Device for detecting chemical oxygen demand of sewage

Abstract

The utility model provides a sewage chemical oxygen demand detection device which comprises a dechlorination module, a mixed reaction module and a detection module, the dechlorination module comprises a chloride ion reactor used for removing chloride ions in a sample, and the mixed reaction module comprises a first liquid storage part, a second liquid storage part, a third liquid storage part and a mixer, the first liquid storage part is connected with the chloride ion reactor, the second liquid storage part is connected with the oxidizing agent supply device, the third liquid storage part is connected with the catalyst supply device, the first liquid storage part, the second liquid storage part and the third liquid storage part are all connected with the mixer, and a preset amount of sample, oxidizing agent and catalyst are respectively conveyed to the mixer for mixing within the same time; the mixed reaction module further comprises a reaction tube, one end of the reaction tube is connected with the mixer, the detection module comprises a batcher, a detector and a six-way valve, the first end of the six-way valve is communicated with the reaction tube, the second end of the six-way valve is communicated with one end of the batcher, the third end of the six-way valve is communicated with the other end of the batcher, and the fourth end of the six-way valve is communicated with the detector.

Description

Technical Field

[0001] The utility model belongs to the technical field of water quality detection, in particular to a detection device for chemical oxygen demand of sewage. Background Art

[0002] At present, chemical oxygen demand (COD) is a chemical method that measures the amount of reducing substances that need to be oxidized in water samples. It directly reflects the water quality and environmental pollution status. The higher the COD, the more serious the water pollution. In the detection of COD in water samples, excessive chloride ion content will affect the measurement results. The existing technology is to eliminate the interference of chloride ions by adding masking agents, but adding too much or too little masking agent will also affect the measurement results and cause a certain degree of pollution to the water sample. In addition, the existing technology requires that the sample, oxidant, catalyst and masking agent be manually mixed in a certain proportion, and then the reaction detection is carried out after mixing. The operation is complicated, the steps are cumbersome, and it takes a long time.

[0003] In order to solve the above technical problems, the utility model designs a detection device for the chemical oxygen demand of sewage. Utility Model Content

[0004] The utility model provides a detection device for chemical oxygen demand of sewage, aiming to solve the problems of chloride ion interference and complicated and time-consuming operation.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A device for detecting the chemical oxygen demand of sewage, comprising a dechlorination module, a mixing reaction module and a detection module, wherein the dechlorination module comprises a chloride ion reactor for removing chloride ions from a sample, the mixing reaction module comprises a first liquid storage part, a second liquid storage part, a third liquid storage part and a mixer, the first liquid storage part is connected to the chloride ion reactor, the second liquid storage part is connected to an oxidant supplier, and the third liquid storage part is connected to a catalyst supplier, the first liquid storage part, the second liquid storage part and the third liquid storage part are all connected to the mixer, and preset amounts of sample, oxidant and catalyst are respectively transported to the mixer for mixing at the same time, the mixing reaction module also comprises a reaction tube, one end of the reaction tube is connected to the mixer, the detection module comprises a doser, a detector and a six-way valve, the first end of the six-way valve is connected to the reaction tube, the second end is connected to one end of the doser, the third end is connected to the other end of the doser, and the fourth end is connected to the detector.

[0006] Based on the above technical solution, the detection module further includes a washing liquid supplier, the fifth end of the six-way valve is connected to the washing liquid supplier, and the sixth end is connected to the waste drain tank.

[0007] Based on the above technical solution, the quantifier is a quantitative loop anion chromatography column or a quantitative loop cation chromatography column, and the eluent supplier provides an anion eluent or a cationic eluent.

[0008] Based on the above technical solution, the first liquid storage part, the second liquid storage part and the third liquid storage part all include a first injection pump, an injection valve and a cache tube. The first injection pump is connected to the injection valve. The injection valve includes an inlet and an outlet. The inlet is connected to the pure water supplier, and the outlet is connected to the cache tube. The first injection pump can drive the pure water in the pure water supplier into the cache tube through the injection valve and fill the cache tube.

[0009] Based on the above technical solution, the first liquid storage part also includes a first four-way valve, the first end of the first four-way valve is connected to the cache tube, the second end is connected to the chloride ion reactor, the third end is connected to the mixer, and the fourth end is connected to the waste tank, wherein the first end can be connected to the second end, the third end or the fourth end respectively.

[0010] Based on the above technical solution, the second liquid storage part also includes a second four-way valve, the first end of the second four-way valve is connected to the cache tube, the second end is connected to the oxidant supplier, the third end is connected to the mixer, and the fourth end is connected to the waste tank, wherein the first end can be connected to the second end, the third end or the fourth end respectively.

[0011] Based on the above technical solution, the third liquid storage part also includes a third four-way valve, the first end of the third four-way valve is connected to the cache tube, the second end is connected to the catalyst supplier, the third end is connected to the mixer, and the fourth end is connected to the waste tank, wherein the first end can be connected to the second end, the third end or the fourth end respectively.

[0012] Based on the above technical solution, the mixing reaction module also includes a waste valve, which is arranged between the mixer and the reaction tube and is used to discharge waste liquid between the first four-way valve, the second four-way valve, the third four-way valve and the mixer.

[0013] Based on the above technical solution, the mixer is provided with a second injection pump for driving air into the mixer to push the mixed liquid into the reaction tube.

[0014] Based on the above technical solution, the reaction tube is provided with a heating element and a cooling element for heating and cooling the reaction tube.

[0015] Compared with the related art, the beneficial effects of the present invention are as follows:

[0016] 1. The present invention removes chloride ions from the sample in advance before adding the oxidant and catalyst by setting up a chloride ion reactor in the chlorine removal module, thereby preventing chloride ions from affecting the determination results of the chemical oxygen demand in the sample. Compared with the prior art, it can avoid the subsequent influence of the masking agent on the determination results.

[0017] 2. The present invention provides a mixing reaction module to first store a certain amount of dechlorinated sample, oxidant, and catalyst in the first, second, and third liquid storage parts, respectively. Then, a preset amount of dechlorinated sample, oxidant, and catalyst is transported to the mixer for mixing at the same time. After mixing, the sample reacts through the reaction tube. Finally, the sample is quantified by the dosing device of the six-way valve in the detection module and then enters the detector for detection to calculate the chemical oxygen demand in the sample. Compared with the prior art, the setting of the mixing reaction module simplifies the configuration process of the mixed solution and shortens the preparation time before the reaction of the mixed solution. The connection between the mixing reaction module and the detection module makes the entire detection process more continuous, which can improve the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only one embodiment of the present invention. For those skilled in the art, other implementation drawings can be derived from the provided drawings without inventive effort.

[0019] Figure 1 This is a schematic structural diagram of a device for detecting chemical oxygen demand of sewage provided by the utility model;

[0020] Figure 2 It is a structural schematic diagram of another device for detecting chemical oxygen demand of sewage provided by the utility model.

[0021] In the figure: 1. Chlorine removal module; 11. Chloride ion reactor; 2. Mixing reaction module; 21. First liquid storage part; 211. First injection pump; 212. Injection valve; 2121. Inlet; 2122. Outlet; 213. Buffer tube; 214. Pure water supplier; 215. First four-way valve; 22. Second liquid storage part; 221. Second four-way valve; 23. Third liquid storage part; 231. Third four-way valve; 24. Oxidant supplier; 25. Catalyst supplier; 26. Mixer; 261. Second injection pump; 27. Reaction tube; 271. Heating element; 272. Cooling element; 28. Waste drain tank; 3. Detection module; 31. Doser; 32. Detector; 33. Six-way valve; 34. Eluent supplier. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and examples:

[0023] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0024] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0025] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] Combine Figure 1 As shown, the embodiment of the present disclosure provides a detection device for chemical oxygen demand of sewage, including a dechlorination module 1, a mixing reaction module 2 and a detection module 3, wherein the dechlorination module 1 includes a chloride ion reactor 11 for removing chloride ions in a sample, and the mixing reaction module 2 includes a first liquid storage part 21, a second liquid storage part 22, a third liquid storage part 23 and a mixer 26, wherein the first liquid storage part 21 is connected to the chloride ion reactor 11, the second liquid storage part 22 is connected to the oxidant supplier 24, and the third liquid storage part 23 is connected to the catalyst supplier 25. The second liquid storage part 22 and the third liquid storage part 23 are both connected to the mixer 26, and preset amounts of sample, oxidant and catalyst are respectively delivered to the mixer 26 for mixing at the same time. The mixed reaction module 2 also includes a reaction tube 27, one end of which is connected to the mixer 26. The detection module 3 includes a doser 31, a detector 32 and a six-way valve 33. The first end of the six-way valve 33 is connected to the reaction tube 27, the second end is connected to one end of the doser 31, the third end is connected to the other end of the doser 31, and the fourth end is connected to the detector 32.

[0027] The detection device of the chemical oxygen demand of sewage provided by the embodiment of the present disclosure is used. By setting the chloride ion reactor 11 of the dechlorination module 1 to remove the chloride ions in the sample in advance, the chloride ions are avoided from affecting the measurement results of the chemical oxygen demand in the sample. Compared with the prior art, the subsequent influence of the masking agent on the measurement results can be avoided. By setting the mixed reaction module 2, a certain amount of dechlorinated sample, oxidant and catalyst are first stored in the first liquid storage part 21, the second liquid storage part 22 and the third liquid storage part 23 respectively, and then the dechlorinated sample, oxidant and catalyst of a preset amount are transported to the mixer 26 for mixing within the same time. After mixing, the reaction is carried out through the reaction tube 27, and finally, the quantitative device 31 of the six-way valve 33 in the detection module 3 is quantitatively entered into the detector 32 for detection, and the chemical oxygen demand in the sample is calculated. The setting of the mixed reaction module 2 simplifies the configuration process of the mixed solution compared to the prior art, shortens the preparation time before the reaction of the mixed solution, and the mixed reaction module 2 is connected to the detection module 3, so that the whole detection process is more continuous, which can improve the detection efficiency.

[0028] Based on the above technical solution, the detection module 3 further includes a washing liquid supplier 34 , the fifth end of the six-way valve 33 is connected to the washing liquid supplier 34 , and the sixth end is connected to the waste drain 28 .

[0029] The solution after the reaction in the reaction tube 27 enters the dosing device 31 of the six-way valve 33. Under the elution of the eluent supplied by the eluent supplier 34, the solution enters the detector 32 from the dosing device 31 for subsequent detection, and the waste liquid enters the waste tank 28 from the sixth end.

[0030] Based on the above technical solution, the quantitative device 31 is a quantitative loop anion chromatography column or a quantitative loop cation chromatography column, and the eluent supplier 34 provides an anion eluent or a cation eluent.

[0031] Specifically, the quantifier 31 can be a quantitative ring type anion and cation chromatographic column, which quantifies the solution to be detected through the quantitative ring, and the capacity is the sample capacity required by the detector 32. The anion and cation chromatographic column is flushed with the eluent of the eluent supplier 34. The eluent at this time is pure water, so that the solution to be detected enters the detector 32 for detection.

[0032] It can be understood that when the quantifier 31 is an anion chromatography column, the eluent in the eluent supplier 34 is an anion eluent, which is convenient for flushing the anions in the anion chromatography column and entering the detector 32. When the quantifier 31 is a cation chromatography column, the eluent in the eluent supplier 34 is a cation eluent, which is convenient for flushing the cations in the cation chromatography column and entering the detector 32.

[0033] Specifically, the oxidizing agent is generally potassium dichromate. The reducing substances in the sample will reduce dichromate to trivalent chromium ions. Therefore, after the sample passes through the reaction tube 27 and reacts, it contains both dichromate and chromium ions. The detection module 3 can detect the reduction of dichromate and the generation of chromium ions. During the detection process, an anion and cation eluent is used to flush the anions and cations in the anion and cation chromatographic column, leaving only dichromate or chromium ions to enter the detector 32. This can avoid interference from chromium ions when detecting dichromate content, or avoid interference from dichromate when detecting chromium ion content.

[0034] Based on the above technical solution, Figure 2 As shown, the first liquid storage part 21, the second liquid storage part 22 and the third liquid storage part 23 all include a first injection pump 211, an injection valve 212 and a cache tube 213, the first injection pump 211 is connected to the injection valve 212, the injection valve 212 includes an inlet 2121 and an outlet 2122, the inlet 2121 is connected to the pure water supplier 214, and the outlet 2122 is connected to the cache tube 213, wherein the first injection pump 211 can drive the pure water in the pure water supplier 214 into the cache tube 213 through the injection valve 212 and fill the cache tube 213.

[0035] Alternatively, as Figure 2 As shown, the first liquid storage part 21 also includes a first four-way valve 215, the first end of the first four-way valve 215 is connected to the cache tube 213, the second end is connected to the chloride ion reactor 11, the third end is connected to the mixer 26, and the fourth end is connected to the waste tank 28, wherein the first end can be connected to the second end, the third end or the fourth end respectively.

[0036] After the sample is dechlorinated by the chloride ion reactor 11, the first injection pump 211 first drives pure water from the injection valve 212 into the buffer tube 213, and then drives the dechlorinated sample greater than a preset amount from the second end of the first four-way valve 215 to the first end and enters the buffer tube 213. Subsequently, the first injection pump 211 uses the pure water in the buffer tube 213 as power to push the dechlorinated sample from the third end into the mixer 26. The remaining liquid in the buffer tube 213 can enter the waste tank 28 from the fourth end. The first storage of pure water in the buffer tube 213 prevents the sample that subsequently enters the buffer tube 213 from flowing back into the injection valve 212, thereby preventing the sample from affecting the normal operation of the injection valve 212 and the injection pump.

[0037] Alternatively, as Figure 2As shown, the second liquid storage section 22 further includes a second four-way valve 221. The first end of the second four-way valve 221 is connected to the buffer tube 213, the second end is connected to the oxidant supplier 24, the third end is connected to the mixer 26, and the fourth end is connected to the waste tank 28. The first end can be connected to the second end, the third end, or the fourth end. The working process of the second liquid storage section 22 is similar to that of the first liquid storage section 21 and will not be repeated here.

[0038] Alternatively, as Figure 2 As shown, the third liquid storage section 23 further includes a third four-way valve 231. The first end of the third four-way valve 231 is connected to the buffer tube 213, the second end is connected to the catalyst supply 25, the third end is connected to the mixer 26, and the fourth end is connected to the waste tank 28. The first end can be connected to the second end, the third end, or the fourth end. The working process of the third liquid storage section 23 is similar to that of the first liquid storage section 21 and will not be repeated here.

[0039] Based on the above technical solution, the mixing reaction module 2 also includes a waste valve, which is arranged between the mixer 26 and the reaction tube 27 and is used to discharge waste liquid between the first four-way valve 215, the second four-way valve 221 and the third four-way valve 231 and the mixer 26.

[0040] After the dechlorinated sample, oxidant and catalyst are mixed in the mixer 26, the mixed liquid enters the reaction tube 27 for reaction. At this time, there is still residual liquid between the first four-way valve 215, the second four-way valve 221 and the third four-way valve 231 and the mixer 26. After the mixed liquid enters the reaction tube 27, it can be discharged to the waste tank 28 through the waste valve to avoid affecting the subsequent mixing process.

[0041] Based on the above technical solution, the mixer 26 is provided with a second injection pump 261 for driving air into the mixer 26 to push the mixed liquid into the reaction tube 27 .

[0042] After the dechlorinated sample, oxidant and catalyst are mixed in a certain proportion in the mixer 26 at the same time, the second injection pump 261 injects air into the mixer 26, and uses the air as power to push the mixed solution into the reaction tube 27 for reaction.

[0043] Based on the above technical solution, the reaction tube 27 is equipped with a heating element 271 and a cooling element 272 for heating and cooling the reaction tube 27. As the mixed solution flows through the reaction tube 27, the heating element 271 heats the reaction tube 27 to allow the mixed solution in the reaction tube 27 to fully react. After the reaction is complete, the reaction tube 27 is cooled and the cooled solution is ready for testing.

[0044] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments. Any changes or modifications based on the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A device for detecting chemical oxygen demand of sewage, characterized in that: It includes a dechlorination module, a mixing reaction module and a detection module. The dechlorination module includes a chloride ion reactor for removing chloride ions in the sample. The mixing reaction module includes a first liquid storage part, a second liquid storage part, a third liquid storage part and a mixer. The first liquid storage part is connected to the chloride ion reactor, the second liquid storage part is connected to the oxidant supplier, and the third liquid storage part is connected to the catalyst supplier. The first liquid storage part, the second liquid storage part and the third liquid storage part are all connected to the mixer, and preset amounts of sample, oxidant and catalyst are respectively delivered to the mixer for mixing at the same time. The mixing reaction module also includes a reaction tube, one end of which is connected to the mixer. The detection module includes a doser, a detector and a six-way valve, the first end of the six-way valve is connected to the reaction tube, the second end is connected to one end of the doser, the third end is connected to the other end of the doser, and the fourth end is connected to the detector.

2. The device for detecting chemical oxygen demand of sewage according to claim 1, characterized in that: The detection module further includes a washing liquid supplier, the fifth end of the six-way valve is connected to the washing liquid supplier, and the sixth end is connected to the waste drain tank.

3. The device for detecting chemical oxygen demand of sewage according to claim 2, characterized in that: The quantitative device is a quantitative loop anion chromatography column or a quantitative loop cation chromatography column, and the eluent supplier provides an anion eluent or a cation eluent.

4. The device for detecting chemical oxygen demand of sewage according to claim 3, characterized in that: The first liquid storage part, the second liquid storage part and the third liquid storage part all include a first injection pump, an injection valve and a cache tube. The first injection pump is connected to the injection valve. The injection valve includes an inlet and an outlet. The inlet is connected to the pure water supplier, and the outlet is connected to the cache tube. The first injection pump can drive the pure water in the pure water supplier into the cache tube through the injection valve and fill the cache tube.

5. The device for detecting chemical oxygen demand of sewage according to claim 4, characterized in that: The first liquid storage part also includes a first four-way valve, the first end of the first four-way valve is connected to the cache tube, the second end is connected to the chloride ion reactor, the third end is connected to the mixer, and the fourth end is connected to the waste tank, wherein the first end can be connected to the second end, the third end or the fourth end respectively.

6. The device for detecting chemical oxygen demand of sewage according to claim 5, characterized in that: The second liquid storage part also includes a second four-way valve, the first end of the second four-way valve is connected to the cache tube, the second end is connected to the oxidant supplier, the third end is connected to the mixer, and the fourth end is connected to the waste tank, wherein the first end can be connected to the second end, the third end or the fourth end respectively.

7. The device for detecting chemical oxygen demand of sewage according to claim 6, characterized in that: The third liquid storage part also includes a third four-way valve, the first end of the third four-way valve is connected to the cache tube, the second end is connected to the catalyst supplier, the third end is connected to the mixer, and the fourth end is connected to the waste tank, wherein the first end can be connected to the second end, the third end or the fourth end respectively.

8. The device for detecting chemical oxygen demand of sewage according to claim 7, characterized in that: The mixing reaction module further includes a waste discharge valve, which is provided between the mixer and the reaction tube and is used to discharge waste liquid between the first four-way valve, the second four-way valve, the third four-way valve and the mixer.

9. The device for detecting chemical oxygen demand of sewage according to any one of claims 1 to 8, characterized in that: The mixer is provided with a second injection pump for driving air into the mixer to push the mixed liquid into the reaction tube.

10. The device for detecting chemical oxygen demand of sewage according to any one of claims 1 to 8, characterized in that: The reaction tube is provided with a heating element and a cooling element for heating and cooling the reaction tube.

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