An activated sludge micro-particle separation device for sewage treatment

Abstract

The utility model discloses an activated sludge microgranule separation device for sewage treatment, which comprises an activated sludge tank, a pulse air stripping device, a rotary microfiltration separation device, an intermediate tank, a diaphragm pump and a rotary microgranule separation device. The pulse air stripping device is arranged in the activated sludge tank. The outlet of the air stripping device is connected to the liquid-solid inlet of the rotary microfiltration separation device. The liquid-solid outlet of the rotary microfiltration separation device is connected to the intermediate tank. The sludge residue outlet is connected to the sludge tank. The inlet end of the diaphragm pump is connected to the intermediate tank through a pipeline. The outlet end is connected to the rotary microgranule separation device through a pipeline. The middle and lower parts of the rotary microgranule separation device are conical. The side end is provided with an inlet, and the inlet direction is tangent to the inner wall. The bottom is provided with a granular organic bacteria outlet for heavy phase. The top is provided with an inorganic sludge residue outlet for light phase. The utility model can effectively separate and recycle the light, loose, sludge, aging bacteria and fine sludge in the biochemical tank, and can screen and retain high-quality bacteria, thereby improving the quality of the activated sludge.

Description

Technical Field

[0001] This utility model relates to an activated sludge microparticle separation device for wastewater treatment, belonging to the field of wastewater treatment technology. Background Technology

[0002] The activated sludge process, developed since the early 20th century, has become a core technology for industrial and municipal wastewater treatment globally, and its application is currently widespread. The activated sludge process and its modified versions account for over 90% of AAO, oxidation ditch, and SBR processes, and its adaptive applications in industrial wastewater treatment account for approximately 70%–80%. The activated sludge process is also commonly used in food processing, pharmaceuticals, chemicals, and electronics industries. Through strain optimization and parameter adjustments (such as sludge age and loading rate), it addresses complex water qualities such as high organic matter and toxic substances; high-load activated sludge processes are used to rapidly degrade organic matter in food wastewater.

[0003] Although the activated sludge process is a mature and reliable technology, there are still challenges to overcome in order to increase sludge concentration, volumetric loading, extend sludge age, and achieve high removal rates and sludge reduction. Operating under high sludge loads and fluctuating influent wastewater concentrations can impact the activated sludge bacteria in the biological treatment tank, leading to operational abnormalities, sludge bulking, floating sludge, poor settling properties, and mismatches between aeration and oxygenation levels and wastewater organic and ammonia nitrogen concentrations. To quickly restore normal treatment, excess sludge is typically obtained from municipal wastewater treatment plants. However, this process suffers from long replenishment times, low efficiency, and extended recovery times for the biological treatment system, affecting its normal operation. Furthermore, each sludge replenishment requires the construction of temporary dosing equipment (such as tarpaulins, excavators, cranes, and sludge hoppers), resulting in high labor costs, low operational efficiency, and a poor operating environment.

[0004] Therefore, in order to effectively and quickly solve the problem of normal operation, we developed an activated sludge microparticle separation device for the activated sludge process in wastewater treatment. Summary of the Invention

[0005] The purpose of this invention is to provide an activated sludge microparticle separation device for sewage treatment, which is used to separate and recycle light, loose, fine, and aged sludge in biological treatment tanks, screen and retain high-quality bacteria, and improve removal efficiency.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an activated sludge microparticle separation device for wastewater treatment, comprising an activated sludge tank, a mobile pulse airlift device, a rotary microfiltration device, an intermediate tank, a diaphragm pump, and a rotary microparticle separation device. The activated sludge tank is equipped with a mobile pulse airlift device, the outlet of which is connected to the liquid-solid inlet of the rotary microfiltration device. The rotary microfiltration device is used to separate particles, suspended solids, and inorganic dead sludge in the activated sludge. It has two outlets, a liquid-solid outlet and a sludge outlet. The liquid-solid outlet is connected to the intermediate tank, and the sludge outlet is connected to the sludge tank. The inlet end of the diaphragm pump is connected to the intermediate tank through a pipe, and the outlet end is connected to the rotary microparticle separation device through a pipe. The lower middle part of the rotary microparticle separation device is conical, with an inlet on the side end and the inlet direction being tangent to the inner wall. The bottom has a heavy phase granular organic bacteria outlet, and the top has a light phase inorganic sludge outlet.

[0007] As a further preferred embodiment of this scheme, the outlet of the particulate organic bacteria in the cyclone separation device is connected to the activated sludge tank via a pipeline, the outlet of the inorganic sludge is connected to the buffer tank via a pipeline, and the outlet of the buffer tank is connected to the sludge tank via a pipeline.

[0008] As a further preferred embodiment of this solution, the rotary microfiltration separation device includes a housing, a separation drum, and a reduction drive mechanism. The separation drum is rotatably disposed within the housing, with one end connected to the liquid-solid inlet and the other end connected to the sludge outlet. Simultaneously, the separation drum is driven to rotate by the reduction drive mechanism.

[0009] As a further preferred embodiment of this solution, the separating drum includes a rotating cylinder and a spiral structure disposed inside the rotating cylinder. The surface of the rotating cylinder is provided with filter holes, and the bottom of the box below the rotating cylinder is provided with a liquid-solid outlet. The rotating cylinder separates inorganic substances from the mud and water inside it during rotation.

[0010] As a further preferred embodiment of this solution, the intermediate tank is equipped with a liquid level controller, which interlocks the start and stop of the diaphragm pump according to the high and low liquid levels.

[0011] The beneficial effects of this invention are: this device effectively separates light, loose, fine, aging bacteria, metabolic bacteria and dead sludge from activated sludge in biological treatment tanks; it can screen slow-growing plant bacteria, prevent fast-growing bacteria from becoming dominant, retain a certain amount of high-quality plant bacteria, improve removal efficiency, and thus improve the quality of activated sludge. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2This is a schematic diagram of the rotary microfiltration separation device of this utility model.

[0014] Figure 3 This is a schematic diagram of the separation drum structure of this utility model.

[0015] The diagram is labeled as follows: 1-Activated sludge tank, 2-Mobile pulse airlift device, 3-Rotary microfiltration separation device, 31-Box body, 32-Separation drum, 33-Reduction drive mechanism, 34-Liquid-solid inlet, 35-Liquid-solid outlet, 36-Sludge outlet, 37-Flushing pipe, 4-Intermediate tank, 5-Diaphragm pump, 6-Rotary microparticle separation device, 7-Buffer tank. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] like Figure 1 As shown, an activated sludge microparticle separation device for wastewater treatment includes an activated sludge tank 1, a mobile pulse airlift device 2, a rotary microfiltration device 3, an intermediate tank 4, a diaphragm pump 5, and a rotary microparticle separation device 6. The activated sludge tank is equipped with the mobile pulse airlift device 2, the outlet of which is connected to the liquid-solid inlet 34 of the rotary microfiltration device 3. The rotary microfiltration device 3 is used to separate particles ≥3mm, suspended solids, and inorganic dead sludge from the activated sludge, and has two outlets: a liquid-solid outlet 35 and a sludge outlet 36. The sludge outlet 36 and the liquid-solid outlet are connected to the intermediate tank 4. The sludge outlet 36 is connected to the sludge tank. The inlet end of the diaphragm pump is connected to the intermediate tank 4 through a pipeline, and the outlet end is connected to the cyclone separator 6 through a pipeline. The lower middle part of the cyclone separator 6 is conical, with an inlet on the side end and the inlet direction is tangent to the inner wall. The bottom is provided with a heavy phase granular organic bacteria outlet, and the top is provided with a light phase inorganic sludge outlet. The granular organic bacteria outlet is connected to the activated sludge tank through a pipeline, and the inorganic sludge outlet is connected to the buffer tank 7 through a pipeline. The outlet of the buffer tank 7 is connected to the sludge tank through a pipeline.

[0018] like Figure 2 As shown, the rotary microfiltration separation device includes a housing 31, a separation drum 32, and a reduction drive mechanism 33. The separation drum 32 is rotatably installed inside the housing. One end of the separation drum 32 is connected to the liquid-solid inlet 34, and the other end is connected to the sludge outlet 36. At the same time, the separation drum is driven to rotate by the reduction drive mechanism 33.

[0019] In this embodiment, the separating drum 32 includes a rotating cylinder and a spiral structure disposed inside the rotating cylinder. The surface of the rotating cylinder is provided with filter holes, and the bottom of the box below the rotating cylinder is provided with a liquid-solid outlet 35. The rotating cylinder separates the sludge inside it during rotation.

[0020] In this embodiment, the intermediate tank is equipped with a level controller, which interlocks the start and stop of the diaphragm pump according to the liquid level.

[0021] The working principle of this device is as follows: The mobile pulse airlift device lifts activated sludge and other sludge into the rotary microfiltration separator. When floating, suspended, fibrous, and sandy substances in the wastewater, or large particles and dead sediment contained in the activated sludge, enter the rotary microfiltration separator, the separation drum is driven by a reducer to separate the sludge-water mixture inside. Liquid-solid mixtures smaller than 3mm pass through the filter holes and are discharged into the intermediate tank through the liquid-solid outlet. Other sludge and other materials are rotated and thrown into the spiral structure to the sludge outlet and discharged into the sludge tank. Then, the diaphragm pump lifts the liquid-solid mixture from the intermediate tank to the cyclone separator inlet of the cyclone separator. The feeding method is tangential feeding. Then, the mixed fluid (containing suspended particles or fluids of different densities) enters the upper part of the cyclone separator tangentially under pressure. Heavy phase / large particles are thrown against the wall of the cyclone separator under strong centrifugal force and move downward with the cyclone to the bottom outlet for discharge (dense phase / coarse particle activated sludge). Aged bacteria, light, loose, fine and suspended particles are thrown upward through pipes to the buffer tank by centrifugal force. The bottom of the buffer tank has a sludge outlet and discharges to the sludge collection tank. In this way, slow-growing plant bacteria are screened by cyclone separation, preventing fast-growing bacteria from becoming dominant, accumulating and safely retaining a certain amount of plant bacteria, thereby improving the quality of activated sludge.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit the scope of protection of this utility model in any way, and all technical solutions obtained by equivalent substitution or other means fall within the scope of protection of this utility model. Parts not covered by this utility model are the same as or can be implemented using existing technology.

Claims

1. An activated sludge microparticle separation device for wastewater treatment, characterized in that, The system includes an activated sludge tank, a mobile pulse jet lift device, a rotary microfiltration separation device, an intermediate tank, a diaphragm pump, and a vortex microparticle separator. The activated sludge tank is equipped with a mobile pulse jet lift device, the outlet of which is connected to the liquid-solid inlet of the rotary microfiltration separation device. The rotary microfiltration separation device is used to separate particles, suspended solids, and inorganic dead sludge from the activated sludge. It has two outlets: a liquid-solid outlet and a sludge outlet. The liquid-solid outlet is connected to the intermediate tank, and the sludge outlet is connected to the sludge tank. The inlet of the diaphragm pump is connected to the intermediate tank via a pipeline, and the outlet is connected to the vortex microparticle separator via a pipeline. The lower part of the vortex microparticle separator is conical, with an inlet on the side that is tangent to the inner wall. The bottom has an outlet for heavy phase granular organic bacteria, and the top has an outlet for light phase inorganic sludge.

2. The activated sludge microparticle separation device for wastewater treatment according to claim 1, characterized in that, The granular organic bacteria outlet of the cyclone separator is connected to the activated sludge tank via a pipeline, the inorganic sludge outlet is connected to the buffer tank via a pipeline, and the outlet of the buffer tank is connected to the sludge tank via a pipeline.

3. The activated sludge microparticle separation device for wastewater treatment according to claim 1, characterized in that, The rotary microfiltration separation device includes a housing, a separation drum, and a reduction drive mechanism. The separation drum is rotatably installed inside the housing. One end of the separation drum is connected to the liquid-solid inlet, and the other end is connected to the sludge outlet. The separation drum is driven to rotate by the reduction drive mechanism.

4. The activated sludge microparticle separation device for wastewater treatment according to claim 3, characterized in that, The separating drum includes a rotating cylinder and a spiral structure disposed inside the rotating cylinder. The surface of the rotating cylinder is provided with filter holes, and the bottom of the box below the rotating cylinder is provided with a liquid-solid outlet. The rotating cylinder separates inorganic substances from the mud and water inside it during rotation.

5. The activated sludge microparticle separation device for wastewater treatment according to claim 1, characterized in that, The intermediate tank is equipped with a level controller, which interlocks the start and stop of the diaphragm pump according to the high and low liquid levels.

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