Water treatment device and water treatment method using ozone tail gas

Abstract

The application discloses a water treatment device and a water treatment method using ozone tail gas, relates to the technical field of sewage treatment, and comprises an aeration tank, a membrane filtration tank, an ozone contact tank, a tail gas destruction device, a reduction protector and an ozone generator. The aeration tank, the membrane filtration tank, the ozone contact tank, the tail gas destruction device and the reduction protector are sequentially connected. The ozone generator is connected to the ozone contact tank. The aeration tank is provided with a blast aeration device and a MABR membrane aeration device. The reduction protector is connected to the MABR membrane aeration device. The water treatment device can make full use of the ozone-containing tail gas, avoid the damage of direct discharge of the tail gas to the ecological environment, improve the biochemical treatment efficiency of the aeration tank, save the aeration energy consumption, and improve the water quality of effluent.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a water treatment device and a water treatment method utilizing ozone exhaust gas. Background Technology

[0002] Ozone and the hydroxyl radicals it generates in water have redox potentials of 2.07V and 2.8V, respectively. In recent years, due to their advantages such as strong oxidizing power, fast reaction, ease of use, and no secondary chemical pollution, ozone has been increasingly widely used in the field of advanced wastewater treatment. However, ozone is toxic. An ozone concentration of 0.1 mg / m³ in the air can irritate the eyes, nose, throat, and respiratory tract, and an odor can be detected at concentrations of 0.01–0.02 mg / m³. Therefore, ozone exhaust gas generally needs to be decomposed by an ozone exhaust gas decomposer before being released into the atmosphere.

[0003] Currently, most research on ozone exhaust gas focuses on its decomposition to prevent secondary pollution. However, due to the low ozone generation efficiency of ozone generators, the oxygen content (tail oxygen) in the exhaust gas is still as high as 80% or more, making it essentially unusable and directly released into the atmosphere, resulting in a significant waste of energy. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a water treatment device that can make full use of ozone and oxygen in the exhaust gas, avoid the damage to the ecological environment caused by the direct discharge of the exhaust gas after destruction, improve the biochemical treatment efficiency of the aeration tank, reduce aeration energy consumption, and improve the quality of the effluent.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A water treatment device includes an aeration tank, a membrane filtration tank, an ozone contact tank, an exhaust gas destruction device, a reduction protector, and an ozone generator. The aeration tank, membrane filtration tank, ozone contact tank, exhaust gas destruction device, and reduction protector are connected in sequence. The ozone generator is connected to the ozone contact tank. The aeration tank is equipped with a blower aeration device and a MABR membrane aeration device. The reduction protector is connected to the MABR membrane aeration device.

[0006] In the above technical solution, the ozone in the exhaust gas is degraded into oxygen by the exhaust gas destruction device. The residual trace ozone is then removed by the reduction protector. After that, the oxygen is introduced into the MABR membrane aeration device in the aeration tank. This can not only replace part of the traditional blower aeration, thus reducing energy consumption, but also avoid the damage to the ecological environment caused by the direct emission of exhaust gas. At the same time, the use of pure oxygen aeration can significantly improve the biochemical treatment efficiency of the aeration tank and improve the quality of the effluent.

[0007] Preferably, an air storage tank is provided between the aeration tank and the reduction protector. The air inlet of the air storage tank is connected to the reduction protector, and the air outlet of the air storage tank is connected to the MABR membrane aeration device.

[0008] In the above technical solution, the gas storage tank can store the oxygen discharged by the reduction protector, and can slowly and evenly introduce oxygen into the MABR membrane aeration device according to the aeration needs to achieve a better aeration effect.

[0009] Preferably, the aeration tank is equipped with a flushing pipe, the outlet of the flushing pipe faces the MABR membrane aeration device, the inlet of the flushing pipe is connected to a clean water source, and the bottom of the aeration tank is equipped with a drain outlet.

[0010] In the above technical solution, the water source for the flushing pipeline can be connected from the outlet of the ozone contact tank or from an external clean water source. The bottom of the aeration tank is equipped with a drain outlet, which allows the water in the aeration tank to be drained when flushing the MABR membrane aeration device is required. Then, water is sprayed through the outlet of the flushing pipeline towards the MABR membrane aeration device for flushing, and the flushed wastewater is discharged from the drain outlet.

[0011] Preferably, the system also includes a disinfection and sterilization pipeline, one end of which is connected to the ozone generator and the other end of which is connected to the aeration disc at the bottom of the aeration tank. The disinfection and sterilization pipeline is connected and disconnected by a valve assembly.

[0012] When the influent water quality of a water treatment device is poor, a large number of filamentous bacteria will proliferate, affecting the water treatment effect of the device. In this case, the disinfection and sterilization pipeline in the above-mentioned technical solution can introduce ozone generated by the ozone generator into the aeration disc at the bottom of the aeration tank to disinfect and sterilize the sewage and equipment in the entire aeration tank, eliminating most of the filamentous bacteria in the aeration tank.

[0013] Preferably, the aeration tank includes a first aeration tank and a second aeration tank arranged side by side. Both the first and second aeration tanks are equipped with a blower aeration device and a MABR membrane aeration device. The inlet pipe of the aeration tank is equipped with an inlet control valve so that the inlet pipe of the aeration tank can be selectively connected to either the first or the second aeration tank, or the inlet pipe of the aeration tank can be simultaneously disconnected from both the first and the second aeration tanks. Both the first and the second aeration tanks are equipped with an outlet pipe, and the outlet pipe is equipped with an outlet control valve so that both the first and the second aeration tanks can be connected to the membrane filtration tank.

[0014] In the above technical solution, the first aeration tank and the second aeration tank are arranged side by side, allowing for alternating water treatment and achieving higher water treatment efficiency. Due to the inlet control valve, at any given time, the inlet pipe of the aeration tank can only be connected to one of the first or second aeration tanks.

[0015] Preferably, a third control valve is provided between the first aeration tank and the second aeration tank to control whether the two are connected, and the distance between the third control valve and the bottom of the first aeration tank is no more than 0.5m.

[0016] In the above technical solution, the third control valve can control whether the first aeration tank and the second aeration tank are connected, and can make the water between the first aeration tank and the second aeration tank interconnected as needed.

[0017] Preferably, the third control valve includes a valve body, a first valve core, a first spring, a second valve core, and a second spring. The valve body is provided with a first inlet channel, a first outlet channel, a first connecting cavity, a second inlet channel, a second outlet channel, and a second connecting cavity. The first inlet channel and the first outlet channel are staggered and connected through the first connecting cavity. The first valve core is slidably connected to the first connecting cavity. The first spring is connected between the first valve core and the valve body so that the first valve core abuts against and seals the first inlet channel. The second inlet channel and the second outlet channel are staggered and connected through the second connecting cavity. The second valve core is slidably connected to the second connecting cavity. The second spring is connected between the second valve core and the valve body so that the second valve core abuts against and seals the second inlet channel. The first inlet channel is connected to the first aeration tank, the first outlet channel is connected to the second aeration tank, the second inlet channel is connected to the second aeration tank, and the second outlet channel is connected to the first aeration tank.

[0018] In the above technical solution, when a pressure difference occurs between the liquids on both sides of the first and second aeration tanks near the third control valve, and the pressure difference reaches a set value, the first valve core or the second valve core will be opened, so that the liquid in the aeration tank on the side with greater pressure can automatically enter the other side.

[0019] Preferably, the first valve core has a first state of sealing the first water inlet channel, a second state of connecting the first water inlet channel and the first water outlet channel, and a third state of sealing the first water outlet channel; the second valve core has a first state of sealing the second water inlet channel, a second state of connecting the second water inlet channel and the second water outlet channel, and a third state of sealing the second water outlet channel; when the pressure difference between the liquid in the first aeration tank and the liquid in the second aeration tank is not greater than a first set value, both the first valve core and the second valve core are in the first state; when the liquid pressure in the first aeration tank is greater than the liquid pressure in the second aeration tank, and the pressure difference is greater than the first set value but not greater than the second set value. When the liquid pressure in the first aeration tank is greater than the liquid pressure in the second aeration tank, and the pressure difference is greater than a second set value, the first valve core is in a third state, and the second valve core is in a first state; when the liquid pressure in the second aeration tank is greater than the liquid pressure in the first aeration tank, and the pressure difference is greater than a first set value but not greater than a second set value, the second valve core is in a second state, and the first valve core is in a first state; when the liquid pressure in the second aeration tank is greater than the liquid pressure in the first aeration tank, and the pressure difference is greater than a second set value, the second valve core is in a third state, and the first valve core is in a first state.

[0020] In the above technical solution, the first set value is greater than the second set value. When the first aeration tank needs to be disinfected, one end of the disinfection pipeline is first connected to the ozone generator through the valve assembly to disinfect the water and various parts in the first aeration tank with ozone aeration. Continuous aeration is performed through a blower aeration device to eliminate residual ozone. After that, part of the disinfected water in the first aeration tank is extracted. As the liquid in the first aeration tank is extracted, the hydraulic pressure on the side of the third control valve near the first aeration tank decreases. At this time, the second valve core is opened by pressure, allowing the water in the second aeration tank to enter the first aeration tank, replacing the bacteria in the water with bacteria in the first aeration tank. Similarly, when the second aeration tank needs to be disinfected, the above method can also be used to replenish the bacteria in the second aeration tank. When a thorough cleaning of the first aeration tank is required, the drain outlet at the bottom of the first aeration tank can be opened to drain the water in the first aeration tank. When all the water in the first aeration tank is drained and the water in the second aeration tank is basically full, the pressure difference between the two is much greater than the second set value. The first aeration tank and the second aeration tank are not connected. Water is sprayed towards the MABR membrane aeration device through the outlet of the flushing pipe, and the flushed wastewater is discharged from the drain outlet.

[0021] Preferably, a temporary storage tank is provided on one side of the aeration tank. The temporary storage tank is connected to the first aeration tank and the second aeration tank through a pipeline and a first control valve. The temporary storage tank is connected to the inlet pipe through a water pump and a pipeline. The height of the temporary storage tank is lower than the height of the first aeration tank and the height of the second aeration tank.

[0022] In the above technical solution, after disinfection of the first or second aeration tank, a portion of the liquid in the first or second aeration tank can be discharged into a temporary storage tank, reducing the liquid level in the first or second aeration tank and thus lowering the hydraulic pressure on one side of the first or second aeration tank. The water in the temporary storage tank can be pumped into the second or first aeration tank for further treatment. The height of the temporary storage tank is lower than the heights of the first and second aeration tanks. Water from the first and second aeration tanks can automatically flow into the temporary storage tank after the first control valve is opened.

[0023] A method for treating water by utilizing ozone tail gas in water treatment, characterized by comprising the following process steps: S100, the influent flows into the aeration tank and is aerated by blowing air, and the retention time of the influent in the aeration tank is not less than 20 hours. S200, the effluent from the aeration tank undergoes mud-water separation via a membrane filtration tank; S300, the effluent from the membrane filtration tank enters the ozone contact tank, and ozone is added to the ozone contact tank through an ozone generator. The effective residence time of the influent in the ozone contact tank is not less than 0.8 hours. S400, the effluent from the ozone contact tank is discharged after meeting the standards. The ozone exhaust gas discharged from the ozone contact tank enters the exhaust gas destruction device, and the destroyed exhaust gas is introduced into the reduction protector. The S500 reduces the exhaust gas discharged from the protector and introduces it into the MABR membrane aeration device in the aeration tank to aerate the influent in the aeration tank.

[0024] In the above technical solution, ozone in the exhaust gas is degraded into oxygen, and the remaining trace ozone is removed by a reduction protector before being introduced into the MABR membrane aeration device in the aeration tank, replacing part of the traditional blower aeration. This has several advantages: first, it reduces energy consumption; second, it avoids the damage to the ecological environment caused by direct exhaust gas emissions; and third, the use of pure oxygen aeration significantly improves the biochemical treatment efficiency of the aeration tank, ensuring that the effluent water quality meets standards. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the aeration tank in this invention; Figure 3 This is a schematic diagram of the structure of the third control valve in this invention.

[0026] In the diagram: 1. Aeration tank; 101. First aeration tank 1; 102. Second aeration tank 1; 2. Membrane filtration tank; 3. Ozone contact tank; 4. Tail gas destruction device; 5. Reduction protector; 6. Ozone generator; 7. Gas storage tank; 8. Disinfection pipeline; 9. Third control valve; 901. Valve body; 902. First valve core; 903. First spring; 904. Second valve core; 905. Second spring; 906. First inlet channel; 907. First outlet channel; 908. First connecting cavity; 909. Second inlet channel; 910. Second outlet channel; 911. Second connecting cavity; 10. Temporary storage tank; 11. Blower. Detailed Implementation

[0027] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0028] Example 1: like Figure 1 and Figure 2 As shown, a water treatment device includes an aeration tank 1, a membrane filtration tank 2, an ozone contact tank 3, an exhaust gas destruction device 4, a reduction protector 5, and an ozone generator 6. The aeration tank 1, membrane filtration tank 2, ozone contact tank 3, exhaust gas destruction device 4, and reduction protector 5 are connected in sequence. The ozone generator 6 is connected to the ozone contact tank 3. The aeration tank 1 is equipped with a blower aeration device and a MABR membrane aeration device. The reduction protector 5 is connected to the MABR membrane aeration device.

[0029] In the above technical solution, the ozone in the exhaust gas is degraded into oxygen by the exhaust gas destruction device 4, and the residual trace ozone is removed by the reduction protector 5. Then the oxygen is introduced into the MABR membrane aeration device in the aeration tank 1. This can not only replace part of the traditional blower aeration, thus reducing energy consumption, but also avoid the damage to the ecological environment caused by the direct emission of exhaust gas. At the same time, the use of pure oxygen aeration can significantly improve the biochemical treatment efficiency of the aeration tank 1 and improve the effluent quality.

[0030] The ozone exhaust gas destruction device 4 described in this application is a device for decomposing residual ozone in ozone exhaust gas. Its working principle is to promote the decomposition reaction of ozone through catalysis, such as with metal oxides like manganese and cobalt, or to convert ozone into oxygen through other chemical reactions.

[0031] The reduction protector 5 described in this application contains a dilute ferrous sulfate solution or sodium sulfite solution, with a perforated plastic pipe at the bottom. The effective water depth does not exceed 2 meters, and the total effective water retention time is 1 hour. The exhaust gas after treatment by the ozone destroyer and reduction protector 5 is mainly composed of pure oxygen. When introduced into the aeration tank 1, it promotes the growth of aerobic bacteria, improves the efficiency of biological treatment, and ensures that the effluent water quality meets the standards.

[0032] The ozone generator 6 described in this application converts oxygen into ozone through ionization or electrolysis.

[0033] The blower aeration device described in this application has a foaming component that generates dense microbubbles, which can evenly distribute the gas blown in by the blower in the aeration tank 1. The blower aeration device and the MABR membrane aeration device are usually located at the bottom of the aeration tank 1. One end of the blower aeration device is connected to a blower 11 to blow air into the aeration device.

[0034] The membrane filtration tank 2 described in this application uses membrane filtration technology to filter the influent. The filtered effluent enters the ozone contact tank 3. The filtered sludge can be partially returned to the aeration tank 1, and the remaining sludge is collected and treated uniformly.

[0035] In the MABR (Membrane Aerated Biofilm Reactor) aeration device described in this application, due to the characteristics of the MABR membrane, the influence of water depth resistance on the aeration process is negligible, so there is no need to pressurize the air, significantly reducing energy consumption compared to traditional aeration processes. Constant low-pressure oxygen enters the membrane module through the gaps between the permeable membrane and the spacer layer, and then distributes the oxygen into the water. This structure achieves optimal oxygen mass transfer efficiency, with oxygen diffusing from one side of the membrane to the wastewater on the other side via a free diffusion mechanism. Simultaneous nitrification and denitrification can be achieved in the biofilm layer on the membrane surface, resulting in a much higher level of pollutant removal efficiency compared to traditional biofilm methods.

[0036] Preferably, an air storage tank 7 is provided between the aeration tank 1 and the reduction protector 5. The air inlet of the air storage tank 7 is connected to the reduction protector 5, and the air outlet of the air storage tank 7 is connected to the MABR membrane aeration device.

[0037] In the above technical solution, the gas storage tank 7 can store the oxygen discharged by the reduction protector 5, and can slowly and evenly introduce oxygen into the MABR membrane aeration device according to the aeration needs to achieve a better aeration effect.

[0038] Preferably, the aeration tank 1 is provided with a flushing pipe, the outlet of the flushing pipe faces the MABR membrane aeration device, the inlet of the flushing pipe is connected to a clean water source, and the bottom of the aeration tank 1 is provided with a drain outlet.

[0039] During water treatment, the surface of the MABR membrane aeration device needs to be rinsed regularly to prevent sludge buildup, which reduces oxygen transfer efficiency and water treatment effectiveness. In the above technical solution, the water source for the rinsing pipeline can be connected from the outlet of the ozone contact tank 3 or from an external clean water source. The bottom of the aeration tank 1 is equipped with a drain outlet, allowing the water in the aeration tank 1 to be drained when rinsing the MABR membrane aeration device is required. Water is then sprayed onto the MABR membrane aeration device through the outlet of the rinsing pipeline, and the rinsed wastewater is discharged from the drain outlet.

[0040] Preferably, it also includes a disinfection pipeline 8, one end of which is connected to the ozone generator 6, and the other end of which is connected to the aeration disc or blower aeration device (without passing through a blower) at the bottom of the aeration tank. The disinfection pipeline 8 is connected and disconnected by a valve assembly.

[0041] During water treatment, when the influent water quality of the water treatment device is poor, a large number of filamentous bacteria will proliferate, affecting the water treatment effect of the device and resulting in substandard final treatment. In this case, it is necessary to thoroughly sterilize the entire bacterial community in the aeration tank 1. After sterilization, the target bacterial community is reintroduced to regain its dominant position for water purification. The disinfection and sterilization pipeline 8 in the above technical solution can introduce ozone generated by the ozone generator 6 into the aeration disc at the bottom of the aeration tank 1 to disinfect and sterilize the water and equipment in the entire aeration tank 1, eliminating most of the filamentous bacteria.

[0042] Example 2: like Figures 1 to 3 As shown, based on Embodiment 1, the aeration tank 1 includes a first aeration tank 101 and a second aeration tank 102 arranged side by side. Both the first aeration tank 101 and the second aeration tank 102 are equipped with a blower aeration device and a MABR membrane aeration device. The inlet pipe of the aeration tank 1 is equipped with an inlet control valve so that the inlet pipe of the aeration tank 1 can be selectively connected to either the first aeration tank 101 or the second aeration tank 102, or the inlet pipe of the aeration tank 1 can be simultaneously disconnected from both the first aeration tank 101 and the second aeration tank 102. Both the first aeration tank 101 and the second aeration tank 102 are equipped with an outlet pipe, and the outlet pipe is equipped with an outlet control valve so that both the first aeration tank 101 and the second aeration tank 102 are connected to the membrane filtration tank 2.

[0043] In the above technical solution, the first aeration tank 101 and the second aeration tank 102 are arranged side by side, allowing for alternating water treatment and achieving higher water treatment efficiency. Due to the setting of the inlet control valve, at any given time, the inlet pipe of the aeration tank 1 can only be connected to one of the first aeration tank 101 or the second aeration tank 102.

[0044] Preferably, a third control valve 9 is provided between the first aeration tank 101 and the second aeration tank 102 to control whether the two are connected. The distance between the third control valve 9 and the bottom of the first aeration tank 101 is no more than 0.5m.

[0045] The third control valve 9 includes a valve body 901, a first valve core 902, a first spring 903, a second valve core 904, and a second spring 905. The valve body 901 is provided with a first water inlet channel 906, a first water outlet channel 907, a first connecting cavity 908, a second water inlet channel 909, a second water outlet channel 910, and a second connecting cavity 911. The first water inlet channel 906 and the first water outlet channel 907 are staggered and connected through the first connecting cavity 908. The first valve core 902 is slidably connected to the first connecting cavity 908. The first spring 903 is connected between the first valve core 902 and the valve body 901 so that the first valve core 902 abuts against and seals. The first water inlet channel 906; the second water inlet channel 909 and the second water outlet channel 910 are staggered and connected through the second connecting cavity 911; the second valve core 904 is slidably connected to the second connecting cavity 911; the second spring 905 is connected between the second valve core 904 and the valve body 901 so that the second valve core 904 abuts against and seals the second water inlet channel 909; the first water inlet channel 906 is connected to the first aeration tank 101; the first water outlet channel 907 is connected to the second aeration tank 102; the second water inlet channel 909 is connected to the second aeration tank 102; and the second water outlet channel 910 is connected to the first aeration tank 101.

[0046] In the above technical solution, the third control valve 9 can control whether the first aeration tank 101 and the second aeration tank 102 are connected, and can enable water exchange between the first aeration tank 101 and the second aeration tank 102 as needed. When a pressure difference occurs between the liquids on both sides of the third control valve 9 near the first aeration tank 101 and the second aeration tank 102, and the pressure difference reaches a set value, the first valve core 902 or the second valve core 904 will be opened, so that the liquid in the aeration tank 1 on the side with higher pressure can automatically enter the other side.

[0047] For example, when disinfection of the first aeration tank 101 is required, one end of the disinfection pipeline 8 is first connected to the ozone generator 6 via the valve assembly to disinfect the water and various components in the first aeration tank 101 with ozone aeration. Then, air is continuously blown in by the blower aeration device to eliminate residual ozone. After that, part of the disinfected water in the first aeration tank 101 is extracted. As the liquid in the first aeration tank 101 is extracted, the hydraulic pressure on the side of the third control valve 9 near the first aeration tank 101 decreases. At this time, the second valve core 904 is opened by pressure, allowing water from the second aeration tank 102 to enter the first aeration tank 101, replacing the bacteria in the water with those in the first aeration tank 101. During the entire disinfection process, the second aeration tank 102 can continue water treatment, preventing the entire water treatment device from shutting down. Furthermore, the water in the first aeration tank 101 does not need to be discharged in large quantities during the entire process, which can save time, and the untreated water in the first aeration tank 101 can continue to be treated after disinfection.

[0048] Similarly, when it is necessary to disinfect the second aeration tank 102, the above method can also be used to replenish the microbial community in the second aeration tank 102.

[0049] Preferably, the first valve core 902 has a first state of sealing the first water inlet channel 906, a second state of connecting the first water inlet channel 906 and the first water outlet channel 907, and a third state of sealing the first water outlet channel 907; the second valve core 904 has a first state of sealing the second water inlet channel 909, a second state of connecting the second water inlet channel 909 and the second water outlet channel 910, and a third state of sealing the second water outlet channel 910; when the pressure difference between the liquid in the first aeration tank 101 and the liquid in the second aeration tank 102 is not greater than a first set value, both the first valve core 902 and the second valve core 904 are in the first state; the liquid pressure in the first aeration tank 101 is greater than the liquid pressure in the second aeration tank 102, and the pressure difference is greater than the first set value but not greater than the second set value. When the set value is set, the first valve core 902 is in the second state, and the second valve core 904 is in the first state; when the liquid pressure in the first aeration tank 101 is greater than the liquid pressure in the second aeration tank 102, and the pressure difference is greater than the second set value, the first valve core 902 is in the third state, and the second valve core 904 is in the first state; when the liquid pressure in the second aeration tank 102 is greater than the liquid pressure in the first aeration tank 101, and the pressure difference is greater than the first set value but not greater than the second set value, the second valve core 904 is in the second state, and the first valve core 902 is in the first state; when the liquid pressure in the second aeration tank 102 is greater than the liquid pressure in the first aeration tank 101, and the pressure difference is greater than the second set value, the second valve core 904 is in the third state, and the first valve core 902 is in the first state.

[0050] In this embodiment, the liquid pressure in the first aeration tank 101 refers to the pressure at the location where the third control valve 9 is set in the first aeration tank 101, that is, the pressure of the first inlet channel 906 and the second outlet channel 910. The liquid pressure in the second aeration tank 102 refers to the pressure at the location where the third control valve 9 is set in the second aeration tank 102, that is, the pressure of the first outlet channel 907 and the second inlet channel 909.

[0051] In the above technical solution, the first set value is greater than the second set value. When the liquid pressure in the first aeration tank 101 is greater than the liquid pressure in the second aeration tank 102, and the pressure difference is greater than the first set value but not greater than the second set value, the first valve core 902, under pressure, overcomes the elastic force of the first spring 903 and moves away from the first water inlet channel 906, and approaches the first water outlet channel 907, so that the first water inlet channel 906 and the first water outlet channel 907 can be connected through the first connecting cavity 908; when the liquid pressure in the first aeration tank 101 is greater than the liquid pressure in the second aeration tank 102, and the pressure difference is greater than the second set value, the first valve core 902, under pressure, overcomes the elastic force of the first spring 903 and moves away from the first water inlet channel 906, and approaches the first water outlet channel 907, so that the first valve core 902 abuts against and seals the first water outlet channel 907. Similarly, when the liquid pressure in the second aeration tank 102 is greater than the liquid pressure in the first aeration tank 101, and the pressure difference is greater than the first set value but not greater than the second set value, the second valve core 904, under pressure, overcomes the elastic force of the second spring 905 and moves away from the second water inlet channel 909, and approaches the second water outlet channel 910, so that the second water inlet channel 909 and the second water outlet channel 910 can be connected through the second connecting cavity 911; when the liquid pressure in the second aeration tank 102 is greater than the liquid pressure in the first aeration tank 101, and the pressure difference is greater than the second set value, the second valve core 904, under pressure, overcomes the elastic force of the second spring 905 and moves away from the second water inlet channel 909, and approaches the second water outlet channel 910, so that the second valve core 904 abuts against and seals the second water outlet channel 910.

[0052] When disinfection of the first aeration tank 101 is required, one end of the disinfection pipeline 8 is first connected to the ozone generator 6 via the valve assembly to disinfect the water and various components in the first aeration tank 101 with ozone aeration. Air is continuously blown in by the blower aeration device to eliminate residual ozone. After this process, a portion of the disinfected water in the first aeration tank 101 is extracted. As the liquid in the first aeration tank 101 is extracted, the hydraulic pressure on the side of the third control valve 9 closest to the first aeration tank 101 decreases. At this time, the second valve core 904 is opened by pressure, allowing water from the second aeration tank 102 to enter the first aeration tank 101, replacing the bacteria in the water with those in the first aeration tank 101. Similarly, when disinfection of the second aeration tank 102 is required, the same method can be used to replenish the bacteria in the second aeration tank 102. During the entire disinfection process described above, the second aeration tank 102 can continue to treat water, thus preventing the entire water treatment device from shutting down.

[0053] When a thorough cleaning of the first aeration tank 101 is required, the drain outlet at the bottom of the first aeration tank 101 can be opened to drain the water from the first aeration tank 101. When all the water in the first aeration tank 101 is drained and the second aeration tank 102 is almost full, the pressure difference between the two is much greater than the second set value. The first aeration tank 101 and the second aeration tank 102 are not connected. Water is sprayed through the outlet of the flushing pipe towards the MABR membrane aeration device for flushing, and the flushed wastewater is discharged from the drain outlet. It is worth noting that when draining the first aeration tank 101 or the second aeration tank 102, the drainage flow rate is much greater than the flow rate of the third control valve 9.

[0054] When approximately 1 / 4 of the water in the first aeration tank 101 is discharged and the second aeration tank 102 is almost full, the pressure difference between the two is greater than the first set value. When the liquid height difference between the first aeration tank 101 and the second aeration tank 102 is less than 1 / 5, the pressure difference is less than the first set value. The above numerical settings are only a specific embodiment, and the first and second set values ​​can also be set according to actual needs.

[0055] Preferably, a temporary storage tank 10 is provided on one side of the aeration tank 1. The temporary storage tank 10 is connected to the first aeration tank 101 and the second aeration tank 102 via a pipeline and a first control valve. The temporary storage tank 10 is connected to the inlet pipe via a water pump and a pipeline. The height of the temporary storage tank 10 is lower than the height of the first aeration tank 101 and the second aeration tank 102.

[0056] In the above technical solution, after the first aeration tank 101 or the second aeration tank 102 is disinfected, a portion of the liquid in the first aeration tank 101 or the second aeration tank 102 can be discharged into the temporary storage tank 10, reducing the liquid level in the first aeration tank 101 or the second aeration tank 102, thereby lowering the hydraulic pressure on one side of the first aeration tank 101 or the second aeration tank 102. The water in the temporary storage tank 10 can be pumped into the second aeration tank 102 or the first aeration tank 101 for treatment. The height of the temporary storage tank 10 is lower than the height of the first aeration tank 101 and the second aeration tank 102. The water in the first aeration tank 101 and the second aeration tank 102 can automatically flow into the temporary storage tank 10 after the first control valve is opened.

[0057] Preferably, the end of the entire water treatment device has a detection buffer tank. When the effluent is found to be substandard, the water will be discharged into the detection buffer tank first, and the water will be retreated after the cause is determined.

[0058] Example 3: A method for treating water by utilizing ozone tail gas in water treatment, comprising the water treatment apparatus described in Example 1, and further comprising the following process steps: S100, the influent flows into the aeration tank 1 and is aerated by blowing air. The retention time of the influent in the aeration tank 1 is not less than 20 hours. S200, the effluent from aeration tank 1 undergoes mud-water separation via membrane filtration tank 2; S300, the effluent from the membrane filter tank 2 enters the ozone contact tank 3, and ozone is added to the ozone contact tank 3 through the ozone generator 6. The effective residence time of the influent in the ozone contact tank 3 is not less than 0.8 hours. S400, the effluent from the ozone contact tank 3 is discharged after meeting the standards. The ozone exhaust gas discharged from the ozone contact tank 3 enters the exhaust gas destruction device 4, and the destroyed exhaust gas is introduced into the reduction protector 5. The exhaust gas discharged from the S500 reduction protector 5 is introduced into the MABR membrane aeration device in the aeration tank 1 to aerate the influent in the aeration tank 1.

[0059] Preferably, the retention time of the influent in the aeration tank 1 is not less than 22.5 hours; the effective retention time of the influent in the ozone contact tank 3 is 1 hour.

[0060] In the above technical solution, ozone in the exhaust gas is degraded into oxygen, and the remaining trace ozone is removed by the reduction protector 5. Then, it is introduced into the MABR membrane aeration device in the aeration tank 1 to replace part of the traditional blower aeration. This has the advantages of reducing energy consumption, avoiding the damage to the ecological environment caused by direct exhaust gas emission, and significantly improving the biochemical treatment efficiency of the aeration tank 1 by using pure oxygen aeration, thus ensuring that the effluent water quality meets the standards.

Claims

1. A water treatment device, characterized in that, It includes an aeration tank, a membrane filtration tank, an ozone contact tank, an exhaust gas destruction device, a reduction protector, and an ozone generator. The aeration tank, membrane filtration tank, ozone contact tank, exhaust gas destruction device, and reduction protector are connected in sequence. The ozone generator is connected to the ozone contact tank. The aeration tank is equipped with a blower aeration device and a MABR membrane aeration device. The reduction protector is connected to the MABR membrane aeration device. It also includes a disinfection and sterilization pipeline, one end of which is connected to the ozone generator, and the other end of which is connected to the aeration disc at the bottom of the aeration tank. The disinfection and sterilization pipeline is controlled to connect and disconnect via a valve assembly. The aeration tank includes a first aeration tank and a second aeration tank arranged side by side. Both the first and second aeration tanks are equipped with a blower aeration device and a MABR membrane aeration device. The inlet pipe of the aeration tank is equipped with an inlet control valve so that the inlet pipe of the aeration tank can be selectively connected to either the first or the second aeration tank, or simultaneously disconnected from both the first and second aeration tanks. Both the first and second aeration tanks are equipped with an outlet pipe, and the outlet pipe is equipped with an outlet control valve so that both the first and second aeration tanks are connected to the membrane filtration tank. A third control valve is provided between the first aeration tank and the second aeration tank to control whether the two are connected. The distance between the third control valve and the bottom of the first aeration tank is no more than 0.5m. The third control valve includes a valve body, a first valve core, a first spring, a second valve core, and a second spring. The valve body is provided with a first inlet channel, a first outlet channel, a first connecting cavity, a second inlet channel, a second outlet channel, and a second connecting cavity. The first inlet channel and the first outlet channel are staggered and connected through the first connecting cavity. The first valve core is slidably connected to the first connecting cavity. The first spring is connected between the first valve core and the valve body so that the first valve core abuts against and seals the first inlet channel. The second inlet channel and the second outlet channel are staggered and connected through the second connecting cavity. The second valve core is slidably connected to the second connecting cavity. The second spring is connected between the second valve core and the valve body so that the second valve core abuts against and seals the second inlet channel. The first inlet channel is connected to the first aeration tank, the first outlet channel is connected to the second aeration tank, the second inlet channel is connected to the second aeration tank, and the second outlet channel is connected to the first aeration tank. The first valve core has a first state of sealing the first water inlet channel, a second state of connecting the first water inlet channel and the first water outlet channel, and a third state of sealing the first water outlet channel; the second valve core has a first state of sealing the second water inlet channel, a second state of connecting the second water inlet channel and the second water outlet channel, and a third state of sealing the second water outlet channel; when the difference between the liquid pressure in the first aeration tank and the liquid pressure in the second aeration tank is not greater than a first set value, both the first valve core and the second valve core are in the first state; When the liquid pressure in the first aeration tank is greater than the liquid pressure in the second aeration tank, and the pressure difference is greater than a first set value but not greater than a second set value, the first valve core is in the second state, and the second valve core is in the first state; when the liquid pressure in the first aeration tank is greater than the liquid pressure in the second aeration tank, and the pressure difference is greater than the second set value, the first valve core is in the third state, and the second valve core is in the first state; when the liquid pressure in the second aeration tank is greater than the liquid pressure in the first aeration tank, and the pressure difference is greater than a first set value but not greater than a second set value, the second valve core is in the second state, and the first valve core is in the first state; when the liquid pressure in the second aeration tank is greater than the liquid pressure in the first aeration tank, and the pressure difference is greater than the second set value, the second valve core is in the third state, and the first valve core is in the first state. When draining the first or second aeration tank, the drainage flow rate is greater than the flow rate of the third control valve.

2. The water treatment device according to claim 1, characterized in that, An air storage tank is provided between the aeration tank and the reduction protector. The air inlet of the air storage tank is connected to the reduction protector, and the air outlet of the air storage tank is connected to the MABR membrane aeration device.

3. The water treatment device according to claim 1, characterized in that, The aeration tank is equipped with a flushing pipe, the outlet of which faces the MABR membrane aeration device, the inlet of which is connected to a clean water source, and the bottom of the aeration tank is equipped with a drain outlet.

4. The water treatment device according to claim 1, characterized in that, A temporary storage tank is provided on one side of the aeration tank. The temporary storage tank is connected to the first aeration tank and the second aeration tank through a pipeline and a first control valve. The temporary storage tank is connected to the inlet pipe through a water pump and a pipeline. The height of the temporary storage tank is lower than the height of the first aeration tank and the height of the second aeration tank.

Images