CN113072179A - Sewage nitrogen and phosphorus removal device and method thereof - Google Patents
Sewage nitrogen and phosphorus removal device and method thereof Download PDFInfo
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- C02F3/308—Biological phosphorus removal
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention discloses a sewage denitrification and dephosphorization device, which comprises a water storage device, an anoxic tank communicated with the water storage device, a stirrer arranged in the anoxic tank, an aerobic tank, a membrane component arranged in the aerobic tank, an overflow pipe, a return pipe, a reflux pump arranged on the return pipe and a liquid pumping device, wherein the membrane component is arranged in the aerobic tank; the anaerobic tank is communicated with the aerobic tank through the overflow pipe, the aerobic tank is communicated with the anaerobic tank through the return pipe, the liquid pumping device is provided with a liquid pumping end and a liquid discharging end, the liquid pumping end of the liquid pumping device is positioned in the aerobic tank, and the membrane component is sleeved on the liquid pumping end of the liquid pumping device. The invention also discloses a sewage denitrification and dephosphorization method. The invention realizes the switching between anaerobic state and anoxic state of the anoxic tank by the intermittent standing and the intermittent reflux of the anoxic tank, greatly saves the power consumption, reduces the operation cost, and belongs to the technical field of biological wastewater treatment devices.
Description
Technical Field
The invention relates to the technical field of wastewater biological treatment devices, in particular to a sewage nitrogen and phosphorus removal device and a method thereof.
Background
Along with the gradual acceleration of the development of cities and the explosion of population, the total amount of urban wastewater discharge is increased day by day; meanwhile, due to the reduction of the quality of living environment and the increase of the demand of people for high quality living standard, the national setting of sewage discharge standard is becoming stricter. At present, most municipal sewage treatment plants in China mainly operate by traditional activated sludge methods such as A2O and AO, and the main problems are low carbon source, high ammonia nitrogen, high phosphorus and the like, so that the effluent quality is poor and even can not reach the standard. In the actual operation process of some water plants, a large amount of supplementary carbon sources are often needed to be added so as to enable the water quality of the effluent to reach the standard, but the strategy concept deviates from the strategy concept of sustainable development. In addition, the use of the secondary sedimentation tank greatly increases the floor area, resulting in increased capital cost; the uninterrupted operation of the treatment equipment of the sewage plant for a long time not only increases the equipment loss, but also increases the power consumption cost.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to: the invention provides a sewage nitrogen and phosphorus removal device and a method thereof, and realizes the switching of anaerobic and anoxic states of an anoxic tank by intermittent standing and intermittent reflux of the anoxic tank, thereby not only greatly saving the power consumption and reducing the operation cost, but also strengthening the carbon source utilization process and realizing more excellent and stable nitrogen and phosphorus removal performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a sewage denitrification and dephosphorization device comprises a water receiver, an anoxic tank communicated with the water receiver, a stirrer installed in the anoxic tank, an aerobic tank, a membrane module installed in the aerobic tank, an overflow pipe, a return pump installed on the return pipe and a liquid pumping device; the anaerobic tank is communicated with the aerobic tank through the overflow pipe, the aerobic tank is communicated with the anaerobic tank through the return pipe, the liquid pumping device is provided with a liquid pumping end and a liquid discharging end, the liquid pumping end of the liquid pumping device is positioned in the aerobic tank, and the membrane component is sleeved on the liquid pumping end of the liquid pumping device.
Further, the sewage nitrogen and phosphorus removal device also comprises an air pump, an air supply pipe connected with the output end of the air pump, and an aerator connected with the air supply pipe; the aerator is arranged in the aerobic tank.
Further, a gas flow meter is mounted on the gas supply pipe.
Further, the sewage denitrification and dephosphorization device also comprises a relay; the reflux pump and the stirrer are electrically connected with the relay.
Further, the sewage denitrification and dephosphorization device also comprises a first liquid level device for detecting the highest liquid level of the liquid in the aerobic tank and a second liquid level device for detecting the lowest liquid level of the liquid in the aerobic tank; the first liquid level device and the second liquid level device are electrically connected with the relay.
Further, the sewage nitrogen and phosphorus removal device also comprises a liquid inlet pipe and a liquid inlet pump arranged on the water inlet pipe; one end of the liquid inlet pipe is communicated with the water storage device, and the other end of the liquid inlet pipe is communicated with the anoxic tank.
Further, the liquid extractor comprises a liquid extracting pipe and a drainage pump arranged on the liquid extracting pipe; the liquid suction pipe is provided with a first end for draining water and a second end for pumping water, the second end of the liquid suction pipe is positioned in the aerobic tank, and the membrane component is sleeved on the second end of the liquid suction pipe.
Further, the sewage denitrification and dephosphorization device further comprises a pressure gauge arranged on the liquid pumping pipe, and the pressure gauge is positioned between the drainage pump and the second end of the liquid pumping pipe.
A method for removing nitrogen and phosphorus from sewage comprises the following steps:
the method comprises the following steps: preparing a water storage device, an anoxic tank provided with a stirrer, an aerobic tank provided with a membrane component, an overflow pipe provided with a reflux pump, a reflux pipe and a liquid pumping device;
step two: the water receiver is communicated with the anoxic tank, the anoxic tank and the aerobic tank form a circulation loop through the overflow pipe and the return pipe, and the membrane module is sleeved at the liquid pumping end of the liquid pumping device and is placed in the aerobic tank;
step three: taking sludge-water mixed liquor from a secondary sedimentation tank of a sewage treatment plant and placing the sludge-water mixed liquor in the liquid storage device;
step four: injecting the muddy water mixed liquor in the liquid reservoir into the anoxic tank, wherein the muddy water mixed liquor flows into the aerobic tank through the overflow pipe, and the liquid reservoir stops supplying the muddy water mixed liquor to the anoxic tank when the muddy water mixed liquor in the aerobic tank reaches a specified liquid level;
step five: starting the stirrer and the reflux pump at the same time for a period of time, then closing the stirrer and the reflux pump at the same time for a period of time, and continuously repeating the simultaneous starting and simultaneous closing processes of the stirrer and the reflux pump; and starting the liquid pumping device for draining water all the time, and restarting the liquid storage device to supply muddy water mixed liquid to the anoxic pond according to the drainage quantity.
Further, in the third step, the stirrer and the reflux pump are started for one hour at the same time, then closed for half an hour at the same time, and the processes that the stirrer and the reflux pump are started for one hour at the same time and the stirrer and the reflux pump are closed for half an hour at the same time are continuously repeated.
Compared with the prior art, the invention has the beneficial effects that: the stirrer and the reflux pump are controlled by the same relay, and circularly run in a mode of being opened for one hour and closed for half an hour, so that the anoxic tank can be intermittently stood and intermittently refluxed, the anaerobic and anoxic states of the anoxic tank are switched, the power consumption is greatly saved, the running cost is reduced, the carbon source utilization process is enhanced, and more excellent and stable denitrification and dephosphorization performances are realized. When the anoxic tank adopts the intermittent standing and intermittent backflow modes, the nitrogen content in the effluent of the device is lower than that of the continuous stirring and continuous backflow modes, the denitrification efficiency is improved by 15-35%, and meanwhile, the intermittent standing and intermittent backflow modes are adopted, so that the total phosphorus in the effluent is relatively lower, and the dephosphorization efficiency is improved by 10-30%.
Drawings
FIG. 1 is a schematic structural diagram of a sewage denitrification and dephosphorization apparatus.
In the figure, 1 is a water storage device, 2 is an anoxic tank, 3 is a stirrer, 4 is an aerobic tank, 5 is a membrane module, 6 is an overflow pipe, 7 is a return pipe, 8 is a return pump, 9 is a liquid pumping device, 10 is an air pump, 11 is an air supply pipe, 12 is an aerator, 13 is a gas flow meter, 14 is a relay, 15 is a first liquid level device, 16 is a second liquid level device, 17 is a liquid inlet pipe, 18 is a liquid inlet pump, 91 is a liquid pumping pipe, and 92 is a drainage pump.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For convenience of description, unless otherwise noted, the up-down direction described below coincides with the up-down direction of fig. 1 itself, and the left-right direction described below coincides with the left-right direction of fig. 1 itself.
As shown in fig. 1, the present embodiment provides a sewage nitrogen and phosphorus removal device, which includes a water storage device 1, an anoxic tank 2 communicated with the water storage device 1, a stirrer 3 installed in the anoxic tank 2, an aerobic tank 4, a membrane module 5 installed in the aerobic tank 4, an overflow pipe 6, a return pipe 7, a reflux pump 8 installed on the return pipe 7, and a liquid pumping device 9; the oxygen deficiency pond 2 is communicated with the aerobic pond 4 through the overflow pipe 6, the aerobic pond 4 is communicated with the oxygen deficiency pond 2 through the return pipe 7, and the oxygen deficiency pond 2, the overflow pipe 6, the aerobic pond 4 and the return pipe 7 are sequentially connected to form a circulation loop. The membrane module 5 is made of PVDF (polyvinylidene fluoride), and the membrane module 5 is used for replacing a sedimentation tank so as to realize sludge-water separation. The anoxic tank 2 is provided with a stirrer 3 for stirring the mud-water mixture in the anoxic tank 2 to achieve uniform mixing of the sludge. The top of the anoxic tank 2 is communicated with the aerobic tank 4 through an overflow pipe 6, the mud-water mixture in the anoxic tank 2 flows to the aerobic tank 4 from the overflow pipe 6 after reaching a certain height, and the mud-water mixture in the aerobic tank 4 returns to the anoxic tank 2 from the bottom of the anoxic tank 2 through a return pipe 7 at the bottom of the aerobic tank 4. The ratio of the amount of the mixed liquid in the aerobic tank 4 which flows back to the anoxic tank 2 through the reflux pump 8 to the amount of the pumped water in the liquid extractor 9 is 5: 2. The liquid extractor 9 is provided with a liquid extracting end and a liquid discharging end, the liquid extracting end of the liquid extractor 9 is positioned in the aerobic tank 4, the membrane component 5 is sleeved on the liquid extracting end of the liquid extractor 9, and water in the mud-water mixture is extracted from the liquid extracting end of the liquid extractor 9 through the membrane component 5. The device realizes the switching of anaerobic and anoxic states of the anoxic tank 2 by intermittent stirring and intermittent reflux (stirring and reflux are carried out simultaneously or standing and reflux stopping are carried out simultaneously) of the anoxic tank 2, thereby not only greatly saving the power consumption and reducing the operation cost, but also strengthening the carbon source utilization process and realizing more excellent and stable denitrification and dephosphorization performance.
Specifically, in one embodiment, the sewage denitrification and dephosphorization apparatus further comprises an air pump 10, an air supply pipe 11 connected to an output end of the air pump 10, and an aerator 12 connected to the air supply pipe 11; the aerator 12 is arranged in the aerobic tank 4. The aeration stone in the aerobic tank 4 can spray air or oxygen to generate bubbles in the mud-water mixture so as to control dissolved oxygen of the sludge mixed liquor to be 1.0-2.5mg/L, and meanwhile, the bubbles generated by the aeration stone can also generate water flow in the aerobic tank 4, and the water flow can scour the membrane module 5 so as to delay pollution of the membrane module.
Specifically, in one embodiment, the gas flow meter 13 is mounted on the gas supply tube 11.
Specifically, in one embodiment, the sewage denitrification and dephosphorization apparatus further comprises a relay 14; the reflux pump 8 and the stirrer 3 are both electrically connected with a relay 14. The stirrer 3 and the reflux pump 8 are simultaneously externally connected with a relay 14 to realize synchronous control, and the relay 14 is alternately operated in a mode of being opened for one hour and closed for half an hour, so that the stirrer 3 and the reflux pump 8 can be synchronously started or synchronously closed.
Specifically, in one embodiment, the sewage denitrification and dephosphorization apparatus further comprises a first liquid level device 15 for detecting the highest liquid level of the liquid in the aerobic tank 4 and a second liquid level device 16 for detecting the lowest liquid level of the liquid in the aerobic tank 4; the first liquid level device 15 and the second liquid level device 16 are both electrically connected to the relay 14. The liquid level in the aerobic pool 4 is sensed by the first liquid level device 15 and the second liquid level device 16, so that the phenomenon that the membrane module 5 is exposed due to the fact that the liquid level in the aerobic pool 4 is too high or too low due to the fact that the liquid level in the aerobic pool 4 is too high and overflows or is low due to the fact that the liquid level in the aerobic pool 4 is too high or too low due to the fact that the water inlet speed and the water outlet speed are not consistent is avoided by the first liquid level device 15 and the second liquid level device.
Specifically, in one embodiment, the sewage denitrification and dephosphorization apparatus further comprises a liquid inlet pipe 17 and a liquid inlet pump 18 installed on the water inlet pipe; one end of the liquid inlet pipe 17 is communicated with the water receiver 1, and the other end of the liquid inlet pipe 17 is communicated with the anoxic tank 2. In the process of nitrogen and phosphorus removal, the amount of muddy water mixed liquor conveyed to the anoxic pond 2 by the water storage device 1 is equal to the amount of water pumped by the water pumping device.
Specifically, in one embodiment, the liquid extractor 9 includes an extraction pipe 91, a drain pump 92 installed on the extraction pipe 91; the liquid pumping pipe 91 is provided with a first end for draining water and a second end for pumping water, the second end of the liquid pumping pipe 91 is positioned in the aerobic tank 4, and the membrane component 5 is sleeved on the second end of the liquid pumping pipe 91.
Specifically, in one embodiment, the sewage denitrification and dephosphorization apparatus further includes a pressure gauge installed on the liquid pumping pipe 91, the pressure gauge is located between the drainage pump 92 and the second end of the liquid pumping pipe 91, when the membrane module 5 is blocked by mud, and when the water pumping pump pumps water, the pressure applied to the membrane module 5 changes, and by detecting the pressure of the membrane module 5, the membrane pollution condition and speed can be obtained through the reading change of the pressure gauge.
A method for removing nitrogen and phosphorus from sewage comprises the following steps:
the method comprises the following steps: preparing a water storage device, an anoxic tank provided with a stirrer, an aerobic tank provided with a membrane component, an overflow pipe provided with a reflux pump, a reflux pipe and a liquid pumping device;
step two: the water storage device is communicated with the anoxic tank, the anoxic tank and the aerobic tank form a circulation loop through an overflow pipe and a return pipe, and the membrane component is sleeved at the liquid pumping end of the liquid pumping device and is placed in the aerobic tank; compare traditional setting good oxygen pond and membrane tank, this device unites two into one good oxygen pond and membrane tank (membrane module), has removed the construction in two heavy ponds from, has greatly saved the capital construction expense. In addition, due to the hydrolysis and fermentation effects of the sludge settled in the anoxic tank, the denitrification and phosphorus release of the device are enhanced, the nitrogen and phosphorus removal effect of the device is enhanced, the power consumption is reduced, and the device has a good application prospect in treatment of municipal domestic sewage mainly containing low C/N.
Step three: taking the sludge-water mixed solution from a secondary sedimentation tank of a sewage treatment plant and placing the sludge-water mixed solution in a reservoir.
Step four: simultaneously, the muddy water mixed liquid in the liquid reservoir is injected into the anoxic tank, the muddy water mixed liquid flows into the aerobic tank through the overflow pipe, and the liquid reservoir stops supplying the muddy water mixed liquid when the muddy water mixed liquid in the aerobic tank reaches a specified liquid level; when the sludge-water mixed liquor enters the aerobic tank from the anoxic tank, ammonia nitrogen in the inlet water is converted into nitrate through nitrification, meanwhile, phosphate radicals released from the anoxic tank enter the aerobic tank, and phosphorus accumulating bacteria in the aerobic tank perform aerobic phosphorus absorption by using oxygen. The dissolved oxygen concentration of the aerobic pool is controlled to be 1.0-2.5mg/L by a gas flowmeter, and the specific dissolved oxygen concentration is determined according to the quality of inlet water. The hydraulic retention time HRT of the whole process is controlled to be 11-13 h so as to slow down the membrane pollution speed and strengthen the nitrogen and phosphorus removal.
Step five: and simultaneously starting the stirrer and the reflux pump for a period of time, and reducing the refluxed nitrate nitrogen into nitrogen through denitrification after full stirring. The microorganisms absorb part of the micromolecular organic matters and store the micromolecular organic matters as an internal carbon source of the microorganisms, and the denitrifying phosphorus accumulating bacteria in the anoxic pond utilize the internal carbon source to carry out denitrifying phosphorus absorption. In the sludge settling process, partial microorganisms utilize refractory organic matters to perform hydrolytic fermentation to generate volatile fatty acid for strengthening the denitrification process and the phosphorus release process.
And then simultaneously closing the stirrer and the reflux pump for a period of time, and simultaneously stopping the stirrer and the reflux pump in the anoxic tank from operating in the stage of simultaneously closing the stirrer and the reflux pump, so that the severe disturbance to the anoxic tank is reduced to the maximum extent, sludge in the tank is allowed to freely stand and precipitate, and the anaerobic process of the anoxic tank is realized. The process effectively reduces the oxidation-reduction potential of the sludge, and the oxidation-reduction potential can represent the relative degree of oxidability or reducibility of the device. The different oxidation-reduction potentials can lead to different microorganisms suitable for growth and different products. The hydrolytic acidification bacteria has wide application range to oxidation-reduction potential and can survive and propagate under the conditions of-100 and 100 mV. Thus, the hydrolytic fermentation process can be enhanced by monitoring and controlling the redox potential, increasing the production of VFAs. In addition, the oxidation-reduction potential can be used as an index for regulating and controlling a target fermentation product to evaluate the anaerobic fermentation process of the sludge. The oxidation-reduction potential of the sludge is reduced, the hydrolysis fermentation activity can be effectively enhanced, the conversion of granular and colloidal organic matters to soluble usable micromolecular organic matters is enhanced, the micromolecular organic matters are converted into products mainly containing volatile fatty acid through the intracellular reaction of fermentation bacteria in the mud-water mixture, and the problems that the effluent cannot reach the standard due to insufficient carbon sources in the urban domestic sewage and the like are solved to a certain extent. In addition, the intermittent operation of the stirrer and the reflux pump in the anoxic pond greatly reduces the daily operation power consumption of the sewage plant. The device has the advantages of simple sewage treatment method, strong applicability, high operability and obvious advantages in the aspects of energy conservation and consumption reduction.
Continuously repeating the opening and closing processes of the stirrer and the reflux pump; and continuously starting the liquid pumping device to drain, and continuously supplying the muddy water mixed liquid to the anoxic pond by the liquid storage device according to the drainage quantity. The purpose of intermittent standing and intermittent sludge backflow is to enable sludge to be intermittently stood and settled to replace continuous and complete mixing by reducing disturbance to a water body in an anoxic pond in a reasonable period of time, so as to manufacture a microbial growth environment with lower oxidation-reduction potential, realize the switching between anaerobic and anoxic states of the anoxic pond, strengthen the anoxic hydrolysis fermentation process of partial activated sludge (RAS), provide generated soluble organic matters (SCOD) and Volatile Fatty Acids (VFAs) to the PAOs phosphorus release process and the denitrification process of an anoxic zone, and further strengthen the integral nitrogen and phosphorus removal performance of the device.
Specifically, in one embodiment, in step three, the stirrer and the reflux pump are started for one hour and closed for half an hour simultaneously, and the process of starting the stirrer and the reflux pump simultaneously and closing the stirrer and the reflux pump simultaneously is repeated continuously. The intermittent operation of the stirrer and the reflux pump of the anoxic tank greatly reduces the daily operation power consumption of the sewage plant. The device has the advantages of simple sewage treatment method, strong applicability, high operability and obvious advantages in the aspects of energy conservation and consumption reduction.
Overall, the invention has the following advantages: the invention adopts a periodic operation mode of combining intermittent stirring and intermittent sludge backflow in a mode of opening for one hour and closing for half an hour to operate the AO-MBR process, theoretically, the power consumption of a stirrer and a backflow pump of 1/3 can be reduced, the service life of the device is prolonged, and the denitrification and dephosphorization effects of the process are enhanced.
The anaerobic and anoxic state switching of the anoxic tank is realized by alternately stirring, mixing and standing precipitation, a lower oxidation-reduction potential environment is created, anaerobic hydrolysis fermentation of sludge is enhanced, more volatile fatty acids are generated to participate in biochemical reaction, a potential growth environment for culturing and domesticating denitrifying phosphorus accumulating bacteria is provided, the denitrifying phosphorus accumulating bacteria is promoted to absorb VFAs (volatile fatty acids) under an anoxic condition to synthesize PHA (polyhydroxyalkanoate) in vivo, nitrate is utilized to decompose PHA in vivo by an electron acceptor under the anoxic condition to realize excessive phosphorus absorption, and one-carbon dual-purpose is realized, so that the effect of enhancing synchronous nitrogen and phosphorus removal is achieved. The denitrifying phosphorus removal is a process that denitrifying phosphorus-accumulating bacteria combine two processes of denitrifying and phosphorus-absorbing into one by using a carbon source, so that one-carbon dual-purpose synchronous nitrogen and phosphorus removal is realized, and the method is a novel efficient sewage treatment technology. On one hand, nitrate nitrogen in water is subjected to denitrification to generate nitrogen and escapes from the system, on the other hand, denitrifying phosphorus accumulating bacteria synthesize Polyhydroxyalkanoates (PHAs) by using VFAs in inlet water and VFAs generated by sludge hydrolytic fermentation under the anoxic condition, and the nitrate is used as an electron acceptor to decompose PHAs in the body to realize excessive phosphorus absorption under the anoxic condition. The existence of the denitrifying phosphorus accumulating bacteria with certain abundance in the system greatly relieves the problem of poor denitrification and dephosphorization effect caused by insufficient carbon source.
The method of the invention strengthens the hydrolysis fermentation process of the excess sludge, reduces the generation of sludge amount, and improves the nitrogen and phosphorus removal efficiency of the sewage, thereby realizing the co-treatment of the sludge and the sewage. Compared with AAO (anoxic, anoxic and aerobic), the anaerobic biological.
Taking municipal sewage treatment of a certain city as an example, the total volume of each device is 6.5L, wherein the anoxic tank is 3L, the aerobic tank is 3.5L, the daily treatment capacity is 13L, municipal domestic sewage is adopted for water inflow, the sewage enters the anoxic tank through a water inflow pump, the Hydraulic Retention Time (HRT) is about 12h, and the Sludge Retention Time (SRT) is about 25-30 d. The MLSS (mixed liquid suspended solid concentration) of the device is 7000mg/L at 5000-fold, the water temperature is about 22 ℃, the dissolved oxygen concentration of the aerobic pool is about 1.0-2.5mg/L, the dissolved oxygen concentration of the anoxic pool is lower than 0.02mg/L, and the pH value of the reaction pool is about 6-8.
The inlet water is actual domestic sewage, the COD content is 130-+ -The N content is 15-30mg/L, the TN content is 20-40mg/L, and the TP content is 1.5-7 mg/L.
The denitrification and dephosphorization conditions of the continuously-stirred sewage denitrification and dephosphorization device are shown in the following table:
| TN | TP | NH4+ -N | COD | |
| inflow (mg/L) | 29 | 4.8 | 22.4 | 210 |
| Water outlet (mg/L) | 14 | 1.02 | 0.06 | 11.27 |
| Removal rate | 51.7％ | 78.7％ | 99.9％ | 99％ |
Wherein TN refers to total nitrogen, TP refers to total phosphorus, NH4+ -N refers to ammonium nitrogen, COD refers to chemical oxygen demand, and the device operates for 90 days.
The nitrogen and phosphorus removal conditions of the intermittent stirring and indirect backflow sewage nitrogen and phosphorus removal device are shown in the following table:
| TN | TP | NH4+ -N | COD | |
| inflow (mg/L) | 29 | 4.8 | 22.4 | 210 |
| Water outlet (mg/L) | 7 | 0.52 | 0.07 | 10.62 |
| Removal rate | 75.9％ | 89.2％ | 99.9％ | 99％ |
Wherein TN refers to total nitrogen, TP refers to total phosphorus, NH4+ -N refers to ammonium nitrogen, COD refers to chemical oxygen demand, and the device operates for 90 days.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
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| CN113603217A (en) * | 2021-08-24 | 2021-11-05 | 国投信开水环境投资有限公司 | Enhanced biological denitrification device and method suitable for sewage treatment |
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Application publication date: 20210706 |