Denitrification nitrogen removal device capable of switching treatment reaction types

Abstract

The utility model discloses a denitrification nitrogen removal device capable of switching treatment reaction types, which comprises a column body biofilter, a closing plate, a water inlet pump and a movable filter plate, the column body biofilter is provided with an upper end side with one open end and a lower end side with one closed end, a supporting layer is arranged in the lower end side, a fixed filter plate is arranged above the supporting layer, and the movable filter plate is arranged above the fixed filter plate. A filler layer is arranged above the fixed filter plate, a water inlet is formed in the side wall of the lower end side, a material changing opening is formed in the upper part, close to the fixed filter plate, of the side wall, and a water outlet is formed in the side wall of the upper end side; the closing plate is detachably mounted on the material changing opening; the water inlet pump is communicated with the water inlet; the movable filter plate is provided with a mounting end and a filter end, the mounting end is detachably connected with the upper end side, the filter end is positioned in the cylindrical biological filter, and the water outlet is positioned on the upper side of the filter end. Therefore, mutual switching between a sulfur autotrophic denitrification process and a heterotrophic denitrification process can be realized, so that a more appropriate process can be selected for treatment according to different sewage.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment devices, in particular to a denitrification and denitrification device capable of switching treatment reaction types. Background Art

[0002] As my country continues to strengthen its efforts to control nitrogen pollution in its water environment, the requirements for total nitrogen in pollution emission standards are becoming increasingly stringent. Traditional wastewater treatment denitrification is typically achieved through nitrification and denitrification. Heterotrophic denitrification processes have good denitrification effects, but they require the addition of an external carbon source. The tightening of national water quality standards means an increase in the amount of carbon source added, which can easily increase the potential for secondary pollution. Therefore, a sulfur-based autotrophic denitrification technology has emerged, which does not require an external organic carbon source and has low operating costs.

[0003] Sulfur autotrophic denitrification technology is a process that uses reduced sulfur compounds (SO, S 2- 、S2O 3- ) as an electron donor to NO2 - -N or NO2 - The process of reducing -N to N2 is widely used because it does not require the addition of organic carbon sources, has low sludge production, and has no secondary pollution.

[0004] However, although sulfur autotrophic denitrification technology avoids the problem of adding external carbon sources, the denitrification rate is generally only 1 / 4 to 1 / 3 of the heterotrophic denitrification rate, and is more suitable for the treatment of dispersed sewage and low carbon-nitrogen ratio sewage.

[0005] Therefore, in water bodies with high carbon-nitrogen ratios, such as certain specific industrial wastewater treatment processes, heterotrophic denitrification technology still needs to be used for treatment. General denitrification and denitrification equipment cannot naturally and quickly switch between sulfur autotrophic denitrification processes and heterotrophic denitrification processes, making it impossible for denitrification and denitrification equipment to select a more appropriate process for treatment of different wastewaters. Therefore, improvement is urgently needed. Utility Model Content

[0006] The main purpose of the utility model is to propose a denitrification and denitrification device with switchable treatment reaction types, so as to solve the problem in the related art that the denitrification and denitrification device cannot switch between the sulfur autotrophic denitrification process and the heterotrophic denitrification process.

[0007] To achieve the above-mentioned objectives, the utility model proposes a denitrification and denitrification device with switchable treatment reaction types, comprising: a column biological filter tank, having an upper end side with an open end and a lower end side with a closed end, a supporting layer being arranged inside the lower end side, a fixed filter plate being arranged above the supporting layer, a filler layer being arranged above the fixed filter plate, a water inlet being arranged on the side wall of the lower end side, the water inlet being connected to the supporting layer, a material changing port being arranged on the side wall of the column biological filter tank adjacent to the above of the fixed filter plate, and a water outlet being arranged on the side wall of the upper end side; a closing plate, the closing plate being detachably mounted on the material changing port, the closing plate being used to seal the material changing port; a water inlet pump, the water inlet pump being connected to the water inlet; a movable filter plate, having a mounting end and a filtering end, the mounting end being detachably connected to the upper end side, the filtering end being located in the column biological filter tank, and the water outlet being located on the upper side of the filtering end.

[0008] In some embodiments, a plurality of water intakes are provided on the side wall of the column biological filter, each of the water intakes is spaced apart along the length direction of the column biological filter, and each of the water intakes is located between the fixed filter plate and the movable filter plate.

[0009] In some embodiments, each of the water intakes is connected by a hose, and the diameter of each of the water intakes is less than or equal to 3 mm.

[0010] In some embodiments, an overflow port is provided on the side wall of the column biological filter, the overflow port is located above the movable filter plate, and the overflow port is connected to an overflow pipe.

[0011] In some embodiments, a liquid flow meter is provided between the water inlet pump and the water inlet.

[0012] In some embodiments, an air inlet is further provided on the side wall of the lower end side, and the denitrification and denitrification device with switchable treatment reaction type also includes a backwash water pump and an air pump. The air pump is connected to the air inlet, the water inlet end of the backwash water pump is connected to the water outlet through a water pipe, and the water outlet end of the backwash water pump is connected to the opening on the upper end side.

[0013] In some embodiments, a gas flow meter is connected between the air pump and the air inlet.

[0014] In some embodiments, a pressure sensor is provided on the fixed filter plate.

[0015] In some embodiments, the upper end side of the columnar biological filter has a first section and a second section that are interconnected, the first section is located above the second section, the inner diameter of the first section is larger than the inner diameter of the second section, the mounting end of the movable filter plate is detachably mounted on the steps between the first section and the second section, and the filtering end is located inside the second section.

[0016] In some embodiments, the material exchange port is provided with a sealing ring extending along its diameter, and the closing plate is installed on the end of the material exchange port by screw locking, and the closing plate is connected to the end of the material exchange port to squeeze the sealing ring.

[0017] The beneficial effects of the technical solution of this utility model are:

[0018] The denitrification and denitrification device with switchable treatment reaction types of the present invention is provided with a detachable movable filter plate on the upper end side of the column biological filter and a material changing port on the lower end side. When the sulfur autotrophic nitrification reaction process is used, the sulfur-iron composite filler can be filled in the filler layer. Since the sulfur-iron composite filler is a heavy material, it can sink to the bottom of the pool and fully contact with the sewage. When it is necessary to switch to the heterotrophic denitrification reaction, the sealing plate on the material changing port can be opened, the sulfur-iron composite filler in the filler layer can be taken out, and the filler layer can be replaced with a light filter material such as polypropylene balls, and then the sealing plate can be closed. The closing plate is installed on the material exchange port, and the movable filter plate is then installed. The lightweight polypropylene balls are in a floating state in the column biological filter, and under the squeezing of the filtering end of the movable filter plate, the polypropylene balls can be immersed in a state, ensuring that the polypropylene balls are in full contact with the sewage. In this way, by arranging the movable filter plate on the upper end side of the column biological filter and replacing the filter material at the material exchange port, the denitrification and denitrification device can realize switching between the sulfur autotrophic denitrification process and the heterotrophic denitrification process, so that the denitrification and denitrification device can select a more appropriate process for treatment according to different sewage, with high flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a denitrification and denitrification device with switchable treatment reaction types according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Installation cross-section of the middle closing plate closing the refueling port;

[0021] Figure 3 for Figure 1 A magnified schematic diagram of part A in the figure.

[0022] Description of Figure Numbers:

[0023] 100. Column biofilter; 110. Supporting layer; 120. Fixed filter plate; 121. Pressure sensor; 130. Packing layer; 140. First section; 150. Second section; 101. Water inlet; 102. Material change port; 103. Water outlet; 104. Water intake; 105. Overflow port; 106. Air inlet; 200. Closing plate; 210. Sealing ring; 300. Water inlet pump; 310. Liquid flow meter; 400. Movable filter plate; 410. Mounting end; 420. Filter end; 500. Backwash pump; 600. Air pump; 610. Gas flow meter; 700. Clean water collection tank. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the schemes in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0025] In view of the technical defects in the related art, the present invention provides a denitrification and denitrification device with switchable treatment reaction types. Figures 1 to 2 The denitrification and denitrification device with switchable treatment reaction types includes: a columnar biological filter 100, a closing plate 200, a water inlet pump 300 and a movable filter plate 400, wherein the columnar biological filter 100 has an upper end side with an open end and a lower end side with a closed end. The columnar biological filter 100 can be made of bricks and cement, or can be made of steel sheet metal welding, or can be constructed of other durable materials, which is not specifically limited here.

[0026] A supporting layer 110 is provided inside the lower end side of the column biological filter 100, a fixed filter plate 120 is provided above the supporting layer 110, and a packing layer 130 is provided above the fixed filter plate 120; filter materials (such as pebbles, sand and gravel, etc.) are provided in the supporting layer 110, and the supporting layer 110 provides necessary physical support for the upper packing layer 130, and helps the sewage to enter the packing layer 130 in the column biological filter 100 evenly, and ensures that the filter medium in the entire packing layer 130 can effectively participate in the filtration process. In addition, this uniform flow helps to improve the filtration efficiency and extend the service life of the filter medium.

[0027] The fixed filter plate 120 is used to isolate the support layer 110 from the packing layer 130. Furthermore, a water inlet 101 is provided on the side wall of the lower end of the column biological filter 100. The water inlet 101 is connected to the support layer 110, and the water inlet pump 300 is connected to the water inlet 101. That is, sewage can enter the support layer 110 through the water inlet 101 under the drive of the water inlet pump 300.

[0028] A material change port 102 is provided on the side wall of the column biological filter 100 adjacent to the upper side of the fixed filter plate 120, and a closing plate 200 is detachably mounted on the material change port 102, and the closing plate 200 is used to seal the material change port 102; when the filter material needs to be replaced, the closing plate 200 can be opened, the filter material in the supporting layer 110 can be manually replaced, and then the closing plate 200 can be mounted on the material change port 102 to seal the material change port 102.

[0029] Furthermore, the movable filter plate 400 has a mounting end 410 and a filtering end 420. The mounting end 410 is detachably connected to the upper end. The filtering end 420 is located within the cylindrical biological filter 100. A water outlet 103 is provided on the sidewall of the upper end, and the water outlet 103 is located above the filtering end 420. The water outlet 103 is also connected to the clean water collection tank 700, which is used to collect the treated and filtered sewage.

[0030] When using the sulfur autotrophic nitrification reaction process, the sulfur-iron composite filler can be filled in the filler layer 130. Since the sulfur-iron composite filler is a heavy material, it can sink to the bottom of the pool and fully contact with the sewage. When it is necessary to switch to heterotrophic denitrification reaction, the closing plate 200 on the material exchange port 102 can be opened, the sulfur-iron composite filler in the filler layer 130 can be taken out, and the filler layer 130 can be replaced with a lightweight filter material such as polypropylene balls. Then, the closing plate 200 is installed on the material exchange port 102, and the movable filter plate 400 is installed at this time. The lightweight polypropylene balls The polypropylene balls are in a floating state in the column biological filter 100, and are squeezed by the filtering end 420 of the movable filter plate 400 to be immersed in an immersed state, ensuring that the polypropylene balls are in full contact with the sewage. In this way, by arranging the movable filter plate 400 on the upper end side of the column biological filter 100 and replacing the filter material at the material changing port 102, the denitrification and denitrification device can switch between the sulfur autotrophic denitrification process and the heterotrophic denitrification process, so that the denitrification and denitrification device can select a more appropriate process for treating different sewage, with high flexibility.

[0031] It should be noted that the detachable connection between the mounting end 410 and the upper end of the movable filter plate 400 may be a snap connection, a plug connection, a screw lock, or other detachable connection methods, which are not specifically limited herein.

[0032] To facilitate staff testing of wastewater at different heights within the columnar biofilter 100, in this embodiment, multiple water intakes 104 are provided on the sidewalls of the columnar biofilter 100. These intakes 104 are spaced apart along the length of the columnar biofilter 100 and located between the fixed filter plate 120 and the movable filter plate 400. Each intake 104 is connected by a hose; a water-stop clamp can also be installed on the hose to control the switch, making it easier for staff to extract wastewater. Furthermore, the diameter of each intake 104 is 3 mm or less, preventing the filter material in the packing layer 130 from escaping through the intake 104 during water extraction.

[0033] To prevent sewage overflow from the column biofilter 100, and to prevent the possibility of clogging at outlet 103, an overflow port 105 is provided on the sidewall of column biofilter 100 in this embodiment. Overflow port 105 is located above the movable filter plate 400 and is connected to an overflow pipe. This allows sewage to flow out of the overflow pipe at overflow port 105 and back into the unfiltered sewage tank if outlet 103 becomes clogged.

[0034] In some embodiments, a liquid flow meter 310 is provided between the water inlet pump 300 and the water inlet 101. Through the liquid flow meter 310, the staff can clearly observe the amount of sewage flowing into the column biofilter 100 for filtration, which facilitates the control of sewage inflow and the calculation of the degree of filter material loss.

[0035] Taking into account that biomass sludge will be generated during the sewage treatment process, it is necessary to flush the pool to prevent sludge blockage. In this embodiment, an air inlet 106 is also provided on the side wall of the lower end side, and the denitrification denitrification device with switchable treatment reaction type also includes a backwash water pump 500 and an air pump 600. The air pump 600 is connected to the air inlet 106, and the water inlet end of the backwash water pump 500 is connected to the water outlet 103 through a water pipe, and the water outlet end of the backwash water pump 500 is connected to the opening on the upper end side. Thus, when the air pump 600 is working, it can pump gas from the air inlet 106 into the bottom of the column biological filter 100, flushing the sludge in the sludge column biological filter 100. In addition, the backwash water pump 500 introduces the filtered sewage from the opening at the upper end of the outlet 103 to flush the sludge located on the upper side of the column biological filter 100. A liquid flow meter 310 is also provided between the backwash water pump 500 and the opening at the upper end of the column biological filter 100 to measure the flow rate of water pumped into the column biological filter 100 by the backwash water pump. In addition, a gas flow meter 610 is connected between the air pump 600 and the air inlet 106 to facilitate the staff to measure the amount of gas injected.

[0036] In some embodiments, a pressure sensor 121 is provided on the fixed filter plate 120. The pressure sensor 121 is used to measure the water pressure difference between the upper and lower sides of the fixed filter plate 120. Furthermore, the denitrification denitrification device with switchable treatment reaction types also includes a controller, which is electrically connected to the water inlet pump 300, the backwash water pump 500, the liquid flow meter 310, the pressure sensor 121, and the air pump 600. When there is a lot of sludge below the fixed filter plate 120, the pressure sensor 121 will monitor the pressure difference between the lower and upper parts of the fixed filter plate 120 in real time and feed it back to the controller. When the pressure difference exceeds a predetermined value, the controller controls the water inlet pump 300 to reduce or stop the flow of sewage into the column biological filter 100, and simultaneously starts the backwash water pump 500 and the air pump 600 to flush the sludge in the column biological filter 100 until the pressure sensor 121 detects that the pressure difference between the upper and lower sides of the fixed filter plate 120 does not exceed the predetermined value.

[0037] It should be noted that the controller can be a single chip microcomputer, a PWM controller, a PLC controller, a microprocessor or other electrical components that can receive external signals and output execution command signals, and no specific limitation is made here.

[0038] In order to facilitate the staff to install and disassemble the movable filter plate 400, in this embodiment, the upper end side of the column biological filter 100 has a first section 140 and a second section 150 that are connected to each other. The first section 140 is located above the second section 150, and the inner diameter of the first section 140 is larger than the inner diameter of the second section 150. The mounting end 410 of the movable filter plate 400 is detachably mounted on the step between the first section 140 and the second section 150, and the filtering end 420 is located inside the second section 150. In this way, when the movable filter plate 400 needs to be installed, the filtering end 420 of the movable filter plate 400 is extended from the opening on the upper end side into the interior of the second section 150, and then the mounting end 410 is placed on the step between the first section 140 and the second section 150. At this time, the mounting end 410 can be fixed to the step between the first section 140 and the second section 150 by screw locking, or by snap-fitting. The mounting end 410 can also be fixed to the step between the first section 140 and the second section 150 in other detachable ways, which are not specifically limited here.

[0039] See also Figure 1 and Figure 3A first section 140 and a second section 150 that are interconnected are formed inside the upper end side of the column biological filter 100. Since the first section 140 is located above the second section 150 and the inner diameter of the first section 140 is larger than the inner diameter of the second section 150, a step is formed at the connection between the first section 140 and the second section 150. Through the step, the mounting end 410 of the movable filter plate 400 can be placed on the step, thereby facilitating the installation, replacement and maintenance of the movable filter plate 400.

[0040] In this embodiment, a sealing ring 210 is provided on the refueling port 102, extending along its diameter. A sealing plate 200 is screwed onto the end of the refueling port 102. The sealing plate 200 is connected to the end of the refueling port 102 to squeeze the sealing ring 210. This prevents sewage in the cylindrical biofilter 100 from leaking out through the refueling port 102.

[0041] The above description is only part or preferred embodiments of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A denitrification and denitrification device with switchable treatment reaction types, characterized in that: The denitrification and denitrification device with switchable treatment reaction types includes: A columnar biological filter (100) has an upper end side with an open end and a lower end side with a closed end, a supporting layer (110) is provided inside the lower end side, a fixed filter plate (120) is provided above the supporting layer (110), a filler layer (130) is provided above the fixed filter plate (120), a water inlet (101) is provided on the side wall of the lower end side, the water inlet (101) is communicated with the supporting layer (110), a material replacement port (102) is provided on the side wall of the columnar biological filter (100) adjacent to the fixed filter plate (120), and a water outlet (103) is provided on the side wall of the upper end side; a closing plate (200), the closing plate (200) being detachably mounted on the refueling port (102), the closing plate (200) being used to seal the refueling port (102); a water inlet pump (300), the water inlet pump (300) being connected to the water inlet (101); The movable filter plate (400) has a mounting end (410) and a filtering end (420), wherein the mounting end (410) is detachably connected to the upper end side, the filtering end (420) is located in the column biological filter (100), and the water outlet (103) is located on the upper side of the filtering end (420).

2. The denitrification and denitrification device with switchable treatment reaction types according to claim 1, characterized in that: A plurality of water intakes (104) are provided on the side wall of the column biological filter (100), each of the water intakes (104) being arranged at intervals along the length direction of the column biological filter (100), and each of the water intakes (104) being located between the fixed filter plate (120) and the movable filter plate (400).

3. The denitrification and denitrification device with switchable treatment reaction types according to claim 2, characterized in that: Each of the water intakes (104) is connected by a hose, and the diameter of each of the water intakes (104) is less than or equal to 3 mm.

4. The denitrification and denitrification device with switchable treatment reaction types according to claim 1, characterized in that: An overflow port (105) is provided on the side wall of the column biofilter (100), the overflow port (105) is located above the movable filter plate (400), and the overflow port (105) is connected to an overflow pipe.

5. The denitrification and denitrification device with switchable treatment reaction types according to claim 1, characterized in that: A liquid flow meter (310) is provided between the water inlet pump (300) and the water inlet (101).

6. The denitrification and denitrification device with switchable treatment reaction types according to claim 1, characterized in that: An air inlet (106) is also provided on the side wall of the lower end side. The denitrification and denitrification device with switchable treatment reaction type further comprises a backwash water pump (500) and an air pump (600). The air pump (600) is connected to the air inlet (106). The water inlet end of the backwash water pump (500) is connected to the water outlet (103) through a water pipe, and the water outlet end of the backwash water pump (500) is connected to the opening on the upper end side.

7. The denitrification and denitrification device with switchable treatment reaction types according to claim 6, characterized in that: A gas flow meter (610) is connected between the air pump (600) and the air inlet (106).

8. The denitrification and denitrification device with switchable treatment reaction types according to claim 1, characterized in that: A pressure sensor (121) is provided on the fixed filter plate (120).

9. The denitrification and denitrification device with switchable treatment reaction types according to claim 1, characterized in that: The upper end side of the column biological filter (100) has a first section (140) and a second section (150) that are connected to each other. The first section (140) is located above the second section (150). The inner diameter of the first section (140) is larger than the inner diameter of the second section (150). The mounting end (410) of the movable filter plate (400) is detachably mounted on the step between the first section (140) and the second section (150). The filtering end (420) is located inside the second section (150).

10. The denitrification and denitrification device with switchable treatment reaction types according to claim 1, characterized in that: The refueling port (102) is provided with a sealing ring (210) extending along its diameter, and the closing plate (200) is installed on the end of the refueling port (102) by screw locking. The closing plate (200) is connected to the end of the refueling port (102) to squeeze the sealing ring (210).

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