Sewage treatment device and sewage treatment method

Abstract

The present application relates to sewage treatment technical field, disclose sewage treatment device and sewage treatment method, sewage treatment device includes container, diaphragm, light source and reflux pipe, the inside of container is accommodating cavity, diaphragm is arranged in the container, diaphragm separates accommodating cavity into first area and second area, diaphragm is suitable for small molecule and dissolved solid pass, light source is arranged at one side of second area, reflux pipe is connected with first area and second area, the present application adopts diaphragm and separates the container into two spaces, sludge can only react in first area, microalgae can only carry out photosynthesis in second area, after photosynthesis, microalgae is backflowed to first area by reflux pipe, can improve sludge activity, reduce sewage treatment aeration energy consumption, improve sewage treatment nitrogen and phosphorus removal effect, reduce CO2 emission in the process of sewage treatment, to realize the goal of coordinated efficiency of sewage treatment of pollution reduction and carbon reduction.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to wastewater treatment devices and methods. Background Technology

[0002] With the continuous improvement of people's living standards, the amount of domestic sewage generated is increasing rapidly, and the pollutants carried by domestic sewage have brought enormous environmental pressure. The problem of domestic sewage treatment has received widespread attention. Currently, most domestic sewage treatment plants use the activated sludge process, but this method suffers from high aeration energy consumption, difficulty in nitrogen and phosphorus removal, and high CO2 emissions. Since microalgae co-cultivation can utilize the organic secretions produced by microalgae to promote microbial growth, microalgae photosynthesis to provide the O2 needed for aerobic microorganisms, and microalgae growth and reproduction to fix CO2, domestic sewage treatment technology based on microalgae co-cultivation is considered the most promising technology for solving the above-mentioned sewage treatment problems and has attracted widespread attention.

[0003] In wastewater treatment technologies based on microalgae co-cultivation, light source supply is one of the most crucial process control aspects. Light source control provides the microalgae with the necessary illumination for photosynthesis. To improve wastewater treatment efficiency and reduce the footprint of wastewater treatment facilities, a high concentration of activated sludge is typically maintained in the system.

[0004] In existing wastewater treatment devices, a high concentration of activated sludge can hinder the propagation of light within the device due to absorption and scattering, thus affecting the photosynthesis of microalgae and resulting in poor wastewater treatment performance. Summary of the Invention

[0005] In view of this, the present invention provides a wastewater treatment device and a wastewater treatment method to solve the problem that high concentrations of sludge affect microalgae photosynthesis in the prior art.

[0006] In a first aspect, the present invention provides a wastewater treatment device, including a container, a diaphragm, a light source, and a return pipe. The interior of the container is a receiving cavity, and the diaphragm is disposed inside the container, dividing the receiving cavity into a first region and a second region. The diaphragm is suitable for the passage of small molecules and dissolved solids. The light source is disposed on one side of the second region, and the return pipe connects the first region and the second region.

[0007] Beneficial effects: This invention uses a diaphragm to divide the container into two spaces. Sludge can only react in the first space, and microalgae can only photosynthesize in the second space. After photosynthesis, the microalgae are returned to the first space through the return pipe, which can improve sludge activity, reduce aeration energy consumption in sewage treatment, improve nitrogen and phosphorus removal efficiency in sewage treatment, and reduce CO2 emissions in the sewage treatment process, thereby achieving the goal of coordinated efficiency improvement in sewage treatment by reducing pollution and carbon emissions.

[0008] In one alternative embodiment, the wastewater treatment apparatus further includes an aeration assembly disposed within the first area.

[0009] Beneficial effects: The aeration generated by the aeration component of this invention in the first area can forcibly dissolve oxygen in the air into the sewage, maintain a certain dissolved oxygen concentration in the sewage, and generate sufficient mixing and water circulation in the first area, which promotes full contact and mixing between activated sludge and sewage, prevents suspended solids from settling, and keeps the biological solids in the water in a suspended state, ensuring effective contact and reaction between microorganisms and organic matter.

[0010] In one alternative embodiment, the wastewater treatment apparatus further includes a first stirring assembly disposed within a first area.

[0011] Beneficial effects: The invention sets up a first stirring component in the first area, which can maintain the circulation rate of the water in the first area, keep the mixed liquid in the first area in a suspended state, ensure that the microorganisms and sludge are in full contact, and promote the biochemical reaction; setting up the first stirring component can also ensure that the sludge and sewage are fully mixed, improve the treatment efficiency, and reduce sludge deposition.

[0012] In one alternative embodiment, the wastewater treatment apparatus further includes a second stirring assembly disposed within a second area.

[0013] Beneficial effects: The invention provides a second stirring component in the second region, which enables the microalgae to be mixed evenly in the second region, thereby improving the reaction efficiency of microalgae photosynthesis.

[0014] In one optional embodiment, the wastewater treatment device further includes a return inlet and a return outlet. The return inlet is disposed on the container and located on one side of the first region, and the return outlet is disposed on the container and located on one side of the second region. A return pipe connects the return inlet and the return outlet.

[0015] Beneficial effects: The present invention uses a return pipe to connect the return inlet and the return outlet, which enables microalgae to undergo photosynthesis in the second area before being input into the first area to participate in sewage treatment. This avoids the high concentration of activated sludge in the first area from hindering the propagation of light in the sewage treatment device due to absorption and scattering, thereby improving the propagation and utilization efficiency of light in the sewage treatment device.

[0016] In one alternative embodiment, the wastewater treatment device further includes an inlet and an outlet. The inlet is disposed on the container and located on one side of the first area, and is adapted to input wastewater into the first area. The outlet is disposed on the container and located on one side of the second area, and is adapted to output treated water.

[0017] Beneficial effects: The present invention provides an outlet to discharge the treated supernatant for reuse or direct discharge, and an inlet to replenish the sewage in the first area, thereby achieving continuous water treatment.

[0018] In one alternative implementation, the inlet is located below the return inlet and the outlet is located above the return outlet.

[0019] Beneficial effects: By placing the inlet below the return inlet, the wastewater entering from the bottom up can disturb the water in the first area, improving the wastewater treatment effect. Placing the outlet above the return outlet can prevent the discharge of water containing microalgae in the second area, thus ensuring the quantity of microalgae in the return water.

[0020] In one alternative implementation, a reflux valve is provided on the reflux pipe.

[0021] Beneficial effects: The present invention has a reflux valve on the reflux pipe, which can realize the regulation of the reflux flow rate and improve the sewage treatment effect.

[0022] In one alternative implementation, the volume ratio of the first region to the second region is 1:1 to 3:1.

[0023] Secondly, the present invention also provides a wastewater treatment method applied to the aforementioned wastewater treatment apparatus, the wastewater treatment method comprising:

[0024] Wastewater and activated sludge are added to the first zone, and microalgae are added to the second zone;

[0025] After immediate handling, the aeration components, return valve, first stirring component, second stirring component, and light source were activated.

[0026] After the second time-out process, the aeration components, return valve, first stirring component, second stirring component, and light source are shut off.

[0027] After standing for three hours, some of the supernatant was discharged from the outlet.

[0028] Since the wastewater treatment method is applied to the wastewater treatment device of this invention, it has the same beneficial effects as the wastewater treatment device, which will not be described in detail here. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a wastewater treatment device according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic flowchart of a wastewater treatment method according to an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Container; 101. First zone; 102. Second zone; 103. Return water inlet; 104. Return water outlet; 105. Inlet; 106. Outlet; 2. Diaphragm; 3. Light source; 4. Aeration assembly; 5. First mixing assembly; 6. Second mixing assembly. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The following is combined Figure 1 and Figure 2 The following describes embodiments of the present invention.

[0036] According to an embodiment of the present invention, in one aspect, such as Figure 1 As shown, a wastewater treatment device is provided, including a container 1, a diaphragm 2, a light source 3, and a return pipe. The container 1 has an interior cavity. The diaphragm 2 is disposed inside the container 1 and divides the cavity into a first region 101 and a second region 102. The diaphragm 2 is suitable for the passage of small molecules and dissolved solids. The light source 3 is disposed on one side of the second region 102. The return pipe connects the first region 101 and the second region 102.

[0037] Specifically, in this embodiment, the container 1 is not specifically limited. For example, in this embodiment, the container 1 has a cubic structure, while in other embodiments, the container 1 may also adopt a cylindrical structure.

[0038] In this embodiment, the volume of container 1 is 1 / 2 to 2 times the scale of the sewage treatment.

[0039] In this embodiment, the diaphragm 2 is not specifically limited. For example, in this embodiment, the diaphragm 2 is a microfiltration membrane with a pore size of less than 0.3 μm. Microfiltration membranes allow small molecules and dissolved solids (inorganic salts) to pass through, but retain suspended solids and high molecular weight colloids. In this embodiment, placing the diaphragm 2 inside the container 1 makes the overall structure of the wastewater treatment device more compact and reduces space occupation. The microfiltration membrane is mounted on a frame, which is detachably installed inside the container 1. After treating wastewater for a certain period of time, the diaphragm 2 can be removed from the container 1 and replaced.

[0040] In this embodiment, the sludge concentration in the first region 101 is 1000 mg / L to 3000 mg / L, and the microalgae concentration in the second region 102 is 150 mg / L to 1000 mg / L.

[0041] In this embodiment, when treating wastewater, wastewater and activated sludge are first added to the first region 101, and microalgae are added to the second region 102. The activated sludge contains a variety of bacteria and fungi and other microorganisms. The microbial community in the activated sludge is used to adsorb, oxidize and decompose the organic matter in the wastewater, thereby achieving the purpose of purifying wastewater.

[0042] In this embodiment, after the wastewater is treated in the first zone 101 for a period of time, the light source 3 on one side of the second zone 102 is turned on. During photosynthesis in the second zone 102, the microalgae absorb carbon dioxide from the water, causing the pH value of the water to rise. Under alkaline conditions, some metal ions (such as calcium, magnesium, iron, etc.) will form hydroxide precipitates, thereby being removed from the wastewater. At the same time, the higher pH value is also conducive to the hydrolysis and decomposition of certain organic pollutants, improving the biodegradability of the wastewater. The oxygen produced by the photosynthesis of microalgae in the second zone 102 can be moved through the diaphragm 2 to the first zone 101 to participate in aerobic reactions, while the organic matter produced by photosynthesis is transported back to the first zone 101 through the return pipe along with the water in the second zone 102 to participate in water treatment again.

[0043] In this embodiment, the recirculation ratio from the second region 102 to the first region 101 is 25% to 100%.

[0044] In this embodiment, microalgae can efficiently absorb and enrich nutrients such as nitrogen and phosphorus from wastewater, including ammonium salts, nitrates, nitrites, and phosphates. After absorption, these elements are used by the microalgae to synthesize their own proteins, nucleic acids, and phospholipids, thus fixing the nitrogen and phosphorus in the wastewater within the microalgal cells. Microalgae can also directly absorb and utilize organic pollutants in wastewater, such as simple sugars, fatty acids, and amino acids, breaking them down into harmless substances like carbon dioxide and water through their own metabolic pathways. Furthermore, during their growth, microalgae secrete bioactive substances such as enzymes, antibiotics, and surfactants, which can catalytically degrade organic pollutants in wastewater and inhibit the growth of harmful microorganisms. Microalgae can also adsorb heavy metal ions from wastewater through complexation reactions or ion exchange. These heavy metal ions can undergo complexation reactions with negatively charged functional groups such as proteins, lipids, and polysaccharides within the cells, thereby removing heavy metals from the wastewater.

[0045] This invention uses a diaphragm 2 to divide the container 1 into two spaces. Sludge reacts in the first region 101, while microalgae perform photosynthesis in the second region 102, effectively improving the photosynthesis of microalgae. The diaphragm 2 prevents the high concentration of activated sludge in the first region 101 from mixing with the microalgae in the second region 102, ensuring the propagation of light in the second region 102. After photosynthesis, the microalgae are returned to the first region 101 through the return pipe, which can improve sludge activity, reduce aeration energy consumption in wastewater treatment, improve nitrogen and phosphorus removal efficiency in wastewater treatment, and reduce CO2 emissions during wastewater treatment, thereby improving the wastewater treatment effect.

[0046] In one embodiment, such as Figure 1 As shown, the wastewater treatment device also includes an aeration component 4, which is disposed in the first zone 101.

[0047] Specifically, in this embodiment, the aeration component 4 is disposed within the container 1, located at the bottom of the first region 101. The aeration component 4 includes an aerator and an aeration head. The aerator generates aeration bubbles, which are then uniformly released into the wastewater within the first region 101 through the aeration head. Aeration increases dissolved oxygen in the water, which helps promote the aerobic metabolism of activated sludge and accelerates the decomposition of organic matter. During aeration, organic matter in the wastewater reacts with oxygen, transforming into inorganic matter and water, thereby reducing the chemical oxygen demand (COD) in the wastewater. The greater the aeration rate, the higher the dissolved oxygen content in the wastewater, and the stronger the activity of microorganisms in the activated sludge, thus accelerating the decomposition and transformation of organic matter and improving the COD removal rate. The stirring and mixing action generated during aeration promotes water circulation, achieving full contact and mixing between the activated sludge and the wastewater. This not only helps the uniform distribution and growth of microorganisms but also improves the removal efficiency of organic matter.

[0048] In this embodiment, the number of aeration components 4 is not specifically limited. For example, in this embodiment, two aeration components 4 are provided.

[0049] The aeration generated by the aeration component 4 in the first region 101 of the present invention can forcibly dissolve oxygen in the air into the sewage, maintain a certain dissolved oxygen concentration in the sewage, and generate sufficient mixing and water circulation in the first region 101, so as to promote full contact and mixing between activated sludge and sewage, prevent suspended solids from settling, and keep the biological solids in the water in a suspended state, ensuring effective contact and reaction between microorganisms and organic matter.

[0050] In one embodiment, such as Figure 1 As shown, the wastewater treatment device also includes a first stirring assembly 5, which is disposed in the first region 101.

[0051] Specifically, in this embodiment, the first stirring component 5 is disposed inside the container 1 and located at the bottom of the first region 101. The first stirring component 5 includes a first driver and a first blade. The first driver is installed at the bottom of the first region 101, and the first blade is rotatably mounted on the first driver.

[0052] In this embodiment, the stirring component effectively prevents the deposition of activated sludge in the first region 101 by generating a stable and uniform horizontal flow, keeping the sludge in suspension. This allows the sludge and wastewater to come into more full contact, promoting the biochemical reaction between them, accelerating the degradation process of pollutants, and improving the efficiency of the biochemical reaction, thereby significantly improving the efficiency of wastewater treatment.

[0053] In this embodiment, the first stirring component 5 is disposed between the two aeration components 4. The horizontal flow generated by the first stirring component 5 can prolong the residence time of bubbles in water, increase the contact area and time between bubbles and sewage, improve the oxygen transfer efficiency, thereby enhancing the activity of activated sludge and promoting the oxidative decomposition of organic matter.

[0054] The present invention provides a first stirring component 5 in the first region 101, which can maintain the circulation rate of the water in the first region 101, keep the mixed liquid in the first region 101 in a suspended state, ensure that the microorganisms and sludge are in full contact, and promote the biochemical reaction. The first stirring component 5 can also ensure that the sludge and sewage are fully mixed, improve the treatment efficiency, and reduce sludge deposition.

[0055] In one embodiment, such as Figure 1 As shown, the wastewater treatment device also includes a second stirring assembly 6, which is disposed in the second region 102.

[0056] Specifically, in this embodiment, the second stirring component 6 is disposed inside the container 1 and located at the bottom of the second region 102. The second stirring component 6 includes a driver and a second blade. The second driver is installed at the bottom of the second region 102, and the second blade is rotatably mounted on the second driver.

[0057] The present invention provides a second stirring component 6 in the second region 102, which can make the microalgae mix evenly in the second region 102, thereby improving the reaction efficiency of microalgae photosynthesis.

[0058] In one embodiment, such as Figure 1 As shown, the wastewater treatment device also includes a return inlet 103 and a return outlet 104. The return inlet 103 is installed on the container 1 and located on one side of the first region 101. The return outlet 104 is installed on the container 1 and located on one side of the second region 102. The return pipe connects the return inlet 103 and the return outlet 104.

[0059] Specifically, in this embodiment, the return inlet 103 is located on the outer wall of the container 1 on one side of the first region 101, the return outlet 104 is located on the outer wall of the container 1 on one side of the second region 102, and the return pipe is located outside the container 1. The two ends of the return pipe are connected to the return inlet 103 and the return outlet 104, respectively. After the microalgae perform photosynthesis in the second region 102, they return to the first region 101 through the return pipe to participate in the sewage treatment reaction.

[0060] The present invention uses a return pipe to connect the return inlet 103 and the return outlet 104, which enables microalgae to undergo photosynthesis in the second region 102 and then be input into the first region 101 to participate in sewage treatment. This avoids the high concentration of activated sludge in the first region 101 from hindering the propagation of light in the sewage treatment device due to absorption and scattering, thereby improving the propagation and utilization efficiency of light in the sewage treatment device.

[0061] In one embodiment, such as Figure 1 As shown, the wastewater treatment device also includes an inlet 105 and an outlet 106. The inlet 105 is disposed on the container 1 and located on one side of the first area 101. The inlet 105 is adapted to input wastewater into the first area 101. The outlet 106 is disposed on the container 1 and located on one side of the second area 102. The outlet 106 is adapted to output treated water.

[0062] Specifically, in this embodiment, a portion of the water treated in the first region 101 flows through the diaphragm 2 into the second region 102. Due to the large weight of the microalgae, the water containing the microalgae is located below the second region 102, while the supernatant is located above it. After the microalgae in the second region 102 photosynthesize, a portion of the supernatant is discharged from the outlet 106 after a period of settling. After the supernatant is discharged, the total amount of water in the container 1 decreases, and then the wastewater to be treated is added back into the first region 101 through the inlet 105.

[0063] The present invention provides an outlet 106 to discharge the treated supernatant for reuse or direct discharge, and an inlet 105 to replenish the sewage in the first area 101, thereby achieving continuous water treatment.

[0064] In one embodiment, such as Figure 1 As shown, the inlet 105 is located below the return inlet 103, and the outlet 106 is located above the return outlet 104.

[0065] Specifically, in this embodiment, since the water containing microalgae has a high density, it can be returned to the first region 101 through the return outlet 104 below.

[0066] The present invention places the inlet 105 below the return inlet 103, so that the sewage entering from the bottom up can disturb the water in the first area 101 and improve the sewage treatment effect. Placing the outlet 106 above the return outlet 104 can prevent the discharge of water containing microalgae in the second area 102, thus ensuring the number of microalgae in the return water.

[0067] In one embodiment, a reflux valve is provided on the reflux pipe.

[0068] Specifically, in this embodiment, a reflux valve is provided on the reflux pipe, an inlet control valve is provided on the inlet 105, and an outlet control valve is provided on the outlet 106.

[0069] The present invention features a reflux valve on the reflux pipe, which enables regulation of the reflux flow rate and improves the wastewater treatment effect.

[0070] In one embodiment, the volume ratio of the first region 101 to the second region 102 is 1:1 to 3:1.

[0071] Specifically, in this embodiment, the volume of the first region 101 is set to be no less than the volume of the second region 102, which can ensure the effect of sewage treatment.

[0072] In this embodiment, a first sensor and a second sensor are respectively installed in the first region 101 and the second region 102. The first sensor, the second sensor, the light source 3, and the control valve are connected by signals. For example, the first sensor and the second sensor are a carbon dioxide sensor and an oxygen sensor, respectively. The carbon dioxide sensor is used to detect the CO2 content in the water in the first region 101 in real time, and the oxygen sensor is used to detect the O2 content in the water in the second region 102 in real time. When the CO2 content in the water in the first region 101 is higher than a preset value, the light source 3 is turned on to enable the microalgae in the second region 102 to perform photosynthesis. When the O2 content in the water in the second region 102 reaches the preset value, the reflux valve is opened to return the water in the second region 102 to the first region 101 for water treatment.

[0073] In some other embodiments, the first sensor may also be a COD sensor for detecting the chemical oxygen demand within the first region 101.

[0074] Secondly, such as Figure 2 As shown, the present invention also provides a wastewater treatment method applied to the above-mentioned wastewater treatment device, the wastewater treatment method comprising:

[0075] S1: Add wastewater and activated sludge into the first zone 101, and add microalgae into the second zone 102;

[0076] S2: After the initial treatment, start the aeration component 4, the return valve, the first stirring component 5, the second stirring component 6, and the light source 3;

[0077] S3: After the second time processing, shut off the aeration component 4, the return valve, the first stirring component 5, the second stirring component 6, and the light source 3;

[0078] S4: After standing for three hours, part of the supernatant is discharged from outlet 106.

[0079] Specifically, with the aeration component 4, light source 3, and return valve closed, wastewater is first introduced into the first zone 101 of container 1, and microalgae are added into the second zone 102. The activated sludge in the first zone 101 treats the wastewater, and some of the CO2 and inorganic salts produced during treatment enter the second zone 102 through the diaphragm 2. After the first treatment, the aeration component 4, return valve, first stirring component 5, second stirring component 6, and light source 3 are turned on. The aeration component 4 increases aeration of the wastewater in the first zone 101, improving the aerobic capacity. The first stirring component 5 promotes water flow. The light source 3 provides energy for photosynthesis for the microalgae in the second zone 102. The second stirring component 6 improves the water flow in the second zone 102. After the return valve is turned on, the photosynthesized microalgae and organic matter are transported back to the first zone 101 through the return pipe. After the second treatment period, the aeration component 4, the return valve, the first stirring component 5, the second stirring component 6, and the light source 3 are shut off. The microalgae in the first zone 101 are returned to participate in wastewater treatment, while some of the microalgae in the second zone 102 gradually settle. After a third settling period, a portion of the supernatant is discharged from the outlet 106.

[0080] In this embodiment, the sludge concentration in the first region 101 is 1000 mg / L to 3000 mg / L, and the microalgae concentration in the second region 102 is 150 mg / L to 1000 mg / L.

[0081] In this embodiment, the first time period is 6h to 8h, the second time period is 8h to 12h, and the third time period is 3h to 4h.

[0082] In this embodiment, the amount of supernatant discharged is 1 / 3 to 1 / 2 of the wastewater treatment scale.

[0083] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A wastewater treatment method, characterized in that, Applied to a wastewater treatment device, the wastewater treatment device comprising: Container (1), the interior of which is a receiving cavity; A diaphragm (2) is disposed inside the container (1), the diaphragm (2) is mounted on a frame, the frame is detachably mounted inside the container (1), the diaphragm (2) divides the containment cavity into a first region (101) and a second region (102), the diaphragm (2) is suitable for the passage of small molecules and dissolved solids; Light source (3), the light source (3) is set on one side of the second region (102), a first sensor for real-time detection of CO2 content in water is set in the first region (101), and a second sensor for real-time detection of O2 content in water is set in the second region (102). A return pipe, the return pipe connecting the first region (101) and the second region (102), and a return valve is provided on the return pipe; An aeration component (4) is disposed within the first region (101); The first stirring component (5) is disposed within the first region (101); The second stirring component (6) is disposed within the second region (102); A return inlet (103) is provided on the container (1) and located on one side of the first region (101); A return outlet (104) is provided on the container (1) and located on one side of the second region (102). The return pipe connects the return inlet (103) and the return outlet (104). Water inlet (105), the water inlet (105) is disposed on the container (1) and located on one side of the first area (101), the water inlet (105) is adapted to input sewage into the first area (101); The outlet (106) is provided on the container (1) and located on one side of the second region (102). The outlet (106) is suitable for discharging treated water. The wastewater treatment method includes: Wastewater and activated sludge are added to the first zone (101), and microalgae are added to the second zone (102); After the initial treatment, the aeration component (4), the return valve, the first stirring component (5), the second stirring component (6), and the light source (3) are turned on. After the second time processing, the aeration component (4), the return valve, the first stirring component (5), the second stirring component (6) and the light source (3) are shut off. After standing for three hours, part of the supernatant is discharged from the outlet (106); Specifically, with the aeration component (4), light source (3), and return valve closed, wastewater is first introduced into the first zone (101) of container (1), and microalgae are added into the second zone (102). The activated sludge in the first zone (101) treats the wastewater, and some of the CO2 and inorganic salts produced by the treatment enter the second zone (102) through the diaphragm (2). After the first treatment, the aeration component (4), return valve, first stirring component (5), second stirring component (6), and light source (3) are turned on. The aeration component (4) increases the aeration of the wastewater in the first zone (101) and increases the aerobic capacity. The first stirring component (5) promotes the aeration of the wastewater in the first zone (101). The influent flows, and the light source (3) provides energy for photosynthesis for the microalgae in the second area (102). The second stirring component (6) increases the flow of water in the second area (102). After the return valve is opened, the microalgae and organic matter after photosynthesis are transported to the first area (101) through the return pipe. After the second time treatment, the aeration component (4), the return valve, the first stirring component (5), the second stirring component (6) and the light source (3) are closed. The microalgae that flow back to the first area (101) participate in the sewage treatment. Some of the microalgae in the second area (102) gradually sink. After the third time of settling, some of the supernatant is discharged from the outlet (106).

2. The wastewater treatment method according to claim 1, characterized in that, The inlet (105) is located below the return inlet (103), and the outlet (106) is located above the return outlet (104).

3. The wastewater treatment method according to claim 1, characterized in that, The volume ratio of the first region (101) to the second region (102) is 1:1 to 3:1.

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