Two-stage short-cut denitrification-anaerobic ammonia oxidation double-granule sludge device for sewage treatment

Abstract

The invention discloses a two-stage short-cut denitrification-anaerobic ammonia oxidation double-granule sludge device for sewage treatment. Comprising a nitrate nitrogen wastewater tank and a carbon source water tank which are arranged in parallel, a short-cut denitrification granular sludge reactor which is jointly connected with the nitrate nitrogen wastewater tank and the carbon source water tank, and an anaerobic ammonia oxidation granular sludge reactor which is connected with the short-cut denitrification granular sludge reactor in series, the short-cut denitrification granular sludge reactor comprises a short-cut denitrification tank body, a first water inlet is formed in the lower end of the short-cut denitrification tank body, the nitrate nitrogen wastewater tank is communicated with the first water inlet through a first water inlet pump, and the carbon source water tank is communicated with the first water inlet through a second water inlet pump; according to the invention, short-cut denitrification and anaerobic ammonia oxidation decoupling are realized, and adverse effects of organic matters on anaerobic ammonia oxidation are avoided; the whole set of device is a complete continuous flow process, and compared with the process in the prior art, the production rate of nitrite nitrogen is effectively improved, and a reaction substrate can be continuously and stably provided for anaerobic ammonia oxidation.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a two-stage short-range denitrification-anaerobic ammonia oxidation double-granular sludge device for sewage treatment. Background Art

[0002] At present, the main process for denitrification of urban sewage is the nitrification and denitrification process with the activated sludge method as the core, which has problems such as high energy consumption and drug consumption, low volume denitrification load, and large sludge production. In recent years, the anaerobic ammonium oxidation process has provided a new idea for denitrification. Anaerobic ammonium oxidation is an autotrophic denitrification technology with ammonia nitrogen and nitrite nitrogen as substrates. Compared with traditional nitrification and denitrification, anaerobic ammonium oxidation has a high volume denitrification load and can save more than 60% of aeration. Anaerobic ammonium oxidation bacteria are autotrophic bacteria and do not require organic matter. They can save 100% of organic carbon sources, and the residual sludge production is only about 30%, which can reduce the cost of sludge treatment.

[0003] A stable supply of nitrite nitrogen is a necessary condition for maintaining the anaerobic ammonium oxidation reaction. At present, the commonly used methods for producing nitrite nitrogen in sewage treatment are short-term nitrification and short-term denitrification. Compared with short-term nitrification, short-term denitrification does not require strict condition control and is easier to achieve stable nitrite nitrogen production. Short-term denitrification refers to controlling denitrification in the first step to accumulate nitrite nitrogen. It can save the addition of organic carbon sources and reduce the production of greenhouse gases N2O and CO2. The combination of short-term denitrification and anaerobic ammonium oxidation can remove nitrogen under low-carbon conditions, which is in line with the concept of synergistic efficiency of pollution reduction and carbon reduction.

[0004] At present, most of the processes for producing nitrite nitrogen based on short-term denitrification are intermittent operation processes. Due to the ineffective operation time such as water intake and drainage, the volume load is low, which makes it difficult to meet the high production rate requirements of anaerobic ammonium oxidation for nitrite nitrogen. The continuous operation process has a higher nitrite nitrogen production rate. The efficient mud-water separation effect is the basis for achieving high-load continuous operation. The formation of granular sludge is an effective means to improve the sludge settling effect. Therefore, in order to achieve efficient and low-carbon denitrification, it is urgent to develop a short-term denitrification-anaerobic ammonium oxidation dual granular sludge system based on continuous and stable production of nitrite nitrogen. Summary of the invention

[0005] The object of the present invention is to provide a two-stage short-range denitrification-anaerobic ammonia oxidation dual-granular sludge device for sewage treatment, which has high total nitrogen removal efficiency and is easy to promote and apply in actual projects.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A two-stage short-range denitrification-anaerobic ammonium oxidation dual granular sludge device for sewage treatment, comprising a nitrate nitrogen wastewater tank and a carbon source water tank arranged in parallel, a short-range denitrification granular sludge reactor connected to 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-range denitrification granular sludge reactor;

[0008] The short-distance denitrification granular sludge reactor comprises a short-distance denitrification tank body, the lower end of the short-distance denitrification tank body is provided with a first water inlet, the nitrate nitrogen wastewater tank is connected to the first water inlet through a first water inlet pump, and the carbon source water tank is connected to the first water inlet through a second water inlet pump;

[0009] The outer side of the short-range denitrification tank body is provided with a first water outlet near the upper end;

[0010] A first three-phase separator is fixed at the upper end of the short-range denitrification tank, and a first exhaust port is provided on the first three-phase separator;

[0011] A low-speed agitator is provided on the top of the short-range denitrification tank, and the agitation shaft of the low-speed agitator extends vertically into the interior of the short-range denitrification tank;

[0012] The anaerobic ammonium oxidation granular sludge reactor comprises an anaerobic ammonium oxidation tank body, the bottom of the anaerobic ammonium oxidation tank body is provided with a second water inlet, the second water inlet is connected to an ammonia nitrogen sewage tank, and the ammonia nitrogen sewage tank is connected to the second water inlet through a third water inlet pump;

[0013] The first water outlet is connected to the second water inlet through a pipeline;

[0014] A second water outlet is provided on the outer side of the anaerobic ammonium oxidation tank near the upper end, and the second water outlet is connected to a water outlet box through a pipeline;

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

[0016] Preferably, a first heat-insulating ring shell is fixedly surrounded on the outer side of the short-range denitrification tank body, and the first heat-insulating ring shell has a first heat-insulating water inlet and a first heat-insulating water outlet, and the first heat-insulating water inlet and the first heat-insulating water outlet are both connected to the first constant-temperature water tank through a pipeline;

[0017] A first thermometer is arranged on the side wall of the first heat-insulating ring shell.

[0018] Note: The activity of short-range denitrifying microorganisms is sensitive to temperature. Different microorganisms can only perform their best metabolic functions within a specific temperature range. Generally speaking, the suitable temperature range for short-range denitrifying bacteria is 25-35°C. Setting up a corresponding insulation structure can maintain the activity of microorganisms and stabilize the reaction rate.

[0019] Preferably, the outer side of the anaerobic ammonium oxidation tank body is provided with a reflux liquid outlet near the upper end, and the bottom of the anaerobic ammonium oxidation tank body is provided with a reflux liquid inlet, and the reflux liquid outlet is connected to the reflux liquid inlet through a reflux pump.

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

[0021] Preferably, a second insulation ring shell is fixedly surrounded on the outside of the anaerobic ammonia oxidation tank body, and a second insulation water inlet and a second insulation water outlet are provided on the second insulation ring shell, and the second insulation water inlet and the second insulation water outlet are connected to the second constant temperature water tank through a pipeline;

[0022] A second thermometer is arranged on the side wall of the second heat-insulating ring shell.

[0023] Note: Anaerobic ammonia-oxidizing bacteria are sensitive to temperature, and their suitable temperature range is relatively narrow, usually around 30-35°C. The actual sewage temperature may fluctuate greatly, especially in extreme climatic conditions such as winter or summer, which will affect the denitrification efficiency of the device. Therefore, it is necessary to set up a corresponding insulation structure to maintain a stable and suitable temperature in 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, and the oxygen deficiency control mechanism comprises an oxygen deficiency control support seat, and a plurality of vertically extending oxygen deficiency control containing cylinders are fixed on the top of the oxygen deficiency control support seat;

[0025] A negative pressure pump with an upward opening is fixed on the top of the hypoxia control container, and a negative pressure pump piston is slidably connected inside the negative pressure pump.

[0026] A crankshaft support seat is fixed on the top of the hypoxia control support seat, and a horizontally arranged negative pressure driving crankshaft is rotatably connected to the crankshaft support seat, and the negative pressure driving crankshaft is connected to the negative pressure suction piston through a suction driving connecting rod;

[0027] The outer side of the hypoxia control containing tube is provided with a hypoxia control input tube near the lower end, and the hypoxia control input tube is provided with a hypoxia input control valve; the outer side of the hypoxia control containing tube is provided with a hypoxia control output tube near the upper end, and the hypoxia control output tube is provided with a hypoxia output control valve;

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

[0029] A negative pressure exhaust pipe is provided near the lower end of the negative pressure exhaust cylinder, and a negative pressure exhaust control valve is provided on the negative pressure exhaust pipe;

[0030] An overflow pipe is provided on the outer side of the negative pressure vacuum cylinder near the lower end, and an overflow one-way valve is provided on the overflow pipe;

[0031] The hypoxia control input pipe is connected to the first water inlet pump and the second water inlet pump, and the hypoxia control output pipe is connected to the first water inlet.

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

[0033] Preferably, a crankshaft driven gear is fixed to one end of the negative pressure drive crankshaft, a crankshaft drive motor is fixed to the hypoxia control support seat, a crankshaft drive gear is fixed to the output shaft of the crankshaft drive motor, and the crankshaft drive gear is meshingly connected with the crankshaft driven gear.

[0034] Description: The operating position of the negative pressure suction piston in the negative pressure suction cylinder can be accurately controlled through gear transmission.

[0035] Preferably, an effluent sludge barrier structure is provided in the anaerobic ammonium oxidation tank body, and the effluent sludge barrier structure comprises a sludge barrier containing pipe fixed in the anaerobic ammonium oxidation tank body and vertically passing through, a sludge barrier column is fixed in the sludge barrier containing pipe, and the sludge barrier column has a plurality of effluent flow holes extending spirally around the axis of the sludge barrier containing pipe;

[0036] A plurality of cleaning drive fixed cylinders arranged parallel to the axis of the sludge barrier containing tube are fixed on the inner side wall thereof, a cleaning drive sliding cylinder is slidably connected inside the cleaning drive fixed cylinder, a cleaning support ring coaxially arranged with the sludge barrier containing tube is fixed on the outer end of the cleaning drive sliding cylinder, a cleaning support turntable is rotatably connected inside the cleaning support ring, a plurality of sludge cleaning tubes spirally extending around the axis of the sludge barrier containing tube are fixed on the cleaning support turntable, and the plurality of sludge cleaning tubes are slidably connected in each water outlet flow hole one by one;

[0037] A cleaning driving rod for driving the cleaning driving sliding cylinder to move is arranged in the cleaning driving fixed cylinder.

[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 minimize the loss of granular sludge.

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

[0040] 1. The structure of the present invention is reasonably designed. The reactor used realizes the decoupling of short-range denitrification and anaerobic ammonium oxidation, avoiding the adverse effects of organic matter on anaerobic ammonium oxidation. The whole set of equipment is a complete continuous flow process. Compared with the currently common intermittent short-range denitrification-continuous anaerobic ammonium oxidation two-stage process, it effectively improves the production rate of nitrite nitrogen, can continuously and stably provide reaction substrates for anaerobic ammonium oxidation, and does not need to set up a water storage tank for short-range denitrification effluent, which reduces the occupied space and meets the requirements of my country's increasingly scarce land resources for the construction of sewage treatment plants;

[0041] 2. The present invention is easy to operate. During the startup phase of the short-range denitrification granular sludge reactor, a strategy of shortening HRT at an extremely low carbon-nitrogen ratio is adopted to cultivate the short-range denitrification granular sludge, which greatly saves the carbon source required in the startup phase; the COD / NO 3- -N is 2.2, which can meet the requirements of deep denitrification. Compared with the existing technology, it can save 12-58% of carbon sources and has lower carbon emissions. The low-speed agitator speed of the short-range denitrification granular sludge reactor is only 10rpm, which has the advantage of low energy consumption and provides an effective way to further achieve energy conservation and consumption reduction in sewage 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, does not require sludge to be returned to the anoxic section, the denitrification efficiency is not limited by the reflux ratio, and the operation control is simple. The carbon source concentration and the ammonia nitrogen inlet can be dynamically adjusted according to the effluent conditions to maximize the denitrification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0045] Figure 3 It is a left side view of the hypoxia control containing cylinder of the present invention;

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

[0047] Figure 5 It is a schematic diagram of the structure of granular sludge in the short-range denitrification of the present invention;

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

[0049] Figure 7 It is a water quality diagram of nitrite nitrogen concentration after the short-range denitrification granular sludge reactor of the present invention is successfully started;

[0050] Figure 8 It is a water quality diagram of the nitrate nitrogen removal rate after the short-range denitrification granular sludge reactor of the present invention is successfully started;

[0051] Fig. 9 It is a water quality diagram of the nitrate nitrogen conversion rate after the short-range denitrification granular sludge reactor of the present invention is successfully started;

[0052] Fig.10 It is a water quality diagram during the stable operation stage of the present invention.

[0053] In the figure, 1-nitrate nitrogen wastewater tank, 2-carbon source water tank, 3-short-range denitrification granular sludge reactor, 4-ammonia nitrogen wastewater tank, 5-anaerobic ammonia oxidation granular sludge reactor, 6-water outlet tank, 31-first water inlet pump, 32-second water inlet pump, 33-first water inlet, 34-first water outlet, 35-low-speed agitator, 36-first three-phase separator, 37-first exhaust port, 38-first constant temperature water tank, 380-first insulation ring shell, 39-first insulation water inlet, 310- First insulation water outlet, 311-first thermometer, 50-anaerobic ammonia oxidation tank, 51-third water inlet pump, 52-second water inlet, 53-second water outlet, 54-second three-phase separator, 55-second exhaust port, 56-reflux liquid outlet, 57-reflux pump, 58-reflux liquid inlet, 59-second constant temperature water tank, 590-second insulation ring shell, 510-second insulation water inlet, 511-second insulation water outlet, 512-second thermometer, 70-hypoxia control machine Structure, 71-hypoxia control support seat, 72-hypoxia control receiving tube, 721-hypoxia control input pipe, 7210-hypoxia input control valve, 722-hypoxia control output pipe, 7220-hypoxia 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 seat, 74-negative pressure drive crankshaft, 741-exhaust drive connecting rod, 742-crankshaft driven gear, 743-crankshaft drive motor, 744-crankshaft drive gear, 80-outlet sludge barrier structure, 81-sludge barrier containing tube, 82-sludge barrier column, 820-outlet flow hole, 830-sludge cleaning tube, 831-cleaning drive fixed cylinder, 832-cleaning drive sliding cylinder, 833-cleaning support ring, 834-cleaning support turntable, 835-cleaning drive rod. DETAILED DESCRIPTION

[0054] Combine the following Figures 1 to 10The present invention is described in detail. For the convenience of description, the directions mentioned below are defined as follows: the up, down, left, right, front, and back directions mentioned below are consistent with the up, down, left, right, front, and back directions of the projection relationship of the respective main views or structural schematic diagrams themselves.

[0055] Example 1: Two-stage short-range denitrification-anaerobic ammonium oxidation dual granular sludge device for sewage 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 to 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-distance denitrification granular sludge reactor 3 includes a short-distance denitrification tank 30, and the lower end of the short-distance denitrification tank 30 has a first water inlet 33, the nitrate nitrogen wastewater tank 1 is connected to the first water inlet 33 through a first water inlet pump 31, and the carbon source water tank 2 is connected to the first water inlet 33 through a second water inlet pump 32;

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

[0058] The outer side of the short-range denitrification tank 30 is provided with a first water outlet 34 near the upper end;

[0059] A first three-phase separator 36 is fixed to the upper end of the short-range denitrification tank 30, and a first exhaust port 37 is provided on the first three-phase separator 36;

[0060] A low-speed stirrer 35 is provided on the top of the short-range denitrification tank 30, and a stirring shaft of the low-speed stirrer 35 vertically extends into the interior of the short-range denitrification tank 30;

[0061] The anaerobic ammonium oxidation granular sludge reactor 5 includes an anaerobic ammonium oxidation tank body 50, and a second water inlet 52 is provided at the bottom of the anaerobic ammonium oxidation tank body 50. The second water inlet 52 is connected to an ammonia nitrogen sewage tank 4, and the ammonia nitrogen sewage tank 4 is connected to the second water inlet 52 through a third water inlet pump 51;

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

[0063] The interior of the anaerobic ammonium oxidation granular sludge reactor 5 is inoculated with mature anaerobic ammonium oxidation granular sludge;

[0064] The outer side of the anaerobic ammonium oxidation tank body 50 is provided with a second water outlet 53 near the upper end, and the second water outlet 53 is connected to a water outlet box 6 through a pipeline;

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

[0066] A first heat-insulating ring shell 380 is fixedly surrounded on the outer side of the short-range denitrification tank body 30, and a first heat-insulating water inlet 39 and a first heat-insulating water outlet 310 are provided on 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 a pipeline;

[0067] A first thermometer 311 is disposed on the side wall of the first heat-insulating ring shell 380 .

[0068] A reflux liquid outlet 56 is provided on the outer side of the anaerobic ammonium oxidation tank body 50 near the upper end, and a reflux liquid inlet 58 is provided at the bottom of the anaerobic ammonium oxidation tank body 50 . The reflux liquid outlet 56 is connected to the reflux liquid inlet 58 through a reflux pump 57 .

[0069] The anaerobic ammonia oxidation tank body 50 is surrounded and fixed with a second heat-insulating ring shell 590, and the second heat-insulating ring shell 590 has a second heat-insulating water inlet 510 and a second heat-insulating water outlet 511, and 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 a pipeline;

[0070] A second thermometer 512 is disposed on the side wall of the second heat-insulating ring shell 590 .

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

[0072] A negative pressure pumping cylinder 73 with an opening facing upward is fixed on the top of the hypoxia control housing cylinder 72, and a negative pressure pumping piston 731 is slidably connected inside the negative pressure pumping cylinder 73;

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

[0074] One end of the air extraction driving connecting rod 741 is rotatably connected to the negative pressure driving crankshaft 74, and the other end of the air extraction driving connecting rod 741 is connected to the negative pressure air extraction piston 731 in the form of a fixed hinge, and the rotating shaft of the fixed hinge is parallel to the rotating axis of the negative pressure driving crankshaft 74;

[0075] like Figure 3 As shown, the outer side of the hypoxia control accommodating tube 72 near the lower end is provided with a hypoxia control input pipe 721, and the hypoxia control input pipe 721 is provided with a hypoxia input control valve 7210, and the outer side of the hypoxia control accommodating tube 72 near the upper end is provided with a hypoxia control output pipe 722, and the hypoxia control output pipe 722 is provided with a hypoxia output control valve 7220;

[0076] The bottom of the negative pressure vacuum cylinder 73 is connected to the interior of the hypoxia control container 72 through a vacuum connecting pipe 732, and a vacuum control valve 7320 is fixed in the vacuum connecting pipe 732;

[0077] A negative pressure exhaust pipe 733 is provided near the lower end of the negative pressure exhaust cylinder 73, and a negative pressure exhaust control valve 7330 is provided on the negative pressure exhaust pipe 733;

[0078] An overflow pipe 734 is provided on the outer side of the negative pressure exhaust cylinder 73 near the lower end, and an overflow check valve 7340 is provided on the overflow pipe 734;

[0079] 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 .

[0080] like Figure 2 As shown, a crankshaft driven gear 742 is fixed to one end of the negative pressure driving crankshaft 74, a crankshaft driving motor 743 is fixed to the hypoxia control support seat 71, a crankshaft driving gear 744 is fixed to the output shaft of the crankshaft driving motor 743, and the crankshaft driving gear 744 is meshed and connected with the crankshaft driven gear 742.

[0081] Embodiment 3: Based on embodiment 2, Figure 1 As shown, the anaerobic ammonium oxidation tank 50 is provided with an effluent sludge barrier structure 80, as shown in FIG. Figure 4 As shown, the effluent sludge barrier structure 80 includes a sludge barrier containing pipe 81 fixed in the anaerobic ammonium oxidation tank body 50 and vertically penetrated, a sludge barrier column 82 is fixed in the sludge barrier containing pipe 81, and the sludge barrier column 82 has a plurality of effluent flow holes 820 spirally extending around the axis of the sludge barrier containing pipe 81;

[0082] A plurality of cleaning drive fixed cylinders 831 arranged parallel to the axis of the sludge barrier accommodating tube 81 are fixed on the inner wall thereof, 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 coaxially arranged with the sludge barrier accommodating tube 81 is fixed on the outer end of the cleaning drive sliding cylinder 832, a cleaning support turntable 834 is rotatably connected inside the cleaning support ring 833, a plurality of sludge cleaning tubes 830 spirally extending around the axis of the sludge barrier accommodating tube 81 are fixed on the cleaning support turntable 834, and the plurality of sludge cleaning tubes 830 are slidably connected in each water outlet flow hole 820 in a one-to-one corresponding manner;

[0083] A cleaning drive rod 835 is provided in the cleaning drive fixed cylinder 831 for driving the cleaning drive sliding cylinder 832 to move. The cleaning drive rod 835 is an electrically controlled telescopic rod according to the prior art. The outer rod end of the cleaning drive rod 835 is fixedly connected to the top of the cleaning drive fixed cylinder 831, and the inner rod 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 water inlet pump 31 and the second water 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 receiving tube 72. The anoxic control output pipe 722 is connected to the first water inlet 33, so as to transport the sewage in the anoxic control receiving tube 72 to the inside of the short-range denitrification tank 30 through the first water 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 pumping piston 731 through the crank-connecting rod structure. The rotation of the negative pressure drive crankshaft 74 drives the negative pressure pumping piston 731 to reciprocate along the axis of the negative pressure pumping cylinder 73 through the pumping drive connecting rod 741.

[0087] Attach Figure 3 For example, the negative pressure pumping piston 731 moves from bottom to top as the pumping stroke, and the negative pressure pumping piston 731 moves from top to bottom as the exhaust stroke;

[0088] Sewage is input from the hypoxia control input pipe 721, and when the hypoxia control receiving tube 72 is filled, the sewage is discharged from the hypoxia control output pipe 722;

[0089] In the air pumping stroke, when the negative pressure air pumping piston 731 is at the lowest point;

[0090] Valve status 1:

[0091] Hypoxia input control valve 7210: closed;

[0092] Hypoxia output control valve 7220: closed;

[0093] Air extraction control valve 7320: open;

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

[0095] During the air extraction stroke, the negative pressure air extraction piston 731 moves from bottom to top, the volume of the negative pressure air extraction cylinder 73 expands, and under the action of negative pressure, the gas dissolved in the sewage forms microbubbles and escapes from the sewage, and enters the negative pressure air extraction cylinder 73 through the air extraction control valve 7320;

[0096] When the negative pressure suction piston 731 is at the highest point, it then enters the exhaust stroke;

[0097] Valve status 2:

[0098] Hypoxia input control valve 7210: open;

[0099] Hypoxia 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 interior of the negative pressure suction cylinder 73 is compressed, and the gas escaping from the sewage is discharged through the negative pressure exhaust pipe 733;

[0103] At the same time, sewage continues to be input from the hypoxia control input pipe 721, and the single input amount is 70% of the volume of the hypoxia control receiving tube 72, replacing the sewage that has just been negatively pressure treated, and the sewage that has been negatively pressure treated is discharged from the hypoxia control output pipe 722, and the newly input sewage continues to be negatively pressure treated in the next air extraction stroke;

[0104] When the exhaust stroke is completed, the negative pressure suction piston 731 falls back to the lowest point;

[0105] Valve status 1:

[0106] Hypoxia input control valve 7210: closed;

[0107] Hypoxia output control valve 7220: closed;

[0108] Air extraction control valve 7320: open;

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

[0110] Re-enter the exhaust stroke;

[0111] The vacuum stroke and exhaust stroke are performed repeatedly in this way, and each valve also executes valve state 1 and valve state 2 accordingly, continuously performing negative pressure treatment on the sewage to eliminate dissolved oxygen in the sewage as much as possible;

[0112] When the sewage flows from bottom to top in the anaerobic ammonium oxidation tank 50 and passes through the effluent sludge barrier structure 80, the sewage passes through each effluent flow hole 820 and the sludge cleaning pipe 830 from bottom to top;

[0113] The sludge carried in the sewage will be retained in each outlet flow hole 820, minimizing the loss of sludge;

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

[0115] The sludge trapped and attached to each water outlet flow hole 820 is cleaned and dropped by using the sludge cleaning pipe 830, so that the dropped sludge returns to the bottom of the anaerobic ammonium oxidation tank body 50 under the action of its own weight;

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

[0117] Test example: In order to verify the effect of the two-stage short-range denitrification-anaerobic ammonia oxidation dual-granular sludge device for sewage treatment of the present application, the flocculent sludge collected from the anoxic tank of an actual sewage treatment plant is taken as an example and treated with the device of the present application.

[0118] The test method is as follows:

[0119] (1) Phase I:

[0120] Short-cut denitrification granular sludge reactor 3: flocculent sludge from the anoxic tank was collected from an actual sewage plant. After settling for 2 hours, the supernatant was discarded to obtain concentrated sludge with a sludge concentration of about 10.35 g / L. 1.0 L of 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 the nitrate nitrogen wastewater tank 1 was about 50 mg / L, and the nitrate nitrogen inlet flow rate gradually increased according to 250, 500, 1000, and 2000 mL / h, and the corresponding HRT was 8, 4, 2, and 1 h, respectively; the inlet flow rate of the carbon source water tank 2 gradually increased according to one tenth of the nitrate nitrogen inlet flow rate, that is, 25, 50, 100, and 200 mL / h. COD was provided by sodium acetate, and COD The concentration is about 500 mg / L, and the COD / NO3--N is 1.0; the first water inlet 33 is a three-way valve, the nitrate nitrogen inlet is transported by the first water inlet pump 31, and the carbon source inlet is transported by the second water inlet pump 32. After the nitrate nitrogen inlet and the carbon source inlet are combined at the three-way valve, they enter the short-range denitrification tank 30 from the first water inlet 33 together, and the nitrate nitrogen inlet and the carbon source inlet flow from bottom to top through the sludge layer in the short-range denitrification tank 30. At the first three-phase separator 36, the sludge, water, and gas are efficiently separated, and 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-range denitrification tank 30, and is discharged through the first water outlet 34;

[0121] In the startup phase, when sludge floats in the short-range denitrification tank 30, the low-speed agitator 35 is turned on, and the floating sludge large aggregates are dispersed under the action of hydraulic shear, and the sludge settles to the bottom area of ​​the short-range denitrification tank 30 after the bubbles are released. The low-speed agitator 35 is turned off when there is no more sludge floating.

[0122] When the volume proportion of sludge with particle size greater than 0.5 mm reaches more than 70%, it indicates that the granular sludge is successfully formed. Fig. 9 As shown; when the conversion rate of nitrate nitrogen to nitrite nitrogen is maintained at about 60%, and the ratio of nitrogen loss, i.e., the amount of nitrogen gas converted to the total amount of nitrate nitrogen in the influent is maintained at about 11%, it indicates that the short-range denitrification functional bacteria are in a dominant position, and the short-range denitrification granular sludge is successfully formed. At this time, COD / NO3--N is gradually increased; the COD concentration is gradually increased according to 750, 1000, and 1100, and the corresponding COD / NO3--N is 1.5, 2.0, and 2.2, and the low-speed agitator 35 is kept on, and the speed is set to 10rpm;

[0123] The continuous experimental results show that the nitrite nitrogen concentration of the effluent from the short-cut denitrification granular sludge reactor 3 is 30.6±1.6 mg / L, the removal rate of nitrate nitrogen 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 is successfully started. 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] The anaerobic ammonium oxidation granular sludge reactor 5 is started: mature anaerobic ammonium oxidation granular sludge is inoculated in the anaerobic ammonium oxidation granular sludge reactor 5, and the concentration of the inoculated sludge is about 22.8g / L; the ammonia nitrogen concentration in the ammonia nitrogen sewage tank 4 is about 50mg / L, and the inlet flow rate is calculated as 1000mL / h according to the formula Q=(2200*c) / (1.32*50), where c is the nitrite nitrogen concentration (mg / L) in the effluent of the short-range denitrification granular sludge reactor; the second water inlet 52 is a three-way valve, and the ammonia nitrogen inlet is transported by the third water inlet pump 51, and the ammonia nitrogen inlet is connected to the first The water from the water outlet 34 is combined with the three-way valve of the second water inlet 52 and enters the interior of the anaerobic ammonium oxidation tank body 50 from the second water inlet 52. The ammonia nitrogen inlet and the water from the first water outlet 34 flow through the sludge layer from bottom to top in the anaerobic ammonium oxidation tank body 50. At the second three-phase separator 54, the 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 ammonium oxidation tank body 50 and is discharged through the second water outlet 53. The water discharged from the second water outlet 53 enters the water outlet tank 6.

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

[0127] (3) The third stage:

[0128] The system operates stably: the effective volume of the short-cut denitrification granular sludge reactor 3 is consistent with that of the anaerobic ammonium oxidation granular sludge reactor 5; the nitrate nitrogen influent concentration is about 50 mg / L, and the flow rate is 2000 mL / h; the carbon source influent COD concentration is about 500 mg / L, 200 mL / h; the ammonia nitrogen concentration is about 50 mg / L, and the 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 of the short-cut denitrification granular sludge reactor, and COD / NO3--N is 2.2; the speed of the low-speed agitator 35 is 10 rpm; the reflux ratio from the reflux liquid outlet 56 to the reflux liquid inlet 58 in the anaerobic ammonium oxidation granular sludge reactor 5 is 100%, that is, 3200 mL / h;

[0129] The results of continuous experiments show that after stable operation, the system effluent ammonia nitrogen concentration was lower than 1.0 mg / L, nitrate nitrogen concentration was lower than 5.0 mg / L, and total nitrogen was lower than 10.0 mg / L for 14 consecutive days. The ammonia nitrogen removal rate reached 96.3%-99.2%, the nitrate nitrogen removal rate reached 83.9%-98.8%, and the total nitrogen removal rate reached 82.3%-93.9%, which met the Level A standard in the "Pollutant Discharge Standard for Urban Wastewater Treatment Plants" GB18918-2002.

[0130] Through the above experimental analysis, it can be seen that the sludge device of the present invention adopts the strategy of shortening HRT under extremely low carbon-nitrogen ratio to cultivate short-term denitrification granular sludge during the startup stage of the short-term denitrification granular sludge reactor, which greatly saves the carbon source required in the startup stage; the COD / NO3--N in the operation stage is 2.2, which can meet the requirements of deep denitrification. Compared with the prior art, it can save 12-58% of the carbon source and has lower carbon emissions; the low-speed agitator of the short-term denitrification granular sludge reactor has a rotation speed of only 10rpm, which has the advantage of low energy consumption.

Claims

1. A two-stage short-range denitrification-anaerobic ammonium oxidation dual granular sludge device for sewage treatment, characterized in that: It comprises a nitrate nitrogen wastewater tank (1) and a carbon source water tank (2) arranged in parallel, a short-range denitrification granular sludge reactor (3) connected to the nitrate nitrogen wastewater tank (1) and the carbon source water tank (2), and an anaerobic ammonium oxidation granular sludge reactor (5) connected in series with the short-range denitrification granular sludge reactor (3); The short-cut denitrification granular sludge reactor (3) comprises a short-cut denitrification tank (30), the lower end of the short-cut denitrification tank (30) is provided with a first water inlet (33), the nitrate nitrogen wastewater tank (1) is connected to the first water inlet (33) via a first water inlet pump (31), and the carbon source water tank (2) is connected to the first water inlet (33) via a second water inlet pump (32); The short-range denitrification tank (30) has a first water outlet (34) on the outside near the upper end; A first three-phase separator (36) is fixed at the upper end of the short-range denitrification tank (30), and a first exhaust port (37) is provided on the first three-phase separator (36); A low-speed stirrer (35) is provided on the top of the short-range denitrification tank (30), and a stirring shaft of the low-speed stirrer (35) vertically extends into the interior of the short-range denitrification tank (30); The anaerobic ammonium oxidation granular sludge reactor (5) comprises an anaerobic ammonium oxidation tank body (50), the bottom of the anaerobic ammonium oxidation tank body (50) is provided with a second water inlet (52), the second water inlet (52) is connected to an ammonia nitrogen sewage tank (4), and the ammonia nitrogen sewage tank (4) is connected to the second water inlet (52) via a third water inlet pump (51); The first water outlet (34) is connected to the second water inlet (52) through a pipeline; The outer side of the anaerobic ammonium oxidation tank body (50) is provided with a second water outlet (53) near the upper end, and the second water outlet (53) is connected to a water outlet box (6) via a pipeline; A second three-phase separator (54) is fixed at the upper end of the anaerobic ammonium oxidation tank (50), and the second three-phase separator (54) is provided with a second exhaust port (55).

2. The two-stage short-range denitrification-anaerobic ammonium oxidation dual-granular sludge device for sewage treatment according to claim 1 is characterized in that: The first heat-insulating ring shell (380) is fixedly surrounded on the outside of the short-range denitrification tank (30), and the first heat-insulating ring shell (380) is provided with a first heat-insulating water inlet (39) and a first heat-insulating water outlet (310), and 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 a pipeline; A first thermometer (311) is provided on the side wall of the first heat-insulating ring shell (380).

3. The two-stage short-range denitrification-anaerobic ammonium oxidation dual-granular sludge device for sewage treatment according to claim 1 is characterized in that: The outer side of the anaerobic ammonium oxidation tank body (50) is provided with a reflux liquid outlet (56) near the upper end, and the bottom of the anaerobic ammonium oxidation tank body (50) is provided with a reflux liquid inlet (58), and the reflux liquid outlet (56) is connected to the reflux liquid inlet (58) via a reflux pump (57).

4. The two-stage short-range denitrification-anaerobic ammonium oxidation dual-granular sludge device for sewage treatment according to claim 1 is characterized in that: A second heat-insulating ring shell (590) is fixedly surrounded on the outside of the anaerobic ammonia oxidation tank body (50), and the second heat-insulating ring shell (590) is provided with a second heat-insulating water inlet (510) and a second heat-insulating water outlet (511), and the second heat-insulating water inlet (510) and the second heat-insulating water outlet (511) are connected to a second constant-temperature water tank (59) through a pipeline; A second thermometer (512) is provided on the side wall of the second thermal insulation ring shell (590).

5. The two-stage short-range denitrification-anaerobic ammonium oxidation dual-granular sludge device for sewage treatment according to claim 1, characterized in that: An oxygen deficiency control mechanism (70) is provided between the first water inlet pump (31), the second water inlet pump (32) and the first water inlet (33), and the oxygen deficiency control mechanism (70) comprises an oxygen deficiency control support seat (71), and a plurality of vertically extending oxygen deficiency control containing cylinders (72) are fixed on the top of the oxygen deficiency control support seat (71); A negative pressure pumping cylinder (73) with an opening facing upward is fixed on the top of the hypoxia control containing cylinder (72), and a negative pressure pumping piston (731) is slidably connected inside the negative pressure pumping cylinder (73); A crankshaft support seat (740) is fixed on the top of the hypoxia control support seat (71), and a horizontally arranged negative pressure driving crankshaft (74) is rotatably connected to the crankshaft support seat (740), and the negative pressure driving crankshaft (74) is connected to the negative pressure suction piston (731) via a suction driving connecting rod (741); The outer side of the hypoxia control containing tube (72) is provided with a hypoxia control input pipe (721) near the lower end, and the hypoxia control input pipe (721) is provided with a hypoxia input control valve (7210); the outer side of the hypoxia control containing tube (72) is provided with a hypoxia control output pipe (722) near the upper end, and the hypoxia control output pipe (722) is provided with a hypoxia output control valve (7220); The bottom of the negative pressure vacuum cylinder (73) is connected to the interior of the hypoxia control accommodating cylinder (72) via a vacuum connecting pipe (732), and a vacuum control valve (7320) is fixed in the vacuum connecting pipe (732); A negative pressure exhaust pipe (733) is provided on the outside of the negative pressure exhaust cylinder (73) near the lower end, and a negative pressure exhaust control valve (7330) is provided on the negative pressure exhaust pipe (733); An overflow pipe (734) is provided on the outside of the negative pressure exhaust cylinder (73) near the lower end, and an overflow check valve (7340) is provided on the overflow pipe (734); 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).

6. The two-stage short-range denitrification-anaerobic ammonium oxidation dual-granular sludge device for sewage treatment according to claim 5, characterized in that: A crankshaft driven gear (742) is fixed to one end of the negative pressure driving crankshaft (74), a crankshaft driving motor (743) is fixed to the hypoxia control support seat (71), a crankshaft driving gear (744) is fixed to the output shaft of the crankshaft driving motor (743), and the crankshaft driving gear (744) is meshedly connected with the crankshaft driven gear (742).

7. The two-stage short-range denitrification-anaerobic ammonium oxidation dual granular sludge device for sewage treatment according to claim 1, characterized in that: An effluent sludge barrier structure (80) is provided in the anaerobic ammonium oxidation tank body (50), and the effluent sludge barrier structure (80) comprises a sludge barrier containing pipe (81) fixed in the anaerobic ammonium oxidation tank body (50) and vertically passing through, a sludge barrier column (82) is fixed in the sludge barrier containing pipe (81), and the sludge barrier column (82) has a plurality of effluent flow holes (820) spirally extending around the axis of the sludge barrier containing pipe (81); A plurality of cleaning drive fixed cylinders (831) arranged parallel to the axis of the sludge barrier and containing tube (81) are fixed on the inner side wall thereof, a cleaning drive sliding cylinder (832) is slidably connected inside the cleaning drive fixed cylinder (831), a cleaning support ring (833) coaxially arranged with the sludge barrier and containing tube (81) is fixed to the outer end of the cleaning drive sliding cylinder (832), a cleaning support rotating disk (834) rotatably connected inside the cleaning support ring (833), a plurality of sludge cleaning tubes (830) spirally extending around the axis of the sludge barrier and containing tube (81) are fixed on the cleaning support rotating disk (834), and the plurality of sludge cleaning tubes (830) are slidably connected in each water outlet flow hole (820) in a one-to-one corresponding manner; A cleaning drive rod (835) for driving the cleaning drive sliding cylinder (832) to move is arranged in the cleaning drive fixed cylinder (831).

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