Filler activation device for autotrophic nitrogen removal filter

Abstract

The utility model discloses a filler activation device for an autotrophic nitrogen removal filter, which is characterized in that the filter is divided into a plurality of areas based on a tank wall and a weir, an activation driving device is arranged in each area, and the activation driving device is connected with a wing blade through a screw rod piece. The wing blades are controlled to rotate and cruise in the corresponding areas in a reciprocating manner, so that the wing blades and the fillers or the fillers are mutually extruded and rubbed, an over-thick biological membrane on the surfaces of the fillers is stripped, nitrogen bubbles clamped by a filler layer are discharged, and the effective porosity of the filler layer is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of deep denitrification of sewage or wastewater, and particularly relates to a method for enhancing nitrogen removal efficiency of a sulfur autotrophic denitrification filter and a filler bed activation device in an actual sewage treatment plant. Background Technique

[0002] With the continuous advancement of urbanization and industrialization, the global nitrogen flux has exceeded the carrying capacity of the earth, posing a serious threat to water quality and public health. Reducing nitrogen emissions into the water environment has become an urgent need to alleviate water eutrophication and maintain ecological security. In this context, strengthening the research and development of deep denitrification technology and promoting its popularization and application in the field of sewage treatment have become an urgent task for current sewage treatment plants to meet the demand for deep water purification and fulfill their ecological environmental protection responsibilities.

[0003] In actual sewage treatment plants, the mainstream denitrification filters mostly use carriers such as quartz sand and ceramsite as the film-forming medium for denitrifying organisms, and rely on external addition of carbon sources for heterotrophic denitrification reactions to achieve nitrogen removal. This traditional heterotrophic denitrification technology has high operating costs. Especially for large sewage treatment plants, the cost of carbon source input is quite considerable. At the same time, by-products may be generated during the heterotrophic denitrification process. For example, adding organic carbon sources may exacerbate the emission of greenhouse gas CO2, having an adverse impact on the environment and climate change. In addition, the traditional heterotrophic denitrification technology also has the problem of relatively high sludge production, increasing the cost and complexity of sludge disposal, as well as the demand for disposal sites. And operators need to strictly control the reaction conditions and the addition of organic carbon sources, otherwise the treatment effect may decline.

[0004] In recent years, sulfur autotrophic denitrification technology has gradually become a hot research direction in the field of deep sewage denitrification technology due to its advantages such as not relying on carbon source addition, small sludge production, and low operating cost. Its application fields involve the deep purification of drinking water, groundwater, and secondary effluent. In terms of process form, the sulfur autotrophic denitrification fixed bed process is widely used in actual sewage treatment biological filter projects due to its simple structure and low cost. However, in this fixed bed process form, the sulfur-based filter media filling layer is essentially in a static state all the time. There are problems such as continuous accumulation of nitrogen and continuous thickening of the biofilm, which continuously occupy the effective reaction space of the bed layer during long-term operation, resulting in a relatively low denitrification rate or even continuous deterioration of performance.

[0005] In actual sewage treatment projects, the main strategy to address the problems of low denitrification efficiency and unstable long-term operation faced by the above-mentioned sulfur autotrophic denitrification filter is backwashing. However, backwashing has the following technical defects: 1) High energy consumption: Whether it is air washing, water washing, or air-water combined washing, it relies on a large amount of energy consumption, resulting in an increase in operating costs. 2) Water quality fluctuation: The backwashing process may cause water quality fluctuations, affecting the stability of the treatment system and the consistency of water quality. 3) High maintenance cost: The backwashing filter needs to be regularly maintained and cleaned, increasing the operating cost and labor demand. 4) Limited performance: The design and operation of the backwashing filter may limit its treatment capacity and efficiency. Research shows that nitrogen can be fully released under the condition that the backwashing (water washing) intensity ≥ 30m / h. However, currently, the backwashing intensity of most filters is relatively low, nitrogen is not fully excluded, and the backwash water flow is often unevenly distributed, making it difficult to effectively control the biofilm thickness of the filter media throughout the pool. 5) Resource waste: A large amount of water used in the backwashing process may waste water resources and increase the discharge of treated wastewater.

[0006] Currently, some related technologies and defects in solving the low efficiency and instability of filters mainly include:

[0007] (1) Utility model patent 202221365044.0 discloses a denitrification filter. The filter structure includes a box body with a water distribution area, a filtration area, and an outlet area distributed from top to bottom in sequence, and a driving motor is arranged above the box body. The output end of the driving motor is connected to a stirring shaft. By arranging a number of stirring rods on the stirring shaft and placing the stirring rods in the filter media layer, a relatively high filter media cleaning efficiency is achieved. This method only has a good cleaning effect on the upper layer of filter media. It is still necessary to cooperate with a backwashing pipeline in the water distribution area, and the maintenance and operation are complex. Moreover, the running track of the stirring rod is single and fixed, and there are still filter media dead zones that cannot be stirred.

[0008] (2) Utility model patent 202222517514.7 discloses an up-flow denitrification filter with an external water distribution and gas distribution chamber, including a filter body and a water distribution and gas distribution chamber arranged outside the filter body; a water distribution and gas distribution system is arranged at the bottom inside the filter body, and the lower part of the water distribution and gas distribution chamber is connected to the water distribution and gas distribution system at the bottom of the filter body. The water distribution and gas distribution chamber is provided with a water inlet pipe, a backwashing air inlet pipe, a backwashing water inlet pipe, and an exhaust pipe, and the upper part of the filter body is provided with a water outlet pipe and a backwashing drain pipe. By combining up-flow filtration, this method can effectively backwash the entire filtration surface. This method requires an additional water distribution and gas distribution chamber outside the filter body, increasing the construction area and cost investment of the filter, and the regular backwashing depends on the staff for backwashing maintenance, increasing the management cost.

[0009] (3) Patent CN202311815043.0 discloses a deep bed denitrification filter. By fixedly connecting a transfer pipe to the outer wall of the filter, fixedly connecting a water pump to the upper end of the transfer pipe, fixedly connecting a pipe body to the end far from the filter, fixedly connecting a limiting ring and a tension spring in the middle of the pipe body, fixedly connecting a dirt cleaning device to the upper end of the tension spring, and fixedly connecting a linkage device to the outer wall of the upper end of the pipe body, and fixedly connecting a water storage tank to the end of the linkage device far from the pipe body. By sensing the water flow rate through the linkage device to control the shutdown of the water pump, the tension spring can drive the dirt cleaning device to perform backwashing operation on the suspended substances inside the filter. This method requires the addition of a linkage device, and the structure is complex and requires regular maintenance, and the feasibility of engineering application is unknown.

[0010] (4) The literature (Mohammadi, A. S., Movahedian, H., & Nikaeen, M. (2011). Drinking water denitrification with autotrophic denitrifying bacteria in a fluidized bed bioreactor (FBBR). Fresenius environmental bulletin, 20(9A), 2427 - 2434.) describes a fluidized bed bioreactor with sulfur-activated carbon composite particles as the carrier. The experimental results show that as the HRT is shortened, although the nitrate removal load increases, there is a high accumulation of nitrite. The experimental conclusion is that the stable operation HRT of this reactor needs to be 2.4 h or more. This method promotes the fluidization of the sulfur-based carrier in the reactor by providing an extremely high circulating water flow rate, but the research does not involve the content related to the change of biofilm characteristics, and it cannot be confirmed whether it is an effective means to control the excessive thickening of the biofilm. Moreover, its energy consumption is high, the reaction conditions are limited, and there are difficulties in large-scale engineering applications. In addition, from the perspective of long-term operation, the size of sulfur particles will become uneven with the progress of the denitrification reaction, and smaller-sized sulfur particles may be lost from the reactor due to the high circulating water flow rate, resulting in waste of resources and additional cost burden.

[0011] For the above reasons, the present inventor has conducted in-depth research on the existing denitrification filter stirring system, hoping to design a new autotrophic denitrification filter packing activation device that can solve the above problems. Utility Model Content

[0012] To overcome the above problems, the present inventor has conducted intensive research and designed an autotrophic denitrification filter packing activation device. In this device, the filter is divided into multiple regions based on the pool wall and the weir, and an activation driving device is provided in each region. A fin is connected to the activation driving device through a spiral rod. By reciprocating in the corresponding region while controlling the rotation of the fin, the fin and the packing, or the packing and the packing are mutually extruded and rubbed, stripping the too thick biofilm on the surface of the packing, discharging the nitrogen bubbles clamped in the packing layer, and increasing the effective porosity of the packing layer, thus completing the present utility model.

[0013] Specifically, the object of the present utility model is to provide an autotrophic denitrification filter packing activation device.

[0014] The nitrification filter includes a transverse pool wall 1 and a longitudinal pool wall 2, and a longitudinally arranged weir 3 is provided in the nitrification filter.

[0015] At the bottom of the nitrification filter, a support layer 4 and a packing layer 5 are laid successively from bottom to top.

[0016] The packing bed activation system includes a spiral rod 6. The spiral rod 6 extends downward from above the nitrification filter into the packing layer 5. A fin 7 is installed on the spiral rod 6 located in the packing layer 5. The spiral rod 6 and the fin 7 can reciprocally move and rotate synchronously within a defined working area, so that the fin 7 and the packing, or the packing and the packing are mutually extruded and rubbed, thereby stripping the too thick biofilm on the surface of the packing, discharging the nitrogen bubbles clamped in the packing layer, and increasing the effective porosity of the packing layer.

[0017] The defined working area is the area between the longitudinal pool wall 2 and the weir 3 or the area between two adjacent weirs 3.

[0018] Among them, the packing bed activation system further includes a longitudinal running guide rail 8 installed at the top of the longitudinal pool wall 2. A structural support platform 9 is provided above the longitudinal running guide rail 8. The structural support platform 9 can reciprocally move along the longitudinal direction on the longitudinal running guide rail 8.

[0019] Among them, a longitudinal running unit 10 and a running directional support wheel 11 are provided on the structural support platform 9. The running directional support wheel 11 is driven by the longitudinal running unit 10 to roll on the longitudinal running guide rail 8, so that the structural support platform 9 reciprocally moves on the longitudinal running guide rail 8.

[0020] Among them, a transverse running guide rail 12 is provided on the structure support platform 9, and a plurality of activation driving devices 13 are provided on the transverse running guide rail 12. A transverse running unit 14 is provided on each activation driving device 13, and the activation driving device 13 is driven by the transverse running unit 14 to reciprocally slide on the transverse running guide rail 12.

[0021] Among them, the number of the activation driving devices 13 is the same as the number of the delimited working areas, that is, there is exactly one activation driving device 13 in each delimited working area;

[0022] In the transverse direction, each activation driving device 13 reciprocally slides along the transverse running guide rail 12 in the delimited working area.

[0023] Among them, the activation driving device 13 includes a driving motor, and the output shaft of the driving motor is connected to the spiral rod member 6, so as to drive the spiral rod member 6 to rotate in real time through the driving motor.

[0024] Among them, the packing bed activation system further includes an electrical control system 15,

[0025] The electrical control system 15 is signal-connected to the longitudinal running unit 10, the transverse running unit 14 and the activation driving device 13, so as to control the activation driving device 13 to move along a predetermined trajectory in the delimited working area while controlling the rotation of the spiral rod member 6, so that all the packing layers 5 in the nitrifying filter are agitated without blind spots.

[0026] The beneficial effects of the present utility model include:

[0027] (1) The autotrophic denitrification filter packing activation device provided by the present utility model is provided with an activation driving device, and a spiral rod member and fins are connected to the activation driving device. The fins and the packing, or the packing and the packing are mutually extruded and rubbed by the rotation of the spiral rod member and the fins, so as to peel off the too thick biofilm on the surface of the packing and discharge the nitrogen bubbles clamped in the packing layer, and improve the effective porosity of the packing layer;

[0028] (2) The autotrophic denitrification filter packing activation device provided by the present utility model can be flexible in the horizontal direction, so as to fully stir the packing layer and achieve the purpose of stirring without dead corners;

[0029] (3) After the autotrophic denitrification filter packing activation device provided by the present utility model is applied to the autotrophic denitrification filter filled with sulfur-based packing for sewage treatment, it can not only enhance the water quality stability, but also significantly improve the denitrification rate; by controlling the cruising period of the filter packing bed activation system, the denitrification rate can be greatly improved while saving the energy consumption cost.

[0030] (4) The autotrophic denitrification filter media activation device provided by the present utility model can achieve stable micro-fluidization movement of the filter media throughout the filter, so it can replace the backwashing operation commonly used in traditional filters, thereby effectively avoiding problems such as filter media damage, reduction in water production rate, and uneven backwashing that may occur during air washing and water washing.

[0031] (5) The autotrophic denitrification filter media activation device provided by the present utility model has a significantly reduced total nitrogen concentration in the effluent and is stable in the long term compared with the traditional fixed-bed sulfur autotrophic denitrification filter.

[0032] (6) For the autotrophic denitrification filter media activation device provided by the present utility model, the filter media bed activation system introducing a spiral drive device in the filter can significantly improve the nitrate nitrogen removal efficiency of the sulfur autotrophic denitrification filter; this innovative application with engineering significance can not only reduce the construction volume of the filter and the input of filter media, but also reduce the construction cost of the filter and the initial filter media purchase cost. Taking the improvement of denitrification efficiency by X as an example, the construction cost of the filter and the initial filter media purchase cost can be reduced to X / (1 + X) of the original. Therefore, in future applications, introducing the filter media bed activation system is expected to bring more significant social and economic benefits, especially for filters with a large volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Showing the front view of the autotrophic denitrification filter media activation device provided by the present utility model;

[0034] Figure 2 Showing the side view of the autotrophic denitrification filter media activation device provided by the present utility model;

[0035] Figure 3 Showing the top view of the autotrophic denitrification filter media activation device provided by the present utility model;

[0036] Figure 4 Showing the schematic diagram of the reciprocating cruising trajectory of the autotrophic denitrification filter media activation device in the embodiment of the present utility model.

[0037] REFERENCE NUMERALS

[0038] 1 - transverse pool wall

[0039] 2 - longitudinal pool wall

[0040] 3 - weir

[0041] 4 - supporting layer

[0042] 5 - filter media layer

[0043] 6 - spiral rod

[0044] 7 - fin

[0045] 8 - Longitudinal running guide rail

[0046] 9 - Structural support platform

[0047] 10 - Longitudinal running unit

[0048] 11 - Running directional support wheel

[0049] 12 - Transverse running guide rail

[0050] 13 - Activation drive device

[0051] 14 - Transverse running unit

[0052] 15 - Electrical control system

[0053] 16 - Stable support frame

[0054] 17 - Flange type universal joint

[0055] 18 - Water inlet pipe

[0056] 19 - Pedestrian passage Detailed implementation mode

[0057] The present invention will be further described in detail below with reference to the drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become more clearly defined.

[0058] The special term "exemplary" here means "serving as an example, embodiment or illustration". Any embodiment described as "exemplary" here does not have to be construed as superior to or better than other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0059] The present invention provides an autotrophic denitrification filter media activation device, as shown in Figure 1 , Figure 2 and Figure 3 . The denitrification filter includes a transverse pool wall 1 and a longitudinal pool wall 2, and a longitudinally arranged weir 3 is provided in the denitrification filter;

[0060] At the bottom of the denitrification filter, a supporting layer 4 and a filter media layer 5 are laid successively from bottom to top; filter media is laid in the filter media layer 5, so the filter media is also called packing, and this filter media layer is also called the filter media layer.

[0061] The said packing bed activation system includes a spiral rod 6 which extends downward from above the nitrifying filter into the packing layer 5. Fins 7 are installed on the spiral rod 6 located in the packing layer 5. The spiral rod 6 and the fins 7 can reciprocate and rotate synchronously within a defined working area, causing the fins 7 to squeeze and rub against the packing or the packing against the packing, thereby stripping the overly thick biofilm on the surface of the packing, accelerating the mass transfer efficiency of the substrate, discharging the nitrogen bubbles clamped by the packing layer, thus prolonging the actual residence time of the sewage and increasing the effective porosity of the packing layer; ultimately improving the denitrification efficiency of the reaction system.

[0062] The said defined working area is the area between the longitudinal pool wall 2 and the weir 3 or the area between two adjacent weirs 3.

[0063] In a preferred embodiment, the packing bed activation system further includes a longitudinal running guide rail 8 installed at the top of the longitudinal pool wall 2. Above the longitudinal running guide rail 8, there is a structural support platform 9 which can reciprocate along the longitudinal direction on the longitudinal running guide rail 8. The structural support platform 9 is an overall steel frame structure, including both a bottom plate support structure above the flat longitudinal running guide rail 8 and a herringbone structure support frame above it. The uppermost end is also equipped with an overall rain protection device.

[0064] The longitudinal running guide rail 8 is equipped with a cable dragging device, a longitudinal flat rail, a horizontal adjustment plate, fixing bolts, and running directional support wheels. It is driven by a single-phase shaft, and the single-phase shaft is equipped with a bearing support plate seat.

[0065] Preferably, a longitudinal running unit 10 and running directional support wheels 11 are provided on the structural support platform 9. The running directional support wheels 11 are driven by the longitudinal running unit 10 to roll on the longitudinal running guide rail 8, so that the structural support platform 9 reciprocates on the longitudinal running guide rail 8. Thus, the activation driving device 13 has mobility in the longitudinal direction.

[0066] Preferably, the longitudinal running unit 10 includes a cable drag chain platform, a running motor and a speed reducer. The running mode is that multiple running directional support wheels 11 rotate simultaneously, and the running power is transmitted by a gear and rack transmission shaft. Preferably, the running motor and the speed reducer rotate simultaneously to achieve two-stage variable frequency speed regulation and two-way output shaft. The variable frequency regulation speed range is 30 - 60 mm / min. Preferably, the speed reducer is equipped with a fixed machine base.

[0067] In a preferred embodiment, a transverse running guide rail 12 is provided on the structure support platform 9, and a plurality of activation driving devices 13 are provided on the transverse running guide rail 12. A transverse running unit 14 is provided on each activation driving device 13, and the activation driving device 13 is driven by the transverse running unit 14 to reciprocally slide on the transverse running guide rail 12.

[0068] Preferably, the transverse running unit 14 includes a cable drag chain platform, a running motor and a speed reducer, and the running type is gear-rack drive. The running motor and the speed reducer operate simultaneously to achieve double-stage frequency conversion speed regulation and two-way output shaft, and the frequency conversion regulation speed range is 20-60 mm / min. Preferably, the speed reducer is equipped with a fixed machine base.

[0069] Preferably, the transverse running guide rail 12 is equipped with a transverse flat rail, a compound horizontal rail and running directional support wheels, and is driven by a two-way shaft. The two-way shaft is equipped with a bearing support plate seat.

[0070] Preferably, the number of the activation driving devices 13 is the same as the number of the demarcated working areas, that is, there is one and only one activation driving device 13 in each demarcated working area;

[0071] In the transverse direction, each activation driving device 13 reciprocally slides along the transverse running guide rail 12 in the demarcated working area.

[0072] Preferably, the activation driving device 13 includes a driving motor, and the output shaft of the driving motor is connected to the spiral rod member 6, so as to drive the spiral rod member 6 to rotate in real time through the driving motor.

[0073] Preferably, the material of the spiral rod member 6 is stainless steel seamless pipe. The material of the fin 7 is stainless steel. Preferably, a stable support frame 16 is provided at the bottom of the structure support platform 9, and the driving motor and the spiral rod member 6 are supported and defined by the stable support frame 16; the spiral rod member 6 is connected to the driving motor through a flange type universal joint 17, and the material of the flange type universal joint 17 is stainless steel. The output speed of the driving motor is 10-20 r / min.

[0074] In a preferred embodiment, the packing bed activation system further includes an electrical control system 15,

[0075] The electrical control system 15 is signal-connected to the longitudinal running unit 10, the transverse running unit 14 and the activation driving device 13, so as to control the activation driving device 13 to move along a predetermined track in the demarcated working area while controlling the rotation of the spiral rod member 6, so that all the packing layers 5 in the nitrifying filter tank are agitated without blind spots, avoiding the hardening of the filter bed.

[0076] Preferably, the electrical control system 15 has both a human-machine interface and a variable-frequency speed regulation function. Through the PLC centralized control system, the activation drive device can be freely controlled to reciprocate along the horizontal and vertical automatic operation guide channels laid around the filter tank, truly realizing the "non-blind area" effective activation of all the filter media in the filter tank, ensuring an all-round improvement in the denitrification rate of the entire filter tank. Further, the electrical control system adopts a portable cabinet form that can be operated locally, and its control mode can be flexibly switched between manual and automatic modes as required, which is conducive to ensuring the close coordination between various operation processes and the stable operation of the equipment.

[0077] Embodiment

[0078] The autotrophic denitrification filter media activation device is installed on the No. 2 filter tank of the Shan nitrogen deep bed filter tank in Dongyang Sewage Treatment Plant. There are two water weirs in the No. 2 filter tank. The autotrophic denitrification filter media activation device adopts 3 groups of activation drive devices, and one set of activation drive device is installed in each of the left grid, middle grid, and right grid bounded by the filter tank water weir, as Figure 3 shown in the figure. The spiral rod is driven by the main motor system. The diameter of the fins on the spiral rod is 300 mm, and the effective influence range on the filter media can reach 500 mm. The total power of a single main motor system is 5.5 KW, which independently performs the function of rotating the spiral rod to lift the filter media; and the cruising operation of the main motor system is realized through the horizontal and vertical guide rail systems. The total power of a single horizontal guide rail unit is 550 W, and the total power of a single vertical guide rail unit is 750 W. The main machine system is driven in a gear rotation form, and the guide rail running speed is 50 - 70 mm / min.

[0079] Taking the middle grid as an example, the activation drive device starts cruising from one side of the left lower water weir at a certain speed. When it slides to one side of the right lower water inlet tank, the activation drive device changes the cruising direction and cruises forward a distance equal to the body length of one activation drive device along the direction of the water weir, and then continues to cruise from the edge of the right water weir to the edge of the left water weir. When the activation drive device cruises to the edge of the upper right water tank, it completes half of the cruising cycle, and continues to cruise back and forth until it returns to the starting point of the cycle, as Figure 4 shown in the figure.

[0080] During this process, the activation drive device drives the spiral rod and the fins to operate independently, realizing the activation and lifting of the filter media in the area it reaches, discharging nitrogen, removing dead bacteria, controlling the thickness of the biological film, eliminating the influence of caking and blockage in the area it reaches, and at the same time, sliding the filter media activation device to each area of the filter media layer through the horizontal and vertical guide rails to ensure uniform treatment range.

[0081] The equipment investment cost of the autotrophic denitrification filter filler activation device is calculated based on the equipment quotation of the Dongyang project and the single pool processing capacity of 7,500 tons / day. The equipment installation investment cost of the autotrophic denitrification filter filler activation device is 0.0052 yuan / ton of water, which is calculated based on the depreciation of the equipment during its 10-year service life. If an additional autotrophic denitrification filter filler activation device is installed, the equipment depreciation cost will increase by 0.00481 yuan / ton of water.

[0082] Based on the previous small-scale and pilot studies, it is known that after the autotrophic denitrification filter filler activation device is operated and then stopped, the reactor's efficient denitrification state can be maintained for about 4 days, so the autotrophic denitrification filter filler activation device was operated for 1 day and stopped for 3 days on the 2# pool. This is equivalent to consuming 163.2kw of electricity and treating 30,000 tons of water. Therefore, after adding the autotrophic denitrification filter filler activation device, the increased electricity consumption cost is 0.0054 yuan / ton of water.

[0083] At present, the backwash pump of pool 2 is 37kw, 2 units are working, and the backwash fan is 75kw, 2 units are working. According to the water washing twice a day, each time for 3 minutes, the total power consumption is 7.4kwh. According to the electricity fee of 1 yuan / kwh, 7,500 tons of water are processed every day, and the cost per ton of water is 0.001 yuan; steam-water washing is carried out once a week, each time the gas washing is 5 minutes, the steam-water washing is 5 minutes, and the water washing is 5 minutes, the total power consumption is 39.4kwh, according to the electricity fee of 1 yuan / kwh, 52,500 tons of water are processed every week, and the cost per ton of water is 0.0008 yuan; therefore, the total cost per ton of water treatment caused by the backwash power consumption is 0.0018 yuan.

[0084] After adding the autotrophic denitrification filter filler activation device, the nitrogen removal water washing is not required every day. A steam-water combined washing is carried out every 4 days after the filler activation system has toured, in order to flush away excess biological agglomerations and impurities. Each gas washing lasts 5 minutes, the steam-water combined washing lasts 5 minutes, and the water washing lasts 5 minutes. The total electricity consumption is 39.4 kWh. Based on an electricity charge of 1 yuan / kWh, and 30,000 tons of water are processed every 4 days, the cost per ton of water is 0.0013 yuan.

[0085]

[0086] After calculation, after the autotrophic denitrification filter filler activation device was installed in the 2# pool, the nitrate nitrogen removal amount can be increased by at least 2.5mg / L, and the total operating cost increased by 0.01491 yuan / ton of water. It can be seen that the autotrophic denitrification filter filler activation device can increase the nitrate nitrogen removal amount, the increased operating cost is low, and it has extremely high practical value.

[0087] The present invention has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, the present invention may be subjected to a variety of substitutions and improvements, all of which fall within the scope of protection of the present invention.

Claims

1. An autotrophic denitrification filter media activation device, characterized in that the autotrophic denitrification filter includes a transverse pool wall (1) and a longitudinal pool wall (2), and a longitudinally arranged water weir (3) is provided in the autotrophic denitrification filter; at the bottom of the autotrophic denitrification filter, a support layer (4) and a filter media layer (5) are sequentially laid from bottom to top; the filter media activation device includes a spiral rod member (6), the spiral rod member (6) extends downward from above the autotrophic denitrification filter into the filter media layer (5), and fins (7) are installed on the spiral rod member (6) located in the filter media layer (5), and the spiral rod member (6) and the fins (7) can reciprocally move and rotate synchronously within a defined working area, so that the fins (7) and the filter media, or the filter media and the filter media rub against each other, thereby peeling off the overly thick biofilm on the surface of the filter media, discharging the nitrogen gas bubbles clamped in the filter media layer, and improving the effective porosity of the filter media layer; the defined working area is the area between the longitudinal pool wall (2) and the water weir (3) or the area between two adjacent water weirs (3).

2. The autotrophic denitrification filter media activation device according to claim 1, characterized in that the filter media activation device further includes a longitudinal running guide rail (8) installed at the top of the longitudinal pool wall (2), and a structural support platform (9) is provided above the longitudinal running guide rail (8), and the structural support platform (9) can reciprocally move along the longitudinal direction on the longitudinal running guide rail (8).

3. The autotrophic denitrification filter media activation device according to claim 2, characterized in that a longitudinal running unit (10) and running directional support wheels (11) are provided on the structural support platform (9), and the running directional support wheels (11) are driven by the longitudinal running unit (10) to roll on the longitudinal running guide rail (8), so that the structural support platform (9) reciprocally moves on the longitudinal running guide rail (8).

4. The autotrophic denitrification filter media activation device according to claim 2, characterized in that a transverse running guide rail (12) is provided on the structural support platform (9), and a plurality of activation driving devices (13) are provided on the transverse running guide rail (12), and a transverse running unit (14) is provided on each activation driving device (13), and the activation driving device (13) is driven by the transverse running unit (14) to reciprocally slide on the transverse running guide rail (12).

5. The autotrophic denitrification filter media activation device according to claim 4, characterized in that the number of the activation driving devices (13) is the same as the number of the defined working areas, that is, there is one and only one activation driving device (13) in each defined working area; in the transverse direction, each activation driving device (13) reciprocally slides along the transverse running guide rail (12) in the defined working area.

6. The autotrophic denitrification filter media activation device according to claim 4, characterized in that the activation driving device (13) includes a driving motor, and the output shaft of the driving motor is connected to the spiral rod member (6), so as to drive the spiral rod member (6) to rotate in real time through the driving motor.

7. The autotrophic denitrification filter media activation device according to claim 6, characterized in that the filter media activation device further includes an electrical control system (15), the electrical control system (15) is signal-connected to the longitudinal operation unit (10), the transverse operation unit (14) and the activation driving device (13), so as to control the rotation of the spiral rod member (6) and at the same time control the activation driving device (13) to move along a predetermined trajectory in the defined working area, so that all the filter media layers (5) in the autotrophic denitrification filter are agitated without blind spots.

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