CN115286181A - Short-cut nitrification and denitrification biological fluidized bed sewage treatment device and process - Google Patents
Short-cut nitrification and denitrification biological fluidized bed sewage treatment device and process Download PDFInfo
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- CN115286181A CN115286181A CN202210969059.6A CN202210969059A CN115286181A CN 115286181 A CN115286181 A CN 115286181A CN 202210969059 A CN202210969059 A CN 202210969059A CN 115286181 A CN115286181 A CN 115286181A
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- 238000000034 method Methods 0.000 title claims abstract description 35
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- 238000006243 chemical reaction Methods 0.000 claims description 21
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- 230000009471 action Effects 0.000 claims description 5
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- 239000011574 phosphorus Substances 0.000 claims description 5
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- 239000002912 waste gas Substances 0.000 claims description 5
- 238000004065 wastewater treatment Methods 0.000 claims 5
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a sewage treatment device and a sewage treatment process for a short-cut nitrification and denitrification biological fluidized bed, which comprises an adjusting tank, a sewage lifting pump, a biological fluidized bed reactor and a settling tank which are connected in sequence, wherein a sludge return port, a water inlet and an air inlet are arranged below the biological fluidized bed reactor, the water inlet is connected with the sewage lifting pump through a pipeline, a sludge discharge port is arranged at the bottom of the settling tank, a sewage return flow pump is also arranged between the sludge discharge port and the sludge return port, and the air inlet is connected with an air compressor through a pipeline; the biological fluidized bed reactor is also internally provided with a plurality of vertical guide cylinders, and the ratio of the sectional area of the outer ring of each guide cylinder to the sectional area of the inner ring of each guide cylinder is 1.3-1.6. According to the invention, through low-oxygen enrichment culture, microbial flora is increased, the design parameters of internal components are changed, short-cut nitrification and denitrification are formed in the fluidized bed, and meanwhile, the sludge discharge is reduced in the sewage treatment process, so that the purpose of sludge reduction is achieved.
Description
Technical Field
The invention belongs to the technical field, and particularly relates to a sewage treatment device and a sewage treatment process of a short-cut nitrification and denitrification biological fluidized bed.
Background
In recent years, with the improvement of national environmental standards, the discharge index of a sewage treatment plant is further improved, the original treatment process is often difficult to meet the discharge requirement, and many sewage treatment plants face the problem of upgrading and transformation, wherein total nitrogen is taken as an important discharge standard, and the treatment difficulty and the high cost are difficult to solve by the sewage treatment plant. Researches find that the activated sludge can be acclimated and enriched under the condition of long-term low dissolved oxygen to obtain stable low-dissolved-oxygen full-range nitrified sludge, and compared with the traditional nitrified sludge, the activated sludge has more stable specific nitrification rate and can save the consumption of the dissolved oxygen.
In the traditional denitrification process, denitrifying bacteria use organic matters as electron donors to reduce nitrate nitrogen into nitrogen, and the combined technology of short-cut denitrifying anaerobic ammonium oxidation is a biological autotrophic denitrification process that firstly heterotrophic denitrifying bacteria are used to reduce nitrate nitrogen into nitrite nitrogen, and then anaerobic oxidizing bacteria are used to oxidize ammonia nitrogen into nitrogen by taking nitrite hydrogen as electron acceptors.
Chinese patent application No. 202011011107.8 discloses a device and a method for realizing deep denitrification of municipal sewage by integrated shortcut nitrification-anaerobic ammonia oxidation coupling endogenous shortcut denitrification, and the process combines shortcut nitrification-anaerobic ammonia oxidation coupling endogenous shortcut denitrification to be applied to the denitrification process of the municipal sewage with lower C/N ratio, thereby solving the troublesome problems of larger energy consumption, insufficient carbon source, large sludge yield and the like in the traditional process. The invention creatively provides the integration of anaerobic ammonia oxidation and endogenous short-cut denitrification, so that nitrite nitrogen generated by short-cut nitrification can be directly used as a matrix for anaerobic ammonia oxidation, the advantages of denitrifying glycan bacteria are fully exerted, nitrate nitrogen generated by anaerobic ammonia oxidation is used as an electron acceptor for endogenous short-cut denitrification, the purpose of deep denitrification of domestic sewage is realized, the treatment load is high, and the effect is good. However, the present process has been accomplished on the basis of the descriptions given herein on wastewater having a relatively low COD content (165-275 mg/L), and thus, it is still uncertain whether the process is effective on wastewater having a high COD content.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a short-cut nitrification and denitrification biological fluidized bed sewage treatment device and a process, which increase microbial flora through low-oxygen enrichment culture, change the design parameters of internal components, form short-cut nitrification and denitrification in the fluidized bed, reduce sludge discharge in the sewage treatment process to achieve the purpose of sludge reduction, and have good effect on treating sewage with high-concentration COD content.
In order to achieve the purpose, the invention provides the following technical scheme:
a sewage treatment device of a short-cut nitrification and denitrification biological fluidized bed comprises an adjusting tank, a sewage lifting pump, a biological fluidized bed reactor and a settling tank which are connected in sequence, wherein a sludge return port, a water inlet and an air inlet are arranged below the biological fluidized bed reactor, the water inlet is connected with the sewage lifting pump through a pipeline, a sludge discharge port is arranged at the bottom of the settling tank, a sewage backflow pump is further arranged between the sludge discharge port and the sludge return port, and the air inlet is connected with an air compressor through a pipeline;
the biological fluidized bed reactor is also internally provided with a plurality of vertical guide cylinders, and the ratio of the sectional area of the outer ring of each guide cylinder to the sectional area of the inner ring of each guide cylinder is 1.3-1.6.
Preferably, a gas distributor is further arranged below the guide shell, and the gas inlet is positioned below the gas distributor; a baffle plate is also arranged above the guide cylinder.
Preferably, the biological fluidized bed reactor and the top of the settling tank are provided with a tail gas outlet, and the tail gas outlet is communicated with a tail gas collecting system; a first water outlet is arranged above the biological fluidized bed reactor.
Preferably, a second water outlet is formed in the upper portion of the settling tank and communicated with the sewage recovery device through a pipeline.
The invention also provides a process for treating sewage by using the sewage treatment device, which comprises the following steps:
(1) The sewage after the physicochemical pretreatment enters an adjusting tank, is subjected to pH, nitrogen and phosphorus adjustment in the adjusting tank and then enters a biological fluidized bed reactor through a sewage lifting pump;
(2) Starting an air compressor, aerating, and enabling sewage to carry out anoxic reaction and aerobic reaction in the biological fluidized bed reactor (2), wherein the sewage enters a settling tank from a first water outlet after the reaction is finished;
(3) After the sewage entering the settling tank is settled, one part of the sewage flows out from a sludge discharge hole at the bottom and flows back to the biological fluidized bed reactor under the action of a sludge reflux pump, the other part of supernatant is discharged to other sewage recovery equipment from a second water outlet above the settling tank, and meanwhile, the waste gas in the biological fluidized bed reactor and the settling tank enters a tail gas collection system through a tail gas outlet at the top.
Preferably, the pH of the sewage after being adjusted in the step (1) is 6-7,C: n: p =100:4-8:1-3.
Preferably, the sewage in the step (1) is pure activated sludge (the sludge concentration is 3500-7000mg/L, pure activated sludge process) or sewage filled with 10-20% carrier mixed activated sludge (the sludge concentration is 1000-2500mg/L, sludge membrane mixing process).
Preferably, the air inflow is controlled during the aeration in the step (2), so that the dissolved oxygen concentration in the biological fluid bed reactor is 0.8-1mg/L.
Preferably, the residence time of the biological fluidized bed reactor (2) in the step (2) is 12-15h.
Preferably, the sludge reflux ratio in the step (3) is 50-300%.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention provides a short-cut nitrification and denitrification biological fluidized bed sewage treatment device, which is characterized in that the ratio parameter (outer ring area: inner ring area) of the inner ring area and the outer ring area of a guide shell in a fluidized bed is changed, so that oxygen in the guide shell is dissolved into water to the greatest extent possible in the ascending process, bubbles are released at an expanded section at the top, the aerobic condition is realized, a small amount of bubbles or no bubbles are carried under the condition that the downward flow speed of liquid outside the guide shell is reduced, dissolved oxygen is consumed in the descending process to reach the anoxic condition, the dissolved oxygen is between 0.8 and 1.0mg/L under the condition that the whole dissolved oxygen of the fluidized bed is controlled to be in a lower state, and most of the inside of the whole fluidized bed is in the low dissolved oxygen state, so that the enrichment culture of low dissolved oxygen flora can be realized, and the denitrification reaction can be realized while COD and ammonia nitrogen are removed.
(2) The short-cut nitrification and denitrification biological fluidized bed sewage treatment device provided by the invention carries out nitrification and denitrification in the fluidized bed, not only shortens the reaction flow, but also can greatly reduce the sewage treatment cost.
(3) The invention adopts a combined process of a biological fluidized bed reactor and a settling tank, and performs aerobic and anoxic reactions in the fluidized bed through 50-300% of reflux between the biological fluidized bed reactor and the settling tank to perform denitrification treatment.
(4) The invention is not limited to other modifications of the components in the fluidized bed, such as adding a cap or a baffle plate at the top of the guide shell, or filling no carrier, replacing the guide shell with high-concentration sludge, adopting aerobic granular sludge and the like, and the like.
Drawings
FIG. 1 is a schematic view of a sewage treatment plant of a short-cut nitrification-denitrification biological fluidized bed of the present invention;
FIG. 2 is a cross-sectional view of a biological fluidized bed reactor of the present invention.
Wherein, 1, adjusting pool; 2. a biological fluidized bed reactor; 3. a settling tank; 4. a sewage lift pump; 5. an air compressor; 6. a sludge reflux pump; 7. a draft tube; 8. a sludge discharge port; 9. a sludge return port; 10. a water inlet; 11. an air inlet; 12. a first water outlet; 13. a second water outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
As shown in fig. 1, a short-cut nitrification and denitrification biological fluidized bed sewage treatment device comprises an adjusting tank 1, a sewage lifting pump 4, a biological fluidized bed reactor 2 and a settling tank 3 which are connected in sequence, and is characterized in that a sludge return port 9, a water inlet 10 and an air inlet 11 are arranged below the biological fluidized bed reactor 2, the water inlet 10 is connected with the sewage lifting pump 4 through a pipeline, a sludge discharge port 8 is arranged at the bottom of the settling tank 3, a sludge return pump 6 is arranged between the sludge discharge port 8 and the sludge return port 9, and the air inlet 10 is connected with an air compressor 5 through a pipeline;
a plurality of vertical guide cylinders 7 are also arranged in the biological fluidized bed reactor 2, and the ratio of the cross section area of the outer ring of each guide cylinder to the cross section area of the inner ring of each guide cylinder is 1.3-1.6, and can be 1.3, 1.35, 1.4, 1.45, 1.5, 1.55 and 1.6, preferably 1.4; as shown in fig. 2, the cross-sectional area of the outer ring of the draft tube is the cross-sectional area of the annular space between the outside of the draft tube and the inner wall of the biological fluidized bed reactor.
In the biochemical unit for treating sewage, when the parameter of the annular space ratio (outer annular area: inner annular area) is adjusted to be 1.3-1.6 in the aerobic biochemical process, aerobic reaction and anoxic reaction can be formed in the fluidized bed in the low dissolved oxygen state in the fluidized bed, so that different functions can be realized in different reaction regions.
In some embodiments, a gas distributor is further arranged below the guide shell 7, and one or more carriers with different forms and shapes can be arranged in the distributor to increase the sludge concentration and increase the sludge activity; the gas inlet 11 is positioned below the gas distributor; a baffle plate is arranged above the guide cylinder 7.
In some embodiments, the biological fluidized bed reactor 2 and the settling tank 3 are provided with a tail gas outlet at the top, and the tail gas outlet is communicated with a tail gas collecting system; a first water outlet 12 is arranged above the biological fluidized bed reactor 2.
In some embodiments, a second water outlet 13 is arranged above the settling tank 3, and the second water outlet is communicated with the sewage recovery device through a pipeline.
A short-cut nitrification and denitrification biological fluidized bed sewage treatment process comprises the following steps:
(1) The sewage after the materialization pretreatment enters an adjusting tank 1, is subjected to pH, nitrogen and phosphorus adjustment in the adjusting tank 1 and then enters a biological fluidized bed reactor 2 through a sewage lifting pump 4;
(2) Starting an air compressor 5 to carry out aeration so that the sewage is subjected to anoxic reaction and aerobic reaction in the biological fluidized bed reactor 2, and after the reaction is finished, the sewage enters a settling tank 3 from a first water outlet 12;
(3) After the sewage entering the settling tank 3 is settled, one part of the sewage flows out from a sludge discharge port 8 at the bottom and flows back to the biological fluidized bed reactor 2 under the action of the sludge reflux pump 6, the other part of the supernatant is discharged to other sewage recovery equipment from a second water outlet 13 above the settling tank 3, and meanwhile, the waste gas in the biological fluidized bed reactor 2 and the settling tank 3 enters a tail gas collection system through a tail gas outlet at the top.
In some embodiments, the wastewater in step (1) is pure activated sludge or wastewater filled with 10-20% carrier mixed activated sludge.
In some embodiments, the amount of air input during aeration in step (2) is controlled so that the dissolved oxygen concentration in the biological fluidized bed reactor is 0.8-1mg/L, and may be 0.8mg/L, 0.85mg/L, 0.9mg/L, 0.95mg/L, 1mg/L, and preferably 0.9mg/L.
In some embodiments, the residence time of the biological fluidized bed reactor (2) in step (2) is 12-15h, and may be 12h, 12.5h, 13h, 13.5h, 14h, 14.5h, 15h, preferably 14h.
In some embodiments, the sludge reflux ratio in step (3) is 50-300%, and may be 50%, 60%, 70%, 80%, 90%, 100%, 150%, 200%, 250%, 300%, preferably 100%.
Example 1
A short-cut nitrification and denitrification biological fluidized bed sewage treatment device comprises an adjusting tank 1, a sewage lifting pump 4, a biological fluidized bed reactor 2 and a settling tank 3 which are connected in sequence, and is characterized in that a sludge return port 9, a water inlet 10 and an air inlet 11 are arranged below the biological fluidized bed reactor 2, the water inlet 10 is connected with the sewage lifting pump 4 through a pipeline, a sludge discharge port 8 is arranged at the bottom of the settling tank 3, a sludge return pump 6 is arranged between the sludge discharge port 8 and the sludge return port 9, and the air inlet 10 is connected with an air compressor 5 through a pipeline;
a plurality of vertical guide cylinders 7 are also arranged in the biological fluidized bed reactor 2, and the ratio of the sectional area of the outer ring of each guide cylinder to the sectional area of the inner ring of each guide cylinder is 1.4.
In this embodiment, a gas distributor is further disposed below the guide shell 7; the gas inlet 11 is positioned below the gas distributor; a baffle plate is arranged above the guide cylinder 7.
In this embodiment, the biological fluidized bed reactor 2 and the settling tank 3 are provided with a tail gas outlet at the top, and the tail gas outlet is communicated with a tail gas collecting system; a first water outlet 12 is arranged above the biological fluidized bed reactor 2.
In this embodiment, a second water outlet 13 is arranged above the settling tank 3, and the water outlet is communicated with the sewage recovery equipment through a pipeline.
Example 2
A process for carrying out short-cut nitrification and denitrification biological fluidized bed sewage treatment by using the device in the embodiment 1 adopts a sludge-film mixing method, the adding amount of the filler is 15%, and the sludge content is 1.5g/L, and comprises the following steps:
(1) Sewage after physicochemical pretreatment of water from a certain chemical plant enters an adjusting tank 1, after the pH, nitrogen and phosphorus are adjusted in the adjusting tank 1, the pH is 6, the COD is 2100mg/L, the BOD is 800mg/L, ammonia nitrogen is added in 75mg/L, and the sewage enters a biological fluidized bed reactor 2 through a sewage lifting pump 4;
(2) Starting the air compressor 5 for aeration, wherein the sewage treatment capacity is 1.3L/h, and the aeration capacity is 0.04m 3 Controlling the dissolved oxygen of the fluidized bed to be 0.8mg/L, so that the sewage is subjected to anoxic reaction and aerobic reaction in the biological fluidized bed reactor 2, the retention time is 12 hours, and the sewage enters the settling tank 3 from the first water outlet 12 after the reaction is finished;
(3) After the sewage entering the settling tank 3 is settled, one part of the sewage flows out from a sludge discharge port 8 at the bottom and flows back to the biological fluidized bed reactor 2 under the action of a sludge reflux pump 6, the circulating reflux proportion is 50%, the other part of supernatant is discharged to other sewage recovery equipment from a second water outlet 13 above the settling tank 3, and meanwhile, the waste gas in the biological fluidized bed reactor 2 and the settling tank 3 enters a tail gas collection system through a tail gas outlet at the top.
The COD of the tested water is below 50mg/L, the BOD is about 15mg/L, the ammonia nitrogen is less than 5mg/L, and the total nitrogen is less than 25mg/L.
Example 3
A process for treating short-cut nitrification and denitrification biological fluidized bed sewage by using the device in the embodiment 1 adopts a pure membrane method for treatment, the filling amount of the filler is 20 percent, and the process comprises the following steps:
(1) The sewage after the physicochemical pretreatment of the chemical sewage enters an adjusting tank 1, after the pH, nitrogen and phosphorus are adjusted in the adjusting tank 1, the pH is 7, the COD is 900mg/L, the BOD is 300mg/L, 45mg/L ammonia nitrogen is added, and the sewage enters a biological fluidized bed reactor 2 through a sewage lifting pump 4;
(2) Starting the air compressor 5 for aeration, wherein the sewage treatment capacity is 1.5L/h, and the aeration capacity is 0.052m 3 Controlling the dissolved oxygen of the fluidized bed to be 1.0mg/L, so that the sewage is subjected to anoxic reaction and aerobic reaction in the biological fluidized bed reactor 2, the retention time is 15 hours, and the sewage enters the settling tank 3 from the first water outlet 12 after the reaction is finished;
(3) After the sewage entering the settling tank 3 is settled, one part of the sewage flows out from a sludge discharge hole 8 at the bottom and flows back to the biological fluidized bed reactor 2 under the action of the sludge reflux pump 6, the reflux proportion is 200%, the other part of supernatant is discharged to other sewage recovery equipment from a second water outlet 13 above the settling tank 3, and meanwhile, the waste gas in the biological fluidized bed reactor 2 and the settling tank 3 enters a tail gas collection system through a tail gas outlet at the top.
The COD of the tested water is 40mg/L, the BOD is 5mg/L, the ammonia nitrogen is less than 5mg/L, the total nitrogen is less than 30mg/L, the operation period of the device exceeds 2 months, and the sludge is discharged periodically, and compared with the conventional aeration tank, the sludge yield of the process is reduced by about 20 percent.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A sewage treatment device of a short-cut nitrification and denitrification biological fluidized bed comprises an adjusting tank (1), a sewage lifting pump (4), a biological fluidized bed reactor (2) and a settling tank (3) which are sequentially connected, and is characterized in that a sludge return port (9), a water inlet (10) and an air inlet (11) are arranged below the biological fluidized bed reactor (2), the water inlet (10) is connected with the sewage lifting pump (4) through a pipeline, a sludge discharge port (8) is arranged at the bottom of the settling tank (3), a sludge return pump (6) is further arranged between the sludge discharge port (8) and the sludge return port (9), and the air inlet (10) is connected with an air compressor (5) through a pipeline;
a plurality of vertical guide cylinders (7) are also arranged in the biological fluidized bed reactor (2), and the ratio of the sectional area of the outer ring of each guide cylinder to the sectional area of the inner ring of each guide cylinder is 1.3-1.6.
2. The sewage treatment device of the short-cut nitrification and denitrification biological fluidized bed according to claim 1, wherein a gas distributor is further arranged below the guide shell (7), and the gas inlet (11) is positioned below the gas distributor; a baffle plate is also arranged above the guide cylinder (7).
3. The sewage treatment device of the short-cut nitrification and denitrification biological fluidized bed according to claim 1, wherein the biological fluidized bed reactor (2) and the top of the settling tank (3) are provided with a tail gas outlet which is communicated with a tail gas collecting system; a first water outlet (12) is arranged above the biological fluidized bed reactor (2).
4. The sewage treatment device of the short-cut nitrification and denitrification biological fluidized bed according to claim 1, wherein a second water outlet (13) is arranged above the settling tank (3) and is communicated with a sewage recovery device through a pipeline.
5. A process for treating sewage by using the sewage treatment apparatus according to any one of claims 1 to 4, comprising the steps of:
(1) The sewage after the materialization pretreatment enters an adjusting tank (1), is subjected to pH, nitrogen and phosphorus adjustment in the adjusting tank (1), and then enters a biological fluidized bed reactor (2) through a sewage lifting pump (4);
(2) Starting an air compressor (5) to carry out aeration so that the sewage is subjected to anoxic reaction and aerobic reaction in the biological fluidized bed reactor (2), and after the reaction is finished, the sewage enters a settling tank (3) from a first water outlet (12);
(3) After the sewage entering the settling tank (3) is settled, one part of the sewage flows out from a sludge discharge hole (8) at the bottom, the sewage flows back to the biological fluidized bed reactor (2) under the action of a sludge reflux pump (6), the other part of supernatant is discharged to other sewage recovery equipment from a second water outlet (13) above the settling tank (3), and meanwhile, the waste gas in the biological fluidized bed reactor (2) and the settling tank (3) enters a tail gas collection system through a tail gas outlet at the top.
6. The wastewater treatment process according to claim 5, wherein the pH of the wastewater after being adjusted in the step (1) is 6-7,C: n: p =100:4-8:1-3.
7. The wastewater treatment process according to claim 5, wherein the wastewater in step (1) is pure activated sludge or wastewater filled with 10-20% carrier-mixed activated sludge.
8. The wastewater treatment process according to claim 5, wherein the aeration in step (2) is performed by controlling the amount of intake air so that the dissolved oxygen concentration in the biological fluidized bed reactor is 0.8 to 1mg/L.
9. The wastewater treatment process according to claim 5, characterized in that the residence time of the biological fluidized bed reactor (2) in step (2) is 12-15h.
10. The wastewater treatment process according to claim 5, wherein the sludge reflux ratio in the step (3) is 50-300%.
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