CN111995083B - Intelligent real-time aeration control method for anaerobic ammonia oxidation reaction process - Google Patents
Intelligent real-time aeration control method for anaerobic ammonia oxidation reaction process Download PDFInfo
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Abstract
The invention discloses an intelligent real-time aeration control method for an anaerobic ammonia oxidation reaction process, which comprises the following steps: monitoring the real-time ammonia nitrogen concentration, the real-time nitrite nitrogen concentration and the real-time nitrate nitrogen concentration of the sewage, and calculating the real-time denitrification rate; calculating the real-time theoretical oxygen consumption Rate R1(ii) a Monitoring the real-time dissolved oxygen concentration and the real-time aeration rate in the sewage, and calculating the real-time actual oxygen input rate R2(ii) a R is corrected by adopting a correction parameter k2To give R'2(ii) a Adjusting the real-time aeration rate to make R'2Always with R1And (4) equaling until the whole reaction process is finished. The invention calculates and compares R1And R'2The real-time automatic regulation and control of the actual aeration rate are carried out, so that the condition of denitrification capacity fluctuation caused by the factors such as temperature, load, inhibitor concentration and the like in the actual reaction process is adapted, the activity and denitrification efficiency of the anaerobic ammonia oxidation bacteria in the reaction process are always in the optimal state, and the denitrification efficiency is improved.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an intelligent real-time aeration control method for an anaerobic ammonia oxidation reaction process.
Background
The integrated anaerobic ammonia oxidation process is an autotrophic novel biological denitrification technology; compared with the traditional nitrification-heterotrophic denitrification process, the process has the characteristics of saving aeration cost, no additional carbon source, low sludge yield and the like.
The integrated anammox process involves three key microbial dominated nitrogen conversion processes: 1) converting about half of ammonia nitrogen into nitrite nitrogen by aerobic ammonia oxidizing bacteria in the presence of oxygen; 2) meanwhile, converting nitrite nitrogen and the remaining half of ammonia nitrogen into nitrogen by anaerobic ammonia oxidizing bacteria to remove, and finishing the denitrification process; 3) because of having similar niches to the anammox bacteria, nitrite-oxidizing bacteria always coexist with the anammox bacteria, but they further oxidize nitrite nitrogen into nitrate nitrogen, resulting in a decrease in denitrification efficiency. Meanwhile, nitrite oxidizing bacteria also compete for oxygen with aerobic ammonia oxidizing bacteria, and compete for nitrite nitrogen with anaerobic ammonia oxidizing bacteria, so that the nitrite oxidizing bacteria and the anaerobic ammonia oxidizing bacteria need to be inhibited.
Accurate control of oxygen input is required during actual operation to maintain the balance of these three key classes of microorganisms: effectively maintains aerobic ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria, avoids inhibition of anaerobic ammonia oxidation caused by excessive oxygen input, and inhibits aerobic nitrite oxidizing bacteria. However, in the actual operation process, the integrated anaerobic ammonia oxidation process faces the fluctuation of the denitrification capacity of anaerobic ammonia oxidation bacteria and the fluctuation of the oxygen demand caused by the change of the operation conditions such as temperature, ammonia nitrogen load, ammonia nitrogen concentration, inhibitor concentration and the like. If the aeration rate cannot be adjusted in time, the problems of excessive or insufficient aeration, inhibition of anammox bacteria, excessive propagation of nitrite oxidizing bacteria and the like are likely to be generated, and further the denitrification efficiency of the reactor is reduced. The real-time control of the aeration rate according to the operation condition of the reactor is always an operation and maintenance difficulty of the integrated anaerobic ammonia oxidation process and is also one of the main challenges which hinder the industrial popularization and application of the process.
The existing integrated anaerobic ammonia oxidation reactor is used for indicating the anaerobic ammonia oxidation reaction process and controlling the aeration rate by monitoring pH, ammonia nitrogen concentration, nitrite or nitrate concentration, nitrate/ammonia nitrogen ratio, dissolved oxygen concentration and the like. The aeration control method based on ammonia nitrogen or nitrate compares the monitored ammonia nitrogen concentration or nitrate \ ammonia nitrogen ratio with a theoretical value or a set value to control the start or the end of aeration. The dissolved oxygen-based aeration control method inhibits the activity of nitrite oxidizing bacteria by setting a dissolved oxygen concentration limit value to maintain the dissolved oxygen concentration within a certain range. The aeration control method based on pH utilizes the principle that hydrogen ions are generated by the integrated anaerobic ammonia oxidation reaction, and controls the start of aeration or the rise and fall of the aeration rate by setting the pH value.
The premise of maintaining high-efficiency denitrification efficiency is that the operating conditions such as aeration rate and the like are effectively controlled in time according to the denitrification capacity of the microorganisms, so that the denitrification requirement of the microorganisms can be met, the excess is avoided, and the activity of anaerobic ammonium oxidation bacteria and the inhibition of nitrite oxidizing bacteria are maintained. Improper monitoring and control not only can not effectively utilize the process potential, but also can cause the inhibition and loss of anammox bacteria, the over-proliferation of nitrite oxidizing bacteria, the reduction of denitrification efficiency and even the collapse of a reactor. The core microorganisms in the integrated anaerobic ammonia oxidation process are anaerobic ammonia oxidation bacteria which grow slowly and are easy to be inhibited by dissolved oxygen and the like, and once the reactor is disturbed, the reactor needs a long time to recover.
The existing aeration control method indicates the integrated anaerobic ammonia oxidation reaction process by monitoring reaction substrates or reaction products, and then regulates and controls the aeration process. For example, a control method based on dissolved oxygen is to estimate the consumption of oxygen by monitoring the dissolved oxygen concentration and to indirectly indicate the progress of the reaction. The methods only monitor the level of certain substances in the reactor, cannot effectively indicate the speed of reaction and the denitrification capacity of microorganisms in the reactor, and cannot timely and effectively regulate and control the operating conditions such as aeration rate according to the change of the denitrification capacity. The methods are suitable for ideal conditions with relatively stable conditions such as temperature, load, ammonia nitrogen concentration, inhibitor concentration and the like. However, in actual operation, these conditions are constantly in fluctuation, resulting in a change in the denitrification capacity of the reactor. This means that these methods cannot adjust the operating conditions such as aeration in time to accommodate the change in denitrification capacity.
Disclosure of Invention
The invention provides an intelligent real-time aeration control method for an anaerobic ammonia oxidation reaction process, which can automatically regulate and control the actual aeration rate in real time, so that the method is suitable for the condition of fluctuation of denitrification capacity caused by the change of factors such as temperature, load, inhibitor concentration and the like in the actual reaction process, the activity and denitrification efficiency of anaerobic ammonia oxidation bacteria are always in the optimal state in the reaction process, and the denitrification efficiency is improved.
The specific technical scheme is as follows:
an intelligent real-time aeration control method for an anaerobic ammonia oxidation reaction process comprises the following steps:
(1) monitoring the real-time ammonia nitrogen concentration, the real-time nitrite nitrogen concentration and the real-time nitrate nitrogen concentration of the sewage in the anaerobic ammonia oxidation reaction process, and calculating the real-time denitrification rate;
(2) calculating a real-time theoretical oxygen consumption rate R according to the real-time denitrification rate obtained in the step (1)1；
(3) Monitoring the real-time dissolved oxygen concentration and the real-time aeration rate in the wastewater, and calculating the real-time oxygen input rate R according to the formula (1)2(ii) a The formula (1) is as follows:
R2＝(αv+b)×(Cs-Ct’–t)×V (1)；
in the formula (1), R2Representing a real-time oxygen input rate; v represents the real-time aeration rate; a and b are the slope and intercept of the linear relation between the aeration rate and the total oxygen transfer coefficient measured before the aeration device is used; csRepresents the saturated dissolved oxygen concentration at real time temperature; ct’–tDenotes the average dissolved oxygen concentration value, C, over a period of time from t to tt’–t＝(Ct’+Ct)/2，Ct’Represents the dissolved oxygen concentration at the time point of t', CtRepresents the dissolved oxygen concentration at time t; v represents the reactor volume; t 'and t respectively represent two different running times in the anaerobic ammonia oxidation reaction process, and t' is more than t;
(4) using correction parameter k to real-time oxygen input rate R2Correcting to obtain a corrected real-time actual oxygen input rate R'2The correction formula is one of the following formulas:
(4-1) if NIt’>NItThen k is 2.23 Δ N/[2.23 Δ N +3.4 (NI)t’-NIt)+4.57(|NAt-NAt’|-0.15ΔN)]，ΔN＝(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)；
(4-2) if NIt’≤NItThen k equals 2.23 Δ N/[2.23 Δ N +4.57(| NA)t-NAt’|-0.15ΔN)]；ΔN＝(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)；
Wherein NIt’A concentration value representing the nitrite nitrogen concentration at time point t'; NItA concentration value representing the nitrite nitrogen concentration at time point t; k represents a correction parameter; NAtRepresents the concentration value of nitrate nitrogen at the time point t; NAt’Represents the concentration value of nitrate nitrogen at the time point of t'; NH (NH)tRepresenting the concentration value of ammonia nitrogen at the time point t; NH (NH)t’Representing the concentration value of ammonia nitrogen at the time point of t';
(5) adjusting the real-time aeration rate in real time according to the formulas provided in the step (3) and the step (4) to enable R'2Always with R1And (4) equaling until the whole reaction process is finished.
The method calculates the denitrification rate in unit time by monitoring the change conditions of the ammonia nitrogen, nitrite nitrogen and nitrate nitrogen concentrations in the anaerobic ammonia oxidation reaction process, and the denitrification rate indicates the actual denitrification capability of the process in real time. The unit time can be set according to the actual condition of the anaerobic ammonia oxidation reaction process. Then, the theoretical oxygen consumption rate was calculated based on the denitrification rate. The real-time aeration rate and the real-time actual oxygen input rate R can be established according to the slope a and the intercept b of the linear relation between the aeration rate and the total oxygen transfer coefficient measured before the aeration device is used2The relationship between them. Finally, the actual aeration rate is regulated by comparing the magnitude relationship between the theoretical oxygen consumption rate and the actual oxygen input rate.
The slope a and the intercept b can be directly provided by manufacturers for producing aeration devices, or can be used for automatically measuring the aeration rate and the total oxygen transfer coefficient and establishing a linear relation between the aeration rate and the total oxygen transfer coefficient, so as to obtain specific values of the slope a and the intercept b. The real-time oxygen input rate R calculated in the step (3) is obtained because the quality and the actual temperature of the sewage to be treated are in a constantly changing state in the treatment process2Deviation still exists between the actual oxygen input rate and the actual oxygen input rate, and correction is needed; therefore, the invention introduces a correction factor k to correct the deviation according to real-time operating conditions.
The invention firstly evaluates the denitrification capability of the process in real time, and then automatically regulates and controls the aeration quantity in real time to approximately meet the requirement of microorganism denitrification on oxygen, thereby ensuring that the reactor can timely and properly regulate and control the aeration according to the change of the denitrification capability and ensuring that the activity of anaerobic ammonium oxidation bacteria and the denitrification efficiency in the reactor are always in the best state.
Further, in the step (1), a calculation formula of the real-time denitrification rate is shown as a formula (2);
VN＝[(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)]/Δt (2)；
in the formula (2), VNRepresenting the real-time denitrification rate; NH (NH)tRepresenting the ammonia nitrogen concentration value at the t time point; NIt(ii) nitrite nitrogen concentration value representing the t time point; NAt(ii) a nitrate nitrogen concentration value representing the t time point; NH (NH)t’Representing the ammonia nitrogen concentration value of the t' time point; NIt’(ii) nitrite nitrogen concentration value representing the t' time point; NAt’The nitrate nitrogen concentration value representing the t' time point; Δ t ═ t' -t.
Further, in the step (2), the theoretical oxygen consumption rate R1The formula (3) is shown in the formula;
R1＝2.23VN (3)；
in the formula (3), R1Representing the real-time theoretical oxygen consumption rate, VNIndicating the real-time denitrification rate.
The invention also provides an intelligent real-time aeration control method for the anaerobic ammonia oxidation reaction process, which adopts an intelligent real-time aeration control system to control aeration;
the intelligent real-time aeration control system comprises an anaerobic ammonia oxidation reactor, an online water quality monitoring probe group, an aeration device and a data acquisition, analysis and control device; the aeration device comprises a fan, an air flow meter, a flow automatic control valve and an aeration head which are sequentially and electrically connected;
the aeration head is arranged at the bottom of the anaerobic ammonia oxidation reactor, and an online water quality monitoring probe group, namely an ammonia nitrogen monitoring probe, a nitrite nitrogen monitoring probe, a nitrate nitrogen monitoring probe and a dissolved oxygen monitoring probe, is arranged at the upper part of the anaerobic ammonia oxidation reactor; the data acquisition, analysis and control device is respectively and electrically connected with the online water quality monitoring probe group, the flow automatic control valve and the aeration head;
the method comprises the following specific steps:
(1) in an anaerobic ammonia oxidation reactor, monitoring real-time ammonia nitrogen concentration, real-time nitrite nitrogen concentration and real-time nitrate nitrogen concentration temperature of sewage by using an ammonia nitrogen monitoring probe, a nitrite nitrogen monitoring probe and a nitrate nitrogen monitoring probe, transmitting water quality data acquired by each probe to a data acquisition analysis and control device, and calculating real-time denitrification rate;
(2) calculating a real-time theoretical oxygen consumption rate R by using a data acquisition analysis and control device according to the real-time denitrification rate obtained in the step (1)1；
(3) Monitoring the real-time dissolved oxygen concentration of the sewage by using a dissolved oxygen monitoring probe, monitoring the real-time aeration rate by using an air flow meter, transmitting data to a data acquisition, analysis and control device, and calculating the real-time oxygen input rate R according to the formula (1)2(ii) a The formula (1) is as follows:
R2＝(αv+b)×(Cs-Ct’–t)×V (1)；
in the formula (1), R2Representing a real-time oxygen input rate; v represents the real-time aeration rate; a and b are the slope and intercept of the linear relation between the aeration rate and the total oxygen transfer coefficient measured before the aeration device is used; csRepresents the saturated dissolved oxygen concentration at real time temperature; ct’–tDenotes the average dissolved oxygen concentration value, C, over a period of time from t to tt’–t＝(Ct’+Ct)/2，Ct’Represents the dissolved oxygen concentration at time point t', CtRepresents the dissolved oxygen concentration at time t; v represents the reactor volume; t 'and t respectively represent two different running times in the anaerobic ammonia oxidation reaction process, and t' is more than t;
(4) the data acquisition, analysis and control device (4) adopts the correction parameter k to the real-time oxygen input rate R2Correcting to obtain a corrected real-time actual oxygen input rate R'2The correction formula is one of the following formulas:
(4-1) if NIt’>NItThen k is 2.23 Δ N/[2.23 Δ N +3.4 (NI)t’-NIt)+4.57(|NAt-NAt’|-0.15ΔN)]，ΔN＝(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)；
(4-2) if NIt’≤NItThen k equals 2.23 Δ N/[2.23 Δ N +4.57(| NA)t-NAt’|-0.15ΔN)]，ΔN＝(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)；
Wherein NIt’A concentration value representing the nitrite nitrogen concentration at time point t'; NItA concentration value representing the nitrite nitrogen concentration at time point t; k represents a correction parameter; NAtRepresents the concentration value of nitrate nitrogen at the time point t; NAt’Represents the concentration value of nitrate nitrogen at the time point of t'; NH (NH)tRepresenting the concentration value of ammonia nitrogen at the time point t; NH (NH)t’Representing the concentration value of ammonia nitrogen at the time point of t';
(5) according to the formulas provided in the step (3) and the step (4), the opening and the closing of the flow automatic control valve are controlled, the real-time aeration rate is adjusted in real time, and R'2Always with R1And (4) equaling until the whole reaction process is finished.
Further, in the step (1), a calculation formula of the real-time denitrification rate is shown as a formula (2);
VN＝[(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)]/Δt (2)；
in the formula (2), VNRepresenting the real-time denitrification rate; NH (NH)tRepresenting the ammonia nitrogen concentration value at the t time point; NIt(ii) nitrite nitrogen concentration value representing the t time point; NAt(ii) a nitrate nitrogen concentration value representing the t time point; NH (NH)t’Representing the ammonia nitrogen concentration value of the t' time point; NIt’Nitrite nitrogen concentration as indicated at time tA value; NAt’The nitrate nitrogen concentration value representing the t' time point; Δ t ═ t' -t.
Further, in the step (2), the theoretical oxygen consumption rate R1The formula (3) is shown in the formula;
R1＝2.23VN (3)；
in the formula (3), R1Representing the real-time theoretical oxygen consumption rate, VNIndicating the real-time denitrification rate.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method of the invention calculates and compares the real-time theoretical oxygen consumption rate R1And a corrected real-time actual oxygen input rate R'2The real-time automatic regulation and control of the actual aeration rate are carried out, so that the condition of denitrification capacity fluctuation caused by the factors such as temperature, load, inhibitor concentration and the like in the actual reaction process is adapted, the activity and denitrification efficiency of the anaerobic ammonia oxidation bacteria in the reaction process are always in the optimal state, and the denitrification efficiency is improved.
(2) The method also provides an intelligent real-time aeration control system matched with the intelligent real-time aeration control method, can effectively realize intelligent real-time aeration control, improves the denitrification efficiency, and has simple structure and easy installation.
(3) The method can effectively avoid the unbalance of key microbial flora caused by excessive or insufficient aeration in the actual operation process of the integrated anaerobic ammonia oxidation process, and ensure the long-term and efficient denitrification performance of the reactor.
Drawings
FIG. 1 is a schematic structural diagram of an intelligent real-time aeration control system according to the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples, which are only illustrative of the present invention, but the scope of the present invention is not limited thereto.
Example 1
As shown in fig. 1, the present invention provides an intelligent real-time aeration control system, which comprises an anammox reactor 1, an online water quality monitoring probe set, an aeration device and a data acquisition, analysis and control device 8.
Wherein, the aeration device comprises a fan 11, an air flow meter 10, a flow automatic control valve 9 and an aeration head 2 which are electrically connected in sequence; the aeration head 2 is arranged at the bottom of the anaerobic ammonia oxidation reactor 1, and an online water quality monitoring probe group, namely an ammonia nitrogen monitoring probe 3, a nitrite nitrogen monitoring probe 4, a nitrate nitrogen monitoring probe 5, a dissolved oxygen monitoring probe 6 and a temperature monitoring probe 7, is arranged at the upper part of the anaerobic ammonia oxidation reactor 1. The data acquisition, analysis and control device 8 is respectively and electrically connected with the ammonia nitrogen monitoring probe 3, the nitrite nitrogen monitoring probe 4, the nitrate nitrogen monitoring probe 5, the dissolved oxygen monitoring probe 6, the temperature monitoring probe 7, the air flow meter 10, the flow automatic control valve 9 and the aeration head 2.
The invention also provides an intelligent real-time aeration control method for the anaerobic ammonia oxidation reaction process, which comprises the following specific steps:
(1) in an anaerobic ammonia oxidation reactor, monitoring real-time ammonia nitrogen concentration, real-time nitrite nitrogen concentration and real-time nitrate nitrogen concentration real-time temperature of sewage by using an ammonia nitrogen monitoring probe, a nitrite nitrogen monitoring probe and a nitrate nitrogen monitoring probe, transmitting water quality data acquired by each probe to a data acquisition analysis and control device, and calculating real-time denitrification rate;
the calculation formula of the real-time denitrification rate is shown as the formula (2);
VN＝[(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)]/Δt (2)；
in the formula (2), VNRepresenting the real-time denitrification rate; NH (NH)tRepresenting the ammonia nitrogen concentration value at the t time point; NIt(ii) nitrite nitrogen concentration value representing the t time point; NAt(ii) a nitrate nitrogen concentration value representing the t time point; NH (NH)t’Representing the ammonia nitrogen concentration value of the t' time point; NIt’(ii) nitrite nitrogen concentration value representing the t' time point; NAt’The nitrate nitrogen concentration value representing the t' time point; Δ t ═ t' -t.
(2) The real-time dehydration obtained according to the step (1)Nitrogen rate, and calculating real-time theoretical oxygen consumption rate R by using data acquisition, analysis and control device1；
Theoretical oxygen consumption Rate R1The formula (3) is shown in the formula;
R1＝2.23VN (3)；
in the formula (3), R1Representing the real-time theoretical oxygen consumption rate, VNIndicating the real-time denitrification rate.
(3) Monitoring the real-time dissolved oxygen concentration of the sewage by using a dissolved oxygen monitoring probe, monitoring the real-time aeration rate by using an air flow meter, transmitting data to a data acquisition, analysis and control device, and calculating the real-time oxygen input rate R according to the formula (1)2(ii) a The formula (1) is as follows:
R2＝(αv+b)×(Cs-Ct’–t)×V (1)；
in the formula (1), R2Representing a real-time oxygen input rate; v represents the real-time aeration rate; a and b are the slope and intercept of the linear relation between the aeration rate and the total oxygen transfer coefficient measured before the aeration device is used; csRepresents the saturated dissolved oxygen concentration at real time temperature; ct’–tDenotes the average dissolved oxygen concentration value, C, over a period of time from t to tt’–t＝(Ct’+Ct)/2，Ct’Represents the dissolved oxygen concentration at time point t', CtRepresents the dissolved oxygen concentration at time t; v represents the reactor volume; t 'and t represent two different running times during the anammox reaction, respectively, and t' > t.
The slope a and the intercept b can be directly provided by manufacturers for producing aeration devices, or can be used for automatically measuring the aeration rate and the total oxygen transfer coefficient and establishing a linear relation between the aeration rate and the total oxygen transfer coefficient, so as to obtain specific values of the slope a and the intercept b. The parameters α and b are usually measured under specific conditions, such as at a specific temperature (20 ℃) using tap water, and are at a certain distance from the actual operating conditions of the sewage plant. This leads to a deviation of the calculated oxygen input rate from the actual oxygen input rate, for which a further correction step is introduced.
(4) The data acquisition, analysis and control device adopts the correction parameter k to the real-time actual oxygen input rate R2Correcting to obtain a corrected real-time actual oxygen input rate R'2The correction method is as follows:
(4-1) if NIt’>NItThen k is 2.23 Δ N/[2.23 Δ N +3.4 (NI)t’-NIt)+4.57(|NAt-NAt’|-0.15ΔN)]，ΔN＝(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)；
(4-2) if NIt’≤NItThen k equals 2.23 Δ N/[2.23 Δ N +4.57(| NA)t-NAt’|-0.15ΔN)]，ΔN＝(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)；
Wherein NIt’A concentration value representing the nitrite nitrogen concentration at time point t'; NItA concentration value representing the nitrite nitrogen concentration at time point t; k represents a correction parameter; NAtRepresents the concentration value of nitrate nitrogen at the time point t; NAt’Represents the concentration value of nitrate nitrogen at the time point of t'; NH (NH)tRepresenting the concentration value of ammonia nitrogen at the time point t; NH (NH)t’And (4) representing the concentration value of ammonia nitrogen at the time point of t'.
(5) Controlling the opening and closing of the flow automatic control valve according to the formulas provided in the step (3) and the step (4), and adjusting the real-time aeration rate in real time to enable R'2Always with R1And (4) equaling until the whole reaction process is finished.
Application example 1
The application example adopts the method provided by the embodiment 1 to simulate the aged landfill leachate sewage by using the artificially synthesized sewage to carry out intelligent real-time aeration control; the prepared sewage comprises 300-900mg/L ammonia nitrogen, 100mg/L Chemical Oxygen Demand (COD), 58mg/L magnesium sulfate heptahydrate, 111mg/L potassium dihydrogen phosphate and 170mg/L calcium chloride hexahydrate. The effective volume of the reactor is 8L. The temperature was controlled at 30 ℃. Aeration device parameters α were 21.3 and b was-0.0933. The control time period delta t is 2 min. After the reactor is operated for 129 days, the denitrification efficiency reaches 81 percent.
By taking the conventional aeration method of anaerobic ammoxidation process treatment as a contrast, adopting an aeration control method based on dissolved oxygen, setting the set value of the dissolved oxygen to be 0.33mg/L, the aeration rate to be 0.5-0.6L/min and the denitrification efficiency to be 65.6%.
Claims (6)
1. An intelligent real-time aeration control method for an anaerobic ammonia oxidation reaction process is characterized by comprising the following steps:
(1) monitoring the real-time ammonia nitrogen concentration, the real-time nitrite nitrogen concentration and the real-time nitrate nitrogen concentration of the sewage in the anaerobic ammonia oxidation reaction process, and calculating the real-time denitrification rate;
(2) calculating a real-time theoretical oxygen consumption rate R according to the real-time denitrification rate obtained in the step (1)1；
(3) Monitoring the real-time dissolved oxygen concentration and the real-time aeration rate in the wastewater, and calculating the real-time oxygen input rate R according to the formula (1)2(ii) a The formula (1) is as follows:
R2＝(a v+b)×(Cs-Ct’–t)×V (1)；
in the formula (1), R2Representing the real-time actual oxygen input rate; v represents the real-time aeration rate; a and b are the slope and intercept of the linear relation between the aeration rate and the total oxygen transfer coefficient measured before the aeration device is used; csRepresents the saturated dissolved oxygen concentration at real time temperature; ct’–tDenotes the average dissolved oxygen concentration value, C, over a period of time from t to tt’–t＝(Ct’+Ct)/2，Ct’Represents the dissolved oxygen concentration at time point t', CtRepresents the dissolved oxygen concentration at time t; v represents the reactor volume; t 'and t respectively represent two different running times in the anaerobic ammonia oxidation reaction process, and t' > t;
(4) using correction parameter k to real-time oxygen input rate R2Correcting to obtain a corrected real-time actual oxygen input rate R'2The correction formula is one of the following formulas:
(4-1) if NIt’>NItThen k is 2.23 Δ N/[2.23 Δ N +3.4 (NI)t’-NIt)+4.57(|NAt-NAt’|-0.15ΔN)]，ΔN＝(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)；
(4-2) if NIt’≤NItThen k equals 2.23 Δ N/[2.23 Δ N +4.57(| NA)t-NAt’|-0.15ΔN)]；ΔN＝(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)；
Wherein NIt’A concentration value representing the nitrite nitrogen concentration at time point t'; NItA concentration value representing the nitrite nitrogen concentration at time point t; k represents a correction parameter; NAtRepresents the concentration value of nitrate nitrogen at the time point t; NAt’Represents the concentration value of nitrate nitrogen at the time point of t'; NH (NH)tRepresenting the concentration value of ammonia nitrogen at the time point t; NH (NH)t’Representing the concentration value of ammonia nitrogen at the time point of t';
(5) adjusting the real-time aeration rate in real time according to the formulas provided in the step (3) and the step (4) to enable R'2Always with R1And (4) equaling until the whole reaction process is finished.
2. The intelligent real-time aeration control method for the anaerobic ammonia oxidation reaction process according to claim 1, wherein in the step (1), the calculation formula of the real-time denitrification rate is shown as a formula (2);
VN＝[(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)]/Δt (2)；
in the formula (2), VNRepresenting the real-time denitrification rate; NH (NH)tRepresenting the ammonia nitrogen concentration value at the t time point; NIt(ii) nitrite nitrogen concentration value representing the t time point; NAt(ii) a nitrate nitrogen concentration value representing the t time point; NHt’Representing the ammonia nitrogen concentration value of the t' time point; NIt’Nitrite nitrogen concentration value representing the t' time point; NAt’The nitrate nitrogen concentration value representing the t' time point; Δ t ═ t' -t.
3. The intelligent real-time aeration control method for the anammox reaction process according to claim 2, wherein in the step (2), the theoretical oxygen consumption rate R1The formula (3) is shown in the formula;
R1＝2.23VN (3)；
in the formula (3), R1Representing the real-time theoretical oxygen consumption rate, VNIndicating the real-time denitrification rate.
4. The intelligent real-time aeration control method for the anammox reaction process of claim 1, wherein the aeration is controlled by an intelligent real-time aeration control system;
the intelligent real-time aeration control system comprises an anaerobic ammonia oxidation reactor, an online water quality monitoring probe group, an aeration device and a data acquisition, analysis and control device; the aeration device comprises a fan, an air flow meter, a flow automatic control valve and an aeration head which are sequentially and electrically connected;
the aeration head is arranged at the bottom of the anaerobic ammonia oxidation reactor, and an online water quality monitoring probe group, namely an ammonia nitrogen monitoring probe, a nitrite nitrogen monitoring probe, a nitrate nitrogen monitoring probe and a dissolved oxygen monitoring probe, is arranged at the upper part of the anaerobic ammonia oxidation reactor; the data acquisition, analysis and control device is respectively and electrically connected with the online water quality monitoring probe group, the flow automatic control valve and the aeration head;
the method comprises the following specific steps:
(1) in an anaerobic ammonia oxidation reactor, monitoring real-time ammonia nitrogen concentration, real-time nitrite nitrogen concentration and real-time nitrate nitrogen concentration temperature of sewage by using an ammonia nitrogen monitoring probe, a nitrite nitrogen monitoring probe and a nitrate nitrogen monitoring probe, transmitting water quality data acquired by each probe to a data acquisition analysis and control device, and calculating real-time denitrification rate;
(2) calculating a real-time theoretical oxygen consumption rate R by using a data acquisition analysis and control device according to the real-time denitrification rate obtained in the step (1)1；
(3) Monitoring probe using dissolved oxygenMonitoring the real-time dissolved oxygen concentration of the sewage, monitoring the real-time aeration rate by an air flow meter, transmitting the data to a data acquisition, analysis and control device, and calculating the real-time oxygen input rate R according to the formula (1)2(ii) a The formula (1) is as follows:
R2＝(a v+b)×(Cs-Ct’–t)×V (1)；
in the formula (1), R2Representing a real-time oxygen input rate; v represents the real-time aeration rate; a and b are the slope and intercept of the linear relation between the aeration rate and the total oxygen transfer coefficient measured before the aeration device is used; csRepresents the saturated dissolved oxygen concentration at real time temperature; ct’–tDenotes the average dissolved oxygen concentration value, C, over a period of time from t to tt’–t＝(Ct’+Ct)/2，Ct’Represents the dissolved oxygen concentration at time point t', CtRepresents the dissolved oxygen concentration at time t; v represents the reactor volume; t 'and t respectively represent two different running times in the anaerobic ammonia oxidation reaction process, and t' is more than t;
(4) the data acquisition, analysis and control device adopts a correction parameter k to the real-time oxygen input rate R2Correcting to obtain a corrected real-time actual oxygen input rate R'2The correction formula is one of the following formulas:
(4-1) if NIt’>NItThen k is 2.23 Δ N/[2.23 Δ N +3.4 (NI)t’-NIt)+4.57(|NAt-NAt’|-0.15ΔN)]，ΔN＝(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)；
(4-2) if NIt’≤NItThen k equals 2.23 Δ N/[2.23 Δ N +4.57(| NA)t-NAt’|-0.15ΔN)]，ΔN＝(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)；
Wherein NIt’A concentration value representing the nitrite nitrogen concentration at time point t'; NItA concentration value representing the nitrite nitrogen concentration at time point t; k represents a correction parameter; NAtRepresents the t time pointThe concentration of nitrate nitrogen; NAt’Represents the concentration value of nitrate nitrogen at the time point of t'; NH (NH)tRepresenting the concentration value of ammonia nitrogen at the time point t; NH (NH)t’Representing the concentration value of ammonia nitrogen at the time point of t';
(5) controlling the opening and closing of the flow automatic control valve according to the formulas provided in the step (3) and the step (4), and adjusting the real-time aeration rate in real time to enable R'2Always with R1And (4) equaling until the whole reaction process is finished.
5. The intelligent real-time aeration control method for the anaerobic ammonia oxidation reaction process according to claim 4, wherein in the step (1), the calculation formula of the real-time denitrification rate is shown as a formula (2);
VN＝[(NHt+NIt+NAt)-(NHt’+NIt’+NAt’)]/Δt (2)；
in the formula (2), VNRepresenting the real-time denitrification rate; NH (NH)tExpressing the ammonia nitrogen concentration value at the time point t; NIt(ii) nitrite nitrogen concentration value representing the t time point; NAt(ii) a nitrate nitrogen concentration value representing the t time point; NH (NH)t’Representing the ammonia nitrogen concentration value of the t' time point; NIt’(ii) nitrite nitrogen concentration value representing the t' time point; NAt’The nitrate nitrogen concentration value representing the t' time point; Δ t ═ t' -t.
6. The intelligent real-time aeration control method for the anammox reaction process according to claim 5, wherein in the step (2), the theoretical oxygen consumption rate R1The formula (3) is shown in the formula;
R1＝2.23VN (3)；
in the formula (3), R1Representing the real-time theoretical oxygen consumption rate, VNIndicating the real-time denitrification rate.
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