Inlet water oxygen elimination device for upward flow denitrification biofilter

Abstract

The utility model discloses a water inlet oxygen elimination device for an upward flow denitrification biological filter, and belongs to the technical field of biological filters. The device specifically comprises a floating ball (1), a connecting rod (2), an adjusting gate valve (3), a water inlet pipe (4) and a water outlet pipe (5), the water inlet valve is controlled through the floating ball at the upper part of the device, water enters the biological filter at a constant speed, and the height of the floating ball is automatically adjusted along with the flow. And sewage falling is avoided. The falling phenomenon of inlet water is reduced, and dissolved oxygen in the inlet water is reduced. According to the oxygen elimination device, after the upward flow denitrification biofilter is transformed, the consumption of chemicals can be reduced, and the purpose of saving energy is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of denitrification biological filter devices, and in particular relates to an inlet oxygen removal device for an upward flow denitrification biological filter. Background Art

[0002] The denitrifying biofilter belongs to the category of biofilm method. Modern denitrifying biofilter is a wastewater treatment process that is based on the biological contact oxidation process and introduces the concept of filtration in drinking water treatment. Its outstanding feature is that it combines biological oxidation and filtration together. There is no sedimentation tank at the rear of the filter, and the filter is operated periodically by backwashing and regeneration. The pretreated sewage enters the bottom of the filter through the inlet channel and flows upward through the anoxic zone of the packing layer. Denitrifying bacteria can generate NO under anoxic conditions. 2 -N or NO 3 -N is an electron acceptor, and organic matter is used as an electron donor to reduce nitrogen to achieve denitrification; the presence of oxygen will inhibit the reduction of nitrates, mainly because: on the one hand, it inhibits the formation of nitrate reductase, and on the other hand, oxygen can act as an electron acceptor, thereby competitively hindering the reduction of nitrates. The dissolved oxygen concentration should be controlled to <0.5mg / L

[0003] In order to reserve enough head loss for the upward flow denitrification biofilter, there is a height difference of 2-3 meters between the main inlet channel of the existing upward flow denitrification biofilter and the inlet channel of the single filter. When sewage enters the single-cell inlet channel from the main inlet channel, it will flow down in a waterfall-like manner. The sewage will contact with the air in the process of waterfall-like contact with the air. The oxygen content will increase. Generally, the dissolved oxygen in the water will increase by 3-4 mg / L. The dissolved oxygen carried in the inlet water will consume the carbon source in the water, resulting in a decrease in the efficiency of the system in removing total nitrogen.

[0004] The existing technology has the following defects: due to the influence of the elevation, the water inlet channel in the upward flow denitrification biofilter tank structure cannot be eliminated, and the situation of the water inlet channel falling and reoxygenation cannot be reduced during operation;

[0005] Due to the limitations of existing technical conditions and the influence of hydraulic elevation, the problem of reoxygenation caused by current drop is an unavoidable problem in the traditional forward denitrification biofilter industry. Utility Model Content

[0006] The purpose of the utility model is to solve the problems of the prior art by adding only an oxygen removal device. The oxygen removal device adds an automatic water inlet adjustment device, which changes the traditional water inlet method. The falling phenomenon of the inlet water is reduced, and the dissolved oxygen in the inlet water is reduced. The oxygen removal device can save the consumption of reagents after the upward flow denitrification biological filter is modified, thereby achieving the purpose of energy saving.

[0007] A water inlet oxygen removal device for traditional upward denitrification biofilters. The water inlet valve is controlled by a float on the top of the device, and the water enters the biofilter at a uniform speed. The height of the float is automatically adjusted according to the flow rate, preventing sewage from falling.

[0008] A water inlet oxygen removal device for an upward flow denitrification biofilter, comprising a floating ball (1), a connecting rod (2), an adjusting gate valve (3), a water inlet pipe (4), and a water outlet pipe (5);

[0009] The structure of the regulating gate valve (3) comprises a rectangular fixed joint plate (3-1) (a composite structure formed by overlapping two plates), slideways (3-2) are arranged on the left and right sides of the gap between the fixed joint plates, and a circular through hole (3-3) is arranged on the lower plate surface of the fixed joint plate; a movable plate (3-4) parallel to the plate surface of the fixed joint plate is arranged in the gap between the fixed joint plates, and the left and right sides of the movable plate (3-4) cooperate with the slideways (3-2) so that the movable plate (3-4) can freely move up and down in the gap between the fixed joint plates (3-1), and can open the circular through hole (3-3) upwards and close the circular through hole (3-3) downwards, and the movable plate (3-4) can be moved up and down in the middle as needed to adjust the opening / opening of the circular through hole (3-3); one side of the circular through hole (3-3) is connected to a fixed water inlet pipe (4), and the other side of the circular through hole (3-3) is connected to a fixed water outlet pipe (5);

[0010] The lower end of the floating ball (1) is fixedly connected to a movable plate (3-4) in a gap of the regulating gate valve (3) through a connecting rod (2).

[0011] How to use the water inlet oxygen removal device:

[0012] The entire water inlet oxygen removal device is placed in a single-cell water inlet channel (8) and a fixed plywood (3-1) is vertically fixed at the bottom of the single-cell water inlet channel (8), wherein the water inlet pipe (4) is located inside the single-cell water inlet channel (8) and is used to take in water from the single-cell water inlet channel (8), and the water outlet pipe (5) extends out of the lower part of the single-cell water inlet channel (8) and is connected to the water inlet pipe (9) of the denitrification biological filter; the main water inlet channel (6) and the single-cell water inlet channel (8) are separated by a water inlet weir (7);

[0013] At the beginning, the circular through hole (3-3) of the water inlet deoxygenation device is closed due to the gravity of the movable plate (3-4) and the connecting rod (2). At this time, sewage flows from the main water inlet channel (6) over the water inlet weir (7) into the single-cell water inlet channel (8). As sewage continues to enter without sewage flowing out, the liquid level of the single-cell water inlet channel (8) slowly rises until it reaches below the float (1). As the water level continues to rise, the buoyancy of the float (1) is used to drive the connecting rod (2) and the movable plate (3-4) to adjust the size of the circular through hole (3-3), thereby controlling the water output until the circular through hole (3-3) is fully opened; the water inlet (4) is submerged in water and isolated from the outside air, thereby achieving the effect of isolating air, and at the same time increasing the height of the liquid level in the single-cell water inlet channel (8), thereby eliminating the reoxygenation caused by the liquid level difference.

[0014] The above method can automatically balance and adjust the liquid level height of a single-cell water inlet channel (8). The specific liquid level height can be adjusted according to the length of the connecting rod (2), so that the liquid level difference (liquid level difference between the total water inlet channel (6) and the single-cell water inlet channel (8)) is reduced (even without drop) and basically fixed, thereby reducing the oxygen content or accurately controlling the oxygen content (connecting rods (2) of different lengths can be replaced).

[0015] The utility model adopts the floating ball automatic control technology and is installed in the single-grid water inlet channel (8) of the biological filter. During operation, there is no drop between the single-grid water inlet channel and the main water inlet channel, and the amount of sewage is controlled by the floating ball according to the height of the liquid level to adjust the opening of the gate valve.

[0016] Compared with the existing upward flow denitrification biofilter water inlet channel structure, the utility model has the beneficial effect of eliminating the height difference when the water enters and eliminating the reoxygenation situation caused by the sewage falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of an inlet oxygen removal device for an upward flow denitrification biofilter;

[0018] Figure 2 This is a schematic diagram of the installation application.

[0019] A floating ball (1), a connecting rod (2), a regulating gate valve (3), a water inlet pipe (4), a water outlet pipe (5), a main water inlet channel (6), a water inlet weir (7), a single-cell water inlet channel (8), and a water inlet pipe of a biological filter tank (9);

[0020] A rectangular fixed joint plate (3-1), a slideway (3-2), a circular through hole (3-3), and a movable plate (3-4). DETAILED DESCRIPTION

[0021] The utility model technology aims to provide an oxygen removal device with adjustable water level installed in a single-cell water inlet channel of an upward flow denitrification biofilter, so as to eliminate the reoxygenation generated when the water inlet falls during operation.

[0022] Example 1

[0023] The structure of water inlet oxygen removal device is shown in Figure 1 , see Application Installation Figure 2 After the sewage flows from the main inlet channel 6 over the inlet weir 7 and enters the single-cell inlet channel 8, the liquid level of the single-cell inlet channel 8 slowly rises to below the float 1. The buoyancy of the float 1 drives the connecting rod 2 to operate the adjusting gate valve 3 to adjust the size of the valve opening, thereby controlling the water intake. The water inlet 4 is submerged in water and isolated from the outside air, achieving the effect of isolating the air, thereby eliminating the reoxygenation caused by the liquid level difference. The sewage flows from the water inlet 4 through the adjusting gate valve 3 to the water outlet 5 and enters the water inlet pipe 9 of the biological filter.

[0024] When the operation starts, the regulating gate valve 3 is in a closed state. As the water level of the single-cell water inlet channel 8 gradually rises to the liquid level h1, the float 1 begins to rise due to the buoyancy, and at the same time drives the regulating gate valve 3 to open.

[0025] After running for 1 minute, the liquid level stabilizes at h2 (which can be adjusted according to the length of the connecting rod, the weight of the connecting rod, the weight of the movable plate, and the buoyancy of the float). The liquid level fluctuates slightly with the ups and downs of the float 1 and reaches a stable state. When the amount of water changes, the opening of the gate valve 3 is automatically adjusted by the position of the float. Achieve stable operation of the liquid level. There is no drop between the total water inlet channel 6 and the single-cell water inlet channel 8.

[0026] When the amount of sewage decreases, the water level in the water inlet area drops, the float 1 drops with the water level, and the regulating gate valve 3 automatically closes the valve with the float to ensure that the water level of the single-cell water inlet channel 8 is constant at h2.

[0027] The present application is particularly useful for regulating oxygen content in an already constructed upward flow denitrification biofilter which is difficult to modify.

Claims

1. An inlet oxygen removal device for an upward flow denitrification biological filter, characterized in that: It comprises a floating ball (1), a connecting rod (2), a regulating gate valve (3), a water inlet pipe (4), and a water outlet pipe (5); The structure of the regulating gate valve (3) comprises a rectangular fixed joint plate (3-1), wherein the rectangular fixed joint plate (3-1) is a composite structure formed by stacking two plates, wherein slideways (3-2) are arranged on the left and right sides of the gap between the fixed joint plates, and a circular through hole (3-3) is arranged on the lower plate surface of the fixed joint plate; wherein a movable plate (3-4) parallel to the plate surface of the fixed joint plate is arranged in the gap between the fixed joint plates, and the left and right sides of the movable plate (3-4) cooperate with the slideways (3-2) so that the movable plate (3-4) can freely move up and down in the gap between the fixed joint plates (3-1), and can open the circular through hole (3-3) upwards and close the circular through hole (3-3) downwards, and the movable plate (3-4) can be moved up and down in the middle as needed to adjust the opening / opening of the circular through hole (3-3); one side of the circular through hole (3-3) is connected to a fixed water inlet pipe (4), and the other side of the circular through hole (3-3) is connected to a fixed water outlet pipe (5); The lower end of the floating ball (1) is fixedly connected to a movable plate (3-4) in a gap of the regulating gate valve (3) through a connecting rod (2).

2. The water inlet oxygen removal device according to claim 1, characterized in that: The entire water inlet oxygen removal device is placed in a single-cell water inlet channel (8) and a fixed plywood (3-1) is uprightly fixed at the bottom of the single-cell water inlet channel (8), wherein the water inlet pipe (4) is located inside the single-cell water inlet channel (8) and is used to take in water from the single-cell water inlet channel (8); the water outlet pipe (5) extends out of the lower part of the single-cell water inlet channel (8) and is connected to the water inlet pipe (9) of the denitrification biological filter tank; the main water inlet channel (6) and the single-cell water inlet channel (8) are separated by a water inlet weir (7).

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