A wastewater treatment plant nitrifier early warning system and early warning method

Abstract

This invention relates to the field of wastewater treatment technology and discloses a nitrifying bacteria early warning system and method for wastewater treatment plants. The early warning system includes a first reactor, a second reactor, and a central processing unit. Probes are installed in both the first and second reactors to detect the ammonia nitrogen concentration and pH value of the solutions in the first and second reactors, respectively. The central processing unit is connected to both the first and second probes to acquire and analyze the data detected by the probes. Based on the analysis results, it determines the activity status of nitrifying bacteria sludge in the nitrifying bacteria sludge tank and issues early warnings for wastewater that does not meet the requirements. The early warning system of this invention has a simple and reliable structure, a direct method, stronger targeting and applicability, higher matching degree, intuitive effect, quick and easy operation, and good repeatability, stability, and quality control capabilities.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an early warning system and method for nitrifying bacteria in wastewater treatment plants. Background Technology

[0002] Wastewater treatment plants, as indispensable public facilities in cities, are located at the end of the urban pipe network and bear the crucial responsibility of providing a safety net for the final discharge of urban water resources. Unlike domestic sewage, industrial wastewater contains large amounts of heavy metals, thiourea, toxic organic compounds, and other toxic and inhibitory substances, resulting in diverse, complex, and unstable discharge characteristics. Studies have shown that although these toxic substances are correlated to some extent with conventional physicochemical indicators, it is difficult to reflect the overall toxicity of the water quality through monitoring these indicators. Once the influent of a wastewater treatment plant is subjected to a strong impact of toxic substances, a large number of microorganisms at the biological treatment end of the plant may die from poisoning, inhibiting nitrification by nitrifying bacteria, and even leading to the collapse of the wastewater treatment biological system.

[0003] Currently, most integrated early warning devices for monitoring the influent water quality of wastewater treatment plants on the market use chemical methods to provide early warnings for wastewater with high inhibition of nitrifying bacteria and to determine the activity status of nitrifying bacteria sludge. The process of detecting nitrifying bacteria takes a long time, about an hour, and the accuracy of the measurement is poor due to the complexity of the water quality involved.

[0004] Therefore, how to provide a wastewater treatment plant nitrifying bacteria early warning system and method with short detection time and high measurement accuracy is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a nitrifying bacteria early warning system and method for wastewater treatment plants, in order to solve the problems of long detection time and poor measurement accuracy of nitrifying bacteria in the integrated early warning equipment for monitoring influent water quality of wastewater treatment plants in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] On one hand, the present invention provides a nitrifying bacteria early warning system for wastewater treatment plants, comprising:

[0008] The first reactor is connected to sewage and nitrifying sludge. The first reactor is equipped with a first probe for detecting the water quality parameters of the liquid in the first reactor.

[0009] The second reactor is connected to the parallel sample solution and the nitrifying sludge, and the deviation between the water quality parameters of the parallel sample solution and the water quality parameters of the wastewater is within the deviation threshold range. The second reactor is equipped with a second probe for detecting the water quality parameters of the liquid in the second reactor.

[0010] The central processing unit (CPU) is used to control the first reactor to be connected to wastewater and nitrifying sludge, and the second reactor to parallel sample solution and nitrifying sludge. The CPU is also connected to the first and second probes to acquire water quality parameters detected by the probes. The CPU generates water quality parameter curves based on the received water quality parameters and analyzes the acquired water quality parameters and water quality parameter curves. Based on the analysis results, the CPU determines the activity status of the nitrifying sludge in the nitrifying sludge tank and issues warnings for wastewater that does not meet the requirements.

[0011] Preferably, the water quality parameters include ammonia nitrogen concentration and pH value.

[0012] Preferably, the water quality parameter curve includes an ammonia nitrogen degradation slope curve.

[0013] Preferably, the system further includes a sampling mixing tank for collecting and containing wastewater, a nitrifying sludge tank for containing nitrifying sludge, and a solution preparation unit for preparing parallel sample solutions; the outlet of the sampling mixing tank is connected to the first reactor via a lift metering pump, the outlet of the nitrifying sludge tank is connected to the first reactor, the second reactor, and the nitrifying sludge tank via lift metering pumps respectively, and the outlet of the solution preparation unit is connected to the second reactor via a lift metering pump; each of the lift metering pumps is connected to the central processing unit.

[0014] Preferably, the sampling mixing tank, the first reactor, the second reactor, and the nitrifying bacteria sludge tank are all equipped with aeration devices.

[0015] Preferably, the solution preparation unit includes an ammonia nitrogen solution tank and a pH adjustment solution tank, both of which are connected to the inlet of the second reactor via a booster metering pump, which is connected to the central processing unit.

[0016] Preferably, it also includes a nitrifying bacteria nutrient solution tank, which is connected to the nitrifying bacteria sludge tank via a booster metering pump, and the booster metering pump is connected to the central processing unit.

[0017] On the other hand, the present invention also provides a method for early warning of nitrifying bacteria in wastewater treatment plants using any of the above-described systems, comprising:

[0018] Obtain the water quality parameters of the wastewater, and prepare parallel sample solutions based on the water quality parameters of the wastewater;

[0019] Wastewater and parallel sample solutions were mixed with nitrifying bacteria sludge to form a first solution and a second solution, respectively. Water quality parameters of the first solution and the second solution were obtained, and water quality parameter curves were formed based on the water quality parameters.

[0020] The water quality parameters and curves of the wastewater are analyzed and processed. Based on the analysis results, it is determined whether the influent water quality meets the requirements and an early warning signal is issued for wastewater that does not meet the requirements.

[0021] The water quality parameter curves are analyzed and processed, and the activity status of nitrifying bacteria sludge in the nitrifying bacteria sludge tank is determined based on the analysis results.

[0022] Preferably, the step of analyzing and processing the water quality parameters and curves of the wastewater, determining whether the influent water quality meets the requirements based on the analysis results, and issuing an early warning signal for wastewater that does not meet the requirements includes:

[0023] The water quality parameters of the wastewater were analyzed and processed to obtain the average ammonia nitrogen concentration C1 and the average pH value P1.

[0024] The average ammonia nitrogen concentration C1 is compared with the ammonia nitrogen concentration threshold C0. If C1 > C0, an early warning is issued that the ammonia nitrogen concentration in the wastewater is too high.

[0025] The average pH value P1 is compared with the pH threshold. If P1 is not within the pH threshold range, an early warning of abnormal pH value in wastewater is issued.

[0026] Preferably, the step of mixing wastewater and parallel sample solution with nitrifying bacteria sludge to form a first solution and a second solution, respectively, and obtaining water quality parameters for the first and second solutions, and generating a water quality parameter curve based on the water quality parameters, further includes:

[0027] The water quality parameters of the parallel sample solutions were obtained and analyzed to obtain the mean ammonia nitrogen concentration C2 and the mean pH value P2 of the parallel sample solutions.

[0028] The average ammonia nitrogen concentration C1 and average pH P1 of the wastewater are compared with the average ammonia nitrogen concentration C2 and average pH P2 of the parallel sample solution. If the deviations between C2 and C1 and between P2 and P1 are within the deviation threshold range, the parallel sample solution is qualified.

[0029] Preferably, the step of analyzing and processing the water quality parameters and curves of the wastewater, determining whether the influent water quality meets the requirements based on the analysis results, and issuing an early warning signal for wastewater that does not meet the requirements further includes:

[0030] The water quality parameter data of the first solution were analyzed and processed to obtain the ammonia nitrogen degradation slope K1.

[0031] The water quality parameter data of the second solution were analyzed and processed to obtain the ammonia nitrogen degradation slope K2.

[0032] Based on the ammonia nitrogen degradation slope K1 or the relationship between ammonia nitrogen degradation slope K1 and ammonia nitrogen degradation slope K2, the level of nitrifying bacteria inhibition hazard in the influent water quality is classified and an early warning signal is issued.

[0033] Preferably, the step of analyzing and processing the water quality parameter curves and determining the activity state of the nitrifying bacteria sludge in the nitrifying bacteria sludge tank based on the analysis results includes:

[0034] The ammonia nitrogen degradation slope K2 and the ammonia nitrogen degradation slope K y The comparisons were made, and the activity status of the nitrifying bacteria sludge in the nitrifying bacteria sludge tank was determined based on the comparison results; the K y The ammonia nitrogen degradation slope of a standard mixed solution formed from standard wastewater solution and standard activated nitrifying bacteria sludge;

[0035] If K2 and K y If the deviation is within the deviation threshold range, then the activity status of the nitrifying bacteria sludge in the nitrifying bacteria sludge tank is deemed qualified.

[0036] If K2 and K y If the deviation is not within the deviation threshold range, the activity state of the nitrifying bacteria sludge in the nitrifying bacteria sludge tank is deemed unqualified and the warning signal is invalid.

[0037] Preferably, the deviations between the average ammonia nitrogen concentration of the standard mixed solution and the average ammonia nitrogen concentration of the second solution, and between the average pH of the standard mixed solution and the average pH of the second solution, are all within the deviation threshold range.

[0038] This invention provides a nitrifying bacteria early warning system and method for wastewater treatment plants. Compared with existing technologies, its advantages are as follows:

[0039] The early warning system of this invention measures the water quality parameters of the wastewater introduced into the first reactor using a first probe. A central processing unit automatically prepares a parallel sample solution based on the water quality parameters measured by the first probe. A second probe monitors the water quality parameters of the parallel sample solution introduced into the second reactor in real time, ensuring that the deviation between the water quality parameters of the parallel sample solution introduced into the second reactor and the water quality parameters of the wastewater introduced into the first reactor is within a deviation threshold range. Then, the central controller controls the connection between the first reactor and the nitrifying bacteria sludge, and between the second reactor and the nitrifying bacteria sludge, mixing the cultured nitrifying bacteria sludge in the nitrifying bacteria sludge tank with the wastewater in the first reactor at a certain ratio to form a first solution. In a second reactor, nitrifying bacteria sludge is mixed with a parallel sample solution in a certain proportion to form a second solution. The water quality parameters of the first and second solutions are measured in real time using a first probe and a second probe, and the measured water quality parameters are transmitted to a central processor. The central processor generates a first ammonia nitrogen degradation curve and a second ammonia nitrogen degradation curve based on the received water quality parameters. The central controller provides an early warning for highly inhibitory nitrifying bacteria wastewater in the influent by comparing the slopes of the first and second ammonia nitrogen degradation curves. The accuracy of inhibitory wastewater detection is improved by using parallel sample solutions with the same pH and ammonia nitrogen concentration, avoiding the influence of different pH values ​​or ammonia nitrogen concentrations on the nitrification rate.

[0040] The early warning system of this invention stores the nitrification ammonia nitrogen degradation curves and slopes of standard mixed solutions with different pH values ​​and different initial ammonia nitrogen values ​​in the central processor. It uses the ammonia nitrogen degradation slope under nitrification aeration experimental conditions close to those of the second reactor as a control to quantify the activity status of nitrifying bacteria sludge in the nitrifying bacteria sludge tank, so as to determine whether the sludge in the nitrifying bacteria sludge tank is qualified.

[0041] The early warning system of this invention eliminates the impact of nitrifying bacteria sludge on water quality through the second reactor. Therefore, it can quantify the toxicity index of influent water quality and provide early warning of the toxicity of influent water quality of sewage treatment plants using different quantified water quality toxicity indexes. It has a simple and reliable structure, a direct method, stronger targeting and applicability, higher matching degree, intuitive effect, quick and easy operation, and good repeatability, stability and quality control capabilities. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the nitrifying bacteria early warning system for wastewater treatment plants according to an embodiment of the present invention.

[0044] In the diagram:

[0045] 100-Filter device, 200-Sampling mixing tank, 210-Raw water sampling pump, 300-First reactor, 400-Second reactor, 500-Nitrifying bacteria sludge tank, 510-Nitrifying bacteria nutrient solution tank, 610-Ammonia nitrogen solution tank, 620-pH adjustment solution tank, 700-Central processor, 810-First lift metering pump, 820-Second lift metering pump, 830-Third lift metering pump, 840-Fourth lift metering pump, 850-Fifth lift metering pump, 910-Fan, 920-Sewage discharge network. Detailed Implementation

[0046] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0047] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] like Figure 1As shown, some embodiments of the present invention provide a nitrifying bacteria early warning system for a wastewater treatment plant, which is installed at the upstream pipe network confluence point of the wastewater treatment plant. The system can automatically extract wastewater at the wastewater network under the control of a central processing unit at regular intervals. The early warning system includes a sampling mixing tank 200 for collecting and containing wastewater, a nitrifying bacteria sludge tank 500 for containing nitrifying bacteria sludge, a solution preparation unit for preparing parallel sample solutions, a first reactor 300, a second reactor 400, and a central processing unit 700. The bottoms of the sampling mixing tank 200, the first reactor 300, the second reactor 400, and the nitrifying bacteria sludge tank 500 are respectively connected to the sewage discharge network 920 through solenoid valves and pipelines. The solenoid valves are controlled by the central processing unit 700.

[0051] Among them, the deviation between the water quality parameters of the parallel sample solution and the water quality parameters of the wastewater in the sampling mixing tank 200 is within the deviation threshold range. The water quality parameters include ammonia nitrogen concentration and pH value, and the deviation threshold here is ±5%.

[0052] The first reactor 300 is connected to the outlet of the sampling mixing tank 200 and the nitrifying sludge tank 500, respectively, and is used to receive sewage and mix sewage and nitrifying sludge to form a first solution. The mixing ratio of sewage and nitrifying sludge is A:F. The first reactor 300 is equipped with a first probe for detecting the ammonia nitrogen concentration and pH value of sewage and the first solution in the first reactor 300.

[0053] The second reactor 400 is connected to the solution preparation unit and the outlet end of the nitrifying sludge tank 500, respectively, and is used to receive / prepare parallel sample solutions and mix parallel sample solutions and nitrifying sludge to form a second solution. The mixing ratio of parallel sample solutions and nitrifying sludge is A:F. The second reactor 400 is equipped with a second probe for detecting the ammonia nitrogen concentration and pH value of the parallel sample solutions and the second solution in the second reactor 400.

[0054] The central processing unit 700 is used to control the first reactor 300 to be connected to the sewage and nitrifying sludge respectively, and the second reactor 400 to be connected to the parallel sample solution and nitrifying sludge respectively. The central processing unit 700 is also connected to the first probe and the second probe respectively to acquire the water quality parameters detected by the first probe and the second probe. The central processing unit 700 generates a water quality parameter curve based on the received water quality parameters, and analyzes and processes the acquired water quality parameters and water quality parameter curve. Based on the analysis results, it determines the activity status of the nitrifying sludge in the nitrifying sludge tank 500, and issues an early warning for sewage that does not meet the requirements based on the analysis results.

[0055] Understandably, since the nitrifying sludge in both the first and second reactors originates from the same nitrifying sludge tank, and the ammonia nitrogen concentration and pH value of the wastewater and parallel sample solution are the same in both reactors, if the ammonia nitrogen concentration of the mixed solution in the first reactor decreases to a certain value and then cannot decrease further, while the ammonia nitrogen concentration of the mixed solution in the second reactor can continue to decrease, then the nitrifying sludge abnormality can be ruled out. It can be determined that other impurities or toxic substances in the wastewater are causing the excessively high ammonia nitrogen concentration, thus narrowing down the influencing factors. Alternatively, if the excessively high ammonia nitrogen concentration in the wastewater is caused by the inactivation of nitrifying sludge, then the ammonia nitrogen value changes similarly in the mixed solution of the first and second reactors and will differ significantly from the standard threshold in the central processing unit. In this case, it can be determined that the nitrifying sludge has been inactivated.

[0056] Optionally, it also includes a raw water sampling pump 210, the inlet end of which is connected to a filter device 100. The raw water sampling pump 210 is used to collect sewage from the pipe network, and its outlet end is connected to the inlet of the sampling mixing tank 200. A valve is provided on the outlet end pipe.

[0057] Optionally, the outlet of the sampling mixing tank 200 is connected to the first reactor 300 through the first lifting metering pump 810. The tank wall of the sampling mixing tank 200 is equipped with a water inlet distributor. The bottom of the sampling mixing tank 200 can be square, circular or other arbitrary shapes. A stirring device is installed at the bottom of the tank. The stirring device can be a blade-type stirrer for mechanical stirring or an aeration device through a blower 910 for aeration. An vent valve is installed at the bottom of the sampling mixing tank 200, and a filter device 100 or a primary sedimentation tank can be installed at the front end.

[0058] The sampling mixing tank 200 collects sewage from the pipeline network every x minutes and mixes the sewage every y minutes via the raw water sampling pump 210, where x and y can be x≥5 and y≥20. After multiple experiments, it was found that when the sewage from the pipeline network is collected every 5 minutes and mixed every 20 minutes, the sewage can be fully mixed, ensuring the uniformity and representativeness of the sampling, and effectively reducing the detection time and improving the detection efficiency.

[0059] Optionally, both the first reactor 300 and the second reactor 400 are equipped with annular water distributors at their inlet ends to flush the reactor walls. Both the first reactor 300 and the second reactor 400 are equipped with aeration devices at their bottom ends. The aeration devices can be aeration pipes, aeration discs, or other forms to ensure the continuous reaction between nitrifying bacteria sludge and wastewater in the reactor. In addition, the inner walls of the reactors are preferably treated to resist corrosion, and the outer walls of the reactors are insulated.

[0060] Optionally, the outlet of the nitrifying sludge tank 500 is connected to the inlet of the second lift metering pump 820, and the outlet of the second lift metering pump 820 is connected to the first reactor 300, the second reactor 400 and the nitrifying sludge tank 500 respectively through a solenoid valve.

[0061] The nitrifying sludge tank 500 carries nitrifying sludge and is equipped with an aeration device at its bottom for micro-aeration of the sludge inside the tank. Simultaneously, a second lift metering pump 820 enables self-circulation of the nitrifying sludge, ensuring its long-term activity. Furthermore, the same sludge is used in both the first and second reactors to avoid the impact of differences in activated sludge on the accuracy of judgment. The concentration of sludge in the nitrifying sludge tank 500 is set as i, preferably i ≥ 5000 mg / L, to maintain high activity of the nitrifying sludge.

[0062] Optionally, the solution preparation unit includes an ammonia nitrogen solution tank 610 and a pH adjustment solution tank 620. The outlet of the ammonia nitrogen solution tank 610 is connected to the inlet of the third lift metering pump 830, and the output of the third lift metering pump 830 is connected to the second reactor 400. The outlet of the pH adjustment solution tank 620 is connected to the inlet of the fourth lift metering pump 840, and the output of the fourth lift metering pump 840 is connected to the second reactor 400.

[0063] The bottom of the ammonia nitrogen solution tank 610 is equipped with a stirrer to make the ammonia nitrogen solution in the tank more uniformly mixed. The concentration of the ammonia nitrogen solution in the ammonia nitrogen solution tank 610 is set as z. The concentration of ammonia nitrogen solution z can be adjusted according to the actual situation. Preferably, z≥10mg / L, so as to better prepare parallel sample solutions.

[0064] Multiple pH adjustment solution tanks 620 can be provided, and each tank can hold alkaline solution, acidic solution and water respectively. For example, the alkaline solution can be sodium hydroxide, potassium hydroxide, etc., and the acidic solution can be dilute hydrochloric acid. After the pH adjustment solution is prepared in the pH adjustment solution tank 620 according to the instructions of the central processing unit 700, it can be delivered to the second reactor 400 by the fourth lift metering pump 840.

[0065] Optionally, it also includes a nitrifying bacteria nutrient solution tank 510. The outlet end of the nitrifying bacteria nutrient solution tank 510 is connected to the inlet end of the fifth lift metering pump 850, and the output end of the fifth lift metering pump 850 is connected to the nitrifying bacteria sludge tank 500. The nitrifying bacteria nutrient solution tank 510 contains nitrifying bacteria nutrient solution, which is pumped into the nitrifying bacteria sludge tank 500 through the fifth lift metering pump 850 in a timed and quantitative manner according to the instructions of the central processing unit 700, so as to provide nutrients for the nitrifying bacteria sludge and ensure the activity of the sludge.

[0066] Optionally, the air inlet of any aeration device is connected to a blower 910, and the air volume, air speed, start and stop of the blower 910 can be controlled according to the instructions of the central processing unit 700.

[0067] In other embodiments of the present invention, a method for early warning of nitrifying bacteria in a wastewater treatment plant is provided, comprising the following steps:

[0068] Step S100. Obtain the water quality parameters of the influent and wastewater, and analyze and process the water quality parameters to obtain the average ammonia nitrogen concentration C1 and the average pH value P1 of the wastewater.

[0069] In this step, water quality parameters include ammonia nitrogen concentration and pH value. The data port of the first probe is connected to the central processing unit for data recording and processing. A ml of mixed wastewater is extracted every x minutes within a y-minute period and fed into the first reactor. The ammonia nitrogen concentration of the wastewater in the first reactor is measured n times using the first probe, ranging from b1 mg / L to b... n mg / L, and read the average ammonia nitrogen concentration in the wastewater as C1 by the central processing unit; pH value was measured m times, from c1 to c m The CPU reads the average pH value P1 of the wastewater calculated by the central processing unit, where A≥100, n≥2, and m≥2.

[0070] Step S200. Compare the average ammonia nitrogen concentration C1 and the average pH value P1 of the wastewater with preset thresholds to determine whether the influent water quality is high ammonia nitrogen wastewater and whether the pH value is qualified.

[0071] In this step, the average ammonia nitrogen concentration C1 in the wastewater is compared with the ammonia nitrogen concentration threshold C0. If C1 > C0, the central processing unit issues a warning that the ammonia nitrogen concentration in the wastewater is too high. The average pH value P1 in the wastewater is compared with the pH threshold. If P1 is not within the pH threshold range, the central processing unit issues a warning that the pH value of the wastewater is abnormal. If C1 ≤ C0 and P1 is within the pH threshold range, the next step is performed.

[0072] For example, if the ammonia nitrogen concentration threshold C0 is set to 10 mg / L and the pH threshold is 6-9, if C1 ≤ 10 mg / L and 6 < P1 < 9, then proceed to the next step; if C1 > 10 mg / L, then the central processing unit directly issues an early warning that the ammonia nitrogen concentration in the wastewater is too high; if P1 ≥ 9 or P1 ≤ 6, then the central processing unit issues an early warning that the pH value of the wastewater is abnormal. More specifically, the central processing unit can issue an early warning that the pH value is abnormally high or abnormally low. The warning level for these situations can be classified as level 0.

[0073] Step S300. Prepare parallel sample solutions based on the water quality parameter information of the wastewater and obtain the water quality parameter information of the parallel sample solutions. Analyze and process the water quality parameter information of the parallel sample solutions to obtain the average ammonia nitrogen concentration C2 and the average pH value P2 of the parallel sample solutions.

[0074] In this step, the data port of the second probe is connected to the central processing unit for data recording and processing. A ml of parallel sample solution is drawn into the second reactor. The ammonia nitrogen concentration of the parallel sample solution is detected n times by the second probe and read to the central processing unit. The average ammonia nitrogen concentration of the parallel sample solution is calculated as C2. The pH value of the parallel sample solution is detected m times and read to the central processing unit. The average pH value is calculated as P2, where A≥100, n≥2, and m≥2.

[0075] Step S400. Compare the average ammonia nitrogen concentration C1 and average pH P1 of the wastewater with the average ammonia nitrogen concentration C2 and average pH P2 of the parallel sample solution to determine whether the parallel sample solution is qualified.

[0076] In this step, the average ammonia nitrogen concentration C1 and average pH P1 of the wastewater are compared with the average ammonia nitrogen concentration C2 and average pH P2 of the parallel sample solution. If the deviations between C1 and C2 and between P1 and P2 are within the deviation threshold range, the parallel sample solution is qualified. The deviation threshold here is preferably ±5%. Otherwise, it is prepared again to ensure the accuracy of the measurement.

[0077] Step S500. Obtain water quality parameter information of the first solution formed by mixing sewage and nitrifying bacteria sludge, and analyze and process the obtained water quality parameter information to obtain the ammonia nitrogen degradation slope K1; obtain water quality parameter information of the second solution formed by mixing parallel sample solution and nitrifying bacteria sludge, and analyze and process the obtained water quality parameter information to obtain the ammonia nitrogen degradation slope K2.

[0078] In this step, the nitrifying sludge tank pumps nitrifying sludge into the first reactor and the second reactor respectively via the second lift metering pump, with each pump being Fml, satisfying A:F≥1. The aeration devices of the first reactor and the second reactor are then turned on to carry out nitrification aeration reaction for G minutes, with y≥G≥20.

[0079] The central processing unit records the ammonia nitrogen concentration of the mixed solution in the first reactor every second, and calculates the average ammonia nitrogen value from J1 mg / L to J every H seconds. K mg / L, and fitted the ammonia nitrogen time curve to obtain the ammonia nitrogen degradation slope K1 mg / (L·h); the ammonia nitrogen concentration of the mixed solution in the second reactor was recorded every second by the central processing unit, and the average ammonia nitrogen every H seconds was calculated from L1 mg / L to L... K mg / L, and fitted the ammonia nitrogen time curve to obtain the ammonia nitrogen degradation slope K2mg / (L·h).

[0080] Step S600. Based on the ammonia nitrogen degradation slope K1 or the relationship between ammonia nitrogen degradation slope K1 and ammonia nitrogen degradation slope K2, classify the nitrification bacteria inhibition hazard level of the influent water quality and issue an early warning signal.

[0081] In this step, if the ammonia nitrogen degradation slope K1 ≥ 0, a warning signal of Level I nitrifying bacteria inhibition hazard level is issued; if 0.2 ≥ K1 / K2 > 0, a warning signal of Level II nitrifying bacteria inhibition hazard level is issued; if 0.4 ≥ K1 / K2 > 0.2, a warning signal of Level III nitrifying bacteria inhibition hazard level is issued; if 0.6 ≥ K1 / K2 > 0.4, a warning signal of Level IV nitrifying bacteria inhibition hazard level is issued; and if 0.8 ≥ K1 / K2 > 0.6, a warning signal of Level V nitrifying bacteria inhibition hazard level is issued. It should be noted that the above warning signal levels and the range of K1 / K2 can be adjusted according to the actual situation.

[0082] Step S700. The ammonia nitrogen degradation slope K2 and the ammonia nitrogen degradation slope K... y The results were compared, and the activity status of the nitrifying bacteria sludge in the nitrifying bacteria sludge tank was determined based on the comparison results.

[0083] In this step, K y The ammonia nitrogen degradation slope is defined as the standard mixed solution formed by standard wastewater solution and standard activated nitrifying bacteria sludge. The deviations between the average ammonia nitrogen concentration of the standard mixed solution and the average ammonia nitrogen concentration of the second solution, and between the average pH of the standard mixed solution and the average pH of the second solution, are all within the deviation threshold range.

[0084] It should be noted that the ammonia nitrogen degradation slopes of the nitrification aeration experiments conducted after mixing standard wastewater solutions Aml with different pH values ​​and ammonia nitrogen concentrations with standard activated nitrifying bacteria sludge Fml of concentration i were recorded in the central processing unit. The ammonia nitrogen degradation slope K was selected. y mg / (L·h), real-time K y Compare with K2.

[0085] If K2 and K y If the deviation is within the deviation threshold range, then the activity state of the nitrifying bacteria sludge in the nitrifying bacteria sludge tank is deemed qualified; if K2 and K y If the deviation is not within the deviation threshold range, the activity status of the nitrifying bacteria sludge in the nitrifying bacteria sludge tank is deemed unqualified and the warning signal is invalid. The system will remind maintenance personnel to replace the nitrifying bacteria sludge in the nitrifying bacteria sludge tank or to introduce nitrifying bacteria nutrient solution according to the instructions of the central controller. The deviation threshold can be ±10%.

[0086] Example 1

[0087] At a certain moment, sewage from the pipeline network is filtered and then pumped to the sampling mixing tank by the raw water sampling pump. 10L of sewage is sampled every 15 minutes. After four samplings, the aeration device at the bottom of the sampling mixing tank is turned on and aerated and stirred for one minute. The first lifting metering pump sends the mixed sewage to the first reactor. The solenoid valve is opened and the sewage enters the water distributor to flush the first reactor for one minute. After flushing, 3.5L of sewage enters the first reactor.

[0088] The central processing unit measured the ammonia nitrogen concentration and pH value of the wastewater in the first reactor 10 times using the first probe, and obtained an average ammonia nitrogen concentration of 15.2 mg / L and an average pH value of 7.5.

[0089] Based on the analysis results of the wastewater, the central processing unit sends signals to the third and fourth booster metering pumps to prepare a parallel sample solution with an average ammonia nitrogen concentration of 15.2 mg / L and an average pH of 7.5 by extracting ammonia nitrogen solution (40 mg / L) and pH adjustment solution, which is then added to the second reactor.

[0090] The central processing unit measured the ammonia nitrogen concentration and pH value of the parallel sample solution in the second reactor 10 times through the second probe, and found that the average ammonia nitrogen concentration of the parallel sample solution was 15.1 mg / L and the average pH value was 7.4. The deviation value was less than 5%, and the parallel sample solution was qualified.

[0091] Nitrifying sludge was fed from the nitrifying sludge tank into the first reactor and the second reactor in 1.5L each via a second lift metering pump. Then, the first and second reactors started aeration. The central processor recorded the ammonia nitrogen concentration value every 20 seconds via a probe. By recording 61 sets of ammonia nitrogen concentration values ​​in the first and second reactors over 20 minutes, the ammonia nitrogen degradation curve was fitted, and the ammonia nitrogen degradation slope K1 was calculated to be -2.5mg / (L·h) and the ammonia nitrogen degradation slope K2 was calculated to be -4mg / (L·h).

[0092] The central processing unit reads the average ammonia nitrogen concentration of the standard mixed solution in the adjacent database of the system library as 15 mg / L, and the average pH value as 7.4. The K3 value is -4.1 mg / (L·h). Therefore, the K2 / K3 ratio is 97.56%, and the deviation value is less than 10%, which means that the nitrifying bacteria sludge is qualified and the measurement data is accurate. The K1 / K2 ratio is 0.625. According to the alarm rules, this sewage warning information indicates that the nitrifying bacteria inhibition hazard level is Level V.

[0093] Example 2

[0094] At a certain moment, sewage from the pipeline network is filtered and then pumped to the sampling mixing tank by the raw water sampling pump. 10L of sewage is sampled every 15 minutes. After four samplings, the aeration device at the bottom of the sampling mixing tank is turned on and aerated and stirred for one minute. The first lifting metering pump sends the mixed sewage to the first reactor. The solenoid valve is opened and the sewage enters the water distributor to flush the first reactor for one minute. After flushing, 3.5L of sewage enters the first reactor.

[0095] The central processing unit measured the ammonia nitrogen concentration and pH value of the wastewater in the first reactor 10 times using the first probe, and obtained the average ammonia nitrogen concentration of 10.2 mg / L and the average pH value of 7.4.

[0096] Based on the analysis results of the wastewater, the central processing unit sends signals to the third and fourth booster metering pumps to prepare a parallel sample solution with an average ammonia nitrogen concentration of 10.2 mg / L and an average pH of 7.4 by extracting ammonia nitrogen solution (40 mg / L) and pH adjustment solution, and then pumps 3.5 L of the solution into the second reactor.

[0097] The central processing unit (CPU) measured the ammonia nitrogen concentration and pH value of the parallel sample solution in the second reactor 10 times using the second probe. The average ammonia nitrogen concentration and average pH value of the parallel sample solution were found to be 12.1 mg / L and 8.4, respectively. The deviation was greater than 5%, indicating that the parallel sample preparation was unqualified. The second reactor was then emptied. After emptying, the CPU measured the ammonia nitrogen concentration and pH value of the wastewater in the second reactor 10 times again using the second probe. The average ammonia nitrogen concentration and average pH value of the wastewater were found to be 10.1 mg / L and 7.4, respectively. The deviation was less than 5%, indicating that the parallel sample solution preparation was qualified.

[0098] Nitrifying sludge was fed from the nitrifying sludge tank into the first and second reactors in 1.5L increments via a second lift metering pump. Aeration then commenced in both reactors. The central processing unit recorded ammonia nitrogen concentration values ​​every 20 seconds using a probe. By fitting ammonia nitrogen degradation curves to 61 sets of ammonia nitrogen concentration values ​​recorded over 20 minutes in both reactors, the ammonia nitrogen degradation slopes K1 and K2 were calculated to be -3.5 mg / (L·h) and -3 mg / (L·h), respectively.

[0099] The central processing unit reads that the average ammonia nitrogen concentration of the standard mixed solution in the adjacent database of the system library is 10 mg / L, and the average pH is 7.4. K3 is -3.1 mg / (L·h). Therefore, K2 / K3 is 96.77%, and the deviation value is less than 10%, which means that the nitrifying sludge is qualified and the measurement data is accurate. K1 / K2 is 1.167. According to the alarm rules, there is no alarm for this sewage warning.

[0100] Example 3

[0101] At a certain moment, sewage from the pipeline network, after passing through the filtration device, is pumped to the sampling mixing tank by the raw water sampling pump. 10L of sewage is sampled every 15 minutes. After four samplings, the aeration device at the bottom of the sampling mixing tank is activated, and aeration and mixing occur for one minute. The first lift metering pump sends the mixed sewage to the first reactor. The solenoid valve opens, and the sewage enters the water distributor, rinsing the first reactor for one minute. After rinsing, 3.5L of sewage enters the first reactor.

[0102] The central processing unit measured the ammonia nitrogen concentration and pH value of the wastewater in the first reactor 10 times through the first probe, and obtained the average ammonia nitrogen concentration of 8.2 mg / L and the average pH value of 7.5.

[0103] Based on the analysis results of the wastewater, the central processing unit sends signals to the third and fourth booster metering pumps to prepare a parallel sample solution with an average ammonia nitrogen concentration of 8.2 mg / L and an average pH of 7.5 by extracting ammonia nitrogen solution (40 mg / L) and pH adjustment solution, which is then added to the second reactor.

[0104] The central processing unit measured the ammonia nitrogen concentration and pH value of the parallel sample solution in the second reactor 10 times through the second probe, and found that the average ammonia nitrogen concentration of the parallel sample solution was 8.1 mg / L and the average pH value was 7.4. The deviation value was less than 5%, and the parallel sample solution was qualified.

[0105] Nitrifying sludge was fed from the nitrifying sludge tank into the first reactor and the second reactor in 1.5L each via a second lift metering pump. Then, the first and second reactors started aeration. The central processor recorded the ammonia nitrogen concentration value every 20 seconds via a probe. By recording 61 sets of ammonia nitrogen concentration values ​​in the first and second reactors over 20 minutes, the ammonia nitrogen degradation curve was fitted, and the ammonia nitrogen degradation slope K1 was calculated to be -0.5mg / (L·h) and the ammonia nitrogen degradation slope K2 was calculated to be -3mg / (L·h).

[0106] The central processing unit reads the average ammonia nitrogen concentration of the standard mixed solution in the adjacent database of the system library as 15 mg / L, and the average pH value as 7.4. The K3 value is -3.1 mg / (L·h). Therefore, the K2 / K3 ratio is 96.77%, and the deviation value is less than 10%, which means that the nitrifying bacteria sludge is qualified and the measurement data is accurate. The K1 / K2 ratio is 0.167. According to the alarm rules, this sewage warning information indicates that the nitrifying bacteria inhibition hazard level is Level II.

[0107] Example 4

[0108] At a certain moment, sewage from the pipeline network, after passing through the filtration device, is pumped to the sampling mixing tank via a raw water sampling pump. 10L of sewage is sampled every 15 minutes. After four samplings, the aeration device at the bottom of the sampling mixing tank is activated, aerating and stirring for one minute. The first lift metering pump then sends the mixed sewage to the first reactor. The solenoid valve opens, and the sewage enters the water distributor, rinsing the first reactor for one minute. After rinsing, 3.5L of sewage enters the first reactor.

[0109] The central processing unit measured the ammonia nitrogen concentration and pH value of the wastewater in the first reactor 10 times through the first probe, and obtained the average ammonia nitrogen concentration of 8.2 mg / L and the average pH value of 7.5.

[0110] Based on the analysis results of the wastewater, the central processing unit sends signals to the third and fourth lift metering pumps to prepare a parallel sample of 3.5L with an average ammonia nitrogen concentration of 8.2mg / L and an average pH of 7.5 by extracting ammonia nitrogen solution (40mg / L) and pH adjustment solution to the second reactor.

[0111] The central processing unit measured the ammonia nitrogen concentration and pH value of the parallel sample solution in the second reactor 10 times through the second probe, and found that the average ammonia nitrogen concentration of the parallel sample solution was 8.1 mg / L and the average pH value was 7.4. The deviation value was less than 5%, and the parallel sample solution was qualified.

[0112] Nitrifying sludge was fed from the nitrifying sludge tank into the first and second reactors in 1.5L increments via a second lift metering pump. Aeration then commenced in both reactors. The central processing unit recorded ammonia nitrogen concentration values ​​every 20 seconds using a probe. By fitting ammonia nitrogen degradation curves based on 61 sets of ammonia nitrogen concentration values ​​recorded over 20 minutes in both reactors, the ammonia nitrogen degradation slope K1 was calculated to be 0.5 mg / (L·h), and the ammonia nitrogen degradation slope K2 was calculated to be -3 mg / (L·h).

[0113] The central processing unit reads the average ammonia nitrogen concentration of the standard mixed solution in the adjacent database of the system library as 15 mg / L, and the average pH value as 7.4. The K3 value is -3.1 mg / (L·h). Therefore, the K2 / K3 ratio is 96.77%, and the deviation value is less than 10%, which means that the nitrifying bacteria sludge is qualified and the measurement data is accurate. K1≥0. According to the alarm rules, this sewage warning information is an alarm for the level I nitrifying bacteria inhibition hazard.

[0114] Example 5

[0115] At a certain moment, sewage from the pipeline network is filtered and then pumped to the sampling mixing tank by the raw water sampling pump. 10L of sewage is sampled every 15 minutes. After four samplings, the aeration device at the bottom of the sampling mixing tank is turned on and aerated and stirred for one minute. The first lifting metering pump sends the mixed sewage to the first reactor. The solenoid valve is opened and the sewage enters the water distributor to flush the first reactor for one minute. After flushing, 3.5L of sewage enters the first reactor.

[0116] The central processing unit measured the ammonia nitrogen concentration and pH value of the wastewater in the first reactor 10 times using the first probe, and obtained an average ammonia nitrogen concentration of 45 mg / L and an average pH value of 9.1.

[0117] The central processing unit immediately determined that the average ammonia nitrogen concentration in the wastewater was 45 mg / L, which is greater than the ammonia nitrogen solution concentration threshold (40 mg / L), and the average pH value was ≥9. According to the alarm rules, the wastewater warning information was set at alarm level 0, indicating high ammonia nitrogen wastewater and abnormal pH wastewater.

[0118] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method for early warning of nitrifying bacteria in wastewater treatment plants, characterized in that, A nitrifying bacteria early warning system for wastewater treatment plants is adopted. The nitrifying bacteria early warning system for wastewater treatment plants includes: A sampling mixing tank is used to collect and contain wastewater; Nitrifying bacteria sludge tank, used to contain nitrifying bacteria sludge; Solution preparation unit, used to prepare parallel sample solutions; The first reactor is connected to the outlet of the sampling mixing tank and the nitrifying sludge tank respectively. The first reactor is equipped with a first probe for detecting the water quality parameters of the liquid in the first reactor. The second reactor is connected to the outlet of the solution preparation unit and the nitrifying bacteria sludge tank, respectively. The second reactor is equipped with a second probe for detecting the water quality parameters of the liquid in the second reactor. The central processing unit (CPU) is used to control the first reactor to be connected to the wastewater and nitrifying sludge respectively, and the second reactor to the parallel sample solution and nitrifying sludge respectively. The CPU is also connected to the first and second probes to acquire the water quality parameters detected by the first and second probes. The CPU generates a water quality parameter curve based on the received water quality parameters, analyzes and processes the acquired water quality parameters and water quality parameter curve, determines the activity status of the nitrifying sludge in the nitrifying sludge tank based on the analysis results, and issues an early warning for wastewater that does not meet the requirements based on the analysis results. Aeration devices are installed in the sampling mixing tank, the first reactor, the second reactor, and the nitrifying bacteria sludge tank; The early warning method for nitrifying bacteria in wastewater treatment plants includes the following steps: Wastewater from the sampling mixing tank is sent to the first reactor to obtain water quality parameters of the wastewater in the first reactor. Parallel sample solutions are prepared based on the water quality parameters of the wastewater, including ammonia nitrogen concentration and pH value. The deviation between the water quality parameters of the parallel sample solution and the water quality parameters of the wastewater is within the deviation threshold range. The parallel sample solution is then sent to the second reactor. Nitrifying sludge is fed from the nitrifying sludge tank into the first reactor and the second reactor respectively. Then, the first reactor and the second reactor are aerated. Wastewater and parallel sample solution are mixed with nitrifying sludge to form the first solution and the second solution respectively. The ammonia nitrogen concentration of the first solution and the second solution are obtained respectively. Based on the ammonia nitrogen concentration value, the ammonia nitrogen degradation curve is fitted, and the ammonia nitrogen degradation slope K1 and the ammonia nitrogen degradation slope K2 are calculated respectively. The water quality parameters of the wastewater in the first reactor are analyzed and processed to obtain the average ammonia nitrogen concentration C1 and the average pH value P1 of the wastewater. C1 and P1 are compared with the ammonia nitrogen concentration threshold C0 and the pH threshold, respectively. Based on the comparison results, it is determined whether the influent water quality meets the requirements and an early warning signal is issued for wastewater that does not meet the requirements. Based on the ammonia nitrogen degradation slope K1 value and the ratio of K1 to K2, the inhibition hazard level of nitrifying bacteria in the influent water quality is classified and an early warning signal is issued. The ammonia nitrogen degradation slope K2 and the ammonia nitrogen degradation slope K y The K was compared, and the activity status of the nitrifying bacteria sludge in the nitrifying bacteria sludge tank was determined based on the comparison results. y The slope of ammonia nitrogen degradation is given by a standard mixed solution formed from standard wastewater solution and standard activated nitrifying bacteria sludge.

2. The method for early warning of nitrifying bacteria in wastewater treatment plants according to claim 1, characterized in that, The effluent end of the sampling mixing tank is connected to the first reactor via a lift metering pump. The effluent end of the nitrifying sludge tank is connected to both the first reactor and the second reactor via lift metering pumps. The effluent end of the solution preparation unit is connected to the second reactor via a lift metering pump. Each of the lift metering pumps is connected to the central processing unit.

3. The method for early warning of nitrifying bacteria in wastewater treatment plants according to claim 2, characterized in that, The solution preparation unit includes an ammonia nitrogen solution tank and a pH adjustment solution tank. Both the ammonia nitrogen solution tank and the pH adjustment solution tank are connected to the inlet of the second reactor via a booster metering pump, which is connected to the central processing unit.

4. The method for early warning of nitrifying bacteria in wastewater treatment plants according to claim 2, characterized in that, The wastewater treatment plant nitrifying bacteria early warning system also includes a nitrifying bacteria nutrient solution tank, which is connected to the nitrifying bacteria sludge tank via a lift metering pump, and the lift metering pump is connected to the central processing unit.

5. The method for early warning of nitrifying bacteria in wastewater treatment plants according to claim 1, characterized in that, The average ammonia nitrogen concentration C1 is compared with the ammonia nitrogen concentration threshold C0. If C1 > C0, an early warning is issued that the ammonia nitrogen concentration in the wastewater is too high. The average pH value P1 is compared with the pH threshold. If P1 is not within the pH threshold range, an early warning of abnormal pH value in wastewater is issued.

6. The method for early warning of nitrifying bacteria in wastewater treatment plants according to claim 1, characterized in that, Before the step of mixing the wastewater and parallel sample solution with nitrifying bacteria sludge to form the first solution and the second solution, the following steps are also included: The water quality parameters of the parallel sample solutions were obtained and analyzed to obtain the average ammonia nitrogen concentration C2 and the average pH value P2 of the parallel sample solutions. The average ammonia nitrogen concentration C1 and average pH P1 of the wastewater are compared with the average ammonia nitrogen concentration C2 and average pH P2 of the parallel sample solution. If the deviations between C2 and C1 and between P2 and P1 are within the deviation threshold range, the parallel sample solution is qualified.

7. The method for early warning of nitrifying bacteria in wastewater treatment plants according to claim 1, characterized in that, The method of classifying the nitrifying bacteria inhibition hazard level of influent water quality and issuing early warning signals based on the ammonia nitrogen degradation slope K1 value and the ratio of K1 to K2 includes: If K1≥0, a warning signal of Level I nitrifying bacteria inhibition hazard level is issued; if 0.2≥K1 / K2>0, a warning signal of Level II nitrifying bacteria inhibition hazard level is issued; if 0.4≥K1 / K2>0.2, a warning signal of Level III nitrifying bacteria inhibition hazard level is issued; if 0.6≥K1 / K2>0.4, a warning signal of Level IV nitrifying bacteria inhibition hazard level is issued; if 0.8≥K1 / K2>0.6, a warning signal of Level V nitrifying bacteria inhibition hazard level is issued.

8. The method for early warning of nitrifying bacteria in wastewater treatment plants according to claim 1, characterized in that, The ammonia nitrogen degradation slope K2 and ammonia nitrogen degradation slope K y The comparison was conducted, and the activity status of the nitrifying bacteria sludge in the nitrifying bacteria sludge tank was determined based on the comparison results, including: If K2 and K y If the deviation is within the deviation threshold range, then the activity status of the nitrifying bacteria sludge in the nitrifying bacteria sludge tank is deemed qualified. If K2 and K y If the deviation is not within the deviation threshold range, the activity state of the nitrifying bacteria sludge in the nitrifying bacteria sludge tank is deemed unqualified and the warning signal is invalid.

9. The method for early warning of nitrifying bacteria in wastewater treatment plants according to claim 1, characterized in that, The deviations between the average ammonia nitrogen concentration of the standard mixed solution and the average ammonia nitrogen concentration of the second solution, as well as the deviations between the average pH of the standard mixed solution and the average pH of the second solution, are all within the deviation threshold range.

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