Anaerobic ammonia oxidation reactor capable of realizing biomass interception

Abstract

The anaerobic ammonia oxidation reactor comprises an automatic control system and a reaction area, the automatic control system comprises an electromagnetic valve and a liquid level floating ball switch, a water inlet is formed in the bottom of the reaction area, a porous water outlet pipe is arranged at the top of the reaction area, and a water outlet pipe is arranged at the bottom of the reaction area. The porous water outlet pipe is connected with a drain pipe outside the reaction area, a manhole and a hand hole are formed outside the reaction area, a biomass interception system is arranged inside the reaction area, and the biomass interception system is composed of a lower filter plate and an upper filter plate. According to the utility model, the granular sludge settled in the reaction area can be intercepted, the granular sludge is prevented from settling to the water inlet, the blockage of the water inlet is avoided, and the inflow water passes through the holes and the filter caps of the lower filter plate, so that the inflow water flow is distributed in a balanced manner and flows upwards; dead zones and local aggregation do not exist, so that inlet water is ensured to be in uniform contact with biomass in the reactor, and the mass transfer efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of biological denitrification of wastewater, specifically an anaerobic ammonia oxidation reactor that can achieve in-situ biomass retention. Background Technology

[0002] Nitrogen removal from urban wastewater mainly relies on biological denitrification processes. Traditional biological denitrification technologies mainly depend on nitrification and denitrification processes, which convert ammonia nitrogen into nitrite and nitrate, and then into nitrogen gas to achieve denitrification. However, this process has drawbacks such as high energy consumption and operating costs, long process flow, large sludge production, and sensitivity to environmental conditions.

[0003] Anaerobic ammonia oxidation technology can directly convert ammonia nitrogen and nitrite into nitrogen gas through anaerobic ammonia oxidizing bacteria under anaerobic conditions, offering advantages such as low energy consumption, low operating costs, and low sludge production. However, the growth rate of anaerobic ammonia oxidizing bacteria is slow, with a long doubling time. Furthermore, the loss of biomass in the reactor reduces treatment efficiency and further prolongs the reactor start-up time.

[0004] In practical engineering, biomass is retained by connecting an external membrane filtration system at the effluent end and then reused in the reactor. However, membrane fouling is unavoidable and requires regular cleaning and maintenance, which increases operating costs. Therefore, developing an anaerobic ammonia oxidation reactor that can retain biomass in situ remains a problem to be solved. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an anaerobic ammonia oxidation reactor capable of biomass retention, thus solving the problems mentioned in the background section.

[0006] This utility model provides the following technical solution: an anaerobic ammonia oxidation reactor capable of biomass retention, comprising an automatic control system and a reaction zone. The automatic control system includes a solenoid valve and a liquid level float switch. An inlet is provided at the bottom of the reaction zone, and a perforated outlet pipe is provided at the top of the reaction zone. The perforated outlet pipe is connected to an external drainage pipe of the reaction zone. A manhole and a handhole are provided outside the reaction zone. The feature is that a biomass retention system is provided inside the reaction zone. The biomass retention system consists of a lower filter plate and an upper filter plate. The lower filter plate is installed at the bottom of the reaction zone, higher than the inlet, and the upper filter plate is installed at the top of the reaction zone, lower than the perforated outlet pipe.

[0007] Preferably, the biomass retention system consists of a lower filter plate and an upper filter plate, both made of stainless steel to prevent deformation due to excessive pressure during use.

[0008] Specifically, the lower and upper filter plates are filled with holes and filter caps, which not only achieve uniform distribution of the influent and improve mass transfer efficiency, but also trap the settled and floating particulate sludge, avoiding clogging of the influent and loss of biomass, while the effluent flows out continuously and stably.

[0009] Preferably, the pores are evenly distributed on the filter plate and have a diameter of 0.5 mm, which is smaller than that of anaerobic ammonia oxidation granular sludge, thus preventing the passage of granular sludge.

[0010] Preferably, the filter cap is a short-handled filter cap, which is alternately distributed with the holes, and is made of ABS engineering plastic, which has high compressive strength and large specific gap area.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The lower filter plate in this utility model can trap the granular sludge that settles in the reaction zone, preventing the granular sludge from settling at the inlet and avoiding blockage of the inlet. The water flows through the holes and filter cap of the lower filter plate, so that the water flow is evenly distributed and flows upward, without dead zones or local accumulation, ensuring that the water is in uniform contact with the biomass in the reactor and improving the mass transfer efficiency.

[0013] 2. The upper filter plate in this utility model can trap the floating granular sludge in the reaction zone, preventing the floating granular sludge from flowing out with the effluent and causing the loss of biomass, thus shortening the reactor start-up time, while the effluent flows out continuously and stably through the holes and filter cap of the upper filter plate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0015] In the diagram: 1. Solenoid valve; 2. Liquid level float switch; 3. Multi-hole outlet pipe; 4. Drain pipe; 5. Inlet; 6. Lower filter plate; 7. Reaction zone; 8. Upper filter plate; 9. Hole; 10. Filter cap; 11. Manhole; 12. Handhole. Detailed Implementation

[0016] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings: These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0017] Please see Figure 1An anaerobic ammonia oxidation reactor capable of biomass retention includes an automatic control system and a reaction zone 7. The automatic control system includes a solenoid valve 1 and a liquid level float switch 2. An inlet 5 is provided at the bottom of the reaction zone 7, and a perforated outlet pipe 3 is provided at the top of the reaction zone 7. The perforated outlet pipe 3 is connected to an external drainage pipe 4 of the reaction zone 7. A manhole 11 and a handhole 12 are provided on the outside of the reaction zone 7. A biomass retention system is provided inside the reaction zone 7. The biomass retention system consists of a lower filter plate 6 and an upper filter plate 8. The lower filter plate 6 is installed at the bottom of the reaction zone 7, higher than the inlet 5, and the upper filter plate 8 is installed at the top of the reaction zone 7, lower than the perforated outlet pipe 3.

[0018] The biomass retention system consists of a lower filter plate 6 and an upper filter plate 8, both made of stainless steel to prevent deformation due to excessive pressure during use. The lower and upper filter plates 6 and 8 are perforated with holes 9 and filter caps 10. This ensures uniform distribution of the influent, improving mass transfer efficiency, while simultaneously trapping settled and floating particulate sludge, preventing clogging of the inlet 5 and biomass loss, while ensuring a continuous and stable effluent flow. The holes 9, evenly distributed on the filter plates, are 0.5 mm in diameter, restricting the escape of particulate sludge from the holes 9 and preventing clogging of the inlet 5 and biomass loss. The filter caps 10 are short-handled caps, alternating with the holes 9, made of ABS engineering plastic, offering high compressive strength and a large specific area.

[0019] Working principle: During use, the water entering the reaction zone 7 passes through the holes 9 and filter cap 10 of the lower filter plate 6. The water flow is evenly distributed and flows upward without local accumulation or lack, ensuring that the water enters the reaction zone 7 in uniform contact with the biomass, thus improving mass transfer efficiency. The settled granular sludge is intercepted by the lower filter plate 6 and returns to the reaction zone 7 under the action of the water flow. At the same time, the upper filter plate 8 intercepts the floating granular sludge and allows it to return to the reaction zone 7 under the action of gravity, maintaining the stability of the biomass content in the reaction zone 7. The holes 9 and filter cap 10 of the upper filter plate 8 allow the effluent from the reaction zone 7 to pass through, so that the effluent is discharged continuously and evenly.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An anaerobic ammonia oxidation reactor capable of biomass retention, comprising an automatic control system and a reaction zone (7), wherein the automatic control system comprises a solenoid valve (1) and a liquid level float switch (2), an inlet (5) is provided at the bottom of the reaction zone (7), a perforated outlet pipe (3) is provided at the top of the reaction zone (7), the perforated outlet pipe (3) is connected to an external drain pipe (4) of the reaction zone (7), and a manhole (11) and a handhole (12) are provided outside the reaction zone (7), characterized in that: The reaction zone (7) is equipped with a biomass interception system, which consists of a lower filter plate (6) and an upper filter plate (8). The lower filter plate (6) is installed at the lower part of the reaction zone (7) and is higher than the inlet (5). The upper filter plate (8) is installed at the upper part of the reaction zone (7) and is lower than the porous outlet pipe (3).

2. The anaerobic ammonia oxidation reactor capable of biomass retention according to claim 1, characterized in that: The lower filter plate (6) and the upper filter plate (8) are filled with holes (9) and filter caps (10).

3. The anaerobic ammonia oxidation reactor capable of biomass retention according to claim 2, characterized in that: The holes (9) are evenly distributed on the filter plate and have a diameter of 0.5 mm.

4. An anaerobic ammonia oxidation reactor capable of biomass retention according to claim 2, characterized in that: The filter cap (10) is a short-handled filter cap, which is alternately distributed with the holes (9).

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