Bacteria-algae photobiological reaction testing equipment for sewage treatment

Abstract

The present application relates to a kind of bacteria and algae photobiological reaction test equipment for sewage treatment, including sink, tank cover, for being exposed to air to the water tank inside and being exposed to air mechanism, storage bottle, lamp strip, water inlet mechanism, water outlet mechanism, water tank inside is provided with at least three groups of algae adhesion conveying mechanism, algae adhesion conveying mechanism includes two groups of transmission assembly arranged in upper and lower, located between the two groups of transmission assembly and is conveyed, transmission assembly includes two groups of first sprocket located at the both ends of conveying belt, first drive chain, for driving three groups of algae adhesion conveying mechanism synchronous motion drive mechanism.The equipment of the present application covers small area, need not additional heat source, energy consumption is low, energy saving and environmental protection;Can realize the depth removal of carbon, nitrogen and phosphorus in sewage, removal rate is high, and removal effect is good;The purity of the bacteria and algae layer obtained by growth and reproduction is high, and the content of miscellaneous algae is less;The thickness of adhered bacteria and algae layer is large, and uniformity is good, easy to pick, and economic value is large.

Description

Technical Field

[0001] This invention relates to a photobiochemical reaction testing device for bacteria and algae in wastewater treatment, belonging to the technical field of wastewater treatment equipment. Background Technology

[0002] A photobioreactor is a device used for the culture of photosynthetic microorganisms and their photosynthetic tissues or cells. This type of reactor has a similar structure to a conventional bioreactor and, under normal conditions, requires specific light, temperature, and nutrients to cultivate the microorganisms and to regulate and control the system's environment.

[0003] Microalgae photobioreactors are greatly affected by natural environmental factors such as light and temperature during the cultivation process. They are also susceptible to contamination by fungi, protozoa, and other algae species. Furthermore, severe water evaporation and insufficient carbon dioxide supply can lead to low algae cell culture density and high harvesting costs.

[0004] Currently, the use of bacterial and algal biological systems (such as microalgal photobioreactors) utilizes the oxygen released by algal photosynthesis to provide an oxygen source for the growth of aerobic and microaerophilic bacteria, while the CO2 released by bacterial metabolism provides a carbon source for algal photosynthesis. At the same time, the growth of bacteria and algae will ingest a large amount of carbon, nitrogen and phosphorus, thereby achieving deep removal of carbon, nitrogen and phosphorus. This method has the advantages of low energy consumption and low secondary pollution in removing nitrogen and phosphorus from wastewater.

[0005] However, current photobioreactors have poor stability and are difficult to achieve stable and continuous reproduction and growth of bacteria and algae. Even if a structure similar to a belt conveyor is used to solve the problems of hydraulic retention time and reaction time, the algae attached to the belt usually contain a large number of other types of miscellaneous algae, and the purity is generally no more than 50%. This limits its economic viability. Although it has a good effect on wastewater treatment and can reproduce and grow a large number of algae, its economic value is not high and its market motivation is small.

[0006] Based on this, the present invention is proposed. Summary of the Invention

[0007] This invention addresses the shortcomings of existing technologies by providing a wastewater treatment photobioreactor testing device for bacteria and algae, the specific technical solution of which is as follows:

[0008] A wastewater treatment algae photobioreactor testing device includes a water tank, a tank cover installed on the upper end of the water tank, an aeration mechanism for aeration of the water tank, a storage bottle for supplying carbon dioxide to the aeration mechanism, a light strip installed in the water tank, a water inlet mechanism for water intake into the water tank, and a water outlet mechanism for water discharge from the water tank. The water tank is equipped with at least three sets of algae attachment conveying mechanisms. Each algae attachment conveying mechanism includes two sets of conveying components arranged vertically and a conveyor belt located between the two sets of conveying components. Each conveying component includes two sets of first sprockets located at both ends of the conveyor belt, a first transmission chain for matching the two sets of first sprockets, and a drive mechanism for driving the three sets of algae attachment conveying mechanisms to move synchronously. The inner side of the first transmission chain is connected to the outer side of the conveyor belt.

[0009] In a further improvement, the drive mechanism includes a second transmission chain installed between two adjacent sets of algae attachment conveying mechanisms, two sets of second sprockets adapted to the second transmission chain, and a connecting shaft for connecting two sets of first sprockets in the conveying assembly. The connecting shaft is fixedly connected to the two sets of first sprockets in the conveying assembly, and the second sprocket is located outside the first sprocket and is fixedly connected to the connecting shaft. The drive mechanism also includes a motor for driving one of the second sprockets.

[0010] A further improvement involves installing a tensioning mechanism between the two ends of the connecting shaft and the side wall of the water tank. The tensioning mechanism includes a bearing sleeved on the end of the connecting shaft, connecting plates respectively disposed on both sides of the bearing, and an adjusting mechanism for adjusting the vertical position of one of the bearings. The adjusting mechanism includes a vertically arranged first bolt, a collar for limiting the vertical movement of the first bolt, and a nut adapted to the first bolt. The side wall of the water tank is provided with a first limiting groove for the vertical movement of the end of the connecting shaft, and second limiting grooves are respectively provided on both sides of the first limiting groove, parallel to the first limiting groove. The water tank has a limiting groove, a second bolt at the second limiting groove, an inner plate inside the water tank, a first mounting hole in the center of the inner plate for the end of the connecting shaft to move, and a threaded hole on the edge of the inner plate that matches the second bolt. The end of the connecting shaft passes through the first mounting hole and the side wall of the water tank and connects to the bearing. The connecting plate is fixedly connected to the outer ring of the bearing. The second bolt passes through the connecting plate, passes through the second limiting groove, and is threadedly connected to the threaded hole. The end of the first bolt passes through a collar and contacts the outer ring of the bearing. The collar is fixedly connected to the side wall of the water tank. The nut is threadedly connected to the first bolt.

[0011] In a further improvement, the inner side of the first transmission chain is provided with multiple connecting pieces, which are fixedly connected to the links of the first transmission chain, and the end of the conveyor belt is fixedly connected to the connecting pieces by mounting screws.

[0012] In a further improvement, the aeration mechanism includes a first air pipe connected to the storage bottle, two axially symmetrically arranged annular rhythmic pipes, an annular oscillating pipe, a fixing block for fixing the two annular rhythmic pipes and the annular oscillating pipe, and two bolt connectors for fixing the fixing block to the bottom of the water tank. The sidewalls of both the annular rhythmic pipes and the annular oscillating pipes are provided with several air holes. The annular rhythmic pipe includes a straight rubber pipe, a semi-elliptical bent rubber pipe, and a curved pipe. One end of the bent rubber pipe is connected to the straight rubber pipe, and the other end of the bent rubber pipe is connected to the tail end of the curved pipe. A transition pipe is connected to the beginning of the two curved pipes. Both straight rubber pipes are connected to the first air pipe. The annular oscillating pipe includes two inclined rubber pipes and an arc-shaped pipe for connecting the two inclined rubber pipes. The included angle between the two inclined rubber pipes is 20° to 36°. The inclined rubber pipes are connected to the straight rubber pipes. One bolt connector is located outside the transition pipe, and the other bolt connector is located at the junction between the two inclined rubber pipes.

[0013] In a further improvement, the rubber straight tube, rubber curved tube, curved tube, transition tube, rubber inclined tube, and arc tube are all made of nitrile rubber. The side wall of the rubber straight tube is provided with a spiral hardening ring one, and the side wall of the rubber inclined tube is provided with a circular hardening ring two arranged at equal intervals. Both the hardening ring one and the hardening ring two are hardened by a secondary vulcanization process.

[0014] In a further improvement, the bottom of the water tank is equipped with casters and a micro-tapping mechanism. The micro-tapping mechanism corresponds one-to-one with the algae attachment and conveying mechanism and is located directly below the algae attachment and conveying mechanism. The micro-tapping mechanism includes an aluminum tank installed at the bottom of the water tank, an electromagnet installed at the bottom of the aluminum tank, and a tapping element located above the electromagnet. The aluminum tank and the bottom of the water tank form a tapping cavity for the tapping element to move in. The tapping element includes a spherical permanent magnet and a conical shell. The large end of the conical shell is fixedly connected to the diameter end of the permanent magnet. The conical shell is made of aluminum alloy, and the tip of the conical shell is provided with a rounded part. A lead ball moving chamber is formed between the conical shell and the diameter end of the permanent magnet, and a lead ball is placed in the lead ball moving chamber.

[0015] A further improvement is made to the method of manufacturing the conveyor belt as follows:

[0016] Polypropylene filter cloth and epoxy resin semi-cured sheet were hot-pressed at 15 MPa for more than 1 hour at a hot-pressing temperature of 160℃. After the flow rate of epoxy resin semi-cured sheet was greater than or equal to 67%, the mixture was cooled and immersed in 1.3% hydrofluoric acid for 17 minutes. The frequency used during the immersion process was 21 kHz.

[0017] The epoxy resin semi-cured sheet is obtained by impregnating 1080 type glass fiber cloth with epoxy resin adhesive and then baking it in an oven at 150℃ for 250-300 seconds.

[0018] In a further improvement, a pressure reducing valve, a buffer tank, and a solenoid valve are sequentially installed between the storage bottle and the first gas tube. By controlling the opening and closing of the solenoid valve, carbon dioxide is intermittently ejected from the gas hole.

[0019] A further improvement is that the electromagnet generates a magnetic force that repels the permanent magnet when energized, allowing for intermittent energization of the electromagnet; the magnitude of the current applied when energizing the electromagnet varies in a pulsed manner; and the conveyor belt surface is coated with a layer of bacteria and algae.

[0020] When the algae in the algal layer are Haematococcus pluvialis, the maximum amplitude produced by the tapping of the tapper on the bottom of the tank is 3.1 mm, and the total tapping time per day is 3 to 3.5 hours.

[0021] When the algae in the algal layer are Scenedesmus obliquus, the maximum amplitude produced by the tapping of the tapping tool on the bottom of the tank is 5.7 mm, and the total tapping time per day is 1 to 1.2 hours.

[0022] When the algae in the algae layer is Spirulina, the maximum amplitude produced by the tapping of the tapper on the bottom of the tank is 4.3 mm, and the total tapping time per day is 5 to 6 hours.

[0023] The beneficial effects of this invention are:

[0024] 1. The wastewater treatment photobioreactor testing equipment for bacteria and algae has a small footprint, requires no additional heat source, has low energy consumption, and is energy-saving and environmentally friendly.

[0025] 2. By utilizing the photosynthesis of algae and the synergistic effect of aerobic and microaerophilic bacteria, deep removal of carbon, nitrogen, and phosphorus in wastewater can be achieved, with advantages such as high removal rate, good removal effect, and low secondary pollution.

[0026] 3. The bacterial and algal layer obtained by the growth and reproduction of this invention has high purity (over 90%) and low content of impurities; at the same time, after one cycle, the attached bacterial and algal layer is thick, uniform, easy to harvest, and has great economic value. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the wastewater treatment bacterial and algal photobiochemical reaction testing equipment described in this invention;

[0028] Figure 2 This is a schematic diagram of the structure of the inner plate described in this invention;

[0029] Figure 3 This is a schematic diagram of the structure of the three sets of algae attachment and conveying mechanisms described in this invention;

[0030] Figure 4 This is a schematic diagram of the installation of the conveyor belt and the first transmission chain according to the present invention;

[0031] Figure 5 This is a schematic diagram showing the distribution of the aeration mechanism described in this invention within the water tank;

[0032] Figure 6 This is a schematic diagram of the aeration mechanism described in this invention;

[0033] Figure 7 This is a schematic diagram showing the connection of the annular rhythmic tube and the annular oscillating tube described in this invention;

[0034] Figure 8 This is a schematic diagram of the micro-tapping mechanism described in this invention;

[0035] Figure 9 The image shown is a photograph of the wastewater treatment photobioreactor testing equipment for bacteria and algae described in this invention.

[0036] Figure 10 This is a physical diagram of the internal structure of the wastewater treatment photobioreactor testing equipment for bacteria and algae as described in this invention;

[0037] Figure 11 This is a photograph of the aeration mechanism described in this invention distributed within a water tank. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0039] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Example 1

[0042] like Figure 1 , 2 As shown in Figures 3, 9, and 10, the wastewater treatment algae photobioreactor testing equipment includes a water tank 10, a tank cover 11 installed on the upper end of the water tank 10, an aeration mechanism 70 for aeration of the water tank 10, a storage bottle for providing carbon dioxide to the aeration mechanism 70, a light strip 6 installed in the water tank 10, a water inlet mechanism for water entering the water tank 10, and a water outlet mechanism for water exiting the water tank 10. The water tank 10 is equipped with at least three sets of algae attachment conveying mechanisms. Each algae attachment conveying mechanism includes two sets of conveying components 30 arranged vertically and a conveyor belt 60 located between the two sets of conveying components 30. Each conveying component 30 includes two sets of first sprockets 51 located at both ends of the conveyor belt 60, a first transmission chain 53 for matching the two sets of first sprockets 51, and a drive mechanism for driving the three sets of algae attachment conveying mechanisms to move synchronously. The inner side of the first transmission chain 53 is connected to the outer side of the conveyor belt 60.

[0043] First, wastewater enters the water tank 10 through the water inlet mechanism. In each group of algae attachment conveying mechanisms, the three groups of algae attachment conveying mechanisms are driven by the drive mechanism to move synchronously, thereby driving the conveyor belt 60 to rotate in a cycle.

[0044] Since there are bacteria and algae in the water tank 10, the light strip 6 is the light source, and the carbon dioxide in the storage bottle is continuously aerated into the water tank 10 through the aeration mechanism 70, thereby providing an environment for algae to carry out photosynthesis. With the conveyor belt 60 as a carrier, a large number of bacteria and algae attach to the surface of the conveyor belt 60, thereby forming a bacterial and algae layer.

[0045] The photosynthesis of bacteria and algae, and the photosynthetic efficiency of carbon dioxide as a carbon source in water, can more effectively prevent the COD of the effluent from exceeding the standard.

[0046] The rotation of the conveyor belt 60 causes the algae and bacteria layer attached to the conveyor belt 60 to be alternately immersed in water and air. When immersed in water, aerobic and microaerophilic bacteria consume oxygen to degrade organic matter, proliferate, and produce carbon dioxide; simultaneously, the algae and bacteria layer adsorbs / absorbs nutrients such as nitrogen and phosphorus from the water. As the algae and bacteria layer rotates with the conveyor belt 60, algae photosynthesize and absorb nitrogen and phosphorus for growth, while the oxygen released by algae photosynthesis provides an oxygen source for the growth of aerobic and microaerophilic bacteria, and the carbon dioxide released by bacterial metabolism provides a carbon source for algae photosynthesis. The growth and proliferation processes of bacteria and algae are synergistic, effectively reducing additional energy and fuel consumption, and the entire system requires no additional heating. No membrane filtration is needed; the algae's purification effect can purify the water. The purified water is discharged through an outlet mechanism. Preferably, the outlet is located at the upper part of the water tank 10, and the lower part of the water tank 10 is also preferred.

[0047] Example 2

[0048] like Figures 1-4 As shown, based on Embodiment 1, the driving mechanism includes a second transmission chain 57 installed between two adjacent sets of algae attachment conveying mechanisms, two sets of second sprockets 55 adapted to the second transmission chain 57, and a connecting shaft 52 for connecting two sets of first sprockets 51 in the conveying assembly 30. The connecting shaft 52 is fixedly connected to the two sets of first sprockets 51 in the conveying assembly 30, and the second sprocket 55 is located outside the first sprocket 51 and is fixedly connected to the connecting shaft 52. The driving mechanism also includes a motor for driving one of the second sprockets 55.

[0049] First, the motor drives one of the second sprockets 55 to rotate, which in turn drives the corresponding first sprocket 51 to rotate, thus driving the first transmission chain 53 to rotate, which in turn drives the conveyor belt 60 to rotate in a cycle.

[0050] The independent circulation and synchronous rotation of the conveyor belts 60 are achieved by rotating the second sprocket 55 and the second transmission chain 57.

[0051] Example 3

[0052] Based on Example 1, such as Figure 1 , 2As shown, a tensioning mechanism is installed between the two ends of the connecting shaft 52 and the side wall of the water tank 10. The tensioning mechanism includes a bearing 31 sleeved on the end of the connecting shaft 52 and connecting plates 32 respectively disposed on both sides of the bearing 31. The tensioning mechanism also includes an adjustment mechanism for adjusting the vertical position of one of the bearings 31. The adjustment mechanism includes a vertically arranged first bolt 21, a collar 22 for limiting the vertical movement of the first bolt 21, and a nut 23 adapted to the first bolt 21. The side wall of the water tank 10 is provided with a first limiting groove 12 for the vertical movement of the end of the connecting shaft 52. A second limiting groove 13 is provided on both sides of the first limiting groove 12, which is parallel to the first limiting groove 12. A second bolt 34 is provided at the location. An inner plate 33 is provided inside the water tank 10. A first mounting hole 331 for the end of the connecting shaft 52 to move is provided in the center of the inner plate 33. A screw hole 332 adapted to the second bolt 34 is provided on the edge of the inner plate 33. The end of the connecting shaft 52 passes through the first mounting hole 331 and the side wall of the water tank 10 and is connected to the bearing 31. The connecting plate 32 is fixedly connected to the outer ring of the bearing 31. The second bolt 34 passes through the connecting plate 32 and passes through the second limiting groove 13 and is threadedly connected to the screw hole 332. The end of the first bolt 21 passes through the collar 22 and contacts the outer ring of the bearing 31. The collar 22 is fixedly connected to the side wall of the water tank 10. The nut 23 is threadedly connected to the first bolt 21.

[0053] Because a chain or belt transmission is used, tautness must be maintained. In this invention, a tensioning mechanism is used for adjustment. By first loosening the nut 23, then tightening the first bolt 21 to lift it upwards or cause the bearing 31 to fall downwards, the tension of the first transmission chain 53 is effectively adjusted. Finally, the nut 23 is tightened. The second bolt 34 and the inner plate 33 are used to improve stability. The tensioning mechanism described in this invention ensures the taut state of the conveyor belt 60 and prevents slackness caused by deformation or structural loosening of the conveyor belt 60.

[0054] Example 4

[0055] Based on Example 1, such as Figure 4 As shown, a plurality of connecting pieces 58 are provided on the inner side of the first transmission chain 53. The connecting pieces 58 are fixedly connected to the links of the first transmission chain 53. The first transmission chain 53 is composed of a plurality of links connected in series. The end of the conveyor belt 60 is fixedly connected to the connecting pieces 58 by mounting screws 54.

[0056] The method described in this embodiment has a simple structure, good synchronization between the conveyor belt 60 and the first transmission chain 53, no need to add additional pulleys, and the tension remains very uniform throughout the process, which is conducive to the adhesion of bacteria and algae.

[0057] Example 5

[0058] like Figure 5 , 6 As shown in Figures 7 and 11, the aeration mechanism 70 includes a first air pipe 71 connected to the storage bottle, two annular rhythmic pipes 72 arranged symmetrically on an axis, an annular swing pipe 73, a fixing block 74 for fixing the two annular rhythmic pipes 72 and the annular swing pipe 73, and two bolt connectors 75 for fixing the fixing block 74 to the bottom of the water tank 10. The side walls of the annular rhythmic pipes 72 and the annular swing pipe 73 are provided with several air holes. The annular rhythmic pipe 72 includes a straight rubber pipe 721, a semi-elliptical bent rubber pipe 722, and a curved pipe 723. One end of the bent rubber pipe 722 is connected to the straight rubber pipe 721. 1. The other end of the rubber curved tube 722 is connected to the tail end of the curved tube 723. The first ends of the two curved tubes 723 are connected to the transition tube 724. Both rubber straight tubes 721 are connected to the first air tube 71. The annular swing tube 73 includes two rubber inclined tubes 731 and an arc tube 732 for connecting the two rubber inclined tubes 731. The included angle between the two rubber inclined tubes 731 is 20° to 36°. The rubber inclined tubes 731 are connected to the rubber straight tubes 721. One bolt connector 75 is located outside the transition tube 724, and the other bolt connector 75 is located at the junction between the two rubber inclined tubes 731.

[0059] In this example, a semi-ellipse refers to a structure formed by cutting half of an ellipse along the directions of its major and minor axes.

[0060] The rubber straight tube 721, rubber bent tube 722, curved tube 723, transition tube 724, rubber inclined tube 731, and arc tube 732 are all made of nitrile rubber. The side wall of the rubber straight tube 721 is provided with a spiral hardening ring one, and the side wall of the rubber inclined tube 731 is provided with a circular hardening ring two arranged at equal intervals. Both the hardening ring one and the hardening ring two are hardened by a secondary vulcanization process.

[0061] A pressure reducing valve, a buffer tank, and a solenoid valve are sequentially arranged between the storage bottle and the first gas pipe 71. By controlling the opening and closing of the solenoid valve, carbon dioxide is intermittently ejected from the gas hole.

[0062] In this example, the intermittent operation refers to, taking a solenoid valve as an example, opening for 3 seconds and closing for 1 second to cut off the gas supply; this cycle continues.

[0063] Because of the intermittent jetting, it generates pulse force. Combined with the elasticity of the rubber itself, the annular rhythmic tube 72 and the annular oscillating tube 73 continuously rhythmize and oscillate while jetting, thus achieving a "stirring" effect on the bottom of the water tank 10. This effectively prevents the accumulation of large amounts of algae and sludge at the bottom of the water tank 10, and also prevents algae and sludge from forming films and clumps.

[0064] In addition, the "stirring" effect makes it easier for algae inside and outside the bottom of the conveyor belt 60 to exchange, thereby making the attached algae and bacteria layer more evenly distributed and helping to improve nitrogen and phosphorus removal efficiency.

[0065] Test on the formation of anti-algae mud layer in aeration mechanisms

[0066] Wastewater treatment algae photobioreactor testing equipment, with a treatment capacity of 30 tons / day, takes the aeration unit as the circle and the surrounding 70cm area as the area, continuously treats water for 30 days, observes the algae sludge layer in this area and measures its thickness.

[0067] Group 1, this embodiment includes an aeration mechanism 70 comprising an annular rhythmic tube 72 and an annular oscillating tube 73. Tests were conducted according to the "Test for Algae-Preventing Mud Layer Formation in Aeration Mechanisms," and no continuous algae mud layer was found; the maximum area of ​​the algae mud layer was 7 cm². 2 They are all regional algae mud blocks, with a maximum thickness of no more than 1.3 mm.

[0068] Group 2: For comparison, in this group, if the rubber bending tube 722 has an arc-shaped structure, the rest is the same as Group 1. Tests were conducted according to the "Test Experiment on the Formation of Algae-resistant Mud Layer in Aeration Mechanisms," and no continuous algae mud layer was found; however, a large number of algae mud layers with an area of ​​13–21 cm² were observed. 2 The algae mud layer has a maximum thickness of 2.1 mm.

[0069] Because the rubber bending tube 722 has an arc-shaped structure, its bending effect is not as good as that of a semi-elliptical tube. This will cause the rhythmic effect of the bending tube 723 to be significantly worse under the action of pulse force.

[0070] Group 3: For comparison, in this group, if the circular arc tube 732 is replaced with a semi-elliptical tube, the rest is the same as in Group 1. Tests were conducted according to the "Test Experiment on the Formation of Algae-Preventing Mud Layer in Aeration Mechanisms." No continuous algae mud layers were found, but some unevenly thick layers with areas ranging from 17 to 33 cm² were observed. 2 The algal mud layer (accounting for no more than 25%) has a thickness of 1–3.7 mm.

[0071] If the arc tube 732 is replaced with a semi-elliptical tube, although it makes it easier for the two rubber inclined tubes 731 to contract freely inward, its effect on the swing of the entire rubber inclined tube 731 is not significant. This is because the sidewall of the rubber inclined tube 731 has equally spaced annular hardened rings, making it easier to swing left and right with large amplitude, thus preventing the algae mud layer from forming patches. Therefore, using a semi-elliptical tube that is easier to contract inward will affect the maximum scanning range of the annular swing tube 73.

[0072] Group 4: For comparison, in this group, if two annular rhythmic tubes 72 are used instead of the annular oscillating tube 73, the rest is the same as in Group 1. Tests were conducted according to the "Test Experiment on the Formation of Algae-Preventing Mud Layer in Aeration Mechanisms." No continuous algae mud layers were found, but some layers with a thickness exceeding 11 mm but an area not exceeding 10 cm² were observed. 2 The algal mud layer.

[0073] Because the annular oscillating tube 73 mainly oscillates left and right, while the two annular rhythmic tubes 72 rhythmize on the other side, it can clean up algae and silt in the area without leaving any blind spots.

[0074] Group 5: For comparison, in this group, if the annular oscillating tube 73 is used instead of the annular rhythmic tube 72, the rest is the same as in Group 1. Tests were conducted according to the "Test Test for Algae-Preventing Mud Layer Formation in Aeration Mechanisms," and no continuous algae mud layer was found; the maximum area of ​​the algae mud layer was 7 cm². 2 They are all regional algae mud blocks, with a maximum thickness of no more than 1.4 mm.

[0075] However, according to the "Test for Purity of Algal Layer" and "Test for Uniformity of Algal Layer", taking Scenedesmus obliquus as an example, its purity is 79% and the deviation value is ≥9mm.

[0076] In Group 1, the purity of the algal layer and the uniformity of the algal layer were tested according to the "Bacterial and Algal Layer Purity Test" and the "Bacterial and Algal Layer Uniformity Test". Taking Scenedesmus obliquus as an example, its purity reached 94% and the deviation value was ≤2mm.

[0077] Test for Purity of Algal Layer

[0078] Random samples were taken from the algae and bacteria layer adhering to the inner and outer surfaces of the conveyor belt 60, with 200 sampling points. The sampled algae were observed under a microscope to determine whether they were target algae. Taking Scenedesmus obliquus as an example, which is a target algae, in one experiment, 188 samples of target algae and 12 samples of non-target algae (miscellaneous algae) were found, with a purity of 94%.

[0079] Test for uniformity of algal and bacterial layers

[0080] Random samples were taken from the algae and bacteria layer adhering to the inner and outer surfaces of the conveyor belt 60, with 50 sampling points. The thickness of the samples was measured. It should be noted that before thickness measurement, the surface mud needs to be washed away, and only the thickness of the "film block" is measured. The average thickness of all samples was calculated, and then the deviation between the maximum thickness and the average value was calculated. This deviation value was used to measure the uniformity of the algae and bacteria layer.

[0081] Group 6: For comparison, in this group, if the sidewall of the rubber straight tube 721 is provided with hardened rings arranged at equal intervals, the rest is the same as in Group 1. The purity of the algal layer was tested according to the "Algal Layer Purity Test" and the "Algal Layer Uniformity Test". Taking *Scenedesmus obliquus* as an example, its purity was 72%, and the deviation value was ≥11mm.

[0082] The hardened ring on the side wall of the rubber straight tube 721 must be spiral. If it is an equally spaced ring, the entire rubber straight tube 721 will not be able to move and lift when subjected to pulse impact force, thus failing to effectively promote the growth, reproduction and accumulation of bacteria and algae inside the conveyor belt 60 in the initial stage.

[0083] Group 7: For comparison, in this group, if the hardened ring 2 on the side wall of the rubber inclined tube 731 is spiral, the rest is the same as in Group 1. Tests were conducted according to the "Test Experiment on the Formation of Algae-resistant Mud Layer in Aeration Mechanisms," and it was found that the maximum thickness of the continuous algae mud layer exceeded 3.9 mm.

[0084] In this group, the annular oscillating tube formed by the rubber inclined tube will also exhibit a "rhythmic" tilting, which significantly reduces the oscillation and cleaning functions of the entire aeration mechanism, ultimately resulting in the formation of a large amount of algae mud layer at the bottom of the tank.

[0085] It should be noted that, in this invention, although the annular rhythmic tube 72 mainly moves in a "rhythmic" upward motion, it also occasionally oscillates slightly.

[0086] Example 6

[0087] like Figure 1 , 8 As shown, the bottom of the water tank 10 is equipped with casters 40, and the bottom of the water tank 10 is also equipped with a micro-tapping mechanism. The micro-tapping mechanism corresponds one-to-one with the algae attachment and conveying mechanism and is located directly below the algae attachment and conveying mechanism. The micro-tapping mechanism includes an aluminum trough 81 installed at the bottom of the water tank 10, an electromagnet 82 installed at the bottom of the aluminum trough 81, and a tapping element located above the electromagnet 82. The aluminum trough 81 and the bottom of the water tank 10 form a tapping cavity 84 for the tapping element to move. The tapping element includes a spherical permanent magnet 83 and a conical shell 85. The large end of the conical shell 85 is fixedly connected to the diameter end of the permanent magnet 83. The conical shell 85 is made of aluminum alloy, and the tip of the conical shell 85 is provided with a rounded part 86. A lead ball moving chamber 88 is formed between the conical shell 85 and the diameter end of the permanent magnet 83. A lead ball 87 is placed in the lead ball moving chamber 88.

[0088] When the electromagnet 82 is energized, it generates a magnetic force that repels the permanent magnet 83, and the electromagnet 82 is energized intermittently; when the electromagnet 82 is energized, the magnitude of the current changes in a pulse manner.

[0089] The 40 casters serve two purposes: firstly, they facilitate movement; secondly, they provide space for installing the micro-tapping mechanism.

[0090] A pulse is a waveform change in amplitude that rapidly varies from a baseline value to a higher or lower value. Intermittent refers to working for a period of time, then pausing for a period of time; and repeating this cycle.

[0091] The working principle of the micro-tapping mechanism is as follows:

[0092] When electromagnet 82 is energized, it generates a magnetic force that repels permanent magnet 83, causing permanent magnet 83 to move upwards. This causes the striking piece to produce a micro-tapping effect on the bottom of water tank 10. When the power is turned off, the striking piece falls to the bottom of aluminum tank 81 under the combined effects of gravity and magnetic attraction. This cycle repeats when the power is turned on again. The special structure of the striking piece itself, especially the structure of the conical shell 85 and permanent magnet 83, ensures that even if the striking piece flips inside the striking chamber 84, it will still fall onto electromagnet 82 with permanent magnet 83. This guarantees that each time the striking piece moves upwards, it can produce a micro-tapping effect on the bottom of water tank 10. In addition, the lead ball 87 further enhances the micro-tapping effect. Because the goal is not to maximize amplitude, the lead ball 87 continuously impacts itself twice within the lead ball movement chamber 88, generating a large number of micro-taps.

[0093] In this invention, due to the use of a micro-tapping mechanism, when propagating and growing algae of a certain species, such as Haematococcus pluvialis, if the micro-tapping mechanism is not activated, the purity of the algal layer attached to the surface of the conveyor belt 60 will be ≤63%, and the effective thickness of the algal layer will be ≤0.9cm. The effective thickness is tested according to the "Effective Thickness Test".

[0094] Effective Thickness Test

[0095] Take a sample of the algae and bacteria layer attached to the surface of the conveyor belt 60, dry it to a moisture content of 50%, and weigh it as m1; then put it into an ultrasonic cleaning tank for cleaning for no less than 10 minutes (ultrasonic frequency of 20kHz), dry it to a moisture content of 50%, and weigh it as m2; weight loss rate = (m1-m2) / m1.

[0096] If the weight loss rate reaches 50% within 30 minutes of cleaning in the ultrasonic cleaning tank, the thickness of the bacterial and algal layer in the last sample is measured, and this thickness is the effective thickness.

[0097] If the cleaning time in the ultrasonic cleaning tank exceeds 50 minutes and the weight loss rate is still within 50%, measure the thickness of the bacterial and algal layer in the last sample; this thickness is the effective thickness.

[0098] In this invention, if the micro-tapping mechanism is activated, when the algae in the algae layer is Haematococcus pluvialis, the maximum amplitude generated by the tapping of the tapper on the bottom of the water tank 10 is 3.1 mm, and the total tapping time per day is 3 to 3.5 hours; finally, the algae layer attached to the surface of the conveyor belt 60 has a purity of ≥94% and an effective thickness of ≥3.1 cm.

[0099] When the algae in the algae layer is Scenedesmus obliquus, the maximum amplitude generated by the tapping of the tapper on the bottom of the water tank 10 is 5.7 mm, and the total tapping time per day is 1 to 1.2 hours; the algae layer attached to the surface of the conveyor belt 60 has a purity of ≥95% and an effective thickness of ≥2.7 cm.

[0100] When the algae in the algae layer is spirulina, the maximum amplitude generated by the tapping of the tapper on the bottom of the water tank 10 is 4.3 mm, and the total tapping time per day is 5 to 6 hours; finally, the algae layer attached to the surface of the conveyor belt 60 has a purity of ≥91% and an effective thickness of ≥3 cm.

[0101] Group 8. As a comparison, in this group, if the algae in the algal layer is Scenedesmus obliquus, the maximum amplitude produced by the tapping of the tapper on the bottom of the water tank 10 is 3.1 mm, and the total tapping time per day is 3.5 h; the final algal layer attached to the surface of the conveyor belt 60 has a purity of 89% and an effective thickness of 1.8 cm.

[0102] Group 9. For comparison, in this group, if the algae in the algae layer is spirulina, the maximum amplitude produced by the tapping of the tapper on the bottom of the water tank 10 is 3.1 mm, and the total tapping time per day is 3.5 h; the final algae layer attached to the surface of the conveyor belt 60 has a purity of 78% and an effective thickness of 1.3 cm.

[0103] Because different algae require different tapping durations and intensities (amplitudes), the resulting impact effects are different. During the continuous rotation of the conveyor belt 60, other algae besides the main species can be "separated," making it difficult for them to adhere to the surface of the conveyor belt 60. Even if they do adhere, they are shaken off by the micro-tapping.

[0104] Group 10: As a comparison, in this group, when the algae in the algal layer is Haematococcus pluvialis, the maximum amplitude produced by the tapping of the tapper on the bottom of the water tank 10 is 10 mm, and the total tapping time per day is 1 hour; the effective thickness of the algal layer attached to the surface of the conveyor belt 60 is ≤0.7 cm.

[0105] Therefore, it can be seen that when the striking force is too great, it will be difficult for a large amount of bacteria and algae to adhere to the surface of the conveyor belt 60.

[0106] Example 7

[0107] The method for manufacturing the conveyor belt 60 is as follows:

[0108] Polypropylene filter cloth and epoxy resin semi-cured sheet were hot-pressed at 15 MPa for more than 1 hour at a hot-pressing temperature of 160℃. After the flow rate of epoxy resin semi-cured sheet was greater than or equal to 67%, the mixture was cooled and immersed in 1.3% hydrofluoric acid for 17 minutes. The frequency used during the immersion process was 21 kHz.

[0109] The epoxy resin semi-cured sheet is obtained by impregnating 1080 type glass fiber cloth with epoxy resin and then baking it in an oven at 150℃ for 250-300 seconds. The thickness of the conveyor belt 60 is 5mm, of which the thickness of the polypropylene filter cloth is 2mm and the thickness of the epoxy resin cured sheet is 3mm.

[0110] The epoxy resin adhesive is a conventional formula, using the proportions recommended in the manufacturer's instructions. For example, it uses 100kg of Yangnong Jinhu Chemical's basic liquid epoxy resin YN1828, 2.1kg of dicyandiamide as the curing agent, 0.3kg of imidazole as the accelerator, and 60kg of dimethylformamide as the solvent.

[0111] First, the epoxy resin prepreg is subjected to excessive hot pressing, causing excessive resin flow, thus ensuring the final epoxy resin prepreg is completely cured into a cured epoxy resin sheet. The pore size on the surface of the cured epoxy resin sheet generally does not exceed 1mm. In use, the conveyor belt 60 consists of the cured epoxy resin sheet as the inner layer and the polypropylene filter cloth as the outer layer. Using the epoxy resin prepreg for hot pressing allows the final cured epoxy resin sheet and polypropylene filter cloth to be bonded together, achieving high strength through the excessive hot pressing process. It also results in a microporous structure on the surface of the cured epoxy resin sheet, making the conveyor belt 60 essentially a "filter cloth," primarily maintaining the permeability between the inside and outside of the conveyor belt 60.

[0112] Taking Spirulina as an example, the original total thickness of the bacterial and algal layer attached to the inner surface of the conveyor belt 60 of the present invention can exceed 6cm, and no large-area shedding occurs during the rotation of the conveyor belt 60.

[0113] If 7628 or 2116 type fiberglass cloth is used for hot pressing, excessive glue flow cannot be avoided to ensure connection strength. As a result, the surface of the epoxy resin cured sheet has fewer pores, and the pore size is generally no more than 0.3mm; resulting in poor water permeability.

[0114] The hydrofluoric acid immersion is mainly used to corrode the fiberglass cloth. Since there are some small pores on the surface of the final epoxy resin cured sheet, the corrosion can further expand the pores, and finally there are some micropores of 1.5-2mm on the surface, which meets the requirements of water permeability and the adhesion of bacteria and algae.

[0115] If polypropylene filter cloth and nylon filter cloth are "composite", firstly, current technology cannot combine them into one piece by hot pressing and ensure the water permeability and flexibility of the final composite layer. It can only be done by sewing. However, the conveyor belt obtained by this method is prone to blistering, and the attached bacteria and algae layer is prone to falling off during the circulating rotation.

[0116] Similarly, even polyester filter cloth, polypropylene filter cloth, and nylon filter cloth cannot be combined in pairs. Even if adhesives are used in the middle, they can easily block the micropores on the surface of the filter cloth, resulting in poor water permeability.

[0117] If the epoxy resin prepreg is not excessively hot-pressed, and the polypropylene filter cloth and epoxy resin prepreg are hot-pressed at 12MPa for more than 40 minutes at a hot-pressing temperature of 160℃, and the flow rate of the epoxy resin prepreg is less than or equal to 52%, then cooled, it is immersed in 1.3% hydrofluoric acid for 17 minutes at a frequency of 21kHz. In this way, the epoxy resin prepreg is completely cured into an epoxy resin cured sheet with no micropores on the surface. Even with hydrofluoric acid, it cannot corrode the fiberglass cloth. The resulting conveyor belt, taking spirulina as an example, has an original total thickness of algae layer attached to the inner surface of the conveyor belt of no more than 2.2cm, and a large area of ​​algae layer will fall off during the rotation of the conveyor belt at 60°.

[0118] If the conveyor belt uses a 5mm thick polypropylene filter cloth, taking spirulina as an example, the original total thickness of the bacteria and algae layer attached to the inner surface of the conveyor belt will not exceed 3cm, and during the rotation of the conveyor belt at 60°, the bacteria and algae layer in some areas will fall off.

[0119] Due to slight differences in the impact force and algae growth environment experienced by the inner and outer layers of the conveyor belt 60, the adhesion difficulty and adhesion effect of the attached bacteria and algae layer differ from those of the inner and outer layers of the conveyor belt 60. Therefore, filter cloths made of the same material cannot be used.

[0120] In the above embodiments, the wastewater treatment photobioreactor testing equipment for bacteria and algae can operate continuously and stably. The bacteria and algae layer can efficiently adsorb / absorb nutrients such as nitrogen and phosphorus in wastewater, thereby purifying the water.

[0121] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wastewater treatment algal photobioreactor testing device, comprising a water tank (10), a tank cover (11) installed on the upper end of the water tank (10), an aeration mechanism (70) for aeration of the water tank (10), a storage bottle for supplying carbon dioxide to the aeration mechanism (70), a light strip (6) installed in the water tank (10), a water inlet mechanism for water intake into the water tank (10), and a water outlet mechanism for water discharge from the water tank (10), wherein the water tank (10) is provided with at least three sets of algae attachment and conveying mechanisms, characterized in that: The algae attachment conveying mechanism includes two sets of conveying components (30) arranged vertically and vertically, and a conveyor belt (60) located between the two sets of conveying components (30). The conveying component (30) includes two sets of first sprockets (51) located at both ends of the conveyor belt (60), a first transmission chain (53) for matching the two sets of first sprockets (51), and a drive mechanism for driving the three sets of algae attachment conveying mechanisms to move synchronously. The inner side of the first transmission chain (53) is connected to the outer side of the conveyor belt (60). The aeration mechanism (70) includes a first air pipe (71) connected to the storage bottle, two axially symmetrically arranged annular rhythmic pipes (72), an annular swing pipe (73), a fixing block (74) for fixing the two annular rhythmic pipes (72) and the annular swing pipe (73), and two bolt connectors (75) for fixing the fixing block (74) to the bottom of the water tank (10). The side walls of the annular rhythmic pipes (72) and the annular swing pipes (73) are provided with several air holes. The annular rhythmic pipe (72) includes a rubber straight pipe (721), a semi-elliptical rubber curved pipe (722), and a curved pipe (723). One end of the rubber curved pipe (722) is connected to the rubber straight pipe (721). The other end of the rubber curved tube (722) is connected to the tail end of the curved tube (723), and the two curved tubes (723) are connected to the head end of the transition tube (724). The two rubber straight tubes (721) are connected to the first air tube (71). The annular swing tube (73) includes two rubber inclined tubes (731) and an arc tube (732) for connecting the two rubber inclined tubes (731). The included angle between the two rubber inclined tubes (731) is 20° to 36°. The rubber inclined tubes (731) are connected to the rubber straight tubes (721). One bolt connector (75) is located outside the transition tube (724), and the other bolt connector (75) is located at the junction between the two rubber inclined tubes (731). The rubber straight tube (721), rubber bent tube (722), curved tube (723), transition tube (724), rubber inclined tube (731), and arc tube (732) are all made of nitrile rubber. The side wall of the rubber straight tube (721) is provided with a spiral hardening ring one, and the side wall of the rubber inclined tube (731) is provided with a circular hardening ring two arranged at equal intervals. Both the first hardening ring and the second hardening ring are hardened by a secondary vulcanization process. The bottom of the water tank (10) is equipped with casters (40), and the bottom of the water tank (10) is also equipped with a micro-tapping mechanism. The micro-tapping mechanism corresponds one-to-one with the algae attachment and conveying mechanism and is located directly below the algae attachment and conveying mechanism. The micro-tapping mechanism includes an aluminum trough (81) installed at the bottom of the water tank (10), an electromagnet (82) installed at the bottom of the aluminum trough (81), and a tapping element located above the electromagnet (82). The aluminum trough (81) and the bottom of the water tank (10) form a... There is a striking cavity (84) for the movement of a striking element. The striking element includes a spherical permanent magnet (83) and a conical shell (85). The large end of the conical shell (85) is fixedly connected to the diameter end of the permanent magnet (83). The conical shell (85) is made of aluminum alloy. The tip of the conical shell (85) is provided with a rounded part (86). A lead ball moving chamber (88) is formed between the conical shell (85) and the diameter end of the permanent magnet (83). A lead ball (87) is provided in the lead ball moving chamber (88). The electromagnet (82) generates a magnetic force that repels the permanent magnet (83) when energized, and the electromagnet (82) is intermittently energized; when the electromagnet (82) is energized, the magnitude of the current changes in a pulse manner; the surface of the conveyor belt (60) is covered with a layer of bacteria and algae. When the algae in the algal layer is Haematococcus pluvialis, the maximum amplitude produced by the tapping of the tapper on the bottom of the water tank (10) is 3.1 mm, and the total tapping time per day is 3 to 3.5 hours. When the algae in the algal layer is Scenedesmus obliquus, the maximum amplitude produced by the tapping of the tapper on the bottom of the water tank (10) is 5.7 mm, and the total tapping time per day is 1 to 1.2 hours. When the algae in the algal layer is Spirulina, the maximum amplitude produced by the tapping of the tapper on the bottom of the water tank (10) is 4.3 mm, and the total tapping time per day is 5 to 6 hours.

2. The wastewater treatment photobioreactor testing device for bacteria and algae as described in claim 1, characterized in that: The drive mechanism includes a second transmission chain (57) installed between two adjacent sets of algae attachment conveying mechanisms, two sets of second sprockets (55) adapted to the second transmission chain (57), and a connecting shaft (52) for connecting two sets of first sprockets (51) in the conveying assembly (30). The connecting shaft (52) is fixedly connected to the two sets of first sprockets (51) in the conveying assembly (30). The second sprocket (55) is located outside the first sprocket (51) and is fixedly connected to the connecting shaft (52). The drive mechanism also includes a motor for driving one of the second sprockets (55).

3. The wastewater treatment photobioreactor testing device for bacteria and algae as described in claim 2, characterized in that: Tensioning mechanisms are installed between the two ends of the connecting shaft (52) and the side wall of the water tank (10). The tensioning mechanism includes a bearing (31) sleeved on the end of the connecting shaft (52) and connecting plates (32) respectively disposed on both sides of the bearing (31). The tensioning mechanism also includes an adjustment mechanism for adjusting the vertical position of one of the bearings (31). The adjustment mechanism includes a vertically arranged first bolt (21), a collar (22) for limiting the vertical movement of the first bolt (21), and a nut (23) adapted to the first bolt (21). The side wall of the water tank (10) is provided with a first limiting groove (12) for the vertical movement of the end of the connecting shaft (52). A second limiting groove (13) is provided on both sides of the first limiting groove (12) and is parallel to the first limiting groove (12). A second bolt is provided at the second limiting groove (13). 34) The interior of the water tank (10) is provided with an inner plate (33). The center of the inner plate (33) is provided with a first mounting hole (331) for the end of the connecting shaft (52) to move. The edge of the inner plate (33) is provided with a screw hole (332) that is compatible with the second bolt (34). The end of the connecting shaft (52) passes through the first mounting hole (331) and the side wall of the water tank (10) and is connected to the bearing (31). The connecting plate (32) is fixedly connected to the outer ring of the bearing (31). The second bolt (34) passes through the connecting plate (32) and passes through the second limiting groove (13) and is threadedly connected to the screw hole (332). The end of the first bolt (21) passes through the collar (22) and contacts the outer ring of the bearing (31). The collar (22) is fixedly connected to the side wall of the water tank (10). The nut (23) is threadedly connected to the first bolt (21).

4. The wastewater treatment photobioreactor testing device for bacteria and algae as described in claim 1, characterized in that: The inner side of the first transmission chain (53) is provided with a plurality of connecting pieces (58), the connecting pieces (58) are fixedly connected to the links of the first transmission chain (53), and the end of the conveyor belt (60) is fixedly connected to the connecting pieces (58) by mounting screws (54).

5. The wastewater treatment photobioreactor testing device for bacteria and algae as described in claim 1, characterized in that: A pressure reducing valve, a buffer tank, and a solenoid valve are sequentially arranged between the storage bottle and the first gas tube (71). By controlling the opening and closing of the solenoid valve, carbon dioxide is intermittently ejected from the gas hole.

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