A fully aerated ECIS sewage treatment device

Abstract

This application relates to the field of wastewater treatment technology, specifically disclosing an ECIS wastewater treatment device capable of achieving full aeration, comprising a treatment tank, a filtration tank, and a discharge system arranged sequentially; the treatment tank is equipped with a physicochemical and biochemical treatment unit, in which wastewater undergoes a physicochemical and biochemical treatment process for nitrogen and phosphorus removal. The physicochemical and biochemical treatment unit includes an electrode assembly, an aeration system, and a reflux system; the key feature is that microbial self-flocculating particles are introduced into the treatment tank; the aeration system includes an independently controllable aeration device located at the bottom of the treatment tank, the aeration device being equipped with a pusher that generates downward thrust; the bottom of the treatment tank is a conical bottom with an inclination angle greater than 55 degrees, solving the technical problem that existing single-chamber small wastewater treatment equipment has low efficiency in treating wastewater and cannot meet the requirements of rapid wastewater treatment in real life.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an ECIS wastewater treatment device that can achieve full aeration. Background Technology

[0002] Wastewater refers to water that has been polluted during domestic and industrial processes, losing its original function. Direct discharge of wastewater can harm the environment, leading to the deterioration of other water bodies and soil pollution. Therefore, wastewater treatment plants are built in cities and industrial areas to centrally treat domestic or industrial wastewater before its discharge.

[0003] However, for some water users with small, scattered wastewater volumes (such as highway service stations, supply stations in border areas, and small villages far from cities), it is very difficult to collect wastewater. Building small wastewater treatment plants for each water user is also cost-effective due to the small volume of wastewater. To solve this problem of scattered wastewater, engineers began to miniaturize the wastewater treatment equipment of large wastewater treatment plants, integrating anaerobic, anoxic, aerobic, and sedimentation tanks into a single device. For example, patent application CN202311433259.0 discloses an ECOF four-micro-physicochemical membrane small-scale wastewater treatment device for scattered wastewater treatment in highway service area toll stations, rural areas, towns, cities, enterprises, industrial parks, and residential communities. It consists of an electrolysis tank, anaerobic tank, anoxic tank, aerobic tank, sedimentation tank, electrocoagulation tank, and filtration membrane tank arranged sequentially on a single tank. These tanks sequentially perform electrolysis, biochemical treatment, electrocoagulation, and filtration on the wastewater, thereby achieving nitrogen and phosphorus removal. However, because this type of small sewage treatment equipment has multiple tanks, and each tank needs a certain volume (setting it too small is not conducive to sewage treatment and is also prone to clogging), there is a certain limit to the miniaturization of its multiple tank sewage treatment equipment.

[0004] In response, engineers devised a solution that utilizes a single tank to simultaneously perform electrolysis, biochemical reactions, and electroflocculation. For example, patent CN202311433578.1 discloses a small-scale ECIS four-micro physicochemical membrane wastewater treatment device, which only includes a treatment tank and a filtration tank. The treatment tank performs electrolysis, biochemical reactions, physicochemical reactions, and electroflocculation on the wastewater, removing nitrogen and phosphorus while simultaneously causing pollutants to flocculate and settle. The treated wastewater overflows into the filtration tank for filtration before being discharged. This technology overcomes the limitations of miniaturized wastewater treatment equipment. However, because it requires completing all four processes within the same chamber, each wastewater treatment cycle necessitates sequential electrolysis, anoxic phase, aerobic phase, and electroflocculation phase within the treatment tank. A single treatment cycle for a 3-ton small-scale wastewater treatment unit takes over 5 hours, which is too inefficient and cannot meet the requirements for rapid wastewater treatment in practice. Summary of the Invention

[0005] The purpose of this invention is to provide an ECIS wastewater treatment device that can achieve full aeration, thereby solving the technical problem mentioned above that the efficiency of small single-chamber wastewater treatment equipment in the prior art is low and cannot meet the requirements of rapid wastewater treatment in real life.

[0006] To address the aforementioned issues, an ECIS wastewater treatment device capable of achieving full aeration is provided, comprising a treatment tank, a filtration tank, and a discharge system arranged sequentially. The treatment tank contains a physicochemical and biochemical treatment unit, within which wastewater undergoes a physicochemical and biochemical treatment process for nitrogen and phosphorus removal. The physicochemical and biochemical treatment unit includes an electrode assembly, an aeration system, and a reflux system. Microbial self-flocculating particles are introduced into the treatment tank. The aeration system includes an independently controllable aeration device located at the bottom of the treatment tank, and the aeration device is equipped with a pusher that can push air downwards. The bottom of the treatment tank has a conical bottom with an inclination angle greater than 55 degrees.

[0007] The beneficial effects of this implementation plan are as follows:

[0008] 1. In order to adapt to the requirements of scattered and fragmented sewage treatment, engineers have pushed the limits of miniaturization of sewage treatment devices in the existing technology. They have only set up a sewage treatment chamber in the sewage treatment equipment. Therefore, the processes such as electrolysis, anoxic stage, aerobic stage and electrocoagulation stage need to be carried out in sequence according to the time axis in this chamber. Each process requires a certain amount of time, resulting in low sewage treatment efficiency. To improve wastewater treatment efficiency, the time required for the electrolysis, anoxic, aerobic, and electroflocculation stages must be shortened. Therefore, engineers studied the entire device and found that in existing ECIS wastewater treatment units, the aeration device is positioned above the conical bottom with the disc facing upwards. Consequently, when air enters the wastewater treatment unit, bubbles rise rapidly, and the wastewater at the bottom of the aeration disc is not adequately aerated. To ensure effective wastewater treatment and improve aeration efficiency, oxygen must be allowed to dissolve in the water before being transferred downwards, resulting in an excessively long aerobic stage. To address this, this application designs a novel aeration device. Utilizing the downward pushing force of this new device, the gas is propelled downwards. Upon encountering the conical bottom, due to the narrow space at the bottom, the gas and water flow impact and cause the gas to churn, allowing it to quickly rebound and flow upwards. This ensures that the wastewater below the device not only comes into contact with the air but also forms convection with the upper wastewater, resulting in a more uniform overall aeration effect. Therefore, the aerobic stage time can be reduced, thereby shortening the single-cycle treatment time of the wastewater treatment equipment in this application.

[0009] 2. To shorten the settling time, this application adds microbial self-flocculating particles to the treatment tank. These particles are formed by the self-aggregation of microorganisms under specific operating conditions. Due to their high bacterial density, they have a strong wastewater treatment capacity and settle quickly, making them a good choice for this type of small-scale wastewater treatment equipment. However, it was found during operation that the microbial self-flocculating particles promote the proliferation of filamentous bacteria during wastewater treatment. The filamentous bacteria have a relatively loose structure, and excessive proliferation can damage the structure of the microbial self-flocculating particles, resulting in poor particle structure and the formation of flocs with poor settling performance. Therefore, a longer settling time is required. If drainage is carried out before the settling is complete, the discharged water will carry out a large number of bacteria, leading to a decrease in the sludge concentration in the treatment tank and eventually system collapse, making it impossible to treat the water. Therefore, the settling time cannot be reduced, limiting the wastewater treatment efficiency of this application. By observing and studying the formation process of microbial self-flocculating particles, it was found that the magnitude of shear force in the water is a crucial factor in particle formation. Therefore, it is inferred that a certain range of shear force can cause the rapidly growing filamentous bacteria on the sludge surface to shrink or detach, thus forming dense particles. Too low a shear force will not cause the filamentous bacteria to shrink or detach, while too high a shear force may damage the particle structure. Therefore, controlling the magnitude of the shear force within a suitable range is sufficient to maintain the stability of microbial self-flocculating particles. Shear force is the tangential force generated per unit area of ​​fluid during the flow of a viscous fluid due to the interactions of molecular collisions and friction. The calculation formula is r = udu / dx, where du / dx is the tangential velocity gradient, also known as the shear rate, and μ is the dynamic viscosity coefficient of the liquid. From the above formula, it can be seen that the fluid shear force is directly proportional to the shear rate. We can control the magnitude of the shear rate to manage the changes in shear force within the reactor, thus maintaining the stability of the sludge particles. The higher the aeration intensity (apparent air velocity), the greater the fluid shear rate. Therefore, controlling the aeration intensity can control the shear force environment within the treatment tank, ensuring the stability of the microbial self-flocculating particles. However, in existing technologies, the aeration device is located above the conical bottom of the treatment tank. When air enters the wastewater treatment device during aeration, the gas quickly rises and forms a shear force field above, but the sludge at the bottom is not subjected to shear force. This causes filamentous bacteria to proliferate on the surface of the microbial self-flocculating particles, destroying the particle structure. In this application, a pusher is designed to generate downward thrust on the gas. The pusher drives the gas downward, lifting the sludge at the bottom. The resulting shear force field comes into contact with the sludge, cutting off the filamentous bacteria from the particle surface, causing them to shrink or detach, thus maintaining the stability of the microbial self-flocculating particles. Therefore, this application can utilize the pusher and the microbial self-flocculating particles to achieve rapid settling, reducing the settling time from the original 2 hours to less than 15 minutes. Thus, the efficiency of wastewater treatment in this application is greatly improved.

[0010] 3. Since wastewater requires biochemical treatment by microorganisms, but the microorganisms themselves are too small, and there are many disturbances in the wastewater treatment process, making it easy for the microorganisms to overflow and not exist stably in the treatment tank. In order to ensure the stability of the microorganisms in the treatment tank, the existing technology puts microbial carriers into the treatment tank. The microbial carriers are inorganic particles with a porous structure and the pores gradually increase from the inside to the outside (such as porous volcanic rock). However, these particles are too small and have many pores, so they are difficult to settle. In this application, the microbial carrier is changed to microbial self-flocculation particles. The particles have a solid structure, so the settling time is shorter. Experiments have shown that the original half hour of sedimentation has been reduced to less than 15 minutes.

[0011] Furthermore, the aeration device includes an air inlet pipe, and the pusher includes a bell-shaped jar with openings at the top and bottom, inside which are pusher blades. The bell-shaped jar structure with openings at the top and bottom ensures that when the pusher blades push the gas to the bottom, they do not only push the gas, but also mix the water and gas into a gas-water mixture and push it downwards. This not only makes oxygen more soluble in water, but also generates a large number of small bubbles. The bursting of these small bubbles generates small shear forces, making it easier to shear filamentous bacteria.

[0012] Furthermore, the microbial self-flocculating particles are granular sludge from anaerobic ammonia-oxidizing bacteria.

[0013] Furthermore, a conical flow guide platform is connected to the lower end of the bell jar. The conical flow guide platform guides the gas-water mixture to flow around the treatment tank, avoiding dead corners where shearing force cannot be formed, and ensuring that filamentous bacteria are sheared off.

[0014] Furthermore, the angle of inclination of the conical base is greater than 55 degrees.

[0015] Furthermore, the air intake pipe is connected to the air delivery pipe, which has a ring structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a structural schematic diagram from a second perspective of the present invention.

[0018] Figure 3 This is a schematic diagram of the front structure of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the aeration device of the present invention.

[0020] Figure 5 This is a schematic diagram of the pusher structure of the present invention.

[0021] Figure 6 This is a schematic diagram of the internal structure of the pusher of the present invention.

[0022] Figure 7 This is a top view of the installation disk of the present invention.

[0023] Figure 8 This is a simplified diagram of the pipe connection structure of the present invention. Detailed Implementation

[0024] The following detailed description of specific implementation methods further illustrates the following: It should be noted that this application is an iterative upgrade based on the patent document with application number CN202311433578.1 (a small-scale wastewater treatment device with ECIS four-micro physicochemical membrane), therefore, the prior art mentioned in the process can be referred to the above patent document.

[0025] The reference numerals in the accompanying drawings include: treatment tank 1, foam outlet 11, filter tank 2, pipe cavity 3, aeration device 4, air supply pipe 41, pusher 42, air inlet pipe 421, bell jar 422, conical diversion platform 423, mounting plate 424, fixing ring 4241, cross support component 4242, connecting platform 4243, rotating shaft fixing ring 4244, pushing fan blade 425, air inlet pipe 43, microbial self-flocculating particles 5, and electrode assembly 6.

[0026] Implementation, for example, attached Figure 1-7 The diagram shows an ECIS wastewater treatment device capable of achieving full aeration, comprising three chambers arranged sequentially: a treatment tank 1, a filter tank 2, and a piping chamber 3. Both treatment tank 1 and filter tank 2 are vertically oriented rectangular cylindrical structures, with funnel-shaped conical bottoms to facilitate the collection and discharge of settled sludge at the bottom. The funnel-shaped bottom of treatment tank 1 forms an angle greater than 55 degrees with the ground. Treatment tank 1 is equipped with electrode components 6, an aeration system, and self-flocculating microbial granules 5. Filter tank 2 is equipped with stainless steel fine filter components. A horizontal pipe is located in the middle of treatment tank 1, connecting to filter tank 3. A solenoid valve is installed on the horizontal pipe. After wastewater treatment and sedimentation, the solenoid valve on the horizontal pipe is opened, allowing the treated clean water to flow into filter tank 1. Multiple pipes and pumps are installed in the pipe cavity 3. These pipes and pumps constitute a reflux system, a sewage discharge system, and an aeration system. The reflux system is equipped with a reflux pipe. One end of the pipe is connected to the upper space of the treatment tank 1, and the other end is connected to the lower space of the treatment tank 1. A reflux pump is installed in the middle. Therefore, when the reflux pump is started, the water in the upper part of the treatment tank 1 can flow along the reflux pipe and then be pumped out from the lower part of the treatment tank. The sewage discharge system includes sewage branch pipes installed at the bottom of the treatment tank 1 and the filter tank 2 respectively. The sewage branch pipes are connected to the main sewage discharge pipe respectively. A shut-off valve is installed on each sewage branch pipe, which can independently control the discharge of sludge in the treatment tank 1 and the filter tank 2 to the external space.

[0027] The aeration system is equipped with aeration pipes and aeration blowers installed on the aeration pipes. One end of the aeration pipes is connected to the aeration device 4 in the treatment tank 1. It is also equipped with a foam discharge outlet 11 and a discharge pipe.

[0028] like Figure 2 , Figure 3 , Figure 4 As shown, the aeration device 4 is located in the lower space of the treatment tank 1, but at the upper end of the conical bottom. The aeration device 4 includes an air supply pipe 41 and a pusher 42. The air supply pipe 41 is a ring structure with rounded corners and is connected to the aeration pipe in the pipe cavity 3 via an air inlet pipe 43. The pusher 42 is connected downward at the center of each of the four sides.

[0029] Water pusher 42 Figure 5 , Figure 6 , Figure 7 The bell jar 422 is a cylindrical shell structure with openings at the top and bottom. The bell jar 422 is a channel structure with openings at the top and bottom. A mounting plate 424 is welded to the upper end of the bell jar 422. The mounting plate 424 includes a fixing ring 4241 with an outer ring structure. The outer diameter of the fixing ring 4241 is the same as the inner diameter of the bell jar 422. Therefore, the fixing ring 4241 is inserted into the bell jar for welding. The middle part of the mounting plate 424 is hollowed out. A cross support member 4242 is welded to the inner wall of the fixing ring 4241. In order to ensure welding stability, the cross support member 4242 includes a rod part and a connector part, which are integral structures. The cross support member 4242 is connected to the fixing ring 4241 by the connector. The width of the connector is greater than the width of the rod of the cross support member 4242. In order to fit the inner wall of the fixing ring 4241, the outer contour of the connector is arc-shaped, and the arc is the same as the inner arc of the fixing ring 4241.

[0030] A connecting platform 4243 is provided at the cross intersection of the cross support member 4242. The outer contour of the connecting platform 4243 is cylindrical, and the middle part is an aeration channel, so that air can pass through the connecting platform 4243 and enter the interior of the bell jar 422. A threaded hole is provided on the upper end face of the connecting platform 4243.

[0031] A gas inlet pipe 421 is connected to the top of the bell jar 422. The gas inlet pipe 421 is a stainless steel pipe. A connecting plate with a diameter larger than the gas inlet pipe 421 is welded to the lower end of the gas inlet pipe 421. The connecting plate has a circular cross-section and an inner diameter that is the same as that of the gas inlet pipe 421. The connecting plate is also provided with threaded holes. Therefore, the connecting plate can be fitted to the upper end face of the connecting platform 4243 and the threaded holes on both can be aligned. The gas inlet pipe 421 and the connecting platform 4243 are fixedly connected with bolts, and then the gas inlet pipe 421 is fixedly connected with the fixing ring 4241.

[0032] Inside the bell jar 422, there is a pusher blade 425 that generates downward thrust. The shaft of the pusher blade 425 coincides with the central axis of the bell jar 422. The upper end of the pusher blade 425 shaft extends into the aeration channel and is welded to the inner wall of the aeration channel using a support rod. Because of the support rod, there is an airflow channel between the aeration channel and the pusher blade 425. To ensure the rotation of the pusher blade 425, one end of the support rod is welded to the inner wall of the aeration channel, and the other end is welded to a rotating shaft fixing ring 4244. A ball bearing is provided between the pusher blade 425 shaft and the rotating shaft fixing ring 4244 to form a rotatable connection, so it can rotate relative to the bell jar 422. The pusher blade 425 is keyed to the pusher blade 425 shaft, so the pusher blade 425 can rotate along with the pusher blade 425 shaft.

[0033] The upper end of the drive fan blade 425 shaft is connected to the aeration channel, and the lower end is rotatably connected to the conical guide platform 423. The conical guide platform 423 is a conical shell formed of sheet metal, and a rotary motor that drives the drive fan blade 425 to rotate is installed inside. The output shaft of the rotary motor passes through the upper end face of the conical platform 423 and is connected to the rotating shaft by a coupling. Furthermore, the part of the conical guide platform 423 through which the output shaft of the rotary motor passes is rotary sealed with a sealed bearing to ensure that no water can leak into the interior of the conical guide platform 423.

[0034] The microbial self-flocculating particles 5 are granular bacterial clusters of anaerobic ammonia-oxidizing bacteria, which are cultivated using the ECIS wastewater treatment device of this application. Before the application is put into operation, the microbial self-flocculating particles 5 are cultivated first, and then put into use after the cultivation is completed.

[0035] Before cultivation, the wastewater to be treated in the later stage needs to be introduced into this application and inoculated with oxyammonia-oxidizing bacteria for cultivation. When the microorganisms are cultivated from the flocculent particles, the device of this application only performs electrolysis and electroflocculation once. After electrolysis and electroflocculation are completed, formal cultivation begins. A small cultivation cycle consists of four stages: water inlet, aeration, sedimentation and drainage. After drainage is completed, water is introduced again to enter the next small cycle. Four small cycles are completed every day. The entire cultivation process takes one month.

[0036] Inlet water: Wastewater enters the treatment tank 1 through the inlet pipe of this application and needs to fill the entire treatment tank 1.

[0037] Aeration: Start aeration device 4 to begin aeration cultivation. The apparent air velocity of the aeration intensity should not be less than 1.2 cm / s; the aeration time is 4.5-5 hours.

[0038] Sedimentation: During the cultivation process, the sedimentation time needs to be continuously shortened to increase the biological selection pressure. The sedimentation time was shortened from 30 min in the first week, 25 min in the second week, 20 min in the third week, and 15 min in the fourth week. Shortening the sedimentation time can screen for microbial self-flocculating particles with good sedimentation performance.

[0039] Drainage: Since a horizontal pipe is provided in the middle of the treatment tank of this application, the volume exchange rate can be guaranteed to be about 50% during drainage.

[0040] After the culture was completed, 5 microbial self-flocculating particles were obtained. Specific Implementation

[0042] After the wastewater enters the tank and submerges electrode assembly 6, it continues to operate while the reflux system is activated. This allows the water in the treatment tank to flow vertically, ensuring sufficient contact between the water and electrode assembly 6 for optimal electrolysis. By controlling the pulse voltage and frequency of electrode assembly 6, the iron electrode within it is energized. Under this voltage, large oil molecules in the water break down, forming smaller organic and inorganic molecules. The smaller organic molecules serve as the carbon source for the biochemical stage, while the inorganic molecules solidify phosphorus in the wastewater, achieving phosphorus removal. The energized iron electrode generates heat, which heats the water, facilitating the subsequent reaction between microorganisms and the water in the biochemical stage. During the biochemical treatment stage, below 15°C, the microorganisms attached to the microbial carrier remain dormant, while their activity peaks at around 25°C.

[0043] Anaerobic stage in biological treatment: After the wastewater electrolysis is completed, the reflux system is shut off, allowing the wastewater in the entire treatment tank 1 to settle, with some of the sediment settling.

[0044] The anoxic phase in the biological treatment: The aeration system and the return system are turned on. The aeration blower operates in a 5-minute on-10-minute off mode, with the apparent air velocity of the aeration intensity controlled at 0.6-4 cm / s. Simultaneously, the return pump of the return system operates continuously, pumping the nitrified liquid in the middle back to the bottom of the tank. Because the aeration device 4 aerates downwards and is equipped with a pusher 42, the sediment and sludge cannot cover the aeration device, ensuring smooth aeration. With each aeration, the dissolved oxygen content in the wastewater increases, and during the aeration interval, the dissolved oxygen content gradually decreases, thus maintaining an anoxic phase for 1 hour.

[0045] The aerobic stage of the biochemical treatment: the aeration blower and the reflux system are continuously turned on. The reflux system extracts the nitrified liquid in the middle and pumps it out from the bottom of the treatment tank to achieve the effect of agitation and stirring. This allows the microorganisms in the water to fully contact the flocculated particles with oxygen and uses the shear force of aeration to remove the filamentous bacteria on the surface of the particles, preventing the excessive proliferation of filamentous bacteria on the particle surface and damage to the particle structure. This aerobic stage lasts for 80 minutes.

[0046] Electroflocculation stage: After the aerobic stage is completed, the aeration blower is turned off, the electrode assembly 11 is turned on, and the pulse voltage and frequency are controlled to make the aluminum electrode in the electrode assembly 11 energized. The aluminum electrode releases aluminum ions during operation. The aluminum ions adsorb pollutants in the water and flocculate and precipitate. After the electroflocculation stage is completed, the return system is turned off to allow the sewage to settle. Settling can be completed in just 15 minutes. After a short settling time, drainage begins. At this time, the granular sludge has settled, but the filamentous bacteria that have been sheared do not have time to settle and are discharged with the water. Therefore, the process is an ethanol screening of the sedimentation speed of microbial particles. As the operating time cycle is extended, the sedimentation time can be further shortened to within 15 minutes.

[0047] Filtration stage: After settling, the wastewater and the supernatant are introduced into the filter tank 2 through the horizontal pipe in the middle of the treatment tank 1. The stainless steel fine filter component filters the wastewater, filtering out flocculants and sediments in the filter tank 2. The clean water is discharged from the inside of the fine filter component to the clean water drain pipe, and then passes through the tubular ultraviolet sterilizer to complete the entire wastewater treatment process.

[0048] The iron electrode is chosen for electrolysis because it is more effective at removing phosphorus than the aluminum electrode. Electrolysis of iron provides better phosphorus removal, while aluminum is used for flocculation. Traditionally, aluminum and iron are the most commonly used anode materials for electrocoagulation. Numerous scientific studies have shown that aluminum electrodes offer better flocculation, while iron electrodes are more economical. Therefore, aluminum anodes are often used in drinking water treatment, while iron anodes are primarily used for treating various industrial wastewater and domestic sewage. This solution utilizes both in wastewater treatment.

[0049] After a batch of sewage is treated, the sludge at the bottom of the treatment tank 1 and the filter tank 2 is discharged through the sewage branch pipes at the bottom, and the sludge and foam are discharged together to the outside of the entire sewage treatment device.

[0050] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A fully aerated ECIS wastewater treatment device, comprising a treatment tank, a filtration tank, and a discharge system arranged sequentially; the treatment tank is equipped with a physicochemical-biological treatment unit, in which wastewater undergoes a physicochemical-biological treatment process for nitrogen and phosphorus removal, the physicochemical-biological treatment unit comprising an electrode assembly, an aeration system, and a reflux system; characterized in that: The treatment tank contains microbial self-flocculating particles; the aeration system includes an independently controllable aeration device located at the bottom of the treatment tank. The aeration device includes an air inlet pipe and a pusher that generates a shear force field by pushing the gas downwards, which contacts the sludge and maintains the stability of the microbial self-flocculating particles. The pusher includes a bell-shaped jar with openings at the top and bottom. The air inlet pipe is connected to the bell-shaped jar but does not close the openings. Pusher blades are provided inside the bell-shaped jar. A conical guide platform is connected to the lower end of the bell-shaped jar. The bottom of the treatment tank is conical with an inclination angle greater than 55 degrees.

2. The ECIS wastewater treatment device capable of achieving full aeration according to claim 1, characterized in that: The microbial self-flocculating particles are granular sludge from anaerobic ammonia-oxidizing bacteria.

3. The ECIS wastewater treatment device capable of achieving full aeration according to claim 1, characterized in that: The air intake pipe is connected to the air delivery pipe, which has a ring structure.

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