CN108408897B - Integrated short-cut nitrification anaerobic ammonia oxidation and phosphorus removal intermittent aeration real-time control method - Google Patents
Integrated short-cut nitrification anaerobic ammonia oxidation and phosphorus removal intermittent aeration real-time control method Download PDFInfo
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Abstract
An integrated short-cut nitrification anaerobic ammonia oxidation and phosphorus removal intermittent aeration real-time control method belongs to the field of biological sewage treatment. 1. Pumping primary domestic sewage into the integrated reactor for 2, periodically carrying out anoxic stirring for 22min and then carrying out anoxic aeration for 8min in the intermittent aeration process, wherein the dissolved oxygen is 0.8-1.2mg/L, and carrying out intermittent aeration for 11 periods; 3. and (4) discharging water after precipitation, wherein the hydraulic retention time is 6h per cycle, and the age of floc sludge is 30-50 d. The method utilizes the difference of the sensitivity of Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB) to intermittent aeration, so that the AOB is in the dominant strain position; the control of the hypoxia aeration time and the sludge age further realizes the long-term maintenance of the AOB dominant strain status. Meanwhile, as the primary domestic sewage is directly inoculated, the period of intermittent aeration is long, and zero addition of an external carbon source and deep nitrogen and phosphorus removal are realized. The method has the advantages of accurate control, zero carbon source addition, simultaneous phosphorus removal by shortcut nitrification and anaerobic ammonia oxidation and the like.
Description
Technical Field
The invention relates to an integrated short-cut nitrification anaerobic ammonia oxidation and phosphorus removal intermittent aeration real-time control method, and belongs to the technical field of biological sewage treatment.
Background
Because the current water eutrophication phenomenon is serious, a plurality of sewage treatment plants are improved in standard, and the index of total nitrogen and total phosphorus of effluent is more strict. Therefore, an energy-saving and efficient denitrification and dephosphorization process is urgently needed to be put into the upgrading and transformation project of the sewage plant. At present, most sewage treatment plants operate according to the traditional AAO or oxidation ditch mode, the total nitrogen and total phosphorus in effluent hardly reach the standard, and the treatment method also faces a plurality of obstacles such as low temperature, low energy, large water quantity and the like of urban domestic sewage. Meanwhile, sewage treatment belongs to the energy-intensive industry, on one hand, the high energy consumption causes the sewage treatment cost to be increased, the current energy crisis of China is aggravated to a certain extent, and on the other hand, the high treatment cost caused by the high energy consumption causes some small and medium-sized sewage treatment plants to be difficult to operate normally, and the emission reduction benefit of the sewage treatment plants cannot be brought into full play normally. Therefore, the efficient denitrification and dephosphorization by fully utilizing the carbon source in the municipal domestic sewage without adding the carbon source is an aim pursued by the sewage treatment field.
The current deep denitrification technology mainly comprises the coupling of processes such as partial nitrification and denitrification, synchronous nitrification and denitrification, anaerobic ammonia oxidation and the like. Nitrifying bacteria are a group of energy-producing nutritional bacteria, mainly including Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB), which can convert NH4 +Conversion to NO2 -、NO2 -Conversion to NO3 -Plays an irreplaceable role in the denitrification process of the sewage. The short-cut denitrification technology is characterized in that the biological nitrification process is controlled in the ammonia oxidation stage, and then denitrification is directly carried out, so that the purposes of saving energy and reducing consumption are achieved. The short-cut nitrification is the key of the short-cut denitrification technology, and the key for realizing the short-cut nitrification is the enrichment of AOB and the inhibition and elutriation of NOB.
At present, methods for realizing short-cut nitrification mainly comprise high temperature, high pH value, high concentration Free Ammonia (FA) and high concentration Free Nitrous Acid (FNA), low Dissolved Oxygen (DO), short sludge age (SRT), addition of an inhibitor and the like. The short-range nitrification implementation modes are that an environment suitable for AOB growth and NOB growth inhibition or slowing down is created in the system operation process, and a short-range denitrification system with AOB population abundance being larger than NOB population abundance is gradually formed. However, urban domestic sewage does not always have the NOB control environment such as high temperature, high pH value, high FA and FNA inhibition, and the like, and the whole-course nitrified sludge in the main stream can be gradually replaced by short-course nitrified sludge only by means of side treatment, biological enhancement and the like. Experiments show that the short-range nitrification is difficult to stably realize by independently controlling the low dissolved oxygen or the short sludge age. If the system is started quickly by a bioaugmentation method before stable operation, the abundance of the shortcut nitrification and anaerobic ammonium oxidation bacteria is improved; after the start-up operation, the difference in activity and quantity of AOB and NOB populations can be stably controlled through the real-time control of intermittent aeration, so that the AOB always has advantages, and a brand-new way is provided for deep denitrification of low-energy and high-water-yield urban domestic sewage.
The current new biological treatment technology in deep phosphorus removal mainly comprises Enhanced Biological Phosphorus Removal (EBPR), denitrifying phosphorus removal and the like. The enhanced biological phosphorus removal mainly utilizes the phosphorus-accumulating bacteria which can absorb a large amount of Phosphate (PO) in an aerobic state4 3-) Self nucleic acid and ATP are synthesized, and polyphosphate particles (i.e. heteroparticles) capable of absorbing excessive phosphorus in a reverse concentration gradient and synthesizing stored energy are synthesized in vivo for endogenous respiration, and the bacteria are called phosphorus accumulating bacteria. The phosphorus-accumulating bacteria can release Phosphate (PO) in anaerobic condition4 3-) In vitro, anaerobic, anoxic and aerobic environment can be created, phosphorus-accumulating bacteria firstly release phosphorus anaerobically in phosphorus-containing sewage (wastewater), then absorb phosphorus sufficiently and excessively under aerobic condition, and then remove partial phosphorus from the sewage (wastewater) through sludge discharge. Denitrifying phosphorus removal mainly utilizes denitrifying phosphorus accumulating bacteria (DNPAOs) to fully absorb phosphorus by using nitrate nitrogen or nitrite nitrogen as an electron donor in an anoxic environment, and then partial phosphorus is removed from sewage and wastewater through sludge discharge.
The current coupling process for deep denitrification and dephosphorization is also many, such as AAO-BAF, AAO-BCO, A2And N and the like. The nitrogen and phosphorus removal means of the method solves the competition between sludge age and carbon source between the nitrifying bacteria and the phosphorus accumulating bacteria, is beneficial to the phosphorus accumulating bacteria, and the nitrifying bacteria respectively become dominant strains in a double-sludge system to realize deep nitrogen and phosphorus removal. The intermittent aeration real-time control method and the screening means are applied to the integrated process of shortcut nitrification, anaerobic ammonia oxidation and phosphorus removal, so that the ecological environment created by the intermittent aeration real-time control method can be utilized on the basis of the autotrophic nitrogen removal technology, the carbon source in the original urban domestic sewage is fully utilized, and the efficient and energy-saving deep nitrogen and phosphorus removal is realized.
Disclosure of Invention
The invention aims to provide an integrated intermittent aeration mode real-time control method for shortcut nitrification-anaerobic ammonia oxidation and phosphorus removal. The invention utilizes the difference of the attenuation rates of the ammonia oxidizing bacteria and the nitrite oxidizing bacteria in the intermittent aeration mode and the difference of the environmental adaptability in the recovery operation process, adopts the intermittent aeration treatment mode for the activated sludge, and quickly enlarges the activity difference between the AOB and the NOB; meanwhile, the lack of aerobic environment created by intermittent aeration, the organic carbon source in the original biological sewage and the electron donor generated in the process of shortcut nitrification anaerobic ammonium oxidation autotrophic nitrogen removal are utilized to realize deep nitrogen and phosphorus removal. The invention starts the integrated reactor by a biological strengthening means, and is assisted by an intermittent aeration real-time control means and a sludge age control means, thereby rapidly realizing the deep denitrification and dephosphorization of the urban domestic sewage.
An intermittent aeration real-time control method for integrated shortcut nitrification anaerobic ammonia oxidation and phosphorus removal comprises a municipal sewage raw water tank (1), an integrated reactor (2), a computer (3), a programmable process controller (4) and an effluent water tank (5).
The urban sewage raw water tank (1) is provided with a raw water tank overflow pipe (1.1) and a raw water tank emptying valve (1.2); the urban domestic sewage is connected with the integrated reactor (2) through a water inlet pump (1.3); the integrated reactor (2) is provided with an air compressor (2.1), an aeration electromagnetic valve (2.2), a gas rotameter (2.3), a stirrer (2.4), a pH and DO tester (2.5), a pH and DO probe (2.6), a water outlet valve (2.7), an emptying valve (2.8) and a bonded sand block aeration head (2.9); the real-time control system is provided with a computer (3), a programmable process controller (4), a signal converter DA conversion interface (4.1), a signal converter AD conversion interface (4.2), a water inlet relay (4.3), a stirring relay (4.4), an aeration relay (4.5) and a water drainage relay (4.6); wherein, a signal AD conversion interface (4.2) on the programmable process controller (4) is connected with the computer (3) through a cable, and converts the analog signal of the sensor into a digital signal and transmits the digital signal to the computer (3); the computer (3) is connected with the programmable process controller (4) through a signal converter DA conversion interface (4.1) and transmits the digital instruction of the computer (3) to the programmable process controller (4); the stirrer relay (4.4) is connected with the stirrer (2.4); the pH/DO data signal interface (2.5) is connected with the computer (3); the water inlet relay (4.3) is connected with the water inlet pump (1.3); the aeration relay (4.5) is connected with the sand-bonded block aeration head (2.8); the water drainage relay (4.6) is connected with the water outlet valve (2.7); the precipitated effluent is discharged into an effluent water tank (5) through an effluent valve (2.7), which comprises an effluent water tank overflow port (5.1) and an effluent water tank emptying valve (5.2).
The integrated intermittent aeration real-time control method for shortcut nitrification anaerobic ammonia oxidation and phosphorus removal is characterized by comprising the following steps of:
1) a starting stage:
the integrated reactor (2) is inoculated to treat the shortcut nitrification sludge which stably runs in the domestic sewage reactor, and the anaerobic ammonia oxidation granular sludge is taken from the anaerobic ammonia oxidation reactor (UASB) which stably runs as seed sludge to be inoculated, wherein the mass ratio of the shortcut nitrification sludge to the anaerobic ammonia oxidation granular sludge in the reactor is 4:1, and the total sludge concentration is controlled to be 4000-5000 mg/L. After the seed sludge is inoculated in the integrated reactor (2), the aeration is continuously carried out for 1 to 3 days at the aeration rate of 1.2 to 1.5 mg/L.
2) And (3) an operation stage:
the integrated reactor (2) is provided with an air compressor (2.1) for aeration, and a mechanical stirring paddle (2.4) is used for mixing and stirring in the water inlet and reaction stages. The integrated reactor had a hydraulic retention time of 6h and was operated for 4 cycles per day. The raw domestic sewage is pumped into the integrated reactor (2) by a real-time control system to control a water inlet pump (1.3) at the beginning of each period, and the aeration rate is adjusted by a gas rotameter (2.3), so that the dissolved oxygen concentration of the integrated reactor is controlled to be 0.8-1.2 mg/L. The intermittent aeration is controlled by a real-time control system, the period is 6 hours per cycle, the water inflow is 4min, the intermittent aeration is 330min, the sedimentation is 22min, the water drainage is 4min, and the operation is 4 cycles per day. In the intermittent aeration stage, a real-time control system is adopted to intermittently adjust aeration, an air compressor (2.1) is alternately turned on or off, 11 periods of operating conditions of anoxic stirring for 22min and then anoxic aeration for 8min are provided, and the aeration amount is 0.8-1.2 mg/L. The effluent of the integrated reactor (2) is drained through a water outlet valve (2.7), and the drainage ratio is 50%. The integrated reactor (2) discharges floc sludge per cycle, and the floc sludge age is 30-50 days. The temperature in the integrated reactor (2) is controlled at 30-35 ℃ by a heating device.
3) And a screening and sludge discharging stage:
screening by using a 200-micron screen mesh, removing floc sludge, and adding the intercepted anaerobic ammonia oxidation granular sludge into the integrated reactor (2) at the end of the water inlet stage of each period.
The invention has the following advantages:
(1) the integrated intermittent aeration real-time control method for the shortcut nitrification anaerobic ammonia oxidation can accurately realize water inlet for 4min, intermittent aeration for 330min, precipitation for 22min and water outlet for 4 min.
(2) The invention can quickly enrich ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria in the integrated reactor, and realizes quick start of the system and good autotrophic denitrification efficiency. Meanwhile, the rapid accumulation of nitrite can be rapidly realized, and then the nitrite is used as a substrate for anaerobic ammonia oxidation reaction to perform autotrophic nitrogen removal. Because the phosphorus removal effect in the first few intermittent aeration periods consumes the organic components in the raw water, the autotrophic nitrogen removal process can be smoothly carried out, so that the anaerobic ammonia oxidizing bacteria can normally react under the condition of high C/N ratio of inlet water.
(3) The invention can create an ecological environment beneficial to dephosphorization by an intermittent aeration real-time control method. Nitrate nitrogen generated by anaerobic ammonia oxidation reaction is used as an electron donor, phosphorus can be removed by denitrifying phosphorus removal bacteria in an anoxic stage, and 11% of nitrate nitrogen generated by anaerobic ammonia oxidation reaction can be removed, so that deep denitrification is realized. Because anaerobic ammoxidation reaction and the nonuniformity of anoxic stirring occur in the anoxic process, an anaerobic environment suitable for storing the internal carbon source of the phosphorus accumulating bacteria is created; the intermittent aeration operation mode also gives the biological driving force of anaerobic phosphorus release and aerobic phosphorus absorption of the phosphorus accumulating bacteria, so that the phosphorus accumulating bacteria can efficiently remove phosphorus, and the phosphorus removal rate can reach more than 95 percent.
(4) Improve the sludge sedimentation performance. The phosphate-rich fine floc sludge helps to accelerate the sedimentation of the sludge in the sedimentation process and prevent the loss of ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria.
(5) The economic investment cost is low. The method does not need to change the original device and equipment and purchase other control instruments, and the main energy consumption sources are aeration and stirring.
The method is suitable for the newly-built SBR process or the SBR process needing upgrading and reconstruction, and can quickly realize the deep nitrogen and phosphorus removal of the municipal sewage.
Drawings
FIG. 1 is a schematic diagram of the structure of an apparatus of the present invention implemented in an integrated reactor;
in the figure 1, 1 is an urban sewage raw water tank, 1.1 is a raw water tank overflow pipe, 1.2 is a raw water tank emptying valve, and 1.3 is a water inlet pump; 2, an integrated reactor, 2.1, an air compressor, 2.2, an aeration electromagnetic valve, 2.3, a gas rotameter, 2.4, a stirrer, 2.5, a pH and DO tester, 2.6, a pH and DO probe, 2.7, a water outlet valve, 2.8, an emptying valve and 2.9, a sand-sticking block aeration head; 3 is a computer, 4 is a programmable process controller, 4.1 is a signal converter DA conversion interface, 4.2 is a signal converter AD conversion interface, 4.3 is a water inlet relay, 4.4 is a stirring relay, 4.5 is an aeration relay, and 4.6 is a water discharge relay; 5 is a water outlet tank, 5.1 is an overflow port of the water outlet tank, and 5.2 is an emptying valve of the water outlet tank.
FIG. 2 is a flow chart of a method for controlling intermittent aeration in real time according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and technical solutions, but the present invention is not limited to the following examples.
The process of the present invention is further described below with reference to specific examples:
the experiment adopts the domestic sewage of the family district of Beijing university of industry as the raw water, and the specific water quality is as follows: COD concentration is 120-4 +-N concentration 58-87mg/L, NO2 --N≤2mg/L，NO3 -N is less than or equal to 1.5 mg/L. The experimental system is shown in figure 1, each reactor is made of organic glass, and the total volume of the integrated reactor is 11L, wherein the effective volume is 10L.
The device comprises a city sewage raw water tank (1), an integrated reactor (2), a computer (3), a programmable process controller (4) and an effluent water tank (5).
The urban sewage raw water tank (1) is provided with a raw water tank overflow pipe (1.1) and a raw water tank emptying valve (1.2); the urban domestic sewage is connected with the integrated reactor (2) through a water inlet pump (1.3); the integrated reactor (2) is provided with an air compressor (2.1), an aeration electromagnetic valve (2.2), a gas rotameter (2.3), a stirrer (2.4), a pH and DO tester (2.5), a pH and DO probe (2.6), a water outlet valve (2.7), an emptying valve (2.8) and a bonded sand block aeration head (2.9); the real-time control system is provided with a computer (3), a programmable process controller (4), a signal converter DA conversion interface (4.1), a signal converter AD conversion interface (4.2), a water inlet relay (4.3), a stirring relay (4.4), an aeration relay (4.5) and a water drainage relay (4.6); wherein, a signal AD conversion interface (4.2) on the programmable process controller (4) is connected with the computer (3) through a cable, and converts the analog signal of the sensor into a digital signal and transmits the digital signal to the computer (3); the computer (3) is connected with the programmable process controller (4) through a signal converter DA conversion interface (4.1) and transmits the digital instruction of the computer (3) to the programmable process controller (4); the stirrer relay (4.4) is connected with the stirrer (2.4); the pH/DO data signal interface (2.5) is connected with the computer (3); the water inlet relay (4.3) is connected with the water inlet pump (1.3); the aeration relay (4.5) is connected with the sand-bonded block aeration head (2.8); the water drainage relay (4.6) is connected with the water outlet valve (2.7); the precipitated effluent is discharged into an effluent water tank (5) through an effluent valve (2.7), which comprises an effluent water tank overflow port (5.1) and an effluent water tank emptying valve (5.2).
The specific operation is as follows:
1) a starting stage:
the integrated reactor (2) is inoculated to treat the shortcut nitrification sludge which stably runs in the domestic sewage reactor, and the anaerobic ammonia oxidation granular sludge is taken from the anaerobic ammonia oxidation reactor (UASB) which stably runs as seed sludge to be inoculated, wherein the mass ratio of the shortcut nitrification sludge to the anaerobic ammonia oxidation granular sludge in the reactor is 4:1, and the total sludge concentration is controlled to be 4000-5000 mg/L. After the seed sludge is inoculated in the integrated reactor (2), the aeration is continuously carried out for 1 to 3 days at the aeration rate of 1.2 to 1.5 mg/L.
2) And (3) an operation stage:
the integrated reactor (2) is provided with an air compressor (2.1) for aeration, and a mechanical stirring paddle (2.4) is used for mixing and stirring in the water inlet and reaction stages. The integrated reactor had a hydraulic retention time of 6h and was operated for 4 cycles per day. The raw domestic sewage is pumped into the integrated reactor (2) by a real-time control system to control a water inlet pump (1.3) at the beginning of each period, and the aeration rate is adjusted by a gas rotameter (2.3), so that the dissolved oxygen concentration of the integrated reactor is controlled to be 0.8-1.2 mg/L. The intermittent aeration is controlled by a real-time control system, the period is 6 hours per cycle, the water inflow is 4min, the intermittent aeration is 330min, the sedimentation is 22min, the water drainage is 4min, and the operation is 4 cycles per day. In the intermittent aeration stage, a real-time control system is adopted to intermittently adjust aeration, an air compressor (2.1) is alternately turned on or off, 11 periods of operating conditions of anoxic stirring for 22min and then anoxic aeration for 8min are provided, and the aeration amount is 0.8-1.2 mg/L. The effluent of the integrated reactor (2) is drained through a water outlet valve (2.7), and the drainage ratio is 50%. The integrated reactor (2) discharges floc sludge per cycle, and the floc sludge age is 30-50 days. The temperature in the integrated reactor (2) is controlled at 30-35 ℃ by a heating device.
3) And a screening and sludge discharging stage:
screening by using a 200-micron screen mesh, removing floc sludge, and adding the intercepted anaerobic ammonia oxidation granular sludge into the integrated reactor (2) at the end of the water inlet stage of each period.
Furthermore, after the integrated reactor runs stably, the aeration amount is adjusted in time according to the ammonia nitrogen concentration and the total phosphorus content in the effluent, so that the over-aeration phenomenon is prevented.
Claims (2)
1. The intermittent aeration real-time control method for integrated shortcut nitrification anaerobic ammonia oxidation and phosphorus removal is characterized in that the used device comprises a municipal sewage raw water tank (1), an integrated reactor (2), a computer (3), a programmable process controller (4) and a water outlet tank (5);
the urban sewage raw water tank (1) is provided with a raw water tank overflow pipe (1.1) and a raw water tank emptying valve (1.2); the urban domestic sewage is connected with the integrated reactor (2) through a water inlet pump (1.3); the integrated reactor (2) is provided with an air compressor (2.1), an aeration electromagnetic valve (2.2), a gas rotameter (2.3), a stirrer (2.4), a pH and DO tester (2.5), a pH and DO probe (2.6), a water outlet valve (2.7), an emptying valve (2.8) and a bonded sand block aeration head (2.9); the real-time control system is provided with a computer (3), a programmable process controller (4), a signal converter DA conversion interface (4.1), a signal converter AD conversion interface (4.2), a water inlet relay (4.3), a stirring relay (4.4), an aeration relay (4.5) and a water drainage relay (4.6); wherein, a signal AD conversion interface (4.2) on the programmable process controller (4) is connected with the computer (3) through a cable, and converts the analog signal of the sensor into a digital signal and transmits the digital signal to the computer (3); the computer (3) is connected with the programmable process controller (4) through a signal converter DA conversion interface (4.1) and transmits the digital instruction of the computer (3) to the programmable process controller (4); the stirrer relay (4.4) is connected with the stirrer (2.4); the pH/DO data signal interface (2.5) is connected with the computer (3); the water inlet relay (4.3) is connected with the water inlet pump (1.3); the aeration relay (4.5) is connected with the sand-bonded block aeration head (2.8); the water drainage relay (4.6) is connected with the water outlet valve (2.7); the precipitated effluent is discharged into an effluent water tank (5) through an effluent valve (2.7), and the effluent water tank comprises an effluent water tank overflow port (5.1) and an effluent water tank emptying valve (5.2);
the method comprises the following steps:
1) a starting stage:
the integrated reactor (2) is used for inoculating and treating the shortcut nitrification sludge which stably runs in the domestic sewage reactor, and taking the anaerobic ammonia oxidation granular sludge from the anaerobic ammonia oxidation reactor which stably runs as seed sludge for inoculation, wherein the mass ratio of the shortcut nitrification sludge to the anaerobic ammonia oxidation granular sludge in the reactor is 4:1, and the total sludge concentration is controlled to be 4000-5000 mg/L; after the seed sludge is inoculated in the integrated reactor (2), continuously aerating for 1-3 days at the aeration rate of 1.2-1.5 mg/L;
2) and (3) an operation stage:
the integrated reactor (2) is provided with an air compressor (2.1) for aeration, and a mechanical stirring paddle (2.4) is used for mixing and stirring in the water inlet and reaction stages; the hydraulic retention time of the integrated reactor is 6h, and the integrated reactor runs for 4 periods every day; the raw domestic sewage is pumped into the integrated reactor (2) by controlling a water inlet pump (1.3) through a real-time control system at the beginning of each period, and the aeration amount is adjusted through a gas rotameter (2.3), so that the dissolved oxygen concentration of the integrated reactor is controlled to be 0.8-1.2 mg/L; controlling intermittent aeration through a real-time control system, wherein each period is 6 hours, and comprises 4min water inlet, 330min intermittent aeration, 22min sedimentation and 4min water drainage, and the operation is carried out for 4 periods every day; in the intermittent aeration stage, a real-time control system is adopted to intermittently adjust aeration, an air compressor (2.1) is alternately turned on or off, 11 periods of operating conditions of anoxic stirring for 22min and then anoxic aeration for 8min are provided, and the aeration amount is 0.8-1.2 mg/L; the effluent of the integrated reactor (2) is drained through a water outlet valve (2.7), and the drainage ratio is 50 percent; the integrated reactor (2) discharges floc sludge per cycle, and the floc sludge age is 30-50 days; the temperature in the integrated reactor (2) is controlled at 30-35 ℃ by a heating device.
2. The method of claim 1, further comprising, after said step 2): screening by using a 200-micron screen mesh, removing floc sludge, and adding the intercepted anaerobic ammonia oxidation granular sludge into the integrated reactor (2) at the end of the water inlet stage of each period.
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| CN109650543B (en) * | 2019-02-18 | 2022-01-07 | 青岛大学 | SPNA integrated denitrification method for treating low-matrix wastewater under continuous flow condition |
| CN109824145B (en) * | 2019-03-06 | 2023-11-03 | 北京工业大学 | Device and method for rapidly realizing autotrophic denitrification of domestic sewage by regulating and controlling flora structure |
| CN110510738B (en) * | 2019-08-12 | 2022-02-01 | 欧基（上海）环保科技有限公司 | Aerobic denitrification and dephosphorization enhanced sewage treatment system and method |
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