CN112340947B - Sewage denitrification and dephosphorization regulating system and regulating method thereof - Google Patents
Sewage denitrification and dephosphorization regulating system and regulating method thereof Download PDFInfo
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- 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
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- 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
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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- 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
Abstract
The invention relates to a sewage denitrification and dephosphorization regulating system and a regulating method thereof, wherein various sensors connected with a signal processor are arranged in a denitrification and dephosphorization process flow to monitor real-time data of various factors influencing denitrification and dephosphorization effects, the monitored data are transmitted to the signal processor, the signal processor transmits received signals to a central controller, and the central controller regulates each denitrification and dephosphorization flow according to the received data; the invention realizes the adjustment of the denitrification and dephosphorization process flow and enhances the denitrification and dephosphorization effect.
Description
Technical Field
The invention belongs to the field of sewage discharge, and particularly relates to a sewage denitrification and dephosphorization regulating system and a regulating method thereof.
Background
The source of life-water is a natural resource for animals and plants to survive, and is an essential material basis for economic development. The earth surface is covered by water, fresh water resources only account for 2.5% of all water resources, nearly 70% of fresh water resources are fixed in the two-stage ice layers, and the other part is soil moisture and deep groundwater, so that only about 0.26% of water can be directly utilized by us. The total water resource of China is 2.8 trillion cubic meters, and the water resource is in the sixth world, but due to the population, people are only one fourth of the world. Along with the rapid development of the economy in China, the continuous expansion of the urban scale, the continuous growth of population and the increasing of living standard, the demand for water resources is also rapidly increased. The discharge of domestic wastewater and industrial wastewater is increased, which aggravates the contradiction of water resource shortage. It is known that domestic sewage discharged by China every year is at least 1 trillion cubic meters, but the sewage treatment rate is less than 50%, so that 90% of urban water bodies are destroyed, the water quality is deteriorated, and the life safety of animals and plants is seriously endangered, so that the sewage treatment force is enhanced, the sewage treatment scale is enlarged, and the sewage treatment efficiency is improved.
Denitrification and dephosphorization and organic matter degradation are important points of sewage treatment. In the existing sewage treatment, phosphorus removal is carried out by two methods of chemical phosphorus removal and biological phosphorus removal, wherein the chemical phosphorus removal is carried out by chemical adsorption or chemical precipitation. Chemical precipitation refers to the process of adding inorganic metal salt agents into sludge or releasing iron ions by an electrolytic iron plate, forming granular and insoluble substances after mixing with soluble phosphate in sewage, and removing phosphorus in the sludge by precipitation. Biological dephosphorization is a relatively economical dephosphorization method, when sewage is treated by an activated sludge method, activated sludge is alternately operated in anaerobic and aerobic states, so that phosphorus accumulating bacteria accumulating excessive phosphate can grow predominantly, and the phosphorus content of the activated sludge is higher than that of common activated sludge. Phosphorus accumulating bacteria in the sludge release phosphorus in an anaerobic state and take up phosphorus excessively in an aerobic state. As a result, more phosphorus in the sewage can be removed by discharging the phosphorus-rich excess sludge compared with the ordinary activated sludge process. Because of the characteristics of high treatment rate, low running cost, simple operation and the like, the activated sludge process becomes one of the common methods for urban domestic sewage treatment. The denitrification and dephosphorization and COD removal are realized through the nitrification-denitrification process, so that a large proportion of sludge reflux and large air quantity aeration are required in the whole process flow to ensure the sludge concentration and the oxygen supply, and the energy consumption in the process is increased; the process flow is long and the control condition is complex; the system returns a large amount of sludge, a large amount of nitrate can be brought back to the anaerobic tank, the phosphorus-accumulating bacteria release phosphorus under the anaerobic state and have the existence of dissolved BOD, when a large amount of nitrate exists, denitrifying bacteria can perform denitrification by taking organic matters as carbon sources, and the anaerobic release of phosphorus can be started after denitrification is complete, so that the effective volume for performing anaerobic release of phosphorus in the anaerobic stage is greatly reduced, the effect of phosphorus removal is reduced, and compared with the prior art, the denitrification effect is better; on the contrary, if the nitrification in the aerobic section is poor, the nitrate amount entering the anaerobic section along with the return sludge is reduced, so that the phosphorus is fully released anaerobically, and the dephosphorization effect is improved, but the denitrification effect is poor due to incomplete nitrification.
In a word, in the existing biological denitrification and dephosphorization process, sludge consists of nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria, and circulates among an anaerobic section, an anoxic section and an aerobic section, and because the optimal growth environments of different microorganisms are different, contradictions often exist between biological denitrification and biological dephosphorization, such as different distribution ratios of the sludge amount of the anaerobic section and the anoxic section, competing for carbon sources, different sludge ages and the like, and the situation that denitrification and dephosphorization are difficult to achieve optimal effects simultaneously easily occurs in the actual sewage treatment process.
Disclosure of Invention
Based on the problem that the sewage treatment in the prior art is difficult to achieve the optimal effect, the invention provides a sewage denitrification and dephosphorization regulating system and a regulating method thereof, which are used for monitoring sewage data in real time by arranging various sensors for influencing factors of denitrification and dephosphorization effects, regulating the sewage treatment by a central controller according to monitoring results of various sensors, and improving the sewage treatment effect.
The invention has the following specific implementation contents:
a sewage denitrification and dephosphorization regulating system comprises a denitrification and dephosphorization device, a heavy metal sensor, a PH sensor, an alkali liquor tank, an acid liquor tank, a TKN sensor, a COD sensor, a temperature sensor, a first consumption sensor, a second consumption sensor, a DO sensor, a signal processor and a central controller; the denitrification and dephosphorization device comprises a sludge return pipe, a water outlet return pipe, and a primary sedimentation tank, an adjusting tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a biomembrane reaction tank and a water outlet tank which are sequentially connected by a water pump; the sludge return pipe is connected between the secondary sedimentation tank and the anaerobic tank, and the water outlet return pipe is connected between the biomembrane reaction tank and the anoxic tank;
the heavy metal sensor is connected with the signal processor and is arranged in the regulating tank;
the PH sensor is connected with the signal processor and is arranged in the regulating tank;
the alkali liquor tank and the acid liquor tank are respectively connected with the regulating tank through pipelines; the pipeline is provided with a control switch which is connected with the central controller;
the TKN sensor is connected with the signal processor and is arranged in the regulating tank;
the COD sensor is connected with the signal processor and is respectively arranged in the aerobic tank, the anaerobic tank and the anoxic tank;
the first consumption sensor is connected with the signal processor and is arranged between the regulating tank and the anaerobic tank; the method comprises the steps of carrying out a first treatment on the surface of the
The second consumption sensor is connected with the signal processor and is arranged at the input end of the water outlet pool;
the DO sensor is connected with the signal processor and is respectively arranged in the aerobic tank, the anaerobic tank and the anoxic tank;
the temperature sensor is connected with the signal processor and is respectively arranged in the aerobic tank, the anaerobic tank and the anoxic tank;
the signal processor is arranged outside the denitrification and dephosphorization device and is connected with the central processing unit;
the water pump is connected with the central processing unit.
In order to better implement the invention, further, the first and second consumption sensors are turbine consumption sensors; the PH sensor is an extended gate transistor PH sensor.
In order to better realize the invention, the device further comprises a stirrer and an aeration pipe which are connected with the central controller; the stirrer is respectively arranged at the bottoms of the anaerobic tank, the anoxic tank and the aerobic tank; the aeration pipes are respectively arranged at the bottoms of the anaerobic tank, the anoxic tank and the aerobic tank.
In order to better implement the invention, the signal processor further comprises an a/D conversion module.
The sewage denitrification and dephosphorization regulation method is based on the denitrification and dephosphorization regulation system and specifically comprises the following steps:
s1, discharging sewage into a primary sedimentation tank, and primarily filtering large-particle impurities and organic matters;
s2, discharging the filtered sewage into an adjusting tank, detecting the PH value of the filtered sewage by using a PH sensor in the adjusting tank, transmitting detected electric signals to a signal processor by the PH sensor, transmitting the detected electric signals to a central controller by the signal processor, and controlling an alkali liquor tank and/or an acid liquor tank to put a medicament into the pH for adjustment by the central controller according to the detected PH value;
s3, after PH adjustment, discharging the sewage into an anaerobic tank for phosphorus release by phosphorus accumulating bacteria and degradation of organic matters, and then discharging the sewage into an anoxic tank;
s4, denitrifying the sewage sent into the anoxic tank by using heterotrophic facultative denitrifying bacteria, and then discharging the denitrified sewage into the aerobic tank;
s5, nitrifying ammonia nitrogen and degrading organic matters in the sewage discharged into the aerobic tank, and performing excessive phosphorus absorption through phosphorus accumulating bacteria, and then discharging the sewage into a secondary sedimentation tank;
s6, performing mud-water separation on sewage discharged into the secondary sedimentation tank, discharging a part of separated sludge as surplus sludge, conveying a part of separated sludge back to the anaerobic tank through a sludge return pipe, separating supernatant fluid, conveying effluent containing nitrate after passing through a biomembrane reaction tank back to the anoxic tank through a water outlet return pipe, and discharging the rest of effluent through the water outlet tank.
In order to better realize the invention, the dissolved oxygen content in the anaerobic tank, the anoxic tank and the aerobic tank is further monitored by the DO sensor, and the detection result is transmitted to the signal processor, and the signal processor converts the electric signal into a binary signal and transmits the binary signal to the central controller for analysis.
In order to better realize the invention, further, after analyzing the dissolved oxygen signals in the anaerobic tank, the anoxic tank and the aerobic tank, the central controller realizes the adjustment of the dissolved oxygen content in the anaerobic tank, the anoxic tank and the aerobic tank by controlling the power of the aeration pipe, and the specific adjustment principle is as follows:
if the content of the dissolved oxygen in the anaerobic tank is more than or equal to 0.2mg/L, the power of the aeration pipe is reduced, otherwise, the power is kept unchanged;
if the content of the dissolved oxygen in the anoxic tank is more than or equal to 0.5mg/L, the power of the aeration pipe is reduced, otherwise, the power is kept unchanged;
if the dissolved oxygen content in the aerobic tank is between 2 and 3mg/L, the oxygen content is kept unchanged, if the oxygen content is smaller than 2mg/L, the power of the aeration pipe is increased, and if the oxygen content is larger than 3mg/L, the power of the aeration pipe is reduced.
In order to better realize the invention, further, the water inflow of the sewage is calculated through a first consumption sensor, and the water outflow of the sewage is calculated through a second consumption sensor; the temperature in the anaerobic tank, the anoxic tank and the aerobic tank is monitored by the temperature sensor.
In order to better realize the invention, a central controller is further used for carrying out real-time data analysis and feedback treatment on sewage treatment by adopting PLC closed-loop control according to signals transmitted by a COD sensor, a PH sensor, a DO sensor, a temperature sensor, a heavy metal sensor, a first consumption sensor and a second consumption sensor.
In order to better realize the invention, further, the central controller controls the power of the water pump to realize the residence time of sewage among the processes through the data analysis result; the specific adjusting range is as follows:
the sewage retention time of the anaerobic tank is between 0.5 and 2.5 hours;
the sewage retention time of the anoxic tank is between 0.5 and 2.5 hours;
the sewage retention time of the aerobic tank is between 2 and 10 hours.
Compared with the prior art, the invention has the following advantages:
1) The monitoring of each flow of denitrification and dephosphorization is realized, and the denitrification and dephosphorization effect is improved;
2) The heavy metal sensor is added, so that the damage to microorganisms caused by the excessive heavy metal content in the sewage is avoided;
3) And a temperature sensor is added to ensure that the microorganism is at the optimal reaction temperature.
Drawings
FIG. 1 is a schematic diagram of the connection of each flow path of a denitrification and dephosphorization device;
FIG. 2 is a flow chart of pH adjustment;
FIG. 3 is a flow chart for regulating the oxygen content of an anaerobic tank;
FIG. 4 is a flow chart for oxygen content regulation in an anoxic tank;
FIG. 5 is a flow chart for regulating oxygen content of an aerobic tank;
FIG. 6 is a schematic diagram of a CPU adjustment flow.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions of 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, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments, and therefore should not be considered as limiting the scope of protection. All other embodiments, which are obtained by a worker of ordinary skill in the art without creative efforts, are within the protection scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; or may be directly connected, or may be indirectly connected through an intermediate medium, or may be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1:
a sewage denitrification and dephosphorization regulating system is shown in figure 1, and comprises a denitrification and dephosphorization device, a heavy metal sensor, a PH sensor, an alkali liquor tank, an acid liquor tank, a TKN sensor, a COD sensor, a temperature sensor, a first consumption sensor, a second consumption sensor, a DO sensor, a stirrer, an aerator pipe, a signal processor and a central controller; the denitrification and dephosphorization device comprises a sludge return pipe, a water outlet return pipe, and a primary sedimentation tank, an adjusting tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a biomembrane reaction tank and a water outlet tank which are sequentially connected by a water pump; the sludge return pipe is connected between the secondary sedimentation tank and the anaerobic tank, and the water outlet return pipe is connected between the biomembrane reaction tank and the anoxic tank;
the heavy metal sensor is connected with the signal processor and is arranged in the regulating tank;
the PH sensor is connected with the signal processor and is arranged in the regulating tank; the PH sensor is an extended grid type transistor PH sensor;
the alkali liquor tank and the acid liquor tank are respectively connected with the regulating tank through pipelines; the pipeline is provided with a control switch which is connected with the central controller;
the TKN sensor is connected with the signal processor and is arranged in the regulating tank;
the COD sensor is connected with the signal processor and is respectively arranged in the aerobic tank, the anaerobic tank and the anoxic tank;
the first consumption sensor is connected with the signal processor and is arranged between the regulating tank and the anaerobic tank; the second consumption sensor is connected with the signal processor and is arranged at the input end of the water outlet pool; the first consumption sensor and the second consumption sensor are turbine consumption sensors; the first consumption sensor is arranged between the regulating tank and the anaerobic tank, the regulating tank is connected with the anaerobic tank by a water pump, and the first consumption sensor can be arranged in a water inlet pipe of the water pump connecting the regulating tank and the anaerobic tank and also in a water outlet pipe of the water pump.
The DO sensor is connected with the signal processor and is respectively arranged in the aerobic tank, the anaerobic tank and the anoxic tank;
the temperature sensor is connected with the signal processor and is respectively arranged in the aerobic tank, the anaerobic tank and the anoxic tank;
the signal processor is arranged outside the denitrification and dephosphorization device and comprises an A/D conversion module connected with the central processing unit;
the stirrer and the aeration pipe are connected with the central controller and are arranged at the bottoms of the anaerobic tank, the anoxic tank and the aerobic tank;
the water pump is connected with the central processing unit.
Example 2:
in another aspect of the invention, a sewage denitrification and dephosphorization regulation method is based on the denitrification and dephosphorization regulation system, as shown in fig. 2, specifically comprising the following steps:
s1, discharging sewage into a primary sedimentation tank, and primarily filtering large-particle impurities and organic matters;
s2, discharging the filtered sewage into an adjusting tank, detecting the PH value of the filtered sewage by using a PH sensor in the adjusting tank, transmitting detected electric signals to a signal processor by the PH sensor, transmitting the detected electric signals to a central controller by the signal processor, and controlling an alkali liquor tank and/or an acid liquor tank to put a medicament into the pH for adjustment by the central controller according to the detected PH value;
s3, after PH adjustment, discharging the sewage into an anaerobic tank for phosphorus release by phosphorus accumulating bacteria and degradation of organic matters, and then discharging the sewage into an anoxic tank;
s4, denitrifying the sewage sent into the anoxic tank by using heterotrophic facultative denitrifying bacteria, and then discharging the denitrified sewage into the aerobic tank;
s5, nitrifying ammonia nitrogen and degrading organic matters in the sewage discharged into the aerobic tank, and performing excessive phosphorus absorption through phosphorus accumulating bacteria, and then discharging the sewage into a secondary sedimentation tank;
s6, performing mud-water separation on sewage discharged into the secondary sedimentation tank, discharging a part of separated sludge as surplus sludge, conveying a part of separated sludge back to the anaerobic tank through a sludge return pipe, separating supernatant fluid, conveying effluent containing nitrate after passing through a biomembrane reaction tank back to the anoxic tank through a water outlet return pipe, and discharging the rest of effluent through the water outlet tank.
Working principle: after filtering large-particle impurities through the primary sedimentation tank, discharging sewage into the regulating tank, arranging a PH sensor in the regulating tank, detecting the PH value of the sewage through the PH sensor, wherein the PH value has great influence on microorganisms in each subsequent stage, comprehensively considering that the PH value is most suitable between 6.5 and 7.5, if the detected PH value is not in the range, the PH value of the sewage needs to be regulated by throwing alkali liquor or acid liquor into an alkali liquor tank and an acid liquor tank, and then delivering the sewage into a subsequent process for denitrification and dephosphorization.
Other portions of this embodiment are the same as those of embodiment 1 described above, and thus will not be described again.
Example 3:
in order to better realize the invention based on any one of the embodiments 1-2, the dissolved oxygen content in the anaerobic tank, the anoxic tank and the aerobic tank is monitored by the DO sensor, and the detected result is transmitted to the signal processor, and the signal processor converts the electric signal into a binary signal and transmits the binary signal to the central controller for analysis.
Working principle: in the process flow, the dissolved oxygen content has great influence on the reaction of each stage, and because the oxygen requirements of each stage are different, a plurality of groups of DO sensors are required to be arranged for monitoring the dissolved oxygen content in the anaerobic tank, the anoxic tank and the aerobic tank.
Other portions of this embodiment are the same as any of embodiments 1-2 described above, and thus will not be described again.
Example 4:
on the basis of any one of the above embodiments 1 to 3, in order to better implement the present invention, as shown in fig. 3, 4 and 5, further, after analyzing the dissolved oxygen signals in the anaerobic tank, the anoxic tank and the aerobic tank, the central controller controls the power of the aeration pipe to implement the adjustment of the dissolved oxygen content in the anaerobic tank, the anoxic tank and the aerobic tank, and the specific adjustment principle is as follows:
if the content of the dissolved oxygen in the anaerobic tank is more than or equal to 0.2mg/L, the power of the aeration pipe is reduced, otherwise, the power is kept unchanged;
if the content of the dissolved oxygen in the anoxic tank is more than or equal to 0.5mg/L, the power of the aeration pipe is reduced, otherwise, the power is kept unchanged;
if the dissolved oxygen content in the aerobic tank is between 2 and 3mg/L, the oxygen content is kept unchanged, if the oxygen content is smaller than 2mg/L, the power of the aeration pipe is increased, and if the oxygen content is larger than 3mg/L, the power of the aeration pipe is reduced.
Working principle: the high dissolved oxygen content and the excessive shearing of sludge flocs can cause poor sedimentation, and the low DO concentration can cause incomplete nitrification of ammonia nitrogen in the aerobic tank, and after comprehensive consideration, the dissolved oxygen content in the aerobic tank is between 2 and 3mg/L, the dissolved oxygen content in the anaerobic tank is less than 0.2mg/L, and the dissolved oxygen content in the anoxic tank is less than 0.5 mg/L.
Other portions of this embodiment are the same as any of embodiments 1 to 3 described above, and thus will not be described again.
Example 5:
on the basis of any one of the above embodiments 1 to 4, in order to better realize the present invention, further, the water inflow amount of the sewage is calculated by a first consumption sensor, and the water outflow amount of the sewage is calculated by a second consumption sensor; the temperature in the anaerobic tank, the anoxic tank and the aerobic tank is monitored by the temperature sensor.
Working principle: the first consumption sensor and the second consumption sensor can monitor the water yield and the water inflow in the denitrification and dephosphorization process flow.
Other portions of this embodiment are the same as any of embodiments 1 to 4 described above, and thus will not be described again.
Example 6:
in order to better realize the invention based on any one of the above embodiments 1 to 5, as shown in fig. 6, further, a central controller is used to perform real-time data analysis and feedback processing on sewage treatment according to signals transmitted by a COD sensor, a PH sensor, a DO sensor, a temperature sensor, a heavy metal sensor, a first consumption sensor and a second consumption sensor by adopting PLC closed loop control.
Working principle: the central controller analyzes the denitrification and dephosphorization flow through the data transmitted by various sensors, and adjusts the corresponding parts according to the analysis result; for example, when the heavy metal content of the signals transmitted by the heavy metal sensor exceeds the standard, the central controller turns off the water pump between the regulating tank and the anaerobic tank, so that the sewage with the exceeding heavy metal content is prevented from flowing into the subsequent steps, and a large amount of microorganisms are killed; when the temperature is more than 10-25 ℃, the central controller can adjust the temperature; when the data transmitted by the first consumption sensor and the second consumption sensor indicate that the water inflow or the water outflow is too large or too low, the central controller can also properly adjust the power of the water pump in each link to adjust the residence time, the water outflow, the water inflow and the like of the sewage in each flow.
Other portions of this embodiment are the same as any of embodiments 1 to 5 described above, and thus will not be described again.
Example 7:
on the basis of any one of the above embodiments 1 to 6, in order to better implement the present invention, further, the central controller controls the power of the water pump to implement the residence time of the sewage between each process by the data analysis result; the specific adjusting range is as follows:
the sewage retention time of the anaerobic tank is between 0.5 and 2.5 hours;
the sewage retention time of the anoxic tank is between 0.5 and 2.5 hours;
the sewage retention time of the aerobic tank is between 2 and 10 hours.
Other portions of this embodiment are the same as any of embodiments 1 to 6 described above, and thus will not be described again.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.
Claims (5)
1. A sewage denitrification and dephosphorization regulation method is operated based on a sewage denitrification and dephosphorization regulation system and is characterized in that,
the sewage denitrification and dephosphorization regulating system comprises a denitrification and dephosphorization device, a heavy metal sensor, a pH sensor, an alkali liquor tank, an acid liquor tank, a TKN sensor, a COD sensor, a temperature sensor, a first consumption sensor, a second consumption sensor, a DO sensor, a signal processor and a central controller; the denitrification and dephosphorization device comprises a sludge return pipe, a water outlet return pipe, and a primary sedimentation tank, an adjusting tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a biomembrane reaction tank and a water outlet tank which are sequentially connected by a water pump; the sludge return pipe is connected between the secondary sedimentation tank and the anaerobic tank, and the water outlet return pipe is connected between the biomembrane reaction tank and the anoxic tank;
the heavy metal sensor is connected with the signal processor and is arranged in the regulating tank;
the pH sensor is connected with the signal processor and is arranged in the regulating tank;
the alkali liquor tank and the acid liquor tank are respectively connected with the regulating tank through pipelines; the pipeline is provided with a control switch which is connected with the central controller;
the TKN sensor is connected with the signal processor and is arranged in the regulating tank;
the COD sensor is connected with the signal processor and is respectively arranged in the aerobic tank, the anaerobic tank and the anoxic tank;
the first consumption sensor is connected with the signal processor and is arranged between the regulating tank and the anaerobic tank;
the second consumption sensor is connected with the signal processor and is arranged at the input end of the water outlet pool;
the DO sensor is connected with the signal processor and is respectively arranged in the aerobic tank, the anaerobic tank and the anoxic tank;
the temperature sensor is connected with the signal processor and is respectively arranged in the aerobic tank, the anaerobic tank and the anoxic tank;
the signal processor is arranged outside the denitrification and dephosphorization device and is connected with the central processing unit;
the water pump is connected with the central processing unit;
the adjusting method specifically comprises the following steps:
s1, discharging sewage into a primary sedimentation tank, and primarily filtering large-particle impurities and organic matters;
s2, discharging the filtered sewage into an adjusting tank, detecting the pH value of the filtered sewage by using a pH sensor in the adjusting tank, transmitting detected electric signals to a signal processor by the pH sensor, transmitting the detected electric signals to a central controller by the signal processor, and controlling an alkali liquor tank and/or an acid liquor tank to put a medicament into the pH for adjusting by the central controller according to the detected pH value;
s3, after pH adjustment, discharging the sewage into an anaerobic tank for phosphorus release by phosphorus accumulating bacteria and degradation of organic matters, and then discharging the sewage into an anoxic tank;
s4, denitrifying the sewage sent into the anoxic tank by using heterotrophic facultative denitrifying bacteria, and then discharging the denitrified sewage into the aerobic tank;
s5, nitrifying ammonia nitrogen and degrading organic matters in the sewage discharged into the aerobic tank, and performing excessive phosphorus absorption through phosphorus accumulating bacteria, and then discharging the sewage into a secondary sedimentation tank;
s6, performing mud-water separation on sewage discharged into a secondary sedimentation tank, discharging a part of separated sludge as surplus sludge, conveying a part of the sludge back to the anaerobic tank through a sludge return pipe, separating supernatant fluid, conveying effluent containing nitrate after passing through a biomembrane reaction tank, conveying the effluent back to an anoxic tank through a water outlet return pipe, and discharging the rest of effluent through the water outlet tank;
a central controller adopts PLC closed-loop control, and real-time data analysis and feedback treatment are carried out on sewage treatment according to signals transmitted by a COD sensor, a pH sensor, a DO sensor, a temperature sensor, a heavy metal sensor, a first consumption sensor and a second consumption sensor;
the DO sensor is used for monitoring the content of dissolved oxygen in the anaerobic tank, the anoxic tank and the aerobic tank, and transmitting the detection result electric signals to the signal processor, and the signal processor is used for converting the electric signals into binary signals and transmitting the binary signals to the central controller for analysis;
after analyzing dissolved oxygen signals in the anaerobic tank, the anoxic tank and the aerobic tank, the central controller realizes the adjustment of the dissolved oxygen content in the anaerobic tank, the anoxic tank and the aerobic tank by controlling the power of the aeration pipe, and the specific adjustment principle is as follows:
if the content of the dissolved oxygen in the anaerobic tank is more than or equal to 0.2mg/L, the power of the aeration pipe is reduced, otherwise, the power is kept unchanged;
if the content of the dissolved oxygen in the anoxic tank is more than or equal to 0.5mg/L, the power of the aeration pipe is reduced, otherwise, the power is kept unchanged;
if the dissolved oxygen content in the aerobic tank is between 2 and 3mg/L, the oxygen content is kept unchanged, if the oxygen content is smaller than 2mg/L, the power of the aeration pipe is increased, and if the oxygen content is larger than 3mg/L, the power of the aeration pipe is reduced;
the central controller controls the power of the water pump to realize the residence time of sewage among the processes according to the data analysis result; the specific adjusting range is as follows:
the sewage retention time of the anaerobic tank is between 0.5 and 2.5 hours;
the sewage retention time of the anoxic tank is between 0.5 and 2.5 hours;
the sewage retention time of the aerobic tank is between 2 and 10 hours.
2. The method for regulating nitrogen and phosphorus removal of sewage according to claim 1, wherein the water inflow of the sewage is calculated by a first consumption sensor, and the water outflow of the sewage is calculated by a second consumption sensor; the temperature in the anaerobic tank, the anoxic tank and the aerobic tank is monitored by the temperature sensor.
3. The wastewater denitrification and dephosphorization regulation method of claim 1, wherein the first consumption sensor and the second consumption sensor are turbine consumption sensors; the pH sensor is an extended gate transistor pH sensor.
4. The method for regulating nitrogen and phosphorus removal of sewage according to claim 1, further comprising a stirrer and an aeration pipe connected with the central controller; the stirrer is respectively arranged at the bottoms of the anaerobic tank, the anoxic tank and the aerobic tank; the aeration pipes are respectively arranged at the bottoms of the anaerobic tank, the anoxic tank and the aerobic tank.
5. The wastewater denitrification and dephosphorization regulation method of claim 1, wherein the signal processor comprises an a/D conversion module.
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