Sewage pH value on-line detection device and detection method

Abstract

The sewage pH value online detection device comprises a detection assembly, the detection assembly comprises an outer sleeve and a detection rod, the outer sleeve is provided with an upper end opening and a lower end opening, the lower end opening of the outer sleeve is connected with a lower connecting pipe, the upper portion and the lower portion of the lower connecting pipe form an upper connecting end and a lower extending end respectively, and the upper connecting end and the lower extending end are connected with the detection rod. The upper connecting end is detachably connected with a lower port of the outer sleeve, and the lower extending end is used for extending into a to-be-detected sample liquid level; a detection end is formed at the lower end of the detection rod, and the detection rod extends into the outer sleeve from the upper port, extends out of the lower port and extends into the lower connecting pipe; the piston block is connected into the piston barrel in the vertical direction in a piston mode, and a piston cavity is formed in the lower side of the piston block; a first connector is formed in the bottom of the piston cavity and connected with the outer sleeve through a guide pipe, and the connecting position of the guide pipe is located above the detection end. The device can detect the pH value of water quality.

Description

Technical Field

[0001] This invention relates to the field of water quality testing technology, and more specifically, to an online device for detecting the pH value of wastewater, and also to a method for online detection of the pH value of wastewater. Background Technology

[0002] In today's society, environmental protection and water quality monitoring are receiving unprecedented attention. Accurate and timely water quality testing is crucial for ensuring aquatic ecological security and human health. Wastewater testing typically involves measuring key indicators such as total phosphorus, total nitrogen, pH, and COD to accurately assess water quality. Among these, pH is a vital parameter in wastewater testing, especially for certain heavily monitored polluting industries, where pH levels provide the clearest and most direct indication of the degree of pollution.

[0003] Currently, pH testing of wastewater typically uses a pH meter, which requires immersing its sensor tip in the sample to be tested. The pH value is then directly read from the meter. However, when continuously testing multiple wastewater samples, the sensor tip of the pH meter needs to be cleaned after each test, usually by rinsing with distilled water to minimize residue from the previous test. After drying, the meter is then used to test the next set of wastewater samples.

[0004] During the testing process, the surface of the pH meter's detection end may not be completely dry, meaning that a certain amount of water will mix into the sample. This will dilute the sample to some extent and affect the accuracy of the pH value detection. This effect will be amplified, especially for samples with small volumes.

[0005] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an online detection device and method for wastewater pH value.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an online pH detection device for wastewater, comprising a detection component, the detection component including an outer tube and a detection rod, the outer tube having an upper port and a lower port, the lower port of the outer tube being connected to a lower connecting pipe, the upper and lower ends of the lower connecting pipe forming an upper connecting end and a lower extending end respectively, the upper connecting end being detachably connected to the lower port of the outer tube, and the lower extending end being used to extend into the sample liquid surface to be detected; the lower end of the detection rod forming a detection end, the detection rod extending from the upper port of the outer tube, extending from the lower port, and extending into the lower connecting pipe; further comprising a piston cylinder and a piston block, the piston block being piston-connected to the piston cylinder in the vertical direction, the lower side of the piston block forming a piston cavity; the bottom of the piston cavity having an interface, the interface being connected to the outer tube through a conduit, and the connection position of the conduit being located above the detection end.

[0008] The invention is further configured such that the conduit is equipped with a second valve, which can control the opening and closing of the conduit; the bottom of the piston chamber is also provided with an interface second, which is connected to a distilled water source through a water supply pipe, and the water supply pipe is equipped with a third valve, which can control the opening and closing of the water supply pipe.

[0009] The present invention is further configured such that a connecting rod is fixedly connected to the upper end of the piston block, and the connecting rod is driven by a servo driver.

[0010] The present invention is further configured such that an air inlet is provided on the upper outer periphery of the outer sleeve, the air inlet is connected to an air duct, and a valve is installed on the air duct.

[0011] The present invention is further configured such that a valve is installed on the lower pipe, and the valve can control the opening and closing of the lower pipe.

[0012] The present invention is further configured such that two sets of detection components are arranged side by side, and a connecting pipe is connected between the two lower pipes in the two sets of detection components, and a valve is installed on the connecting pipe; the valve can control the opening and closing of the connecting pipe.

[0013] The connection point of the first connecting pipe is located above the first valve.

[0014] The invention is further configured such that the upper outer ends of the two outer sleeves are connected by a connecting pipe 2, and the connecting pipe 2 is equipped with a valve 6, which can control the opening and closing of the connecting pipe 2.

[0015] This invention also provides an online method for detecting the pH value of wastewater, using the detection device described above, and comprising the following steps:

[0016] Step 1: Add a test sample with a volume of L into the test container;

[0017] Step 2: Install the lower connecting pipe on the lower end of the outer tube, move the detection device, and insert the lower extension end of the lower connecting pipe below the liquid surface of the sample.

[0018] Step 3: The piston block is raised by the servo system, generating negative pressure in the piston chamber. The piston chamber and the inner chamber of the outer tube are connected by a conduit, and the sample is drawn in from the lower tube until the sample liquid level covers the detection end.

[0019] Step 4: Detect the pH value X0 of the sample using the detection terminal;

[0020] Step 5: The piston block is lowered by the servo system to discharge the test sample from the lower tube.

[0021] Step 6: Cut off the conduit and control the piston block to rise via the servo system, drawing the diluted distilled water into the piston chamber;

[0022] Step 7: Connect the conduit, and then control the piston block to descend via the servo system to input distilled water for dilution into the outer tube. The input amount is L2. The distilled water is mixed into the test sample to dilute the test sample.

[0023] Step 8: The piston block is raised by the servo system, generating negative pressure in the piston chamber. The piston chamber and the inner chamber of the outer tube are connected by a conduit. The sample is drawn in from the lower tube until the sample liquid level covers the detection end. The pH value X1 of the diluted sample is detected through the detection end.

[0024] Step 9: Repeat steps 5-8 for N times to obtain the reagent detection values ​​X1, X2, X3...Xn for each test;

[0025] Step 10: Based on the initial X0, calculate the theoretical values ​​X'1, X'2, X'3...X'n after several dilutions.

[0026]

[0027] The theoretical value of pH in the initial state can be calculated from the measured value Xn after the nth dilution.

[0028]

[0029] By combining the value of Yn with the weights, the final pH value Yz of the initial state of the test sample is obtained.

[0030] In summary, the present invention has the following beneficial effects:

[0031] By actively diluting the sample, the pH value after dilution can be detected. Then, by using parameters such as the original sample volume L1 and the volume of dilute distilled water, the original pH value of the sample can be obtained. Active dilution can reduce the dilution effect of water adhering to the surface of the detection end on the sample, thereby improving the accuracy of water quality pH detection to a certain extent. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of an online wastewater pH detection device according to an embodiment;

[0033] Figure 2 This is a schematic diagram of the structure of an online wastewater pH detection device according to Example 2.

[0034] Reference numerals: Detection container 100; Outer tube 1; Upper port 101; Lower port 102; Air inlet 103; Detection rod 2; Detection end 201; Lower pipe 3; Upper connecting end 301; Lower extension end 302; Valve 1 4; Piston cylinder 5; Piston chamber 501; Interface 1 502; Interface 2 503; Piston block 6; Connecting rod 601; Conduit 7; Valve 2 701; Water supply pipe 8; Valve 3 801; Connecting pipe 1 901; Valve 5 902; Connecting pipe 2 903; Valve 6 904; Air duct 10; Valve 4 1001. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1

[0037] This embodiment discloses an online wastewater pH detection device, referring to... Figure 1 As shown, the device includes a detection assembly, which includes an outer tube 1 and a pH meter. The outer tube 1 has an upper port 101 and a lower port 102. A lower connecting tube 3 is connected to the lower port 102 of the outer tube 1. The lower connecting tube 3 adopts a detachable assembly structure, which can be disassembled and replaced.

[0038] The lower connecting pipe 3 forms an upper connecting end 301 and a lower extension end 302 at the top and bottom respectively. The upper connecting end 301 is detachably connected to the lower port 102 of the outer sleeve 1. Specifically, the connection can be achieved by mutual fitting, and the sealing of the connection can be maintained after fitting.

[0039] During the detection process, the lower extension end 302 can extend into the surface of the sample liquid to be tested.

[0040] The pH meter has a detection rod 2, which enables the detection of reagents in the sample. The lower end of the detection rod 2 forms a detection end 201. When the detection end 201 enters the sample liquid surface, pH detection can be achieved.

[0041] During installation, the pH meter's detection rod 2 extends into the outer sleeve 1 from the upper port 101 and extends out from the lower port 102. The detection end 201 of the detection rod 2 extends out of the outer sleeve 1 and can reach into the lower connecting pipe 3.

[0042] In addition, the detection device in this embodiment also includes a piston cylinder 5 and a piston block 6. The size of the piston block 6 is piston-connected to the inner cavity of the piston cylinder 5. The piston block 6 is piston-connected to the piston cylinder 5 in the vertical direction to form a piston connection structure. A piston cavity 501 is formed on the lower side of the piston block 6. The piston adjustment operation can be realized by adjusting the piston of the piston block 6 to adjust the piston of the piston cavity 501.

[0043] An interface 502 is provided at the bottom of the piston chamber 501. The interface 502 is connected to the outer sleeve 1 through a conduit 7, and the connection position of the conduit 7 is located above the detection end 201. A valve 701 is installed on the conduit 7, and the opening and closing of the conduit 7 can be controlled by the valve 701.

[0044] A second interface 503 is also provided at the bottom of the piston chamber 501. The second interface 503 is connected to a distilled water source through a water supply pipe 8. Distilled water can be supplied into the piston chamber 501 through the water supply pipe 8 as a diluent for the test sample. A third valve 801 is installed on the water supply pipe 8, which can control the opening and closing of the water supply pipe 8.

[0045] The piston block 6 is driven and controlled by a servo driver. Specifically, a connecting rod 601 is fixedly connected to the upper end of the piston block 6. The connecting rod 601 extends upward and connects its upper end to the drive end of the servo driver. The servo driver drives the connecting rod 601, causing the piston block 6 to move. By controlling the lifting and lowering displacement of the piston block 6, the input and output of the piston chamber 501 can be controlled, which facilitates accurate detection control.

[0046] Furthermore, an air inlet 103 is provided on the upper outer periphery of the outer sleeve 1. The air inlet 103 is connected to an air duct 10, which connects to a ventilation source and the air inlet 103, enabling air to be supplied into the outer sleeve 1. By supplying air into the outer sleeve 1, upward airflow can be achieved within the outer sleeve 1, drying the detection end 201 of the detection rod 2 and removing distilled water from its surface, thereby improving the accuracy of subsequent re-detection. Additionally, a valve 1001 is installed in the air duct 10, which can be used to shut off the air duct 10, allowing it to be closed when the drying chamber is not needed, thus preventing liquid backflow.

[0047] Furthermore, a valve 4 is installed on the lower connector 3, which controls the opening and closing of the lower connector 3. When liquid needs to flow through the lower connector 3, the valve 4 can be used to open the lower connector 3 to maintain normal liquid flow; when the valve 4 is closed, the lower connector 3 can be disconnected, thereby temporarily buffering a certain amount of liquid at the upper end of the lower connector 3, allowing distilled water to remain in the lower connector 3, so that the detection end 201 of the detection rod 2 can be immersed in distilled water for a certain period of time, which is beneficial for cleaning the detection end 201 of the detection rod 2.

[0048] This embodiment also provides an online method for detecting the pH value of wastewater. The detection device described above is used for detection. Considering the ionization of hydrogen ions in the water, the method in this embodiment is generally applicable to the detection of wastewater samples with a pH value of less than 5.

[0049] The specific steps are as follows:

[0050] Step 1: Add a test sample of volume L1 into the test container 100;

[0051] Step 2: Install the lower connecting pipe 3 onto the lower port 102 of the outer tube 1, and maintain the connection stability and sealing between the lower connecting pipe 3 and the outer tube 1 after installation; by moving the detection device, the lower extension end 302 of the lower connecting pipe 3 can be inserted below the liquid surface of the test sample.

[0052] Step 3: Open valve 1 (4) and valve 2 (701), and close valve 3 (801) and valve 4 (1001); then control the piston block 6 to rise through the servo system, generating negative pressure in the piston chamber 501. The piston chamber 501 and the inner cavity of the outer tube 1 are connected through the conduit 7, and the sample is drawn in from the lower tube 3 until the sample liquid level covers the detection end 201.

[0053] Step 4: Detect the pH value of the sample using the detection terminal 201 to obtain the initial detection value X0;

[0054] Step 5: The piston block 6 is lowered by the servo system to discharge the test sample from the lower tube 3;

[0055] Step 6: Open valve 1 (4), valve 3 (801), valve 2 (701), and valve 4 (1001) by controlling valve 1; cut off conduit 7, and control piston block 6 to rise by servo system to generate negative pressure in piston chamber 501. Diluted distilled water can be drawn into piston chamber 501 through water supply pipe 8.

[0056] Step 7: Open valve 1 (4) and valve 2 (701), and close valve 3 (801) and valve 4 (1001); connect conduit 7, and then control the piston block 6 to descend via the servo system to input distilled water for dilution into the outer tube 1. Control the movement of piston block 6 via the servo system to control the amount of distilled water output from the outer tube 1. The amount of distilled water input is L2, which can mix distilled water into the test sample to dilute the test sample.

[0057] In order to ensure that the distilled water in the outer tube 1 can fall quickly, valve 4 1001 can be opened in a timely manner to balance the pressure inside the outer tube 1, so that the input distilled water can fall smoothly into the detection container 100 to dilute the test sample; then, valve 4 1001 can be closed again, and then opened again during the subsequent air drying process.

[0058] Step 8: Open valve 1 (4) and valve 2 (701), and close valve 3 (801) and valve 4 (1001); control piston block 6 to rise via servo system, generating negative pressure in piston chamber 501, connecting piston chamber 501 and inner cavity of outer tube 1 via conduit 7, and draw the sample into the lower tube 3 until the sample liquid level covers the detection end 201; detect the pH value X1 of the diluted sample via detection end 201;

[0059] Based on the sample volume L1, the amount of distilled water added L2, and the initial measured pH value X0, the pH value of the buffer solution can be calculated using the formula for pH change; the pH value after dilution is measured as X1.

[0060] During the first dilution process, after adding L2 of distilled water, the total volume V1 becomes L1 + L2; at this point, the sample is diluted, and the pH value will change. Generally, L2 ranges from 0.5L1 to 2L1.

[0061] H of the initial test sample + 10 -X0 diluted H + (L1 / (L1+L2))×10 -X0 The theoretical value X'1 of the pH value after the first dilution can be calculated:

[0062]

[0063] Similarly, the theoretical value of pH Y1 in the initial state can be calculated by using the detection value X1 after the first dilution.

[0064]

[0065] Step 9: Repeat steps 5-8 for N times to obtain the reagent detection values ​​X1, X2, X3...Xn for each test.

[0066] Step 10: Based on the initial X0, calculate the theoretical values ​​X'1, X'2, X'3...X'n after several dilutions.

[0067]

[0068] Similarly, the theoretical pH value Yn of the initial state can be calculated by using the measured value Xn after the nth dilution.

[0069]

[0070] By comparing the diluted theoretical value Yn with the initial measured value X0, the deviation value δn is obtained, Xn = X'n + δn;

[0071] By calculating the pH values ​​Yi (i = 1, 2, 3...n) for multiple initial states, the final initial pH value Yz can be calculated using Yi and weights. Generally, the vertical weights are averaged across all calculations.

[0072]

[0073] Specifically, in step 9, the process is repeated several times to eliminate obviously unreasonable values, resulting in parameters from 3-5 tests. The pH value Yz of the initial state of the final test sample is then calculated.

[0074] Alternatively, the measured pH value X0 in the initial state can be introduced, where X0 is Y0; correspondingly, Yz can be obtained.

[0075]

[0076] Example 2

[0077] This embodiment discloses an online pH detection device for wastewater, which is based on Embodiment 1 and further refers to... Figure 2 Please provide a detailed explanation.

[0078] In this embodiment, two sets of detection components are arranged side by side, and a connecting pipe 901 is connected between the two lower pipes 3 in the two sets of detection components. A valve 902 is installed on the connecting pipe 901. The valve 902 can control the opening and closing of the connecting pipe 901. The connection position of the connecting pipe 901 is located above the valve 4.

[0079] The two outer outer tubes 1 are connected by a connecting pipe 2 903 at their upper outer ends. A valve 6 904 is installed on the connecting pipe 2 903, which can control the opening and closing of the connecting pipe 2 903.

[0080] During the testing process, two sets of testing components can be used to perform separate tests on the samples. By controlling valves 5 (902) and 6 (904), the outer sleeve 1 and connecting pipe 1 (901) can be connected and disconnected. When connected, both can be easily rinsed; when disconnected, they do not interfere with each other and can be tested on the samples relatively independently.

[0081] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An online pH detection device for wastewater, characterized in that, The device includes a detection assembly comprising an outer tube (1) and a detection rod (2). The outer tube (1) has an upper port (101) and a lower port (102). The lower port (102) of the outer tube (1) is connected to a lower connecting tube (3). The upper and lower ends of the lower connecting tube (3) respectively form an upper connecting end (301) and a lower extension end (302). The upper connecting end (301) is detachably connected to the lower port (102) of the outer tube (1). The lower extension end (302) is used to extend into the sample liquid surface to be detected. The lower end of the detection rod (2) forms a detection end (2). 01), the detection rod (2) extends into the upper port (101) of the outer tube (1), extends out from the lower port (102), and extends into the lower tube (3); it also includes a piston cylinder (5) and a piston block (6), the piston block (6) is piston-connected to the piston cylinder (5) in the vertical direction, and the lower side of the piston block (6) forms a piston cavity (501); the bottom of the piston cavity (501) is provided with an interface (502), the interface (502) is connected to the outer tube (1) through a conduit (7), and the connection position of the conduit (7) is located above the detection end (201).

2. The online wastewater pH detection device according to claim 1, characterized in that, The conduit (7) is equipped with valve two (701), which can control the opening and closing of the conduit (7); the bottom of the piston chamber (501) is also provided with interface two (503), which is connected to the distilled water source through the water supply pipe (8), and the water supply pipe (8) is equipped with valve three (801), which can control the opening and closing of the water supply pipe (8).

3. The online wastewater pH detection device according to claim 1, characterized in that, The piston block (6) is fixedly connected to a connecting rod (601) at its upper end, and the connecting rod (601) is driven by a servo driver.

4. The online wastewater pH detection device according to claim 1, characterized in that, An air inlet (103) is provided on the upper outer periphery of the outer sleeve (1), and the air inlet (103) is connected to an air duct (10), and the air duct (10) is equipped with a valve (1001).

5. The online wastewater pH detection device according to claim 1, characterized in that, The lower pipe (3) is equipped with a valve (4), which can control the opening and closing of the lower pipe (3).

6. The online wastewater pH detection device according to claim 5, characterized in that, The detection components are arranged in two groups side by side, and in the two groups of detection components, a connecting pipe (901) is connected between the two lower pipes (3), and a valve (902) is installed on the connecting pipe (901); the valve (902) can control the opening and closing of the connecting pipe (901); The connection position of the connecting pipe (901) is located above the valve (4).

7. The online wastewater pH detection device according to claim 6, characterized in that, The upper outer ends of the two outer sleeves (1) are connected by a connecting pipe two (903). The connecting pipe two (903) is equipped with a valve six (904), which can control the opening and closing of the connecting pipe two (903).

8. A method for online detection of pH value in wastewater, characterized in that, The detection is performed using the detection device as described in any one of claims 1-7, comprising the following steps: Step 1: Add a test sample of volume L1 into the test container (100); Step 2: Install the lower tube (3) on the lower port (102) of the outer tube (1), move the detection device, and insert the lower extension end (302) of the lower tube (3) below the liquid surface of the sample. Step 3: The piston block (6) is raised by the servo system, generating negative pressure in the piston chamber (501). The piston chamber (501) and the inner cavity of the outer tube (1) are connected by the conduit (7). The sample is drawn in from the lower tube (3) until the sample liquid level is above the detection end (201). Step 4: Detect the pH value X0 of the test sample using the detection end (201); Step 5: Control the piston block (6) to descend via the servo system, and discharge the test sample from the lower tube (3); Step 6: Cut off the conduit (7), and control the piston block (6) to rise through the servo system to draw the diluted distilled water into the piston chamber (501); Step 7: Connect the conduit (7), and then control the piston block (6) to descend through the servo system to input distilled water for dilution into the outer tube (1). The input amount is L2, and the distilled water is mixed into the test sample to dilute the test sample. Step 8: The piston block (6) is raised by the servo system, generating negative pressure in the piston chamber (501). The piston chamber (501) and the inner cavity of the outer tube (1) are connected by the conduit (7). The sample is drawn in from the lower tube (3) until the sample liquid level is above the detection end (201). The pH value X1 of the diluted sample is detected by the detection end (201).

9. The online method for detecting wastewater pH according to claim 8, characterized in that, The steps also include the following: Step 9: Repeat steps 5-8 for N times to obtain the reagent detection values ​​X1, X2, X3...Xn for each test; Step 10: Based on the initial X0, calculate the theoretical values ​​X'1, X'2, X'3...X'n after several dilutions. The theoretical value X'n is obtained.

10. The online method for detecting wastewater pH according to claim 9, characterized in that, The theoretical value of pH in the initial state can be calculated from the measured value Xn after the nth dilution. By combining the value of Yn with the weights, the final pH value Yz of the initial state of the test sample is obtained.

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