide supply device 3 has a carbon dioxide valve for controlling its opening and closing and / or the carbon dioxide supply flow rate.

[0070] The oxygen supply device 4 has an oxygen valve for controlling its opening and closing and / or the oxygen supply flow rate.

[0071] The carbon dioxide valve and the oxygen valve are both electrically connected to the control terminal 20, and the control terminal 20 is used to control the opening and / or opening and closing of the carbon dioxide valve and the oxygen valve to control whether carbon dioxide and oxygen are supplied and / or the supply amount.

[0072] The control terminal 20 has an artificially preset thickness range of the algae biofilm and a thickness range of the fungus biofilm.

[0073] When the actual thickness of the algae biofilm transmitted by the first sensor device is lower than the preset thickness range of the algae biofilm, the control terminal 20 controls the carbon dioxide valve to open or increase the opening of the carbon dioxide valve to promote the growth and reproduction of algae, thereby increasing the thickness of the algae biofilm. When the actual thickness of the algae biofilm transmitted by the first sensor device is higher than the preset thickness range of the algae biofilm, the control terminal 20 controls the carbon dioxide valve to close or reduce the opening of the carbon dioxide valve to slow down the growth and reproduction of algae, thereby reducing the thickness of the algae biofilm, so that the actual thickness of the algae biofilm is roughly within the preset thickness range of the algae biofilm.

[0074] When the actual thickness of the fungal biofilm transmitted by the second sensor device is lower than the preset thickness range of the fungal biofilm, the control terminal 20 controls the oxygen valve to open or increase the opening of the oxygen valve to promote the growth and reproduction of fungi, thereby increasing the thickness of the fungal biofilm. When the actual thickness of the fungal biofilm transmitted by the second sensor device is higher than the preset thickness range of the fungal biofilm, the control terminal 20 controls the oxygen valve to close or reduce the opening of the oxygen valve to slow down the growth and reproduction of fungi, thereby reducing the thickness of the fungal biofilm, so that the actual thickness of the fungal biofilm is roughly within the preset thickness range of the fungal biofilm.

[0075] Reference below Figure 1 A biofilm thickness control method according to an embodiment of the present invention is described.

[0076] It should be noted that the biofilm in the biofilm thickness control method of the embodiment of the present invention is the biofilm attached to the membrane assembly 2 of the bacteria-algae symbiotic membrane aeration biofilm reactor according to the embodiment of the present invention, including the algae biofilm attached to the surface of the first membrane filament group 21 and the fungus biofilm attached to the surface of the second membrane filament group 22.

[0077] The biofilm thickness control method of the embodiment of the present invention includes the following steps.

[0078] The bacteria-algae symbiotic membrane aerated biofilm reactor is operated multiple times, and multiple data samples are obtained during each operation when the chemical oxygen demand, ammonia nitrogen removal rate, and total phosphorus removal rate are all greater than or equal to 80%. In other words, multiple data samples are obtained during each operation of the bacteria-algae symbiotic membrane aerated biofilm reactor, and the data samples are obtained when the chemical oxygen demand is greater than or equal to 80%, the ammonia nitrogen removal rate is greater than or equal to 80%, and the total phosphorus removal rate is greater than or equal to 80%. The data samples include the carbon dioxide supply, the oxygen supply, the thickness of the biofilm attached to the first membrane filament group 21, and the thickness of the biofilm attached to the second membrane filament group 22. It should be noted that the carbon dioxide supply, the oxygen supply, the thickness of the biofilm attached to the first membrane filament group 21, and the thickness of the biofilm attached to the second membrane filament group 22 in the same data sample are all values ​​at the same time.

[0079] The minimum and maximum values ​​of the carbon dioxide supply are obtained in all data samples, thereby obtaining the range of the carbon dioxide supply. In other words, the range of the carbon dioxide supply is greater than or equal to the minimum value of the carbon dioxide supply in all data samples, and less than or equal to the maximum value of the carbon dioxide supply in all data samples.

[0080] The minimum and maximum values ​​of the oxygen supply are obtained in all data samples, thereby obtaining the range of the oxygen supply. In other words, the range of the oxygen supply is greater than or equal to the minimum value of the oxygen supply in all data samples, and less than or equal to the maximum value of the oxygen supply in all data samples.

[0081] Obtain the ratio of the carbon dioxide supply / oxygen supply in the same data sample. In other words, divide the carbon dioxide supply in each data sample by the oxygen supply to obtain the ratio of the carbon dioxide supply / oxygen supply in each data sample. Obtain the minimum ratio of the carbon dioxide supply / oxygen supply and the maximum ratio of the carbon dioxide supply / oxygen supply in all data samples, thereby obtaining the ratio range of the carbon dioxide supply / oxygen supply. In other words, the ratio range of the carbon dioxide supply / oxygen supply is greater than or equal to the minimum ratio of the carbon dioxide supply / oxygen supply in all data samples, and less than or equal to the maximum ratio of the carbon dioxide supply / oxygen supply in all data samples.

[0082] The thickness of the biofilm attached to the plurality of first membrane filament groups 21 and the thickness of the biofilm attached to the plurality of second membrane filament groups 22 that meet the range of the carbon dioxide supply, the range of the oxygen supply, and the range of the ratio of the carbon dioxide supply / oxygen supply are obtained from all data samples. In other words, partial data whose carbon dioxide supply is within the range of the carbon dioxide supply, whose oxygen supply is outside the range of the oxygen supply, and whose ratio of the carbon dioxide supply / oxygen supply is within the range of the ratio of the carbon dioxide supply / oxygen supply is selected from all data samples, are obtained, and the thickness of the algae biofilm and the thickness of the fungus biofilm in the partial data are obtained.

[0083] The minimum and maximum values ​​are obtained from the thickness of the biofilms attached to the plurality of first membrane filament groups 21, thereby obtaining the thickness range of the biofilms attached to the first membrane filament group 21, and the minimum and maximum values ​​are obtained from the thickness of the biofilms attached to the plurality of second membrane filament groups 22, thereby obtaining the thickness range of the biofilms attached to the second membrane filament group 22. In other words, the minimum and maximum values ​​are selected from the thickness of the algae biofilm in the partial data, and the thickness range of the algae biofilm is greater than or equal to the minimum value of the algae biofilm thickness and less than or equal to the maximum value of the algae biofilm thickness, and the minimum and maximum values ​​are selected from the thickness of the fungus biofilm in the partial data, and the thickness range of the fungus biofilm is greater than or equal to the minimum value of the fungus biofilm thickness and less than or equal to the maximum value of the fungus biofilm thickness.

[0084] The obtained algae biofilm thickness range is preferably but not limited to the algae biofilm thickness range manually preset in the control terminal 20, and the obtained fungal biofilm thickness range is preferably but not limited to the fungal biofilm thickness range manually preset in the control terminal 20, so that the carbon dioxide supply and oxygen supply are controlled by the control terminal 20 when the bacteria-algae symbiotic membrane aeration biofilm reactor formally treats sewage, so that the actual thickness of the algae biofilm is roughly within the preset algae biofilm thickness range, and the actual thickness of the fungal biofilm is roughly within the preset fungal biofilm thickness range, thereby ensuring the activity of the fungal biofilm and the algae biofilm and the treatment effect on sewage.

[0085] The biofilm thickness control method of the embodiment of the present invention runs the bacteria-algae symbiotic membrane aerated biofilm reactor multiple times and obtains multiple data samples when the chemical oxygen demand, ammonia nitrogen removal rate and total phosphorus removal rate are all greater than or equal to 80%, and obtains the range of carbon dioxide supply, the range of oxygen supply, and the range of the ratio of carbon dioxide supply / oxygen supply through all data samples, and screens the thickness of the biofilm attached to the first membrane filament group and the thickness of the biofilm attached to the second membrane filament group in all data samples according to the above range, thereby obtaining the thickness range of the biofilm attached to the first membrane filament group and the thickness range of the biofilm attached to the second membrane filament group. When the bacteria-algae symbiotic membrane aerated biofilm reactor treats sewage, maintaining the biofilm attached to the first membrane filament group and the biofilm attached to the second membrane filament group within the corresponding thickness range can ensure that the bacteria-algae symbiotic membrane aerated biofilm reactor has an excellent sewage treatment effect.

[0086] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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. A bacteria-algae symbiotic membrane aeration biofilm reactor, characterized in that: include: Container (1); A membrane assembly (2), the membrane assembly (2) being arranged in the container (1), the membrane assembly (2) comprising a first membrane filament group (21) and a second membrane filament group (22) arranged at intervals; A carbon dioxide supply device (3), the carbon dioxide supply device (3) being connected to an air inlet of the first membrane filament group (21) so as to provide carbon dioxide to the first membrane filament group (21); An oxygen supply device (4), the oxygen supply device (4) being connected to an air inlet of the second membrane filament group (22) so as to supply oxygen to the second membrane filament group (22); A light source (5), the light source (5) irradiating the first membrane filament group (21).

2. The bacteria-algae symbiotic membrane aeration biofilm reactor according to claim 1, characterized in that: The first membrane filament group (21) surrounds the outer circumference of the second membrane filament group (22) and is arranged at intervals with the second membrane filament group (22); the light source (5) surrounds the outer circumference of the first membrane filament group (21) and is arranged in the container (1).

3. The bacteria-algae symbiotic membrane aeration biofilm reactor according to claim 2, characterized in that: At least the portion of the container (1) surrounding the outer periphery of the first membrane filament group (21) is configured to be transparent, and the light source (5) surrounds the outer periphery of the transparent portion of the container (1).

4. The bacteria-algae symbiotic membrane aeration biofilm reactor according to claim 3, characterized in that: The light source (5) is a light strip spirally wound around the outer circumference of the container (1).

5. The bacteria-algae symbiotic membrane aeration biofilm reactor according to claim 1, characterized in that: The gas outlet of the first membrane wire group (21) and the gas outlet of the second membrane wire group (22) extend to the outside of the container (1).

6. The bacteria-algae symbiotic membrane aeration biofilm reactor according to claim 1, characterized in that: It also includes a distributor (6) and a water supply pipe (7), wherein the distributor (6) is arranged in the container (1) and is located below the membrane assembly (2), and the water supply pipe (7) is connected to the distributor (6) and is used to supply the sewage to be treated into the container (1) through the distributor (6).

7. The bacteria-algae symbiotic membrane aeration biofilm reactor according to claim 6, characterized in that: It also comprises a drain pipe (8) and a return pipe (9), wherein the drain pipe (8) is connected to the container (1) and is used to discharge the treated sewage, and the return pipe (9) is connected between the drain pipe (8) and the water supply pipe (7), or the return pipe (9) is connected between the drain pipe (8) and the distributor (6) and is used to supply at least part of the treated sewage discharged from the drain pipe (8) into the container (1) via the distributor (6).

8. The bacteria-algae symbiotic membrane aeration biofilm reactor according to claim 6, characterized in that: It also comprises a flushing gas source (10), which is connected to the distributor (6) and is used to supply flushing gas into the container (1) through the distributor (6).

9. The bacteria-algae symbiotic membrane aeration biofilm reactor according to claim 1, characterized in that: It also includes a first sensor device, a second sensor device and a control terminal (20), wherein the first sensor device is used to obtain the thickness of the biofilm attached to the first membrane filament group (21), and the second sensor device is used to obtain the thickness of the biofilm attached to the second membrane filament group (22). The first sensor device, the carbon dioxide supply device (3), the second sensor device and the oxygen supply device (4) are all electrically connected to the control terminal (20), and the control terminal (20) is used to control the gas supply of the carbon dioxide supply device (3) according to the data transmitted by the first sensor device, and to control the gas supply of the oxygen supply device (4) according to the data transmitted by the second sensor device.

10. A method for controlling biofilm thickness, characterized in that: The biofilm is a biofilm attached to a membrane assembly (2) of a bacteria-algae symbiotic membrane aeration biofilm reactor according to any one of claims 1 to 9, and the biofilm thickness control method comprises: The bacteria-algae symbiotic membrane aerated biofilm reactor is operated multiple times, and during each operation, multiple data samples are obtained when the chemical oxygen demand, the ammonia nitrogen removal rate, and the total phosphorus removal rate are all greater than or equal to 80%, wherein the data samples include the carbon dioxide supply, the oxygen supply, the thickness of the biofilm attached to the first membrane filament group (21), and the thickness of the biofilm attached to the second membrane filament group (22); Obtaining the minimum and maximum values ​​of the carbon dioxide supply in all the data samples, thereby obtaining a range of the carbon dioxide supply; Obtaining the minimum and maximum values ​​of the oxygen supply in all the data samples, thereby obtaining a range of the oxygen supply; Obtaining the ratio of the carbon dioxide supply amount / oxygen supply amount in the same data sample, obtaining the minimum ratio of the carbon dioxide supply amount / oxygen supply amount and the maximum ratio of the carbon dioxide supply amount / oxygen supply amount in all the data samples, thereby obtaining the range of the ratio of the carbon dioxide supply amount / oxygen supply amount; The thickness of multiple biofilms attached to the first membrane filament group (21) and the thickness of multiple biofilms attached to the second membrane filament group (22) that satisfy the range of the carbon dioxide supply, the range of the oxygen supply, and the range of the ratio of the carbon dioxide supply / oxygen supply are obtained from all the data samples. The minimum and maximum values ​​are obtained among the thicknesses of the biofilms attached to the first membrane filament group (21), thereby obtaining the thickness range of the biofilms attached to the first membrane filament group (21). The minimum and maximum values ​​are obtained among the thicknesses of the biofilms attached to the second membrane filament group (22), thereby obtaining the thickness range of the biofilms attached to the second membrane filament group (22).

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