A water quality measuring device

Abstract

This utility model relates to a water quality measuring device, which includes a diaphragm pump, a flow meter, a first pressure sensor, a second pressure sensor, a splitter, an outlet valve assembly, and a filter membrane. The inlet of the diaphragm pump is connected to an inlet pipe; the outlet of the diaphragm pump is connected to the inlet of the splitter via a flow meter pipe; the first pressure sensor is connected to the pipe between the flow meter and the splitter; the first outlet pipe of the splitter is connected to the inlet of the filter membrane; the outlet of the filter membrane and the second outlet of the splitter are both connected to the outside of the water quality measuring device via outlet valve assembly pipes; the second pressure sensor is connected to the pipe between the filter membrane and the outlet valve assembly. This utility model can reliably and accurately measure the membrane fouling index (SDI) and the membrane fouling correction index (MFI).

Description

Technical Field

[0001] This utility model relates to the field of water quality measurement technology, and in particular to a water quality measurement device. Background Technology

[0002] Membrane separation technology can efficiently remove various impurities from water and is widely used in pure water preparation, industrial wastewater treatment, and other fields. However, membrane separation technology also faces the problem of membrane fouling, which directly affects the economic cost, service life, and filtration efficiency of the technology. Therefore, rapid and accurate measurement of the fouling potential of the feed membrane is crucial for effective control of membrane fouling. The Sulfation Index (SDI) and the Modified Fouling Index (MFI) are currently the most commonly used fouling indices.

[0003] Currently, traditional membrane fouling index (SDI) and membrane fouling correction index (MFI) require manual operation, which has a large margin of error. In addition, it requires manual adjustment of constant pressure, and pressure deviation can easily cause data distortion. Utility Model Content

[0004] The purpose of this invention is to provide a water quality measuring device that can reliably and accurately measure the membrane fouling index (SDI) and the membrane fouling correction index (MFI).

[0005] To achieve the above objectives, this utility model discloses a water quality measuring device, which includes a diaphragm pump, a flow meter, a first pressure sensor, a second pressure sensor, a splitter, an outlet valve assembly, and a filter membrane. The inlet of the diaphragm pump is connected to an inlet pipe; the outlet of the diaphragm pump is connected to the inlet of the splitter via a flow meter pipe; the first pressure sensor is connected to the pipe between the flow meter and the splitter; the first outlet pipe of the splitter is connected to the inlet of the filter membrane; the outlet of the filter membrane and the second outlet of the splitter are both connected to the outside of the water quality measuring device via outlet valve assembly pipes; the second pressure sensor is connected to the pipe between the filter membrane and the outlet valve assembly.

[0006] Preferably, the outlet valve assembly is a three-way electric valve, the outlet pipe of the filter membrane is connected to one of the inlets of the three-way electric valve, and the second outlet pipe of the splitter is connected to the other inlet of the three-way electric valve; or, the outlet valve assembly includes two independently configured valves, namely a first valve and a second valve, the outlet pipe of the filter membrane is connected to the first valve, and the second outlet pipe of the splitter is connected to the second valve.

[0007] Preferably, the three-way electric valve is a two-position three-way valve, the normally open end of the two-position three-way valve is connected to the second outlet of the splitter, the normally closed end of the two-position three-way valve is connected to the outlet of the filter membrane, and the common end of the two-position three-way valve is connected to the outside of the water quality measuring equipment.

[0008] Preferably, the distributor is a pipeline diverter; or, the distributor is a two-position three-way valve, the common end of which is connected to a flow meter, the normally open end of which is connected to an outlet valve assembly, and the normally closed end of which is connected to the inlet of the filter membrane.

[0009] Preferably, the system further includes a first tee and a second tee, wherein the first pressure sensor is connected to the pipe between the flow meter and the splitter via the first tee, and the second pressure sensor is connected to the pipe between the filter membrane and the outlet valve assembly via the second tee.

[0010] Preferably, it also includes a third tee and a water level switch, wherein the water level switch is connected to the first port of the third tee, the second port of the third tee is connected to the outlet of the diaphragm pump, and the third port of the third tee is connected to a flow meter.

[0011] Preferably, it also includes a pipe damper connected in series between the diaphragm pump and the flow meter.

[0012] Preferably, it also includes a pulse counter electrically connected to the flow meter.

[0013] Preferably, the system also includes a controller electrically connected to the diaphragm pump, flow meter, first pressure sensor, second pressure sensor, splitter, and outlet valve assembly.

[0014] This utility model has the following beneficial effects: 1. This invention uses a splitter to control whether water samples are fed to the filter membrane. Before the formal test, the water sample flows sequentially through the diaphragm pump, flow meter, splitter, and outlet valve assembly to rinse the front end of the filter membrane. The rinsed water sample is then directly discharged and not used in the measurement, thus ensuring the accuracy of the test results. After rinsing, the water sample flows sequentially through the diaphragm pump, flow meter, splitter, filter membrane, and outlet valve assembly. Initially, the diaphragm pump operates at low power to ensure the filter membrane is fully wetted, preventing subsequent air impact that could damage the membrane and cause data deviation. The power of the diaphragm pump is then adjusted by comparing the difference between the first and second pressure sensors to achieve constant pressure control. After achieving constant pressure, the membrane fouling index (SDI) and membrane fouling correction index (MFI) are measured to ensure the accuracy and reliability of the measurement data.

[0015] 2. By setting a water level switch, it is possible to detect whether there is water in the pipeline and to detect the saturation of the water in the pipeline, that is, to detect whether the water fills the pipeline, thereby ensuring the accuracy of the measurement data.

[0016] 3. By setting a controller, automatic control of the pressure difference across the membrane can be achieved. Specifically, the controller compares the pressure feedback from the first and second pressure sensors to control the output power of the diaphragm pump. Additionally, it allows for better collection of time and flow data, enabling the plotting of curves. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the present invention.

[0018] Explanation of symbols for main components: 1. Diaphragm pump, 2. Flow meter, 3. First pressure sensor, 4. Second pressure sensor, 5. Diverter, 6. Outlet valve assembly, 7. Filter membrane, 8. First tee, 9. Second tee, 10. Third tee, 11. Water level switch, 12. Pipeline damper, 13. Pulse counter. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, this utility model discloses a water quality measuring device, which includes a diaphragm pump 1, a flow meter 2, a first pressure sensor 3, a second pressure sensor 4, a splitter 5, an outlet valve assembly 6, a filter membrane 7, a first tee 8, a second tee 9, a third tee 10, a water level switch 11, a pipe damper 12, a pulse counter 13, and a controller. The inlet of the diaphragm pump 1 is connected to an inlet pipe, which is used to supply water samples. The outlet pipe of the diaphragm pump 1 is connected to the inlet of the pipe damper 12, and the outlet pipe of the pipe damper 12 is connected to the second port of the third tee 10. The pipe damper 12 (also called a flow damper 12) is designed to eliminate pipeline pressure pulsations to maintain pressure stability.

[0021] The water level switch 11 is connected to the first port of the third tee 10 to detect whether there is water in the pipeline and to determine whether the pipeline is full. The third port of the third tee 10 is connected to the inlet of the flow meter 2, and the outlet of the flow meter 2 is connected to the first port of the first tee 8. The flow meter 2 is electrically connected to the pulse counter 13 to collect real-time flow rate and volume.

[0022] The first pressure sensor 3 is connected to the second port of the first tee 8, and the third port of the first tee 8 is connected to the splitter 5. The first pressure sensor 3 is used to detect the pressure in front of the membrane.

[0023] The splitter 5 has an inlet, a first outlet, and a second outlet. The third port of the first tee 8 is connected to the inlet of the splitter 5. The first outlet of the splitter 5 is connected to the inlet of the filter membrane 7, and the second outlet of the splitter 5 is connected to the outlet valve assembly 6. The splitter 5 can be a pipe diverter (i.e., the first and second outlets are equipped with independent switches, and the on / off control of the first and second outlets is independent of each other). Alternatively, the splitter 5 uses a two-position three-way valve. The common end of the two-position three-way valve is the inlet of the splitter 5, the second outlet of the two-position three-way valve is the second outlet of the splitter 5, and the normally closed end of the two-position three-way valve is the first outlet of the splitter 5. The splitter 5 is used to select whether to supply water samples to the filter membrane 7.

[0024] The outlet pipe of the filter membrane 7 is connected to the first port of the second tee 9, the second port of the second tee 9 is connected to the outlet valve assembly 6, and the second pressure sensor 4 is connected to the third port of the second tee 9 to detect the pressure after the membrane.

[0025] The outlet valve assembly 6 can be a three-way electric valve, preferably a two-position three-way valve. Specifically, the normally open end of the two-position three-way valve (i.e., one inlet of the three-way electric valve) is connected to the second outlet of the distributor 5, and the normally closed end of the two-position three-way valve (i.e., the other inlet of the three-way electric valve) is connected to the outlet of the filter membrane 7. The common end of the two-position three-way valve (i.e., the outlet of the three-way electric valve) is piped to the outside of the water quality measuring equipment. As an alternative, the outlet valve assembly 6 includes two independently configured valves, namely a first valve and a second valve. The outlet pipe of the filter membrane 7 is connected to the inlet of the first valve, and the second outlet pipe of the distributor 5 is connected to the inlet of the second valve. The outlets of both the first valve and the second valve are connected to the outside of the water quality measuring equipment through pipes.

[0026] The controller is electrically connected to the diaphragm pump 1, pulse counter 13, first pressure sensor 3, second pressure sensor 4, splitter 5, and outlet valve assembly 6. In this case, the flow meter 2 is effectively connected to the controller through the pulse counter 13. Of course, the pulse counter 13 can also be disabled, in which case the controller is directly connected to the flow meter 2.

[0027] The method of using this utility model is as follows: 1. Rinsing: Turn on diaphragm pump 1 and adjust its power to 50%. Pump water through diaphragm pump 1, pipe damper 12, third tee 10 (water level switch 11), flow meter 2, first tee 8 (first pressure sensor 3), distributor 5 (second outlet), three-way electric valve, and the outlet of the water quality measuring equipment. This rinsing process removes internal air, and the presence of water is checked using water level switch 11.

[0028] 2. Wetting the filter membrane 7: Open the electric three-way valve and adjust the power of the diaphragm pump 1 to 20%. Slowly pump water from the distributor 5 (first outlet) through the filter membrane 7, the second three-way valve 9 (second pressure sensor 4), the electric three-way valve, and the outlet of the water quality measuring equipment. This is to fully wet the filter membrane and prevent subsequent air impact from damaging the filter membrane and causing data deviation.

[0029] 3. Constant pressure: By collecting and calculating the pressure difference fed back by the first pressure sensor 3 and the second pressure sensor 4 in real time, the output power of the diaphragm pump 1 is adjusted so that the pressure difference across the membrane is kept constant within a set range, such as 0.207 kPa ± 1%.

[0030] 4. After constant pressure is achieved, the following steps are performed simultaneously: SDI measurement: ① Calculate t0: After constant pressure, calculate the volume L1 collected through flow meter 2. When L1 is 500mL, record the collection time t0. ② After running for 5 minutes, calculate t5: Collect the volume L2 passing through flow meter 2 again. When L2 is 500 mL, record the collection time t5; calculate the result of SDI5 according to the following formula:

[0031] ③ After running for 10 minutes, calculate t10: Collect the volume L3 passing through flow meter 2 again. When L3 is 500 mL, record the collection time t10; calculate SDI according to the following formula. 10 The result is:

[0032] ④ After running for 15 minutes, calculate t15: Collect the volume L4 passing through flow meter 2 again. When L4 is 500 mL, record the collection time t15; calculate SDI according to the following formula. 15 The result is:

[0033] MFI measurement: ①The vertical axis is the volume V (liters) that the flow meter 2 passes through multiplied by the real-time acquisition time t (seconds), and the horizontal axis is the volume V (liters) that the flow meter 2 passes through in real time.

[0034] ②The instrument automatically records the above data and plots it as a curve every minute.

[0035] ③ During the 15th to 20th minute of the curve, the system automatically performs a linear fit and calculates the slope (tanα), which is the MFI.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A water quality measuring apparatus characterized by comprising: The device includes a diaphragm pump, a flow meter, a first pressure sensor, a second pressure sensor, a distributor, an outlet valve assembly, and a filter membrane. The inlet of the diaphragm pump is connected to an inlet pipe; the outlet of the diaphragm pump is connected to the inlet of the distributor via a flow meter pipe; the first pressure sensor is connected to the pipe between the flow meter and the distributor; the first outlet pipe of the distributor is connected to the inlet of the filter membrane; the outlet of the filter membrane and the second outlet of the distributor are both connected to the outside of the water quality measuring equipment via an outlet valve assembly pipe; the second pressure sensor is connected to the pipe between the filter membrane and the outlet valve assembly.

2. The water quality measuring apparatus according to claim 1, characterized by: The outlet valve assembly is a three-way electric valve, with the outlet pipe of the filter membrane connected to one of the inlets of the three-way electric valve, and the second outlet pipe of the splitter connected to the other inlet of the three-way electric valve; or, the outlet valve assembly includes two independently configured valves, namely a first valve and a second valve, with the outlet pipe of the filter membrane connected to the first valve, and the second outlet pipe of the splitter connected to the second valve.

3. The water quality measuring apparatus according to claim 2, characterized by: The three-way electric valve is a two-position three-way valve. The normally open end of the two-position three-way valve is connected to the second outlet of the distributor, the normally closed end of the two-position three-way valve is connected to the outlet of the filter membrane, and the common end of the two-position three-way valve is connected to the outside of the water quality measuring equipment.

4. The water quality measuring apparatus according to claim 1, characterized by: The splitter is a pipeline splitter; or, the splitter is a two-position three-way valve, the common end of which is connected to a flow meter, the normally open end of which is connected to an outlet valve assembly, and the normally closed end of which is connected to the inlet of a filter membrane.

5. The water quality measuring apparatus according to claim 1, characterized by: It also includes a first tee and a second tee, wherein the first pressure sensor is connected to the pipe between the flow meter and the splitter via the first tee, and the second pressure sensor is connected to the pipe between the filter membrane and the outlet valve assembly via the second tee.

6. The water quality measuring apparatus according to claim 1, characterized by: It also includes a third tee and a water level switch, wherein the water level switch is connected to the first port of the third tee, the second port of the third tee is connected to the outlet of the diaphragm pump, and the third port of the third tee is connected to a flow meter.

7. The water quality measuring apparatus according to claim 1, characterized by: It also includes a pipe damper connected in series between the diaphragm pump and the flow meter.

8. The water quality measuring apparatus according to claim 1, characterized by: It also includes a pulse counter electrically connected to the flow meter.

9. The water quality measuring apparatus according to claim 1, characterized by: It also includes a controller that is electrically connected to the diaphragm pump, flow meter, first pressure sensor, second pressure sensor, splitter and outlet valve assembly.

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