A short-cut nitrification and denitrification reactor and a method for operating the same

Abstract

The application discloses a short-range nitrification and denitrification reactor and a running method thereof. The reactor comprises, in sequence, a water inlet tank, a short-range nitrification and denitrification reaction tower, a sedimentation tank, an intermediate water tank, a cell immobilization anaerobic ammonia oxidation reactor and a water outlet tank. The running method of the reactor comprises the following steps: S1, sludge inoculation; S2, nitrification and denitrification treatment: S2-1, pretreatment; S2-2, continuous treatment; S2-3, post-treatment; and S3, cell immobilization anaerobic ammonia oxidation treatment. The application combines the short-range nitrification and denitrification technology and the cell immobilization anaerobic ammonia oxidation technology and applies the combination to the treatment of high-ammonia-nitrogen wastewater. Compared with the traditional nitrification and denitrification method, the oxygen supply amount is saved by 40-60%, the COD demand amount is reduced by 100%, the sludge yield is reduced by 60-90% through recycling and reusing of the sludge in the sedimentation tank, and the NO2 ‑ ‑N / NH4 + ‑N ratio is stable and convenient to control compared with the general short-range nitrification and denitrification-anaerobic ammonia oxidation technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ammonia nitrogen wastewater treatment, in particular to a short-cut nitrification and denitrification reactor and a running method thereof. BACKGROUND

[0002] In recent years, with the continuous exploration and in-depth research of scholars at home and abroad on denitrifying microorganisms and nitrification / denitrification mechanisms, some new and efficient biological denitrification technologies have been gradually developed, such as short-cut nitrification and denitrification process, anaerobic ammonia oxidation process (ANAMMOX), limited autotrophic nitrification and denitrification process, complete autotrophic biological denitrification technology, and partial denitrification-ANAMMOX, etc. The emergence and development of these new biological denitrification technologies have opened up new ways to solve the problem of nitrogen removal in high-ammonia-nitrogen wastewater such as biogas slurry from pig farms. By introducing new biological denitrification technologies, the current wastewater treatment practice can be significantly improved.

[0003] Among these new denitrification processes, the strategy of combining short-cut nitrification and denitrification process with ANAMMOX process has a high nitrogen removal rate in treating high-ammonia-nitrogen wastewater such as biogas slurry from pig farms, sludge digestion liquid, and landfill leachate, and can significantly reduce the operating cost of wastewater treatment, thus having very obvious cost-effectiveness and energy efficiency, and being considered as the most promising denitrification technology.

[0004] However, both of them often face challenges such as difficulty in stable control of the ratio of NO2 - -N / NH4 + ratio, adaptation of NOB to inhibition, long growth cycle of AnAOB, slow enrichment, and extreme sensitivity to environmental factors such as heavy metals and antibiotics, especially the control of sludge amount and reuse in short-cut nitrification and denitrification. SUMMARY

[0005] In view of the above problems, the present application provides a short-cut nitrification and denitrification reactor and a running method thereof.

[0006] The technical scheme of the present application is as follows:

[0007] A short-cut nitrification and denitrification reactor, comprising a water inlet tank, a short-cut nitrification and denitrification reaction tower, a sedimentation tank, an intermediate water tank, a cell immobilization anaerobic ammonia oxidation reactor, and a water outlet tank connected in sequence.

[0008] The short-range nitrification and denitrification reaction tower bottom side is connected with the water inlet tank through a water inlet pipe, and the short-range nitrification and denitrification reaction tower top side is connected with the top side of the sedimentation tank through a first drainage pipe, and a booster pump is arranged in the middle of the first drainage pipe, and three mutually parallel and inclined sedimentation flow distribution plates are arranged in the sedimentation tank, which are a telescopic first sedimentation flow distribution plate, a second sedimentation flow distribution plate and a third sedimentation flow distribution plate from top to bottom, the first sedimentation flow distribution plate is above the bottom end of the first drainage pipe, and the third sedimentation flow distribution plate is located at the bottom of the sedimentation tank, and the bottom side of the sedimentation tank is connected with the bottom of the short-range nitrification and denitrification reaction tower through three equally spaced first reflux pipes;

[0009] Among the three first reflux pipes, the inlet end of the lowermost first reflux pipe corresponds to between the second sedimentation flow distribution plate and the third sedimentation flow distribution plate, the inlet end of the middle first reflux pipe corresponds to between the second sedimentation flow distribution plate and the first sedimentation flow distribution plate, and the inlet end of the uppermost first reflux pipe corresponds to above the first sedimentation flow distribution plate;

[0010] The top side of the cell immobilized anaerobic ammonia oxidation reactor is communicated with the bottom of the cell immobilized anaerobic ammonia oxidation reactor through a second reflux pipe.

[0011] Further, the top side of the sedimentation tank is connected with the intermediate tank through a first flow guide pipe, the bottom side of the intermediate tank is connected with the bottom of the cell immobilized anaerobic ammonia oxidation reactor through a second flow guide pipe, the top side of the cell immobilized anaerobic ammonia oxidation reactor is connected with the water outlet tank through a third flow guide pipe, a stirring rod is arranged in the middle of the short-range nitrification and denitrification reaction tower, the stirring rod is driven to rotate by a stirring motor located at the top of the short-range nitrification and denitrification reaction tower, an aeration device is arranged at the middle side of the short-range nitrification and denitrification reaction tower, and a monitoring device is arranged at the upper part of the short-range nitrification and denitrification reaction tower.

[0012] Description: The setting of the stirring rod promotes the nitrification and denitrification, and the monitoring device can monitor the pH and dissolved oxygen parameters in the short-range nitrification and denitrification reaction tower in real time.

[0013] Still further, flow guide pumps are arranged on the water inlet pipe, the first reflux pipe, the second reflux pipe, the first flow guide pipe, the second flow guide pipe and the third flow guide pipe.

[0014] Description: The flow guide pumps realize the transportation of wastewater.

[0015] Further, the first sedimentation flow distribution plate comprises an outer sliding plate and an inner sliding plate which are slidably sleeved, the bottom of the outer sliding plate is fixedly connected with the side wall of the sedimentation tank, a traction rope is arranged at the middle of the upper end of the inner sliding plate, the traction rope is fixedly connected with a limiting block located at the bottom of the outer sliding plate after passing around a fixed shaft arranged on the inner wall of the sedimentation tank.

[0016] Description: The setting of the traction rope and the limiting block can assist the inner sliding plate in limiting.

[0017] Further, the outer wall of the sedimentation tank is provided with a driving motor, the output end of the driving motor is provided with a telescopic rod, the end of the telescopic rod penetrates through the sedimentation tank and is provided with a mud scraping plate, the mud scraping plate is arranged in an inverted T shape, the running track of the bottom of the mud scraping plate is flush with the upper surface of the second sedimentation baffle, the fixed shaft is located above the initial position of the mud scraping plate, and the top of the mud scraping plate is in butt joint with the limiting block when sliding.

[0018] Description: By linking the mud scraping plate and the limiting block, the inner sliding plate can be extended when the mud is scraped and discharged, so that the pretreatment is facilitated, the sludge is supplemented, and the overall operation efficiency of the device is improved.

[0019] Further, the limiting block is slidably connected with the sliding groove arranged at the bottom of the outer sliding plate, a sliding block is arranged at each side of the top of the limiting block, and the sliding block is slidably connected with the limiting groove arranged at the top of the sliding groove.

[0020] Description: The sliding block and the limiting groove are arranged to keep the stability of the limiting block when sliding.

[0021] Further, the inlet end of the first reflux pipe located at the lowermost position is provided with a mud suction pipe group, the mud suction pipe group comprises a main pipe and a plurality of branch pipes, each branch pipe is symmetrically arranged at the two sides of the main pipe, and the bottom of the main pipe and the branch pipes is provided with an opening.

[0022] Description: The mud suction pipe group can be used for refluxing wastewater and sludge during continuous treatment.

[0023] The application also provides a running method of the short-cut nitrification and denitrification reactor.

[0024] S1, sludge inoculation: inoculating aerobic sludge from a sewage plant into the short-cut nitrification and denitrification reactor tower, so that the concentration of the aerobic sludge in the short-cut nitrification and denitrification reactor tower is maintained at 3000-6000 mg / L;

[0025] S2, nitrification and denitrification treatment:

[0026] S2-1, pretreatment: pumping the ammonia-nitrogen-containing wastewater in the water inlet tank into the bottom of the short-cut nitrification and denitrification reactor tower through the water inlet pipe, performing nitrification and denitrification reaction during the upward movement of the ammonia-nitrogen-containing wastewater, and discharging the wastewater into the sedimentation tank through the first drainage pipe when the wastewater reaches the top of the short-cut nitrification and denitrification reactor tower, at this time, the first sedimentation baffle is elongated, so that the ammonia-nitrogen-containing wastewater is refluxed into the short-cut nitrification and denitrification reactor tower through the first reflux pipe located at the uppermost position, and the nitrite accumulation rate in the short-cut nitrification and denitrification reactor tower is greater than 95%.

[0027] S2-2, continuous treatment: shrink the first sedimentation baffle, and make the pretreated ammonia-nitrogen-containing wastewater enter the sedimentation tank, and then sequentially deposit through the first sedimentation baffle, the second sedimentation baffle and the third sedimentation baffle, and then pump the deposited wastewater into the intermediate water tank through the first flow guide pipe, and then pump the wastewater into the cell immobilized anaerobic ammonia oxidation reactor through the second flow guide pipe, and at the same time, a part of the wastewater is returned through the first reflux pipe located at the lowermost and the uppermost;

[0028] S2-3, post-treatment: when the ammonia-nitrogen-containing wastewater is treated, before the next treatment, the sludge deposit on the surface of the second sedimentation baffle is scraped off through the mud scraper and is injected into the short-cut nitrification and denitrification reaction tower through the first reflux pipe located in the middle, and at the same time, the mud scraper extends the first sedimentation baffle, so that the sludge deposit on the surface of the first sedimentation baffle during the pretreatment is flushed and carried through the booster pump, and is injected into the short-cut nitrification and denitrification reaction tower through the first reflux pipe located at the uppermost;

[0029] S3, cell immobilized anaerobic ammonia oxidation treatment: the anaerobic ammonia oxidation granular sludge is dispersed into flocculent biomass and is fixed in the cell immobilized anaerobic ammonia oxidation reactor, the wastewater treated in S2-2 is pumped into the cell immobilized anaerobic ammonia oxidation reactor, the concentration of the anaerobic ammonia oxidation granular sludge in the cell immobilized anaerobic ammonia oxidation reactor is controlled to be 6000-20000 mg / L, the hydraulic retention time is 6-24 h, and part of the wastewater is returned through the second reflux pipe, so as to ensure that the upward flow velocity in the cell immobilized anaerobic ammonia oxidation reactor is 3-5 m / h.

[0030] Further, the return amount of the first reflux pipe located at the uppermost in S2-2 is 5-8% of the total wastewater flow, and the return amount of the first reflux pipe located at the lowermost is 10-15% of the total wastewater flow.

[0031] Description: by optimizing and adjusting the proportion of the return amount to the total wastewater flow, the continuous operation of the reactor and the automatic sludge replenishment are realized.

[0032] The application further provides an application of the short-cut nitrification and denitrification reactor, and the short-cut nitrification and denitrification reactor is applied to the denitrification treatment of biogas slurry of a pig farm.

[0033] The application has the following beneficial effects:

[0034] (1) The short-cut nitrification and denitrification reactor of the application combines the short-cut nitrification and denitrification technology and the cell immobilized anaerobic ammonia oxidation technology, and is applied to the treatment of high-ammonia-nitrogen wastewater, and compared with the traditional nitrification and denitrification method, the oxygen supply amount is saved by 40-60%, the COD demand amount is reduced by 100%, the sludge yield is reduced by 60-90% through the recycling of the sludge in the sedimentation tank, and compared with the general short-cut nitrification and denitrification-anaerobic ammonia oxidation technology, the NO2- -N / NH4 + The N / NH4 ratio is stable and convenient to control.

[0035] (2) The short-range nitrification denitrification reactor of the present application can realize layered sedimentation by modifying the sedimentation tank, can quickly return sewage, and has certain mutual effect between layers. The corresponding returned sewage or sludge is selected according to the return height, the sludge reuse rate is improved, the use is convenient, and the use is conducive to popularization and use.

[0036] (3) The operation method of the short-range nitrification denitrification reactor of the present application specifically limits the wastewater reuse amount and sludge sedimentation reuse treatment mode, so that the function of the device of the present application can be maximized, thereby improving the overall treatment efficiency of the ammonia-nitrogen-containing wastewater. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a front overall structure schematic diagram of the short-range nitrification denitrification reactor of the present application;

[0038] Figure 2 is a side overall structure schematic diagram of the short-range nitrification denitrification reactor of the present application;

[0039] Figure 3 is a top view of the short-range nitrification denitrification reactor of the present application;

[0040] Figure 4 is a front view and internal structure schematic diagram of the short-range nitrification denitrification reactor of the present application;

[0041] Figure 5 is an internal structure schematic diagram of the sedimentation tank in the short-range nitrification denitrification reactor of the present application;

[0042] Figure 6 is a schematic diagram of the bottom structure of each flow divider plate in the sedimentation tank in the short-range nitrification denitrification reactor of the present application;

[0043] Figure 7 is a front view of the sedimentation tank in the short-range nitrification denitrification reactor of the present application;

[0044] Figure 8 is a front view when mud scraping is performed in the short-range nitrification denitrification reactor of the present application;

[0045] Figure 9 is a sectional view of the connection between the limiting block and the chute in the short-range nitrification denitrification reactor of the present application.

[0046] Wherein, 1 - water tank, 11 - water inlet pipe, 2 - short-range nitrification and denitrification reactor, 21 - first drain pipe, 22 - booster pump, 23 - first return pipe, 24 - stirring rod, 25 - stirring motor, 26 - aeration device, 27 - monitoring device, 3 - sedimentation tank, 31 - first sedimentation baffle, 311 - outer slide plate, 312 - inner slide plate, 313 - traction rope, 314 - limit block, 315 - sliding groove, 316 - sliding block, 317 - limit slot, 32 - second sedimentation baffle, 33 - third sedimentation baffle, 34 - first guide pipe, 35 - fixed shaft, 4 - intermediate water tank, 41 - second guide pipe, 5 - cell immobilized anaerobic ammonia oxidation reactor, 51 - second return pipe, 52 - third guide pipe, 6 - water tank, 7 - guide pump, 8 - drive motor, 81 - telescopic rod, 82 - mud scraping plate, 9 - mud suction pipe group, 91 - main pipe, 92 - branch pipe. DETAILED DESCRIPTION

[0047] Example 1

[0048] As shown in Figure 1 and 2 , a short-range nitrification and denitrification reactor, comprising water tank 1, short-range nitrification and denitrification reactor 2, sedimentation tank 3, intermediate water tank 4, cell immobilized anaerobic ammonia oxidation reactor 5 and water tank 6 in turn;

[0049] As shown in Figures 1 to 3As shown, one side of the bottom of the short-cut nitrification and denitrification reaction tower 2 is connected with the water inlet tank 1 through the water inlet pipe 11, one side of the top of the short-cut nitrification and denitrification reaction tower 2 is connected with one side of the top of the sedimentation tank 3 through the first water outlet pipe 21, the middle part of the first water outlet pipe 21 is provided with a booster pump 22, one side of the top of the sedimentation tank 3 is connected with the intermediate water tank 4 through the first flow guide pipe 34, one side of the bottom of the intermediate water tank 4 is connected with the bottom of the cell immobilization anaerobic ammonia oxidation reactor 5 through the second flow guide pipe 41, one side of the top of the cell immobilization anaerobic ammonia oxidation reactor 5 is connected with the water outlet tank 6 through the third flow guide pipe 52, the middle part of the short-cut nitrification and denitrification reaction tower 2 is provided with a stirring rod 24, the stirring rod 24 is driven to rotate by a stirring motor 25 located at the top of the short-cut nitrification and denitrification reaction tower 2, one side of the middle part of the short-cut nitrification and denitrification reaction tower 2 is provided with an aeration device 26, the aeration device 26 includes a microporous aeration disc, a gas flow meter, a gas flow valve and a gas pump, the upper part of the short-cut nitrification and denitrification reaction tower 2 is provided with a monitoring device 27, the monitoring device 27 includes a pH meter for real-time monitoring of the pH value inside the short-cut nitrification and denitrification reaction tower 2, a dissolved oxygen measuring instrument for real-time monitoring of the dissolved oxygen inside the short-cut nitrification and denitrification reaction tower 2, an oxidation-reduction potential measuring instrument for real-time monitoring of the oxidation-reduction potential inside the short-cut nitrification and denitrification reaction tower 2, an ammonia nitrogen probe for real-time monitoring of the ammonia nitrogen concentration inside the short-cut nitrification and denitrification reaction tower 2, a nitrite probe for real-time monitoring of the nitrite concentration inside the short-cut nitrification and denitrification reaction tower 2, the gas pump, the pH meter, the dissolved oxygen measuring instrument, the oxidation-reduction potential measuring instrument, the ammonia nitrogen probe and the nitrite probe are all connected with a programmable logic controller;

[0050] As Figures 4 to 9As shown, the inside of the sedimentation tank 3 is provided with three mutually parallel and inclined sedimentation distribution plates, from top to bottom in turn are the first retractable sedimentation distribution plate 31, the second sedimentation distribution plate 32 and the third sedimentation distribution plate 33, the first sedimentation distribution plate 31 is above the bottom end of the first drain pipe 21, the third sedimentation distribution plate 33 is located at the bottom of the sedimentation tank 3, one side of the bottom of the sedimentation tank 3 is connected with the bottom of the short-cut nitrification and denitrification reaction tower 2 through three equally spaced first reflux pipes 23, the first sedimentation distribution plate 31 includes an outer sliding plate 311 and an inner sliding plate 312 which are slidably sleeved with each other, the bottom of the outer sliding plate 311 is fixedly connected with the side wall of the sedimentation tank 3, the upper end of the inner sliding plate 312 is provided with a traction rope 313, the traction rope 313 is fixedly connected with a limiting block 314 located at the bottom of the outer sliding plate 311 after passing around a fixed shaft 35 provided on the inner wall of the sedimentation tank 3, the outer wall of the sedimentation tank 3 is provided with a driving motor 8, the output end of the driving motor 8 is provided with an extension rod 81, the end of the extension rod 81 is provided with a mud scraping plate 82 after penetrating through the sedimentation tank 3, the mud scraping plate 82 is provided in an inverted T shape, the bottom running track of the mud scraping plate 82 is flush with the upper surface of the second sedimentation distribution plate 32, the fixed shaft 35 is located above the initial position of the mud scraping plate 82, the top of the mud scraping plate 82 is in abutment with the limiting block 314 when sliding, the limiting block 314 is slidably connected with a sliding groove 315 provided at the bottom of the outer sliding plate 311, two limiting blocks 314 are respectively provided on both sides of the top of the limiting block 314, and the limiting blocks 314 are slidably connected with limiting grooves 317 provided at the top of the sliding groove 315;

[0051] As shown in Figure 5 , the inlet end of the lowermost one of the first reflux pipes 23 is provided with a suction pipe group 9, the suction pipe group 9 includes a main pipe 91 and six branch pipes 92, each branch pipe 92 is symmetrically arranged on the two sides of the main pipe 91, and the bottom of the main pipe 91 and the branch pipes 92 is provided with an opening;

[0052] As shown in Figure 4 , among the three first reflux pipes 23, the inlet end of the lowermost one of the first reflux pipes 23 is between the second sedimentation distribution plate 32 and the third sedimentation distribution plate 33, the inlet end of the middle one of the first reflux pipes 23 is between the second sedimentation distribution plate 32 and the first sedimentation distribution plate 31, and the inlet end of the uppermost one of the first reflux pipes 23 is above the first sedimentation distribution plate 31;

[0053] As shown in Figure 1 , one side of the top of the cell immobilized anaerobic ammonia oxidation reactor 5 is communicated with the bottom of the cell immobilized anaerobic ammonia oxidation reactor 5 through the second reflux pipe 51, and the water inlet pipe 11, the first reflux pipe 23, the second reflux pipe 51, the first flow guide pipe 34, the second flow guide pipe 41 and the third flow guide pipe 52 are all provided with flow guide pumps 7.

[0054] Example 2

[0055] The difference between this embodiment and example 1 is that:

[0056] The suction pipe group 9 comprises a main pipe 91 and 8 branch pipes 92, and each branch pipe 92 is symmetrically arranged on both sides of the main pipe 91.

[0057] Embodiment 3

[0058] The embodiment is a running method of the short-cut nitrification and denitrification reactor in embodiment 1, comprising the following steps:

[0059] S1, sludge inoculation: inoculating aerobic sludge from a sewage plant into the short-cut nitrification and denitrification reactor tower 2, so that the concentration of the aerobic sludge in the short-cut nitrification and denitrification reactor tower 2 is maintained at 4000 mg / L;

[0060] S2, nitrification and denitrification treatment:

[0061] S2-1, pretreatment: pumping the ammonia-nitrogen-containing wastewater in the water inlet tank 1 into the bottom of the short-cut nitrification and denitrification reactor tower 2 through the water inlet pipe 11, and performing nitrification and denitrification reaction during the upward movement of the ammonia-nitrogen-containing wastewater, and when the ammonia-nitrogen-containing wastewater reaches the top of the short-cut nitrification and denitrification reactor tower 2, the ammonia-nitrogen-containing wastewater is discharged into the sedimentation tank 3 through the first drainage pipe 21, at this time, the first sedimentation flow distribution plate 31 is elongated, so that the ammonia-nitrogen-containing wastewater is backflowed to the short-cut nitrification and denitrification reactor tower 2 through the first backflow pipe 23 located at the uppermost position, until the nitrite accumulation rate in the short-cut nitrification and denitrification reactor tower 2 is 96%;

[0062] S2-2, continuous treatment: retracting the first sedimentation flow distribution plate 31, so that the pretreated ammonia-nitrogen-containing wastewater enters the sedimentation tank 3 and is sequentially precipitated through the first sedimentation flow distribution plate 31, the second sedimentation flow distribution plate 32 and the third sedimentation flow distribution plate 33, and the precipitated wastewater is pumped into the intermediate water tank 4 through the first flow guide pipe 34, and then pumped into the cell immobilization anaerobic ammonia oxidation reactor 5 through the second flow guide pipe 41, while a part of the wastewater is backflowed through the first backflow pipe 23 located at the lowermost and uppermost positions;

[0063] The backflow amount of the first backflow pipe 23 located at the uppermost position is 6% of the total wastewater flow, and the backflow amount of the first backflow pipe 23 located at the lowermost position is 12% of the total wastewater flow;

[0064] S2-3, post-treatment: before the next treatment is performed after the ammonia-nitrogen-containing wastewater is treated, the sludge precipitated on the upper surface of the second sedimentation flow distribution plate 32 is scraped off by the mud scraper 82 and backfed into the short-cut nitrification and denitrification reactor tower 2 through the first backflow pipe 23 located in the middle, and at the same time, the mud scraper 82 elongates the first sedimentation flow distribution plate 31, so that the sludge precipitated on the surface of the first sedimentation flow distribution plate 31 during the pretreatment is washed and carried by the booster pump 22, and backfed into the short-cut nitrification and denitrification reactor tower 2 through the first backflow pipe 23 located at the uppermost position;

[0065] Description: The scraper 82 is driven to slide by the driving motor 8. When the top of the scraper 82 passes the position of the limiting block 314, the limiting block 314 is pushed to slide downward along the sliding groove 315, so that the inner sliding plate 312 is pulled out of the outer sliding plate 311 by the traction rope 313, until the limiting block 314 slides to the bottom of the sliding groove 315; when the scraper 82 finishes scraping and the pretreated sludge is carried by the flushing, the inner sliding plate 312 automatically slides back into the outer sliding plate 311 under the action of gravity, and the limiting block 314 is reset by the traction rope 313;

[0066] S3, cell immobilized anaerobic ammonia oxidation treatment: the anaerobic ammonia oxidation granular sludge is dispersed into flocculent biomass and immobilized in the cell immobilized anaerobic ammonia oxidation reactor 5, the wastewater treated continuously in S2-2 is pumped into the cell immobilized anaerobic ammonia oxidation reactor 5, the anaerobic ammonia oxidation granular sludge concentration in the cell immobilized anaerobic ammonia oxidation reactor 5 is controlled to be 10000 mg / L, the hydraulic retention time is 12 h, and part of the wastewater is refluxed by the second reflux pipe 51 to ensure that the upward flow velocity in the cell immobilized anaerobic ammonia oxidation reactor 5 is 4 m / h.

[0067] Example 4

[0068] The difference between this example and example 3 is that:

[0069] S1, sludge inoculation: the aerobic sludge from the sewage plant is inoculated into the short-cut nitrification and denitrification reactor tower 2, so that the concentration of the aerobic sludge in the short-cut nitrification and denitrification reactor tower 2 is maintained at 3000 mg / L.

[0070] Example 5

[0071] The difference between this example and example 3 is that:

[0072] S1, sludge inoculation: the aerobic sludge from the sewage plant is inoculated into the short-cut nitrification and denitrification reactor tower 2, so that the concentration of the aerobic sludge in the short-cut nitrification and denitrification reactor tower 2 is maintained at 6000 mg / L.

[0073] Example 6

[0074] The difference between this example and example 3 is that:

[0075] S2-1, pretreatment: the ammonia-nitrogen-containing wastewater in the water inlet tank 1 is pumped into the bottom of the short-cut nitrification and denitrification reaction tower 2 through the water inlet pipe 11, and the ammonia-nitrogen-containing wastewater is subjected to nitrification and denitrification reaction during the upward process, and when it rises to the top of the short-cut nitrification and denitrification reaction tower 2, it is discharged into the sedimentation tank 3 through the first drainage pipe 21, at this time the first sedimentation shunt plate 31 is elongated, so that the ammonia-nitrogen-containing wastewater is backflowed into the short-cut nitrification and denitrification reaction tower 2 through the first backflow pipe 23 located at the uppermost position, until the nitrite accumulation rate in the short-cut nitrification and denitrification reaction tower 2 is 97%.

[0076] Example 7

[0077] The difference between this embodiment and Example 3 is that:

[0078] S2-1, pretreatment: the ammonia-nitrogen-containing wastewater in the water inlet tank 1 is pumped into the bottom of the short-cut nitrification and denitrification reaction tower 2 through the water inlet pipe 11, and the ammonia-nitrogen-containing wastewater is subjected to nitrification and denitrification reaction during the upward process, and when it rises to the top of the short-cut nitrification and denitrification reaction tower 2, it is discharged into the sedimentation tank 3 through the first drainage pipe 21, at this time the first sedimentation shunt plate 31 is elongated, so that the ammonia-nitrogen-containing wastewater is backflowed into the short-cut nitrification and denitrification reaction tower 2 through the first backflow pipe 23 located at the uppermost position, until the nitrite accumulation rate in the short-cut nitrification and denitrification reaction tower 2 is 98%.

[0079] Example 8

[0080] The difference between this embodiment and Example 3 is that:

[0081] The backflow amount of the first backflow pipe 23 located at the uppermost position is 5% of the total wastewater flow, and the backflow amount of the first backflow pipe 23 located at the lowermost position is 10% of the total wastewater flow.

[0082] Example 9

[0083] The difference between this embodiment and Example 3 is that:

[0084] The backflow amount of the first backflow pipe 23 located at the uppermost position is 8% of the total wastewater flow, and the backflow amount of the first backflow pipe 23 located at the lowermost position is 15% of the total wastewater flow.

[0085] Note: the parameters in Example 3, Example 8 and Example 9 are in equal proportion, because when sludge and wastewater are recovered, the backflow amount is adjusted in real time according to the sludge content in the short-cut nitrification and denitrification reaction tower 2, and when the sludge reduction in the short-cut nitrification and denitrification reaction tower 2 increases, the backflow amount is appropriately increased, that is, the parameters in Example 9 are selected, and vice versa, the parameters in Example 3 or 8 are selected.

[0086] Example 10

[0087] The difference between this embodiment and Example 3 is that:

[0088] S3, cell immobilized anaerobic ammonia oxidation treatment: the anaerobic ammonia oxidation granular sludge is dispersed into flocculent biomass and fixed inside the cell immobilized anaerobic ammonia oxidation reactor 5, the wastewater after continuous treatment in S2-2 is pumped into the cell immobilized anaerobic ammonia oxidation reactor 5, the anaerobic ammonia oxidation granular sludge concentration in the cell immobilized anaerobic ammonia oxidation reactor 5 is controlled to be 6000 mg / L, the hydraulic retention time is 6 h, part of the wastewater is controlled to be refluxed through the second reflux pipe 51, and the upward flow velocity in the cell immobilized anaerobic ammonia oxidation reactor 5 is ensured to be 3 m / h.

[0089] Example 11

[0090] The difference between this embodiment and example 3 is that:

[0091] S3, cell immobilized anaerobic ammonia oxidation treatment: the anaerobic ammonia oxidation granular sludge is dispersed into flocculent biomass and fixed inside the cell immobilized anaerobic ammonia oxidation reactor 5, the wastewater after continuous treatment in S2-2 is pumped into the cell immobilized anaerobic ammonia oxidation reactor 5, the anaerobic ammonia oxidation granular sludge concentration in the cell immobilized anaerobic ammonia oxidation reactor 5 is controlled to be 20000 mg / L, the hydraulic retention time is 24 h, part of the wastewater is controlled to be refluxed through the second reflux pipe 51, and the upward flow velocity in the cell immobilized anaerobic ammonia oxidation reactor 5 is ensured to be 5 m / h.

[0092] Note: The parameter adjustment in example 3 and examples 10 and 11 is adjusted according to the ammonia nitrogen concentration in the wastewater, when the ammonia nitrogen concentration in the wastewater is greater, the required anaerobic ammonia oxidation granular sludge concentration is greater, and the hydraulic retention time is longer, and vice versa.

[0093] Example 12

[0094] This embodiment is an application of a short-cut nitrification and denitrification reactor in example 1, and the short-cut nitrification and denitrification reactor is applied to efficient and low-power consumption denitrification treatment of biogas slurry of a pig farm.

[0095] Experimental example

[0096] After the reactor is stably operated, the COD concentration in the final effluent of the process section is 400-450 mg / L, the NH4 + -N concentration is less than 15 mg / L, the NO2 - -N concentration is less than 15 mg / L, the NO3 - -N concentration is less than 40 mg / L, the total nitrogen concentration is less than 70 mg / L, the remaining COD is refractory organic matter, and subsequent physicochemical means is required to remove, and the wastewater denitrification target is completed.

Claims

1. A method for operating a short-cut nitrification-denitrification reactor, characterized in that, The reactor comprises a water inlet tank (1), a short-cut nitrification and denitrification reaction tower (2), a sedimentation tank (3), an intermediate water tank (4), a cell immobilized anaerobic ammonia oxidation reactor (5) and a water outlet tank (6) connected in sequence; One side of the bottom of the short-cut nitrification and denitrification reaction tower (2) is connected with the water inlet tank (1) through a water inlet pipe (11), one side of the top of the short-cut nitrification and denitrification reaction tower (2) is connected with one side of the top of the sedimentation tank (3) through a first drainage pipe (21), a booster pump (22) is arranged in the middle of the first drainage pipe (21), and the inside of the sedimentation tank (3) is provided with three mutually parallel and inclined sedimentation shunt plates, namely a telescopic first sedimentation shunt plate (31), a second sedimentation shunt plate (32) and a third sedimentation shunt plate (33) from top to bottom, the top of the first sedimentation shunt plate (31) corresponds to the bottom end of the first drainage pipe (21), and the third sedimentation shunt plate (33) is located at the bottom of the sedimentation tank (3), and one side of the bottom of the sedimentation tank (3) is connected with the bottom of the short-cut nitrification and denitrification reaction tower (2) through three first reflux pipes (23) arranged at equal intervals; The first sedimentation shunt plate (31) comprises an outer sliding plate (311) and an inner sliding plate (312) which are slidably sleeved with each other, the bottom of the outer sliding plate (311) is fixedly connected with the side wall of the sedimentation tank (3), the middle of the upper end of the inner sliding plate (312) is provided with a traction rope (313), the traction rope (313) is fixedly connected with a limiting block (314) located at the bottom of the outer sliding plate (311) after passing around a fixed shaft (35) arranged on the inner wall of the sedimentation tank (3), a drive motor (8) is arranged on the outer wall of the sedimentation tank (3), an extension rod (81) is arranged at the output end of the drive motor (8), and a mud scraping plate (82) is arranged at the tail end of the extension rod (81) after penetrating through the sedimentation tank (3), the mud scraping plate (82) is arranged in an inverted T shape, the bottom of the mud scraping plate (82) runs along a track flush with the upper surface of the second sedimentation shunt plate (32), the fixed shaft (35) is located above the initial position of the mud scraping plate (82), and the top of the mud scraping plate (82) is in abutment with the limiting block (314) when sliding; Among the three first reflux pipes (23), the inlet end of the lowermost first reflux pipe (23) corresponds to the space between the second sedimentation shunt plate (32) and the third sedimentation shunt plate (33), the inlet end of the middle first reflux pipe (23) corresponds to the space between the second sedimentation shunt plate (32) and the first sedimentation shunt plate (31), and the inlet end of the uppermost first reflux pipe (23) corresponds to the space above the first sedimentation shunt plate (31); The top of the cell immobilized anaerobic ammonia oxidation reactor (5) is connected with the bottom of the cell immobilized anaerobic ammonia oxidation reactor (5) through a second reflux pipe (51); The operation method comprises the following steps: S1, sludge inoculation: inoculating aerobic sludge from a sewage plant into the short-cut nitrification and denitrification reaction tower (2) so that the concentration of the aerobic sludge in the short-cut nitrification and denitrification reaction tower (2) is maintained at 3000-6000 mg / L; S2, nitration denitrification treatment: S2-1, pretreatment: the ammonia-nitrogen-containing wastewater in the water inlet tank (1) is pumped into the bottom of the short-cut nitrification-denitrification reactor (2) through the water inlet pipe (11), and the ammonia-nitrogen-containing wastewater is subjected to nitrification-denitrification reaction during the upward process. When it rises to the top of the short-cut nitrification-denitrification reactor (2), it is discharged into the sedimentation tank (3) through the first drainage pipe (21). At this time, the first sedimentation shunt plate (31) is elongated, so that the ammonia-nitrogen-containing wastewater is backflowed into the short-cut nitrification-denitrification reactor (2) through the uppermost first backflow pipe (23). Until the nitrite accumulation rate in the short-cut nitrification-denitrification reactor (2) is greater than 95%; S2-2, continuous treatment: the first sedimentation shunt plate (31) is retracted, so that the pretreated ammonia-nitrogen-containing wastewater enters the sedimentation tank (3) and is sequentially precipitated through the first sedimentation shunt plate (31), the second sedimentation shunt plate (32) and the third sedimentation shunt plate (33). The precipitated wastewater is pumped into the intermediate water tank (4) through the first guide pipe (34), and then pumped into the cell-immobilized anaerobic ammonia oxidation reactor (5) through the second guide pipe (41). At the same time, a part of the wastewater is backflowed through the lowermost and uppermost first backflow pipes (23); S2-3, post-treatment: when the ammonia-nitrogen-containing wastewater treatment is completed, before the next treatment, the sludge sediment on the surface of the second sedimentation shunt plate (32) is scraped off by the mud scraper (82) and backflowed into the short-cut nitrification-denitrification reactor (2) through the middle first backflow pipe (23). At the same time, the mud scraper (82) elongates the first sedimentation shunt plate (31), so that the sludge sediment on the surface of the first sedimentation shunt plate (31) is washed and carried by the booster pump (22) during the pretreatment, and backflowed into the short-cut nitrification-denitrification reactor (2) through the uppermost first backflow pipe (23); S3, cell-immobilized anaerobic ammonia oxidation treatment: the anaerobic ammonia oxidation granular sludge is dispersed into flocculent biomass and immobilized in the cell-immobilized anaerobic ammonia oxidation reactor (5). The wastewater treated continuously in S2-2 is pumped into the cell-immobilized anaerobic ammonia oxidation reactor (5). The anaerobic ammonia oxidation granular sludge concentration in the cell-immobilized anaerobic ammonia oxidation reactor (5) is controlled to be 6000-20000 mg / L, the hydraulic retention time is 6-24 h, and part of the wastewater is backflowed through the second backflow pipe (51) to ensure that the upward flow rate in the cell-immobilized anaerobic ammonia oxidation reactor (5) is 3-5 m / h.

2. The method of claim 1, wherein the short-cut nitrification and denitrification reactor is operated at a temperature of 10 to 40°C, a pH of 6 to 9, and a dissolved oxygen concentration of 0.1 to 0.5 mg / L. The top side of the sedimentation tank (3) is connected with the intermediate water tank (4) through the first flow guide pipe (34), the bottom side of the intermediate water tank (4) is connected with the bottom of the cell immobilization anaerobic ammonia oxidation reactor (5) through the second flow guide pipe (41), the top side of the cell immobilization anaerobic ammonia oxidation reactor (5) is connected with the effluent water tank (6) through the third flow guide pipe (52), the middle part of the short-cut nitrification and denitrification reaction tower (2) is provided with the stirring rod (24), the stirring rod (24) is driven to rotate by the stirring motor (25) located at the top of the short-cut nitrification and denitrification reaction tower (2), the middle side of the short-cut nitrification and denitrification reaction tower (2) is provided with the aeration device (26), and the upper part of the short-cut nitrification and denitrification reaction tower (2) is provided with the monitoring device (27).

3. The method of claim 2, wherein the short-cut nitrification and denitrification reactor is operated at a temperature of 10 to 40°C, a pH of 6 to 8, and a dissolved oxygen concentration of 0.1 to 0.5 mg / L. The water inlet pipe (11), the first reflux pipe (23), the second reflux pipe (51), the first flow guide pipe (34), the second flow guide pipe (41) and the third flow guide pipe (52) are all provided with the flow guide pump (7).

4. The method of claim 1, wherein the short-cut nitrification and denitrification reactor is operated at a temperature of 10 to 40°C, a pH of 6 to 9, and a dissolved oxygen concentration of 0.1 to 0.5 mg / L. The limiting block (314) is in sliding connection with the sliding groove (315) provided at the bottom of the outer sliding plate (311), the limiting block (314) is provided with a sliding block (316) on each of the two sides of the top, and the sliding block (316) is in sliding connection with the limiting groove (317) provided at the top of the sliding groove (315).

5. The method of claim 1, wherein the short-cut nitrification and denitrification reactor is operated at a temperature of 10 to 40°C, a pH of 6 to 9, and a dissolved oxygen concentration of 0.1 to 0.5 mg / L. The inlet end of the first reflux pipe (23) located at the lowermost position is provided with the suction pipe group (9), the suction pipe group (9) comprises a main pipe (91) and a plurality of branch pipes (92), each branch pipe (92) is symmetrically arranged on the two sides of the main pipe (91), and the main pipe (91) and the branch pipes (92) are all provided with openings at the bottom.

6. The method of claim 1, wherein the short-cut nitrification and denitrification reactor is operated at a temperature of 10 to 40°C, a pH of 6 to 8, and a dissolved oxygen concentration of 0.1 to 0.5 mg / L. The reflux amount of the first reflux pipe (23) located at the uppermost position in S2-2 is 5-8% of the total wastewater flow, and the reflux amount of the first reflux pipe (23) located at the lowermost position is 10-15% of the total wastewater flow.

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