Ammonia-containing wastewater treatment method and device

Abstract

The invention relates to an ammonia-containing wastewater treatment method and an ammonia-containing wastewater treatment device. The ammonia-containing wastewater treatment device mainly structurally comprises an ammonia wastewater accommodating tank for storing ammonia-containing wastewater, at least one ammonia nitrogen detection element for detecting the ammonia nitrogen content of the ammonia-containing wastewater, at least one aeration device connected with the ammonia wastewater accommodating tank, and an oxygen transfer coefficient calculation device in information connection with the aeration device, and an aeration time control piece and a gas flow control piece are arranged on the aeration device. Therefore, by adjusting the output time and the output quantity per unit time of the aeration device and calculating the relationship between the oxygen transfer coefficient and the aeration flow of the aeration device, the total mass of oxygen entering the ammonia wastewater treatment tank is accurately controlled, and then the ratio of the mass of ammonia nitrogen to the mass of oxygen is controlled, so that the ammonia nitrogen is only oxidized into nitrite before being oxidized into nitrate, and the ammonia nitrogen is only oxidized into nitrite before being oxidized into nitrate. And reacting with the remaining ammonia nitrogen to obtain nitrogen, thereby achieving a high-efficiency, high-accuracy and non-toxic ammonia wastewater treatment result.

Description

Technical Field

[0001] The present invention provides a method and device for treating ammonia-containing wastewater, which can accurately control the ammonia oxidation reaction to enter the anaerobic ammonia oxidation reaction. Background Art

[0002] Ammonia nitrogen refers to ammonia (NH3) or ammonium (NH4 + ) ion form of combined ammonia, which is the most harmful form of nitrogen among all types and an indicator of water pollution. Its harm to the aquatic ecological environment is manifested in many aspects. Most of the ammonia nitrogen in wastewater comes from organic matter or nitrogen-containing chemicals. Generally, ammonia nitrogen is reduced to nitrogen gas by the metabolism of microorganisms. The reactions of this mechanism are mainly nitrification and denitrification. However, this mechanism is a high-energy-consuming process that requires the provision of organic carbon sources, and is gradually replaced by anaerobic ammonia oxidation reactions, which have the advantages of shorter reaction paths, lower aeration power, less dosage, and lower sludge production.

[0003] However, the above-mentioned operation control strategy of anaerobic ammonium oxidation reaction mainly relies on controlling the pH value, temperature, aeration volume and sludge retention time in the control system to inhibit the activity of nitrate bacteria and prevent nitrite nitrogen from being oxidized to nitrate nitrogen. However, the above-mentioned control strategy has the following problems and shortcomings when used and needs to be improved:

[0004] First, the common method of controlling dissolved oxygen concentration has a high error value in the actual control of oxygen content because it involves the ever-changing total water volume and ammonia nitrogen concentration, as well as temperature changes affected by the environment. If the dissolved oxygen concentration is too low, it will not promote the reaction. If the dissolved oxygen concentration is too high, nitrite will be over-oxidized to nitrate and anaerobic ammonia-oxidizing bacteria will be inhibited.

[0005] Second, since part of the ammonia nitrogen is converted into nitrite nitrogen, it will consume the alkalinity in the water and lower the pH value, which requires the addition of alkali agents to adjust. Otherwise, the ammonia oxidation rate and the total nitrogen removal rate will continue to decrease. However, this control method cannot limit the growth of nitrate bacteria.

[0006] Therefore, how to solve the above common problems and shortcomings is the direction that the applicant of the present invention and related manufacturers engaged in this industry want to study and improve. Summary of the invention

[0007] In view of the above-mentioned shortcomings, the applicant of the present invention has collected relevant information, conducted multiple evaluations and considerations, and based on many years of experience accumulated in this industry, through continuous trials and modifications, has designed a method and device for treating ammonia-containing wastewater that can accurately control the ammonia oxidation reaction to enter the anaerobic ammonia oxidation reaction.

[0008] The main purpose of the present invention is to avoid controlling the dissolved oxygen concentration in water and utilize the relationship between the oxygen transfer coefficient of the aeration device and the aeration flow rate to accurately control the ratio of the mass of ammonia nitrogen to the mass of oxygen, so that the ammonia nitrogen is only oxidized to nitrite before being oxidized to nitrate, and reacts with the remaining ammonia nitrogen to form nitrogen, thereby achieving high-efficiency, high-accuracy, and non-toxic ammonia wastewater treatment results.

[0009] To achieve the above-mentioned purpose, the main structure of the present invention includes: an ammonia wastewater storage tank, at least one ammonia nitrogen detection element, at least one aeration device, and an oxygen transfer coefficient calculation device. The ammonia wastewater storage tank is used to store ammonia-containing wastewater. The ammonia nitrogen detection element can detect the ammonia nitrogen content of the ammonia-containing wastewater. The aeration device is connected to the ammonia wastewater storage tank to input oxygen-containing gas into the ammonia wastewater storage tank. The aeration device is provided with an aeration time control component for controlling the output time and a gas flow control component for controlling the output per unit time. The oxygen transfer coefficient calculation device is connected to the aeration device to calculate the relationship between the oxygen transfer coefficient of the aeration device and the aeration flow rate, and then the aeration device is operated to maintain the ratio of the mass of ammonia nitrogen to the mass of oxygen in the ammonia-containing wastewater participating in the ammonia oxidation reaction at 1:1.5 to 1:2.

[0010] When using the ammonia-containing wastewater treatment method of the present invention, the user first sets an ammonia nitrogen detection element in the ammonia wastewater storage tank to detect the ammonia nitrogen content of the ammonia-containing wastewater, and uses an aeration device to input oxygen-containing gas into the ammonia wastewater storage tank. At the same time, according to the output time and the output per unit time set by the aeration time control component and the gas flow control component, the aeration amount of the aeration device is calculated and recorded. The oxygen transfer coefficient calculation device can be used to calculate the relationship between the oxygen transfer coefficient of the aeration device and the aeration flow rate, so as to accurately control the aeration device so that the ratio of the ammonia nitrogen mass participating in the ammonia oxidation reaction to the oxygen mass in the ammonia-containing wastewater is maintained at 1:1.5 to 1:2, thereby making the ammonia nitrogen (NH4 + ) is oxidized to nitrate (NO3 - ) before being oxidized to nitrite (NO2 - ), the remaining ammonia nitrogen directly enters the anaerobic ammonium oxidation reaction. Therefore, by mastering the relationship between the oxygen transfer coefficient and the aeration flow rate, the ratio of ammonia nitrogen mass to oxygen mass can be accurately and freely controlled to improve the overall reaction efficiency.

[0011] By means of the above technology, it is possible to overcome the problems existing in the operation control strategy of the common ammonia oxidation reaction combined with the anaerobic ammonia oxidation reaction, such as the high error value of the dissolved oxygen concentration control method for the control degree of oxygen content, and the relatively unstable control method of adding alkaline agents to adjust the pH value of water, thereby achieving the practical progress of the above advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The figure is a flowchart of the steps of a preferred embodiment of the present invention.

[0013] Figure 2 It is a structural schematic diagram of a preferred embodiment of the present invention.

[0014] Figure 3 The figure is a reaction flow chart of a preferred embodiment of the present invention.

[0015] Figure 4 The figure is a flow chart of another preferred embodiment of the present invention.

[0016] Figure 5 It is a structural schematic diagram of another preferred embodiment of the present invention.

[0017] Figure 6 This is a flow chart of steps of another preferred embodiment of the present invention.

[0018] Figure 7 It is a structural schematic diagram of another preferred embodiment of the present invention.

[0019] Reference numerals:

[0020] Ammonia wastewater storage tank...1

[0021] Ammonia nitrogen detection element...11

[0022] Dissolved oxygen detector...12

[0023] Aeration device...2

[0024] Aeration time control...21

[0025] Gas flow control parts...22

[0026] Gas flow meter...221

[0027] Circulation pump...23

[0028] Pressure pump...24

[0029] Spray gun...25

[0030] Blower...26

[0031] Diffuser...27

[0032] Diffuser...28

[0033] Oxygen transfer coefficient calculation device...3

[0034] Exhaust gas collection device...4

[0035] Floating roof air cover...4 1

[0036] Gas collector...42

[0037] Flow meter...43 DETAILED DESCRIPTION

[0038] In order to achieve the above-mentioned purpose and effect, the technical means and structures adopted by the present invention are described in detail with reference to the accompanying drawings for the features and functions of the preferred embodiments of the present invention so as to provide a complete understanding.

[0039] Please refer to Figures 1 to 3 As shown, it is a step flow chart to a reaction flow chart of a preferred embodiment of the present invention. It can be clearly seen from the figure that the present invention includes:

[0040] Ammonia wastewater storage tank 1, storing ammonia-containing wastewater;

[0041] an ammonia nitrogen detection element 11, for detecting the ammonia nitrogen content of the ammonia-containing wastewater;

[0042] At least one aeration device 2 is connected to the ammonia wastewater storage tank 1 to input oxygen-containing gas into the ammonia wastewater storage tank 1. The aeration device 2 is provided with an aeration time control element 21 for controlling the output time and a gas flow control element 22 for controlling the output per unit time; and

[0043] The oxygen transfer coefficient calculation device 3 is informationally connected to the aeration device 2 to calculate the relationship between the oxygen transfer coefficient of the aeration device 2 and the aeration flow rate, and then operate the aeration device 2 to maintain the ratio of the mass of ammonia nitrogen participating in the ammonia oxidation reaction to the mass of oxygen in the ammonia-containing wastewater at 1:1.5 to 1:2.

[0044] The aeration device 2 can be a combination of a circulation pump 23, a pressure pump 24 and a spray gun 25, or a combination of a blower, a diffuser pipe and a diffuser plate, and the calculation method step (B) of the oxygen transfer coefficient calculation device 3 can be divided into a clean water adsorption measurement method, a clean water desorption measurement method, and a mixed liquid tail gas measurement method, but the details of the specific operation are not limited. This embodiment takes the aeration device 2 composed of a circulation pump 23, a pressure pump 24 and a spray gun 25, and the oxygen transfer coefficient calculation device 3 using the clean water desorption measurement method as examples, so the ammonia-containing wastewater treatment method of the present invention mainly includes the following steps:

[0045] (A) installing an aeration device: connecting at least one aeration device 2 to the ammonia wastewater storage tank 1;

[0046] (B) Measurement steps:

[0047] (B1) Clean water measurement: adding clean water into the ammonia wastewater containing tank 1;

[0048] (B2) Increasing the dissolved oxygen content: increasing the dissolved oxygen content of the clean water, and using the dissolved oxygen detector 12 to detect the dissolved oxygen content to a high point (supersaturation);

[0049] (B3) inputting gas: inputting oxygen-containing gas into the clean water by using the aeration device 2;

[0050] (B4) Setting the output and recording of the aeration device: using the aeration time control component 21 and the gas flow control component 22 of the aeration device 2, setting the output time and the output per unit time of the aeration device 2, and recording the aeration amount of the aeration device 2;

[0051] (B5) Monitoring dissolved oxygen until saturation: The dissolved oxygen detector 12 monitors the dissolved oxygen content of the ammonia-containing wastewater until saturation;

[0052] (B6) Calculating the relationship between the oxygen transfer coefficient and the aeration flow rate: Based on the output time, the output per unit time, and the aeration volume, the oxygen transfer coefficient calculation device 3 calculates the relationship between the oxygen transfer coefficient and the aeration flow rate of the aeration device 2.

[0053] (C) Detecting ammonia nitrogen content: using at least one ammonia nitrogen detection element 11 disposed in the ammonia wastewater storage tank 1 to detect the ammonia nitrogen content of the ammonia-containing wastewater;

[0054] (D) Controlling the mass ratio of ammonia nitrogen to oxygen: Operate the aeration device 2 to maintain the mass ratio of ammonia nitrogen participating in the ammonia oxidation reaction in the ammonia-containing wastewater to oxygen at 1:1.5 to 1:2, thereby controlling the mass ratio of ammonia nitrogen (NH4 + ) is oxidized to nitrate (NO3 - ) before being oxidized to nitrite (NO2 - ), the remaining mass of ammonia nitrogen directly enters the anaerobic ammonium oxidation reaction.

[0055] Through the above description, the structure of the present technology has been understood. According to the corresponding coordination of this structure, the advantage of the ammonia oxidation reaction entering the anaerobic ammonia oxidation reaction can be more accurately controlled. It can be clearly seen from the figure that the treatment method of the present invention is not limited by the concentration problem. Therefore, it can be applied to wastewater containing tanks such as low concentration (cultivation pond) or high concentration (wastewater plant). When used, an ammonia nitrogen detection element 11 must be set in the ammonia wastewater containing tank 1. The ammonia nitrogen detection element 11 uses the quantitative ammonia-containing wastewater in the ammonia wastewater containing tank 1 before the aeration device 2 removes ammonia to calculate the ammonia nitrogen content, for example, 100m 3 100mgN / L NH4 was measured in the ammonia-containing wastewater + , which means that the mass of ammonia nitrogen is 10 kg. However, the operation order of step (C) and step (B) is not important, and the purpose is only to obtain the mass of ammonia nitrogen and the mass of oxygen respectively. The present invention still implements step (B) first.

[0056] In order to calculate the relationship between the oxygen transfer coefficient of the aeration device 2 and the aeration flow rate, the oxygen transfer coefficient of the aeration device 2 must first be determined, and then the relationship between the oxygen transfer coefficient and the aeration flow rate can be obtained. The oxygen transfer coefficient is also called the volume dissolved oxygen coefficient (K L a) is the liquid film mass transfer coefficient K LThe product of the gas-liquid specific surface area a of the foam is difficult to measure. Therefore, the present invention utilizes the time required for the dissolved oxygen content per unit volume to change from 0 to saturation or from supersaturation to saturation, combined with the aeration volume output by the aeration device 2 during this time, to obtain the relationship between the oxygen transfer coefficient of the aeration device 2 and the aeration flow rate in disguised form. This embodiment takes the clean water desorption measurement method as an example. The clean water desorption measurement method can more accurately obtain the relationship between the oxygen transfer coefficient of the aeration device 2 and the aeration flow rate, but a large amount of clean water must be injected first. Therefore, as in steps (B1-B2), clean water must be added to the ammonia wastewater holding tank 1 first, and the dissolved oxygen content of the clean water is increased to a high point (supersaturation). In actual operation, hydrogen peroxide (H2O2) can be added to the clean water to quickly increase the dissolved oxygen content of the clean water. When the dissolved oxygen detector 12 reaches supersaturation, step (B3) is entered.

[0057] For example, in step (B3-B6), the circulating pump 23 and the spray gun 25 of the aeration device 2 are used to pump water into the clean water, and the pressure pump 24 is used to pump oxygen-containing gas (such as air) into the clean water, so that the oxygen-containing gas is mixed with the clean water in the spray gun 25 and then input into the ammonia wastewater storage tank 1, and the gas flow control part 22 is used to set the output per unit time of the aeration device 2, wherein the gas flow control part 22 is exemplified by a flow solenoid valve provided on the pipeline connecting the pressure pump 24 to the spray gun 25, and calculates and records the aeration amount of the aeration device 2. Then, the dissolved oxygen detector 12 is used to monitor the dissolved oxygen content of the clean water until it is saturated, and the oxygen transfer coefficient calculation device 3 can be used to calculate the relationship between the oxygen transfer coefficient of the aeration device 2 and the aeration flow rate. In this embodiment, the oxygen transfer coefficient calculation device 3 is exemplified by a computer.

[0058] Next, the aeration time control component 21 is used to set the output time of the aeration device 2. The aeration time control component 21 of this embodiment is taken as an example of a timer arranged on one side of the gas flow control component 22. By means of the formula (output time x output per unit time = aeration volume), the value of the actual oxygen mass in the oxygen-containing gas input by the aeration device 2 can be accurately controlled. Combined with the known ammonia nitrogen mass of the ammonia-containing wastewater in the ammonia wastewater containing tank 1, the aeration device 2 can be operated to maintain the ratio of the ammonia nitrogen mass participating in the ammonia oxidation reaction in the ammonia-containing wastewater to the oxygen mass at 1:1.5 to 1:2, thereby making the ammonia nitrogen (NH4 + ) is oxidized to nitrate (NO3 - ) before being oxidized to nitrite (NO2 - ) for direct entry into the anaerobic ammonium oxidation reaction. If the ammonia nitrogen mass and oxygen mass are first taken as molar mass-kilomole (kmol) as an example, and the relationship between the calculated aeration flow rate and the oxygen transfer coefficient is assumed to be 10m 3 / min, the aeration time control element 21 can be controlled to open for 45 to 60 seconds to output 7.5 to 10 kmol of oxygen, so that the ratio of the mass of ammonia nitrogen participating in the ammonia oxidation reaction to the mass of oxygen is maintained at 1:1.5 to 1:2. This embodiment takes opening for 45 seconds (producing 7.5 kmol of oxygen) and controlling the ratio to 1:1.5 as an example. At this time, 10 kmol of ammonia nitrogen (NH4 + ) 5 kmol of ammonia nitrogen and 7.5 kmol of oxygen will undergo ammonia oxidation reaction: 5NH4 + +7.5O2→5NO2 - +5H2O+10H + This reaction produces 5 kmol of nitrite (NO2 - ) will then react with the remaining 5 kmol of ammonia nitrogen (NH4 + ) enters the anaerobic ammonium oxidation reaction: 5NH4 + +5NO2 - →5N2+10H2O, and all ammonia nitrogen is decomposed into nitrogen and water, and no nitrate (NO3 - ) is generated, and there is no excess nitrite (NO2 - ) residue, with high efficiency, high accuracy and non-toxic ammonia wastewater treatment results.

[0059] However, the ammonia oxidation reaction and the above-mentioned anaerobic ammonium oxidation reaction require the catalysis of microorganisms. Therefore, the above-mentioned reaction formula and molar mass data are ideal reference values ​​and the recording method of hydrocarbons is omitted. In other words, if the influence of microorganisms is included in the reaction formula, the actual mass should be used for calculation. For example, 1 kmol of oxygen (O2) should be converted to 31.998 kg, and the relationship between aeration flow rate and oxygen transfer coefficient should actually be 1m 3 / min and 4.1 / hr. In order to accurately control the aeration flow rate, the aeration time control unit 21 is required to control the single opening time range to 30 to 120 seconds and the closing cycle to 150 to 600 seconds. Therefore, the actual required output oxygen volume is set to 19 kg / d, so that the ratio of ammonia nitrogen mass to oxygen mass is controlled at 1:1.9. At this time, 10 kg of ammonia nitrogen (NH4 + -N) will have 5.7kg of ammonia nitrogen and 19kg of oxygen undergoing ammonia oxidation reaction: NH4 + +1.44O2+0.0496CO2→0.01C5H7NO2+0.99NO2 - +0.97H2O+1.99H + This reaction produces 5.7 kg of nitrite (NO2 - -N) will be combined with the remaining 4.3kg ammonia nitrogen (NH4 + ) enters the anaerobic ammonium oxidation reaction: NH4+ +1.32NO2 - +0.066HCO3 - +0.13H + →1.02N2+0.26NO3 – +0.066CH2O 0.5 N 0.15 +2.03H2O, and decompose all ammonia nitrogen into nitrogen and a small amount of nitrate, including CO2, C5H7NO2, HCO3 - With CH2O 0.5 N 0.15 The existence and slight changes in the molar number are the effects of microorganisms participating in the reaction. Of course, the small amount of nitrate ions will not promote nitrification reaction in principle, or the nitrate ions produced by the nitrification reaction have little effect on the microorganisms, and the above reaction formulas themselves are common technologies. The key to this case lies in the control of the ratio of the mass of ammonia nitrogen to the mass of oxygen. This simplification is made for the convenience of understanding.

[0060] Of course, if the user does not want to decompose all the ammonia nitrogen at once, he can also freely adjust the input oxygen mass. For example, if only 10kg of oxygen is input, then 10kg of ammonia nitrogen (NH4 + ) will have 3kg of ammonia nitrogen and 10kg of oxygen undergo ammonia oxidation reaction, and the reaction will produce 3kg of nitrite (NO2 - ) will be combined with the remaining 2.3kg of ammonia nitrogen (NH4 + ) enters the anaerobic ammonium oxidation reaction, and finally there is still 4.7kg of ammonia nitrogen (NH4 + ), the user can control the aeration device 2 according to the needs to adjust the specific input oxygen quality, so as to achieve free and accurate control of the anaerobic ammonium oxidation reaction. Furthermore, the ratio of the ammonia nitrogen quality to the oxygen quality is preferably 1:1.6 to 1:1.9, which can ensure the promotion of the ammonia oxidation reaction and also ensure that the excessive amount of oxygen will cause the ammonia nitrogen or nitrite to be oxidized into nitrate.

[0061] Please also refer to Figure 4 and Figure 5 As shown in the figure, it is a step flow chart and a structural schematic diagram of another preferred embodiment of the present invention. It can be clearly seen from the figure that the main difference between this embodiment and the above embodiment is that the aeration device 2 is changed to a combination of a blower 26, a diffuser pipe 27 and a diffuser plate 28, and the calculation method of the oxygen transfer coefficient calculation device 3 is changed to a clean water adsorption measurement method. As an example, the ammonia-containing wastewater treatment method of this embodiment mainly includes the following steps:

[0062] (A) installing an aeration device: connecting at least one aeration device 2 to the ammonia wastewater storage tank 1;

[0063] (B) Measurement steps:

[0064] (B1) Clean water measurement: adding clean water into the ammonia wastewater storage tank 1;

[0065] (B2) Reducing the dissolved oxygen content: reducing the dissolved oxygen content of the clean water, and using the dissolved oxygen detector 12 to detect the dissolved oxygen content to a low point;

[0066] (B3) inputting gas: inputting oxygen-containing gas into the clean water by using the aeration device 2;

[0067] (B4) Setting the output and recording of the aeration device: using the aeration time control component 21 and the gas flow control component 22 of the aeration device 2, setting the output time and the output per unit time of the aeration device 2, and recording the aeration amount of the aeration device 2. The aeration device 2 uses at least one gas flow meter 221 provided on one side of the aeration device 2 to record the aeration amount;

[0068] (B5) Monitoring dissolved oxygen until saturation: The dissolved oxygen detector 12 monitors the dissolved oxygen content of the ammonia-containing wastewater until saturation;

[0069] (B6) Calculating the relationship between the oxygen transfer coefficient and the aeration flow rate: Based on the output time, the output per unit time, and the aeration volume, the oxygen transfer coefficient calculation device 3 calculates the relationship between the oxygen transfer coefficient and the aeration flow rate of the aeration device 2.

[0070] (C) Detecting ammonia nitrogen content: using at least one ammonia nitrogen detection element 11 disposed in the ammonia wastewater storage tank 1 to detect the ammonia nitrogen content of the ammonia-containing wastewater;

[0071] (D) Controlling the mass ratio of ammonia nitrogen to oxygen: Operate the aeration device 2 to maintain the mass ratio of ammonia nitrogen participating in the ammonia oxidation reaction in the ammonia-containing wastewater to oxygen at 1:1.5 to 1:2, thereby controlling the mass ratio of ammonia nitrogen (NH4 + ) is oxidized to nitrate (NO3 - ) before being oxidized to nitrite (NO2 - ), the remaining mass of ammonia nitrogen directly enters the anaerobic ammonium oxidation reaction.

[0072] In step (A), the aeration device 2 is set to use a blower 26 to transmit the oxygen-containing gas along the diffuser pipe 27 to the diffuser plate 28 provided at the bottom of the ammonia wastewater storage tank 1, and the oxygen-containing gas is evenly pumped into the clean water through the diffuser plate 28. In addition, this embodiment takes the clean water adsorption measurement method as an example, so a large amount of clean water is also required to be injected first, and the dissolved oxygen content of the clean water is reduced to the lowest point in step (B2). In actual operation, dissolved NaSO3 can be added to consume oxygen, while preventing the drug from being in a clumping state to interfere with the measurement of the dissolved oxygen detector 12. Although the amount of the drug may be affected by the ambient temperature or the storage of the drug, as long as the NaSO3 is completely dissolved, a slight excess does not affect the measurement result of the dissolved oxygen detector 12. If the lowest point cannot be reduced, CoCl2 can be added to increase the speed of consuming dissolved oxygen. The clean water adsorption measurement method can avoid the input of a large amount of oxygen, and the cost is relatively low. By using the diffuser 28 to inject air, oxygen can be quickly dissolved in the water, which is more efficient for obtaining the relationship between the oxygen transfer coefficient and the aeration flow rate of the aeration device 2. In addition, in step (B4), the gas flow meter 221 is used to directly detect the air intake at the input end of the gas flow control component 22, thereby avoiding the use of output time and unit time output calculation. The remaining actions are the same as the above embodiment and will not be repeated.

[0073] Please also refer to Figure 6 and Figure 7 As shown in the figure, it is a step flow chart and a structural schematic diagram of another preferred embodiment of the present invention. It can be clearly seen from the figure that this embodiment is similar to the above embodiment, except that the calculation method of the oxygen transfer coefficient calculation device 3 is changed to the mixed liquid tail gas measurement method as an example. Therefore, the ammonia-containing wastewater treatment method of this embodiment mainly includes the following steps:

[0074] (A) installing an aeration device: connecting at least one aeration device 2 to the ammonia wastewater storage tank 1;

[0075] (B) Measurement steps:

[0076] (B1) Ammonia wastewater measurement: adding ammonia-containing wastewater into the ammonia wastewater containing tank 1;

[0077] (B2) Dissolved oxygen monitoring: using the dissolved oxygen detector 12 to monitor the dissolved oxygen content at the current temperature;

[0078] (B3) inputting gas: using the aeration device 2 to input oxygen-containing gas into the ammonia-containing wastewater;

[0079] (B4) Setting the output and recording of the aeration device: using the aeration time control component and the gas flow control component of the aeration device 2, setting the output time and the output per unit time of the aeration device 2, and recording the aeration amount of the aeration device 2;

[0080] (B5) Recording the tail gas flow rate: using the tail gas collection device 4 disposed on the surface of the ammonia wastewater storage tank 1, recording the tail gas flow rate of the tail gas collection device 4;

[0081] (B6) Calculating the relationship between the oxygen transfer coefficient and the aeration flow rate: According to the output time, the output per unit time, the aeration volume, and the tail gas flow rate, the oxygen transfer coefficient calculation device 3 calculates the relationship between the oxygen transfer coefficient and the aeration flow rate of the aeration device 2;

[0082] (C) Detecting ammonia nitrogen content: using at least one ammonia nitrogen detection element 11 disposed in the ammonia wastewater storage tank 1 to detect the ammonia nitrogen content of the ammonia-containing wastewater;

[0083] (D) Controlling the mass ratio of ammonia nitrogen to oxygen: Operate the aeration device 2 to maintain the mass ratio of ammonia nitrogen participating in the ammonia oxidation reaction in the ammonia-containing wastewater to oxygen at 1:1.5 to 1:2, thereby controlling the mass ratio of ammonia nitrogen (NH4 + ) is oxidized to nitrate (NO3 - ) before being oxidized to nitrite (NO2 - ), the remaining mass of ammonia nitrogen directly enters the anaerobic ammonium oxidation reaction.

[0084] The mixed liquid tail gas measurement method is used in the case where the site does not allow the injection of clean water into the ammonia wastewater storage tank 1, for example, there is already ammonia wastewater in the ammonia wastewater storage tank 1, and the tail gas collection device 4 includes a floating top gas hood 41 and a gas collecting pipe 42. The floating top gas hood 41 covers a large area on the water surface of the ammonia wastewater in a suspended manner, and the side part of the floating top gas hood 41 is immersed under the water surface. The side part on the water surface forms an airtight space with the top surface, and the top surface is connected to the gas collecting pipe 42. The gas collecting pipe 42 is also provided with a flow meter 43. When the aeration device 2 inputs gas into the ammonia wastewater, in addition to using the gas flow meter 221 to record the aeration volume, the flow meter 43 on the gas collecting pipe 42 is also used to record the tail gas flow collected in the floating top gas hood 41. Then, by calculating the difference between the aeration volume and the tail gas flow rate, the relationship between the oxygen transfer coefficient and the aeration flow rate of the aeration device 2 can be obtained. The remaining actions are the same as those in the above embodiment and will not be repeated.

[0085] However, the above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Therefore, all simple modifications and equivalent structural changes made by using the contents of the present invention and the drawings as examples should be included in the patent scope of the present invention and are hereby declared.

Claims

1. A method for treating ammonia-containing wastewater, characterized in that: The main steps include: (A) connecting at least one aeration device to an ammonia wastewater storage tank; (B) calculating the relationship between the oxygen transfer coefficient and the aeration flow rate of the aeration device using an oxygen transfer coefficient calculation device; (C) using at least one ammonia nitrogen detection element disposed in the ammonia wastewater containing tank to detect the ammonia nitrogen quality of the ammonia-containing wastewater; and (D) operating the aeration device to maintain the ratio of the mass of ammonia nitrogen participating in the ammonia oxidation reaction in the ammonia-containing wastewater to the mass of oxygen at 1:1.5 to 1:2, thereby maintaining the ammonia nitrogen (NH4 + ) is oxidized to nitrate (NO3 - ) before being oxidized to nitrite (NO2 - ), the remaining mass of ammonia nitrogen directly enters the anaerobic ammonium oxidation reaction.

2. The method for treating ammonia-containing wastewater according to claim 1, wherein: The ratio of the mass of ammonia nitrogen to the mass of oxygen is 1:1.6 to 1:1.

9.

3. The method for treating ammonia-containing wastewater according to claim 1, characterized in that: Step (B) comprises: Step (B1) adding clean water into the ammonia wastewater holding tank; Step (B2) reduces the dissolved oxygen content of the clean water and uses a dissolved oxygen detector to detect the dissolved oxygen content to a low point; Step (B3) using the aeration device to input oxygen-containing gas into the clean water; Step (B4) using the aeration time control component and the gas flow control component of the aeration device to set the output time and the output per unit time of the aeration device, and record the aeration amount of the aeration device; Step (B5) monitoring the dissolved oxygen content of the ammonia-containing wastewater by the dissolved oxygen detector until saturation; and Step (B6) calculates the relationship between the oxygen transfer coefficient of the aeration device and the aeration flow rate based on the output time, the output per unit time, and the aeration volume by an oxygen transfer coefficient calculation device.

4. The method for treating ammonia-containing wastewater according to claim 1, characterized in that: Step (B) comprises: Step (B1) adding clean water into the ammonia wastewater holding tank; Step (B2) increases the dissolved oxygen content of the clean water and uses a dissolved oxygen detector to detect that the dissolved oxygen content reaches a high point (supersaturation); Step (B3) using the aeration device to input oxygen-containing gas into the clean water; Step (B4) using the aeration time control component and the gas flow control component of the aeration device to set the output time and the output per unit time of the aeration device, and record the aeration amount of the aeration device; Step (B5) monitoring the dissolved oxygen content of the ammonia-containing wastewater by the dissolved oxygen detector until saturation; and Step (B6) calculates the relationship between the oxygen transfer coefficient of the aeration device and the aeration flow rate based on the output time, the output per unit time, and the aeration volume by an oxygen transfer coefficient calculation device.

5. The method for treating ammonia-containing wastewater according to claim 1, characterized in that: Step (B) comprises: Step (B1) adding ammonia-containing wastewater into the ammonia wastewater holding tank; Step (B2) monitors the dissolved oxygen concentration at the current temperature using a dissolved oxygen detector; Step (B3) using the aeration device to input oxygen-containing gas into the ammonia-containing wastewater; Step (B4) using the aeration time control component and the gas flow control component of the aeration device to set the output time and the output per unit time of the aeration device, and record the aeration amount of the aeration device; Step (B5) utilizes a tail gas collection device disposed on the surface of the ammonia wastewater storage tank to record the tail gas flow rate of the tail gas collection device; and Step (B6) calculates the relationship between the oxygen transfer coefficient of the aeration device and the aeration flow rate based on the output time, the output per unit time, the aeration volume, and the tail gas flow rate by an oxygen transfer coefficient calculation device.

6. The method for treating ammonia-containing wastewater according to any one of claims 3 to 5, characterized in that: The aeration device uses at least one gas flow meter arranged on one side of the aeration device to record the aeration amount.

7. An ammonia-containing wastewater treatment device, characterized in that: Mainly include: Ammonia wastewater storage tank, storing ammonia-containing wastewater; At least one ammonia nitrogen detection element for detecting the ammonia nitrogen content of the ammonia-containing wastewater; at least one aeration device connected to the ammonia wastewater storage tank to input oxygen-containing gas into the ammonia wastewater storage tank, the aeration device being provided with an aeration time control element for controlling the output time and a gas flow control element for controlling the output per unit time; and The oxygen transfer coefficient calculation device is information-linked to the aeration device to calculate the relationship between the oxygen transfer coefficient of the aeration device and the aeration flow rate, and then operate the aeration device to maintain the ratio of the mass of ammonia nitrogen participating in the ammonia oxidation reaction to the mass of oxygen in the ammonia-containing wastewater at 1:1.5 to 1:

2.

8. The ammonia-containing wastewater treatment device according to claim 7, characterized in that: The ratio of the mass of ammonia nitrogen to the mass of oxygen is 1:1.6 to 1:1.

9.

9. The ammonia-containing wastewater treatment device according to claim 7, characterized in that: The ammonia wastewater containing tank is provided with a dissolved oxygen detector to record the dissolved oxygen content variation curve of the ammonia wastewater.

10. The ammonia-containing wastewater treatment device according to claim 7, characterized in that: A tail gas collecting device is provided on the surface of the ammonia wastewater containing tank to record the tail gas flow rate that emerges from the water surface during the aeration process of the aeration device.

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