Bacteria-algae symbiotic whole-course autotrophic organism phosphorus removal device and method

Abstract

The invention relates to the technical field of sewage treatment, in particular to an algal-bacterial symbiotic whole-course autotrophic organism phosphorus removal device and method. The operation cost can be reduced, the energy consumption of the system is reduced, secondary pollution is avoided, and the phosphorus removal effect is further improved; comprising a photosynthetic reactor body, a bacteria-algae biological membrane filler assembly, an aeration mechanism, LED light sources, a wall cleaning mechanism and a water inlet pump, the photosynthetic reactor body is in a light-transmitting cylinder shape, the bacteria-algae biological membrane filler assembly is arranged in the photosynthetic reactor body and used for bacteria-algae biofilm formation, and the LED light sources are evenly distributed outside the photosynthetic reactor body in the circumferential direction. The LED light source provides illumination and promotes algae photosynthesis to produce oxygen and assimilate to remove phosphorus, the wall cleaning mechanism is used for cleaning the inner wall of the photosynthetic reactor main body, a discharge pipe is arranged on one side of the middle of the photosynthetic reactor main body, and a first switch valve is mounted at the discharge pipe; a blow-off pipe is arranged on one side of the bottom of the photosynthetic reactor main body, and a second switch valve is mounted on the blow-off pipe.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a device and method for removing phosphorus from bacteria-algae symbiotic autotrophic organisms throughout the process. Background Art

[0002] With the development of industries such as petroleum, chemical, food and pharmaceutical, and the continuous improvement of people's living standards, the content of ammonia nitrogen and phosphorus in various industrial wastewaters and urban domestic sewage has increased. Excessive content of nitrogen and phosphorus in water bodies will lead to a series of ecological and environmental problems such as eutrophication of water bodies, destroy the balance of the ecosystem, and even endanger human health. Therefore, the problem of efficient nitrogen and phosphorus removal in sewage should be paid attention to.

[0003] The full autotrophic process has great advantages in the treatment of high ammonia nitrogen wastewater. Compared with the traditional biological denitrification, which requires a certain amount of carbon source to support the thorough biological denitrification and excessive phosphorus uptake in the aerobic stage, the full autotrophic process uses the synergistic effect of ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria to achieve efficient biological denitrification, which can save about 60% of the aeration volume and 100% of the carbon source, while greatly reducing infrastructure investment, becoming a popular process in the field of wastewater denitrification. However, the full autotrophic process does not require a carbon source, so polyphosphate bacteria cannot be enriched in the reaction system, and the slow proliferation of its functional microorganisms leads to low sludge production, and phosphorus cannot be removed with the sludge discharged from the system, so the full autotrophic process does not have good phosphorus removal performance.

[0004] In order to achieve the goal of efficient nitrogen and phosphorus removal, it is possible to consider adding a carbon source or a phosphorus removal agent to the full autotrophic system or coupling other phosphorus removal processes. Adding a carbon source often increases operating costs and has a negative impact on the growth of anaerobic ammonia-oxidizing bacteria, thereby reducing nitrogen removal efficiency; adding a phosphorus removal agent also increases system operating energy consumption and has the problem of secondary pollution. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] Based on the fact that traditional anaerobic ammonium oxidation or fully autotrophic processes have poor phosphorus removal effects when treating high-ammonia nitrogen wastewater, the present invention provides a bacteria-algae symbiotic fully autotrophic biological phosphorus removal device and method that reduces operating costs, reduces system energy consumption, avoids secondary pollution, and further improves phosphorus removal effects.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a bacteria-algae symbiotic autotrophic biological phosphorus removal device, comprising a photosynthetic reactor body, a bacteria-algae biofilm filler assembly, an aeration mechanism, an LED light source, a wall cleaning mechanism and a water inlet pump, wherein the photosynthetic reactor body is in the shape of a light-transmitting cylinder, the bacteria-algae biofilm filler assembly is built into the photosynthetic reactor body, the bacteria-algae biofilm filler assembly is used for bacteria-algae biofilm hanging, the LED light source is circumferentially distributed on the outside of the photosynthetic reactor body, the LED light source provides illumination to promote algae photosynthesis oxygen production and assimilation and phosphorus removal, the wall cleaning mechanism is used for cleaning the inner wall of the photosynthetic reactor body, a discharge pipe is provided on one side of the middle part of the photosynthetic reactor body, and a first switch valve is installed at the discharge pipe; the output end of the water inlet pump extends into the photosynthetic reactor body At the bottom of the body, a sewage pipe is provided on one side of the bottom of the photosynthetic reactor body, and a second switch valve is installed on the sewage pipe; further, the discharge pipe is used for discharging the treated sewage in the photosynthetic reactor body, and the sewage pipe is used for discharging mud / algae; the LED light source is placed outside the photosynthetic reactor body to reduce the incidence of leakage accidents, and at the same time avoid the attachment of sludge, bacteria and algae to the LED light source, so as to ensure smooth contact between the photosynthetic reactor body and the light source; the LED light source, aeration mechanism and wall cleaning mechanism are all automatically controlled by an external PLC system, and the PLC system can adopt a conventional PLC control cabinet known on the market, which will not be further described here; wastewater is supplied to the photosynthetic reactor body through a water inlet pump; the photosynthetic reactor body is preferably made of transparent acrylic material, and other materials such as transparent glass can also be used.

[0009] Preferably, the wall cleaning mechanism includes two electromagnets, a permanent magnetic core slidably installed up and down in the photosynthetic reactor body, an impeller rotatably installed on the permanent magnetic core, and brushes uniformly distributed on the impeller in the circumferential direction; the two electromagnets are respectively installed on the upper and lower parts of the photosynthetic reactor body, wherein a group of electromagnets at the bottom of the photosynthetic reactor body have the same magnetic poles as the bottom of the permanent magnetic core, and a group of electromagnets at the top of the photosynthetic reactor body have opposite magnetic poles to the top of the permanent magnetic core, the outer diameter of the permanent magnetic core matches the inner diameter of the photosynthetic reactor body, and a through opening is provided in the middle of the permanent magnetic core.

[0010] Preferably, the upper portion of the permanent magnetic core is provided with a conical groove portion and a plurality of through openings penetrating upward and downward.

[0011] Preferably, the aeration mechanism includes an aeration pump and a probe-type dissolved oxygen monitor, the output end of the aeration pump extends to the bottom of the photosynthetic reactor body, and the detection end of the probe-type dissolved oxygen monitor extends into the wastewater in the photosynthetic reactor body; further, an aeration assembly is installed at the bottom of the photosynthetic reactor body, the output end of the aeration pump is connected to the aeration assembly, and the aeration assembly includes an aeration pipe and an aeration head installed on the aeration pipe.

[0012] Preferably, the bacteria-algae biofilm filler assembly includes a hanger built into the middle of the photosynthetic reactor body and a sponge filler suspended on the hanger; the hanger can be rotatably installed at the bottom of the photosynthetic reactor body; further, the hanger adopts a stainless steel frame, and the sponge filler adopts a cubic sponge block.

[0013] A method for removing phosphorus from bacteria and algae by autotrophic biological dephosphorization during the whole process, using the above-mentioned device for removing phosphorus from bacteria and algae by autotrophic biological dephosphorization during the whole process to treat wastewater, comprising the following steps:

[0014] S1, the main body of the photosynthetic reactor is started, inoculated with 3-10g / L of autotrophic sludge and 0.2-1.0g / L of Chlorella in the logarithmic growth period, and acclimated until the surface and pores of the sponge filler form a symbiotic biofilm of bacteria and algae;

[0015] S2. The wastewater is pumped into the photosynthetic reactor body through the water inlet pump, and a sequencing batch operation process is adopted, including water inlet, aeration, sedimentation and drainage processes. The water inlet and aeration processes are the light stage, the LED light source is turned on, the light source intensity is controlled, and the dissolved oxygen concentration of the system is adjusted; the sedimentation and drainage processes are the dark stage, and the light / dark time ratio is controlled to be 12h:12h or 10h:2h or 6h:2h according to the phosphorus removal treatment effect;

[0016] S3, the treated wastewater is discharged through the discharge pipe in the middle of the photosynthetic reactor body;

[0017] S4. Repeat S1-S3 to continuously treat the wastewater.

[0018] Preferably, the LED light source intensity is 2000-5000 lux;

[0019] Preferably, the dissolved oxygen concentration is controlled at 1-3 mg / L;

[0020] Preferably, the cleaning frequency of the inner wall of the photosynthetic reactor body is once every 10 days, each time for 5 minutes, and the rotation speed of the brush on the impeller is 10-30 rpm.

[0021] (III) Beneficial effects

[0022] Compared with the prior art, the present invention provides a device and method for the complete autotrophic phosphorus removal of bacteria and algae symbiosis, which has the following beneficial effects:

[0023] 1. Efficient nitrogen and phosphorus removal: By inoculating Chlorella in the whole autotrophic reaction system to form a bacterial-algae symbiotic biofilm, it has good stability and can play a good synergistic role between bacteria and microalgae. It has good nitrogen and phosphorus removal performance, especially greatly improving the phosphorus removal rate.

[0024] 2. Reduce energy consumption: In the reaction system, microalgae can use the carbon dioxide produced by bacteria for photosynthesis, and at the same time, the oxygen produced by microalgae is used to supply the growth needs of bacteria. Therefore, the system further reduces mechanical aeration and effectively saves energy consumption.

[0025] 3. In line with the low-carbon concept; the reaction system can achieve energy self-sufficiency through the nutrient exchange mechanism of microalgae and bacteria, so the system does not need an external carbon source, which is in line with the low-carbon energy-saving concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 It is a front plan view structural schematic diagram of the present invention;

[0028] Figure 3 The present invention Figure 2 Schematic diagram of the cross-section structure at AA in the middle;

[0029] Figure 4 It is a three-dimensional structural schematic diagram of the connection relationship between the permanent magnetic core and the impeller of the present invention;

[0030] Figure 5 The present invention Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0031] Figure 6 The present invention Figure 1 A schematic diagram of the partially enlarged structure at B in the middle;

[0032] Figure 7 The present invention Figure 3 A schematic diagram of the partially enlarged structure at C in the middle;

[0033] Markings in the attached figure: 1. photosynthetic reactor body; 2. LED light source; 3. water inlet pump; 4. discharge pipe; 5. first switch valve; 6. electromagnet; 7. permanent magnetic core; 8. impeller; 9. brush; 10. through-hole; 11. conical groove; 12. through-hole; 13. aeration pump; 14. probe-type dissolved oxygen monitor; 15. bracket; 16. sponge filler; 17. sewage pipe; 18. second switch valve. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the invention, the technical solutions in the embodiments of the invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the invention. Obviously, the described embodiments are only embodiments of a part of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the invention.

[0035] As described in the background technology, the fully autotrophic process does not require a carbon source, so polyphosphate bacteria cannot be enriched in the reaction system. The slow proliferation of its functional microorganisms leads to low sludge production, and phosphorus cannot be removed with the sludge discharged from the system. Therefore, the fully autotrophic process does not have good phosphorus removal performance; adding an external carbon source often increases operating costs and has a negative impact on the growth of anaerobic ammonia-oxidizing bacteria, thereby reducing nitrogen removal efficiency; adding an external phosphorus removal agent also increases the energy consumption of the system operation, and there is a problem of secondary pollution.

[0036] In order to solve this technical problem, the present invention provides a device and method for biophosphorus removal by autotrophic bacteria-algae symbiosis, which is applied to sewage treatment.

[0037] It should be noted that, in the absence of conflict, the embodiments of the invention and the features and technical solutions in the embodiments may be combined with each other.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] Example 1

[0040] Specifically, please refer to Figure 1-3 The device for complete autotrophic phosphorus removal by bacteria-algae symbiosis specifically comprises: a photosynthetic reactor body 1, a bacteria-algae biofilm filler assembly, an aeration mechanism, an LED light source 2, a wall cleaning mechanism and a water inlet pump 3. The photosynthetic reactor body 1 is a light-transmitting cylindrical body. The bacteria-algae biofilm filler assembly is built into the photosynthetic reactor body 1. The bacteria-algae biofilm filler assembly is used for bacteria-algae biofilm hanging. The LED light source 2 is evenly distributed on the outside of the photosynthetic reactor body 1 in a circumferential direction. The LED light source 2 provides light to promote algae photosynthesis oxygen production and assimilation and phosphorus removal. The wall cleaning mechanism is used for cleaning the inner wall of the photosynthetic reactor body 1. A discharge pipe 4 is provided on one side of the middle part of the photosynthetic reactor body 1, and a first switch valve 5 is installed at the discharge pipe 4; the output end of the water inlet pump 3 extends into the bottom of the photosynthetic reactor body 1, and a first switch valve 5 is installed at the discharge pipe 4; the output end of the water inlet pump 3 extends into the bottom of the photosynthetic reactor body 1, and a first switch valve 5 is installed at the bottom of the photosynthetic reactor body 1. A sewage pipe 17 is provided on the side, and a second switch valve 18 is installed on the sewage pipe 17; further, the discharge pipe 4 is used for discharging the treated sewage in the photosynthetic reactor body 1, and the sewage pipe 17 is used for discharging mud / algae; the LED light source 2 is placed outside the photosynthetic reactor body 1 to reduce the incidence of leakage accidents, and at the same time avoid sludge, bacteria and algae from adhering to the LED light source 2, so as to ensure smooth contact between the photosynthetic reactor body 1 and the light source; the LED light source 2, the aeration mechanism and the wall cleaning mechanism are all automatically controlled by an external PLC system, and the PLC system can adopt a conventional PLC control cabinet known on the market, which will not be further described here; wastewater is supplied to the photosynthetic reactor body 1 through the water inlet pump 3; the photosynthetic reactor body 1 is preferably made of transparent acrylic material, and other materials such as transparent glass can also be used.

[0041] Please refer to Figure 3-4 The wall cleaning mechanism includes two electromagnets 6, a permanent magnetic core 7 slidably installed in the photosynthetic reactor body 1, an impeller 8 rotatably installed on the permanent magnetic core 7, and a brush 9 uniformly distributed on the impeller 8 in the circumferential direction; the two electromagnets 6 are respectively installed on the upper and lower parts of the photosynthetic reactor body 1, wherein a group of electromagnets 6 at the bottom of the photosynthetic reactor body 1 has the same magnetic pole as the bottom of the permanent magnetic core 7, and a group of electromagnets 6 at the top of the photosynthetic reactor body 1 has opposite magnetic poles to the top of the permanent magnetic core 7, the outer diameter of the permanent magnetic core 7 is consistent with the inner diameter of the photosynthetic reactor body 1, and a through hole 10 is provided in the middle of the permanent magnetic core 7.

[0042] Please refer to Figure 5 The upper part of the permanent magnetic core 7 is provided with a conical groove portion 11 and a plurality of through openings 12 penetrating from top to bottom.

[0043] The bacteria-algae symbiotic autotrophic biological phosphorus removal device provided in this embodiment has a lot of sludge and algae attached to the inner wall of the photosynthetic reactor body 1 after being used for a period of time, thereby affecting the light transmittance and affecting the normal growth of bacteria and algae on the bacteria-algae biofilm filler component. Although the traditional rotary cleaning component can clean the inner wall of the photosynthetic reactor body 1, the rotary cleaning component often covers a larger area of ​​the photosynthetic reactor body 1 to achieve the cleaning purpose, affecting the amount of light source incident. For this reason, the wall cleaning mechanism in this embodiment, when it is necessary to clean the inner wall of the photosynthetic reactor body 1, starts the two electromagnets 6, and a group of electromagnets 6 at the bottom of the photosynthetic reactor body 1 generates a repulsive force on the permanent magnetic core 7, while a group of electromagnets 6 at the top of the photosynthetic reactor body 1 generates an attractive force on the permanent magnetic core 7. The combined force of the repulsive force and the attractive force is greater than the dead weight of the permanent magnetic core 7, and the permanent magnetic core 7 moves up along the inner wall of the photosynthetic reactor body 1. At this time, the wastewater contacts the impeller 8 After that, the impeller 8 is driven to rotate, and the impeller 8 drives the brush 9 to rotate. The brush 9 performs circumferential scrubbing on the inner wall of the photosynthetic reactor body 1 from top to bottom, and the impeller 8 causes the wastewater in the photosynthetic reactor body 1 to form a vortex during the rotation process. Under the action of the vortex, the scraped sludge and algae settle downward, and the conical groove 11 can reduce the sludge and algae from gathering on the upper part of the permanent magnetic core 7; the wastewater passes through the through-hole 10 and acts on the impeller 8 to cause the impeller 8 to rotate; when the permanent magnetic core 7 moves to the top of the photosynthetic reactor body 1, the electromagnet 6 is turned off, and under the action of the deadweight of the permanent magnetic core 7, the permanent magnetic core 7 automatically falls back to the bottom of the photosynthetic reactor body 1, so that the inner wall of the photosynthetic reactor body 1 can be fully cleaned. In the non-use state, the permanent magnetic core 7 is located at the bottom of the photosynthetic reactor body 1 to avoid blocking the irradiation of the light source, and can increase the sedimentation rate of sludge and algae in sewage, thereby improving the sewage discharge efficiency and reducing the replacement amount of wastewater.

[0044] Example 2

[0045] The bacteria-algae symbiotic autotrophic biological phosphorus removal device provided in Example 1 is further optimized. Specifically, Figure 1-3as well as Figure 7 As shown, the bacteria and algae biofilm filler assembly includes a bracket 15 built into the middle of the photosynthetic reactor body 1 and a sponge filler 16 suspended on the bracket 15; the bracket 15 can be rotatably installed at the bottom of the photosynthetic reactor body 1; further, the bracket 15 adopts a stainless steel frame, and the sponge filler 16 adopts a cubic sponge block; the bracket 15 runs through the sponge filler 16; the sponge filler 16 is porous and has strong water absorption, which is conducive to the growth of bacteria and algae.

[0046] In the bacteria-algae symbiotic fully autotrophic biological phosphorus removal device provided in this embodiment, when the wall cleaning operation is carried out in the photosynthetic reactor body 1, the vortex generated by the wastewater will cause an impact on the bacteria and algae on the sponge filler 16, and the hanging rack 15 can rotate synchronously with the vortex in the wastewater, thereby reducing the impact of the vortex on the bacteria and algae on the sponge filler 16 and reducing the amount of bacteria and algae detached from the sponge filler 16; at the same time, the hanging rack 15 can randomly adjust the direction of the sponge after rotation to improve the contact balance between the bacteria and algae and the LED light source 2.

[0047] Specifically, the aeration mechanism includes an aeration pump 13 and a probe-type dissolved oxygen monitor 14, the output end of the aeration pump 13 extends to the bottom of the photosynthetic reactor body 1, and the detection end of the probe-type dissolved oxygen monitor 14 extends into the wastewater in the photosynthetic reactor body 1; further, an aeration component is installed at the bottom of the photosynthetic reactor body 1, the output end of the aeration pump 13 is connected to the aeration component, and the aeration component includes an aeration pipe and an aeration head installed on the aeration pipe; fresh air is blown into the wastewater in the photosynthetic reactor body 1 through the aeration pump 13 and the aeration component to increase the dissolved oxygen content in the wastewater, and the dissolved oxygen content can be monitored in real time through the probe-type dissolved oxygen monitor 14.

[0048] A method for removing phosphorus from bacteria and algae by autotrophic biological dephosphorization during the whole process, using the above-mentioned device for removing phosphorus from bacteria and algae by autotrophic biological dephosphorization during the whole process to treat wastewater, comprising the following steps:

[0049] S1, the photosynthetic reactor body 1 startup stage, inoculate 3-10g / L of autotrophic sludge and 0.2-1.0g / L of Chlorella in the logarithmic growth period, and acclimate until the surface and pores of the sponge filler 16 form a symbiotic biofilm of bacteria and algae;

[0050] S2, the wastewater is pumped into the photosynthetic reactor body 1 through the water inlet pump 3, and a sequencing batch operation process is adopted, including water inlet, aeration, sedimentation and drainage processes. The water inlet and aeration processes are the illumination stage, the LED light source 2 is turned on, the light source intensity is controlled, and the dissolved oxygen concentration of the system is adjusted; the sedimentation and drainage processes are the dark stage, and the light / dark time ratio is controlled to be 12h:12h or 10h:2h or 6h:2h according to the phosphorus removal treatment effect;

[0051] S3, the treated wastewater is discharged through the discharge pipe 4 in the middle of the photosynthetic reactor body 1;

[0052] S4. Repeat S1-S3 to continuously treat the wastewater.

[0053] Specifically, the intensity of the LED light source 2 is 2000-5000 lux;

[0054] Specifically, the dissolved oxygen concentration is controlled at 1-3 mg / L;

[0055] Specifically, the cleaning frequency of the inner wall of the photosynthetic reactor body 1 is once every 10 days, each time for 5 minutes, and the rotation speed of the brush 9 on the impeller 8 is 10-30 rpm.

[0056] The experiment used artificial simulated high ammonia nitrogen wastewater as raw water. The relevant water quality characteristics were: ammonia nitrogen 200±10 mg / L, phosphorus 3.0±0.2 mg / L, and sodium bicarbonate was added to control the inlet pH of the photosynthetic reactor body 1 to be around 7.5.

[0057] More specifically, the experiment was divided into two groups: the experimental group was carried out in a bacteria-algae symbiotic fully autotrophic biological phosphorus removal device, the photosynthetic reactor body 1 was made of a light-transmitting cylindrical material with an effective volume of 4.5 L, wherein the photosynthetic reactor body 1 was equipped with a bacteria-algae biofilm filler component for bacteria-algae biofilm growth, the bacteria-algae biofilm filler component was located below the water level as a whole, the filling rate was 20%, and an LED light source 2 was used to provide illumination; the control group was carried out in a fully autotrophic device without inoculation of microalgae, the fully autotrophic photosynthetic reactor body 1 was made of a light-transmitting cylindrical material with an effective volume of 4.5 L, the photosynthetic reactor body 1 was equipped with a bacteria-algae biofilm filler component for fully autotrophic functional microbial biofilm growth, the bacteria-algae biofilm filler was located below the water level as a whole, the filling rate was 20%.

[0058] The main body 1 of the two groups of photosynthetic reactors were inoculated with 5g / L of autotrophic sludge, and the experimental group was inoculated with 0.5g / L of Chlorella in the logarithmic growth phase. The sequencing batch operation process was adopted, and the main body 1 of the photosynthetic reactor ran one cycle every day, including four stages: water inlet (10min), aeration (710min), sedimentation (710min) and drainage (10min). The experimental group promoted algae photosynthesis oxygen production and assimilation and phosphorus removal by adding LED light source 2 in the water inlet and aeration process to control the light intensity to 3000lux. The sedimentation and drainage process was the dark stage of the experimental group, and the light / dark time ratio was 12h:12h.

[0059] Wastewater enters two groups of photosynthetic reactor bodies 1 through the water inlet pump 3, and contacts the fully autotrophic functional microorganisms formed on the bacteria-algae biofilm filler assembly. Under the condition of appropriate dissolved oxygen concentration, the experimental group uses the synergistic effect of bacteria and microalgae, mainly the assimilation of microalgae to absorb phosphorus in the inlet water of the photosynthetic reactor body 1 to achieve the purpose of phosphorus removal, and the control group uses microbial metabolism to remove phosphorus. The treated wastewater in the two groups of photosynthetic reactor bodies 1 is discharged through the discharge pipe 4 in the middle of the photosynthetic reactor body 1, and the volume exchange ratio is 50%. The photosynthetic reactor body 1 of the experimental group is provided with a wall cleaning mechanism, wherein the speed of the brush 9 on the impeller 8 is 10-30 rpm, and the wall is cleaned once every 10 days, each time for 5 minutes, and the mud / algae is discharged through the sewage pipe 18 at the bottom of the photosynthetic reactor body 1.

[0060] Repeat the above steps to continuously treat the wastewater.

[0061] Table 1 Comparison of treatment effects of two groups of test devices (average values ​​of 5 groups of data)

[0062]

[0063] The experimental results show that after 30 days of operation, the effluent quality reached stability. Compared with the control group, the nitrogen and phosphorus removal effects of the wastewater treated with the bacteria-algae symbiotic full-process autotrophic biological phosphorus removal device were significantly improved. The total nitrogen removal rate of the effluent reached more than 99%, and the total phosphorus removal rate could reach 87.1%.

[0064] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be mechanically connected, electrically connected, or able to communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

Claims

1. A bacteria-algae symbiotic autotrophic biological phosphorus removal device, characterized in that: The invention comprises a photosynthetic reactor body (1), a bacteria-algae biofilm filler component, an aeration mechanism, an LED light source (2), a wall cleaning mechanism and a water inlet pump (3), wherein the photosynthetic reactor body (1) is in the shape of a light-transmitting cylinder, the bacteria-algae biofilm filler component is built into the photosynthetic reactor body (1), the bacteria-algae biofilm filler component is used for bacteria-algae biofilm growth, the LED light source (2) is evenly distributed outside the photosynthetic reactor body (1) in the circumferential direction, the LED light source (2) provides light to promote algae photosynthesis oxygen production and assimilation and phosphorus removal, the wall cleaning mechanism is used for cleaning the inner wall of the photosynthetic reactor body (1), a discharge pipe (4) is provided on one side of the middle part of the photosynthetic reactor body (1), and a first switch valve (5) is installed on the discharge pipe (4); the output end of the water inlet pump (3) extends into the bottom of the photosynthetic reactor body (1); a sewage pipe (17) is provided on one side of the bottom of the photosynthetic reactor body (1), and a second switch valve (18) is installed on the sewage pipe (17).

2. The bacteria-algae symbiotic autotrophic biological phosphorus removal device according to claim 1 is characterized in that: The wall cleaning mechanism comprises two electromagnets (6), a permanent magnetic core (7) slidably mounted in a photosynthetic reactor body (1), an impeller (8) rotatably mounted on the permanent magnetic core (7), and brushes (9) uniformly distributed on the impeller (8) in the circumferential direction; the two electromagnets (6) are mounted on the upper and lower parts of the photosynthetic reactor body (1), respectively, wherein a group of electromagnets (6) at the bottom of the photosynthetic reactor body (1) has the same magnetic pole as the bottom of the permanent magnetic core (7), and a group of electromagnets (6) at the top of the photosynthetic reactor body (1) has the opposite magnetic pole to the top of the permanent magnetic core (7); the outer diameter of the permanent magnetic core (7) matches the inner diameter of the photosynthetic reactor body (1), and a through hole (10) is provided in the middle of the permanent magnetic core (7).

3. The bacteria-algae symbiotic autotrophic biological phosphorus removal device according to claim 2 is characterized in that: The upper portion of the permanent magnetic core (7) is provided with a conical groove portion (11) and a plurality of through openings (12) penetrating upward and downward.

4. The bacteria-algae symbiotic autotrophic biological phosphorus removal device according to claim 1, characterized in that: The aeration mechanism comprises an aeration pump (13) and a probe-type dissolved oxygen monitor (14); the output end of the aeration pump (13) extends into the bottom of the photosynthetic reactor body (1), and the detection end of the probe-type dissolved oxygen monitor (14) extends into the wastewater in the photosynthetic reactor body (1).

5. The bacteria-algae symbiotic autotrophic biological phosphorus removal device according to claim 2, characterized in that: The algae biofilm filler assembly comprises a hanger (15) built into the middle of a photosynthetic reactor body (1) and a sponge filler (16) suspended on the hanger (15); the hanger (15) can be rotatably mounted on the bottom of the photosynthetic reactor body (1).

6. A method for removing phosphorus by autotrophic organisms in a bacterial-algal symbiotic system, characterized in that: The wastewater is treated by using the bacteria-algae symbiotic autotrophic biological phosphorus removal device according to any one of claims 1 to 5, comprising the following steps: S1, the photosynthetic reactor body (1) startup stage, inoculating 3-10 g / L of fully autotrophic sludge and 0.2-1.0 g / L of Chlorella in the logarithmic growth phase, and acclimating until a bacterial-algal symbiotic biofilm is formed on the surface and pores of the sponge filler (16); S2, the wastewater is pumped into the photosynthetic reactor body (1) through the water inlet pump (3), and a sequencing batch operation process is adopted, including water inlet, aeration, sedimentation and drainage processes. The water inlet and aeration processes are the light stage, the LED light source (2) is turned on, the light source intensity is controlled, and the dissolved oxygen concentration of the system is adjusted; the sedimentation and drainage processes are the dark stage, and according to the phosphorus removal treatment effect, the light / dark time ratio is controlled to be 12h:12h or 10h:2h or 6h:2h; S3, the treated wastewater is discharged through the discharge pipe (4) in the middle of the photosynthetic reactor body (1); S4. Repeat S1-S3 to continuously treat the wastewater.

7. The method for dephosphorization by autotrophic bacteria-algae symbiosis according to claim 6, characterized in that: The intensity of the LED light source (2) is 2000-5000 lux.

8. The method for dephosphorization by autotrophic organisms in bacterial-algal symbiosis according to claim 6, characterized in that: The dissolved oxygen concentration is controlled at 1-3 mg / L.

9. The method for dephosphorization by autotrophic bacteria-algae symbiosis according to claim 6, characterized in that: The frequency of cleaning the inner wall of the photosynthetic reactor body (1) is once every 10 days, each time for 5 minutes, and the rotation speed of the brush (9) on the impeller (8) is 10-30 rpm.

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