CN212334946U

CN212334946U - System device for treating sewage by using tubular algae membrane reactor

Info

Publication number: CN212334946U
Application number: CN202021557960.5U
Authority: CN
Inventors: 魏群; 罗晓暄; 赵宸; 马湘蒙; 饶峻石; 郑思米; 叶华
Original assignee: Guangxi University; CCFEB Civil Engineering Co Ltd
Current assignee: Guangxi University; CCFEB Civil Engineering Co Ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-01-12
Anticipated expiration: 2030-07-31

Abstract

The utility model discloses an application tubular algae membrane reactor handles system's device of sewage, the system's device is formed by connecting raw water tank, tubular algae membrane system, ultrafiltration membrane system, play water tank in proper order according to the rivers direction. The tubular algae membrane system is formed by alternately connecting a light-transmitting tubular reactor and a light-tight tubular reactor, wherein an algae membrane is arranged in the light-transmitting tubular reactor and can be detached relative to the light-transmitting tubular reactor; the light-transmitting tubular reactor and the light-tight tubular reactor are fixedly arranged through a fixing frame; the fixed frame is provided with an adjustable illuminating lamp. The utility model discloses can handle sewage through the photosynthesis of the algae membrane in the printing opacity tubular reactor and the respiration of the suspension algae in the light-tight tubular reactor to carry out algae-laden water through sedimentation tank and milipore filter and separate, promoted sewage advanced treatment efficiency and algae collection effect by a wide margin, use the utility model discloses it is effectual, equipment utilization is rateed high to handle sewage nitrogen and phosphorus removal.

Description

System device for treating sewage by using tubular algae membrane reactor

Technical Field

The utility model relates to a sewage treatment technical field specifically is an application tubular algae membrane reactor handles system's device of sewage.

Background

Along with the intensification of the urbanization construction process in China, the discharge and the production of urban sewage are increasingly increased, and the operation load of an urban sewage treatment plant is increased. In recent years, many domestic sewage treatment plants are under the work of new construction and upgrading modification so as to improve the sewage treatment capacity and the effluent quality and reduce the pollution of sewage to the water environment, in particular to the water eutrophication caused by nitrogen and phosphorus pollutants in the sewage. During the process of photosynthesis and assimilation of algae by light energy, nutrients such as nitrogen and phosphorus in water can be effectively absorbed to generate substances of the algae. According to the characteristics, the algae has good application prospect in the fields of sewage treatment and water environment treatment. A large number of researches show that the algae has very obvious removal effect and effect on nutrient substances such as nitrogen, phosphorus and the like in domestic sewage, industrial sewage, agricultural sewage and the like. Therefore, an algae sewage treatment system for realizing advanced treatment of nitrogen and phosphorus in sewage and nutrient reuse is an attractive technology.

The algae membrane is formed by combining algae and a carrier, and the research results at home and abroad show that the algae membrane can more effectively remove pollutants, particularly nitrogen and phosphorus pollutants, and simultaneously can produce algae biomass products when being used for sewage treatment compared with the traditional sewage treatment technology, and the algae resource technology can obtain higher economic benefit and reduce the sewage treatment cost. Christenson et al (Christenson Logan B, Sims Ronald C, Biotechnology and Bioengineering, 2012, 109(7): 1674-. Gao et al (Gao, F., Yang, Z.H, Li, C.et al, Bioresource Technology, 2015, 179: 8-12) developed a novel algae biofilm treatment Technology (BMPBR) with a solid support and submerged membrane module for adjunctive growth of chlorella and secondary effluent treatment. The experimental result shows that compared with a suspended growth Membrane Photobioreactor (MPBR), the novel algae biofilm treatment technology (BMPBR) has a more stable denitrification effect and higher algae biomass.

The development history of the algae in the sewage treatment is decades old, and the treatment forms include a high-efficiency algae pond, a biological stabilization pond, a hydraulic algae bed, an algae photobioreactor, an immobilized algae system and the like. Because the growth and propagation of algae are easily affected by external environmental factors such as temperature, pH, illumination and the like, the large-scale, industrialized culture and engineering application of algae are restricted by algae culture technology and bioreactors. According to the existing research, the design principle of the algae photobioreactor is as follows: the light energy is fully utilized, the expansibility is good, the mixing degree is high, the operation condition is controllable, and the like, so that various types of Photobioreactors (PBR) have been well developed in recent years and are mainly divided into open type and closed type light culture systems. The two culture systems have advantages and disadvantages, the open system has less investment, low cost and simple technology, but is easily influenced by the external environment, the closed system has good controllability, but the engineering cost is high, and the amplification culture is difficult. In recent years, ultrafiltration membrane technology is also researched in the field of algae-laden water separation, the research mainly focuses on pretreatment technology and membrane pollution characteristics, and the algae-laden water separation needs to be carried out by using the ultrafiltration membrane technology in practical engineering, and the comprehensive consideration needs to be carried out from the aspects of membrane pollution, water yield, energy consumption and the like. Currently, research on algae membranes tends to optimize the removal of new contaminants and from the reactor configuration, and research on ultrafiltration membrane algae-water separation is mainly in terms of membrane fouling characteristics and control. The research on the complete sewage treatment system formed by combining the two technologies of removing pollutants by the algae membrane and separating algae water by the ultrafiltration membrane is less. The development of the algae membrane-ultrafiltration membrane sewage treatment device which can be put into practical sewage treatment application has very important significance for the development of the algae membrane sewage treatment technology.

Patent CN201310380921.0 discloses a sewage denitrification and dephosphorization advanced treatment method, which mainly comprises pretreatment, treatment by an algae membrane bioreactor, treatment by an inclined plate sedimentation tank and membrane filtration treatment. The sewage is firstly pretreated, then enters an algae membrane bioreactor to carry out high-efficiency nitrogen and phosphorus removal on the sewage, then enters an inclined plate sedimentation tank to precipitate suspended matters so as to prevent subsequent filter membranes from being blocked, and finally the sewage is filtered by a membrane component, and filtrate is stored in a permeate liquid pool so as to be reused. Namely discloses a sewage treatment system formed by sequentially connecting a pretreatment tank, an algae membrane bioreactor, an inclined plate sedimentation tank and a membrane filter. However, each reactor of the disclosed algae membrane bioreactor is provided with an algae membrane, and the illumination intensity and the illumination period of each reactor cannot be independently adjusted, so that the operation cost is high. Chenyanfei in the research of 'novel sewage denitrification and dephosphorization experiment of algae membrane process system' of the Master graduate thesis proposes to construct an algae membrane process system consisting of a water inlet tank, a peristaltic pump, an algae membrane reactor, an inclined plate sedimentation tank, an ultrafiltration membrane device and a water outlet tank, and the algae biofilm and ultrafiltration membrane dual-membrane system is used for treating domestic sewage to improve the water quality of outlet water. But the algae membrane process system is currently only staying in the laboratory testing stage.

Domestic and foreign researches show that factors such as temperature, illumination (intensity or period), pH, dissolved oxygen and the like all have influence on the denitrification and dephosphorization effect of the algae. Because of more influencing factors, how to adjust a plurality of main influencing factors in one set of system device and continuously and efficiently treat sewage is a development direction for optimizing the reactor structure at present.

Disclosure of Invention

The utility model provides an application tubular algae membrane reactor handles system's device of sewage, the system's device can carry out continuous, high-efficient ground to sewage and handle, and promote sewage advanced treatment efficiency and algae collection effect by a wide margin, use the utility model discloses handle that sewage denitrogenation dephosphorization is effectual, go out that water quality of water is good, equipment utilization is high.

The technical scheme of the utility model as follows:

a system device for treating sewage by using a tubular algae membrane reactor is formed by sequentially connecting a raw water tank, a tubular algae membrane system, an ultrafiltration membrane system and an effluent water tank according to the water flow direction. The tubular algae membrane system is formed by alternately connecting a light-transmitting tubular reactor and a light-tight tubular reactor, wherein an algae membrane is arranged in the light-transmitting tubular reactor, and the algae membrane is detachable relative to the light-transmitting tubular reactor.

The light-transmitting tubular reactor and the light-tight tubular reactor are both vertical tubular reactors, and the tubular reactor consists of a top circular end cover, a cylindrical part and a conical part from top to bottom; the water inlet of the tubular reactor is arranged at one side below the cylindrical part, and the water outlet is arranged at the other side above the cylindrical part. A sludge discharge port is arranged at the cone top of the conical part, a valve is arranged at the sludge discharge port, and the valve at the sludge discharge port is opened periodically to clean algae sludge deposited at the bottom of the tubular reactor; the inclination angle of the cone is 30-60 degrees. The valves are arranged on the water inlet pipeline and the water outlet pipeline of the tubular reactor, the vent pipe is arranged on the water outlet pipeline, the lowest point of the vent pipe is higher than the liquid level in the tubular reactor, the communication between the air in the tubular reactor and the atmosphere can be realized, and the oxygen generated by the photosynthesis of algae in the tubular reactor and the carbon dioxide generated by the respiration can be discharged out of the tubular reactor. The bent-tube type vent pipe is preferably selected as the vent pipe, and the influence of external pollution on the operation of the device can be reduced by the design of the bent tube. The vent pipe is arranged on the water outlet pipeline instead of the tubular reactor, so that the influence of external pollution on the operation of the tubular reactor is more favorably weakened. In order to avoid overflowing water in the tubular reactor from the vent pipe, the opening degree of a water inlet and outlet valve needs to be strictly controlled, or a liquid leakage monitoring alarm device is arranged on the vent pipe, and the liquid leakage monitoring alarm device is triggered once water enters the vent pipe.

The light-transmitting tubular reactor and the light-tight tubular reactor are fixedly arranged through a fixing frame; the fixing frame is provided with an inclined plane, the inclined plane and the horizontal ground form an included angle of 45-90 degrees, the light-transmitting tubular reactor is fixed above the inclined plane, and the light-proof tubular reactor is fixed below the inclined plane; the inclined plane is arranged high and long according to the length, the diameter and the parallel number of the tubular reactors, the inclined plane is divided into a plurality of layers in the height direction of the inclined plane through a long plate or a long pipe, and the long plate or the long pipe is provided with a plurality of annular pipe sleeves for fixing the tubular reactors. The fixed frame is provided with a lighting lamp. The illuminating lamps are arranged on the periphery above the inclined plane of the fixing frame and can also be arranged on a long plate or a long pipe in the middle of the inclined plane. The illumination lamp can adjust the illumination intensity.

The algae film is formed by combining algae and a carrier, can be directly cultured and formed in the light-transmitting tubular reactor, and can also be moved into the light-transmitting tubular reactor after being cultured and formed in other devices in advance; the fixing parts of the algae membranes are arranged on the top circular end cover and the conical side wall inside the light-transmitting tubular reactor, and the algae membranes are unfolded in the light-transmitting tubular reactor through the fixing parts and can be detached relative to the light-transmitting tubular reactor. The fixing piece can be in a hook-shaped, annular, semi-annular and other structures with any shapes, and only needs to be capable of fixing the algae membrane and convenient to detach. The diameter of the light-transmitting tubular reactor is smaller, strip-shaped algae membrane carriers can be selected, and fixing parts of the algae membranes can be arranged on the circle center of the top circular end cover and the side wall of the cone close to the sludge discharge port.

The culture method of the algae membrane comprises the steps of pretreating a carrier, installing the pretreated carrier in a culture device, adding BG11 culture medium, inoculating algae liquid into the culture medium, uniformly mixing, statically culturing until the algae membrane is basically membrane-hung, namely when the carrier surface is green and bubbles are generated, introducing sewage to be treated according to the set flow of hydraulic retention time, equivalently replacing the culture medium until the culture medium is completely replaced, namely, completing the domestication of the algae membrane, and starting to treat the sewage.

The direct cultivation of algae membrane in transparent tubular reactor includes installing carrier inside the transparent tubular reactor and culturing membrane inside the transparent tubular reactor. The algae membrane is directly cultured in the transparent tubular reactor, the operation is simpler and more convenient, the domesticated algae membrane can immediately carry out sewage treatment with high-efficiency treatment capacity, but the whole sewage treatment device needs to stop operating for 10-15 days because the culture and domestication time is longer. The algae membrane is cultured and formed in other devices in advance and then is moved into the light-transmitting tubular reactor, namely, a carrier is installed in other devices, membrane hanging and domestication are carried out, and the domesticated algae membrane is moved into the light-transmitting tubular reactor; or installing a carrier in other devices, performing biofilm culturing, and moving the biofilm cultured in the transparent tubular reactor for acclimatization. The algae membrane is cultured and formed in other devices in advance and then is transferred into the light-transmitting tubular reactor, so that the culture and domestication time of the algae membrane can be saved, and the operation of the whole sewage treatment device can be recovered in a short time.

The ultrafiltration membrane system consists of a dosing device, a sedimentation tank and an ultrafiltration membrane component, wherein the dosing device is arranged on a pipeline in front of a water inlet of the sedimentation tank, a water outlet of the sedimentation tank is connected with a water inlet of the ultrafiltration membrane component, and supernatant of the sedimentation tank is sent into the ultrafiltration membrane component through an ultrafiltration pump for ultrafiltration, so that algae and water are completely separated, and the quality of effluent water reaches the standard.

The dosing device is a full-automatic dosing device, and the dosing time and the dosing amount of the flocculating agent can be adjusted according to the sewage flow and the pollutant concentration. After sewage is treated by the pipe-type algae membrane system, a certain amount of suspended algae is contained in the effluent, the water quality of the effluent can be influenced, and before the effluent flows into the sedimentation tank, a flocculating agent is uniformly mixed into the effluent through a dosing device, so that the suspended algae can be more easily settled in the sedimentation tank.

The water inlet of the sedimentation tank is arranged on one side above the sedimentation tank, the water outlet is arranged on the other side above the sedimentation tank, and the water inlet is higher than the water outlet; the bottom of the sedimentation tank is of a cone structure, the inclination angle of the cone is 30-60 degrees, a sludge discharge port is arranged at the cone top of the cone, a valve is arranged at the sludge discharge port, and the valve at the sludge discharge port is opened periodically to clean the algae sludge deposited at the bottom of the sedimentation tank.

Be provided with the baffle near water inlet department in the sedimentation tank, the lower extreme of baffle is less than the delivery port for flocculation algae physical stamina is direct sedimentation tank lower part, improves and subsides efficiency, avoids the flow to influence the play water quality when big. The sedimentation basin may be round or square.

Both the raw water tank and the outlet water tank can be round or square. And a liquid feeding pump is arranged between the water outlet of the raw water tank and the water inlet of the tubular algae membrane system and used for feeding liquid. The bottom of the raw water tank can also be arranged into a cone structure, the inclination angle of the cone is 30-60 degrees, a sludge discharge port is arranged at the cone top of the cone, a valve is arranged at the sludge discharge port, and pollutants precipitated at the bottom of the raw water tank are cleaned by periodically opening the valve at the sludge discharge port.

The ultrafiltration membrane component is controlled by PLC fully automatically and can be adjusted to operate according to the sewage flow. The ultrafiltration membrane component is any one or the combination of more than two of a tubular ultrafiltration membrane, a plate-frame type ultrafiltration membrane, a roll type ultrafiltration membrane or a hollow fiber type ultrafiltration membrane.

The material of the light-transmitting tubular reactor is not limited, as long as the external illuminating lamp can be ensured to be capable of irradiating algae cells through the wall of the reactor, so that the algae cells can be fully subjected to photosynthesis, and the light-transmitting tubular reactor can be a PVC transparent tube, a PC transparent tube or an acrylic glass tube and the like.

The material of the light-tight tubular reactor is not limited as long as the light-tight tubular reactor can meet the strength requirement and has no light and no biotoxicity, and the light-tight tubular reactor can be a PPR (polypropylene random) tube, a PE (polyethylene) tube or a PVC (polyvinyl chloride) tube and the like.

The algae species are not limited, and may be one or more of Sphaerotheca vaginalis (Oedomonas sp), Anabaena flos-aquae (Anabaena flors-aquae), Chlorella pyrenoidosa (Chlorella pyrenoidosa), Scenedesmus obliquus (Scenedesmus obliquus), Scenedesmus aquaticus (Hydrodictyon reticulum), and Oscillatoria ardhii (Oscilaria agardhii).

The carrier is a three-dimensional elastic carrier, a semi-soft carrier or a soft carrier and the like.

The main body material of the fixing frame is not limited, and can be carbon steel, stainless steel, alloy steel or polytetrafluoroethylene.

The utility model has the advantages that:

the utility model discloses a tubular algae membrane system that is formed by connecting in turn printing opacity tubular reactor and light tight tubular reactor is as the main processing system of sewage, and tubular reactor is one kind and is tubulose, the very big continuous operation reactor of draw ratio, belongs to the plug flow reactor, chooses for use tubular reactor as algae bioreactor to provide the basis of practical feasibility for the continuous processing of sewage. The transparent tubular reactor and the opaque tubular reactor are alternately connected, sewage can be continuously treated through photosynthesis of algae in the transparent tubular reactor and respiration of suspended algae in the opaque tubular reactor, the transparent tubular reactor can be kept under 24-hour illumination conditions every day, the algae can be used for carrying out photosynthesis for 24 hours to efficiently treat the sewage, and in the transparent tubular reactor, by utilizing the flat push effect, the water quality of algae cells at any position in the reactor and the sewage in contact with the algae cells is almost similar, the growth adaptability of the algae cells is good, the photosynthesis can be kept in a relatively good state all the time, and reduction of the photosynthesis caused by that the algae cells in contact with different water qualities need to adapt for a certain time due to environmental change is avoided. When adopting alga to handle sewage under the illumination condition, the algae cell utilizes the organic matter in the sewage to synthesize self nutrient composition, and release oxygen, the photosynthesis of algae cell can receive certain degree's suppression when the content of dissolved oxygen in aquatic is too high, thereby reduce the efficiency that algae membrane handled sewage, discharge the sewage that contains suspension living algae into light-tight tubular reactor, utilize the respiration of suspension living algae to consume partial dissolved oxygen, can effectively avoid next light-transmitting tubular reactor algae cell to appear supersaturated oxygen inhibition, improved the sewage treatment capacity of algae membrane in the light-transmitting tubular reactor, saved sewage treatment's time simultaneously.

The utility model discloses can install outdoors, utilize the sunlight to provide the illumination condition for the photosynthesis of algae cell daytime, save and provide the required electric energy of illumination. Compared with the existing algae membrane bioreactor, the cost of the light-transmitting tubular reactor is higher than that of the light-proof tubular reactor, and the system device of the utility model is used for processing under the same sewage treatment capacity, so that the required number of the light-transmitting tubular reactors is less, and the cost of the device is lower; when the number of the light-transmitting tubular reactors is the same, the sewage treatment capacity of the whole system device is larger, the sewage treatment capacity can be increased by increasing the number of the tubular reactors, and the continuity of sewage treatment is better. The utility model discloses a system's device can also be under the prerequisite that keeps higher nitrogen, phosphorus clearance, adjusts the handling capacity and the processing time of sewage through volume, the connection quantity and the connected mode of adjustment tubular reactor, and in actual operation, the flexibility is stronger, has solved current algae membrane sewage treatment system in actual operation sewage treatment ability for the laboratory research problem that descends. And the utility model discloses the system device receives external influence little, the operation is stable, can guarantee to go out continuous long-time operation under the prerequisite of water quality, and sewage treatment capacity is big.

The utility model discloses with two technologies combination of algae membrane pollutant removal and milipore filter algae moisture, carry out algae moisture through sedimentation tank and milipore filter and separate, add the flocculating agent through charge device earlier in the sedimentation tank and make most algae body can subside fast get off, the rethread milipore filter further separates remaining algae body and suspended solid, has promoted sewage advanced treatment efficiency and algae collection effect by a wide margin, and is difficult to block up the milipore filter, and the feasibility is high. Therefore, use the utility model discloses handle sewage and compare in current algae membrane reactor, nitrogen and phosphorus removal effect is better, efficiency is faster and equipment utilization is higher.

Drawings

FIG. 1 is a schematic structural diagram of the system apparatus of the present invention;

FIGS. 2 and 3 are block diagrams showing alternative connection of the transparent tubular reactor and the opaque tubular reactor in the tubular algae membrane system of the present invention;

FIG. 4 is a schematic structural view of the transparent tubular reactor of the present invention;

FIG. 5 is a schematic structural view of the opaque tubular reactor of the present invention;

FIG. 6 is a schematic structural view of the sedimentation tank of the present invention;

fig. 7 is a schematic structural view of the fixing frame of the present invention.

The labels in the figure are: 1. a raw water tank; 2. a liquid feeding pump; 3. a light-transmitting tubular reactor; 4. a light-tight tubular reactor; 5. a dosing device; 6. a sedimentation tank; 7. an ultrafiltration pump; 8. an ultrafiltration membrane module; 9. a water outlet tank; 10. a connecting member; 11. an end cap; 12. a breather pipe; 13. a valve; 14. a water outlet; 15. algae; 16. a sludge discharge port; 17. a fixing member; 18. a water inlet; 19. a carrier; 20. a baffle plate; 21. a fixed mount; 22A and 22B, an annular shroud; 23. an illuminating lamp.

Detailed Description

In order to introduce the present invention in more detail, the present invention will be further described with reference to the following embodiments.

Example 1

A system device for treating sewage by using a tubular algae membrane reactor is formed by sequentially connecting a raw water tank 1, a liquid feeding pump 2, a tubular algae membrane system, an ultrafiltration membrane system and a water outlet tank 9 according to the water flow direction. The tubular algae membrane system is formed by alternately connecting a light-transmitting tubular reactor 3 and a light-tight tubular reactor 4, wherein an algae membrane is arranged in the light-transmitting tubular reactor 3 and can be detached relative to the light-transmitting tubular reactor 3. The ultrafiltration membrane system is composed of a dosing device 5, a sedimentation tank 6 and an ultrafiltration membrane component 8, wherein the dosing device 5 is arranged on a pipeline in front of a water inlet 18 of the sedimentation tank 6, a water outlet 14 of the sedimentation tank 6 is connected with a water inlet of the ultrafiltration membrane component 8, an ultrafiltration pump 7 is connected in the middle, and supernatant of the sedimentation tank 6 is sent into the ultrafiltration membrane component 8 through the ultrafiltration pump 7 for ultrafiltration. A liquid feeding pump 2 is arranged between the water outlet of the raw water tank 1 and the water inlet of the tubular algae membrane system, and liquid is fed through the liquid feeding pump 2, wherein the liquid feeding pump is preferably a peristaltic pump. The structure schematic diagram of the system device is shown in fig. 1, however, in fig. 1, only 3 transparent tubular reactors and 3 opaque tubular reactors are listed and alternately connected, and the number of the transparent tubular reactors and the opaque tubular reactors is selected according to actual needs, and may be more than 1.

The light-transmitting tubular reactor 3 and the light-tight tubular reactor 4 are both vertical tubular reactors, and the tubular reactors are composed of a top circular end cover 11, a cylindrical part and a conical part from top to bottom; the top circular end cap 11 is sealingly connected to the cylindrical part by means of a connection 10, which may be a flange, a bolt, a screw, etc. The water inlet 18 of the tubular reactor is arranged on one side below the cylindrical section and the water outlet 14 is arranged on the other side above the cylindrical section. A sludge discharge port 16 is arranged at the conical top of the conical part, and a valve 13 is arranged at the sludge discharge port 16; the inclination angle of the cone is 30-60 degrees. The pipe type reactor is characterized in that valves 13 are arranged on water inlet and outlet pipelines of the pipe type reactor, a vent pipe 12 is further arranged on a water outlet pipeline of the pipe type reactor, the lowest point of the vent pipe 12 is higher than the liquid level in the pipe type reactor, and the valve 13 on the water outlet pipeline is arranged behind the vent pipe 12. The bent-tube type vent pipe is preferably selected as the vent pipe, and the influence of external pollution on the operation of the device can be reduced by the design of the bent tube. The schematic structural diagrams of the light-transmitting tubular reactor 3 and the light-tight tubular reactor 4 are shown in fig. 4 and 5, respectively.

The light-transmitting tubular reactor 3 and the light-tight tubular reactor 4 are fixedly arranged through a fixing frame 21; the fixing frame 21 is provided with an inclined plane, and the included angle between the inclined plane and the horizontal ground is 45-90 degrees; the inclined plane is arranged to be high and long according to the length, the diameter and the parallel number of the tubular reactors, and is divided into a plurality of layers in the height direction of the inclined plane through a long plate or a long pipe, and a plurality of annular pipe sleeves 22 are arranged on the long plate or the long pipe and used for fixing the tubular reactors. The transparent tubular reactor 3 is fixed above the inclined surface by an annular pipe sleeve 22A above the inclined surface, and the opaque tubular reactor 4 is fixed below the inclined surface by an annular pipe sleeve 22B below the inclined surface. An illumination lamp 23 is provided above the inclined surface of the fixing frame 21. The illumination lamps 23 may be disposed around the upper portion of the inclined surface of the fixing frame 21, or may be disposed on a long plate or tube in the middle of the inclined surface, as shown in fig. 7. The illumination lamp can adjust the illumination intensity.

The algae film is formed by combining algae 15 and a carrier 19, can be directly cultured and formed in the light-transmitting tubular reactor 3, and can also be moved into the light-transmitting tubular reactor 3 after being cultured and formed in other devices in advance. Fixing pieces 17 of algae membranes are arranged on the top circular end cover 11 and the side wall of the cone in the transparent tubular reactor 3, the algae membranes are unfolded in the transparent tubular reactor 3 through the fixing pieces 17, and the algae membranes can be detached relative to the transparent tubular reactor 3. The fixing member 17 may have any shape such as a hook, a ring, or a semi-ring, as long as it can fix the algal membrane and is easily detachable. The diameter of the transparent tubular reactor 3 is small, strip-shaped algae film carriers can be selected, the fixing parts 17 of the algae films can be arranged on the circle center of the top circular end cover 11 and the side wall of the cone close to the sludge discharge port 16, and the algae film carriers can be completely spread along the center of the reactor in the transparent tubular reactor through the two hooks, as shown in figure 4.

The direct cultivation of algae membrane in transparent tubular reactor includes installing carrier inside the transparent tubular reactor and culturing membrane inside the transparent tubular reactor. The algae membrane is directly cultured in the light-transmitting tubular reactor, the operation is simpler and more convenient, the domesticated algae membrane can immediately carry out sewage treatment with high-efficiency treatment capacity, but the whole sewage treatment device needs to stop operating for 10-15 days because the culture and domestication time is longer; therefore, the cultivation method is suitable for being used when the whole tubular algae membrane system is firstly started up or restarted, and the algae membrane needs to be cultivated for all the transparent tubular reactors, or when the transparent tubular reactors are long and not suitable for replacing the algae membranes. The algae membrane is cultured and formed in other devices in advance and then is moved into the light-transmitting tubular reactor, namely, a carrier is installed in other devices, membrane hanging and domestication are carried out, and the domesticated algae membrane is moved into the light-transmitting tubular reactor; or installing a carrier in other devices, performing biofilm culturing, and moving the biofilm cultured in the transparent tubular reactor for acclimatization. The algae membrane is cultured and formed in other devices in advance and then is moved into the light-transmitting tubular reactor, so that the culture and domestication time of the algae membrane can be saved, the operation of the whole sewage treatment device can be recovered in a short time, and the culture mode is suitable for being carried out when the algae membrane needs to be replaced for a certain light-transmitting tubular reactor during the operation of the tubular algae membrane system, or when the algae membrane is replaced for a short time conveniently by the light-transmitting tubular reactor.

The dosing device 5 is a full-automatic dosing device and can adjust the dosing time and the dosing amount of the flocculating agent according to the sewage flow and the pollutant concentration.

A water inlet 18 of the sedimentation tank 6 is arranged on one side above the sedimentation tank 6, a water outlet 14 is arranged on the other side above the sedimentation tank 6, and the water inlet 18 is higher than the water outlet 14; the bottom of the sedimentation tank 6 is of a cone structure, the inclination angle of the cone is 30-60 degrees, a sludge discharge port 16 is arranged at the cone top of the cone, and a valve 13 is arranged at the sludge discharge port 16.

A baffle 20 is arranged in the sedimentation tank 6 close to the water inlet 18, and the lower end of the baffle 20 is lower than the water outlet 14, so that flocculated algae can directly reach the lower part of the sedimentation tank 6, the sedimentation efficiency is improved, and the influence on the water outlet quality when the flow is large is avoided. The sedimentation basin 6 may be round or square.

The raw water tank 1 and the effluent water tank 9 may be circular or square. The bottom of the raw water tank 1 can also be arranged into a cone structure, the inclination angle of the cone is 30-60 degrees, a sludge discharge port is arranged at the cone top of the cone, and a valve is arranged at the sludge discharge port.

When the device operates, sewage of a raw water tank is sent into a light-transmitting tubular reactor of a tubular algae membrane system through a liquid sending pump, then the sewage is discharged from a water outlet of the last tubular reactor of the tubular algae membrane system and enters an ultrafiltration membrane system from a water inlet of a sedimentation tank, a flocculating agent is added into a water inlet pipeline by a dosing device before the water inlet of the sedimentation tank to be uniformly mixed with water so as to improve the sedimentation efficiency of algae, then supernatant of the sedimentation tank is sent into the ultrafiltration membrane module through an ultrafiltration pump for ultrafiltration, the water discharged from a water outlet of the ultrafiltration membrane module is stored in a water outlet tank, and the supernatant can be discharged outside or used for industrial and agricultural production after being detected to be qualified.

One connection mode of the light-transmitting tubular reactor and the light-tight tubular reactor is as follows: light-transmitting tubular reactor I → light-transmitting tubular reactor i → light-transmitting tubular reactor II → light-transmitting tubular reactor ii → light-transmitting tubular reactor III → light-transmitting tubular reactor iii → light-transmitting tubular reactor IV → light-transmitting tubular reactor iv → light-transmitting tubular reactor V → … … (see the part connected by the large hollow arrow in FIG. 2). When all the light-transmitting tubular reactors and the light-transmitting tubular reactors in the tubular algae membrane system can normally operate, the operation is carried out according to the connection mode.

In addition to the above connection, there are also the following connection methods: light-transmitting tubular reactor I → light-transmitting tubular reactor ii → light-transmitting tubular reactor iii, light-transmitting tubular reactor III → light-transmitting tubular reactor iv, light-transmitting tubular reactor i → light-transmitting tubular reactor III, light-transmitting tubular reactor ii → light-transmitting tubular reactor IV, light-transmitting tubular reactor iii → light-transmitting tubular reactor V, and so on (see the part for connection → in FIG. 2). In the connecting chain of the transparent tubular reactor and the opaque tubular reactor, the previous transparent tubular reactor is connected with the two opaque tubular reactors immediately behind the previous transparent tubular reactor in parallel, and the previous opaque tubular reactor is connected with the two transparent tubular reactors immediately behind the previous opaque tubular reactor in parallel. When a certain or two adjacent tubular reactors in the tubular algae membrane system cannot work or a certain transparent tubular reactor needs to replace the algae membrane, a certain connection mode can be started, the inoperable tubular reactor or the transparent tubular reactor needing to replace the algae membrane is skipped, and the tubular algae membrane system can continue to operate. Furthermore, when the tubular reactor needs to be temporarily reduced in the installed tubular algae membrane system, a certain connection mode can be started to adjust to a better sewage treatment state.

Meanwhile, a pipeline is also arranged at the water outlet of the raw water tank and connected with the water inlet of the light-transmitting tubular reactor II, the pipeline is in a closed state at normal time, and the pipeline is opened only when the algae membrane of the light-transmitting tubular reactor I needs to be replaced or any one of the light-transmitting tubular reactor I and the light-proof tubular reactor i fails and cannot operate.

When the last tubular reactor of the tubular algae membrane system is a transparent tubular reactor, a pipeline is arranged at the water outlet of the previous opaque tubular reactor of the transparent tubular reactor and is connected to the front of the dosing device, and when the transparent tubular reactor needs to be replaced with the algae membrane or fails and cannot operate, the transparent tubular reactor can be temporarily skipped. Through the mode that series connection and parallel connection combine together, use series connection mode as the owner, parallel connection is for later use, improves the operation flexibility of whole tubular algae membrane system even whole device.

Another way of connecting the light-transmissive tubular reactor and the light-opaque tubular reactor is as follows (see fig. 3): transparent tubular reactor I (1, 2, 3 … … N) → opaque tubular reactor i → transparent tubular reactor II (1, 2, 3 … … N) → opaque tubular reactor ii → transparent tubular reactor III (1, 2, 3 … … N) → opaque tubular reactor iii → transparent tubular reactor IV (1, 2, 3 … … N) → opaque tubular reactor iv → … …. N is more than or equal to 2 and less than or equal to 6, namely 2-6 light-transmitting tubular reactors are simultaneously connected with front and back light-transmitting tubular reactors, water inlets of the light-transmitting tubular reactors I (1, 2 and 3 … … N) are connected with a raw water tank in parallel through liquid feeding pumps, and the staying time of sewage in the tubular reactors can be adjusted according to the sewage treatment capacity of each light-transmitting tubular reactor through the connection mode.

Preferably, the ultrafiltration membrane component is a PVDF hollow fiber type ultrafiltration membrane component, so that algae water can be completely separated, the quality of effluent flowing into the effluent water tank reaches the standard, the membrane component is convenient to operate, and the operation is stable.

The flocculant is not limited in kind, and can be more than one of polyaluminium chloride (PAC), polyaluminium ferric chloride (PAFC), polyaluminium ferric sulfate (PAFS), polyferric sulfate (PFS), Polyacrylamide (PAM) and the like, so that suspended algae can be guaranteed to be well settled.

Preferably, the light-transmitting tubular reactor is made of acrylic glass, so that the tubular reactor is high in light transmission, high in hardness, good in anti-aging performance and convenient to maintain.

Preferably, the opaque tubular reactor is a hard PVC pipe, so that the opaque tubular reactor is corrosion-resistant and convenient to maintain.

The algae may be more than one of Coccomys vaginalis, Anabaena flos-aquae, Chlorella pyrenoidosa, Scenedesmus obliquus, Neurospora aquatica, and Oscillatoria alforei.

Preferably, the carrier is a three-dimensional elastic carrier, so that the generated algae membrane can be uniformly spread in an all-dimensional and three-dimensional manner, has a large surface area, is fully contacted with sewage, and can perform good physiological activities.

Preferably, the main body material of the fixing frame is stainless steel, so that the fixing frame can support the weight of the tubular reactor and is corrosion-resistant.

The culture of the algae membrane comprises the steps of pretreating a carrier, hanging the algae membrane and domesticating the algae membrane, and comprises the following specific steps:

(1) pretreating the carrier: soaking the carrier in 0.05-1.5mol/L NaHCO₃Soaking in the solution for 23-25h, washing with deionized water for 3-5 times, soaking the obtained carrier in 0.05-2.0mol/L hydrochloric acid for 6-14h, washing with deionized water for 3-5 times, air drying, and installing in a culture device;

(2) algae biofilm culturing: adding BG11 culture medium into the culture device, inoculating algae in the culture medium with initial concentration of 0.1-5g/L, mixing, and statically culturing for 6-7 d;

(3) domestication of algae membranes: after the basic biofilm formation of the algae membrane is finished, the culture medium is equivalently replaced by introducing the sewage to be treated according to the set flow of the hydraulic retention time until the culture medium is completely replaced, and the domestication of the algae membrane is finished and the domestication can be used for sewage treatment.

Claims

1. A system device for treating sewage by using a tubular algae membrane reactor is characterized in that the system device is formed by connecting a raw water tank (1), a tubular algae membrane system, an ultrafiltration membrane system and a water outlet tank (9) in sequence according to the water flow direction; the tubular algae membrane system is formed by alternately connecting a light-transmitting tubular reactor (3) and a light-tight tubular reactor (4), wherein an algae membrane is arranged in the light-transmitting tubular reactor (3), and the algae membrane is detachable relative to the light-transmitting tubular reactor; the light-transmitting tubular reactor (3) and the light-tight tubular reactor (4) are fixedly arranged through a fixing frame (21); an illuminating lamp (23) is arranged on the fixed frame (21); the ultrafiltration membrane system consists of a dosing device (5), a sedimentation tank (6) and an ultrafiltration membrane component (8), wherein the dosing device (5) is arranged on a pipeline in front of a water inlet (18) of the sedimentation tank (6), and a water outlet (14) of the sedimentation tank (6) is connected with a water inlet of the ultrafiltration membrane component (8).

2. The system for sewage treatment with a tubular algal membrane reactor of claim 1 wherein the light transparent tubular reactor (3) and the light impermeable tubular reactor (4) are vertical tubular reactors, the tubular reactors are composed of top circular end caps (11), cylindrical sections, conical sections from top to bottom; a water inlet (18) of the tubular reactor is arranged at one side below the cylindrical part, and a water outlet (14) of the tubular reactor is arranged at the other side above the cylindrical part; a sludge discharge port (16) is arranged at the cone top of the cone part, a valve (13) is arranged at the sludge discharge port, and the inclination angle of the cone is 30-60 degrees.

3. The system for treating wastewater using a tubular algal membrane reactor of claim 2 wherein the tubular reactor is provided with valves (13) on both its inlet and outlet conduits and with a vent tube (12) on its outlet conduit, the vent tube (12) having a lowest point higher than the liquid level in the tubular reactor.

4. The system for treating wastewater using a tubular algal membrane reactor of claim 1, wherein the algal membrane is formed by combining algae (15) with a carrier (19), and can be directly grown and formed in the transparent tubular reactor (3) or moved into the transparent tubular reactor (3) after being grown and formed in advance in other devices; fixing pieces (17) of the algae membrane are arranged on the top circular end cover (11) and the side wall of the cone inside the light-transmitting tubular reactor (3), the algae membrane is unfolded in the light-transmitting tubular reactor (3) through the fixing pieces (17), and the algae membrane is detachable relative to the light-transmitting tubular reactor (3).

5. The system for treating wastewater using a tubular algal membrane reactor according to claim 1, wherein a liquid feeding pump (2) is further provided between the raw water tank (1) and the tubular algal membrane system, and wastewater stored in the raw water tank (1) is fed into the tubular algal membrane system for treatment by the liquid feeding pump (2).

6. The system for treating wastewater using a tubular algal membrane reactor of claim 1, wherein the inlet (18) of the settling tank (6) is disposed at one side above the settling tank (6), the outlet (14) is disposed at the other side above the settling tank (6), and the inlet (18) is higher than the outlet (14); the bottom of the sedimentation tank (6) is of a cone structure, the inclination angle of the cone is 30-60 degrees, a sludge discharge port (16) is arranged at the cone top of the cone, and a valve (13) is arranged at the sludge discharge port.

7. The system for sewage treatment using a tubular algal membrane reactor of claim 6 wherein a baffle (20) is disposed in the settling tank (6) near the water inlet (18), the lower end of the baffle (20) being lower than the water outlet (14).

8. The system device for treating sewage by using the tubular algal membrane reactor of claim 1, wherein the ultrafiltration membrane module (8) is any one or a combination of two or more of a tubular ultrafiltration membrane, a plate and frame type ultrafiltration membrane, a roll type ultrafiltration membrane, and a hollow fiber type ultrafiltration membrane.

9. The system for treating wastewater using a tubular algal membrane reactor of claim 1 wherein the illumination lamp (23) can adjust the intensity of illumination.