CN113387458B - Continuous flow intermittent aeration operation method for surface aeration oxidation ditch process - Google Patents

Continuous flow intermittent aeration operation method for surface aeration oxidation ditch process Download PDF

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CN113387458B
CN113387458B CN202110787195.9A CN202110787195A CN113387458B CN 113387458 B CN113387458 B CN 113387458B CN 202110787195 A CN202110787195 A CN 202110787195A CN 113387458 B CN113387458 B CN 113387458B
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aerator
concentration
aeration
oxidation ditch
ammonia nitrogen
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CN113387458A (en
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尹华升
何全
王丹艳
陈雷
尹文韬
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Hunan Jinghui Energy Saving Technology Co ltd
Hunan Academy Of Architectural Sciences Co ltd
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Hunan Jinghui Energy Saving Technology Co ltd
Hunan Academy Of Architectural Sciences Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/308—Biological phosphorus removal
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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  • Hydrology & Water Resources (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
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  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Activated Sludge Processes (AREA)

Abstract

The invention discloses a continuous flow intermittent aeration operation method of a surface aeration oxidation ditch process, which forms continuous flow intermittent aeration mode operation by controlling the periodic start and stop of a first aerator and a second aerator, realizes that an oxidation ditch alternately operates according to aerobic/anoxic, detects the effluent of the oxidation ditch through a plurality of detection devices, controls the start and stop of an aeration system according to detection parameters by an external control unit, realizes continuous flow intermittent aeration, has small transformation difficulty and obvious energy-saving and emission-reducing effects, can improve the removal rate of total nitrogen and total phosphorus by more than 10 percent, and can save the power consumption of the aeration system by more than 50 percent; can reduce the dosage of external carbon source and phosphorus removal agent, has obvious carbon emission reduction effect and wide application prospect.

Description

Continuous flow intermittent aeration operation method for surface aeration oxidation ditch process
Technical Field
The invention relates to the technical field of sewage treatment energy conservation, in particular to a continuous flow intermittent aeration operation method of a surface aeration oxidation ditch process.
Background
Urban sewage treatment is a high-energy-consumption industry, and energy consumption mainly comprises multiple aspects of electricity consumption, medicament treatment, sludge treatment and the like, wherein the electricity consumption accounts for about 70-80% of total energy consumption. Wherein the power consumption of the aeration system accounts for 50-70% of the total power consumption of the sewage treatment plant, so the energy conservation and consumption reduction of the sewage treatment plant should be started from the optimized operation of the aeration system preferentially. The oxidation ditch process is the second most sewage treatment process applied in China, and according to 2019 statistical data, the process accounts for 29 percent of the total number of urban sewage treatment plants in China, and about 1330 is the process. The oxidation ditch process can simultaneously remove nitrogen and phosphorus, but because the phosphorus-accumulating bacteria and the nitrobacteria denitrifying bacteria have different requirements on living environment and have contradictions on the competition of the requirements on carbon sources, the biological nitrogen and phosphorus removal efficiency of the oxidation ditch process is not high, excessive aeration is easy to occur, the contradiction of insufficient carbon sources is aggravated, and the energy consumption of a sewage treatment plant is high. How to optimize the operation of an aeration system of an oxidation ditch process, efficiently utilize an internal carbon source in sewage, improve the nitrogen and phosphorus removal effect, reduce the power consumption and the medicine consumption of a sewage treatment plant, reduce carbon emission and become a hotspot and a difficulty of current research.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a continuous flow intermittent aeration operation method of a surface aeration oxidation ditch process, which optimizes the operation mode of an aeration system of the oxidation ditch process, realizes aerobic/anoxic alternate operation in an aerobic tank of an oxidation ditch, efficiently utilizes an internal carbon source in sewage, improves the nitrogen and phosphorus removal effect, realizes energy conservation and consumption reduction, and reduces the power consumption and medicine consumption of a sewage treatment plant.
(II) technical scheme
In order to realize the purpose, the invention is realized by the following technical scheme: a continuous flow intermittent aeration operation method for a surface aeration oxidation ditch process comprises the following steps:
s1: setting a detection object and a detection standard range;
s2: setting the initial aeration period of a first aerator and a second aerator in an aerobic pool of an oxidation ditch:
s21: the first aerator and the second aerator are started to operate simultaneously for a first fixed time, named as T0, wherein the T0 is 30-60 min;
s22: stopping the second aerator, and stopping the first aerator after the first aerator continues to operate for a second fixed time, wherein the second fixed time is marked as T1, and the T1 is 30-150 min;
s23: the first aerator and the first aerator are stopped at the same time for a third fixed time and then started, the third fixed time is marked as T2, and the T2 is 60-180 min;
s3: detecting the effluent of the oxidation pond, and comparing and analyzing the detection result with a preset detection standard range to obtain an analysis result;
s4: adjusting the start and stop of the first aerator and the second aerator in real time according to the analysis result:
s41: and when the detection result is in the detection standard range, the first aerator and the second aerator operate according to the initial aeration period, otherwise, the start and stop of the first aerator and the second aerator are adjusted in real time and the S3 is returned.
Preferably, in the S1, the detection objects are dissolved oxygen concentration, ammonia nitrogen concentration and nitrate nitrogen concentration;
the detection standard range is that the concentration of dissolved oxygen is 0-3.0 mg/L, the concentration of ammonia nitrogen is 0-7 mg/L, the concentration of nitrate nitrogen is 0-12 mg/L, and the sum of the concentration of nitrate nitrogen and the concentration of ammonia nitrogen is 0-18 mg/L.
Preferably, detecting the ammonia nitrogen concentration value of the effluent of the oxidation ditch by an online ammonia nitrogen automatic analyzer;
detecting the nitrate nitrogen concentration of the effluent of the oxidation ditch by an online nitrate nitrogen automatic analyzer;
and detecting the dissolved oxygen concentration of the effluent of the oxidation ditch by an online dissolved oxygen automatic analyzer.
Preferably, when the first aerator is operated and the second aerator is shut down, when the dissolved oxygen concentration is lower than 3.0mg/L or the ammonia nitrogen concentration is higher than 1.0mg/L or the nitrate nitrogen concentration is lower than 12mg/L, the first aerator is operated for a first fixed time and then shut down, otherwise, the first aerator is shut down;
when the first aerator and the second aerator are both stopped, when the ammonia nitrogen concentration is lower than 7mg/L or the sum of the ammonia nitrogen concentration and the nitrate nitrogen concentration is lower than 18mg/L, the first aerator and the second aerator are both stopped until the second fixed time and then started at the same time, otherwise, the first aerator and the second aerator are started at the same time.
(III) advantageous effects
The invention provides a continuous flow intermittent aeration operation method for a surface aeration oxidation ditch process. The method has the following beneficial effects:
the invention adopts a continuous flow intermittent aeration mode to operate, realizes the alternate aerobic/anoxic operation in the oxidation ditch aerobic tank, can improve the biological nitrogen and phosphorus removal effect of the oxidation ditch, and can improve the removal rate of total nitrogen and total phosphorus by more than 10 percent;
the invention adopts intermittent aeration, can avoid excessive aeration of the oxidation ditch, can alternately form an aerobic/anoxic state in the aerobic tank, is beneficial to the superior growth of denitrifying phosphorus-accumulating bacteria and phosphorus-accumulating bacteria, can meet the synchronous nitrification and denitrification conditions, improves the effects of synchronous nitrification and denitrifying phosphorus removal, improves the total nitrogen and total phosphorus removal effects, can reduce the concentration of nitrate nitrogen in effluent of the oxidation ditch tank, reduces the concentration of dissolved oxygen and nitrate nitrogen in return sludge, avoids the anaerobic tank from excessively consuming endogenous carbon sources due to denitrification reaction, improves the phosphorus release effect of the phosphorus-accumulating bacteria in the anaerobic tank, and further improves the total nitrogen and total phosphorus removal effects of the oxidation ditch;
the invention adopts intermittent aeration, can save energy and carbon, saves the power consumption of an aeration system by more than 50 percent, can reduce the dosage of external carbon sources and phosphorus removal agents, and has obvious carbon emission reduction effect.
Drawings
FIG. 1 is a first control flow diagram of the present invention;
FIG. 2 is a second control flow diagram of the present invention;
fig. 3 is a schematic top view of the present invention.
In the figure, 1, an on-line ammonia nitrogen automatic analyzer; 2. an on-line automatic analyzer for nitrate nitrogen; 3. an on-line dissolved oxygen automatic analyzer; 4. a pre-anoxic tank; 5. an anaerobic tank; 6. an anoxic tank; 7. a submersible water impeller; 8. a first aerator; 9. a second aerator; 10. a submersible mixer; 11. an internal return gate; 12. a PLC control system; 13. a water outlet pipe; 14. a return sludge pipe; 15. a first sewage inlet pipe; 16. a sewage inlet pipe II; 17. an aerobic tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 3, an embodiment of the present invention provides a technical solution: a continuous flow intermittent aeration operation method for a surface aeration oxidation ditch process comprises the following steps:
s1: setting a detection object and a detection standard range, wherein the detection object is the dissolved oxygen concentration, the ammonia nitrogen concentration and the nitrate nitrogen concentration;
the dissolved oxygen level in the aerobic tank 17 not only relates to the power consumption, but also affects the denitrification and dephosphorization effect. The excessive concentration of the dissolved oxygen in the effluent of the oxidation ditch not only causes the waste of power consumption, but also causes the excessive concentration of the dissolved oxygen in the nitrification liquid flowing back to the anoxic tank 6, destroys the anoxic state of the anoxic tank 6 and influences the denitrification effect; the concentration of dissolved oxygen and the concentration of nitrate nitrogen in the returned sludge returned to the anaerobic tank 5 are too high, the anaerobic state of the anaerobic tank 5 is destroyed, carbon sources in sewage are consumed, and the phosphorus release reaction of phosphorus accumulating bacteria is influenced, so that the nitrogen and phosphorus removal effect of the oxidation ditch process is reduced. Therefore, the concentration of dissolved oxygen in the effluent of the oxidation ditch must be controlled.
The sludge reflux ratio of the oxidation ditch process is generally 50-100%. Researches show that the nitrate nitrogen content in the return sludge of the oxidation ditch process has great influence on the nitrogen and phosphorus removal effect, when the nitrate nitrogen concentration in the anaerobic tank 5 is higher than 5mg/L, the remarkable denitrification effect can be generated, the carbon source in the sewage is excessively consumed, and the denitrification carbon source of the subsequent process is insufficient; but also can affect the phosphorus release reaction of the phosphorus-accumulating bacteria in the anaerobic tank 5 and reduce the phosphorus removal effect of the oxidation ditch process. To control the nitrate nitrogen concentration in the return sludge, the nitrate nitrogen concentration in the effluent of the oxidation ditch must be controlled. If the sludge reflux ratio is 100 percent, the nitrate nitrogen concentration of the effluent of the oxidation ditch is controlled to be below 12mg/L if the nitrate concentration in the anaerobic tank 5 is controlled to be below 5 mg/L. Meanwhile, the nitrate nitrogen in the effluent of the oxidation ditch is too high, which also reflects that the oxidation ditch can have excessive aeration, thereby causing power consumption waste and deteriorating denitrification effect. Nitrate nitrogen can be used as a parameter for intermittent aeration control as a continuous flow.
Research shows that under the condition that the effluent reaches the standard, the nitrogen in the effluent of the oxidation ditch process sewage treatment plant has the following equation relationship: the total nitrogen is approximately equal to nitrate nitrogen, nitrite nitrogen and ammonia nitrogen, wherein the nitrite nitrogen concentration is very low and is generally below 1 mg/L. Therefore, the total nitrogen concentration can be judged according to the sum of the nitrate nitrogen concentration and the ammonia nitrogen concentration, such as: under the first-level B emission standard, when the sum of the nitrogen concentration of nitrate and the ammonia nitrogen concentration is close to 19mg/L, the total nitrogen possibly exceeds the standard; under the first-class A emission standard, when the sum of the nitrate nitrogen concentration and the ammonia nitrogen concentration is close to 14mg/L, the total nitrogen possibly exceeds the standard. Therefore, the sum of the nitrate nitrogen concentration and the ammonia nitrogen concentration can be used as a parameter for continuous flow intermittent aeration control, the adjustment time of the start/stop of the pre-aeration machine is used, and when the effluent of a sewage treatment plant executes the first-level standard A, the sum of the ammonia nitrogen concentration and the nitrate nitrogen concentration is less than or equal to 18mg/L and is used as an automatic control basis; when the effluent of the sewage treatment plant executes the first-level B standard, the sum of the ammonia nitrogen concentration and the nitrate nitrogen concentration is less than or equal to 13mg/L as the automatic control basis.
The detection standard range is that the concentration of dissolved oxygen is 0-3.0 mg/L, the concentration of ammonia nitrogen is 0-7 mg/L, the concentration of nitrate nitrogen is 0-12 mg/L, and the sum of the concentration of nitrate nitrogen and the concentration of ammonia nitrogen is 0-18 mg/L;
when the first-level A standard is executed, the ammonia nitrogen concentration is 0-4 mg/L, and the sum of the nitrate nitrogen concentration and the ammonia nitrogen concentration is 0-13 mg/L; when the first-level B standard is executed, the ammonia nitrogen concentration is 0-7 mg/L, and the sum of the nitrate nitrogen concentration and the ammonia nitrogen concentration is 0-18 mg/L; the primary A standard and the primary B standard are in the range specified in discharge Standard of pollutants for urban and urban Sewage treatment plants;
detecting the ammonia nitrogen concentration value of the effluent of the oxidation ditch by an online ammonia nitrogen automatic analyzer 1;
detecting the nitrate nitrogen concentration of the effluent of the oxidation ditch by an online nitrate nitrogen automatic analyzer 2;
detecting the dissolved oxygen concentration of the effluent of the oxidation ditch by an online dissolved oxygen automatic analyzer 3;
s2: setting the initial aeration period of a first aerator 8 and a second aerator 9 in an aerobic pool of the oxidation ditch, wherein the initial aeration period of the first aerator 8 is as follows:
s21: the first aerator and the second aerator are started to operate simultaneously for a first fixed time, named as T0, wherein the T0 is 30-60 min;
s22: stopping the second aerator, and stopping the first aerator after the first aerator continues to operate for a second fixed time, wherein the second fixed time is marked as T1, and the T1 is 30-150 min;
s23: and the first aerator are stopped simultaneously for a third fixed time and then started, wherein the third fixed time is recorded as T2, and the T2 is 60-180 min.
The initial aeration period, namely the aeration/aeration stopping period, is total aeration (1-3 h)/aeration stopping (1-3 h). Typical exposure/stop cycles are provided with over ten operating conditions: 1 h/1 h of exposure, 1 h/1.5 h of exposure, 1.5 h/2 h of exposure, 2 h/1.5 h of exposure, 2 h/1 h of exposure, 2.5 h/1.5 h of exposure, 2.5 h/2 h of exposure, 2.5 h/2.5 h of exposure, 3 h/1.5 h of exposure, 3 h/2 h of exposure, 3 h/2.5 h of exposure, 3 h/3 h of exposure, and the like. Specifically, which kind of working condition of the exposure/stop period is adopted for operation, and the working condition needs to be determined according to the water quality conditions of inlet and outlet water.
S3: detecting the effluent of the oxidation pond, comparing and analyzing the detection result with a preset detection standard range, and comparing and analyzing whether the detection result is in the detection standard range to obtain an analysis result; and the data comparison and analysis are carried out through an external control unit, and the control unit adopts a PLC control system 12.
S4: and adjusting the start and stop of the first aerator 8 and the second aerator 9 in real time according to the analysis result:
s41: when the detection result is within the detection standard range, the first aerator and the second aerator operate according to the initial aeration period, otherwise, start-stop of the first aerator and the second aerator are adjusted in real time and S3 is returned, if the detection result is within the detection standard, the first aerator 8 and the second aerator 9 operate according to the initial aeration period, otherwise, start-stop of the first aerator 8 and the second aerator 9 are dynamically adjusted in real time, when the first aerator 8 operates and the second aerator 9 stops, when the dissolved oxygen concentration is lower than 3.0mg/L or the ammonia nitrogen concentration is higher than 1.0mg/L or the nitrate nitrogen is lower than 12mg/L, the first aerator 8 operates for a first fixed time and then stops, otherwise, the first aerator 8 stops;
when the first aerator 8 and the second aerator 9 are both stopped, when the effluent of the sewage treatment plant executes the first-level A standard, when the ammonia nitrogen concentration is lower than 4mg/L or the sum of the ammonia nitrogen concentration and the nitrate nitrogen concentration is lower than 13mg/L (when the effluent of the sewage treatment plant executes the first-level B standard, when the ammonia nitrogen concentration is lower than 7mg/L or the sum of the ammonia nitrogen concentration and the nitrate nitrogen concentration is lower than 18 mg/L), the first aerator 8 and the second aerator 9 are both stopped to a second fixed time and then started simultaneously, otherwise, the first aerator 8 and the second aerator 9 are started simultaneously, and intelligent control is performed according to an analysis result, so that the aerobic tank 17 operates in an optimal state according to continuous flow intermittent aeration, and then the operation returns to S3 for circulation.
The measured value of the on-line ammonia nitrogen automatic analyzer 1 is recorded as
Figure 714041DEST_PATH_IMAGE001
The measured values of the on-line automatic nitrate nitrogen analyzer 22 are recorded as
Figure 238564DEST_PATH_IMAGE002
Recording the measured value of the on-line automatic dissolved oxygen analyzer 3 as DO, and recording the total amount of ammonia nitrogen and nitrate nitrogen as DO
Figure 258472DEST_PATH_IMAGE001
+
Figure 136430DEST_PATH_IMAGE002
。
The whole oxidation ditch comprises a pre-anoxic pond 4, an anaerobic pond 5, an anoxic pond 6 and an aerobic pond 17 which are sequentially communicated, wherein one side of the pre-anoxic pond 4 is provided with a sewage inlet pipe 15, a return sludge pipe 14, a diving stirrer 10 is further arranged, one side of the anaerobic pond 5 is provided with a sewage inlet pipe two 16, a plurality of diving stirrers 10 are further arranged, the anaerobic pond 5 is a gallery type pond body, the adjacent two diving stirrers 10 are reversely turned, the anoxic pond 6 is a runway type pond body, a plurality of diving flow pushers 7 are arranged in the anoxic pond 6 and the aerobic pond 17, a first aerator 8 and a second aerator 9 are further arranged in the aerobic pond 17, the first aerator 8 and the second aerator 9 are inverted umbrella-shaped surface aerators, a water outlet well is arranged at a water outlet of the aerobic pond 17, and the water outlet well is communicated with a water outlet pipe 13. The anoxic tank 6 and the aerobic tank 17 are provided with two communicating channels, sewage enters the aerobic tank 17 from the anoxic tank 6 through the first channel, nitrified liquid can enter the anoxic tank 6 from the aerobic tank 17 through the second channel, the second channel is provided with an internal reflux door 11, and the reflux quantity of the nitrified liquid can be controlled through the opening and closing degree of the internal reflux door 11.
The working principle of the invention is as follows: the pretreated sewage is divided into two paths which respectively enter the pre-anoxic tank 4 and the anaerobic tank 5 through a sewage inlet pipe I15 and a sewage inlet pipe II 16, and the return sludge enters the pre-anoxic tank 4 through a return sludge pipe 14. The sewage and the return sludge are fully mixed and then sequentially pass through the pre-anoxic tank 4, the anaerobic tank 5, the anoxic tank 6 and the aerobic tank 17, and then flow into the secondary sedimentation tank through the water outlet pipe 13 to carry out solid-liquid shunting. The anoxic tank 6 is communicated with the aerobic tank 17 through an internal return gate 11, and the nitrified liquid in the aerobic tank 17 can enter the anoxic tank 6 through the internal return gate 11. According to the traditional operation method, the aerobic tank 17 operates in a continuous aeration mode, pre-denitrification is carried out in the pre-anoxic tank 4, phosphorus release of phosphorus accumulating bacteria is carried out in the anaerobic tank 5, pre-denitrification is carried out in the anoxic tank 6, and nitrification is carried out in the aerobic tank 17 to remove ammonia nitrogen and organic matters.
2 inverted umbrella surface aerators are arranged in the aerobic tank 17, 1 online ammonia nitrogen automatic analyzer 1 and 1 online nitrate nitrogen automatic analyzer 2 are arranged at the water outlet. The front end of the water outlet of the aerobic tank 17 is provided with 1 on-line dissolved oxygen automatic analyzer 3. The equipment and the instruments are connected with an electric control signal of a PLC control system 12 of a central control room, and the automatic start and stop of 2 inverted umbrella aeration machines (a first aeration machine 8 and a second aeration machine 9) are intelligently controlled through the PLC control system 12.
Referring to FIGS. 2 and 3, the scale of a municipal wastewater treatment plant in a domestic town is 4 ten thousand meters 3 The effluent meets the first-class B standard of pollutant discharge Standard of urban and urban Sewage treatment plant, the core process is carrousel 2000 type oxidation ditch, the plant has 4 groups of oxidation ditches, and each group is 1 ten thousand meters 3 The attached FIG. 3 shows 1 group of oxidation ditches in this example.
Based on the water quality condition of the inlet water of the plant, the aeration/stop aeration period is set as follows: exposure is carried out for 2 h/stop for 2h. When the aeration is started, the first aerator 8 and the second aerator 9 are started simultaneously, after 30min, the second inverted umbrella aerator is stopped, and the first aerator 8 is continuously started to operate for 2h; after 2h, the first aerator 8 stops running, and the aerobic tank 17 enters an anoxic state in which aeration is stopped. In general, the aerobic tank 17 is operated cyclically according to the aeration/non-aeration period.
The whole circulation process is operated according to the flow chart of fig. 2.
As the water inlet amount and the water quality of the sewage treatment plant fluctuate, the water quality of the effluent of the oxidation ditch fluctuates accordingly. Thus, the parameters monitored by the on-line monitoring device intelligently control the start/stop of the first aerator 8 and the second aerator 9:
in the aeration stage, when the concentration of the dissolved oxygen at the water outlet of the oxidation ditch is higher than 3.0mg/L, the first aerator 8 and the second aerator 9 are stopped, the aeration is stopped, and the aeration time is shortened.
In the aeration stage, when the ammonia nitrogen concentration of the effluent of the oxidation ditch is lower than 1mg/L, the first aerator 8 and the second aerator 9 are stopped, the aeration is stopped, and the aeration time is shortened; and in the aeration stopping stage, when the ammonia nitrogen concentration of the effluent of the oxidation ditch is higher than 7mg/L, starting the first aerator 8 and the second aerator 9 to shorten the aeration stopping time.
In the aeration period, when the nitrate nitrogen in the effluent of the oxidation ditch is higher than 12mg/L, the denitrification effect of the oxidation ditch is reduced, the first aerator 8 and the second aerator 9 are stopped, the aeration is stopped, and the aeration time is shortened.
In the aeration stopping stage, when the sum of the nitrate nitrogen concentration and the ammonia nitrogen concentration of the effluent of the oxidation ditch is higher than 18mg/L, the nitrification reaction of the oxidation ditch is insufficient, the total nitrogen risks exceeding the standard, and the first aerator 8 and the second aerator 9 are started to shorten the aeration stopping time.
Through the implementation of continuous flow intermittent aeration of the oxidation ditch process for about 1 year, compared with the ton water energy consumption of the previous 1 year (running in a continuous aeration mode), the power consumption of the oxidation ditch aeration system is reduced by about 58 percent, and the total power consumption of a sewage treatment plant is from 0.245kWh/m 3 The water is reduced to 0.164kWh/m 3 Water, 33% reduction. The total nitrogen removal rate is improved by 11.9 percent, and the total phosphorus removal rate is improved by 12.4 percent.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (2)

1. A continuous flow intermittent aeration operation method for a surface aeration oxidation ditch process is characterized by comprising the following steps:
s1: setting a detection object and a detection standard range, wherein the detection object is the dissolved oxygen concentration, the ammonia nitrogen concentration and the nitrate nitrogen concentration;
the detection standard range is that the concentration of dissolved oxygen is 0-3.0 mg/L, the concentration of ammonia nitrogen is 0-7 mg/L, the concentration of nitrate nitrogen is 0-12 mg/L, and the sum of the concentration of nitrate nitrogen and the concentration of ammonia nitrogen is 0-18 mg/L;
s2: setting the initial aeration period of a first aerator and a second aerator in an aerobic tank of an oxidation ditch:
s21: the first aerator and the second aerator are started and operated at the same time for a first fixed time, named T0, wherein the T0 is 30-60 min;
s22: stopping the second aerator, and stopping the first aerator after the first aerator continues to operate for a second fixed time, wherein the second fixed time is marked as T1, and the T1 is 30-150 min;
s23: stopping the first aerator and the second aerator at the same time for a third fixed time, and starting the first aerator and the second aerator, wherein the third fixed time is marked as T2, and the T2 is 60-180 min;
s3: detecting the effluent of the oxidation pond, and comparing and analyzing the detection result with a preset detection standard range to obtain an analysis result;
s4: adjusting the start and stop of the first aerator and the second aerator in real time according to the analysis result:
s41: when the detection result is within the detection standard range, the first aerator and the second aerator operate according to the initial aeration period, otherwise, the start and stop of the first aerator and the second aerator are adjusted in real time and S3 is returned, when the first aerator operates and the second aerator stops, the first aerator operates for a first fixed time and stops when the dissolved oxygen concentration is lower than 3.0mg/L or the ammonia nitrogen concentration is higher than 1.0mg/L or the nitrate nitrogen is lower than 12mg/L, otherwise, the first aerator stops;
when the first aerator and the second aerator are both stopped, when the ammonia nitrogen concentration is lower than 7mg/L or the sum of the ammonia nitrogen concentration and the nitrate nitrogen concentration is lower than 18mg/L, the first aerator and the second aerator are both stopped until the second fixed time and then started at the same time, otherwise, the first aerator and the second aerator are started at the same time.
2. The continuous flow intermittent aeration operation method for the surface aeration oxidation ditch process according to the claim 1, characterized in that the ammonia nitrogen concentration value of the effluent of the oxidation ditch is detected by an on-line ammonia nitrogen automatic analyzer;
detecting the nitrate nitrogen concentration of the effluent of the oxidation ditch by an online nitrate nitrogen automatic analyzer;
and detecting the dissolved oxygen concentration of the effluent of the oxidation ditch by an online dissolved oxygen automatic analyzer.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008260002A (en) * 2007-04-16 2008-10-30 Tsurumi Mfg Co Ltd Operation control method for aeration apparatus
CN101456626A (en) * 2008-12-22 2009-06-17 安徽国祯环保节能科技股份有限公司 A<2>/O oxidation ditch process operation control method
CN104710010A (en) * 2015-04-01 2015-06-17 武汉理工大学 Real-time AAO oxidation ditch regulation system and sewage treatment method thereof
CN109809563A (en) * 2019-03-25 2019-05-28 张庆五 A kind of sewage water treatment method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008260002A (en) * 2007-04-16 2008-10-30 Tsurumi Mfg Co Ltd Operation control method for aeration apparatus
CN101456626A (en) * 2008-12-22 2009-06-17 安徽国祯环保节能科技股份有限公司 A<2>/O oxidation ditch process operation control method
CN104710010A (en) * 2015-04-01 2015-06-17 武汉理工大学 Real-time AAO oxidation ditch regulation system and sewage treatment method thereof
CN109809563A (en) * 2019-03-25 2019-05-28 张庆五 A kind of sewage water treatment method

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