CN110723819B - Method for realizing synchronous nitrogen and phosphorus removal of domestic sewage in high-altitude areas by optimally controlling aeration flow - Google Patents
Method for realizing synchronous nitrogen and phosphorus removal of domestic sewage in high-altitude areas by optimally controlling aeration flow Download PDFInfo
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Abstract
The invention discloses a method for realizing synchronous nitrogen and phosphorus removal of domestic sewage in a high-altitude area by optimally controlling aeration flow. Aiming at the problem that the nitrogen and phosphorus removal effect is poor due to unreasonable control of dissolved oxygen in a domestic sewage treatment system in a high-altitude area at the present stage, the method adopts an anaerobic/aerobic SBR reactor, ensures that the concentration of the Dissolved Oxygen (DO) in the reactor is 0 mg/L-2.5 mg/L by optimally controlling the aeration flow, ensures that the reactor stably operates in a low-pressure and low-oxygen environment, and realizes synchronous nitrogen and phosphorus removal of the domestic sewage in the high-altitude area. The method reduces the demand of the anaerobic/aerobic SBR reactor on the dissolved oxygen in the operation of the system, realizes the reasonable control of the concentration of the dissolved oxygen by optimally controlling the aeration flow, and is more scientific and energy-saving compared with pure oxygen aeration, high-pressure aeration and long-time high-power aeration modes.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a method for realizing synchronous nitrogen and phosphorus removal of domestic sewage in a high-altitude area by optimally controlling aeration flow.
Background
In recent years, due to economic development and regional development, the environmental protection problem in high-altitude areas such as Tibet is increasingly prominent, and particularly, the treatment of urban domestic sewage is still in the beginning stage. The most obvious external objective environmental factors in high altitude areas are high altitude, and the large temperature difference, strong ultraviolet rays and low air pressure caused by the high altitude.
Because of high altitude, low air pressure, large temperature difference and low annual average temperature, sewage treatment plants constructed in these regions have special requirements on sewage treatment technology, and technologies such as a biological aerated filter, a biological contact oxidation method, an activated sludge and a biofilm method can be generally selected. However, the low-temperature, low-pressure and low-oxygen conditions limit the operating efficiency of the traditional activated sludge/biofilm process, the actual oxygen supply amount in the same aeration amount is only about half of that in plain areas, the metabolism of aerobic organisms is influenced due to insufficient oxygen supply amount, and the energy consumption is increased due to increase of the aeration amount.
Synchronous Nitrification and Denitrification Phosphorus Removal (SNDPR) means that nitrification and denitrification phosphorus removal reactions can be carried out in the same reactor. The SNDPR system realizes denitrification and dephosphorization by using an internal carbon source, has two purposes of one carbon and saves the carbon source; the nitrification process requires alkalinity, and the denitrification process just can provide partial alkalinity for the nitrification process, so that the alkalinity is saved; the reaction is carried out under the condition of low aeration quantity, so that the energy consumption and the loss of organic matters are saved.
The sewage treatment system in the high-altitude area has the problems of irregular aeration, unreasonable control of the concentration of dissolved oxygen, high operation energy consumption and the like, and the common processes in the high-altitude area, such as an AAO process and a CASS process, have higher requirements on the dissolved oxygen. Therefore, the invention realizes synchronous nitrification and denitrification dephosphorization by utilizing the synchronous nitrification and denitrification dephosphorization (SNDPR) to reduce the demand of the system on dissolved oxygen, saves energy consumption by optimizing aeration flow, and simultaneously realizes synchronous denitrification and dephosphorization of the domestic sewage in the high-altitude area.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for realizing synchronous nitrogen and phosphorus removal of domestic sewage in a high-altitude area by optimally controlling aeration flow, and solves the problems of irregular aeration, unreasonable control of dissolved oxygen concentration, high operation energy consumption and the like of a sewage treatment system in the high-altitude area.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for realizing synchronous nitrogen and phosphorus removal of domestic sewage in high-altitude areas by optimally controlling aeration flow comprises the following steps:
(1) under a low-altitude environment, inoculating sludge in an anaerobic/aerobic SBR reactor, starting a water inlet pump in an anaerobic/aerobic operation mode, pumping domestic sewage in a high-altitude area into the reactor, carrying out an aerobic stage after anaerobic stirring, starting an aeration pump, aerating with proper aeration flow, and monitoring DO concentration of the aerobic stage in a single period by using an online DO monitor until the removal rates of COD, ammonia nitrogen, total nitrogen and total phosphorus in the reactor reach more than 80%, 95%, 75% and 90%;
(2) under the high-altitude environment, monitoring the DO concentration of an aerobic stage in a single period by using an online DO monitor under the same equipment and reaction conditions as those in the step (1), judging whether the removal rates of COD, ammonia nitrogen, total nitrogen and total phosphorus in the reactor reach more than 80%, 95%, 75% and 90%, if not, discharging the residual sludge and the treated domestic sewage after stopping aeration, and continuing the next step;
(3) repeating the step (2), and only adjusting the aeration flow each time until the removal rates of COD, ammonia nitrogen, total nitrogen and total phosphorus in the reactor reach more than 80%, 95%, 75% and 90%, wherein the aeration flow at the moment is an optimized result;
(4) by utilizing the optimization result, the synchronous nitrogen and phosphorus removal of the domestic sewage in the high-altitude area is carried out in the anaerobic/aerobic SBR reactor.
The low-altitude environment and the high-altitude environment are both simulation environments, and in a simulation scene, the atmospheric pressure of an experimental environment is adjusted to 95-101 kPa, the temperature is adjusted to 18-22 ℃, and the low-altitude environment is simulated; and adjusting the atmospheric pressure of the experimental environment to be 55-80 kPa and the temperature to be 18-22 ℃, and simulating the high-altitude environment.
The sludge inoculated in the anaerobic/aerobic SBR reactor is synchronously nitrified endogenous denitrifying phosphorus removal sludge, the sludge is taken from a stably operated denitrifying phosphorus removal reactor, and the concentration of activated sludge in the reactor after inoculation is 1300-2000 mg/L.
And (2) controlling the DO concentration to be 0-2.5 mg/L in the step (1), and controlling the DO concentration to be 0-2.5 mg/L in the step corresponding to the aeration flow rate with the optimized result.
In each step, sewage is pumped in 10 minutes before the anaerobic stage, an electric stirrer of the anaerobic/aerobic SBR reactor is started to stir for 2-2.5 hours when the sewage is pumped in, the anaerobic stage is realized, and the aeration time is 3-3.5 hours later, the aerobic stage is realized.
The adjustment strategy of the aeration flow rate is as follows:
a) on the basis of the aeration flow in the step (1), increasing a, for example, 70mL/min each time until the removal rate indexes of COD, ammonia nitrogen, total nitrogen and total phosphorus meet the requirements;
b) on the basis of the aeration flow obtained in the step a), b is reduced and is less than a each time, for example, 20mL/min until the removal rate indexes of COD, ammonia nitrogen, total nitrogen and total phosphorus do not meet the requirements;
c) on the basis of the aeration flow obtained in the step a), c is increased and less than b every time, for example, 10mL/min until the removal rate indexes of COD, ammonia nitrogen, total nitrogen and total phosphorus meet the requirements;
repeating the steps (b) to (c), wherein the increase and decrease range of each time is reduced, and the aeration flow value meeting the error requirement is selected as an optimization result; or selecting the aeration flow value with the DO concentration closest to the DO concentration in the step (1) as an optimization result from a plurality of aeration flow values with COD, ammonia nitrogen, total nitrogen and total phosphorus removal rate indexes meeting the requirements.
Further, the excess sludge may be discharged by a sludge discharge pump within the last 1 minute of the anaerobic/aerobic SBR reactor discharge phase.
The domestic sewage in the high-altitude area has the COD concentration of 200-250 mg/L, the ammonia nitrogen concentration of 20-40 mg/L and the total phosphorus concentration of 3-6 mg/L.
The treated domestic sewage accounts for 40-45% of the total water quantity in the reactor by mass.
The method of the invention is realized by the following equipment:
the anaerobic/aerobic reactor 1 is a reaction body and is provided with a water inlet 16, a water outlet 17, a sludge discharge port 18 and an overflow port 19
The water inlet tank 3 is used for storing domestic sewage in a high-altitude area and is connected with the water inlet 16 through a water inlet pipeline with a water inlet pump 2;
the built-in electric stirrer 4 is built in the anaerobic/aerobic reactor 1;
the aerator 5 is arranged in the anaerobic/aerobic reactor 1 and is connected with an aeration pump 20 through an air inlet pipeline with a gas flowmeter 6;
a drain pump 7 connected to the drain port 17 through a drain line;
the sludge discharge pump 13 is connected with a sludge discharge port 18 through a sludge discharge pipeline;
a pH meter 14, the pH probe 10 of which is arranged in the anaerobic/aerobic reactor 1;
a DO measuring instrument 15, wherein a DO probe 11 of the DO measuring instrument is arranged in the anaerobic/aerobic reactor 1;
a paperless recorder 8 connected with the pH meter 14 and the DO meter 15 for recording the measured data;
a sampler 9 for sampling from the anaerobic/aerobic reactor 1;
and a timing switch 12 which is connected with the water inlet pump 2, the electric stirrer 4, the aeration pump 20, the drainage pump 7 and the sludge discharge pump 13 to control the working state.
By utilizing the device, the synchronous nitrogen and phosphorus removal of the domestic sewage in the high-altitude area is realized by optimally controlling the aeration flow.
Compared with the prior art, the invention has the beneficial effects that: under the low-pressure condition that the atmospheric pressure is 70-80 KPa, the requirements of a synchronous nitrification and denitrification dephosphorization reduction system on dissolved oxygen are realized by utilizing synchronous nitrification and denitrification dephosphorization (SNDPR), the energy consumption is saved by optimizing the aeration flow, and meanwhile, the synchronous denitrification and dephosphorization of the domestic sewage in the high-altitude area is realized, and the removal rates of ammonia nitrogen, total nitrogen and total phosphorus reach more than 95%, 75% and 90%.
Drawings
FIG. 1 is a schematic structural diagram of a device for realizing synchronous nitrogen and phosphorus removal of domestic sewage in high-altitude areas by optimally controlling aeration flow.
FIG. 2 shows COD, TN, and NH in a typical period when an anaerobic/aerobic SBR reactor is stably operated at an atmospheric pressure of 101KPa and an aeration flow rate of 80mL/min4 +-N、NO3 --N、NO2 -N, TP concentration profile.
FIG. 3 shows COD, TN, NH in a typical period when the anaerobic/aerobic SBR reactor is stably operated at an atmospheric pressure of 72KPa and an aeration flow rate of 80mL/min4 +-N、NO3 --N、NO2 -N, TP concentration profile.
FIG. 4 shows COD, TN, and NH in a typical period when the anaerobic/aerobic SBR reactor is stably operated at an atmospheric pressure of 72KPa and an aeration flow rate of 100mL/min4 +-N、NO3 --N、NO2 -N, TP concentration profile.
FIG. 5 shows COD, TN, NH in a typical period when an anaerobic/aerobic SBR reactor is stably operated at an atmospheric pressure of 72KPa and an aeration flow rate of 150mL/min4 +-N、NO3 --N、NO2 -N, TP concentration profile.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in FIG. 1, the invention relates to a method for realizing synchronous nitrogen and phosphorus removal of domestic sewage in a high-altitude area by optimally controlling aeration flow, which mainly comprises the following steps: the anaerobic/aerobic reactor comprises an anaerobic/aerobic reactor 1, a water inlet pump 2, a water inlet tank 3, an electric stirrer 4, an aerator 5, a gas flowmeter 6, a drainage pump 7, a paperless recorder 8, a sampler 9, a pH probe 10, a DO probe 11, a timing switch 12, a dredge pump 13, a pH tester 14 and a DO tester 15; a water inlet 16, a water outlet 17, a sludge discharge port 18, an overflow port 19 and an aeration pump 20 are arranged; wherein, the water inlet tank 3 is connected with the water inlet 16 of the anaerobic/aerobic reactor 1 through the water inlet pump 2, the outlet water is pumped out from the drainage pump 7 through the water outlet 17, and the residual sludge is pumped out from the sludge discharge pump 13 through the sludge discharge port 18; wherein, the working state of the water inlet pump 2, the electric stirrer 4, the aeration pump 20, the drainage pump 7 and the sludge discharge pump 13 is controlled by the timing switch 12.
A method for realizing synchronous nitrogen and phosphorus removal of domestic sewage in a high-altitude area by optimally controlling aeration flow is characterized by comprising the following steps:
in the first stage, inoculating sludge in an anaerobic/aerobic SBR reactor is taken from a stably operated denitrification and dephosphorization reactor, the concentration of active sludge in the reactor is kept to be 1300-2000 mg/L, inlet water is simulated domestic sewage in a high-altitude area, wherein the COD concentration is 220mg/L, the ammonia nitrogen concentration is 37mg/L, the total phosphorus concentration is 5mg/L, the effective volume of the reactor is 5L, and the water change ratio is 25%. The anaerobic/aerobic SBR reactor was operated in a low altitude environment at an atmospheric pressure of 101KPa and a temperature of 20 ℃. The operation period is 6 hours, wherein the anaerobic time is 2 hours, the aerobic time is 3.5 hours, the aeration flow is 80mL/min, and the dissolved oxygen in the aerobic stage in a single period is monitored by using an online DO monitor until the removal rates of ammonia nitrogen, total nitrogen and total phosphorus in the reactor reach more than 95%, 75% and 90%.
And in the second stage, inoculating sludge in the anaerobic/aerobic SBR reactor and taking the sludge from the stably operated denitrification and dephosphorization reactor, wherein the anaerobic/aerobic SBR reactor operates in a high-altitude environment, the atmospheric pressure is 72KPa, and the temperature is 20 ℃. The effective volume of the reactor is 5L, and the water exchange ratio is 25%. The operation period of the reactor is 6 hours, the period operation stage is to simulate that domestic sewage in a high-altitude area enters an anaerobic/aerobic SBR reactor in a high-altitude environment within the first 10 minutes of an anaerobic stage, wherein the COD concentration is 220mg/L, the ammonia nitrogen concentration is 40mg/L, the total phosphorus concentration is 5mg/L, and the reactor is mechanically stirred for 2 hours under the anaerobic condition; the anaerobic/aerobic SBR reactor starts aeration and mechanical aeration, the aeration flow is 80mL/min, the reaction lasts for 3.5 hours, the dissolved oxygen in the aerobic stage in a single period is monitored by using an online DO monitor, and the removal rate of COD, ammonia nitrogen, total nitrogen and total phosphorus is calculated; discharging excess sludge through a sludge discharge pump within 1 minute before the anaerobic/aerobic SBR reactor finishes aeration; stopping aeration of the anaerobic/aerobic SBR reactor, standing for precipitation, and discharging 40% of the treated domestic sewage out of the reactor by using a drainage pump.
And in the third stage, inoculating sludge in the anaerobic/aerobic SBR reactor and taking the sludge from the stably operated denitrification and dephosphorization reactor, wherein the anaerobic/aerobic SBR reactor operates in a high-altitude environment, the atmospheric pressure is 72KPa, and the temperature is 20 ℃. The effective volume of the reactor is 5L, and the water exchange ratio is 25%. The operation period of the reactor is 6 hours, the period operation stage is to simulate that domestic sewage in a high-altitude area enters an anaerobic/aerobic SBR reactor in a high-altitude environment within the first 10 minutes of an anaerobic stage, wherein the COD concentration is 220mg/L, the ammonia nitrogen concentration is 40mg/L, the total phosphorus concentration is 5mg/L, and the reactor is mechanically stirred for 2 hours under the anaerobic condition; the anaerobic/aerobic SBR reactor starts aeration and mechanical aeration, the aeration flow is 100mL/min, the reaction lasts for 3.5 hours, the dissolved oxygen in the aerobic stage in a single period is monitored by using an online DO monitor, and the removal rate of COD, ammonia nitrogen, total nitrogen and total phosphorus is calculated; discharging excess sludge through a sludge discharge pump within 1 minute before the anaerobic/aerobic SBR reactor finishes aeration; stopping aeration of the anaerobic/aerobic SBR reactor, standing for precipitation, and discharging 40% of the treated domestic sewage out of the reactor by using a drainage pump.
And in the fourth stage, inoculating sludge in the anaerobic/aerobic SBR reactor and taking the sludge from the stably operated denitrification and dephosphorization reactor, wherein the anaerobic/aerobic SBR reactor operates in a high-altitude environment, the atmospheric pressure is 72KPa, and the temperature is 20 ℃. The effective volume of the reactor is 5L, and the water exchange ratio is 25%. The operation period of the reactor is 6 hours, the period operation stage is to simulate that domestic sewage in a high-altitude area enters an anaerobic/aerobic SBR reactor in a high-altitude environment within the first 10 minutes of an anaerobic stage, wherein the COD concentration is 220mg/L, the ammonia nitrogen concentration is 40mg/L, the total phosphorus concentration is 5mg/L, and the reactor is mechanically stirred for 2 hours under the anaerobic condition; the anaerobic/aerobic SBR reactor starts aeration and mechanical aeration, the aeration flow is 150mL/min, the reaction lasts for 3.5 hours, the dissolved oxygen in the aerobic stage in a single period is monitored by using an online DO monitor, and the removal rate of COD, ammonia nitrogen, total nitrogen and total phosphorus is calculated; discharging excess sludge through a sludge discharge pump within 1 minute before the anaerobic/aerobic SBR reactor finishes aeration; stopping aeration of the anaerobic/aerobic SBR reactor, standing for precipitation, and discharging 40% of the treated domestic sewage out of the reactor by using a drainage pump.
The test result shows that: after the first stage is operated stably, the COD concentration of the effluent of the anaerobic/aerobic SBR reactor is 8.50mg/L, the ammonia nitrogen concentration is 0mg/L, the nitrite nitrogen concentration is 0.03mg/L, the nitrate nitrogen concentration is 9mg/L, the total nitrogen concentration is 9.03mg/L and the total phosphorus concentration is 0.58 mg/L. COD, TN and NH in typical period when anaerobic/aerobic SBR reactor is stably operated4 +-N、NO3 --N、NO2 -The concentration variation of-N, TP is shown in FIG. 2.
After the second stage operation is stable, the COD concentration of the effluent of the anaerobic/aerobic SBR reactor is 47.06mg/L, the ammonia nitrogen concentration is 10.13mg/L, the nitrite nitrogen concentration is 0.13mg/L, the nitrate nitrogen concentration is 0.87mg/L, the total nitrogen concentration is 11.13mg/L and the total phosphorus concentration is 0.19 mg/L. COD, TN and NH in typical period when anaerobic/aerobic SBR reactor is stably operated4 +-N、NO3 --N、NO2 -The concentration variation of-N, TP is shown in FIG. 3.
After the operation of the third stage is stable, the COD concentration of the effluent of the anaerobic/aerobic SBR reactor is 45.45mg/L, the ammonia nitrogen concentration is 0mg/L, the nitrite nitrogen concentration is 0.11mg/L, the nitrate nitrogen concentration is 9.60mg/L, the total nitrogen concentration is 9.71mg/L and the total phosphorus concentration is 0.06 mg/L. COD, TN and NH in typical period when anaerobic/aerobic SBR reactor is stably operated4 +-N、NO3 --N、NO2 -The concentration variation of-N, TP is shown in FIG. 4.
After the fourth stage is operated stably, the COD concentration of the effluent of the anaerobic/aerobic SBR reactor is 39.77mg/L, the ammonia nitrogen concentration is 0mg/L, the nitrite nitrogen concentration is 0mg/L, the nitrate nitrogen concentration is 9.60mg/L, the total nitrogen concentration is 9.60mg/L and the total phosphorus concentration is 0 mg/L. COD, TN and NH in typical period when anaerobic/aerobic SBR reactor is stably operated4 +-N、NO3 --N、NO2 -The concentration variation of-N, TP is shown in FIG. 5.
FIGS. 2, 3, 4 and 5 show that when the atmospheric pressure of the anaerobic/aerobic SBR reactor is 101KPa and the aeration flow is 80mL/min, the dissolved oxygen concentration in the reactor is 0-1.5 mg/L when the operation time is 0-340 min, and the removal rates of ammonia nitrogen, total nitrogen and total phosphorus respectively reach 100%, 77% and 90%. When the atmospheric pressure of the anaerobic/aerobic SBR reactor is 72KPa and the aeration flow is 80mL/min, the dissolved oxygen concentration of the reactor is 0-0.3 mg/L, the ammonia nitrogen removal rate is 70%, and the ammonia nitrogen removal rate does not reach the first-grade B standard of discharge Standard of pollutants for municipal wastewater treatment plants (GB 18918-2002). When the atmospheric pressure of the anaerobic/aerobic SBR reactor is 72KPa, the aeration flow is 100mL/min and 150mL/min, the dissolved oxygen concentration of the reactor is 0-1 mg/L and 0-2.5 mg/L respectively, and the removal rates of ammonia nitrogen, total nitrogen and total phosphorus respectively reach more than 100%, 75% and 99%, which meet the requirements.
When the aeration flow is 100mL/min, the dissolved oxygen concentration of the reactor is 0-1 mg/L, so that the synchronous nitrogen and phosphorus removal of the domestic sewage in the high-altitude area is met, the condition that the effluent reaches the first-class B standard of pollutant discharge Standard of urban Sewage treatment plant (GB18918-2002), and compared with the aeration flow of 150mL/min, the energy consumption can be saved, so that 100mL/min can be selected as the aeration flow, and the synchronous nitrogen and phosphorus removal of the domestic sewage in the high-altitude area is carried out in the anaerobic/SBR reactor under the condition that the atmospheric pressure is 72 KPa.
Claims (8)
1. A method for realizing synchronous nitrogen and phosphorus removal of domestic sewage in high-altitude areas by optimally controlling aeration flow comprises the following steps:
(1) under a low-altitude environment, inoculating sludge in an anaerobic/aerobic SBR reactor, starting a water inlet pump in an anaerobic/aerobic operation mode, pumping domestic sewage in a high-altitude area into the reactor, carrying out an aerobic stage after anaerobic stirring, starting an aeration pump for aeration, and monitoring DO concentration of the aerobic stage in a single period by using an online DO monitor until the removal rates of COD, ammonia nitrogen, total nitrogen and total phosphorus in the reactor reach more than 80%, 95%, 75% and 90%, wherein the low-altitude environment and the high-altitude environment are both simulation environments, and in a simulation scene, the atmospheric pressure of the experiment environment is adjusted to 95-101 kPa, the temperature is 18-22 ℃, and the low-altitude environment is simulated; adjusting the atmospheric pressure of the experimental environment to be 55-80 kPa, and the temperature to be 18-22 ℃, and simulating the high-altitude environment;
(2) under the high-altitude environment, monitoring the DO concentration of an aerobic stage in a single period by using an online DO monitor under the same equipment and reaction conditions as those in the step (1), judging whether the removal rates of COD, ammonia nitrogen, total nitrogen and total phosphorus in the reactor reach more than 80%, 95%, 75% and 90%, if not, discharging the residual sludge and the treated domestic sewage after stopping aeration, and continuing the next step;
(3) repeating the step (2), and only adjusting the aeration flow each time until the removal rates of COD, ammonia nitrogen, total nitrogen and total phosphorus in the reactor reach more than 80%, 95%, 75% and 90%, wherein the aeration flow at the moment is an optimized result;
(4) the optimization result is utilized to synchronously denitrify and dephosphorize the domestic sewage of the high-altitude area in the anaerobic/aerobic SBR reactor;
the method is characterized in that the aeration flow rate adjustment strategy is as follows:
a) on the basis of the aeration flow in the step (1), increasing 70mL/min every time until the removal rate indexes of COD, ammonia nitrogen, total nitrogen and total phosphorus meet the requirements;
b) on the basis of the aeration flow obtained in the step a), reducing by 20mL/min each time until the removal rate indexes of COD, ammonia nitrogen, total nitrogen and total phosphorus do not meet the requirements;
c) on the basis of the aeration flow obtained in the step a), 10mL/min is increased every time until the removal rate indexes of COD, ammonia nitrogen, total nitrogen and total phosphorus meet the requirements;
repeating the steps (b) to (c), wherein the increase and decrease range of each time is reduced, and the aeration flow value meeting the error requirement is selected as an optimization result; or selecting the aeration flow value with the DO concentration closest to the DO concentration in the step (1) as an optimization result from a plurality of aeration flow values with COD, ammonia nitrogen, total nitrogen and total phosphorus removal rate indexes meeting the requirements.
2. The method for optimizing and controlling aeration flow to realize synchronous nitrogen and phosphorus removal of domestic sewage in high-altitude areas according to claim 1, wherein the sludge inoculated in the anaerobic/aerobic SBR is synchronous nitrification endogenous denitrification phosphorus removal sludge, the sludge is taken from a stably operated nitrogen and phosphorus removal reactor, and the concentration of activated sludge in the inoculated reactor is 1300-2000 mg/L.
3. The method for realizing synchronous nitrogen and phosphorus removal of domestic sewage in high-altitude areas by optimizing and controlling aeration flow according to claim 1, wherein DO concentration is controlled to be 0-2.5 mg/L in the step (1), and DO concentration is also controlled to be 0-2.5 mg/L in the step corresponding to the obtained aeration flow with optimized results.
4. The method for synchronously removing nitrogen and phosphorus from domestic sewage in high-altitude areas by optimally controlling aeration flow according to claim 1, wherein in each step, sewage is pumped in 10 minutes before the anaerobic stage, an electric stirrer of an anaerobic/aerobic SBR reactor is started to stir for 2-2.5 hours during the sewage pumping, the anaerobic stage is adopted, and the aeration time is 3-3.5 hours later, the aerobic stage is adopted.
5. The method for synchronously removing nitrogen and phosphorus from domestic sewage in high-altitude areas by optimally controlling the aeration flow according to claim 1, wherein the residual sludge is discharged by a sludge discharge pump within the last 1 minute of the drainage stage of the anaerobic/aerobic SBR reactor.
6. The method for synchronously removing nitrogen and phosphorus from domestic sewage in the high-altitude area by optimally controlling the aeration flow according to claim 1, wherein the domestic sewage in the high-altitude area has a COD concentration of 200-250 mg/L, an ammonia nitrogen concentration of 20-40 mg/L and a total phosphorus concentration of 3-6 mg/L.
7. The method for synchronously removing nitrogen and phosphorus from domestic sewage in the high-altitude areas by optimally controlling the aeration flow according to claim 1, wherein the treated domestic sewage accounts for 40-45% of the total water content in the reactor by mass.
8. The method for synchronously removing nitrogen and phosphorus from domestic sewage in high-altitude areas by optimally controlling aeration flow according to claim 1, is characterized by being realized by utilizing the following equipment:
an anaerobic/aerobic SBR reactor (1) which is a reaction main body and is provided with a water inlet (16), a water outlet (17), a sludge discharge port (18) and an overflow port (19);
the water inlet tank (3) is used for storing domestic sewage in a high altitude area and is connected with the water inlet (16) through a water inlet pipeline with a water inlet pump (2);
the built-in electric stirrer (4) is built in the anaerobic/aerobic SBR reactor (1);
the aerator (5) is arranged in the anaerobic/aerobic SBR reactor (1) and is connected with an aeration pump (20) through an air inlet pipeline with a gas flowmeter (6);
a drain pump (7) connected to the drain port (17) through a drain line;
the sludge discharge pump (13) is connected with the sludge discharge port (18) through a sludge discharge pipeline;
a pH measuring instrument (14) with a pH probe (10) built in the anaerobic/aerobic SBR reactor (1);
a DO measuring instrument (15) with a DO probe (11) arranged in the anaerobic/aerobic SBR reactor (1);
a paperless recorder (8) which is connected with the pH measuring instrument (14) and the DO measuring instrument (15) and records the measured data;
a sampler (9) for sampling from the anaerobic/aerobic SBR reactor (1);
a timing switch (12), wherein the timing switch is connected with the water inlet pump (2), the electric stirrer (4), the aeration pump (20), the drainage pump (7) and the sludge discharge pump (13) to control the working state;
by utilizing the equipment, the synchronous nitrogen and phosphorus removal of the domestic sewage in the high-altitude area is realized by optimally controlling the aeration flow.
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| CN113003724A (en) * | 2021-02-08 | 2021-06-22 | 东南大学 | Method for optimizing anaerobic/aerobic time to realize synchronous nitrogen and phosphorus removal of SNDPR system of domestic sewage in high-altitude area |
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| CN107265625B (en) * | 2017-08-22 | 2020-08-25 | 河海大学 | Plateau area aeration system and aeration method |
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