Sewage treatment device and sewage treatment method

Abstract

The invention relates to the technical field of sewage treatment, and discloses a sewage treatment device and a sewage treatment method.The sewage treatment device comprises a container, a diaphragm, a light source and a backflow pipe, a containing cavity is formed in the container, the diaphragm is arranged in the container and divides the containing cavity into a first area and a second area, and the diaphragm is suitable for small molecules and soluble solids to pass through; the light source is arranged on one side of the second area, the backflow pipe is communicated with the first area and the second area, the interior of the container is divided into two spaces through the diaphragm, sludge can only react in the first area, microalgae can only conduct photosynthesis in the second area, and the microalgae subjected to photosynthesis flows back into the first area through the backflow pipe, so that the microalgae can be recycled, and the yield of the microalgae is improved. The sludge activity can be improved, the sewage treatment aeration energy consumption can be reduced, the sewage treatment nitrogen and phosphorus removal effect can be improved, and CO2 emission in the sewage treatment process can be reduced, so that the pollution reduction and carbon reduction coordinated synergism target of sewage treatment can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage treatment device and a sewage treatment method. Background Art

[0002] As people's living standards continue to improve, the amount of domestic sewage is increasing rapidly, and the pollutants carried by domestic sewage have brought tremendous environmental pressure. The problem of domestic sewage treatment has received widespread attention. At present, most domestic sewage treatment plants use the activated sludge method, but this sewage treatment method has problems such as high aeration energy consumption, difficulty in nitrogen and phosphorus removal, and high CO2 emissions. Since the organic secretions produced by microalgae can be used to promote the growth of microorganisms in microalgae co-cultivation, microalgae photosynthesis provides aerobic microorganisms with the O2 required for growth, and the growth and reproduction of microalgae fix CO2, domestic sewage treatment technology based on microalgae co-cultivation is considered to be the most promising technology to solve the above-mentioned sewage treatment problems and has received widespread attention.

[0003] In the domestic sewage treatment technology based on microalgae co-cultivation, light supply is one of the most important process control contents. Through light source control, the microalgae are provided with the necessary light conditions for photosynthesis. In order to improve the sewage treatment efficiency and reduce the floor space of sewage treatment facilities, it is usually necessary to maintain a high activated sludge concentration in the sewage treatment system.

[0004] In the sewage treatment device of the prior art, a high activated sludge concentration will hinder the propagation of light in the sewage treatment device due to absorption, scattering and the like, affecting the photosynthesis of microalgae, thereby resulting in poor sewage treatment effect. Summary of the invention

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

[0006] In the first aspect, the present invention provides a sewage treatment device, including a container, a diaphragm, a light source and a return pipe, the interior of the container is a containing cavity, the diaphragm is arranged in the container, the diaphragm divides the containing cavity into a first area and a second area, the diaphragm is suitable for small molecules and soluble solids to pass through, the light source is arranged on one side of the second area, and the return pipe connects the first area and the second area.

[0007] Beneficial effects: The present invention uses a diaphragm to divide the container into two spaces. The sludge can only react in the first area, and the microalgae can only perform photosynthesis in the second area. The microalgae after photosynthesis will flow back to the first area through the reflux pipe, which can improve the sludge activity, reduce the aeration energy consumption of sewage treatment, improve the nitrogen and phosphorus removal effect of sewage treatment, and reduce CO2 emissions during sewage treatment, thereby achieving the goal of coordinated efficiency improvement of pollution reduction and carbon reduction in sewage treatment.

[0008] In an optional embodiment, the sewage treatment device further includes an aeration component, and the aeration component is disposed in the first area.

[0009] Beneficial effects: The aeration generated by the aeration assembly of the present invention in the first area can force the oxygen in the air to dissolve into the sewage, maintain a certain dissolved oxygen concentration in the sewage, and produce sufficient mixing action and water circulation in the first area, so as to promote the full contact and mixing of the activated sludge and the sewage, prevent the suspended matter from sinking, and keep the biological solids in the water in a suspended state, thereby ensuring the effective contact and reaction between the microorganisms and the organic matter.

[0010] In an optional embodiment, the sewage treatment device further includes a first stirring component, and the first stirring component is disposed in the first area.

[0011] Beneficial effects: The present invention sets a first stirring component in the first area, which can maintain the circulation flow rate of the water body in the first area, keep the mixed liquid in the first area in a suspended state, ensure that the microorganisms are in full contact with the sludge, and promote the biochemical reaction; setting 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 an optional embodiment, the sewage treatment device further includes a second stirring component, and the second stirring component is disposed in the second area.

[0013] Beneficial effect: According to the present invention, the second stirring component is arranged in the second area so that the microalgae can be evenly mixed in the second area, thereby improving the reaction efficiency of the photosynthesis of the microalgae.

[0014] In an optional embodiment, the sewage treatment device also includes a reflux inlet and a reflux outlet. The reflux inlet is arranged on the container and is located on one side of the first area. The reflux outlet is arranged on the container and is located on one side of the second area. The reflux pipe connects the reflux inlet and the reflux outlet.

[0015] Beneficial effect: The present invention adopts a reflux pipe to connect the reflux inlet and the reflux outlet, so that the microalgae can be input into the first area to participate in sewage treatment after photosynthetic reaction in the second area, avoiding the high activated sludge concentration in the first area from hindering the propagation of light in the sewage treatment device due to absorption, scattering and other effects, thereby improving the propagation and utilization efficiency of light in the sewage treatment device.

[0016] In an optional embodiment, the sewage treatment device also includes a water inlet and a water outlet, the water inlet is arranged on the container and located on one side of the first area, the water inlet is suitable for inputting sewage into the first area, and the water outlet is arranged on the container and located on one side of the second area, and the water outlet is suitable for outputting treated water.

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

[0018] In an optional embodiment, the water inlet is located below the backflow water inlet, and the water outlet is located above the backflow water outlet.

[0019] Beneficial effects: The water inlet of the present invention is located below the backflow inlet, and the sewage input from the bottom to the top can disturb the water body in the first area, thereby improving the sewage treatment effect. The water outlet is located above the backflow outlet to avoid the discharge of water containing microalgae in the second area, thereby ensuring the number of microalgae in the backflow water body.

[0020] In an optional embodiment, a reflux valve is provided on the reflux pipe.

[0021] Beneficial effect: The present invention provides a reflux valve on the reflux pipe to achieve regulation of the reflux flow rate and improve the sewage treatment effect.

[0022] In an optional embodiment, the volume ratio of the first region to the second region is 1:1 to 3:1.

[0023] In a second aspect, the present invention further provides a sewage treatment method, which is applied to the above-mentioned sewage treatment device, and the sewage treatment method comprises:

[0024] Sewage and activated sludge are added into the first area, and microalgae are added into the second area;

[0025] After the first time of treatment, the aeration component, the reflux valve, the first stirring component, the second stirring component and the light source are turned on;

[0026] After the second time of treatment, the aeration component, the reflux valve, the first stirring component, the second stirring component and the light source are closed;

[0027] After standing for the third time, part of the supernatant is discharged from the water outlet.

[0028] Since the sewage treatment method is applied to the sewage treatment device in the present invention, it has the same beneficial effects as the sewage treatment device, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic structural diagram of a sewage treatment device according to an embodiment of the present invention;

[0031] Figure 2 Schematic diagram of the process of sewage treatment according to an embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 1. Container; 101. First area; 102. Second area; 103. Backflow water inlet; 104. Backflow water outlet; 105. Water inlet; 106. Water outlet; 2. Diaphragm; 3. Light source; 4. Aeration component; 5. First stirring component; 6. Second stirring component. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0035] Combine the following Figure 1 and Figure 2 , describing an embodiment of the present invention.

[0036] According to an embodiment of the present invention, on the one hand, Figure 1 As shown, a sewage treatment device is provided, including a container 1, a diaphragm 2, a light source 3 and a return pipe. The interior of the container 1 is a containing cavity, the diaphragm 2 is arranged in the container 1, and the diaphragm 2 divides the containing cavity into a first area 101 and a second area 102. The diaphragm 2 is suitable for small molecules and soluble solids to pass through. The light source 3 is arranged on one side of the second area 102, and the return pipe connects the first area 101 and the second area 102.

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

[0038] In this embodiment, the volume of the container 1 is 1 / 2 to 2 times the scale of 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, and the pore size of the microfiltration membrane is less than 0.3 μm. The microfiltration membrane allows small molecules and soluble solids (inorganic salts) to pass through, but will intercept suspended matter and high molecular weight colloids. In this embodiment, the structure in which the diaphragm 2 is arranged inside the container 1 can make the overall structure of the sewage treatment device more compact and reduce the space occupied. The microfiltration membrane is installed on the frame, and the frame can be detachably installed inside the container 1. After the sewage is treated for a certain period of time, the diaphragm 2 can be taken out of the container 1 and replaced.

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

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

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

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

[0044] In the present embodiment, microalgae can efficiently absorb and enrich the nutrients such as nitrogen and phosphorus in sewage, such as ammonium salts, nitrates, nitrites and phosphates, etc. After these elements are absorbed by microalgae, they are used to synthesize biological macromolecules such as proteins, nucleic acids and phospholipids of their own, thereby fixing nitrogen and phosphorus in sewage in microalgae cells. Microalgae can also directly absorb and utilize organic pollutants in sewage, such as simple sugars, fatty acids and amino acids, etc., and decompose them into harmless substances such as carbon dioxide and water through their own metabolic pathways. In addition, microalgae can secrete some biologically active substances during growth, such as enzymes, antibiotics and surfactants, etc., which can catalyze and degrade organic pollutants in sewage and inhibit the growth of harmful microorganisms. Microalgae can also absorb heavy metal ions in wastewater through complex reaction or ion exchange, and these heavy metal ions can react with negatively charged functional groups such as proteins, lipids and polysaccharides in cells, thereby removing heavy metals in sewage.

[0045] The present invention uses a diaphragm 2 to separate the container 1 into two spaces. The sludge reacts in the first area 101, and the microalgae photosynthesizes in the second area 102, which effectively improves the photosynthesis of the microalgae. The diaphragm 2 can prevent the high-concentration activated sludge in the first area 101 from mixing with the microalgae in the second area 102, thereby ensuring the propagation of light in the second area 102. The microalgae after photosynthesis then flow back to the first area 101 through the reflux pipe, which can improve the sludge activity, reduce the aeration energy consumption of sewage treatment, improve the nitrogen and phosphorus removal effect of sewage treatment, and reduce CO2 emissions during sewage treatment, thereby improving the effect of sewage treatment.

[0046] In one embodiment, Figure 1 As shown, the sewage treatment device further includes an aeration component 4 , and the aeration component 4 is disposed in the first area 101 .

[0047] Specifically, in this embodiment, the aeration assembly 4 is arranged in the container 1, located at the bottom of the first area 101, and the aeration assembly 4 includes an aerator and an aeration head. The aerator is used to generate aeration bubbles, and the aeration bubbles are uniformly released into the sewage in the first area 101 through the aeration head. Aeration can increase the dissolved oxygen in the water body, which helps to promote the aerobic metabolism of the activated sludge and accelerate the decomposition of organic matter. During the aeration process, the organic matter in the sewage reacts with oxygen and is converted into inorganic matter and water, thereby reducing the chemical oxygen demand (COD) in the sewage. The greater the aeration volume, the higher the dissolved oxygen content in the wastewater, and the stronger the activity of the microorganisms in the activated sludge, thereby accelerating the decomposition and conversion of organic matter and improving the removal rate of COD. The stirring and mixing effect generated during the aeration process promotes the circulation of water, and realizes the full contact and mixing of the activated sludge and sewage. 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 assembly 4 of the present invention in the first area 101 can force the oxygen in the air to dissolve into the sewage, maintain a certain dissolved oxygen concentration in the sewage, and produce sufficient mixing action and water circulation in the first area 101, so as to promote full contact and mixing of the activated sludge and the sewage, prevent the suspended matter from sinking, and keep the biological solids in the water in a suspended state, thereby ensuring effective contact and reaction between the microorganisms and the organic matter.

[0050] In one embodiment, Figure 1 As shown, the sewage treatment device further includes a first stirring component 5 , and the first stirring component 5 is disposed in the first area 101 .

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

[0052] In this embodiment, the stirring component effectively prevents the sedimentation of activated sludge in the first area 101 by generating a stable and uniform horizontal flow, maintains the sludge in a suspended state, and enables the sludge and sewage to contact more fully, thereby promoting the biochemical reaction between the two, accelerating the degradation process of pollutants, and improving the efficiency of biochemical reactions, thereby significantly improving the efficiency of sewage treatment.

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

[0054] The present invention sets a first stirring component 5 in the first area 101, which can maintain the circulation flow rate of the water body in the first area 101, keep the mixed liquid in the first area 101 in a suspended state, ensure that the microorganisms are fully in contact with the sludge, and promote the biochemical reaction; setting 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, Figure 1 As shown, the sewage treatment device further includes a second stirring component 6 , and the second stirring component 6 is disposed in the second area 102 .

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

[0057] In the present invention, the second stirring assembly 6 is arranged in the second area 102 so that the microalgae can be evenly mixed in the second area 102, thereby improving the reaction efficiency of the photosynthesis of the microalgae.

[0058] In one embodiment, Figure 1 As shown, the sewage treatment device also includes a backflow inlet 103 and a backflow outlet 104. The backflow inlet 103 is arranged on the container 1, located on the side of the first area 101, and the backflow outlet 104 is arranged on the container 1, located on the side of the second area 102. The backflow pipe connects the backflow inlet 103 and the backflow outlet 104.

[0059] Specifically, in this embodiment, the reflux inlet 103 is arranged on the outer wall of the container 1 on the side of the first area 101, the reflux outlet 104 is arranged on the outer wall of the container 1 on the side of the second area 102, the reflux pipe is arranged outside the container 1, and the two ends of the reflux pipe are respectively connected to the reflux inlet 103 and the reflux outlet 104. After the microalgae performs photosynthesis in the second area 102, they flow back to the first area 101 through the reflux pipe to participate in the sewage treatment reaction.

[0060] The present invention adopts a reflux pipe to connect the reflux water inlet 103 and the reflux water outlet 104, so that the microalgae can be input into the first area 101 to participate in sewage treatment after photosynthetic reaction in the second area 102, thereby avoiding the high activated sludge concentration in the first area 101 from hindering the propagation of light in the sewage treatment device due to absorption, scattering and the like, thereby improving the propagation and utilization efficiency of light in the sewage treatment device.

[0061] In one embodiment, Figure 1 As shown, the sewage treatment device also includes a water inlet 105 and a water outlet 106. The water inlet 105 is arranged on the container 1 and is located on the side of the first area 101. The water inlet 105 is suitable for inputting sewage into the first area 101. The water outlet 106 is arranged on the container 1 and is located on the side of the second area 102. The water outlet 106 is suitable for outputting treated water.

[0062] Specifically, in this embodiment, part of the water treated in the first area 101 can flow into the second area 102 through the diaphragm 2. Due to the large weight of the microalgae, the water containing the microalgae is located below the second area 102, and the supernatant is located above the second area 102. After the microalgae in the second area 102 photosynthesizes, it is left to stand for a period of time and a part of the supernatant is discharged from the water outlet 106. After the supernatant is discharged, the total amount of water in the container 1 is reduced, and the sewage to be treated is then added to the first area 101 through the water inlet 105.

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

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

[0065] Specifically, in this embodiment, since the water containing microalgae has a relatively high density, the water can flow back into the first area 101 through the reflux outlet 104 at the bottom.

[0066] The present invention locates the water inlet 105 below the return water inlet 103, and the sewage input from the bottom to the top can disturb the water body in the first area 101, thereby improving the sewage treatment effect. The water outlet 106 is located above the return water outlet 104 to avoid the discharge of the water body containing microalgae in the second area 102, thereby ensuring the number of microalgae in the return water body.

[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, a water inlet control valve is provided at the water inlet 105 , and a water outlet control valve is provided at the water outlet 106 .

[0069] The present invention provides a reflux valve on the reflux pipe to achieve regulation of the reflux flow rate and improve the sewage 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 area 101 is set to be no less than the volume of the second area 102, which can ensure the sewage treatment effect.

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

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

[0074] Second, as Figure 2 As shown, the present invention also provides a sewage treatment method, which is applied to the above-mentioned sewage treatment device, and the sewage treatment method includes:

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

[0076] S2: After the first time of treatment, the aeration component 4, the reflux valve, the first stirring component 5, the second stirring component 6 and the light source 3 are turned on;

[0077] S3: After the second time of treatment, the aeration component 4, the reflux valve, the first stirring component 5, the second stirring component 6 and the light source 3 are closed;

[0078] S4: After standing for a third time, part of the supernatant is discharged from the water outlet 106 .

[0079] Specifically, the sewage is first introduced into the first area 101 of the container 1 when the aeration component 4, the light source 3 and the return valve are closed, and the microalgae are added into the second area 102. The activated sludge in the first area 101 treats the sewage, and part of the CO2 and inorganic salts generated by the treatment enter the second area 102 through the diaphragm 2. After the first 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. The aeration component 4 increases the aeration of the sewage in the first area 101 to increase the oxygen content, the first stirring component 5 promotes the flow of the water body, the light source 3 provides photosynthesis energy for the microalgae in the second area 102, and the second stirring component 6 increases the fluidity of the water body in the second area 102. After the return valve is turned on, the photosynthesized microalgae and organic matter are transported to the first area 101 through the return pipe. After the second treatment time, the aeration component 4, the reflux valve, the first stirring component 5, the second stirring component 6 and the light source 3 are closed, the microalgae in the first area 101 are returned to participate in the sewage treatment, and part of the microalgae in the second area 102 gradually sinks. After standing for a third time, part of the supernatant is discharged from the outlet 106.

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

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

[0082] In this embodiment, the supernatant discharge is 1 / 3 to 1 / 2 of the sewage treatment scale.

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

Claims

1. A sewage treatment device, characterized in that: include: A container (1), wherein the interior of the container (1) is a containing cavity; A diaphragm (2), the diaphragm (2) being arranged in the container (1), the diaphragm (2) dividing the containing cavity into a first area (101) and a second area (102), the diaphragm (2) being suitable for small molecules and soluble solids to pass through; a light source (3), the light source (3) being arranged on one side of the second area (102); A reflux pipe is provided, wherein the reflux pipe connects the first area (101) and the second area (102).

2. The sewage treatment device according to claim 1, characterized in that: Also includes: An aeration component (4), wherein the aeration component (4) is arranged in the first area (101).

3. The sewage treatment device according to claim 1, characterized in that: Also includes: A first stirring component (5), wherein the first stirring component (5) is arranged in the first area (101).

4. The sewage treatment device according to claim 1, characterized in that: Also includes: A second stirring component (6), wherein the second stirring component (6) is arranged in the second area (102).

5. The sewage treatment device according to claim 1, characterized in that: Also includes: a reflux water inlet (103), the reflux water inlet (103) being arranged on the container (1) and located on one side of the first area (101); A reflux water outlet (104), the reflux water outlet (104) being arranged on the container (1) and located on one side of the second area (102), the reflux pipe being connected to the reflux water inlet (103) and the reflux water outlet (104).

6. The sewage treatment device according to claim 5, characterized in that: Also includes: a water inlet (105), the water inlet (105) being arranged on the container (1) and located on one side of the first area (101), the water inlet (105) being suitable for inputting sewage into the first area (101); A water outlet (106), the water outlet (106) is arranged on the container (1) and is located on one side of the second area (102), and the water outlet (106) is suitable for outputting treated water.

7. The sewage treatment device according to claim 6, characterized in that: The water inlet (105) is located below the backflow water inlet (103), and the water outlet (106) is located above the backflow water outlet (104).

8. The sewage treatment device according to claim 1, characterized in that: The reflux pipe is provided with a reflux valve.

9. The sewage treatment device 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.

10. A sewage treatment method, applied to the sewage treatment device according to any one of claims 1 to 9, characterized in that: Wastewater treatment methods include: Adding sewage and activated sludge into the first area (101), and adding microalgae into the second area (102); After the first treatment, the aeration component (4), the reflux valve, the first stirring component (5), the second stirring component (6) and the light source (3) are turned on; After the second treatment period, the aeration component (4), the reflux valve, the first stirring component (5), the second stirring component (6) and the light source (3) are closed; After standing for a third time, part of the supernatant is discharged from the water outlet (106).

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