A continuous flow zeolite fluidized bed nitrosation reactor

Abstract

The utility model belongs to wastewater treatment technical field discloses a continuous flow zeolite fluidized bed nitrosation reactor. Including reactor body, water inlet system, aeration system, water outlet system and sludge discharge system, the water inlet system includes water inlet pipeline and flow regulating valve, the aeration system includes aeration device, micropore aerator, aeration pipeline and gas flow regulating valve, the micropore aerator is evenly distributed in the reactor body, the reactor body top is provided with the expansion mouth, and the reactor body bottom is provided with the conical sedimentation zone, and the conical sedimentation zone bottom is provided with sludge discharge system, and the reactor body is filled with zeolite particle, the water outlet system includes water outlet pipeline and flow regulating valve, and one end of water outlet pipeline is connected at the overflow weir of expansion mouth. The utility model fluidized bed reactor has the advantages of good zeolite interception effect, high nitrosation rate, convenient sludge treatment and low operating cost, and has wide application prospect.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a continuous flow zeolite fluidized bed nitrification reactor. Background Technology

[0002] With rapid industrialization and urbanization, ammonia nitrogen pollution has become one of the most serious challenges facing the water environment. Traditional biological nitrogen removal processes suffer from low efficiency, high energy consumption, and large land area requirements when treating low-concentration ammonia nitrogen wastewater. In recent years, zeolite-based biological nitrogen removal technology has attracted widespread attention due to its advantages such as high efficiency, stability, and economy.

[0003] Zeolite is a natural or synthetic aluminosilicate mineral with a unique porous structure and cation exchange capacity, exhibiting a strong adsorption effect on ammonia nitrogen. Applying zeolite to biological nitrogen removal processes can effectively improve ammonia nitrogen removal efficiency and reduce operating costs. However, traditional zeolite-based biological nitrogen removal processes still have some problems, such as:

[0004] 1. Zeolite is easily lost: Zeolite particles are easily lost with the water flow in the reactor, which leads to increased operating costs.

[0005] 2. Low nitrification rate: In traditional processes, the activity of nitrifying bacteria is difficult to maintain, resulting in a low nitrification rate, which affects the subsequent denitrification effect.

[0006] 3. Difficulty in sludge treatment: The flocculent biochemical sludge generated in the reactor is difficult to separate and treat, which can easily cause secondary pollution.

[0007] To overcome the above problems, developing a reactor that is not prone to zeolite loss, has a high nitrification rate, and allows for easy sludge separation for treating low-concentration ammonia nitrogen wastewater has become a pressing technical problem in this field. Utility Model Content

[0008] The purpose of this invention is to provide a continuous flow zeolite fluidized bed nitrification reactor to solve the problems of easy zeolite loss, low nitrification rate, and difficult sludge treatment in the existing technology.

[0009] The technical solution of this utility model is as follows:

[0010] A continuous flow zeolite fluidized bed nitrification reactor includes a reactor body, an influent system, an aeration system, an effluent system, and a sludge removal system;

[0011] The water inlet system includes an inlet pipe (1) and a first flow regulating valve (9). One end of the inlet pipe (1) is connected to the bottom of the outer side of the reactor body (8) and communicates with the reactor body (8), and the other end is connected to the wastewater source. The first flow regulating valve (9) is installed on the inlet pipe (1).

[0012] The aeration system includes an aeration device (3), a microporous aerator (10), an aeration pipe (11), and a gas flow regulating valve (12). The aeration device (3) is located at the bottom outside the reactor body (8) and is connected to the aeration pipe (11) inside the reactor body. The aeration pipe (11) is equipped with a microporous aerator (10), which is evenly distributed in the reactor body (8). The gas flow regulating valve (12) is located on the aeration pipe (11).

[0013] The reactor body (8) is provided with an enlarged opening (5) at the top, which is connected to the reactor body (8). The reactor body (8) is provided with a conical sedimentation zone (2) at the bottom, with the top opening of the conical sedimentation zone (2) directly connected to the bottom of the reactor body (8). The bottom of the conical sedimentation zone (2) is provided with a sludge discharge system, where sludge particles (7) settle and accumulate at the bottom of the conical sedimentation zone (2) and are discharged through the sludge discharge system. The reactor body (8) is filled with zeolite particles (4).

[0014] The water outlet system includes a water outlet pipe (6) and a second flow regulating valve (13). One end of the water outlet pipe (6) is connected to the overflow weir of the enlarged port (5), and the second flow regulating valve (13) is installed on the water outlet pipe (6).

[0015] Preferably, the reactor body (8) is a cuboid or cube, and the aspect ratio of the reactor body (8) is 1:1 to 2:1.

[0016] Preferably, the water inlet system and the aeration system are respectively located on both sides of the long side of the reactor body (8). Preferably, the particle size of the zeolite particles is 0.5-2 mm.

[0017] Preferably, the length of the enlarged opening (5) is 1.2-2 times the width of the reactor body, and the length-to-width ratio of the enlarged opening is 2:1 to 3:1.

[0018] Preferably, the cone angle of the cone-shaped sedimentation zone is 45°-75°.

[0019] Preferably, the conical sedimentation zone (2) is fixedly connected to the reactor body (8).

[0020] Preferably, the upper part of the enlarged opening (5) is provided with a laminar flow sedimentation zone (14).

[0021] The working principle of this utility model is as follows:

[0022] Wastewater enters the bottom of the reactor through the influent system. Under the action of the aeration system, the zeolite particles are in a fluidized state and fully contact the wastewater. The biofilm on the surface of the zeolite particles adsorbs ammonia nitrogen in the wastewater and converts it into nitrite. The treated effluent is discharged through the effluent system, while the zeolite particles settle to the bottom of the reactor due to gravity and participate in the reaction again. The flocculent biological sludge is periodically discharged through the sludge removal system.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0024] 1. Excellent zeolite retention: The enlarged opening or horizontal sedimentation zone at the top of the reactor can effectively retain zeolite particles and prevent them from being lost. The zeolite loss rate is ≤0.5%, which is much lower than that of traditional processes.

[0025] 2. High nitrification rate: The fluidized bed reactor provides a good growth environment for nitrifying bacteria, which is conducive to improving the nitrification rate, which can reach more than 85%.

[0026] 3. Convenient sludge treatment: Flocculent biochemical sludge can be discharged regularly through the sludge discharge system, which facilitates subsequent treatment and does not cause secondary pollution.

[0027] 4. Low operating cost: This utility model has a simple structure, is easy to operate, and has low operating cost. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the zeolite fluidized bed nitrification reactor of this utility model. 1-Inlet pipe; 2-Conical sedimentation zone; 3-Aeration device; 4-Zeolite particles; 5-Expanded opening; 6-Outlet pipe; 7-Sludge particles; 8-Reactor body; 9-First flow regulating valve; 10-Microporous aerator; 11-Aeration pipe; 12-Gas flow regulating valve; 13-Second flow regulating valve; 14-Horizontal sedimentation zone. Detailed Implementation

[0029] The present invention will be further described in detail below through specific embodiments. Unless otherwise specified, the raw materials, reagents, or apparatus used in the embodiments can be obtained from conventional commercial sources or by existing technical methods. Unless otherwise specified, the testing or experimental methods are conventional methods in the art.

[0030] The reactor of this invention includes a reactor body, an inlet system, an aeration system, an effluent system, and a sludge removal system. The inlet system is used to evenly distribute wastewater into the reactor, the aeration system is used to provide oxygen and maintain the fluidized state of the zeolite particles, the effluent system is used to remove the treated effluent, and the sludge removal system is used to periodically remove flocculent biological sludge.

[0031] The reactor body is either rectangular or cubic. A rectangular design can optimize water flow distribution and improve treatment efficiency, especially when treating large flow rates of wastewater. A square design simplifies the structure and facilitates installation and maintenance.

[0032] The first flow regulating valve (9) is installed on the water inlet pipe (1) to regulate the water inlet flow rate to adapt to different treatment needs and operating conditions.

[0033] The microporous aerator (10) is used to supply oxygen to the reactor and maintain the fluidization state of the zeolite particles by turbulence of the airflow, ensuring that the zeolite particles are in full contact with the ammonia nitrogen in the wastewater. The gas flow regulating valve (12) is installed on the aeration pipe (11) to regulate the aeration rate to adapt to different treatment needs and operating conditions.

[0034] An enlarged orifice is located at the top of the reactor body to trap zeolite particles and prevent their loss. The length of the orifice is 1.2-2 times the width of the reactor body. This proportional design ensures that zeolite particles have sufficient space to settle as water flows through, while avoiding short-circuiting of the water flow due to an excessively narrow orifice or excessively wide orifice resulting in an overly large equipment size. A horizontal flow sedimentation zone can also be provided at the top. The purpose of this zone is to further aid in the settling of zeolite particles through the smooth flow of water, thereby reducing zeolite loss. The horizontal flow sedimentation zone can serve as an auxiliary design to the enlarged orifice, further improving the zeolite trapping effect.

[0035] The cone angle of the cone sedimentation zone is 45°-75°. This angle range design ensures that the sludge can settle smoothly and accumulate at the bottom of the cone sedimentation zone, making it easy to discharge regularly through the sludge discharge system, while avoiding the accumulation or suspension of sludge in the cone sedimentation zone.

[0036] Example 1

[0037] Treatment of low-concentration ammonia nitrogen wastewater

[0038] Implementation Background:

[0039] A municipal wastewater treatment plant needs to treat domestic sewage containing low concentrations of ammonia nitrogen (10-20 mg / L). Traditional biological denitrification processes are inefficient and costly when treating this type of wastewater. Therefore, it was decided to use the continuous flow zeolite fluidized bed nitrification reactor of this invention for treatment.

[0040] Equipment Configuration

[0041] Reactor body: rectangular, with dimensions of 2 m × 1 m × 3 m (length × width × height).

[0042] Enlarged opening: The length is 1.5 times the width of the reactor body, i.e., 1.5 m, and the length-to-width ratio of the enlarged opening is 2:1 to 3:1.

[0043] Conical sedimentation zone: cone angle is 60°.

[0044] Water inlet system: The water inlet pipe is connected to the outlet of the sewage treatment plant, and the water distributor adopts a porous distribution plate, which is evenly distributed at the bottom of the reactor.

[0045] Aeration system: The aeration pipe is connected to the air compressor. Microporous aerators are installed on the aeration pipe. The microporous aerators are made of microporous ceramic plates and are evenly distributed inside the reactor. The gas flow regulating valve is installed on the aeration pipe.

[0046] Zeolite particles: particle size 1-2 mm, filling height 2 m.

[0047] Water outlet system: located at the overflow weir of the enlarged opening.

[0048] Sludge removal system: Regularly removes flocculent biochemical sludge.

[0049] Operating parameters:

[0050] Inlet flow rate: 10 m³ / h.

[0051] Aeration rate: 5 m³ / h.

[0052] Running time: 30 consecutive days.

[0053] Operation process:

[0054] Inlet water: Wastewater is evenly distributed to the bottom of the reactor through the inlet water system.

[0055] Aeration: The aeration system provides oxygen to maintain the fluidized state of the zeolite particles and promotes the nitrification reaction of ammonia nitrogen.

[0056] Reaction: The biofilm on the surface of zeolite particles adsorbs ammonia nitrogen in wastewater and converts it into nitrite.

[0057] Effluent: The treated effluent is discharged through an enlarged overflow weir.

[0058] Sludge removal: Flocculent biochemical sludge is periodically removed through the sludge removal system.

[0059] Processing effect

[0060] Zeolite retention effect: The design of the enlarged inlet and the advection sedimentation zone effectively retains zeolite particles. After 30 days of operation, the zeolite loss rate is only 0.5%, which is much lower than that of traditional processes (usually 5%-10%).

[0061] Nitrification efficiency: The activity of nitrifying bacteria in the reactor is high, the nitrification rate reaches more than 90%, the nitrite concentration in the effluent is 9-18 mg / L, and the ammonia nitrogen removal rate exceeds 90%.

[0062] Sludge treatment: Flocculent biochemical sludge is discharged regularly through a sludge discharge system, making sludge treatment convenient and preventing secondary pollution.

[0063] Example 2

[0064] Treatment of industrial wastewater with high concentration of ammonia nitrogen

[0065] Implementation Background:

[0066] The wastewater discharged from a chemical plant contains high concentrations of ammonia nitrogen (50-100 mg / L), requiring effective pretreatment to reduce the ammonia nitrogen concentration and lessen the burden on subsequent treatment processes. Traditional biological denitrification processes suffer from low efficiency and high energy consumption when treating such high-concentration wastewater. Therefore, it was decided to adopt the continuous flow zeolite fluidized bed nitrification reactor of this invention for treatment.

[0067] Equipment configuration:

[0068] Reactor body: rectangular, with dimensions of 3 m × 1.5 m × 4 m (length × width × height).

[0069] Enlarged opening: The length is twice the width of the reactor body, i.e., 3 m, and the length-to-width ratio of the enlarged opening is 2:1 to 3:1.

[0070] Conical sedimentation zone: cone angle is 75°.

[0071] Water inlet system: The water inlet pipe is connected to the wastewater discharge outlet of the chemical plant, and the water distributor adopts a porous distribution plate, which is evenly distributed at the bottom of the reactor.

[0072] Aeration system: The aeration pipe is connected to the air compressor. Microporous aerators are installed on the aeration pipe. The microporous aerators are made of microporous ceramic plates and are evenly distributed inside the reactor. The gas flow regulating valve is installed on the aeration pipe.

[0073] Zeolite particles: particle size 0.5-1 mm, filling height 3 m.

[0074] Water outlet system: located at the overflow weir of the enlarged opening.

[0075] Sludge removal system: Regularly removes flocculent biochemical sludge.

[0076] Operating parameters:

[0077] Inlet flow rate: 15 m³ / h.

[0078] Aeration rate: 8 m³ / h.

[0079] Running time: 60 consecutive days.

[0080] Operation process:

[0081] Inlet water: Wastewater is evenly distributed to the bottom of the reactor through the inlet water system.

[0082] Aeration: The aeration system provides oxygen to maintain the fluidized state of the zeolite particles and promotes the nitrification reaction of ammonia nitrogen.

[0083] Reaction: The biofilm on the surface of zeolite particles adsorbs ammonia nitrogen in wastewater and converts it into nitrite.

[0084] Effluent: The treated effluent is discharged through an enlarged overflow weir.

[0085] Sludge removal: Flocculent biochemical sludge is periodically removed through the sludge removal system.

[0086] Processing effect:

[0087] Zeolite retention effect: The design of the enlarged inlet and the advection sedimentation zone effectively retains zeolite particles. After 60 days of operation, the zeolite loss rate is only 0.3%, which is much lower than that of traditional processes (usually 5%-10%).

[0088] Nitrification efficiency: The activity of nitrifying bacteria in the reactor is high, the nitrification rate reaches more than 85%, the nitrite concentration in the effluent is 42-85 mg / L, and the ammonia nitrogen removal rate exceeds 85%.

[0089] Sludge treatment: Flocculent biochemical sludge is discharged regularly through a sludge discharge system, making sludge treatment convenient and preventing secondary pollution.

[0090] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A continuous flow zeolite fluidized bed nitrification reactor, characterized in that, It includes the reactor body, inlet system, aeration system, effluent system, and sludge removal system; The water inlet system includes an inlet pipe (1) and a first flow regulating valve (9). One end of the inlet pipe (1) is connected to the bottom of the outer side of the reactor body (8) and communicates with the reactor body (8). The first flow regulating valve (9) is installed on the inlet pipe (1). The aeration system includes an aeration device (3), a microporous aerator (10), an aeration pipe (11), and a gas flow regulating valve (12). The aeration device (3) is installed at the bottom of the reactor body (8) and communicates with the aeration pipe (11) inside the reactor body. A microporous aerator (10) is installed on the aeration pipe (11). The microporous aerator (10) is evenly distributed on the reactor body (8). In 8), the gas flow regulating valve (12) is installed on the aeration pipe (11); the top of the reactor body (8) is provided with an enlarged port (5), the bottom of the reactor body (8) is provided with a conical sedimentation zone (2), the top opening of the conical sedimentation zone (2) is directly connected to the bottom of the reactor body (8), the bottom of the conical sedimentation zone (2) is provided with a sludge discharge system, and the reactor body (8) is filled with zeolite particles (4); the water discharge system includes a water discharge pipe (6) and a second flow regulating valve (13), one end of the water discharge pipe (6) is connected to the overflow weir of the enlarged port (5), and the second flow regulating valve (13) is installed on the water discharge pipe (6).

2. The continuous flow zeolite fluidized bed nitrification reactor according to claim 1, characterized in that, The reactor body (8) is a cuboid or cube, and the aspect ratio of the reactor body (8) is 1:1 to 2:

1.

3. The continuous flow zeolite fluidized bed nitrification reactor according to claim 1, characterized in that, The water inlet system and the aeration system are respectively located on both sides of the long side of the reactor body (8).

4. The continuous flow zeolite fluidized bed nitrification reactor according to claim 1, characterized in that, The particle size of the zeolite particles is 0.5-2 mm.

5. The continuous flow zeolite fluidized bed nitrification reactor according to claim 1, characterized in that, The length of the enlarged opening (5) is 1.2-2 times the width of the reactor body, and the length-to-width ratio of the enlarged opening is 2:1 to 3:

1.

6. The continuous flow zeolite fluidized bed nitrification reactor according to claim 1, characterized in that, The cone angle of the cone-shaped sedimentation zone is 45°~75°.

7. The continuous flow zeolite fluidized bed nitrification reactor according to claim 1, characterized in that, The conical sedimentation zone (2) is fixedly connected to the reactor body (8).

8. The continuous flow zeolite fluidized bed nitrification reactor according to claim 1, characterized in that, An advection sedimentation zone (14) is provided at the upper part of the enlarged opening (5).

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