Ammonia nitrogen detection equipment and water quality detection method

Abstract

The invention relates to ammonia nitrogen detection equipment and a water quality detection method. The detection equipment comprises an ammonia gas detection unit and an ammonia gas generation unit, the ammonia gas generation unit comprises an electrolysis electrode, the electrolysis electrode electrolyzes a to-be-detected water body entering the ammonia gas generation unit under the condition of electrification to generate OH <->, NH4 < + > in the to-be-detected water body is converted into ammonia gas under the action of OH <->, and the ammonia gas enters the ammonia gas detection unit.

Description

[0001] This application is a divisional application of the Chinese patent application with application number CN 202010962288.6, application date September 14, 2020, and name “Ammonia Nitrogen Detection Equipment and Water Quality Detection Method”. Technical Field

[0002] The present invention belongs to the field of environmental protection, and specifically, relates to the field of water quality monitoring of water bodies, especially river water, lake water and the like. Background Art

[0003] With the increasing awareness of environmental protection, new requirements and challenges are increasingly being raised for water quality monitoring of various natural water bodies, domestic or industrial wastewater, and secondary purified water.

[0004] Whether it is a natural water body, such as a river or lake, or secondary purified water obtained after wastewater treatment, the control and detection of the nitrogen content therein is one of the focuses of various environmental protection process research or treatment. In actual detection or monitoring methods, the existing method is usually based on field sampling, and then the content of various target elements or substances in the water body is determined by the laboratory. Therefore, a large amount of manpower and material resources are required. In addition, although the accuracy of the test results can usually be guaranteed and the reliability is strong, the effectiveness of the detection or monitoring is generally poor, which also reduces the significance of the detection to a certain extent. For example, it usually takes several days or even more than a week from sampling to the test results. In addition, due to the limited scale of field sampling, it is difficult to carry out large-scale and large-area water quality monitoring in a short time.

[0005] Furthermore, various detection methods based on unmanned detection or IoT have emerged. For example:

[0006] Reference 1 provides a system and method for automatic monitoring of river water quality, which system includes a river monitoring platform and automatic river monitoring equipment deployed in the monitoring area, wherein the automatic river monitoring equipment includes a solar monitoring station and an unmanned monitoring ship. The river monitoring platform is used for comprehensive management of the automatic river monitoring equipment, monitoring task management, and monitoring data management. The solar monitoring station is used for water quality monitoring at fixed points and for mooring and charging of unmanned monitoring ships. The unmanned monitoring ship is used for automatic monitoring of the river water quality, three-dimensional structure of the river, and ground conditions in the monitoring area.

[0007] Reference 2 provides a water quality monitoring system and a water quality monitoring method based on the Internet of Things. The system includes multiple water quality monitors and base stations. The water quality monitors report energy packets to the base stations. The base stations extract the water quality monitor number, remaining energy, energy usage rate and timestamp from the energy packet, and use the water quality monitor remaining usage time generation model, the water quality monitor number, remaining energy, energy usage rate and timestamp to generate the current remaining usage time of the water quality monitor. If the current remaining usage time is less than a preset threshold, the water quality monitor is identified as a water quality monitor with no power, a location coordinate acquisition request is sent to the water quality monitor with no power, the returned location coordinates are received, and a notification message is sent to a preset terminal, the notification message including the location coordinates and the water quality monitor number, so that the preset terminal receives and displays the notification message.

[0008] In the above-mentioned detection or monitoring equipment or methods, the detection of nitrogen content in water is usually carried out using an "ammonia nitrogen probe".

[0009] The working principle of existing online ammonia nitrogen probes is mainly based on the following two typical detection methods:

[0010] The first method is mainly based on spectrophotometry, for example, based on the national standard (HJ536-2009) ammonia nitrogen detection method. After mixing the sample to be analyzed with the reaction reagent, the NH4 + The ions are converted into ammonia (NH3), which is released from the sample being analyzed. The ammonia is then transferred to a measuring cell containing an indicator and redissolved in the indicator. These reactions will cause the color of the solution to change, which the ammonia nitrogen detector measures using colorimetry, and then calculates and obtains the ammonia nitrogen concentration value.

[0011] The second method is the ammonia sensitive electrode method, which also adds certain reagents to NH4 + The ions are converted into ammonia (NH3). The free NH3 passes through a semipermeable membrane and enters the interior of the ion electrode, where it participates in chemical reactions and changes the pH value of the electrolyte inside the electrode. The change in pH is linearly related to the concentration of NH3, which is sensed by the electrode and converted into ammonia nitrogen concentration.

[0012] Both of the above methods are similar to shore station testing methods. During testing, a considerable amount of reagents or indicators need to be added to meet the test light path, color development and other requirements. Taking the more common Hach Amtax Compact II ammonia nitrogen detector on the market as an example, the monthly consumption of reagents is about 1L. At the same time, the entry and exit of reagents and water samples need to be carried out through mechanical devices such as pumps and valves, which are relatively large in size and the test process is relatively complicated.

[0013] Therefore, although various automated monitoring or online detection methods based on ammonia nitrogen probes have been tried to a certain extent, such online detection equipment generally requires the addition of a considerable amount of strong alkaline reagents to adjust the pH environment, the reagent consumption is relatively large, and the addition method is complicated. Therefore, it is still not enough to improve the efficiency and convenience of online detection capabilities.

[0014] References:

[0015] Reference 1: CN110456013A

[0016] Reference 2: CN108490045A Summary of the invention

[0017] Problem that the invention aims to solve

[0018] Based on the many shortcomings of the existing methods for online or automatic detection of nitrogen content in water, the present invention provides an improved device and method for online or automatic detection of nitrogen in water based on an ammonia nitrogen probe.

[0019] In the detection device of the present invention, an ammonia generating unit including an electrolytic electrode is introduced into the ammonia nitrogen probe, so that water quality monitoring of the water body can be stably realized for a long time without adding an alkaline reagent. In addition, since no alkaline reagent is needed, the overall size of the ammonia nitrogen probe device can be significantly reduced, which is more conducive to large-scale deployment in water bodies. Therefore, compared with previous detection or monitoring equipment, it has a significantly increased data collection scale and significantly improves the adaptability, effectiveness and reliability of the detection or monitoring method.

[0020] Solutions for solving problems

[0021] After long-term and intensive research, the inventor found that the above technical problems can be solved by implementing the following method:

[0022] [1]. The present invention first provides an ammonia nitrogen detection device, which includes:

[0023] Ammonia detection unit;

[0024] Ammonia generating unit;

[0025] The ammonia generating unit includes an electrolytic electrode, and the electrolytic electrode electrolyzes the water to be tested entering the ammonia generating unit under the condition of passing current to generate OH - ,

[0026] In the OH - Under the action of + It is converted into ammonia and enters the ammonia detection unit.

[0027] [2] According to the device described in [1], there is a semipermeable membrane between the ammonia generating unit and the ammonia detecting unit, and the semipermeable membrane does not allow liquid molecules to pass through.

[0028] [3]. In the device according to [1] or [2], the ammonia generating unit comprises one or more electrolysis electrodes.

[0029] [4] According to the device described in any one of [1] to [3], the water body to be tested in the ammonia generating unit is selected from river water, lake water, sea water, domestic or industrial wastewater, or a water body selected from purified domestic or industrial wastewater.

[0030] [5]. According to the device described in any one of [1] to [4], the ammonia generating unit includes a pre-electrolysis unit, and at least one of the electrolysis electrodes is placed in the ammonia generating unit at least in the pre-electrolysis unit.

[0031] [6] According to the device described in any one of [1] to [5], the ammonia generating unit also includes a counter electrode, which electrolyzes the water to be tested entering the ammonia generating unit under the condition of passing current to generate H + .

[0032] [7]. In the device according to any one of [1] to [6], the ammonia gas detection unit comprises an ammonia nitrogen detection component, the ammonia nitrogen detection component comprises a reaction chamber and a liquid storage chamber, and the volume of the liquid storage chamber is greater than the volume of the reaction chamber.

[0033] [8] In the device according to [7], the reaction chamber includes a conductivity-responsive electrode.

[0034] [9] According to any one of [1] to [7], the ammonia detection unit calculates the NH4 in the water to be detected based on the change of optical or chemical parameters. + concentration.

[0035]

[10] . According to any one of [1] to [9], the ammonia nitrogen detection device further includes a temperature compensation unit.

[0036]

[11] . In the device according to any one of [1] to

[10] , the current is direct current.

[0037]

[12] . Furthermore, the present invention provides a device for detecting water quality, which includes one or more devices according to any one of [1] to

[11] .

[0038]

[13] . In addition, the present invention also provides a method for online detection of river water quality, the method comprising using the device according to any one of [1] to

[12] to detect NH4 + concentration.

[0039]

[14] The method according to

[13] , wherein two or more devices according to any one of [1] to

[12] are used per square kilometer of water surface area.

[0040] Effects of the Invention

[0041] By using the above technical solution, the present invention can achieve the following technical effects:

[0042] (1) The present invention adds an electrolytic electrode to the ammonia nitrogen detection device, so that the pH value of the water body to be tested can be increased by electrolyzing the water body to be tested, thereby converting the ammonium ions present therein into ammonia gas. Compared with traditional equipment, there is no need to add additional (strong) alkaline reagents.

[0043] (2) Since there is no need to add additional alkaline reagents, it brings convenience to the detection method and equipment maintenance, greatly improving the efficiency of water quality detection.

[0044] (3) Since there is no need to add additional alkaline reagents, there is no need for containers and control devices for holding alkaline reagents in traditional equipment, which saves the volume of ammonia nitrogen detection equipment and facilitates large-scale preparation and layout. This not only significantly improves data collection efficiency, but also does not increase maintenance costs.

[0045] (4) Since there is no need to add additional alkaline reagents, the detection cycle can be greatly improved. In addition, due to the convenience in maintenance, the detection equipment of the present invention can also be used on a large scale to detect water quality in complex places or water bodies with difficult geographical conditions where previous detection equipment was difficult to apply, thereby greatly improving the environmental applicability of the detection equipment.

[0046] In summary, the detection equipment provided by the technical solution of the present invention can more conveniently carry out efficient large-scale detection of water bodies to be tested under various conditions, and has excellent detection accuracy and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 : Schematic diagram of an ammonia nitrogen detection device in one embodiment of the present invention

[0048] Figure 2 : Schematic diagram of an ammonia nitrogen detection device in one embodiment of the present invention

[0049] Figure 3:Characterization of the test results in one embodiment of the present invention

[0050] Figure 4a-4c :An exemplary structure of the ammonia nitrogen detection component in the ammonia detection unit of the present invention

[0051] Figure 5a-Figure 5b :An exemplary structure of the ammonia nitrogen detection component in the ammonia detection unit of the present invention

[0052] 1, 1': Ammonia sensitive materials

[0053] 2, 2': Electrolysis electrode (cathode)

[0054] 3, 3': Electrolysis counter electrode (anode)

[0055] 4, 4': Semipermeable membrane

[0056] 5: Air guide valve

[0057] 6: Reaction chamber

[0058] 7: Liquid storage chamber

[0059] 8: Conductivity detection electrode

[0060] 9: Cut-off

[0061] 10: Connectivity

[0062] 11: Electrical connection channel

[0063] 12: Functional cavity

[0064] 111: Wires DETAILED DESCRIPTION

[0065] The following is a detailed description of the present invention. The following description of the technical features is based on representative embodiments and specific examples of the present invention, but the present invention is not limited to these embodiments and specific examples. It should be noted that:

[0066] In this specification, the numerical range expressed using "a numerical value A to a numerical value B" means a range including the endpoints numerical values ​​A and B.

[0067] In the present specification, a numerical range expressed using "above" or "below" means a numerical range including the number.

[0068] In this specification, the word "may" means both performing a certain process and not performing a certain process.

[0069] In this specification, the use of "optional" or "optional" indicates that certain substances, components, execution steps, application conditions and other factors are used or not used.

[0070] In this manual, unless otherwise specified, the "normal temperature" used generally refers to the normal temperature of the water body to be tested, that is, the temperature is between 5°C and 25°C.

[0071] In this specification, the unit names used are all international standard unit names, and unless otherwise stated, the "%" used indicates weight or mass percentage.

[0072] In this specification, the references to "some specific / preferred embodiments", "other specific / preferred embodiments", "embodiments", etc., mean that the specific elements (e.g., features, structures, properties and / or characteristics) described in connection with the embodiments are included in at least one embodiment described herein, and may or may not exist in other embodiments. In addition, it should be understood that the elements may be combined in various embodiments in any suitable manner.

[0073] <First aspect>

[0074] In a first aspect of the present invention, an ammonia nitrogen detection device is provided, which at least includes an ammonia detection unit and an ammonia generation unit.

[0075] Ammonia detection unit

[0076] In the present invention, the ammonia detection unit detects the amount of ammonia by producing a physical or chemical reaction after the ammonia sensitive material contacts the ammonia. In the present invention, the ammonia detection unit includes an ammonia nitrogen detection component, Figure 1 The dotted line shows the basic structure of the ammonia nitrogen detection component in one case of the present invention, including an ammonia sensitive material and a gas guide valve. In addition, the semipermeable membrane can preferably be included in the ammonia detection unit as a part of the ammonia detection unit, but it should be appreciated that such a situation is not necessary, that is, in any other necessary situation, the semipermeable membrane may not be included in the above-mentioned ammonia detection unit.

[0077] In some specific embodiments of the present invention, the ammonia sensitive material may be selected from those materials that produce optical changes, such as color changes, after contacting ammonia. Such materials may produce different color changes or reflective light of different properties according to the amount of ammonia contacted after contacting ammonia. The color or reflected light is detected by additional optical detection equipment, and the amount of ammonia absorbed by the ammonia sensitive material is determined by comparison with a standard sample.

[0078] There is no particular restriction on the type or morphology of such ammonia sensitive materials, and they can be selected from the art as needed. Such ammonia sensitive materials ultimately convert color changes or optical signals into data information based on colorimetry or optical chromatography to present the test results. Advantageously, these materials have time-dependent instability (recoverability) in adsorption to ammonia under certain conditions, so that the adsorbed ammonia is desorbed from the surface of the ammonia sensitive material under external influences.

[0079] In some other specific embodiments of the present invention, for ammonia sensitive materials, materials that undergo chemical changes, such as pH changes, after contact with ammonia can be selected. In some preferred embodiments of the present invention, the change in pH value of these materials shows a linear change trend with the increase in the amount of ammonia. In such specific embodiments, these ammonia sensitive materials include acidic materials, and the acidic materials include acidic substances with a pH value lower than 7, preferably lower than 6, and further preferably lower than 5. There is no particular limitation on the form of the acidic material, which can be liquid or semi-solid at room temperature. In some preferred embodiments, the acidic material can include one or more protonic acids, and more specifically can include a mixture of one or more of boric acid, sulfuric acid, and hydrochloric acid.

[0080] During the detection, the pH value of the ammonia sensitive material that has absorbed ammonia or its changes is detected to obtain the amount of ammonia absorbed by the ammonia sensitive material. Similarly, in a further preferred embodiment of the present invention, for such an ammonia sensitive material, its combination with ammonia has time-dependent instability (recoverability), that is, under the action of external conditions (such as light, heat, etc.), the absorbed ammonia can be removed, thereby achieving self-renewal of the material for the next detection.

[0081] In some other embodiments of the present invention, ammonia sensitive materials may be materials or reagents whose electrical properties change after absorbing ammonia. Such materials or reagents, for example, may have an initial conductivity. After absorbing ammonia, the change (rate) of the conductivity shows a characteristic of changing linearly with the amount of ammonia absorbed.

[0082] In addition, the ammonia sensitive materials may also be those that selectively adsorb ammonia and have a change in electrical signals after adsorption. Typically, they may be selected from composite materials of polymers and metal oxides, and similarly, it is advantageous for such materials to have a shorter recovery time.

[0083] In addition, although in theory ammonia sensitive materials also include any material that can be analyzed by liquid chromatography or gas chromatography after absorbing ammonia, in practical applications, although the detection accuracy can be guaranteed, their device design is complex and the cost is high. Therefore, the present invention preferably does not use these ammonia absorption materials based on liquid or gas chromatography unless absolutely necessary.

[0084] In some specific embodiments, the ammonia detection unit of the present invention is separated from the ammonia generation unit described below by a semipermeable membrane.

[0085] In principle, there is no particular limitation on the semipermeable membrane, which allows gas to pass through but stops liquid molecules from passing through. In some preferred embodiments of the present invention, the semipermeable membrane can be prepared from natural polymer material membranes, synthetic polymer material membranes, ceramic materials or foam materials. Without limitation, according to actual needs, these semipermeable membranes can be single-layer or multi-layer composite membrane layers, provided that these materials are chemically and physically inert to ammonia.

[0086] In addition to the above-mentioned ammonia sensitive material and semipermeable membrane, in some specific embodiments of the present invention, the ammonia detection unit also includes gas inlet and gas outlet channels. Usually, the gas inlet channel can be arranged between the semipermeable membrane and the above-mentioned ammonia sensitive material. In some specific embodiments, such a gas inlet channel and a gas outlet channel can be controlled by an auxiliary control component to achieve switch closure. For example, when the detection is started, the gas inlet channel is in an open state and the gas outlet channel is in a closed state, and when the detection is completed or the detection device is in a dormant state, the gas inlet channel is in a closed state, and the gas outlet channel can be in an open or closed state as needed. In addition, for the gas outlet channel, it is arranged in a manner that is conducive to the release of ammonia adsorbed by the ammonia sensitive material, so as to facilitate the desorption and release of ammonia and the recovery or regeneration of ammonia sensitive materials after detection.

[0087] The following is an illustrative description of the ammonia nitrogen detection component in the ammonia gas detection unit used in some specific embodiments of the present invention.

[0088] like Figures 4a to 5b The figure shows an available ammonia nitrogen detection component structure in the present invention, which can be used to detect the ammonia nitrogen content in the water body to be tested.

[0089] The ammonia nitrogen detection component includes a reaction chamber 6 and a liquid storage chamber 7, and liquid ammonia sensitive materials can be placed in the reaction chamber 6 and the liquid storage chamber 7. During detection, the ammonia nitrogen content in the water body to be detected is detected by detecting the change (rate) of the conductivity or pH value of the ammonia sensitive material.

[0090] The reaction chamber 6 is used to accommodate a reaction reagent (e.g., the boric acid solution as an ammonia sensitive material described above) and receive ammonia in the sample to be tested. The volume of the liquid storage chamber 7 is greater than the volume of the reaction chamber 6 and is used to store the reaction reagent. In some specific embodiments, the volume of the liquid storage chamber 7 is more than 50 times the volume of the reaction chamber 6, preferably more than 200 times, more preferably more than 1000 times, more preferably more than 2500 times. For example, the volume of the reaction chamber 6 is 0.1ml to 2ml, preferably 0.1ml to 0.5ml, more preferably 0.1ml to 0.2ml, and the volume of the liquid storage chamber 7 is 50ml to 500ml.

[0091] The ammonia nitrogen detection component also includes a conductivity responsive electrode 8 (also referred to herein as a conductivity detection electrode 8). In some specific embodiments, the detection end of the electrode 8 is located in the reaction chamber 6 to detect parameters of the reaction reagents such as pH value and conductivity.

[0092] In addition, from the following aspects, in a preferred embodiment of the present invention, the ammonia nitrogen detection component detects by using a conductivity-responsive electrode through a change (rate) of conductivity:

[0093] First, conductivity detection is more sensitive;

[0094] Second, the measurement results are more accurate (comparatively, when testing pH values, the reading can only be read to two decimal places);

[0095] Third, the probe used to detect conductivity has a longer life.

[0096] The liquid storage chamber 7 and the reaction chamber 6 can be connected or isolated in a controlled and automatic manner.

[0097] When the reaction reagent in the reaction chamber 6 reacts to a predetermined degree, for example, when the liquid ammonia sensitive material in the reaction chamber 6 reacts to saturation with ammonia, the parameter detected by the ammonia nitrogen detection component will no longer accurately reflect the ammonia nitrogen concentration in the sample to be tested. In a possible working mode, the ammonia nitrogen detection component detects the ammonia nitrogen concentration of surface water and works once every 10 minutes. After 1 to 2 days of work, the reaction reagent in the reaction chamber 6 is saturated with ammonia and the signal reaches the maximum value.

[0098] At this time, the liquid storage chamber 7 is connected to the reaction chamber 6, and the liquid storage chamber 7 automatically replenishes the stored reaction reagent to the reaction chamber 6, and the fresh ammonia sensitive material (for example, boric acid solution, etc.) in the liquid storage chamber 7 is exchanged to the reaction chamber 6 by means such as solution diffusion. When the reaction reagent in the reaction chamber 6 is replenished, the reaction chamber 6 and the liquid storage chamber 7 are isolated again, and the ammonia nitrogen detection component continues to start a new cycle of work.

[0099] The predetermined degree can be determined, for example, by judging time, conductivity, etc. Specifically, for example, during the detection process, ammonia gas continuously enters the reaction chamber 6, which gradually increases the absolute value of the conductivity inside the reaction chamber 6. Finally, when the maximum range or predetermined value of the conductivity is reached, it is determined that the reaction reagent has reacted to the predetermined degree. For another example, the time is calculated based on the test frequency and the average amount of reagent required for the test, and the time is set as the time to replenish the stored reaction reagent to the reaction chamber 6.

[0100] It should be understood that when the reaction reagent in the liquid storage chamber 7 diffuses into the reaction chamber 6, the concentration of the reaction reagent in the liquid storage chamber 7 gradually decreases, and the concentration of the reaction reagent in the reaction chamber 6 gradually increases. As long as the reaction chamber 6 is replenished with fresh reaction reagent, the reaction between the reaction reagent and ammonia can be achieved regardless of the concentration of the ammonia sensitive material (boric acid solution) in the reaction chamber 6.

[0101] Therefore, the ammonia nitrogen detection component has its own "reaction reagent" library. When the reaction reagent in the reaction chamber 6 is consumed and the ammonia nitrogen detection component no longer has detection capability or the detection sensitivity decreases, the reaction reagents in the two chambers have a concentration difference so that the reaction reagents in the liquid storage chamber 7 naturally diffuse into the reaction chamber 6, and the liquid storage chamber 7 automatically replenishes the reaction reagents to the reaction chamber 6, which promptly restores the detection capability of the ammonia nitrogen detection component or improves the detection sensitivity, thereby extending the service life of the ammonia nitrogen detection component with a single addition of reagents.

[0102] Taking the ammonia nitrogen detection component having the reaction chamber 6 and the liquid storage chamber 7 of the above-mentioned size as an example, after each addition of reagents to the liquid storage chamber 7, the service life of the ammonia nitrogen detection component can be as long as 1 to 2 years.

[0103] like Figure 4a and Figure 4b As shown, in one embodiment of the ammonia nitrogen detection component in the ammonia detection unit provided in the present disclosure, the liquid storage chamber 7 can be located above the reaction chamber 6, and there can be a connecting passage 10 between the liquid storage chamber 7 and the reaction chamber 6 that can be blocked by the solenoid valve described later.

[0104] It should be noted that the “radial direction” of the reaction chamber 6 described below refers to a direction perpendicular to the up-down direction A of the reaction chamber 6 .

[0105] The lower end of the reaction chamber 6 is used to receive ammonia (including, for example, NH3·H2O) in the sample to be tested. Specifically, the lower end of the reaction chamber 6 may be provided with a semipermeable membrane 4, and the ammonia can penetrate the semipermeable membrane 4 and enter the reaction chamber 6. The distance between the detection end of the conductivity detection electrode 8 and the semipermeable membrane 4 may be, for example, 0.1 mm to 2 mm, preferably, not more than 1 mm. The upper end of the reaction chamber 6 is butted against the lower end of the communication passage 10, and the upper end of the communication passage 10 is butted against the liquid storage chamber 7, so that the upper end of the reaction chamber 6 can be indirectly connected to the liquid storage chamber 7.

[0106] It should be understood that when the ammonia nitrogen detection component is put into use, the liquid storage chamber 7 and the reaction chamber 6 may not be arranged vertically up and down due to the environment in which the ammonia nitrogen detection component is located (fluctuating with the water body to be tested). The "upper" and "lower" described herein are only used to indicate relative positional relationships.

[0107] The ammonia nitrogen detection component may include a solenoid valve and an electronic control device, the electronic control device controls the solenoid valve, the solenoid valve includes a cut-off piece 9, and the cut-off piece 9 reciprocates under the action of magnetic force to enter and exit the communication passage 10. The shape of the communication passage 10 is adapted to the cut-off piece 9 so that the cut-off piece 9 can be blocked, for example, filling the communication passage 10 to isolate the reaction chamber 6 and the liquid storage chamber 7.

[0108] Specifically, the cut-off piece 9 may be a block with a larger upper end and a smaller lower end, so that the cut-off piece 9 can enter the communication passage 10 quickly and safely.

[0109] In addition, the cutoff member 9 will disturb the reaction reagents in the liquid storage chamber 7 during the reciprocating motion, and promote the reaction reagents in the liquid storage chamber 7 to enter the reaction chamber 6. Optionally, the ammonia nitrogen detection component may also include a diffusion promotion mechanism to promote the diffusion. In a specific embodiment, the diffusion promotion mechanism is an electromagnetic oscillation component. The diffusion promotion mechanism can be set separately from the reaction chamber and the liquid storage chamber, or it can be set inside the liquid storage chamber, and work every time the liquid storage chamber 7 and the reaction chamber 6 are connected. When it is set inside the liquid storage chamber, an inert protective cover or other device is used according to the situation to prevent the diffusion promotion mechanism from reacting with the reaction reagents inside the liquid storage chamber.

[0110] like Figure 4a As shown, the stop member 9 is in a low position to isolate the reaction chamber 6 from the liquid storage chamber 7. Figure 4b As shown, the cut-off member 9 is in a high position to connect the reaction chamber 6 with the liquid storage chamber 7. During the service of the ammonia nitrogen detection component, the cut-off member 9 reciprocates along the up and down direction A to make the reaction chamber 6 and the liquid storage chamber 7 cyclically in a connected state and an isolated state.

[0111] like Figure 4c As shown, an electrical connection channel 11 may be provided between the reaction chamber 6 and the liquid storage chamber 7 , and the electrical connection channel 11 is used for passing a wire 111 connected to the electrode 8 .

[0112] The reaction chamber 6 may be provided with an exhaust port, which may be formed, for example, by the end of the electrical connection channel 11, and the exhaust port is used to discharge the hydrogen generated by the reaction in the reaction chamber 6. When the volume of the reaction chamber 6 is small, the air intake is limited, and most of the hydrogen generated can be dispersed in the reaction reagents. When the volume of the reaction chamber 6 is large, the amount of hydrogen generated is large, and the hydrogen generated by the reaction can be discharged through the exhaust port (electrical connection channel), thereby avoiding a significant increase in the gas pressure in the reaction chamber 6.

[0113] In a variation of this embodiment, the reaction chamber 6 can be directly connected to the liquid storage chamber 7, that is, there is no connecting passage 10, and the shut-off piece 9 can be a cover body perpendicular to the up and down direction A, so that the shut-off piece 9 can cover the upper end of the reaction chamber 6 and isolate the reaction chamber 6 from the liquid storage chamber 7.

[0114] Providing the reaction chamber 6 and the liquid storage chamber 7 in the up-down direction A is beneficial to reducing the radial dimension of the ammonia nitrogen detection component.

[0115] The stopper 9 may be disposed in the liquid storage chamber 7 . The materials of the stopper 9 , the reaction chamber 6 and the liquid storage chamber 7 may be materials that are resistant to acid, such as polyethylene, polytetrafluoroethylene, polyvinyl chloride or polypropylene.

[0116] In addition, the material of the cut-off piece 9 can be a material with lower density and softer texture, such as thermoplastic polyurethane elastomer rubber, thermoplastic elastomer material or rubber (except silicone rubber) and the like.

[0117] like Figure 5a and Figure 5b As shown, in another embodiment of the ammonia nitrogen detection component in the ammonia detection unit provided in the present disclosure, the structure of the ammonia nitrogen detection component is similar to the structure of the ammonia nitrogen detection component in the above-mentioned embodiment, and the differences mainly include the following aspects.

[0118] It should be noted that the “radial direction” of the functional chamber 12 described below is the same as the “radial direction” of the reaction chamber 6 .

[0119] The ammonia nitrogen detection component also includes a functional cavity 12, which is used to install the electronic components of the ammonia nitrogen detection component. The functional cavity 12 can be located above the reaction cavity 6, and the liquid storage cavity 7 can be located radially outside the reaction cavity 6 and the functional cavity 12. Specifically, the liquid storage cavity 7 can be surrounded by the outer periphery of the reaction cavity 6 and the functional cavity 12, and the cross section of the liquid storage cavity 7 (the cross section perpendicular to the up and down direction A) is annular. The reaction cavity 6 can be directly docked (communicated) with the liquid storage cavity 7 in its radial direction without passing through the communication passage 10.

[0120] The detection end of the conductivity detection electrode 8 is located in the reaction chamber 6, and the connector electrically connected to the outside can be located in the functional chamber 12. Arranging the functional chamber 12 and the reaction chamber 6 according to the above positional relationship can make full use of the internal space of the ammonia nitrogen detection component, which is conducive to miniaturizing the ammonia nitrogen detection component and simplifying the electrical connection design of the electrode 8.

[0121] The ammonia nitrogen detection component also includes an electric valve, the electric control device controls the electric valve, and the electric valve includes a cut-off piece 9 that can reciprocate along the up-down direction A. The reaction chamber 6 takes the up-down direction A as the axial direction, and the cut-off piece 9 can be a plate body that surrounds the reaction chamber 6.

[0122] The above-mentioned implementation method of matching the electric valve with the communication passage 10 has lower positioning requirements and is more conducive to mechanical implementation.

[0123] like Figure 5a As shown, the stop member 9 is in a low position to isolate the reaction chamber 6 from the liquid storage chamber 7. Figure 5b As shown, the cut-off member 9 is in a high position to connect the reaction chamber 6 with the liquid storage chamber 7. During the service of the ammonia nitrogen detection component, the cut-off member 9 reciprocates along the up and down direction A to make the reaction chamber 6 and the liquid storage chamber 7 cyclically in a connected state and an isolated state.

[0124] In a variation of this embodiment, the height of the liquid storage chamber 7 (the dimension in the up and down direction A) can also be less than or equal to the height of the reaction chamber 6, so that the liquid storage chamber 7 still surrounds the reaction chamber 6 on the radial outside of the reaction chamber 6, but does not surround the functional chamber 12.

[0125] In the above-described embodiment, the liquid storage chamber 7 is located at the radial outside (including the radially outer side or the radially oblique outer side) of the reaction chamber 6. In other embodiments, the liquid storage chamber 7 may also be located at other positions of the reaction chamber 6.

[0126] In other embodiments, the lower end of the reaction chamber 6 (the end for receiving ammonia gas) can be designed to be trumpet-shaped, which can more conveniently receive ammonia gas.

[0127] It should be understood that in other embodiments provided by the present invention, multiple (two or more than two) reaction chambers 6 can be provided, so that multiple results tested by multiple reaction chambers 6 can be used to verify each other, thereby enhancing the accuracy of the test.

[0128] Ammonia generation unit

[0129] In the present invention, the ammonia generating unit is a unit for generating ammonia. In some specific embodiments of the present invention, the ammonia generating unit is integrated with the ammonia detecting unit.

[0130] In addition, the ammonia generating unit of the present invention has one or more electrolysis electrodes, which, under the action of electric current, electrolyze the water entering the ammonia generating unit to generate hydroxide.

[0131] For the electrolysis electrode, it acts as an electrolysis cathode and the following electrolysis reaction occurs under the action of current:

[0132]

[0133] Through the continuous occurrence of electrolysis, the pH value of the water entering the ammonia generating unit continues to increase.

[0134] There is no particular limitation on the electrolytic electrode, and it can be prepared using various cathode materials for electrolyzing water in the art. In some specific embodiments, at least one of a carbon material, a graphite material, or a metal material such as platinum, iridium, or nickel can be used, and preferably, a graphite material or a platinum material can be used. There is no particular limitation on the shape of the electrolytic electrode, and it can be a sheet, a plate, a rod, or a film.

[0135] In addition, in some specific embodiments, in order to increase the reaction efficiency of the electrolysis cathode, an electrocatalyst layer can be formed on the surface of the electrolysis electrode, and the electrocatalyst can be those disclosed or used in the field of hydrogen production by electrolysis of water. The electrocatalyst can effectively reduce the electrolysis overpotential, thereby improving the efficiency of the electrolysis reaction.

[0136] The size of the electrode should be compatible with the internal size of the ammonia generating unit. In some preferred embodiments of the present invention, the electrode may be a square, rectangle or other polygon with a maximum side length not exceeding 30 mm.

[0137] As for the ammonia generating unit, it goes without saying that it also serves as a sampling device for the water body to be detected. There is no particular restriction on the capacity of the water body in the ammonia generating unit, which can be adjusted according to the size of the equipment. In addition, in some preferred embodiments, the water capacity in the water storage container in the ammonia generating unit can be between 20ml and 100ml, usually from the perspective of convenient calculation, for example, 20ml, 30ml, 40ml, 50ml, 60ml, 70ml, 80ml, 90ml or 100ml, etc. In addition, for the ammonia generating unit, optionally, a switch or valve can be provided, through which the sampling and the fixation of the water sample are carried out.

[0138] In addition, in some specific embodiments of the present invention, a gas diversion device is provided in the ammonia generating unit to separate the hydrogen generated from the surface of the electrolysis electrode from the ammonia generated in the unit. The specific gas diversion method is not particularly limited. Typically, a guide plate can be provided above the electrolysis electrode (in the direction normal to the horizon) or a gas guide hole can be provided above the electrolysis electrode so that the hydrogen generated from the surface of the electrolysis electrode can be discharged from the ammonia generating device more conveniently, and, advantageously, such a guide plate or gas guide hole is close to the surface of the electrolysis electrode.

[0139] For the electrolysis electrode, it needs to cooperate with the electrolysis counter electrode during operation. The electrolysis counter electrode is not particularly limited, as long as it is an electrode that can be oxidized under the action of electric current. Preferably, such an electrode can be an oxygen-producing electrode in a water electrolysis device. In some specific embodiments of the present invention, the electrolysis counter electrode can be included in the ammonia nitrogen detection device of the present invention, but it is independent of the ammonia generating unit; in some other specific embodiments of the present invention, the electrolysis counter electrode can be arranged at any other end away from the ammonia nitrogen detection device of the present invention. For example, the counter electrode can be placed in an independent unit or device on a ship or shore away from the water body.

[0140] In addition, for the electrolysis counter electrode of the present invention, its number can be the same as or different from the number of electrolysis electrodes. For example, the number of the electrolysis counter electrodes is less than the number of electrolysis electrodes, and at this time, two or more electrolysis electrodes are connected in parallel. In addition, in some other cases, the electrolysis electrodes in two or more ammonia nitrogen detection devices share one or more electrolysis counter electrodes.

[0141] When direct current is used to power the electrolysis electrode and the electrolysis counter electrode, hydroxide is generated in the ammonia generating unit of the present invention to increase the pH value of the water body to be tested enclosed in the unit. There is no particular restriction on the voltage between the electrolysis electrode (cathode) and the electrolysis counter electrode (anode) during electrolysis. From the perspective of energy saving and electrolysis efficiency, the voltage range can be 1.3 to 30 V, preferably 10 to 25 V.

[0142] There is no particular restriction on the power-on time, which is related to the capacity of the water body in the ammonia generating unit and the electrolysis voltage. In some specific embodiments of the present invention, the power-on time can be 10 to 120 seconds, preferably 15 to 40 seconds, that is, a sufficient concentration of electrolytic alkaline substances can be obtained; in other specific embodiments, the pH value of the water body to be detected in the ammonia generating unit is increased to above 12, preferably above 12.5, and further preferably above 13, through the electrolysis of the electrolysis electrode. As the pH value gradually increases, the ammonium ions in the water body to be tested are gradually converted into ammonia under high alkaline conditions, and overflow the water body, and come into contact with the ammonia sensitive material through the semipermeable membrane and gas entry channel described above.

[0143] Detection sensitivity

[0144] Compared with the previous equipment, the ammonia nitrogen detection equipment provided by the present invention can provide excellent detection accuracy and detection sensitivity without using external alkaline substances or alkaline reagents.

[0145] In some specific embodiments of the present invention, the detection limit of the present invention for ammonium ions can be as low as 1 mg / L, and in some embodiments can even reach 0.5 mg / L, and the (linear) range of detection can be 5-1000 mg / L.

[0146] In addition, the ammonia nitrogen detection equipment of the present invention, in addition to at least including the above-mentioned ammonia detection unit and ammonia generation unit, may also include one or more of the following structures or units when necessary.

[0147] Pre-electrolysis unit

[0148] In some specific embodiments of the present invention, the ammonia generation unit in the ammonia nitrogen detection equipment also includes a pre-electrolysis unit.

[0149] The pre-electrolysis unit can be arranged inside the ammonia generating unit, and can be connected to other spaces inside the ammonia generating unit by closing or opening a controllable valve. In this case, other spaces inside the ammonia generating unit can be used as the main space of the ammonia generating unit, and the space inside the pre-electrolysis unit can be used as the auxiliary space of the ammonia generating unit. In the auxiliary space, at least one electrolysis electrode is arranged to electrolyze the water entering the auxiliary space to produce OH under the condition of passing current. - . At this time, the auxiliary space is not connected to the main space of the ammonia generating unit, that is, the above-mentioned valve is in a closed state. The alkaline liquid obtained by electrolysis is stored in the auxiliary space, and when water body detection is required, the alkaline liquid is released into the main space of the ammonia generating unit by opening the valve. Therefore, in such an embodiment of the present invention, alkaline liquid can be generated as a reserve by pre-electrolysis, and the alkaline liquid can be released when water body detection is started, so as to achieve the purpose of rapid response and rapid detection.

[0150] In addition, the above-mentioned pre-electrolysis unit can be additionally arranged outside the ammonia generating unit, and connected to the ammonia generating unit by closing or opening a controllable valve / pipeline. In this case, the internal space of the ammonia generating unit can be used as the main space of the ammonia generating unit, and the internal space of the pre-electrolysis unit can be used as the auxiliary space of the ammonia generating unit.

[0151] Further, there is no particular limitation on the volume ratio between the main space and the (additional) auxiliary space in the ammonia generating unit. For example, in some specific embodiments, the volume ratio of the main space to the auxiliary space is 1:1 to 10:1, preferably 2:1 to 7:1, and more preferably 3:1 to 5:1.

[0152] In some other specific embodiments of the present invention, at least one electrolytic electrode can be provided in both the main space and the (additional) auxiliary space of the above-mentioned ammonia generating unit. On the one hand, when water quality testing is performed, the alkaline liquid in the auxiliary space can be released into the main space through a valve, and the electrolytic electrode in the main space can still be started to work, so that the pH value of the tested water body can be increased relatively quickly; on the other hand, providing more than one electrolytic electrode in both the above-mentioned main space and the auxiliary space can also prevent the detection from being unable to be performed due to a malfunction of the electrode in one of the spaces.

[0153] Counter electrode and self-cleaning

[0154] In some specific embodiments of the present invention, a counter electrode may be provided in the ammonia generating unit. The "counter electrode" in the present invention refers to a device that is different from the aforementioned electrolysis counter electrode and that can generate H by electrolysis reaction under current flow conditions. + of electrodes.

[0155] These counter electrodes can be arranged in the ammonia generating unit described above in one or more ways. In addition, when the above-mentioned main space and auxiliary space exist, one or more of the above-mentioned counter electrodes can be arranged in these spaces. In addition, in some other specific embodiments of the present invention, the electrolysis electrode described above itself can also be used as a counter electrode, as long as it is connected to the reverse current.

[0156] Considering that the electrolytic electrode of the present invention generates OH under current conditions - At the same time, considering that there are some metal ions in the water body to be tested, it is easy to produce precipitation or other types of impurities. Therefore, whenever necessary, the counter electrode is used for electrolysis to produce H + This helps dissolve or eliminate the above-mentioned undesirable deposits so as to achieve a self-cleaning effect on the ammonia generating unit.

[0157] Water body and filtration unit

[0158] The ammonia nitrogen detection device of the present invention is suitable for detecting or monitoring the nitrogen content in various water bodies. There is no particular limitation on the water body. In some specific embodiments of the present invention, the applicable water body can be river water, lake water, sea water, domestic or industrial wastewater, or a water body in the purified domestic or industrial wastewater.

[0159] When sampling these water bodies, various complex situations are usually encountered. Undesirable solid or microbial impurities may have an adverse effect on water sampling and subsequent monitoring, thereby reducing the detection accuracy or effectiveness of the ammonia nitrogen detection equipment of the present invention.

[0160] Therefore, in some specific embodiments of the present invention, the filtration unit may be placed before the ammonia generating unit so that the filtered water enters the water storage container in the ammonia generating unit each time sampling is performed.

[0161] Additional Alkaline Backup Unit

[0162] As mentioned above, the ammonia nitrogen detection device provided by the present invention does not need to add alkaline substances due to the presence of electrolytic electrodes. However, it goes without saying that in order to provide an effective redundant design, an additional alkaline substance backup unit can optionally be provided.

[0163] In this unit, a certain volume of solid or liquid alkaline substances, such as hydroxides of alkali metals, can be stored. When the working efficiency of the electrolytic electrode of a certain ammonia nitrogen detection equipment decreases or the work is unstable, these alkaline substances can be released to assist the generation of ammonia. In this way, accurate detection data can be provided stably and continuously even in unexpected situations. At the same time, since the above situation is a low-probability event, it will not cause a significant burden on the maintenance of the equipment.

[0164] Float assist unit

[0165] When the ammonia nitrogen monitoring device of the present invention is used for water body detection, it can be placed in the water body to be detected in a floating, submerged or semi-submerged manner. In such a placement, at least the ammonia generating unit of the ammonia nitrogen detection device of the present invention is immersed in the water body, so as to facilitate water sampling at any time.

[0166] The placement of the above detection equipment can be achieved through a floating auxiliary unit. In some specific embodiments of the present invention, the floating auxiliary unit has a frame for fixing the ammonia nitrogen detection equipment, and optionally, it can also have an adjustable floating weight. By adjusting the shape and / or weight of the floating weight, the posture of the ammonia nitrogen monitoring equipment can be adjusted and the equipment can be stabilized, especially under the condition of detection in flowing water, it can play a balancing or anchoring role.

[0167] Power supply unit

[0168] As mentioned above, the present invention performs electrolysis and detection of the water body to be tested by supplying direct current to the electrolysis electrode and the electrolysis counter electrode.

[0169] For the source of direct current, it can be powered by an independent power supply unit. In some specific embodiments of the present invention, such a unit can be a power generation device placed away from the location of (each) ammonia nitrogen detection device. Direct current is independently provided to (each) ammonia nitrogen detection device by the power generation device.

[0170] In some other specific embodiments of the present invention, the ammonia nitrogen detection device may have a self-powered unit, for example, such a self-powered unit may be integrated with the ammonia nitrogen detection device or connected via a wire. In some typical embodiments, such a power supply unit may come from clean energy such as solar energy, wind energy, and water flow energy. In any necessary case, when the power supply unit is a self-powered unit, an energy storage unit may be provided in the ammonia nitrogen detection device, and such an energy storage unit may be based on a battery that can be repeatedly charged and discharged, for example, a lithium-ion secondary battery, etc.

[0171] Temperature compensation unit

[0172] In the present invention, the ammonia nitrogen detection device is used to detect the water body to be detected. Generally, it is advantageous to detect under the condition of normal temperature of the water body. The "normal temperature of the water body" in the present invention is a concept related to the geographical location. According to the different latitudes of different water bodies, such a normal temperature can be between 5°C and 25°C.

[0173] Under some conditions, the water temperature may be too low, or for the same water body, the temperature may vary greatly in different months or seasons, which is disadvantageous for the detection accuracy and stability of the ammonia nitrogen detection device of the present invention. Therefore, the use of a temperature compensation unit can be used to improve the accuracy and stability of the detection.

[0174] In some specific embodiments, for the temperature compensation device, the ammonia nitrogen detection equipment can be heated by the power provided by the above-mentioned power supply to maintain the equipment working under suitable and stable temperature conditions.

[0175] In other specific embodiments, when the temperature of the water body to be tested is too low, the ammonia nitrogen detection equipment is heated within a period of time before the water quality test, for example, 1 to 30 minutes before starting the detection equipment, preferably 2 to 10 minutes, especially the water body to be tested that has entered the ammonia generation unit in the equipment is heated.

[0176] In addition, other functions of the temperature compensation unit also include heating the above-mentioned ammonia detection unit when necessary. By heating the unit, the temperature of the ammonia sensitive material in the unit is increased. After the detection is completed, the ammonia adsorbed on the ammonia sensitive material can be desorbed by this method, which is beneficial to the rapid regeneration of the ammonia sensitive material and the next detection.

[0177] Signal transmitting or receiving unit

[0178] The ammonia nitrogen detection device of the present invention may optionally include a signal transmitting or receiving unit.

[0179] In some specific embodiments of the present invention, when a plurality of ammonia nitrogen detection devices are used to detect a water body, each ammonia nitrogen detection device can wirelessly transmit information or receive instructions through a signal transmitting or receiving unit.

[0180] There is no particular limitation on the type of such signal transmitting or receiving unit, which may include but is not limited to the following devices:

[0181] Position information device, which can provide the location information of the detection equipment according to the global satellite positioning system, Beidou navigation system and other positioning systems, which is especially beneficial for the maintenance, recovery or layout of the equipment;

[0182] The status information device can provide information such as the status of the ammonia nitrogen detector itself (such as remaining power, fault information, detection equipment number, energy usage rate and timestamp) through various sensors;

[0183] An information transmission device can transmit various information based on Bluetooth or wireless networks, such as Wi-Fi networks, 4G or 5G networks;

[0184] Instruction receiving and microcontroller device to receive various instructions to perform actions such as water body monitoring, position or attitude adjustment, etc.

[0185] <Second Aspect>

[0186] In the second aspect of the present invention, a method for detecting nitrogen elements, especially ammonium ion content in water is provided, in which one or more ammonia nitrogen detection devices described in the above <first aspect> are used to detect the water to be tested.

[0187] Generally, for the detection of water bodies in open waters, it is advantageous to have the detection equipment distributed in multiple locations within a certain range. In some preferred embodiments of the present invention, it is advantageous to use more than one, preferably more than two, ammonia nitrogen detection devices of the present invention per square kilometer of water surface area.

[0188] In other cases, for the river basin being tested, the detection equipment can be arranged based on the length per kilometer. For example, it is advantageous to use more than one, preferably more than two, ammonia nitrogen detection devices of the present invention per kilometer of river length.

[0189] Multiple detection devices simultaneously provide data on water quality conditions at different locations in open waters, which is beneficial for evaluating the overall water quality and water quality changes in the waters.

[0190] In addition, the ammonia nitrogen detection device provided by the present invention is particularly suitable for online detection and monitoring of various water bodies. Through the information processing system, terminal display system and control system, and optionally, in conjunction with other water quality detection units (such as heavy metal content detection units, phosphorus content detection units, chemical oxygen demand COD detection units, etc.), the water quality detection of the water body to be tested can be performed in real time online.

[0191] Example

[0192] Hereinafter, the technical solution of the present invention will be specifically described through specific embodiments.

[0193] Example 1

[0194] Testing equipment :

[0195] Ammonia nitrogen detection equipment such as Figure 2 As shown, it includes:

[0196] 1'. Ammonia sensitive material (built-in conductivity detection electrode);

[0197] 2'. Electrolytic electrode (cathode);

[0198] 3'. Electrolysis counter electrode (anode);

[0199] 4'. Semipermeable membrane

[0200] The materials of 1'-4' can be obtained commercially. Meanwhile, the ammonia nitrogen detection device has a housing (not shown), and the electrolytic electrode 2 is placed in the ammonia generating unit surrounded by the housing through a fixing device (not shown). In addition, the ammonia generating unit has an entrance and exit (not shown) to the outside world. During operation, a DC power supply is provided by a DC power supply device (not shown).

[0201] The cathode is 3mm away from the semipermeable membrane, and the distance between the cathode and the anode is 3cm. The voltage of the direct current between the cathode and the cathode is 24V.

[0202] Test fluid conditions :

[0203] Initial conductivity of ammonia sensitive material: 80±5μS / cm

[0204] Detection solution pH: 6-8

[0205] Detection liquid temperature: 24-25℃

[0206] Standard ammonium ion solutions were prepared using (NH4)2SO4 as the reference substance, and standard solutions with ammonium ion contents of 5 mg / L, 10 mg / L, 25 mg / L, 50 mg / L and 100 mg / L were prepared respectively.

[0207] Testing Process :

[0208] Place the above detection equipment in a test liquid of a certain concentration.

[0209] The test starts from the time the positive and negative electrodes are powered on (0 seconds at this time), the power-on time is 30 seconds, and the response curve of the conductivity detection electrode inside the ammonia sensitive material is recorded within 0-90 seconds to obtain the slope value (conductivity change rate) corresponding to the test liquid.

[0210] Plotting the slope values ​​of each test solution, the following graph can be obtained (see Figure 3 ) shown in the figure. By fitting the curve, the relationship between the conductivity change rate and the ammonia nitrogen concentration can be obtained. It has been verified that the correlation coefficient is R 0.998.

[0211] It should be noted that, although the technical solution of the present invention is introduced with specific examples, those skilled in the art will appreciate that the present disclosure should not be limited thereto.

[0212] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

[0213] Industrial Applicability

[0214] The ammonia nitrogen detection equipment provided by the present invention can be used in industry for water quality detection of various water bodies.

Claims

1. An ammonia nitrogen detection device, characterized in that: include: Ammonia detection unit; Ammonia generating unit; The ammonia generating unit includes an electrolytic electrode, and the electrolytic electrode electrolyzes the water to be tested entering the ammonia generating unit under a DC voltage of 10 to 25 V to generate OH under a current condition. - , In the OH - Under the action of + is converted into ammonia and enters the ammonia detection unit, The water body to be tested in the ammonia generating unit does not include industrial wastewater.

2. The device according to claim 1, characterized in that A semipermeable membrane is provided between the ammonia generating unit and the ammonia detecting unit, and the semipermeable membrane does not allow liquid molecules to penetrate.

3. The device according to claim 1 or 2, characterized in that The ammonia generating unit comprises one or more electrolysis electrodes.

4. The device according to any one of claims 1 to 3, characterized in that: The water body to be tested in the ammonia generating unit is selected from river water, lake water, sea water, domestic wastewater, or purified domestic or industrial wastewater.

5. The device according to any one of claims 1 to 4, characterized in that: The ammonia generating unit includes a pre-electrolysis unit, and at least one electrolysis electrode is placed in at least the pre-electrolysis unit in the ammonia generating unit.

6. The device according to any one of claims 1 to 5, characterized in that: The ammonia generating unit further comprises a counter electrode, which electrolyzes the water to be tested entering the ammonia generating unit under the condition of passing current to generate H + .

7. The device according to any one of claims 1 to 6, characterized in that: The ammonia gas detection unit includes an ammonia nitrogen detection component, which includes a reaction chamber and a liquid storage chamber, and the volume of the liquid storage chamber is greater than the volume of the reaction chamber.

8. The device according to claim 7, characterized in that The reaction chamber includes a conductivity-responsive electrode.

9. The device according to any one of claims 1 to 7, characterized in that: The ammonia detection unit calculates the NH4 in the water to be detected based on the changes in optical, electrical or chemical parameters. + concentration.

10. The device according to any one of claims 1 to 9, characterized in that: The ammonia nitrogen detection device also includes a temperature compensation unit.

11. The device according to any one of claims 1 to 10, characterized in that: The current is direct current.

12. A device for detecting water quality, characterized in that: Comprising one or more devices according to any one of claims 1 to 11.

13. A method for online detection of water quality of river or lake water, characterized in that: The method comprises using the device according to any one of claims 1 to 12 to detect NH4 + concentration.

14. The method according to claim 13, characterized in that For every square kilometer of water surface area, two or more devices according to any one of claims 1 to 12 are used.

Images