CN209231218U - A semi-quantitative on-line detection device for Mn(II) content in water - Google Patents

Abstract

The utility model relates to a kind of sxemiquantitative on-line measuring devices of Mn (II) content in water body.The device includes detection unit, sample injection unit, adds unit, color recognition unit, abandons sample unit, testing result output unit and control unit.The detection unit includes multiple transparent organic glass square ware and matched agitating device being laterally arranged successively；The sample injection unit includes multiple water inlet peristaltic pumps；The unit that adds includes multiple dosing peristaltic pumps, potassium permanganate fluid reservoir；The color recognition unit includes that multiple color sensors, multiple color developing agents add peristaltic pump, color developing agent fluid reservoir；The abandoning sample unit includes multiple draining peristaltic pumps.The utility model can carry out rapid semi-quantitative detection directly against Mn (II) content in water body, and the detection used time is short, can carry out on-line real-time measuremen in making aquatic production, adjust water processing parameter processed to remind in time.

Description

A semi-quantitative on-line detection device for Mn(II) content in water

technical field

The utility model relates to the technical field of drinking water treatment, in particular to a semi-quantitative online detection device and a detection method for Mn(II) content in a water body.

Background technique

When the manganese content in drinking water exceeds 0.05mg/L, a series of problems will occur, such as the accumulation of pipeline sediments, yellow and black water quality, and metallic astringency when drinking. Long-term intake of drinking water with excessive manganese can also cause neuronal degeneration and motor dysfunction. Therefore, various countries have established relatively strict limit standards for manganese content in drinking water. The limit value of the European Union and the US Environmental Protection Agency is 0.05mg/L (the limit value of my country is 0.10mg/L).

Manganese in raw water mainly exists in the form of valence II or Ⅳ, among which Mn(Ⅳ) mostly exists in the form of suspended matter, which can be removed in coagulation and sedimentation. The dissolved manganese is mainly Mn(Ⅱ), which is removed during production. key substance. At present, most water plants use potassium permanganate oxidation to remove manganese. Potassium permanganate is used to oxidize Mn(II) to Mn(IV), and then remove it through coagulation and precipitation. The theoretical reaction ratio is 1.92mg KMnO ₄ /mg Mn(II). However, because the raw water also contains other reducing substances, it is difficult to accurately grasp the actual dosage of potassium permanganate. When the dosage of potassium permanganate is insufficient or excessive, the manganese content in the factory water will exceed the standard. Therefore, how to judge the suitability of the dosage of potassium permanganate is an important issue that needs to be considered in the water production.

The traditional method is to test the manganese content of raw water and factory water respectively, and then judge the suitability of potassium permanganate dosage and whether to adjust it according to the test results. At present, the detection method of manganese content in water body is mainly aimed at the detection of total manganese content. For the detection of Mn(II) content in water body, it is usually to filter the water sample with a 0.45 μm filter membrane, and then follow the detection method of total manganese. detection. The detection methods of total manganese content mainly include spectrophotometry, atomic absorption spectrometry and inductively coupled plasma emission spectrometry. Spectrophotometric methods mainly include ammonium persulfate method, formaldehyde oxime method and PAN method, etc., which can effectively detect the total manganese content in water, but the detection cycle is long, which is not convenient for real-time detection in water production. Instrument detection methods such as atomic absorption spectrometry have relatively expensive analytical equipment and require high quality personnel. Therefore, it is of great economic, social and practical significance to design a utility model that is simple to operate and can quickly determine the content of Mn(II) in water samples.

Utility model content

The purpose of this utility model is to provide a semi-quantitative on-line detection device and detection method of Mn(II) content in a water body with simple structure and reasonable design in order to solve the above problems.

The utility model realizes above-mentioned purpose through following technical scheme:

A semi-quantitative on-line detection device for Mn(II) content in water bodies, the device includes a detection unit, a sampling unit, a dosing unit, a color recognition unit, a sample discarding unit, a detection result output unit and a control unit.

The detection unit includes a plurality of transparent plexiglass square dishes arranged in sequence in the transverse direction.

The sampling unit includes a plurality of water inlet peristaltic pumps. The water inlet ends of the water inlet peristaltic pumps are all connected to the external water body to be tested, and the water outlet ends are respectively connected to various types of dishes.

The dosing unit includes a plurality of dosing peristaltic pumps and potassium permanganate liquid storage tanks. The inlet ends of the dosing peristaltic pumps are connected to the potassium permanganate liquid storage tanks, and the outlet ends are respectively connected to various types of containers. .

The color recognition unit includes a plurality of color sensors, a plurality of chromogenic agent dosing peristaltic pumps, and a chromogenic agent liquid storage tank. The color sensors are respectively placed outside each square dish to detect the color of the water body in the square dish. The inlet ports of the color developer dosing peristaltic pump are connected to the color developer liquid storage tank, and the outlet ports are respectively connected to various types of dishes.

The sample discarding unit includes a plurality of drainage peristaltic pumps. The water inlets of the drainage peristaltic pumps are respectively connected to the various square dishes, and the water outlets are connected to the drainage pipes to perform emptying operations.

The detection result output unit includes an audible and visual alarm module.

The control unit includes a programmable logic controller (PLC), and the output ports of the PLC are respectively connected with the water inlet peristaltic pump, the dosing peristaltic pump, the chromogenic agent dosing peristaltic pump, the color sensor, the drainage peristaltic pump and the sound and light alarm module. The control terminal is connected, and the input port is connected with the output port of the color sensor.

As a further optimization scheme of the present invention, the volume of the square dishes is greater than 1L, and each of the square dishes is equipped with a stirring pump, and the control end of the stirring pump is connected to the output port of the PLC.

By adopting the above technical scheme, it is ensured that 1L of water sample can be loaded in the square dish, and the reaction rate in the square dish can be improved by stirring.

Further, the sound and light alarm module is equipped with a buzzer, an indicator light marked "excessive", an indicator light marked "suitable", and several indicator lights marked "insufficient X", where X is a number, such as 1, 2, etc.

By adopting the above technical scheme, the semi-quantitative detection result of the Mn(II) content in the water sample to be tested can be output.

Further, the model of the controller is S7-200, and the color sensor (6) adopts TCS230 of TAOS Company.

The principle of the utility model is:

After adding potassium permanganate to the water in the usual production process, potassium permanganate will preferentially oxidize Mn(II) in the water, because the reaction speed of potassium permanganate to oxidize Mn(II) in the water is much faster It oxidizes other reducing substances faster than it. If there is residual potassium permanganate in the water after the reaction is complete, the water will appear reddish.

The on-line detection device involved in the utility model is just based on the above discussion. When detecting, the water sample to be tested is first divided into several equal parts, and different amounts of potassium permanganate are added to carry out the oxidation reaction with Mn(II) in the water body. Then add a color developer to each water sample to enhance the color development effect, so that the color sensor can detect, and then use the PLC to compare the color detection value of each water sample with the preset threshold range, if the detection value is in If it is within the threshold range, it indicates that the water sample contains residual potassium permanganate; if the detection value is outside the threshold range, it indicates that the water sample does not contain residual potassium permanganate, and then according to the pre-set judgment rules , the semi-quantitative detection result of the Mn(II) content in the water sample to be tested can be obtained, and finally the semi-quantitative detection result is output through the sound and light alarm module, so that the production can adjust the production parameters of the manganese removal process section in time.

Generally, the oxidation reaction between potassium permanganate and Mn(II) can be completed within 2 minutes, so the online detection device involved in the utility model can complete the rapid semi-quantitative detection of a water sample to be tested within 10 minutes.

The beneficial effects of the utility model are:

(1) The on-line detection device involved in the utility model can directly perform rapid semi-quantitative detection on the Mn(II) content in the water body.

(2) The on-line detection device involved in the utility model can complete the semi-quantitative detection of Mn(II) content in a water sample to be tested within 10 minutes, compared with the traditional spectrophotometric detection method, the detection time is greatly shortened, so Online real-time detection can be carried out in water production, and the device includes an acousto-optic alarm module to ensure timely reminders to adjust the production parameters of the manganese removal process section in production.

(3) The online detection device involved in the utility model utilizes the color sensor to detect the color of the water sample, utilizes the PLC to control the detection process and perform data processing, and utilizes the semi-quantitative detection results obtained by the output of the sound and light alarm module, thereby realizing the detection of the whole process. automation.

(4) The online detection device involved in the utility model has simple structure and high stability, and is suitable for popularization and application in grass-roots water plants.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Fig. 2 is a schematic diagram of the relationship between each unit of the utility model.

Fig. 3 is a schematic diagram of circuit connection of the utility model.

In the figure: 1. Dosing peristaltic pump; 2. Inlet peristaltic pump; 3. Drainage peristaltic pump; 4. Chromogen dosing peristaltic pump; 5. Stirring pump; 6. Color sensor.

Detailed ways

The utility model is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific embodiments are only used to further illustrate the utility model, and cannot be interpreted as limiting the scope of protection of the utility model. Personnel can make some non-essential improvements and adjustments to the utility model according to the above application content.

Example 1

As shown in Figures 1 to 3, a semi-quantitative on-line detection device for Mn(II) content in water bodies, the device includes a detection unit, a sampling unit, a dosing unit, a color recognition unit, a sample discarding unit, and a detection result output unit and control unit.

The detection unit includes three transparent plexiglass square dishes arranged in sequence in the transverse direction and each equipped with a stirring pump 5 .

The sampling unit includes three water-inlet peristaltic pumps 2, the water-inlet ends of which are connected to the external water body to be measured, and the water-outlet ends are respectively connected to various types of dishes.

The dosing unit includes three dosing peristaltic pumps 1 and a potassium permanganate liquid storage tank. The inlet ends of the dosing peristaltic pumps 1 are connected to the potassium permanganate liquid storage tanks, and the outlet ends are respectively connected to all parties. Type dish.

The color recognition unit includes three color sensors 6 (TCS230 from TAOS Company), three chromogenic agent dosing peristaltic pumps 4 and a chromogenic agent liquid storage tank, and the color sensors 6 are placed on the outside of each type of dish respectively. For detecting the color of the water body in the square dish, the inlet ports of the color developer dosing peristaltic pump 4 are all connected to the color developer liquid storage tank, and the outlet ports are respectively connected to various types of dishes.

The sample discarding unit includes three draining peristaltic pumps 3, the water inlets of which are respectively connected to various types of dishes, and the water outlets are all connected to drain pipes, which can perform emptying operations.

The detection result output unit includes an audible and visual alarm module, equipped with four indicator lights and a buzzer, and the four indicator lights are respectively marked as "excessive", "suitable", "less than 1" and "less than 2".

The control unit includes a programmable logic controller (S7-200 type PLC), and its output ports are respectively connected with the water inlet peristaltic pump 2, the stirring pump 5, the dosing peristaltic pump 1, the color developer dosing peristaltic pump 4, the color sensor 6. The drainage peristaltic pump 3 is connected to the control end of the sound and light alarm module, and the input port is connected to the output port of the color sensor 6 .

The usage method of this device will be further described in detail in conjunction with specific examples below:

(1) Set the concentration of potassium permanganate solution in the dosing unit to 1g/L.

(2) Set the developer as DPD solution with a concentration of 1 g/L.

(3) choosing concentration is the potassium permanganate solution of 0.1mg/L, after adding chromogenic agent DPD solution, utilize described color sensor TCS230 to measure its ESL value, the ESL value that the present embodiment measures is respectively 221,94, 183, according to which the threshold range is set as E≥210 and S≥90 and L≤220. When the color detection value is within the above threshold range, it indicates that the water contains residual potassium permanganate, and when the color detection value is outside the above threshold range, it indicates that the water does not contain residual potassium permanganate. It is not difficult to understand that the above threshold range can be properly adjusted under different detection environments.

(4) When the "excessive" indicator light of the sound and light alarm module is on and accompanied by an alarm sound, it means that the potassium permanganate dosage in the manganese removal process section is excessive; when the "appropriate" indicator of the sound and light alarm module When the light is on, it means that the dosage of potassium permanganate in the process section of manganese removal is appropriate; The dosage of potassium permanganate has different degrees of deficiency.

Specific detection steps:

(1) Start the water inlet peristaltic pump 2, and add 1L of the same water sample to be tested into each of the three square dishes;

(2) Start the dosing peristaltic pump 1, and add 0, 0.1ml, and 0.2ml of potassium permanganate solution (1g/L) to three square dishes (respectively named No. 1, No. 2, and No. 3) respectively. ;

(3) start each stirring pump 5, stirring and reacting for 2 minutes;

(4) After the reaction is over, start the chromogenic agent and add the peristaltic pump 4, and add 2ml of DPD solution (1g/L) to each of the three square dishes. After an interval of 30 seconds, the PLC controls to close each stirring pump 5;

(5) After standing still for 1 minute, start the color sensor 6 to detect the color of the water body in the three square dishes, and the semi-quantitative detection result obtained by the sound and light alarm module output;

Table 1. Judgment rules

Note: "+" indicates that the detection value is within the threshold range, and "-" indicates that the detection value is outside the threshold range.

(6) Start the drainage peristaltic pump 3 to empty the water samples tested in the three square dishes.

The above online detection device can complete the semi-quantitative detection of Mn(II) content in a water sample to be tested within 10 minutes, and its detection speed is much faster than the traditional spectrophotometric detection method.

In order to further verify the practicability of the above-mentioned online detection device, a productive application test was carried out on the outlet water samples of the sedimentation tank of the water plant. The specific test data are shown in the following table:

Table 2. Production application test data

Comparing the detection results of the online detection device with the total manganese content determined by inductively coupled plasma atomic emission spectrometry (ICP method), it should be noted that the Mn(IV) suspension can often be completely precipitated in the sedimentation tank, and the precipitation Generally only soluble Mn(II) exists in the outlet water of the pool, so the total manganese content measured by ICP method can be used for comparison, and the detection results of the two are found to be consistent, indicating that the above-mentioned online detection device has good practicability and can be used in In the actual water production, the content of Mn(II) in the water can be quickly and semi-quantitatively determined, and the production parameters of the manganese removal process can be adjusted in time through the sound and light alarm signal.

The above-mentioned embodiment only expresses one implementation mode of the utility model, and its description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (4)

1. the sxemiquantitative on-line measuring device of Mn (II) content in a kind of water body, it is characterised in that: described device includes that detection is single Member, sample injection unit add unit, color recognition unit, abandon sample unit, testing result output unit and control unit;

The detection unit includes multiple transparent organic glass square wares being laterally arranged successively;

The sample injection unit includes multiple water inlet peristaltic pumps (2), and the water inlet end of water inlet peristaltic pump (2) connects with external water body to be measured It connects, water outlet is then respectively connected in each square ware;

The unit that adds includes multiple dosing peristaltic pumps (1), potassium permanganate fluid reservoir, and the input end of dosing peristaltic pump (1) is equal It is connected to potassium permanganate fluid reservoir, outlet end is then respectively connected in each square ware;

The color recognition unit includes that multiple color sensors (6), multiple color developing agents add peristaltic pump (4), color developing agent liquid storage Tank, color sensor (6) are respectively placed on the outside of each square ware, and for detecting the color of water body in square ware, color developing agent is added The input end of peristaltic pump (4) is connected to color developing agent fluid reservoir, and outlet end is then respectively connected in each square ware;

The abandoning sample unit includes multiple draining peristaltic pumps (3), and the water inlet end for draining peristaltic pump (3) connects with each square ware respectively Logical, water outlet is connected to drainpipe, and emptying operation can be performed;

The testing result output unit includes sound and light alarm module;

Described control unit includes programmable logic controller (PLC) (PLC), the output port of PLC respectively with water inlet peristaltic pump (2) plus Medicine peristaltic pump (1), color developing agent add peristaltic pump (4), color sensor (6), the control for draining peristaltic pump (3) and sound and light alarm module End connection processed, input port are connect with the output port of color sensor (6).

2. the sxemiquantitative on-line measuring device of Mn (II) content in a kind of water body according to claim 1, it is characterised in that: The square ware volume is all larger than 1L, and is configured with mixing pump (5) in each square ware, and the control terminal and PLC of mixing pump (5) are defeated Exit port connection.

3. the sxemiquantitative on-line measuring device of Mn (II) content in a kind of water body according to claim 1, it is characterised in that: The sound and light alarm module configured with buzzer, labeled as " excess " indicator light, labeled as " suitable " if indicator light and Dry label is the indicator light less than X ".

4. the sxemiquantitative on-line measuring device of Mn (II) content in a kind of water body according to claim 1, it is characterised in that: The controller model S7-200, the color sensor (6) use the TCS230 of TAOS company.