Device and method for enhancing efficient nitrogen removal of oxytetracycline pharmaceutical wastewater by coupling integrated short-cut nitrification with post-denitrification
By using the anaerobic → aerobic → hypoxia operation mode and glycan bacteria enrichment technology of the sequence batch reactor in the treatment of oleracycin pharmaceutical wastewater, the problems of high energy consumption and added carbon source dependence are solved, and low energy consumption is achieved , efficient denitrification of oleracycin pharmaceutical wastewater, meets the water discharge standards of fermented pharmaceutical industry.
Patent Information
- Application Number
- CN202411711077.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2044-11-27
AI Technical Summary
The existing oleracycin pharmaceutical wastewater treatment process has problems such as high energy consumption, additional carbon source dependence and unstable water quality, which is difficult to meet the requirements of water pollutant emission standards for fermented pharmaceutical industry.
The integrated short-range nitration coupled post-denitrification reinforcement sequence batch reactor is adopted to achieve deep denitrification without additive carbon sources through the operation mode of anaerobic → aerobic → hypoxia. Combined with mechanical stirring and aeration technology, pH and dissolved oxygen conditions are controlled.
It has achieved low energy consumption, rapid start-up and efficient nitrogen removal of oleracin pharmaceutical wastewater. The effluent meets the emission standards of GB21903-2008, reduces operating costs, and is suitable for sewage treatment with a P/C ratio of less than 0.1.
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Abstract
Description
Technical Field
[0001] The present application belongs to the field of biological wastewater treatment, and more specifically, particularly relates to an integrated short-range nitrification coupled with post-denitrification device and method for enhancing efficient denitrification of oxytetracycline pharmaceutical wastewater. Background Art
[0002] The sources of oxytetracycline pharmaceutical wastewater mainly include oxytetracycline base production and processing wastewater and workshop equipment cleaning wastewater. At present, the treatment methods for oxytetracycline pharmaceutical wastewater are mostly "coagulation and sedimentation + hydrolysis acidification + anaerobic UASB reactor + A / O tank + secondary sedimentation tank + advanced oxidation + flotation" process. However, because oxytetracycline pharmaceutical wastewater has the characteristics of high pollution load, strong toxicity, the presence of difficult biodegradable substances, rapid water quality changes and large water volume, the above-mentioned treatment process has fluctuations during treatment, resulting in the treated water quality cannot continuously and stably meet the limit requirements in GB21903-2008 "Fermentation Pharmaceutical Industry Water Pollutant Emission Standard", which has a certain impact on the normal production of pharmaceutical companies.
[0003] At the same time, in the original "coagulation and sedimentation + hydrolysis acidification + anaerobic UASB reactor + A / O tank + secondary sedimentation tank + advanced oxidation + flotation" process, the A / O tank treatment process has a high energy consumption, and the operating power consumption can reach 1.28kwh / t, and a large amount of external carbon source needs to be continuously added during the operation process to maintain the denitrification performance in the above treatment process.
[0004] Therefore, the applicant believes that it is urgent to find a low-carbon and efficient method for deep treatment of oxytetracycline pharmaceutical wastewater. Summary of the invention
[0005] The purpose of the present application is to provide an integrated short-range nitrification coupled post-denitrification enhanced device and method for efficient denitrification of oxytetracycline pharmaceutical wastewater, which can achieve biochemical denitrification of oxytetracycline pharmaceutical wastewater with simple operation, fast startup and low energy consumption without an external carbon source.
[0006] To achieve the above objectives, this application is implemented through the following technical solutions: The device described in the present application is an integrated short-range nitrification coupled post-denitrification device for enhancing the efficient denitrification of oxytetracycline pharmaceutical wastewater. The device includes an oxytetracycline wastewater inlet tank, an inlet pump, an inlet pipe, a sequencing batch reactor, a mechanical agitator, a pH and dissolved oxygen meter, a temperature control system, a sampling port, a drain valve, a mud discharge valve, a gas flow meter, an air compression pump, and an aeration head. The oxytetracycline wastewater inlet tank is connected to the feed port of the sequencing batch reactor through the inlet pump and the inlet pipe. An aeration head is also arranged inside the sequencing batch reactor, and the aeration head is connected to the air compression pump through a pump pipe and a gas flow meter. A mechanical agitator is also arranged in the sequencing batch reactor. A probe of a pH and dissolved oxygen meter is arranged in the sequencing batch reactor, and the pH and dissolved oxygen meter is connected to the probe located in the sequencing batch reactor through an electrical signal. The temperature control system is used to realize heating and insulation of the sequencing batch reactor. The sequencing batch reactor is provided with a sampling port, a drain valve, and a mud discharge valve from top to bottom.
[0007] The method for enhancing the efficient denitrification of oxytetracycline pharmaceutical wastewater by integrated short-range nitrification coupled with post-denitrification described in the present application includes adopting a sequencing batch operation mode, wherein the COD of oxytetracycline pharmaceutical wastewater entering the biochemical system is 750-950 mg / L, and NH4 + -N is 90~130mg / L, TN is 110~150mg / L, and the drainage ratio is 50%. The following steps are used for operation: Phase I: Take the aerobic tank activated sludge mixed liquor from the AO reactor that actually treats oxytetracycline pharmaceutical wastewater, decant the supernatant after sedimentation, and inject it into the sequencing batch reactor. After inoculation, control the sludge concentration in the sequencing batch reactor to be MLSS=3900mg / L; the sequencing batch reactor adopts the operation mode of anaerobic→aerobic→anoxic, in which the oxytetracycline pharmaceutical wastewater is injected into the anaerobic stage of the sequencing batch reactor through the water inlet pump for 10min, and at the same time, turn on the mechanical agitator of the sequencing batch reactor, and anaerobically stir the oxytetracycline pharmaceutical wastewater for 2 hours. h, the stirring speed of the mechanical stirrer is 70rmp~90rmp; in the aerobic stage of the sequencing batch reactor, the air compression pump is aerobically aerated through the pump pipe and the aeration head, the dissolved oxygen is 3.0mg / L~3.4mg / L, and the aeration time is 5h; in the anoxic stage of the sequencing batch reactor, the water is drained through the drain valve after stirring for 12 hours by the mechanical stirrer. This stage runs for 18 cycles, each cycle is 1 day; when the drainage of the sequencing batch reactor meets the ammonia nitrogen limit requirements in the water pollution discharge standard for fermentation pharmaceutical industry, the first stage ends; Phase II: The sequencing batch reactor adopts the anaerobic → aerobic → anoxic operation mode. In the anaerobic phase of the sequencing batch reactor, oxytetracycline pharmaceutical wastewater is injected through the water inlet pump. The injection time is 10 minutes. At the same time, the mechanical agitator is turned on for anaerobic stirring for 2 hours. The speed of the mechanical agitator is 70rmp~90rmp; in the aerobic phase of the sequencing batch reactor, the air compression pump is aerobically aerated through the pump pipe and the aeration head, and the nitrification time is adjusted from 6h to 4.5h; the anoxic phase time of the sequencing batch reactor is 12h. After the anoxic phase is completed, the sequencing batch reactor is drained through the drain valve; when the drainage of the sequencing batch reactor meets the requirement that the nitrite accumulation rate in the aerobic phase is stably higher than 80%, Phase II ends; Phase III: The sequencing batch reactor adopts the anaerobic → aerobic → anoxic operation mode. In the anaerobic stage of the sequencing batch reactor, oxytetracycline pharmaceutical wastewater is injected through the water inlet pump. The injection time is 10 minutes. At the same time, the mechanical agitator is turned on for anaerobic stirring for 2 hours, and the speed is 70rmp~90rmp; in the aerobic stage of the sequencing batch reactor, the air compression pump is aerobically aerated through the pump pipe and the aeration head, and the nitrification time is adjusted from 6 hours to 4.5 hours; in the anoxic stage of the sequencing batch reactor, the time is 13 hours. After the anoxic stage is completed, the sequencing batch reactor is drained through the drain valve; the drainage in this stage has been stable and met the standards for a long time, and the treatment effect is good; Phase IV: The sequencing batch reactor adopts the anaerobic → aerobic → anoxic operation mode. In the anaerobic stage of the sequencing batch reactor, oxytetracycline pharmaceutical wastewater is injected through the water inlet pump for 10 minutes. At the same time, the mechanical agitator is turned on for anaerobic stirring for 3 hours, and the speed is 70rmp~90rmp; in the aerobic stage of the sequencing batch reactor, the air compression pump is aerobically aerated through the pump pipe and the aeration head, and the nitrification time does not exceed 4.5 hours; in the anoxic stage of the sequencing batch reactor, the time is 13 hours. After the anoxic stage is completed, the sequencing batch reactor is drained through the drain valve; the operation cycle of this stage is 37 cycles, each cycle is 1 day; in the later stage of this stage, the total nitrogen in the effluent is stably maintained below 15mg / L, which meets the discharge standard of fermentation pharmaceutical wastewater, and Phase IV ends.
[0008] As one of the preferred technical solutions of the present application, the drainage volume and water inlet volume of the sequencing batch reactor are 50% of the total volume of sewage in the sequencing batch reactor.
[0009] Compared with the prior art, the beneficial effects of this application are: 1. In view of the characteristics of high organic matter content, high ammonia nitrogen, and low phosphorus (P) to carbon (C) ratio (P / C < 0.1) of oxytetracycline biopharmaceutical wastewater, it is difficult for the traditional SBR method to deeply denitrify oxytetracycline biopharmaceutical wastewater without an external carbon source. The "anaerobic → aerobic → anoxic" operation mode of the sequencing batch reactor adopted in this application realizes SBR post-denitrification denitrification, and can enrich glycogenolysis bacteria (GAO) under long-term domestication, and utilize glycogenolysis of glycogenolysis bacteria in the anaerobic section to convert volatile lipids in water into The anaerobic stage converts the VFA into glycogen, and the remaining PHA and glycogen are used as carbon sources for denitrification in the anoxic stage, so that the effluent of the sequencing batch reactor can meet the limit requirements of GB21903-2008 "Water Pollutant Emission Standard for Fermentation Pharmaceutical Industry" and TN <15mg / L. The anaerobic stage can store some biodegradable organic matter in the form of PHA in the cell body, reducing the amount of aeration required for the removal of organic matter in the aerobic stage. The anoxic stage does not require an external carbon source, which greatly reduces the operating cost.
[0010] 2. This application has the characteristics of fast startup, no external carbon source, good denitrification effect, simple operation and low cost. It is suitable for treating sewage and wastewater with a P / C ratio of less than 0.1 and low P content, and is particularly suitable for the denitrification treatment of oxytetracycline biopharmaceutical wastewater. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the device for enhancing the efficient denitrification of oxytetracycline pharmaceutical wastewater by integrated short-range nitrification coupled with post-denitrification as described in the present application.
[0012] Figure 2 It is the removal effect of COD and TN under long-term operation.
[0013] Figure 3 This is a typical cycle COD and nitrogen removal effect.
[0014] In the figure: 1. Oxytetracycline wastewater inlet tank; 2. Inlet pump; 3. Inlet pipe; 4. Sequencing batch reactor; 5. Mechanical agitator; 6. pH and dissolved oxygen meter; 7. Temperature control system; 8. Sampling port; 9. Drain valve; 10. Mud discharge valve; 11. Gas flow meter; 12. Air compression pump; 13. Aeration head. DETAILED DESCRIPTION
[0015] The technical solution described in this application is further described below in conjunction with the accompanying drawings and embodiments.
[0016] Example 1
[0017] See also Figure 1An integrated short-range nitrification coupled post-denitrification device for enhancing the efficient denitrification of oxytetracycline pharmaceutical wastewater comprises an oxytetracycline wastewater inlet tank 1, an inlet pump 2, an inlet pipe 3, a sequencing batch reactor 4, a mechanical agitator 5, a pH and dissolved oxygen meter 6, a temperature control system 7, a sampling port 8, a drain valve 9, a mud valve 10, a gas flow meter 11, an air compression pump 12, and an aeration head 13, wherein the oxytetracycline wastewater inlet tank 1 delivers the oxytetracycline biopharmaceutical wastewater into the sequencing batch reactor 4 through the inlet pipe 3 under the action of the inlet pump 2.
[0018] The sequencing batch reactor 4 is provided with a mechanical agitator 5, which has a driving mechanism and a stirring mechanism. The stirring mechanism is located inside the sequencing batch reactor 4 and is driven by the driving mechanism to achieve stirring of the oxytetracycline biopharmaceutical wastewater inside the sequencing batch reactor 4.
[0019] The pH and dissolved oxygen meter 6 has a probe extending into the sequencing batch reactor 4 . The probe is connected to the pH and dissolved oxygen meter 6 via an electrical signal to measure the pH and dissolved oxygen of the liquid inside the sequencing batch reactor 4 .
[0020] The temperature control system 7 can achieve heating and heat preservation of the liquid inside the sequencing batch reactor 4 .
[0021] The sequencing batch reactor 4 is also provided with a sampling port 8, a drainage valve 9, and a mud discharge valve 10, wherein the sampling port 8, the drainage valve 9, and the mud discharge valve 10 are arranged in sequence from top to bottom.
[0022] An aeration head 13 is also provided inside the sequencing batch reactor 4. The aeration head 13 is connected to an air compression pump 12 via a pump pipe and a gas flow meter 11. The air compression pump 12 can deliver required gas to the aeration head 13. The gas flow meter 11 can measure the gas pumped by the air compression pump 12.
[0023] Example 2
[0024] The integrated short-range nitrification coupled with post-denitrification method for enhancing the efficient denitrification of oxytetracycline pharmaceutical wastewater includes the use of a sequencing batch operation mode, the COD of the influent oxytetracycline pharmaceutical wastewater is 750~950mg / L, NH4 + -N is 90~130mg / L, TN is 110~150mg / L, the inlet volume and outlet volume of the sequencing batch reactor 4 should not exceed 50% of the total volume of sewage in the sequencing batch reactor 4, and the following steps are adopted for operation: Phase I: Take the aerobic tank activated sludge mixed liquor from the actual AO reactor for treating oxytetracycline pharmaceutical wastewater, decant the supernatant after sedimentation, and inject it into the sequencing batch reactor 4. After inoculation, control the sludge concentration in the sequencing batch reactor 4 to be MLSS=3900mg / L; the sequencing batch reactor 4 adopts the operation mode of anaerobic→aerobic→anoxic, wherein the oxytetracycline pharmaceutical wastewater is injected into the anaerobic stage of the sequencing batch reactor 4 through the water inlet pump 2 for 10min, and at the same time, the mechanical stirrer 5 of the sequencing batch reactor 4 is turned on, and the oxytetracycline pharmaceutical wastewater is anaerobically stirred for 2h by the mechanical stirrer 5. , the stirring speed of the mechanical stirrer 5 is 70rmp~90rmp; in the aerobic stage of the sequencing batch reactor 4, the air compression pump 12 is aerobically aerated through the pump pipe and the aeration head 13, the dissolved oxygen is 3.0mg / L~3.4mg / L, and the aeration time is 5h; in the anoxic stage of the sequencing batch reactor 4, the water is stirred for 12 hours by the mechanical stirrer 5 and then drained through the drain valve 9. This stage runs for 18 cycles, each cycle is 1 day; when the drainage of the sequencing batch reactor 4 meets the ammonia nitrogen limit requirements in the water pollution discharge standard for fermentation pharmaceutical industries, the first stage ends; Phase II: The sequencing batch reactor 4 adopts the anaerobic → aerobic → anoxic operation mode. In the anaerobic stage of the sequencing batch reactor 4, oxytetracycline pharmaceutical wastewater is injected through the water inlet pump 2, and the injection time is 10 minutes. At the same time, the mechanical stirrer 5 is turned on for anaerobic stirring for 2 hours, and the speed of the mechanical stirrer 5 is 70rmp~90rmp; in the aerobic stage of the sequencing batch reactor 4, the air compression pump 12 is aerobically aerated through the pump pipe and the aeration head 13, and the nitrification time is adjusted from 6 hours to 4.5 hours; the anoxic stage time of the sequencing batch reactor 4 is 12 hours. After the anoxic stage is completed, the sequencing batch reactor 4 is drained through the drain valve 9; when the drainage of the sequencing batch reactor 4 meets the aerobic stage nitrite accumulation rate is stably higher than 80%, Phase II ends; Phase III: The sequencing batch reactor 4 adopts the anaerobic → aerobic → anoxic operation mode. In the anaerobic stage of the sequencing batch reactor 4, oxytetracycline pharmaceutical wastewater is injected through the water inlet pump 2, and the injection time is 10 minutes. At the same time, the mechanical stirrer 5 is turned on for anaerobic stirring for 2 hours, and the speed is 70rmp~90rmp; in the aerobic stage of the sequencing batch reactor 4, the air compression pump 12 is aerobically aerated through the pump pipe and the aeration head 13, and the nitrification time is adjusted from 6 hours to 4.5 hours; in the anoxic stage of the sequencing batch reactor 4, the time is 13 hours. After the anoxic stage is completed, the sequencing batch reactor 4 is drained through the drain valve 9; the drainage in this stage is stable and meets the standards for a long time, and the treatment effect is good; Phase IV: The sequencing batch reactor 4 adopts the anaerobic → aerobic → anoxic operation mode. In the anaerobic stage of the sequencing batch reactor 4, oxytetracycline pharmaceutical wastewater is injected through the water inlet pump 2 for 10 minutes. At the same time, the mechanical stirrer 5 is turned on for anaerobic stirring for 3 hours, and the rotation speed is 70rmp~90rmp; in the aerobic stage of the sequencing batch reactor 4, the air compression pump 12 aerobically aerates through the pump pipe and the aeration head 13, and the nitrification time does not exceed 4.5 hours; in the anoxic stage of the sequencing batch reactor 4, the time is 13 hours. After the anoxic stage is completed, the sequencing batch reactor 4 is drained through the drain valve 9; the operation cycle of this stage is 37 cycles, each cycle is 1 day; in the later stage of this stage, the total nitrogen in the effluent is stably maintained below 15mg / L, which meets the discharge standard for fermentation pharmaceutical wastewater, and Phase IV ends.
[0025] The drainage volume and water inlet volume of the sequencing batch reactor 4 are 50% of the total volume of sewage in the sequencing batch reactor 4.
[0026] Based on the above embodiments, see the attached Figure 2 And attached Figure 3 , using the device described in Example 1 and the method described in Example 2, a denitrification experiment was conducted on the actual oxytetracycline pharmaceutical wastewater. The effective volume of the SBR reactor used was 6L, the drainage ratio was 50%, and the pneumatic and operating results showed that the denitrification effect was stable. After 34 hours of acclimatization, the startup phase was completed and the stable operation lasted for 120 days. When the influent COD and NH4 + When the concentrations of -N and TN are 786mg / L, 106mg / L and 108mg / L respectively, the effluent COD and NH4 + -N and TN concentrations are 375 mg / L, 4 mg / L, and 11 mg / L, respectively. Figure 3 The removal rates of ammonia nitrogen and total nitrogen can reach 96.2% and 89.8%.
[0027] Finally, although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. An integrated short-range nitrification coupled with post-denitrification device for enhancing efficient nitrogen removal from oxytetracycline pharmaceutical wastewater, characterized by: The device comprises an oxytetracycline wastewater inlet water tank (1), an inlet pump (2), an inlet pipe (3), a sequencing batch reactor (4), a mechanical stirrer (5), a pH value and dissolved oxygen measuring instrument (6), a temperature control system (7), a sampling port (8), a drainage valve (9), a mud discharge valve (10), a gas flow meter (11), an air compression pump (12), and an aeration head (13), wherein the oxytetracycline wastewater inlet water tank (1) is connected to the feed port of the sequencing batch reactor (4) through the inlet pump (2) and the inlet pipe (3), and the interior of the sequencing batch reactor (4) is also provided with an aeration head (13). The gas head (13) is connected to the air compression pump (12) via a pump tube and a gas flow meter (13); a mechanical stirrer (5) is further provided in the sequencing batch reactor (4); a probe of a pH value and dissolved oxygen meter (6) is provided in the sequencing batch reactor (4); the pH value and dissolved oxygen meter is connected to the probe in the sequencing batch reactor (4) via an electrical signal; the temperature control system (7) is used to achieve heating and heat preservation of the sequencing batch reactor (4); and the sequencing batch reactor (4) is provided with a sampling port (8), a drainage valve (9), and a mud discharge valve (10) in order from top to bottom.
2. An integrated short-range nitrification coupled with post-denitrification method for enhancing efficient nitrogen removal from oxytetracycline pharmaceutical wastewater, characterized in that: Including the use of sequencing batch operation mode, the COD of oxytetracycline pharmaceutical wastewater entering the biochemical system is 750~950mg / L, NH4 + -N is 90~130mg / L, TN is 110~150mg / L, the drainage ratio of the sequencing batch reactor (4) is 50%, and the following steps are used for operation: Phase I: Take the aerobic tank activated sludge mixed liquor from the AO reactor that actually treats oxytetracycline pharmaceutical wastewater, decant the supernatant after sedimentation, and inject it into the sequencing batch reactor (4). After inoculation, the sludge concentration in the sequencing batch reactor (4) is controlled to be MLSS=3900mg / L; the sequencing batch reactor (4) adopts an anaerobic→aerobic→anoxic operation mode, wherein the oxytetracycline pharmaceutical wastewater is injected into the sequencing batch reactor (4) through the water inlet pump (2) for 10 minutes during the anaerobic stage, and the mechanical agitator (5) of the sequencing batch reactor (4) is turned on at the same time, and the oxytetracycline pharmaceutical wastewater is anaerobically stirred for 2 hours by the mechanical agitator (5). , the stirring speed of the mechanical stirrer (5) is 70 rpm to 90 rpm; in the aerobic stage of the sequencing batch reactor (4), the air compression pump (12) aerobically aerates through the pump pipe and the aeration head (13), the dissolved oxygen is 3.0 mg / L to 3.4 mg / L, and the aeration time is 5 hours; in the anoxic stage of the sequencing batch reactor (4), the mechanical stirrer (5) is used to stir for 12 hours and then the water is drained through the drain valve (9), and this stage runs for 18 cycles, each cycle being 1 day; when the drainage of the sequencing batch reactor (4) meets the ammonia nitrogen limit value requirements in the water pollution discharge standard for fermentation pharmaceutical industries, stage I ends; Phase II: The sequencing batch reactor (4) adopts an anaerobic → aerobic → anoxic operation mode. In the anaerobic phase of the sequencing batch reactor (4), oxytetracycline pharmaceutical wastewater is injected through the water inlet pump (2) for 10 minutes. At the same time, the mechanical stirrer (5) is turned on for anaerobic stirring for 2 hours. The speed of the mechanical stirrer (5) is 70 rpm to 90 rpm. In the aerobic phase of the sequencing batch reactor (4), the air compression pump (12) is aerobically aerated through the pump pipe and the aeration head (13). The nitrification time is adjusted from 6 hours to 4.5 hours. The anoxic phase time of the sequencing batch reactor (4) is 12 hours. After the anoxic phase is completed, the sequencing batch reactor (4) is drained through the drain valve (9). When the drainage of the sequencing batch reactor (4) satisfies the requirement that the nitrite accumulation rate in the aerobic phase is stably higher than 80%, Phase II ends. Phase III: The sequencing batch reactor (4) adopts the anaerobic → aerobic → anoxic operation mode. In the anaerobic phase of the sequencing batch reactor (4), oxytetracycline pharmaceutical wastewater is injected through the water inlet pump (2) for 10 minutes. At the same time, the mechanical stirrer (5) is turned on for anaerobic stirring for 2 hours at a speed of 70 rpm to 90 rpm. In the aerobic phase of the sequencing batch reactor (4), the air compression pump (12) is aerobically aerated through the pump pipe and the aeration head (13), and the nitrification time is adjusted from 6 hours to 4.5 hours. In the anoxic phase of the sequencing batch reactor (4), the time is 13 hours. After the anoxic phase is completed, the sequencing batch reactor (4) is drained through the drain valve (9). The drainage in this phase meets the standard stably for a long time, and the treatment effect is good. Phase IV: The sequencing batch reactor (4) adopts an anaerobic → aerobic → anoxic operation mode. In the anaerobic phase of the sequencing batch reactor (4), oxytetracycline pharmaceutical wastewater is injected through the water inlet pump (2) for 10 minutes. At the same time, the mechanical stirrer (5) is turned on for anaerobic stirring for 3 hours at a speed of 70 rpm to 90 rpm. In the aerobic phase of the sequencing batch reactor (4), the air compressor pump (12) aerobically aerates through the pump pipe and the aeration head (13), and the nitrification time does not exceed 4.5 hours. In the anoxic phase of the sequencing batch reactor (4), the time is 13 hours. After the anoxic phase is completed, the sequencing batch reactor (4) drains water through the drain valve (9). The operation cycle of this phase is 37 cycles, each cycle is 1 day. In the later stage of this phase, the total nitrogen in the effluent is stably maintained below 15 mg / L, which meets the discharge standard for fermentation pharmaceutical wastewater, and Phase IV ends.
3. The method for enhancing efficient denitrification of oxytetracycline pharmaceutical wastewater by integrated short-range nitrification coupled with post-denitrification according to claim 2 is characterized in that: The drainage volume and water inlet volume of the sequencing batch reactor (4) are 50% of the total volume of sewage in the sequencing batch reactor (4).
Citation Information
Patent Citations
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