CN113415886B - Anaerobic ammonia oxidation reactor water inlet temperature control system and PID control method thereof - Google Patents
Anaerobic ammonia oxidation reactor water inlet temperature control system and PID control method thereof Download PDFInfo
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- CN113415886B CN113415886B CN202110873599.XA CN202110873599A CN113415886B CN 113415886 B CN113415886 B CN 113415886B CN 202110873599 A CN202110873599 A CN 202110873599A CN 113415886 B CN113415886 B CN 113415886B
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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
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of 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
- C02F2209/005—Processes using a programmable logic controller [PLC]
- C02F2209/006—Processes using a programmable logic controller [PLC] comprising a software program or a logic diagram
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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
Abstract
An anaerobic ammonia oxidation reactor water inlet temperature control system and a PID control method thereof comprise: the reactor comprises a reactor body, a water inlet temperature control assembly, a primary water pump is arranged between the reactor body and the water inlet temperature control assembly, a temperature sensor is arranged outside the reactor body, a plurality of shunting tank bodies are further arranged, the shunting tank bodies are provided with the temperature sensor and a liquid level sensor, a water supply selection module sorts the shunting tank bodies according to a temperature difference efficiency model, and sewage of the control shunting tank bodies sequentially enters a temperature adjusting assembly and the reactor body according to a sorting sequence. By the temperature control system and the PID control method, the technical problems that the inlet water temperature of the anaerobic ammonia oxygen reactor in the prior art is large in fluctuation and is not suitable for being controlled are solved.
Description
Technical Field
The invention relates to an anaerobic ammonia oxidation reactor, in particular to a water inlet temperature control device of an anaerobic ammonia oxygen reactor and a control method thereof.
Background
Temperature is a factor that has a relatively large influence on the biological reaction, because both the microorganism participating in the reaction and the related enzyme playing a role in the biological reaction have temperature requirements, and too high or too low a temperature can produce an inhibitory effect on the biological reaction, and some inhibitory effects are even unrecoverable. Therefore, in order to ensure stable and normal operation of the Anammox (anaerobic ammonia oxygen) reaction, it is necessary to control the temperature of the reaction system within its optimum temperature range.
At normal temperature, nitrite can be rapidly oxidized into nitrate, when the temperature is higher than 30 ℃, obvious nitrite accumulation can be realized, anaerobic ammonia oxygen reaction requires that the nitrite is accumulated to a certain concentration, and even if part of the reaction can be carried out at normal temperature, the stable water inlet temperature position also needs to be ensured. In addition, the temperature of the waste water is difficult to reach the optimum temperature of Anammox in a natural state, and it is necessary to heat the waste water appropriately to reach the desired reaction temperature. But if it is heated, it increases the energy consumption and thus the water treatment cost.
Therefore, a set of reactor heating water inlet device which can not only ensure the optimum temperature for the Anammox (anaerobic ammonia oxygen) reaction, but also effectively save energy consumption and improve the use efficiency needs to be designed.
Disclosure of Invention
The invention aims to provide a water inlet temperature control system of an anaerobic ammonia oxidation reactor and a PID control method thereof, and aims to solve the technical problems that the water inlet temperature of the anaerobic ammonia oxidation reactor in the prior art is large in fluctuation and is not suitable for being controlled.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anammox reactor inlet water temperature control system comprising: the water inlet temperature control device comprises a reaction tank body and a water inlet temperature control assembly, wherein a water outlet of the water inlet temperature control assembly is connected with a water inlet of the reaction tank body, a primary water pump is arranged between the reaction tank body and the water inlet temperature control assembly, and an environment temperature sensor for sensing external environment temperature is arranged on the outer side of the reaction tank body; the temperature control component of intaking includes control assembly, temperature regulation subassembly and temperature detect subassembly, and the temperature detect subassembly is including setting up in the temperature sensor of intaking of water inlet department and the play water temperature sensor of water outlet department, and the temperature regulation subassembly includes spiral runner, intensification module, cooling module, and control assembly includes that the reposition of redundant personnel jar intakes and selects module, PID temperature control module.
The temperature rising module and the temperature lowering module can carry out temperature rising and temperature lowering control on the sewage flowing through the spiral flow passage.
The temperature rise and temperature drop control respectively comprises the steps of introducing constant high-temperature or low-temperature liquid into the spiral flow channel, and the PID temperature control module outputs an execution instruction to control the flow of the high-temperature or low-temperature liquid.
The water inlet temperature control method specifically comprises the following steps:
the method comprises the following steps: measuring the temperature of the sewage collected from different channels in advance, and discharging the sewage with different temperatures to different diversion tank bodies according to the temperature gradient;
step two: by dividing the tank bodyThe temperature sensor records the corresponding sewage temperature TiAnd the corresponding sewage quantity V is recorded by a liquid level sensor on the shunt tank bodyi(ii) a Recording ambient temperature T by ambient temperature sensor on reaction tank0；
Step three: the temperature T of the sewage in the step twoiVolume of sewage ViAnd the ambient temperature T0Data are transmitted to a water inlet selection module;
step four: setting the optimum reaction temperature T of the anaerobic ammonia oxidation reactor by a water inlet selection module1The water supply selection module sorts the plurality of the shunt tank bodies according to the temperature difference efficiency model, and controls the sewage of the shunt tank bodies to sequentially enter the temperature adjusting assembly and the reaction tank bodies according to the sorting sequence;
step five: the PID temperature control module receives a water inlet instruction of the water inlet selection module and a set optimal reaction temperature T1The PID output control signal controls the temperature rising module or the temperature lowering module to regulate the temperature of the sewage entering the spiral flow passage, so that the sewage has the optimal reaction temperature T when flowing into the reaction tank body1。
The calculation mode of the temperature difference efficiency model in the fourth step is as follows: a. thei=(T1-Ti)/ ViThe water inlet selection module selects the A of each shunt tank bodyiAnd sorting the values in an ascending order, and sequentially treating the sewage of the shunt tank bodies according to the ascending sorting order.
And the PID parameter setting in the step five is to complete the updating and setting of the PID parameter of the system and perform zero clearing operation on the proportional, integral and differential terms of the system at the same time after the sewage treatment of the shunt tank body of one tank is completed and before the sewage of the next tank is reinjected.
In the fifth step, AiWhen the temperature is more than 0, PID outputs a control signal to control the constant high-temperature liquid flow of the heating module, wherein A isiWhen the temperature is less than 0, the PID outputs a control signal to control the constant low-temperature liquid flow of the cooling module.
The PID parameter setting in the step five is carried out along with AiThe increase in value in turn increases the PID differentialThe term coefficient.
And in the fifth step, after updating and setting the PID parameters of the system are completed, before the water inlet temperature sensor at the water inlet and the water outlet temperature sensor at the water outlet detect temperature changes, setting the PID integral term to be equal to 0.
Comparing the environmental temperature T at specific time intervals in the process of regulating the temperature of the sewage in the fifth step0Optimum reaction temperature T1When | T0- T1When the temperature is more than 10 ℃, the optimal reaction temperature T is adjusted within a reasonable adjustment range1Close to the ambient temperature and set the PID integral term equal to 0 for a certain time after adjustment.
The invention has the beneficial effects that:
1. through the arrangement of the plurality of the shunt tank bodies, the temperature of the sewage to be treated is distinguished in advance, so that the sewage entering the temperature regulating assembly has a stable temperature in a long time, the input temperature fluctuation of a PID temperature control system is reduced, and the temperature regulating assembly can improve the temperature of the sewage in a short time to reach the optimal reaction temperature;
2. the temperature adjusting component is provided with a spiral flow passage for sewage to pass through, and meanwhile, a mode of injecting constant high-temperature or low-temperature liquid to improve the temperature of the sewage is adopted, so that cold water, hot water and the sewage can be fully mixed by the spiral flow passage, and the optimal reaction temperature of the temperature control target can be quickly reached;
3. a water inlet selection module is arranged, and simultaneously based on the sewage temperature and the sewage amount in each shunt tank, A is usedi=(T1-Ti)/ ViThe calculation models are sorted in an ascending order, and sewage with the minimum temperature difference and the maximum volume can be preferentially treated by the calculation sorting mode, so that the PID temperature control device can preferentially treat the small temperature difference regulation requirement, and the working efficiency of the temperature regulation assembly is improved;
4. the cold and hot water flow of the temperature control module is controlled by adopting a PID control mode, after the sewage treatment of one tank of the shunt tank body is finished, the PID proportion, the differential and the integral parameters of the system are updated and set before the next tank of sewage is injected again, and meanwhile, the PID proportion, the differential and the integral parameters are updated and setThe proportional, integral and differential terms of the system are reset, so that each sewage and the temperature deviation thereof can be independently controlled and adjusted, the application range and the adjustment capacity of a PID system are improved, and the proportional, integral and differential terms of the system are simultaneously reset along with AiThe increase of the value sequentially increases the PID differential coefficient, so that the overshoot prevention capability of the PID system after the temperature difference is changed greatly can be effectively improved, and the problem that the overshoot cannot be reduced through a temperature control module when the temperature rising and cooling module is used independently is avoided;
5. in AiWhen the temperature is more than 0, PID outputs a control signal to control the constant high-temperature liquid flow of the heating module, wherein A isiWhen the flow rate is less than 0, the PID outputs a control signal to control the constant low-temperature liquid flow rate of the cooling module, so that the operation of the heating module and the cooling module can be controlled through a set of PID system and orderly sewage input;
6. after the PID parameters of the system are updated and set, before the water inlet temperature sensor at the water inlet and the water outlet temperature sensor at the water outlet detect the temperature change, the PID integral term is set to be equal to 0, the PID parameters of the system are updated and set after the shunt tank bodies are replaced, the PID system starts to control the temperature adjusting module, the length of a conveying pipeline is increased before sewage enters the temperature adjusting module from the shunt tank bodies due to the arrangement of the plurality of shunt tank bodies, the sewage in a new shunt tank body lasts for a long time before reaching the temperature adjusting module, if the PID integral term is not cleared, the accumulation of control signals through the integral term is caused to generate a maximum value, and the system has the risk of instability;
7. comparing the ambient temperature T at specific time intervals0Optimum reaction temperature T1When | T0- T1When the temperature is more than 10 ℃, the optimal reaction temperature T is adjusted within a reasonable adjustment range1The PID integral term is set to be 0 within a certain time after adjustment, so that when the environmental temperature is greatly changed, such as the environmental temperature mutation caused by the reason of day and night temperature difference in a specific season, sudden change of weather and the like, the optimal reaction temperature is required to be as close to the environmental temperature as possible at the moment, the temperature loss of the reaction tank is reduced, and the likeThe new optimum reaction temperature is reset, when the optimum reaction temperature changes, the stability of the PID control system is also influenced, errors are suddenly increased, control signals are suddenly increased due to the increase of the integral term, and the system has instability risks, so that the PID integral term is reset under the condition, the reset of the optimum reaction temperature can be ensured, and the stability of the system is also ensured.
Drawings
FIG. 1 is a schematic diagram of the configuration of an influent water temperature control system of the present invention;
FIG. 2 is a schematic structural view of the water inlet temperature control assembly of the present invention;
FIG. 3 is a flow chart of the temperature control of the inlet water according to the present invention.
Detailed Description
The following detailed description of the preferred embodiments will be made with reference to the accompanying drawings.
An anammox reactor inlet water temperature control system comprising: the water inlet temperature control device comprises a reaction tank body 1 and a water inlet temperature control assembly 2, wherein a water outlet of the water inlet temperature control assembly 2 is connected with a water inlet of the reaction tank body 1, a primary water pump is arranged between the reaction tank body 1 and the water inlet temperature control assembly 2, an environment temperature sensor for sensing external environment temperature is arranged on the outer side of the reaction tank body 1, a plurality of shunting tank bodies 3 are also arranged, temperature sensors and liquid level sensors are arranged on the shunting tank bodies 3, different shunting tank bodies 3 are used for storing water from different sources and at different temperatures in advance, and a water outlet of each shunting tank body 3 is connected with a water inlet of the water inlet temperature control assembly 2; the water inlet temperature control assembly 2 comprises a control assembly, a temperature adjusting assembly and a temperature detecting assembly, the temperature detecting assembly comprises a water inlet temperature sensor arranged at a water inlet and a water outlet temperature sensor arranged at a water outlet, the temperature adjusting assembly comprises a spiral flow channel, a heating module and a cooling module, and the control assembly comprises a shunt tank water inlet selection module and a PID temperature control module. Through setting up a plurality of reposition of redundant personnel jar bodies, carry out the temperature differentiation in advance to the sewage that needs to be handled for the sewage that gets into temperature regulation subassembly has roughly stable temperature in the longer time, and it is undulant to have reduced PID temperature control system's input temperature, makes temperature regulation subassembly can improve in order to reach optimum reaction temperature to sewage temperature with the very fast time.
The temperature rising module and the temperature lowering module can carry out temperature rising and temperature lowering control on the sewage flowing through the spiral flow passage. The temperature rise and the temperature drop are respectively controlled by introducing constant high-temperature or low-temperature liquid into the spiral flow channel, and the PID temperature control module outputs an execution instruction to control the flow of the high-temperature or low-temperature liquid. The temperature control structure of the sewage in the spiral flow passage by the temperature rising module and the temperature lowering module is explained below.
Fig. 2 is a schematic structural diagram of the water inlet temperature control assembly 2. The water inlet temperature control component 2 comprises a spiral runner 21 consisting of a cylinder and a spiral groove, and a long hollow central cylindrical channel is arranged at the center of the spiral runner 21. On one side of the spiral flow passage, a sewage water inlet passage 24, a hot water inlet passage 25, and a cold water inlet passage 26 are provided. The sewage inlet passage 24 is directly led into the spiral flow passage 21 from the end part of the spiral flow passage 21, the hot water inlet passage 25 is led into the spiral flow passage from the cylindrical outer periphery side of the spiral flow passage 21, and the cold water inlet passage 26 is led into the spiral flow passage 21 from the central cylindrical passage. On the other side of the spiral flow channel 21, a sewage outlet flow channel 27 is provided. After entering the spiral flow channel 21, sewage, hot water or cold water is fully mixed by the spiral groove and flows out through the water outlet, and a temperature sensor is arranged at the outlet of each water inlet and outlet flow channel and connected with a PID temperature control system.
A movable cylinder 22 which can axially move along the periphery of the spiral flow channel is arranged on the outer side of the spiral flow channel 21, and the movable cylinder 22 can open and close a hot water inlet passage 25 through axial movement so as to adjust the inlet flow of hot water; in the central cylindrical passage, a movable rod 23 capable of moving along the axial direction of the central cylindrical passage is arranged, and the movable rod 23 can open and close a cold water inlet passage 26 through axial movement so as to adjust the inlet water flow of cold water. The moving cylinder 22 and the moving rod 23 are respectively connected with the temperature rising module 29 and the temperature lowering module 28 in a control mode.
As shown in fig. 3, the inlet water temperature control specifically includes the following steps:
the method comprises the following steps: measuring the temperature of the sewage collected from different channels in advance, and discharging the sewage with different temperatures to different diversion tank bodies according to the temperature gradient;
step two: record corresponding sewage temperature T through temperature sensor on reposition of redundant personnel jar bodyiAnd the corresponding sewage quantity V is recorded by a liquid level sensor on the shunt tank bodyi(ii) a Recording ambient temperature T by ambient temperature sensor on reaction tank0；
Step three: the temperature T of the sewage in the step twoiVolume of sewage ViAnd the ambient temperature T0Data are transmitted to a water inlet selection module;
step four: setting the optimum reaction temperature T of the anaerobic ammonia oxidation reactor by a water inlet selection module1The water supply selection module sorts the plurality of the shunt tank bodies according to the temperature difference efficiency model, and controls the sewage of the shunt tank bodies to sequentially enter the temperature adjusting assembly and the reaction tank bodies according to the sorting sequence;
step five: the PID temperature control module receives a water inlet instruction of the water inlet selection module and a set optimal reaction temperature T1The PID output control signal controls the temperature rising module or the temperature lowering module to regulate the temperature of the sewage entering the spiral flow passage, so that the sewage has the optimal reaction temperature T when flowing into the reaction tank body1。
The calculation method of the temperature difference efficiency model in the fourth step is as follows: a. thei=(T1-Ti)/ ViThe water inlet selection module selects the A of each shunt tank bodyiAnd sequencing the values in an ascending order, and sequentially treating the sewage of the distribution tank bodies according to the ascending order. Through this calculation sequencing mode for sewage with the minimum, the largest volume of optimum temperature difference is handled preferentially, makes PID temperature control device can the priority handle little difference in temperature regulation demand, has improved the work efficiency of temperature regulation subassembly.
And step five, PID parameter setting, namely after the sewage treatment of one tank of the shunt tank body is finished and before the next tank of sewage is injected again, updating and setting the PID parameter of the system, and simultaneously carrying out zero clearing operation on the proportional, integral and differential terms of the system. This operation makes it possible to perform individual control regulation of each kind of sewage and its temperature deviation, improving the PIDThe range of use and the adjustment capability of the system, and simultaneously with AiThe increase of value increases PID differential item coefficient in proper order, can effectual improvement PID system change great back system prevent the overshoot ability in the difference in temperature, can not reduce the problem of overshoot through temperature regulation module when having avoided exclusive use heating and cooling module.
In step five, in AiWhen the temperature is more than 0, PID outputs a control signal to control the constant high-temperature liquid flow of the heating module, wherein A isiWhen the temperature is less than 0, the PID outputs a control signal to control the constant low-temperature liquid flow of the cooling module, and the operation can control the operation of the heating module and the cooling module through a set of PID system and orderly sewage input.
In the fifth step, the PID parameter is adjusted along with AiThe increase in value in turn increases the PID derivative coefficient.
And step five, after the PID parameters of the system are updated and set, before the water inlet temperature sensor at the water inlet and the water outlet temperature sensor at the water outlet detect the temperature change, the PID integral term is set to be equal to 0, the PID parameters of the system are updated and set after the shunt tank bodies are replaced, the PID system starts to control the temperature adjusting module, the length of a conveying pipeline is increased before sewage enters the temperature adjusting module from the shunt tank bodies due to the arrangement of the plurality of shunt tank bodies, the sewage in the new shunt tank body passes through the temperature adjusting module for a long time, and if the PID integral term is not cleared, the control signals are accumulated through the integral term to generate a maximum value, so that the system has the risk of instability.
Comparing the environmental temperature T at specific time intervals in the process of regulating the temperature of the sewage in the step five0Optimum reaction temperature T1When | T0- T1When the temperature is more than 10 ℃, the optimal reaction temperature T is adjusted within a reasonable adjustment range1Close to the ambient temperature and set the PID integral term equal to 0 for a certain time after adjustment. The operation can make the environment temperature change suddenly when the environment temperature changes greatly, such as day and night temperature difference in specific seasons, sudden change of weather, etc., in order to make the optimum reaction temperatureThe temperature is as close to the ambient temperature as possible, the temperature loss of the reaction tank is reduced, a new optimum reaction temperature needs to be reset, when the optimum reaction temperature changes, the stability of a PID control system can be affected, errors can be increased suddenly, control signals can be increased suddenly due to the increase of an integral term, the system has instability risks, therefore, the PID integral term is cleared to zero under the condition, the reset of the optimum reaction temperature can be guaranteed, and the stability of the system is also guaranteed.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A PID control method of an anaerobic ammonia oxidation reactor water inlet temperature control system is characterized by comprising the following steps: the water inlet temperature control method specifically comprises the following steps:
the method comprises the following steps: measuring the temperature of the sewage collected from different channels in advance, and discharging the sewage with different temperatures to different diversion tank bodies according to the temperature gradient;
step two: record corresponding sewage temperature T through temperature sensor on reposition of redundant personnel jar bodyiAnd the corresponding sewage quantity V is recorded by a liquid level sensor on the shunt tank bodyi(ii) a Recording ambient temperature T by ambient temperature sensor on reaction tank0；
Step three: the temperature T of the sewage in the step twoiVolume of sewage ViAnd the ambient temperature T0Data transmission to a water inlet selection module;
step four: setting the optimum reaction temperature T of the anaerobic ammonia oxidation reactor by a water inlet selection module1The water supply selection module sorts the plurality of the shunt tank bodies according to the temperature difference efficiency model, and controls the sewage of the shunt tank bodies to sequentially enter the temperature adjusting assembly and the reaction tank bodies according to the sorting sequence;
step five: the PID temperature control module receives a water inlet instruction of the water inlet selection module and a set optimal reaction temperature T1The PID output control signal controls the temperature rising module or the temperature lowering module to regulate the temperature of the sewage entering the spiral flow passage, so that the sewage has the optimal reaction temperature T when flowing into the reaction tank body1；
The anaerobic ammonia oxidation reactor inlet water temperature control system comprises: the water inlet temperature control assembly is characterized by also comprising a plurality of shunting tanks, wherein the shunting tanks are provided with temperature sensors and liquid level sensors, different shunting tanks are used for storing water from different sources at different temperatures in advance, and the water outlets of the shunting tanks are connected with the water inlets of the water inlet temperature control assembly; the temperature control component of intaking includes control assembly, temperature regulation subassembly and temperature detect subassembly, and the temperature detect subassembly is including setting up in the temperature sensor of intaking of water inlet department and the play water temperature sensor of water outlet department, and the temperature regulation subassembly includes spiral runner, intensification module, cooling module, and control assembly includes that the reposition of redundant personnel jar intakes and selects module, PID temperature control module.
2. The PID control method of the anammox reactor inlet water temperature control system according to claim 1, wherein: the calculation mode of the temperature difference efficiency model in the fourth step is as follows: a. thei=(T1-Ti)/ ViThe water inlet selection module selects the A of each shunt tank bodyiAnd sequencing the values in an ascending order, and sequentially treating the sewage of the distribution tank bodies according to the ascending order.
3. The PID control method of the anammox reactor inlet water temperature control system according to claim 1, wherein: and the PID parameter setting in the fifth step is to complete the updating and setting of the system PID parameter after the sewage treatment of one shunt tank body is completed and before the next tank of sewage is reinjected, and simultaneously to perform zero clearing operation on the system proportional, integral and differential terms.
4. The PID control method of the anammox reactor inlet water temperature control system according to claim 1, wherein: in the fifth step, in AiWhen the temperature is more than 0, PID outputs a control signal to control the constant high-temperature liquid flow of the heating module, wherein A isiWhen the temperature is less than 0, the PID outputs a control signal to control the constant low-temperature liquid flow of the cooling module.
5. The PID control method of the anammox reactor inlet water temperature control system according to claim 3, wherein: the PID parameter setting in the step five is carried out along with AiThe increase in value in turn increases the PID derivative coefficient.
6. The PID control method of the anammox reactor inlet water temperature control system according to claim 3, wherein: and in the fifth step, after updating and setting the PID parameters of the system are completed, before the water inlet temperature sensor at the water inlet and the water outlet temperature sensor at the water outlet detect temperature changes, setting the PID integral term to be equal to 0.
7. The PID control method of the anammox reactor inlet water temperature control system according to claim 1, wherein: comparing the environmental temperature T at specific time intervals in the process of regulating the temperature of the sewage in the fifth step0Optimum reaction temperature T1When | T0- T1When the temperature is more than 10 ℃, the optimal reaction temperature T is adjusted within a reasonable adjustment range1Close to the ambient temperature and set the PID integral term equal to 0 for a certain time after adjustment.
8. The PID control method of the anammox reactor inlet water temperature control system according to claim 1, wherein: the heating module and the cooling module can be used for heating and cooling the sewage flowing through the spiral flow passage.
9. The PID control method of an anammox reactor feed water temperature control system as claimed in claim 8, wherein: the temperature rise and temperature drop control respectively comprises the steps of introducing constant high-temperature or low-temperature liquid into the spiral flow channel, and the PID temperature control module outputs an execution instruction to control the flow of the high-temperature or low-temperature liquid.
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