Two-stage short-cut denitrification-anaerobic ammonium oxidation dual-granular sludge treatment unit for wastewater treatment

Abstract

This invention discloses a two-stage short-cut denitrification-anaerobic ammonium oxidation dual-granular sludge device for wastewater treatment, comprising a nitrate nitrogen wastewater tank and a carbon source tank connected in parallel, a short-cut denitrification granular sludge reactor connected to both the nitrate nitrogen wastewater tank and the carbon source tank, and an anaerobic ammonium oxidation granular sludge reactor connected in series with the short-cut denitrification granular sludge reactor. The short-cut denitrification granular sludge reactor includes a short-cut denitrification tank with a first inlet at its lower end. The nitrate nitrogen wastewater tank is connected to the first inlet via a first inlet pump, and the carbon source tank is connected to the first inlet via a second inlet pump. This invention achieves decoupling of short-cut denitrification and anaerobic ammonium oxidation, avoiding the adverse effects of organic matter on anaerobic ammonium oxidation. The entire device is a completely continuous flow process, which, compared with existing technologies, effectively increases the production rate of nitrite nitrogen and can continuously and stably provide reaction substrates for anaerobic ammonium oxidation.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a two-stage short-cut denitrification-anaerobic ammonia oxidation dual-granular sludge device for wastewater treatment. Background Technology

[0002] Currently, the main process for denitrification in urban wastewater is the nitrification-denitrification process centered on activated sludge. This process suffers from high energy and chemical consumption, low volumetric nitrogen removal load, and large sludge production. In recent years, anammox has offered a new approach to nitrogen removal. Anammox is an autotrophic denitrification technology using ammonia nitrogen and nitrite nitrogen as substrates. Compared to traditional nitrification-denitrification, anammox has a high volumetric nitrogen removal load, saving over 60% of aeration. The anammox bacteria are autotrophic, requiring no organic matter, thus saving 100% of organic carbon sources. The remaining sludge production is only about 30%, reducing sludge treatment costs.

[0003] A stable supply of nitrite nitrogen is essential for maintaining anaerobic ammonium oxidation (ANAO). Currently, the commonly used methods for producing nitrite nitrogen in wastewater treatment are short-cut nitrification and short-cut denitrification. Compared to short-cut nitrification, short-cut denitrification requires less stringent condition control and is easier to achieve stable nitrite nitrogen production. Short-cut denitrification refers to controlling denitrification in the first step, allowing nitrite nitrogen to accumulate. This saves on the addition of organic carbon sources and reduces the production of greenhouse gases N2O and CO2. Combining short-cut denitrification with ANAO enables nitrogen removal under low-carbon conditions, aligning with the concept of synergistic efficiency in pollution reduction and carbon reduction.

[0004] Currently, most processes for producing nitrite nitrogen based on short-cut denitrification are intermittent processes. Due to ineffective operating time such as influent and effluent discharge, the volumetric loading rate is low, making it difficult to meet the high nitrite nitrogen production rate requirements of anammox. Continuous operation processes have a higher nitrite nitrogen production rate. Efficient sludge-water separation is the foundation for achieving high-load continuous operation, and the formation of granular sludge is an effective means to improve sludge settling. Therefore, for efficient and low-carbon nitrogen removal, the development of a short-cut denitrification-anammox dual granular sludge system based on continuous and stable nitrite nitrogen production is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a two-stage short-cut denitrification-anaerobic ammonium oxidation dual-granular sludge device for wastewater treatment, which has high total nitrogen removal efficiency and is easy to promote and apply in practical engineering.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A two-stage short-cut denitrification-anaerobic ammonium oxidation dual granular sludge device for wastewater treatment includes a nitrate nitrogen wastewater tank and a carbon source water tank connected in parallel, a short-cut denitrification granular sludge reactor connected together with the nitrate nitrogen wastewater tank and the carbon source water tank, and an anaerobic ammonium oxidation granular sludge reactor connected in series with the short-cut denitrification granular sludge reactor.

[0008] The short-cut denitrification granular sludge reactor includes a short-cut denitrification tank, with a first inlet at the lower end of the tank. A nitrate nitrogen wastewater tank is connected to the first inlet via a first inlet pump, and a carbon source tank is connected to the first inlet via a second inlet pump.

[0009] The short-range denitrification tank has a first outlet located near the upper part of its outer side.

[0010] The upper part of the inside of the short-range denitrification tank is fixed with a first three-phase separator, which has a first exhaust port.

[0011] A low-speed agitator is installed at the top of the short-cut denitrification tank, and the agitator shaft extends vertically into the interior of the short-cut denitrification tank.

[0012] The anaerobic ammonia oxidation granular sludge reactor includes an anaerobic ammonia oxidation tank. The bottom of the anaerobic ammonia oxidation tank has a second inlet. The second inlet is connected to an ammonia nitrogen wastewater tank. The ammonia nitrogen wastewater tank is connected to the second inlet through a third inlet pump.

[0013] The first outlet is connected to the second inlet via a pipe;

[0014] The anaerobic ammonia oxidation tank has a second water outlet near the upper part on the outside of the tank, and the second water outlet is connected to a water outlet tank through a pipe.

[0015] A second three-phase separator is fixed at the upper end of the anaerobic ammonia oxidation tank, and the second three-phase separator has a second exhaust port.

[0016] Preferably, a first insulating ring shell is fixedly surrounded on the outside of the short-range denitrification tank. The first insulating ring shell has a first insulating water inlet and a first insulating water outlet. Both the first insulating water inlet and the first insulating water outlet are connected to the first constant temperature water tank through pipes.

[0017] The first thermometer is located on the side wall of the first insulating ring shell.

[0018] Note: The activity of short-cut denitrifying microorganisms is quite sensitive to temperature. Different microorganisms can only exert their optimal metabolic function within specific temperature ranges. Generally speaking, the suitable temperature range for short-cut denitrifying bacteria is 25-35℃. Setting up appropriate heat-insulating structures can maintain microbial activity and stabilize the reaction rate.

[0019] Preferably, the anaerobic ammonia oxidation tank has a reflux liquid outlet near the upper part on the outer side, and a reflux liquid inlet at the bottom of the anaerobic ammonia oxidation tank. The reflux liquid outlet is connected to the reflux liquid inlet through a reflux pump.

[0020] Note: Anaerobic ammonia oxidation is very sensitive to environmental conditions, especially substrate concentration, pH value and temperature. Setting up reflux can make the environment inside the reactor more stable, and reflux can make the influent and anaerobic ammonia oxidation granular sludge in the reactor more fully contacted, allowing the substrate to diffuse more quickly to the surface of microbial cells inside the sludge particles.

[0021] Preferably, a second heat-insulating ring shell is fixedly surrounded on the outside of the anaerobic ammonia oxidation tank. The second heat-insulating ring shell has a second heat-insulating water inlet and a second heat-insulating water outlet. The second heat-insulating water inlet and the second heat-insulating water outlet are connected to a second constant temperature water tank through pipes.

[0022] The second thermometer is located on the side wall of the second insulating ring shell.

[0023] Note: Anaerobic ammonia oxidizing bacteria are quite sensitive to temperature, and their suitable temperature range is relatively narrow, usually around 30-35℃. However, the actual wastewater temperature may fluctuate greatly, especially in extreme weather conditions such as winter or summer, which can affect the denitrification efficiency of the device. Therefore, it is necessary to set up appropriate heat preservation structures to maintain a stable and suitable temperature inside the reactor.

[0024] Preferably, an oxygen deficiency control mechanism is provided between the first water inlet pump and the second water inlet pump and the first water inlet. The oxygen deficiency control mechanism includes an oxygen deficiency control support base, and multiple vertically extending oxygen deficiency control containment cylinders are fixed on the top of the oxygen deficiency control support base.

[0025] The top of the hypoxia control container is fixed with a negative pressure suction cylinder with its opening facing upwards, and a negative pressure suction piston is slidably connected inside the negative pressure suction cylinder.

[0026] A crankshaft support is fixed on the top of the hypoxia control support. A horizontally arranged negative pressure drive crankshaft is rotatably connected to the crankshaft support. The negative pressure drive crankshaft is connected to the negative pressure suction piston through the suction drive connecting rod.

[0027] The hypoxia control container has a hypoxia control input pipe near the lower end on the outer side, and a hypoxia control input control valve on the hypoxia control input pipe. The hypoxia control container has a hypoxia control output pipe near the upper end on the outer side, and a hypoxia control output control valve on the hypoxia control output pipe.

[0028] The bottom of the negative pressure vacuum cylinder is connected to the inside of the oxygen deficiency control container cylinder through a vacuum connecting pipe, and a vacuum control valve is fixed inside the vacuum connecting pipe.

[0029] The negative pressure exhaust pipe is located near the lower end of the outer side of the negative pressure exhaust cylinder, and the negative pressure exhaust pipe is equipped with a negative pressure exhaust control valve.

[0030] The negative pressure suction cylinder has an overflow pipe near the lower end on its outer side, and the overflow pipe has an overflow check valve.

[0031] The oxygen deficiency control input pipe is connected to the first and second water inlet pumps, and the oxygen deficiency control output pipe is connected to the first water inlet.

[0032] Note: Short-cut denitrification needs to be carried out in an anaerobic environment, and the requirements for dissolved oxygen are relatively strict. Excessive dissolved oxygen will inhibit the short-cut denitrification process and affect the accumulation of nitrite nitrogen. The subsequent anaerobic ammonia oxidation needs to be strictly controlled under anaerobic conditions. Even trace amounts of oxygen may have a toxic effect on anaerobic ammonia oxidizing bacteria. Therefore, an anaerobic control mechanism is set up to further control the dissolved oxygen in the influent.

[0033] Preferably, a crankshaft driven gear is fixed at one end of the negative pressure drive crankshaft, a crankshaft drive motor is fixed on the oxygen deficiency control support, a crankshaft drive gear is fixed on the output shaft of the crankshaft drive motor, and the crankshaft drive gear is meshed with the crankshaft driven gear.

[0034] Note: Gear transmission allows for precise control of the position of the negative pressure suction piston within the negative pressure suction cylinder.

[0035] Preferably, the anaerobic ammonia oxidation tank is provided with an effluent sludge barrier structure, which includes a sludge barrier receiving pipe fixed in the anaerobic ammonia oxidation tank and extending vertically through it. A sludge barrier column is fixed inside the sludge barrier receiving pipe, and the sludge barrier column has multiple effluent flow holes that extend spirally around the axis of the sludge barrier receiving pipe.

[0036] Multiple cleaning drive fixed cylinders are fixed on the inner wall of the sludge barrier containment pipe, arranged parallel to its axis. A cleaning drive sliding cylinder is slidably connected inside the cleaning drive fixed cylinder. A cleaning support ring is fixed at the outer end of the cleaning drive sliding cylinder, arranged coaxially with the sludge barrier containment pipe. A cleaning support turntable is rotatably connected to the inner side of the cleaning support ring. Multiple sludge cleaning pipes that spirally extend around the axis of the sludge barrier containment pipe are fixed on the cleaning support turntable. The multiple sludge cleaning pipes are slidably connected to each of the water outlet flow holes.

[0037] The cleaning drive fixed cylinder is equipped with a cleaning drive rod for driving the cleaning drive sliding cylinder to move.

[0038] Note: In actual operation, due to water flow impact, gas disturbance and other reasons, granular sludge may be lost, resulting in a decrease in sludge concentration in the reactor and affecting the treatment effect. Therefore, an effluent sludge barrier structure is set up to reduce the scouring and disturbance of sludge by water flow and gas, and to minimize the loss of granular sludge.

[0039] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects:

[0040] 1. The present invention has a reasonable structural design. The reactor used achieves decoupling of short-cut denitrification and anaerobic ammonium oxidation, avoiding the adverse effects of organic matter on anaerobic ammonium oxidation. The whole set of equipment is a completely continuous flow process. Compared with the currently common intermittent short-cut denitrification-continuous anaerobic ammonium oxidation two-stage process, it effectively improves the production rate of nitrite nitrogen, can continuously and stably provide reaction substrate for anaerobic ammonium oxidation, and does not require a separate storage tank for short-cut denitrification effluent, reducing the footprint and meeting the requirements of my country's increasingly scarce land resources for the construction of wastewater treatment plants.

[0041] 2. This invention is easy to operate. During the start-up phase of the short-cut denitrification granular sludge reactor, a strategy of shortening the HRT under an extremely low carbon-to-nitrogen ratio is adopted to cultivate the short-cut denitrification granular sludge, which greatly saves the carbon source required during the start-up phase; the COD / NO during the operation phase... 3- -N of 2.2 is sufficient to meet the requirements of deep denitrification. Compared with existing technologies, it can save 12-58% of carbon source and has lower carbon emissions. The low-speed agitator of the short-cut denitrification granular sludge reactor has a speed of only 10 rpm, which has the advantage of low energy consumption and provides an effective way to further achieve energy saving and consumption reduction in wastewater treatment.

[0042] 3. The reactor combination of the present invention is simple. Compared with the traditional nitrification and denitrification process, it does not require aeration or sludge return to the anoxic zone. The denitrification efficiency is not limited by the return ratio, and the operation and control are simple. The carbon source concentration and ammonia nitrogen influent can be dynamically adjusted according to the effluent conditions to maximize the denitrification efficiency. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall layout of the device of the present invention;

[0044] Figure 2 This is a schematic diagram of the hypoxia control mechanism of the present invention;

[0045] Figure 3 This is a left view of the oxygen deficiency control container of the present invention;

[0046] Figure 4 This is a schematic diagram of the effluent sludge barrier structure of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of granular sludge in the short-cut denitrification process of this invention;

[0048] Figure 6 This is a volume distribution diagram of the granular sludge of the present invention;

[0049] Figure 7 This is a water quality diagram showing the nitrite nitrogen concentration after the successful startup of the short-cut denitrification granular sludge reactor of this invention;

[0050] Figure 8 This is a water quality diagram showing the nitrate nitrogen removal rate after the successful startup of the short-cut denitrification granular sludge reactor of this invention;

[0051] Figure 9 This is a water quality diagram showing the nitrate nitrogen conversion rate after the successful startup of the short-cut denitrification granular sludge reactor of this invention;

[0052] Figure 10 This is a diagram showing the water quality during the stable operation phase of this invention.

[0053] In the diagram, 1-nitrate nitrogen wastewater tank, 2-carbon source water tank, 3-short-cut denitrification granular sludge reactor, 4-ammonia nitrogen wastewater tank, 5-anaerobic ammonia oxidation granular sludge reactor, 6-effluent tank, 31-first inlet pump, 32-second inlet pump, 33-first inlet, 34-first outlet, 35-low-speed stirrer, 36-first three-phase separator, 37-first exhaust port, 38-first constant temperature water bath, 380-first insulation ring shell, 39-first insulation inlet, 310- First insulated water outlet, 311-First thermometer, 50-Anaerobic ammonia oxidation tank, 51-Third inlet pump, 52-Second inlet, 53-Second outlet, 54-Second three-phase separator, 55-Second exhaust port, 56-Reflux outlet, 57-Reflux pump, 58-Reflux inlet, 59-Second constant temperature water bath, 590-Second insulated ring shell, 510-Second insulated water inlet, 511-Second insulated water outlet, 512-Second thermometer, 70-Anoxic control unit Structure, 71-Anoxic control support, 72-Anoxic control containment cylinder, 721-Anoxic control input pipe, 7210-Anoxic input control valve, 722-Anoxic control output pipe, 7220-Anoxic output control valve, 73-Negative pressure suction cylinder, 731-Negative pressure suction piston, 732-Suction connecting pipe, 7320-Suction control valve, 733-Negative pressure exhaust pipe, 7330-Negative pressure exhaust control valve, 734-Overflow pipe, 7340-Overflow check valve, 740-Crankshaft support Support, 74-Negative pressure drive crankshaft, 741-Air extraction drive connecting rod, 742-Crankshaft driven gear, 743-Crankshaft drive motor, 744-Crankshaft drive gear, 80-Effluent sludge barrier structure, 81-Sludge barrier receiving pipe, 82-Sludge barrier column, 820-Effluent flow hole, 830-Sludge cleaning pipe, 831-Cleaning drive fixed cylinder, 832-Cleaning drive sliding cylinder, 833-Cleaning support ring, 834-Cleaning support turntable, 835-Cleaning drive rod. Detailed Implementation

[0054] The following is combined Figures 1-10The present invention will be described in detail. For ease of description, the orientations mentioned below are defined as follows: The directions of up, down, left, right, front, and back mentioned below are consistent with the directions of up, down, left, right, front, and back in the projection relationship of the respective main view or structural schematic diagram.

[0055] Example 1: A two-stage short-cut denitrification-anaerobic ammonium oxidation dual-granular sludge treatment device for wastewater treatment, such as... Figure 1 As shown, it includes a nitrate nitrogen wastewater tank 1 and a carbon source water tank 2 arranged in parallel, a short-cut denitrification granular sludge reactor 3 connected together with the nitrate nitrogen wastewater tank 1 and the carbon source water tank 2, and an anaerobic ammonia oxidation granular sludge reactor 5 connected in series with the short-cut denitrification granular sludge reactor 3.

[0056] The short-cut denitrification granular sludge reactor 3 includes a short-cut denitrification tank 30, the lower end of which has a first inlet 33. The nitrate nitrogen wastewater tank 1 is connected to the first inlet 33 through a first inlet pump 31, and the carbon source tank 2 is connected to the first inlet 33 through a second inlet pump 32.

[0057] A schematic diagram of the short-cut denitrification granular sludge inside the short-cut denitrification granular sludge reactor 3 is shown below. Figure 5 As shown, the spatial distribution of short-cut denitrifying bacteria and filamentous bacteria highly overlaps, forming microparticles. A large number of microparticles gather in the core area of ​​the short-cut denitrifying granular sludge, reducing nitrate nitrogen to nitrite nitrogen. The exterior is composed of extracellular polymers secreted by microorganisms and a small number of other bacteria, which protect the internal short-cut denitrifying functional bacteria, provide an anaerobic environment, and form granular sludge.

[0058] The short-range denitrification tank 30 has a first outlet 34 located near the upper part on the outer side;

[0059] The upper part of the inside of the short-range denitrification tank 30 is fixed with a first three-phase separator 36, and the first three-phase separator 36 has a first exhaust port 37.

[0060] A low-speed agitator 35 is provided on the top of the short-cut denitrification tank 30, and the agitator shaft of the low-speed agitator 35 extends vertically into the interior of the short-cut denitrification tank 30.

[0061] The anaerobic ammonia oxidation granular sludge reactor 5 includes an anaerobic ammonia oxidation tank 50, the bottom of which has a second inlet 52. The second inlet 52 is connected to an ammonia nitrogen wastewater tank 4, which is connected to the second inlet 52 via a third inlet pump 51.

[0062] The first outlet 34 is connected to the second inlet 52 via a pipe;

[0063] The anaerobic ammonia oxidation granular sludge reactor 5 is inoculated with mature anaerobic ammonia oxidation granular sludge.

[0064] The anaerobic ammonia oxidation tank 50 has a second water outlet 53 near the upper end on the outside, and the second water outlet 53 is connected to a water outlet tank 6 via a pipe.

[0065] A second three-phase separator 54 is fixed at the upper end of the anaerobic ammonia oxidation tank 50, and the second three-phase separator 54 has a second exhaust port 55.

[0066] The short-range denitrification tank 30 is surrounded and fixed with a first heat-insulating ring shell 380. The first heat-insulating ring shell 380 has a first heat-insulating water inlet 39 and a first heat-insulating water outlet 310. The first heat-insulating water inlet 39 and the first heat-insulating water outlet 310 are both connected to the first constant temperature water tank 38 through pipes.

[0067] The first thermometer 311 is located on the side wall of the first insulating ring shell 380.

[0068] The anaerobic ammonia oxidation tank 50 has a reflux outlet 56 near the upper part on the outside, and a reflux inlet 58 at the bottom of the anaerobic ammonia oxidation tank 50. The reflux outlet 56 is connected to the reflux inlet 58 through a reflux pump 57.

[0069] The outer side of the anaerobic ammonia oxidation tank 50 is surrounded and fixed with a second heat-insulating ring shell 590. The second heat-insulating ring shell 590 has a second heat-insulating water inlet 510 and a second heat-insulating water outlet 511. The second heat-insulating water inlet 510 and the second heat-insulating water outlet 511 are connected to the second constant temperature water tank 59 through pipes.

[0070] The second thermometer 512 is located on the side wall of the second insulating ring shell 590.

[0071] Example 2: Based on Example 1, an oxygen deficiency control mechanism 70 is provided between the first inlet pump 31, the second inlet pump 32, and the first inlet 33, such as... Figure 2 As shown, the hypoxia control mechanism 70 includes a hypoxia control support 71, and a plurality of vertically extending hypoxia control receiving cylinders 72 are fixed on the top of the hypoxia control support 71.

[0072] The top of the hypoxia control container 72 is fixed with a negative pressure suction cylinder 73 with its opening facing upwards, and a negative pressure suction piston 731 is slidably connected inside the negative pressure suction cylinder 73.

[0073] A crankshaft support 740 is fixed to the top of the hypoxia control support 71. A horizontally arranged negative pressure drive crankshaft 74 is rotatably connected to the crankshaft support 740. The negative pressure drive crankshaft 74 is connected to the negative pressure suction piston 731 through the suction drive connecting rod 741.

[0074] One end of the vacuum drive connecting rod 741 is rotatably connected to the negative pressure drive crankshaft 74, and the other end of the vacuum drive connecting rod 741 is connected to the negative pressure vacuum piston 731 in the form of a fixed hinge, and the axis of rotation of the fixed hinge is parallel to the axis of rotation of the negative pressure drive crankshaft 74.

[0075] like Figure 3 As shown, an oxygen deficiency control input pipe 721 is located near the lower end of the outer side of the oxygen deficiency control container 72, and an oxygen deficiency input control valve 7210 is located on the oxygen deficiency control input pipe 721. An oxygen deficiency control output pipe 722 is located near the upper end of the outer side of the oxygen deficiency control container 72, and an oxygen deficiency output control valve 7220 is located on the oxygen deficiency control output pipe 722.

[0076] The bottom of the negative pressure vacuum cylinder 73 is connected to the interior of the oxygen deficiency control container 72 through the vacuum connecting pipe 732. The vacuum connecting pipe 732 is fixed with a vacuum control valve 7320.

[0077] The negative pressure exhaust pipe 733 is located near the lower end of the outer side of the negative pressure exhaust cylinder 73, and the negative pressure exhaust pipe 733 is equipped with a negative pressure exhaust control valve 7330.

[0078] The negative pressure vacuum cylinder 73 has an overflow pipe 734 near the lower end on its outer side, and an overflow check valve 7340 is provided on the overflow pipe 734.

[0079] The oxygen deficiency control input pipe 721 is connected to the first water inlet pump 31 and the second water inlet pump 32, and the oxygen deficiency control output pipe 722 is connected to the first water inlet 33.

[0080] like Figure 2 As shown, a crankshaft driven gear 742 is fixed at one end of the negative pressure drive crankshaft 74, a crankshaft drive motor 743 is fixed on the oxygen deficiency control support 71, a crankshaft drive gear 744 is fixed on the output shaft of the crankshaft drive motor 743, and the crankshaft drive gear 744 is meshed with the crankshaft driven gear 742.

[0081] Example 3: Based on Example 2, such as Figure 1 As shown, the anaerobic ammonia oxidation tank 50 is equipped with an effluent sludge barrier structure 80, such as... Figure 4 As shown, the effluent sludge barrier structure 80 includes a sludge barrier receiving pipe 81 that is fixed inside the anaerobic ammonia oxidation tank 50 and runs vertically through it. A sludge barrier column 82 is fixed inside the sludge barrier receiving pipe 81. The sludge barrier column 82 has a plurality of effluent flow holes 820 that extend spirally around the axis of the sludge barrier receiving pipe 81.

[0082] Multiple cleaning drive fixed cylinders 831 are fixed on the inner wall of the sludge barrier receiving pipe 81, arranged parallel to its axis. The cleaning drive fixed cylinder 831 is located above the sludge barrier column 82 and its open end faces the sludge barrier column 82. A cleaning drive sliding cylinder 832 is slidably connected inside the cleaning drive fixed cylinder 831. A cleaning support ring 833 is fixed at the outer end of the cleaning drive sliding cylinder 832 and arranged coaxially with the sludge barrier receiving pipe 81. A cleaning support turntable 834 is rotatably connected to the inner side of the cleaning support ring 833. Multiple sludge cleaning pipes 830 that spirally extend around the axis of the sludge barrier receiving pipe 81 are fixed on the cleaning support turntable 834. The multiple sludge cleaning pipes 830 are slidably connected one-to-one in each of the water outlet flow holes 820.

[0083] The cleaning drive fixed cylinder 831 is provided with a cleaning drive rod 835 for driving the cleaning drive sliding cylinder 832 to move. The cleaning drive rod 835 is an existing electric telescopic rod. The outer end of the cleaning drive rod 835 is fixedly connected to the top of the cleaning drive fixed cylinder 831, and the inner end of the cleaning drive rod 835 is fixedly connected to the bottom of the cleaning drive sliding cylinder 832.

[0084] The working principle of the hypoxia control mechanism 70 is as follows:

[0085] The output ends of the first inlet pump 31 and the second inlet pump 32 are connected to the anoxic control input pipe 721, which is used to transport the sewage in the nitrate nitrogen wastewater tank 1 and the carbon source water tank 2 to the inside of the anoxic control container 72. The anoxic control output pipe 722 is connected to the first inlet 33, so that the sewage in the anoxic control container 72 can be transported to the inside of the short-range denitrification tank 30 through the first inlet 33.

[0086] The crankshaft drive motor 743 is a servo motor of the prior art. The output shaft of the crankshaft drive motor 743 drives the negative pressure drive crankshaft 74 to rotate through the meshing of the crankshaft drive gear 744 and the crankshaft driven gear 742. The negative pressure drive crankshaft 74 converts the rotational motion into the linear motion of the negative pressure suction piston 731 through the crank-connecting rod structure. The rotation of the negative pressure drive crankshaft 74 drives the negative pressure suction piston 731 to reciprocate along the axis of the negative pressure suction cylinder 73 through the suction drive connecting rod 741.

[0087] With attachment Figure 3 For example, the movement of the negative pressure suction piston 731 from bottom to top is set as the suction stroke, and the movement of the negative pressure suction piston 731 from top to bottom is set as the exhaust stroke.

[0088] Wastewater enters through the anoxic control input pipe 721, and when the anoxic control container 72 is full, the wastewater is discharged through the anoxic control output pipe 722.

[0089] During the suction stroke, when the negative pressure suction piston 731 is at its lowest point;

[0090] Valve status 1:

[0091] Oxygen deficiency input control valve 7210: Closed;

[0092] Oxygen deficiency output control valve 7220: Closed;

[0093] Air extraction control valve 7320: Open;

[0094] Negative pressure exhaust control valve 7330: Closed;

[0095] During the suction stroke, the negative pressure suction piston 731 moves from bottom to top, and the volume of the negative pressure suction cylinder 73 expands. Under the action of negative pressure, the gas dissolved in the sewage forms microbubbles that escape from the sewage and enter the interior of the negative pressure suction cylinder 73 through the suction control valve 7320.

[0096] After the negative pressure suction piston 731 reaches its highest point, it then enters the exhaust stroke;

[0097] Valve status 2:

[0098] Oxygen deficiency input control valve 7210: Open;

[0099] Oxygen deficiency output control valve 7220: Open;

[0100] Air extraction control valve 7320: Closed;

[0101] Negative pressure exhaust control valve 7330: Open;

[0102] During the exhaust stroke, the inside of the negative pressure suction cylinder 73 is compressed, and the gas that escapes from the sewage is discharged through the negative pressure exhaust pipe 733.

[0103] Meanwhile, wastewater continues to be input from the anoxic control input pipe 721, and the input volume at one time is 70% of the volume of the anoxic control container 72, replacing the wastewater that has just been treated by negative pressure. The wastewater treated by negative pressure is discharged from the anoxic control output pipe 722, and the re-input wastewater continues to be treated by negative pressure in the next air extraction stroke.

[0104] After the exhaust stroke is completed, the negative pressure suction piston 731 returns to its lowest point;

[0105] Valve status 1:

[0106] Oxygen deficiency input control valve 7210: Closed;

[0107] Oxygen deficiency output control valve 7220: Closed;

[0108] Air extraction control valve 7320: Open;

[0109] Negative pressure exhaust control valve 7330: Closed;

[0110] Re-enter the suction stroke;

[0111] The pumping and venting cycles are repeated in this manner, and each valve also performs valve state 1 and valve state 2 accordingly, continuously treating the sewage under negative pressure to eliminate dissolved oxygen in the sewage as much as possible.

[0112] During the upward flow of wastewater in the anaerobic ammonia oxidation tank 50, when passing through the effluent sludge barrier structure 80, the wastewater flows upward through each effluent flow hole 820 and the sludge cleaning pipe 830.

[0113] The sludge carried in the sewage will be trapped in each of the effluent flow holes 820 to minimize the loss of sludge.

[0114] The inner rod of the cleaning drive rod 835 extends and drives the cleaning drive sliding cylinder 832, together with the cleaning support ring 833, the cleaning support turntable 834 and each sludge cleaning pipe 830, to move downward. As the sludge cleaning pipe 830 moves spirally along the water outlet flow hole 820, the cleaning support turntable 834 rotates adaptively in the cleaning support ring 833.

[0115] The sludge trapped in the various water outlet holes 820 is removed by the sludge cleaning pipe 830, and the removed sludge returns to the bottom of the anaerobic ammonia oxidation tank 50 under its own weight.

[0116] Afterwards, the inner rod of the cleaning drive rod 835 retracts, causing the cleaning drive sliding cylinder 832, along with the cleaning support ring 833, the cleaning support turntable 834, and each sludge cleaning pipe 830, to move upwards back to the high position.

[0117] Experimental Example: To verify the effectiveness of the two-stage short-cut denitrification-anaerobic ammonia oxidation dual-granular sludge device for wastewater treatment in this application, flocculent sludge from the anoxic tank of an actual wastewater treatment plant was collected as an example and treated using the device of this application.

[0118] The test method is as follows:

[0119] (1) First stage:

[0120] Short-cut denitrification granular sludge reactor 3: Flocculent sludge from the anoxic tank of an actual wastewater treatment plant was collected, allowed to settle for 2 hours, and the supernatant was discarded to obtain concentrated sludge with a concentration of approximately 10.35 g / L. 1.0 L of this concentrated sludge was inoculated into the short-cut denitrification tank 30 of the short-cut denitrification granular sludge reactor 3. The nitrate nitrogen concentration in nitrate nitrogen wastewater tank 1 was approximately 50 mg / L. The nitrate nitrogen influent flow rate gradually increased to 250, 500, 1000, and 2000 mL / h, corresponding to HRTs of 8, 4, 2, and 1 h, respectively. The carbon source water tank 2 influent flow rate gradually increased to one-tenth of the nitrate nitrogen influent flow rate, i.e., 25, 50, 100, and 200 mL / h. COD was provided by sodium acetate. The concentration is approximately 500 mg / L, and the COD / NO3--N ratio is 1.0. The first inlet 33 is a three-way valve. The nitrate nitrogen inlet water is transported by the first inlet pump 31, and the carbon source inlet water is transported by the second inlet pump 32. After the nitrate nitrogen inlet water and the carbon source inlet water merge at the three-way valve, they enter the short-cut denitrification tank 30 from the first inlet 33. The nitrate nitrogen inlet water and the carbon source inlet water flow from bottom to top through the sludge layer in the short-cut denitrification tank 30. At the first three-phase separator 36, the sludge, water and gas are efficiently separated. The gas escapes from the middle of the first three-phase separator 36 through the first exhaust port 37, and the water flows upward from the gap between the first three-phase separator 36 and the inner wall of the short-cut denitrification tank 30 and is discharged through the first outlet 34.

[0121] During the start-up phase, when sludge floats to the surface in the short-cut denitrification tank 30, the low-speed agitator 35 is turned on. The large sludge agglomerates that float to the surface are dispersed under the action of hydraulic shear. After the bubbles are released, the sludge settles to the bottom area of ​​the short-cut denitrification tank 30. The low-speed agitator 35 is turned off after no more sludge floats to the surface.

[0122] When the volume percentage of sludge particles larger than 0.5 mm reaches more than 70%, it indicates that granular sludge formation is successful. Figure 9 As shown; when the conversion rate of nitrate nitrogen to nitrite nitrogen is maintained at around 60%, and the ratio of nitrogen loss (i.e., the amount converted into nitrogen gas) to the total influent nitrate nitrogen is maintained at around 11%, it indicates that the short-cut denitrification functional bacteria are in a dominant position, and the short-cut denitrification granular sludge is successfully formed. At this time, the COD / NO3--N ratio is gradually increased; the COD concentration is increased successively at 750, 1000, and 1100, and the corresponding COD / NO3--N ratios are 1.5, 2.0, and 2.2. The low-speed agitator 35 is kept on and the speed is set to 10 rpm.

[0123] The continuous experimental results show that the nitrite nitrogen concentration in the effluent of the short-cut denitrification granular sludge reactor 3 is 30.6±1.6 mg / L, the nitrate nitrogen removal rate is 95.0±2.3%, and the conversion rate of nitrate nitrogen to nitrite nitrogen is 70.5±4.2%, indicating that the short-cut denitrification granular sludge reactor 3 has been successfully started up. At this time, the effluent discharged from the first outlet 34 enters the anaerobic ammonia oxidation granular sludge reactor 5.

[0124] (2) Second stage:

[0125] Start-up of anaerobic ammonia oxidation granular sludge reactor 5: Mature anaerobic ammonia oxidation granular sludge is inoculated into anaerobic ammonia oxidation granular sludge reactor 5, with an inoculation sludge concentration of approximately 22.8 g / L; the ammonia nitrogen concentration in ammonia nitrogen wastewater tank 4 is approximately 50 mg / L, and the influent flow rate is calculated as 1000 mL / h according to the formula Q = (2200 * c) / (1.32 * 50), where c is the nitrite nitrogen concentration (mg / L) in the effluent from the short-cut denitrification granular sludge reactor; a three-way valve is located at the second inlet 52, and ammonia nitrogen influent is transported by the third influent pump 51. The ammonia nitrogen influent and the first... The water from outlet 34 merges with the three-way valve at the second inlet 52 and enters the anaerobic ammonia oxidation tank 50 together. The ammonia nitrogen inlet water and the water from outlet 34 flow from bottom to top through the sludge layer in the anaerobic ammonia oxidation tank 50. At the second three-phase separator 54, sludge, water and gas are efficiently separated. The gas escapes from the middle of the second three-phase separator 54 through the second exhaust port 55. The water flows upward from the gap between the second three-phase separator 54 and the inner wall of the anaerobic ammonia oxidation tank 50 and is discharged through the second outlet 53. The water discharged from the second outlet 53 enters the outlet tank 6.

[0126] The reflux ratio from reflux outlet 56 to reflux inlet 58 is set to 100%.

[0127] (3) Third stage:

[0128] The system operates stably: the effective volumes of the short-cut denitrification granular sludge reactor 3 and the anammox granular sludge reactor 5 are the same; the nitrate nitrogen influent concentration is approximately 50 mg / L, and the flow rate is 2000 mL / h; the carbon source influent COD concentration is approximately 500 mg / L, and the flow rate is 200 mL / h; the ammonia nitrogen concentration is approximately 50 mg / L, and the flow rate is calculated according to the formula Q = (2200*c) / (1.32*50) as 1000 mL / h, where c is the nitrite nitrogen concentration (mg / L) in the effluent of the short-cut denitrification granular sludge reactor, and the COD / NO3--N ratio is 2.2; the low-speed stirrer 35 rotates at 10 rpm; the reflux ratio from the reflux outlet 56 to the reflux inlet 58 in the anammox granular sludge reactor 5 is 100%, i.e., 3200 mL / h;

[0129] Continuous experimental results show that after stable operation, the concentration of ammonia nitrogen in the effluent of the system is below 1.0 mg / L, the concentration of nitrate nitrogen is below 5.0 mg / L, and the concentration of total nitrogen is below 10.0 mg / L for 14 consecutive days. The removal rate of ammonia nitrogen reaches 96.3%-99.2%, the removal rate of nitrate nitrogen reaches 83.9%-98.8%, and the removal rate of total nitrogen reaches 82.3%-93.9%, which meets the Class A standard in the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants" GB18918-2002.

[0130] The above experimental analysis shows that the sludge device of the present invention adopts a strategy of shortening the HRT under an extremely low carbon-to-nitrogen ratio to cultivate short-cut denitrification granular sludge during the start-up stage of the short-cut denitrification granular sludge reactor, which greatly saves the carbon source required during the start-up stage; the COD / NO3-N ratio of 2.2 during the operation stage can meet the requirements of deep denitrification, which can save 12-58% of the carbon source compared with the prior art, resulting in lower carbon emissions; the low-speed agitator of the short-cut denitrification granular sludge reactor has a speed of only 10 rpm, which has the advantage of low energy consumption.

Claims

1. A two-stage short-cut denitrification-anaerobic ammonium oxidation dual-granular sludge treatment device for wastewater treatment, characterized in that, It includes a nitrate nitrogen wastewater tank (1) and a carbon source water tank (2) connected in parallel, a short-cut denitrification granular sludge reactor (3) connected together with the nitrate nitrogen wastewater tank (1) and the carbon source water tank (2), and an anaerobic ammonia oxidation granular sludge reactor (5) connected in series with the short-cut denitrification granular sludge reactor (3). The short-cut denitrification granular sludge reactor (3) includes a short-cut denitrification tank (30), the lower end of which has a first inlet (33). The nitrate nitrogen wastewater tank (1) is connected to the first inlet (33) through a first inlet pump (31), and the carbon source tank (2) is connected to the first inlet (33) through a second inlet pump (32). The short-range denitrification tank (30) has a first outlet (34) on its outer side near the upper end. The upper part of the inside of the short-range denitrification tank (30) is fixed with a first three-phase separator (36), and the first three-phase separator (36) has a first exhaust port (37). The top of the short-range denitrification tank (30) is provided with a low-speed agitator (35), and the agitator shaft of the low-speed agitator (35) extends vertically into the interior of the short-range denitrification tank (30). The anaerobic ammonia oxidation granular sludge reactor (5) includes an anaerobic ammonia oxidation tank (50), the bottom of which has a second inlet (52), and the second inlet (52) is connected to an ammonia nitrogen wastewater tank (4), which is connected to the second inlet (52) via a third inlet pump (51); The first outlet (34) is connected to the second inlet (52) through a pipe; The anaerobic ammonia oxidation tank (50) has a second outlet (53) near the upper end on the outside, and the second outlet (53) is connected to an outlet tank (6) through a pipe. The upper end of the anaerobic ammonia oxidation tank (50) is fixed with a second three-phase separator (54), and the second three-phase separator (54) has a second exhaust port (55). An oxygen deficiency control mechanism (70) is provided between the first water inlet pump (31) and the second water inlet pump (32) and the first water inlet (33). The oxygen deficiency control mechanism (70) includes an oxygen deficiency control support (71), and a plurality of vertically extending oxygen deficiency control containment cylinders (72) are fixed on the top of the oxygen deficiency control support (71). The top of the hypoxia control container (72) is fixed with a negative pressure suction cylinder (73) facing upwards, and a negative pressure suction piston (731) is slidably connected inside the negative pressure suction cylinder (73). The top of the hypoxia control support (71) is fixed with a crankshaft support (740), and a horizontally arranged negative pressure drive crankshaft (74) is rotatably connected to the crankshaft support (740). The negative pressure drive crankshaft (74) is connected to the negative pressure suction piston (731) through a suction drive connecting rod (741). The hypoxia control container (72) has a hypoxia control input pipe (721) near the lower end on the outside, and a hypoxia input control valve (7210) on the hypoxia control input pipe (721). The hypoxia control container (72) has a hypoxia control output pipe (722) near the upper end on the outside, and a hypoxia output control valve (7220) on the hypoxia control output pipe (722). The bottom of the negative pressure vacuum cylinder (73) is connected to the interior of the oxygen deficiency control container (72) through a vacuum connecting pipe (732), and a vacuum control valve (7320) is fixed inside the vacuum connecting pipe (732). The negative pressure exhaust pipe (733) is located near the lower end of the outer side of the negative pressure exhaust cylinder (733), and the negative pressure exhaust pipe (733) is equipped with a negative pressure exhaust control valve (7330). The negative pressure suction cylinder (73) has an overflow pipe (734) near the lower end on its outer side, and the overflow pipe (734) has an overflow check valve (7340). The hypoxia control input pipe (721) is connected to the first water inlet pump (31) and the second water inlet pump (32), and the hypoxia control output pipe (722) is connected to the first water inlet (33).

2. The two-stage short-cut denitrification-anaerobic ammonium oxidation dual-granular sludge treatment device for wastewater treatment according to claim 1, characterized in that, The short-range denitrification tank (30) is surrounded and fixed with a first heat-insulating ring shell (380). The first heat-insulating ring shell (380) has a first heat-insulating water inlet (39) and a first heat-insulating water outlet (310). The first heat-insulating water inlet (39) and the first heat-insulating water outlet (310) are both connected to the first constant temperature water tank (38) through pipes. The first thermal insulation ring shell (380) has a first thermometer (311) on its side wall.

3. The two-stage short-cut denitrification-anaerobic ammonium oxidation dual-granular sludge treatment device for wastewater treatment according to claim 1, characterized in that, The anaerobic ammonia oxidation tank (50) has a reflux outlet (56) near the upper part on the outside, and a reflux inlet (58) at the bottom of the anaerobic ammonia oxidation tank (50). The reflux outlet (56) is connected to the reflux inlet (58) through a reflux pump (57).

4. The two-stage short-cut denitrification-anaerobic ammonium oxidation dual-granular sludge treatment device for wastewater treatment according to claim 1, characterized in that, The anaerobic ammonia oxidation tank (50) is surrounded and fixed with a second heat-insulating ring shell (590). The second heat-insulating ring shell (590) has a second heat-insulating water inlet (510) and a second heat-insulating water outlet (511). The second heat-insulating water inlet (510) and the second heat-insulating water outlet (511) are connected to the second constant temperature water tank (59) through pipes. The second insulation ring shell (590) has a second thermometer (512) on its side wall.

5. The two-stage short-cut denitrification-anaerobic ammonium oxidation dual-granular sludge treatment device for wastewater treatment according to claim 1, characterized in that, One end of the negative pressure drive crankshaft (74) is fixed with a crankshaft driven gear (742), and a crankshaft drive motor (743) is fixed on the hypoxia control support (71). A crankshaft drive gear (744) is fixed on the output shaft of the crankshaft drive motor (743), and the crankshaft drive gear (744) meshes with the crankshaft driven gear (742).

6. The two-stage short-cut denitrification-anaerobic ammonium oxidation dual-granular sludge treatment device for wastewater treatment according to claim 1, characterized in that, The anaerobic ammonia oxidation tank (50) is provided with an effluent sludge barrier structure (80). The effluent sludge barrier structure (80) includes a sludge barrier receiving pipe (81) that is fixed inside the anaerobic ammonia oxidation tank (50) and runs vertically through it. A sludge barrier column (82) is fixed inside the sludge barrier receiving pipe (81). The sludge barrier column (82) has a plurality of effluent flow holes (820) that extend spirally around the axis of the sludge barrier receiving pipe (81). Multiple cleaning drive fixed cylinders (831) arranged parallel to its axis are fixed on the inner wall of the sludge barrier receiving pipe (81). A cleaning drive sliding cylinder (832) is slidably connected inside the cleaning drive fixed cylinder (831). A cleaning support ring (833) arranged coaxially with the sludge barrier receiving pipe (81) is fixed at the outer end of the cleaning drive sliding cylinder (832). A cleaning support turntable (834) is rotatably connected inside the cleaning support ring (833). Multiple sludge cleaning pipes (830) spirally extending around the axis of the sludge barrier receiving pipe (81) are fixed on the cleaning support turntable (834). The multiple sludge cleaning pipes (830) are slidably connected one-to-one in each of the water outlet flow holes (820). The cleaning drive fixed cylinder (831) is provided with a cleaning drive rod (835) for driving the cleaning drive sliding cylinder (832) to move.

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