CN201999827U - High-efficiency stable sewage treatment device with bio-doubling process - Google Patents

Abstract

The utility model is an improvement to the biological multiplication process water treatment device, which is characterized in that the aerated aerobic area is an annular ditch, and there is a water flow propulsion device in the annular ditch, and the influent mixing reaction area, water lifting area, and sedimentation area are built inside the annular ditch. The annular ditch communicates with the sedimentation zone and the influent mixing reaction zone respectively. This pool structure better solves the contradiction between low dissolved oxygen and high sludge content required by the biological multiplication process, and can ensure the biological multiplication process requirements - low dissolved oxygen and high sludge concentration, thereby ensuring the actual effect and advantages of the biological multiplication process ;Treat to form two or more circulating currents, which not only facilitates the maintenance of the equipment without stopping the operation, but also has an adjustable and high reflux ratio, and the addition of controllable gates or valves between the lifting area and the annular ditch increases the practical efficiency. The operation is adjustable, and the aeration device can be flexibly added or started and stopped according to the treated water quality after construction or after completion. The application has good scalability and the device process has strong adaptability.

Description

Efficient and stable biological multiplication process sewage treatment device

technical field

The utility model is an improvement to the biological multiplication process water treatment device, especially relates to a highly efficient and stable biological multiplication process sewage treatment device that changes the layout of the treatment pool and can form two or more treatment cycles (a built-in joint biological multiplication treatment device in the annular ditch) ).

Background technique

The biological doubling process (Bio-dopp) is a novel sewage treatment process invented in Germany, which combines all single processes (biological nitrification, denitrification, phosphorus release, phosphorus absorption, organic matter oxidation, precipitation, etc.) In a rectangular tank with several different treatment units adjacent to each other, low dissolved oxygen (usually 0.3-0.5mg/l) is used to achieve vertical short-range nitrification/denitrification denitrification, and high sludge concentration (usually 5-8g/l) ensures The treatment is efficient and stable (low dissolved oxygen and high sludge concentration are the two major characteristics of its process). Compared with the existing water treatment process, it has the following advantages: simple operation, high-efficiency biological nitrogen removal and good phosphorus removal effect under low dissolved oxygen, simultaneous and short-range nitrification/denitrification denitrification in the same tank, efficient and continuous operation, stable water output, and low sludge production It shows that the remaining sludge can be reduced by 40-60% compared with the traditional process, the maintenance workload is small, the floor area is small, and the use of a rectangular pool saves a lot of land. The sewage treatment plant only needs half the area of a conventional process sewage treatment plant, and greatly reduces The pipeline investment is low, the investment and operation costs are low, and the investment and operation costs can be roughly reduced by about half. Therefore, it has been paid attention to and promoted in sewage treatment.

The existing biological multiplication process, the basic structure of the treatment tank plan layout is shown in Figure 1. In a rectangular tank, the aerobic aerobic zone 3, the air lift zone 2, and the influent mixed anaerobic reaction zone 1 (phosphorus release zone) are adjacently separated. , built-in mud-water separation packing 8 and the sedimentation area 4 of the scraper/suction machine 9. The treated water enters the influent mixed anaerobic reaction zone 1, dilutes and mixes with the mud-water mixture that has been initially treated, and performs anaerobic phosphorus release treatment in it, and then enters the gas stripping zone 2 through the bottom connection, and is lifted by the gas stripping device into the The aeration and aerobic zone 3 equipped with an aeration hose performs aerobic treatment in the aeration and aerobic zone, and then enters the influent mixed anaerobic reaction zone through the sedimentation zone 4, forming a single treatment cycle. Part of the sludge in the sedimentation tank is replenished through the bottom connected to the mixed anaerobic reaction zone, and the rest is discharged by the scraper/suction machine. However, in the actual engineering operation, due to the defects in the layout of the process treatment tank, it is difficult to achieve the required low dissolved oxygen (such as 0.3-0.5mg/l) and high-active sludge (such as 5-8g/l) in actual operation. Ideal state, so the actual project operation is difficult to achieve the design effect, the reason:

In the treatment of a single cycle, the mixing and flow of mud and water mainly rely on the hydrodynamic force generated by the bottom aeration hose and air lift, and the contradiction between low dissolved oxygen aeration and high sludge concentration is difficult to coordinate, such as satisfying low dissolved oxygen and low power generated by aeration , high sludge content is prone to sludge precipitation, which not only reduces the concentration of operating sludge and affects the treatment effect, but also affects the normal operation of the bottom aeration equipment; in order to prevent sludge settlement, increase the amount of aeration, and Because the dissolved oxygen is too large and it is difficult to achieve efficient short-range nitrification/denitrification, the dissolved oxygen in actual projects usually reaches about 2mg/l, resulting in short-range nitrification/denitrification effects that cannot meet the design requirements, resulting in low denitrification efficiency and easy The effluent nitrogen does not meet the standard. Secondly, the power of mud-water mixed circulation mainly depends on the liquid level difference formed by air lift. The relatively low flow rate and the long distance of treated water circulation also limit the increase of sludge concentration, and it is difficult to achieve the high sludge concentration required by biological multiplication. The reduction of sludge concentration will in turn affect the short-range nitrification/denitrification. At the same time, only relying on the circulation power provided by the liquid level difference generated by the air lift, and the circulating liquid passing through the sedimentation tank, resulting in a small circulation of the mixed liquid, poor adjustability of the reflux ratio, and load resistance. The shock and rain exposure shock ability is poor, for example, when the influent water quality is abnormal or the rainstorm, the sludge activity and concentration cannot be kept stable. Furthermore, the sedimentation zone and the aeration and aerobic zone are arranged side by side, and the sedimentation zone is responsible for the circulation flow, which not only makes it difficult to ensure the static flow required for clarification, which affects the clarification effect, but also tends to cause sludge sedimentation in the flowing mud water due to dead ends in the circulation. It causes the concentration of sludge in the circulating sewage to decrease; when the inflow of heavy rain suddenly increases, it is easy to cause a large flow of water to cause sludge loss, which also causes the concentration of circulating sludge to decrease after the rain. If the air lift is turned off, although the sludge can be reduced However, due to the lack of sludge renewal cycle, the nutrients required to maintain microbial metabolism are not enough, resulting in insufficient nutrients for microbial metabolism and "starvation death" without nutrient sources for microorganisms, resulting in a long recovery time for the system after rain, affecting normal water discharge , so the ability to resist the impact of heavy rain is poor. In addition, due to the layout of the pool-type treatment unit, there is only one cycle of mud-water mixture during the treatment process, and the pools are operated in series to form a closed single cycle. In this way, the maintenance of any pool will affect the operation of other pools. The above-mentioned defects caused by the structure of the treatment pool seriously affect the advantages and treatment effects of the biological multiplication process, which makes it difficult for the actual engineering operation to achieve the design effect and limits the advantages of the biological multiplication process.

Furthermore, the low dissolved oxygen in the biological doubling _process can treat waste water with low ammonia nitrogen content and save energy consumption. etc. (NH ₃ -N≥100mg/l), low dissolved oxygen will lead to insufficient oxygen supply in the aerobic zone, it is difficult to realize the complete oxidation of nitrogen and nitrogen, and affect the removal effect of ammonia nitrogen, thus limiting its application in high ammonia nitrogen wastewater, resulting in process limitations.

Chinese patent CN101602541 biological sewage treatment process and device, its treatment pool type is still multiplied with typical organisms, and its above-mentioned shortcoming brought by the pool type structure has not been overcome yet.

The above-mentioned deficiencies still have room for improvement.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art, and provide a method that can not only ensure that short-cut nitrification/denitrification requires low dissolved oxygen, but also has high sludge concentration without sedimentation, and can form two or more circulations during the treatment process, which can give full play to Efficient and stable biological multiplication process sewage treatment device with advantages of biological multiplication process.

Another purpose of the utility model is to provide a highly efficient and stable biological multiplication process sewage treatment device with good process adjustability and applicable to various waste waters.

The purpose of the utility model is realized, and the main improvement is to design the aeration and aerobic zone in the original organism doubling process as an annular ditch, in which a push-flow device forming a circulation is arranged, and the adjacent lifting zone, influent mixing reaction zone and sedimentation The area is moved to the inner side of the annular ditch, and the corresponding functional areas are connected, and at least two circulations are formed through the annular ditch, thereby overcoming the shortcomings caused by the layout of the existing biological multiplication process treatment pool, and realizing the purpose of the utility model. Specifically, the utility model high-efficiency and stable biological multiplication process sewage treatment device includes an influent mixed reaction zone, a water lifting zone, an aerated aerobic zone and a sedimentation zone connected by water according to the biological multiplied treatment process, and is characterized in that the aerated aerobic zone It is an annular ditch in which there is a water propulsion device, and the influent mixing reaction zone, water lifting zone, and sedimentation zone are built inside the annular ditch, and the annular ditch is respectively connected with the sedimentation zone and the influent mixing reaction zone.

The basic process of the utility model device is roughly the same as the biological multiplication sewage treatment process of the prior art:

To treat influent water, firstly enter the influent mixed reaction zone, which can be set to anoxic state or anaerobic state by adjusting the incoming return flow depending on the treated water quality, and carry out biological denitrification or biological phosphorus removal respectively. ;The sewage treated by biological denitrification or biological phosphorus removal enters the lifting area through the connecting port or pipe, and is lifted by the lifting device into the aerobic annular ditch. Under the promotion of the water flow propulsion device, a circulation is formed in the annular ditch, and through the annular ditch to other treatment Unit water distribution: For example, part of the mixed muddy water in the annular ditch enters the sedimentation area through the opening of the pool wall or the connecting pipe for mud-water separation, and the clarified water is collected and discharged by the upper outlet weir; part of the mixed muddy water flows through the opening of the pool wall according to the annular ditch and enters the inlet The water mixing reaction zone circulates (referred to as the small cycle), and a part of the mixed muddy water circulates in the annular ditch (referred to as the large cycle), so that the treated sewage forms at least two treatment cycles, and the circulation volume is adjusted according to the sewage water quality. The sedimentation tank settles sludge, and part of it flows back to the influent mixing reaction area through the openings of the tank wall to maintain a high sludge concentration during treatment, and the rest is discharged as excess sludge. Due to the addition of a push-flow device in the annular ditch, the flow rate of the mixed muddy water in the annular ditch is increased, which can ensure the small aeration volume under low dissolved oxygen required by the biological multiplication process, and the high sludge content does not settle (the flow of the mixed muddy water mainly depends on Pushing flow device (pushing flow) can not only ensure the short-cut nitrification/denitrification, but also maintain a high sludge content, which can ensure the advantages of the biological multiplication process. The volume of each pool is calculated and determined according to the water quality and process treatment requirements.

Among utility models:

The aerated aerobic annular ditch, firstly, as the existing biological doubling technology as an aerobic reaction zone, realizes vertical short-range nitrification/denitrification denitrification and biological removal of organic matter under low dissolved oxygen, and secondly, forms different circulations for treating mixed muddy water The water distribution channel forms at least two treatment circulations. According to this function, the shape of the annular ditch can be, for example, a rectangular ditch, or an arc-shaped ditch at both ends similar to an oxidation ditch. In order to prolong the circulation time of the mixed muddy water in the aerobic ditch, and to meet the circulation stay in a short plot Depending on the time requirements, the annular groove can also be designed as a set of two or more grooves. The oxygenation device in the annular ditch is basically similar to the biological multiplication process, mainly based on the bottom aeration oxygen supply device, such as various microporous aerators, jet aeration devices, and diffuse aeration for water treatment. Devices, etc., especially the microporous aerator is the best, the bubbles produced by it are small, the specific surface area is large, the rising flow rate is slow, the microorganisms can obtain oxygen more easily, and the oxygen transfer efficiency can be improved. In addition, according to the water quality of the treated water, such as wastewater treatment with too high or too low ammonia nitrogen, it is also possible to form two oxygenation modes: surface aeration device-based or bottom aeration + surface aeration by adding surface aeration devices. Increase dissolved oxygen in water.

The water propulsion device in the annular ditch is mainly to provide power for the rapid flow of mixed muddy water in the annular ditch. On the one hand, it ensures the realization of long circulation circulation. Mud settles. The aeration and oxygen supply for vertical short-range nitrification/denitrification is separated from the driving force of mixed mud water, so as to ensure the low dissolved oxygen required for short-range nitrification/denitrification and maintain a high sludge concentration in the circulating fluid, so it is easier The contradiction between high sludge concentration and low dissolved oxygen in the biological doubling process is well coordinated, so that the two can meet the uniform process requirements. The water propulsion device, since its main function is to provide the propulsive power of the mixed muddy water flow, theoretically there is no limit to the propeller, for example, it can be an impeller propeller, or a rotating disk or brush for oxidation ditch, as well as an ejector, suction Ejectors, etc., as long as the power that can promote the flow of water can be used, in order to avoid excessive oxygenation in the push flow from destroying low dissolved oxygen, one is preferably to use underwater propellers. From the formation of the push flow function, the propulsion device can be designed at any position of the annular ditch, and one of them is preferably installed near the lifting water area, and the water level difference of the lift can be used to increase the push flow at the same time, so as to reduce the push flow power. Depending on the length of the circular ditch designed for the treated water, the water flow propulsion device can be one place, or two or more on the process path. In the large cycle, in order to prevent the sludge from settling due to the decrease of the flow rate at the end of the cycle, the water propulsion device can be designed to run in both directions with gaps, such as forward and reverse rotation with the gap of the turntable, so that the alternating head and tail of the cycle can effectively prevent the end of the cycle. Sludge settling due to reduced flow rate.

The main function of the lifting device is the same as that of the biological multiplication process. It lifts the mixed muddy water from the influent mixing reaction zone into the outer annular ditch to form a renewal circulation. The lifting device can be a pump, or an air lifting device, or other devices with water lifting functions, such as opening holes in the lifting area and the wall of the annular ditch pool, and setting propellers, one of which is preferably air lifting, air lifting The utility model has the advantages of low energy consumption and energy saving. The lifting zone can be arranged in parallel with the influent mixing reaction zone, or vertically.

The influent mixing reaction area is the first step of influent water treatment. In addition to undertaking the influent mixing function, according to the influent water quality, it can be set to anoxic state or anaerobic state by adjusting the return flow into the influent area respectively. Respectively realize the main operation mode of biological denitrification or biological phosphorus removal, and realize the main two treatment functions of biological denitrification or biological phosphorus removal, so it can also be called anaerobic zone or anoxic zone .

also:

In order to improve the water flow state in the influent mixing reaction zone, prevent sludge settlement caused by high sludge concentration, and speed up the influent mixing, it is better to install accelerated mixing and agitating devices in the influent zone, such as impeller propellers, agitators, etc. Mixer, propeller to increase sewage mixing capacity and flow velocity.

In the sedimentation area, in order to achieve rapid clarification and improve the clarification effect, the biological multiplication process can be used to install sedimentation fillers to accelerate mud-water separation in the sedimentation tank, such as inclined plates or inclined tube mud-water separation fillers. Inclined plate or inclined pipe can adopt straight channel obliquely, such as 60-degree obliquely, or vertically curved corrugated inclined plate can be installed vertically; the sludge at the bottom is partly connected to the influent mixing reaction area through the bottom opening or connection. Activated sludge is supplemented to maintain the sludge content requirements, and part of it is discharged from the sedimentation tank. The discharge from the sedimentation tank can be discharged through the scraping/suction device installed in the sedimentation area, or through the suction pump fixedly installed in the sedimentation area or close to the sedimentation area. According to the structure of the sedimentation tank, its scraping and/or mud suction device can be reciprocating or rotating, and it only needs to leave a driving space on both sides or the center of the accelerated sedimentation sludge water separation filler.

In order to enhance the process adjustability of the shaped pool, improve the adaptability to sewage treatment, and further save energy consumption, it is better to set a gate or valve or a pusher with controllable flow rate on the common wall of the lifting area and the annular ditch. streaming device. During operation: For example, when the concentration of influent pollutants is low and the treatment requirements can be met through a small circulation flow, the lifting device can be stopped or reduced, and the gate or valve or the pushing device on the wall of the pool can be opened to replenish the annular ditch. Inlet water, which can save energy consumption and run in a more energy-efficient environment. In order to improve the "automatic power" of the self-flow into the annular ditch, the water flow propulsion device that promotes the circulation in the annular ditch is preferably installed at the front end of the controllable gate or valve or the water flow direction of the push flow device, and the "suction" formed by the push flow device , Enhance artesian "power" and artesian flow.

In order to improve the nitrogen removal ability of wastewater with high NH ₃ -N (such as leather and alcohol with NH ₃ -N ≥ 100 mg/l), the dissolved oxygen content of the aerobic ditch can be increased by increasing aeration, for example, the dissolved oxygen can be increased to 2 mg /l. The way to increase dissolved oxygen can be to increase the air supply volume of the bottom aeration, or to add surface aeration devices, such as oxygenation devices such as rotary discs and rotary brushes, or to use surface aeration alone for oxygen supply.

The utility model efficient and stable biological multiplication process sewage treatment device, compared with the existing biological multiplication process pool type, due to the change of the pool layout structure, the aerated aerobic area is changed to an annular ditch, and the water flow that promotes the circulation is set in the annular ditch In the propulsion device, other processing functional areas are built into the inner side of the annular ditch and adjacently arranged. This resulted in the following changes:

First of all, the circulation form of the treatment mixed liquid is changed and the circulation flow rate is increased, so that the treatment mixed mud water forms a small circulation of the influent mixed reaction zone-lifting zone-aerobic annular ditch-influent mixed reaction zone; and the large circulation in the aerobic annular ditch cycle; and there is also an aerobic annular ditch-sedimentation area outlet channel (sedimentation water is separated from the treatment cycle), so that when it is necessary to overhaul a certain unit of equipment, it will not stop running due to the inability to realize the treatment cycle. At the same time, the small cycle , the low-concentration circulating mixed solution that has been treated can dilute the influent water by a large ratio (the circulating flow rate can be dozens or even thousands of times the influent water volume according to needs), so that the concentration of pollutants in the influent water is rapidly reduced, and the influent water is in The concentration difference of pollutants in the pool in the influent mixed reaction area is greatly reduced, which more effectively avoids the impact of high concentration of COD in the influent on the activated sludge, stabilizes the microbial growth environment, and thus improves the ability to resist shock loads; the aerobic ditch The large cycle increases the hydraulic flow and residence time of sewage in the aerobic annular ditch (the aerobic flow is lengthened), which not only strengthens the removal of COD, BOD, NH ₃ -N, especially total nitrogen, but also due to the Pollutants are gradually degraded by microorganisms as the water circulates, and the concentration of pollutants decreases. At the end of the cycle, the concentration of dissolved oxygen and the content of nitrate nitrogen increase, thereby strengthening the denitrification function and treating refractory organic wastewater and poor biochemical properties. Wastewater has a better treatment effect, especially if the annular ditch is designed as a set of second ditch or above, it prolongs the circulation time of mixed muddy water and the high-end process of dissolved oxygen at the end, which improves the sewage treatment capacity and ensures the total output of water. The nitrogen is stable up to the standard, and this design also improves the adaptability to short and small plots. The high circulation flow rate ensures that under low aeration dissolved oxygen (dissolved oxygen can be as low as 0.1mg/l), high sludge content (for example, sludge concentration 8g/l) will not cause sludge sedimentation, which is better solved The biological multiplication process requires low dissolved oxygen and high sludge content contradiction; in addition, the high flow rate generated by the propeller also accelerates the mixing of mud and water and the mass transfer in contact with oxygen, which can ensure the advantages of the biological multiplication process; increasing the push flow can further Increase sludge concentration. In addition, the design of the groove shape and the addition of the plugging device also improve the return ratio and the adjustability of the return ratio, and the return ratio can be flexibly adjusted according to the sewage treatment situation; the large return ratio maintains a high sludge concentration, High sludge concentration can ensure lower dissolved oxygen in vertical short-range nitrification/denitrification, and the effect of short-range nitrification/denitrification is good. The coordination between the two is the biggest difference between this patent and the existing biological multiplication tank layout.

Secondly, the sedimentation area is placed in the annular ditch, which is only used for the separation and clarification of mud and water, without the original function of circulation and flow. Separation of sedimentation filler can also achieve sedimentation separation well; moreover, it overcomes the phenomenon of sludge sedimentation caused by dead angle caused by overcurrent in the sedimentation area in the prior art, and reduces the concentration of circulating sludge.

Furthermore, a controllable gate or valve is added between the lifting area and the annular ditch, so that the lifting device can be closed when the concentration of pollutants in the water is exposed to rain or low, and the connection of the gate or valve is used to provide fresh mixed liquid for the circulation and maintain a certain amount of supplementary circulation. , so as to ensure the maintenance of the nutrients required for microbial metabolism, which can avoid the “starvation death” of microorganisms without nutrient sources due to the lack of nutrients in microbial metabolism due to closed lifting, resulting in no supplementary mixed liquid circulation, and also saves energy consumption for aeration and achieves more energy-saving operation. . At the same time, when exposed to rain, the incoming water can directly enter the sedimentation area and be discharged directly after clarification, avoiding the phenomenon of sludge loss caused by heavy flow caused by heavy rain, improving the process's ability to resist the impact of heavy rain, and making it easy for the system to resume use. At the same time, a controllable gate or valve is added between the lifting area and the annular ditch, which also improves the flexibility of the treatment device to adjust according to the sewage treatment.

The utility model efficient and stable biological multiplication process sewage treatment device maintains the operating conditions of the biological multiplication process, and is different from the existing biological multiplication pool type. Its annular ditch has a built-in biological multiplication treatment pool type to ensure the biological multiplication process requirements—— Low dissolved oxygen and high sludge concentration are more achievable in actual projects. The dissolved oxygen in this patent pool type can be controlled at 0.1-0.5mg/l, and the sludge concentration can actually be increased to 5-8g/l or higher (depending on push flow) without sludge settling. It overcomes the shortcomings of the layout of the existing biological multiplication process treatment units that are difficult to overcome, can give full play to the treatment effect and advantages of the biological multiplication process, and has strong adaptability to the device process, and can adjust the total reflux ratio according to different treatment sewage and treatment requirements, and two The circulating back flow can efficiently and stably realize the biological multiplication process, and improve the ability to resist impact load and rain exposure impact, which is the biggest feature of the utility model device.

Add or replace oxygenation devices such as aeration discs and rotary brushes on the aerobic ditch. By increasing the dissolved oxygen content in the aerobic ditch, for example, increasing the dissolved oxygen to 2 mg/l or higher, the resistance to high NH ₃ - N (such as NH ₃ -N ≥ 100mg/l leather, alcohol and other waste water nitrogen removal capacity, expanding the application range of biological multiplication process. Moreover, this device can flexibly increase the aeration device according to the treatment water quality after construction or completion The realization improves the flexibility of the patented device, and the application expandability is good, which overcomes the limitation that it is difficult to expand the function after the existing biological multiplication process pool layout is completed.

Below in conjunction with a number of specific embodiments, illustrate and help to further understand the essence of the utility model, but the specific details of the embodiment are only for illustrating the utility model, and do not represent all technical solutions under the concept of the utility model, so it should not be interpreted as a summary of the utility model According to the limitation of the technical solution, some insubstantial additions and/or changes that do not deviate from the concept of the utility model, such as simple changes or replacements with technical features with the same or similar technical effects, fall within the protection scope of the utility model.

Description of drawings

Fig. 1 is a schematic diagram of the basic pool layout of the biological multiplication process in the prior art.

Figure 2 is a schematic diagram of the basic pool layout of the utility model efficient and stable biological multiplication process sewage treatment device.

Fig. 3 is a schematic view of the pool type arrangement of the second embodiment.

Fig. 4 is a schematic diagram of the pool arrangement of the third embodiment.

Fig. 5 is a schematic view of the pool layout of the fourth embodiment.

Fig. 6 is a schematic diagram of pool layout in the fifth embodiment.

Fig. 7 is a schematic diagram of pool layout in the sixth embodiment.

Fig. 8 is a schematic diagram of a pool arrangement in the seventh embodiment.

Fig. 9 is a schematic diagram of another pool arrangement in the seventh embodiment.

Fig. 10 is a schematic diagram of yet another pool arrangement in the seventh embodiment.

Fig. 11 is a schematic diagram of a pool arrangement in the eighth embodiment.

Fig. 12 is a schematic diagram of another pool arrangement in the eighth embodiment.

The internal devices are omitted in Fig. 3-12.

Detailed ways

Embodiment 1, referring to Fig. 2, utility model efficient and stable biological multiplication process sewage treatment device, comprises elongated hollow rectangular annular ditch 3, and microporous aerator 5 is arranged at the bottom of the whole ditch to form aerobic treatment functional area, the inner side of annular ditch Arranged adjacently from left to right: a rectangular precipitation zone 4, an influent mixing reaction zone 1 and an air stripping zone 2. The sedimentation zone 4 is built with an inclined pipe 8 for accelerated sedimentation and separation with a width smaller than the pool width and a driving type scraper and suction machine 9; an underwater mixing propeller 6 is arranged in the influent mixing reaction zone 1 near the end of the sedimentation zone; the gas lift zone 2 is provided with a gas stripping device 7 . The pool wall shared by the airlift area 2 and the annular ditch 3 has a connected opening and a controllable gate 11 is provided, and a hydraulic propeller 10 is installed underwater at the upper end of the gate water flow in the annular ditch 3 . There are through holes on the wall of the annular ditch 3 and the sedimentation area 4 according to the design flow rate, and there are return holes on the wall of the annular ditch 3 and the influent mixed reaction area 1, and there is sewage at the bottom of the sedimentation area 4 and the influent mixed reaction area 1. The mud return channel, the influent mixing reaction zone 1 and the bottom of the lifting zone 2 are connected. The aeration rate of the microporous aerator at the bottom of the aerobic annular ditch is detected by the online dissolved oxygen meter and controlled by the frequency conversion fan controlled by PLC, so that the air supply of the fan changes with the concentration of the incoming water, ensuring that the biological multiplication process design has a low dissolved oxygen amount, It will not affect the effluent water quality due to insufficient oxygen supply, nor will it cause changes in bacterial species due to excessive oxygen supply, reducing the effect of short-range nitrification/denitrification. The connection ports between the treatment pools are equipped with controllable gates, and the opening amount can be adjusted according to the treatment requirements to achieve process optimization.

The treated sewage first enters the influent mixing reaction zone 1, and is quickly mixed with the raw mud-water mixture under the action of the propeller 6 to complete the mixing and dilution of the influent and the diluted mixed solution. According to the quality of the treated water, the inflow and return flow rates are set respectively. In the anoxic state or anaerobic state, it realizes the denitrification or phosphorus removal function; it enters the lifting area 2 through the bottom communication channel, enters the aerobic annular ditch 3 under the lift of the air lift device 7, and forms a one-way under the push flow of the water flow propulsion device 10 Circulation: part of the mixed muddy water enters the sedimentation zone 4 through the hole in the pool wall or the connecting pipe, and separates the muddy water to clarify the effluent discharge system; part of the mixed muddy water enters the influent mixing reaction zone 1 through the aerobic annular channel through the hole in the pool wall or the connecting pipe A treatment cycle (small cycle) is formed, and a part of the mixed muddy water circulates in the annular ditch (large cycle), and simultaneously realizes short-range nitrification/denitrification denitrification and degradation of organic matter. According to the actual treatment situation, adjust the gas lift volume and the water volume entering the sedimentation tank and water mixing reaction zone respectively. The sedimentation tank settles the sludge, and part of it flows back to the influent mixing reaction area through the bottom connection, and the rest is discharged by the scraper/suction machine as excess sludge. According to the test: when the flow velocity in the annular ditch reaches 0.3m/s and above, the sludge concentration is 8g/l and no sludge settlement phenomenon is found.

When the content of pollutants in the influent is low and the treatment requirements can be met only through the circulation of the main ditch, the air lift can be stopped, the valve can be opened, and an appropriate amount of influent water can be maintained to maintain the nutrients required for microbial metabolism, so as to meet the treatment requirements. Save lifting energy consumption, and avoid the harm caused by the lack of nutrients in microbial metabolism caused by closing the lifting and causing no water replacement cycle.

In the case of heavy rain, the water intake increases and the sewage concentration decreases. The lifting device can also be temporarily closed, and the sewage directly enters the sedimentation area and is discharged directly after the water is separated by the filler. In this way, the phenomenon of sludge loss caused by the large flow caused by the heavy rain is avoided, and the ability to resist the impact of the heavy rain is improved; at the same time, the valve is opened to maintain an appropriate amount of water to replace the cycle, maintain the nutrients required for microbial metabolism, and facilitate system recovery and use.

Embodiment 2, referring to Fig. 3, as embodiment 1, wherein settling zone 4 is designed as a circular settling tank, near settling tank 4 near water inlet mixed reaction zone 1 is provided with sludge lift pump 12 (also can adopt in settling tank Rotary scraper/suction machine).

Embodiment 3: Referring to FIG. 4, as in Embodiment 2, the annular groove 3 is changed to an elliptical track type.

Embodiment 4: Referring to Fig. 5, as in embodiment 1, the annular ditch 3 is changed to an elliptical runway type, the lifting area 2 is designed as a semicircle, the settling area 4 is designed as a circular sedimentation tank, and the reciprocating scraper/suction machine is replaced by Rotary scraper/suction dredge.

Embodiment 5: Referring to FIG. 6 , as in Embodiment 1, the stripping zone 2 is parallel to the long surface of the annular groove 3 .

Embodiment 6: Referring to Fig. 7, as mentioned above, the settling tank 4 and the stripping area 2 are respectively arranged as two left and right. The two can run side by side at the same time, or one can be run independently when the equipment in it is overhauled, so as to ensure that the operation will not stop during the overhaul.

Embodiment 7: Refer to Figures 8, 9, and 10, as in Embodiment 6, wherein the water inlet mixing reaction zone 1 is also arranged as two in parallel, and the two can be operated in parallel at the same time, or one can be operated separately when the equipment in it is overhauled , so as to ensure that the operation will not stop during maintenance.

The aforementioned influent mixing reaction zone, water lifting zone and settling zone can be provided separately or simultaneously.

Embodiment 8: Referring to Figures 11 and 12, as mentioned above, the annular groove can be designed as a double or multiple groove nesting structure, and two or more water flow propellers can be designed.

In addition, when dealing with high-ammonia-nitrogen wastewater, oxygenation devices such as turntables can be added to the aerobic annular ditch, or the bottom aeration rate can be increased, or the surface aeration device can be used instead of the bottom aeration device, and the oxygenation rate can be increased to achieve The treatment of high ammonia nitrogen wastewater ensures that the effluent nitrogen discharge meets the standard.

For those skilled in the art, under the inspiration of the patent concept and specific embodiments, some deformations that can be directly derived or associated from the patent disclosure and common sense, those of ordinary skill in the art will realize that other methods can also be used, Or the replacement of commonly known technologies in the prior art, and the different combinations of features, such as the change of the shape of each process area, the change of the water flow propulsion device in the annular ditch, such as the use of a turntable, the change of the aeration device, the water inlet area Insubstantial changes such as changing the hydraulic propeller to a suction or stirring type, forward and reverse push flow in the gap of the water propulsion device, etc., can also be applied, and can achieve the functions and effects described in this patent, and will not give examples one by one. To elaborate, all belong to the scope of protection of this patent.

The utility model device can be a factory prefabricated structure or an on-site structure according to the amount of treated water.

Claims (14)

1. Efficient and stable biological multiplication process sewage treatment device, including influent mixed reaction zone, water lifting zone, aerated aerobic zone and sedimentation zone connected by water according to the biological multiplied treatment process, characterized in that the aerated aerobic zone is an annular ditch , there is a water flow propulsion device in the annular ditch, the influent mixing reaction zone, the water lifting zone, and the sedimentation zone are built inside the annular ditch, and the annular ditch is respectively connected with the sedimentation zone and the influent mixing reaction zone. 2. The efficient and stable biological multiplication process sewage treatment device according to claim 1, characterized in that the aerated aerobic zone is supplied with oxygen by bottom aeration. 3. The efficient and stable biological multiplication process sewage treatment device according to claim 2, characterized in that the bottom aeration oxygen supply is a microporous aerator. 4. The efficient and stable biological multiplication process sewage treatment device according to claim 1, characterized in that at least one water flow propulsion device is arranged near the lifting water outlet area. 5. The efficient and stable biological multiplication process sewage treatment device according to claim 1, characterized in that the water lifting device in the water lifting area is an air lifting device. 6. The efficient and stable biological multiplication process sewage treatment device according to claim 1, characterized in that there is an accelerating mixing and agitating device in the influent mixing reaction zone. 7. The efficient and stable biological multiplication process sewage treatment device according to claim 1, characterized in that there are fillers for accelerating sedimentation and separation in the sedimentation zone. 8. The high-efficiency and stable biological multiplication process sewage treatment device according to claim 1, characterized in that there are communication holes and controllable gates or valves on the common wall of the water lifting area and the annular ditch. 9. The efficient and stable biological multiplication process sewage treatment device according to claim 8, characterized in that the water flow propulsion device in the annular ditch is arranged at the front end of the controllable gate or valve in the direction of water flow. 10. The high-efficiency and stable biological multiplication process sewage treatment device according to claim 1, characterized in that there are rotating discs and rotating brushes on the annular ditch. 11. The efficient and stable biological multiplication process sewage treatment device according to claim 1, characterized in that there are two influent mixing reaction zones, water lifting zone and sedimentation zone separately or simultaneously. 12. The efficient and stable biological multiplication process sewage treatment device according to claim 1, characterized in that each communication port between the treatment pools has a controllable gate. 13. The high-efficiency and stable biological multiplication process sewage treatment device according to any one of claims 1 to 12, characterized in that there are two or more annular grooves nested together. 14. The efficient and stable biological multiplication process sewage treatment device according to claim 1 or 7, characterized in that there are scraping and/or mud suction and mud discharge devices in the sedimentation area. the

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