CN214067048U - High chlorine waste water COD detection device - Google Patents
High chlorine waste water COD detection device Download PDFInfo
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- CN214067048U CN214067048U CN202022955056.6U CN202022955056U CN214067048U CN 214067048 U CN214067048 U CN 214067048U CN 202022955056 U CN202022955056 U CN 202022955056U CN 214067048 U CN214067048 U CN 214067048U
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Abstract
The utility model discloses a high chlorine wastewater COD detection device, which comprises a pretreatment system, a preselection system, a detection system and a control system; the pretreatment system comprises a water collecting tank, a pure water tank, a purifier and a pool to be detected; the clear water outlet of the water collecting tank is connected with the water inlet end of the purifier, the clear water end of the purifier is connected with the pool to be detected, and the concentrated water end of the purifier and the water outlet at the bottom of the pool to be detected are respectively connected with the water collecting tank; the preselection system comprises a reference pool, a preselection electrode and a positioning cloud platform, wherein the reference pool is connected with the common wall of the pool to be detected, and the preselection electrode moves between the reference pool and the pool to be detected through the positioning cloud platform; the detection system comprises a sample injector, an atomizer, a burner and a detector; one end of the sample injector is positioned in the branch pipe of the pool to be detected, and the other end of the sample injector is connected with the atomizer; the outlet of the atomizer is positioned in the combustor; the outlet of the burner is communicated with the detector; the detection signal of the detector is connected with a control system through a lead. The utility model discloses the interference that high concentration chloridion produced COD when can eliminating the detection.
Description
Technical Field
The utility model belongs to the technical field of industrial waste water quality testing, concretely relates to high chlorine waste water COD automatic checkout device.
Background
Chloride ion (Cl)-) Is commonly found in various waste waters. The high-chlorine wastewater is special industrial wastewater, is commonly used in industries such as petrochemical industry, mining, food processing, rare earth smelting, tanning (tanning), chemical pharmacy, papermaking, textile, paint, pigment, mechanical manufacturing and the like, is named after the high content of chloride ions, and generally has the chloride ion content of 10000-100000 mg/L or even higher. High chlorine means high salinity, strong corrosivity, not only has special requirements to contact tubular product, and the processing degree of difficulty is high moreover, can cause huge destruction to natural environment when discharging in a large number. Chemical Oxygen Demand (COD) is an important wastewater pollutant total amount control index, the COD standard discharge limit value is continuously reduced along with the continuous enhancement of the environmental protection strength of China, but the COD determination is obviously interfered by the existence of a large amount of chloride ions in the wastewater, the COD is caused to be 'virtual high', theoretically, every 1000mg/L of chloride ions can increase the COD of the wastewater to be measured by about 250mg/L, and the accuracy of the measurement result is seriously influenced. Therefore, aiming at the high-chlorine wastewater, equipment and a method capable of effectively detecting COD are developed, the accuracy and the reliability of detection data are ensured, and the method has great significance for environment protection and environment detection.
At present, the COD detection method of high-chlorine wastewater mainly comprises a chloride ion calibration method (GB/T31195-. In addition, the two correction methods have the problems of complicated operation steps and long detection time, and are difficult to perform large-batch and high-efficiency detection. The spectrophotometry firstly adopts the measures of dilution or chlorine reduction to pretreat the high-chlorine wastewater, then utilizes potassium dichromate to oxidize the wastewater to be detected, and finally adopts the photometry to detect the residual potassium dichromate, and the upper limit of the chloride ion detection also reaches 20000 mg/L. However, in all of the three methods, potassium dichromate is used as an oxidant, mercury sulfate is used as a masking agent, a large amount of chromium-containing and mercury-containing heavy metal detection waste liquid is generated, and the environmental hazard is great.
The total organic carbon method is characterized in that combustible organic matters in the wastewater to be detected are oxidized into carbon dioxide by high temperature according to the HJ 501-2009 standard, then the COD value of the wastewater is obtained by converting the concentration of the carbon dioxide, the interference of chloride ions can be completely shielded theoretically, and the method is an ideal high-chlorine wastewater COD detection method, but the method is greatly influenced by the fluctuation of the water quality of the wastewater, and a standard curve needs to be frequently checked during detection, so that the detection difficulty and the workload are increased. And the higher the chloride ion concentration is, the higher the salinity and impurity content in the wastewater are, and the larger the interference generated during detection is.
In summary, the development of a high-chlorine wastewater COD detection device and method which are automatic, intelligent and strong in water quality change adapting capability is urgently needed.
SUMMERY OF THE UTILITY MODEL
For solving the technical deficiencies such as current high chlorine waste water COD detection method operating procedure complicacy, detection efficiency low, secondary pollution is serious, poor stability, degree of automation are not high, the utility model provides a high chlorine waste water COD automatic checkout device can effectively eliminate the interference of high concentration chloridion to COD, simple operation, selectivity are strong, high automation and no secondary pollution, and application scope is wide.
In order to achieve the above purpose, the utility model provides the following technical scheme:
an automatic COD detection device for high-chlorine wastewater comprises a pretreatment system, a preselection system, a detection system and a control system;
the pretreatment system comprises a water collecting tank, a pure water tank, a purifier and a pool to be detected; a clear water outlet at the upper part of the water collecting tank is connected with a water inlet end of a purifier through a first booster pump, a clear water end of the purifier is connected with a pool to be detected, and a concentrated water end of the purifier and a water outlet at the bottom of the pool to be detected are respectively connected with the lower part of the water collecting tank; the pure water tank is respectively connected with the pool to be detected and the water collecting tank, and the pool to be detected and the water collecting tank are cleaned by the distilled water without carbon dioxide in the pure water tank; the pond to be detected is provided with a branch pipe of the pond to be detected, and the lower end of the branch pipe of the pond to be detected is communicated with the pond to be detected so that the branch pipe of the pond to be detected and the pond to be detected form a Y shape;
the preselection system comprises a reference pool, a preselection electrode and a positioning cloud platform, wherein the reference pool is connected with the common wall of the pool to be detected, at least half of the preselection electrode is immersed in reference liquid of the reference pool or high-chlorine wastewater to be detected of the pool to be detected, the preselection electrode is connected with the positioning cloud platform, and the preselection electrode is moved between the reference pool and the pool to be detected through the positioning cloud platform;
the detection system comprises a sample injector, an atomizer, a burner and a detector; one end of the sample injector is positioned in the branch pipe of the pool to be detected, the other end of the sample injector is connected with the sample injection end of the atomizer through a pipeline, and the sample injector absorbs the high-chlorine wastewater in the pool to be detected and injects the high-chlorine wastewater into the atomizer; the gas inlet end of the atomizer is connected with a gas pump, the combustion improver is pumped into the atomizer by the gas pump, the outlet of the atomizer is positioned in the burner, the high-chlorine wastewater is atomized into tiny droplets in the atomizer, and the tiny droplets enter the burner along with the combustion improver to be completely combusted; the outlet of the burner is communicated with a detector, and the detector detects CO2The content is calculated out according to the standard curve, and the COD value of the high chlorine wastewater to be measured is calculated out; the gas outlet pipeline of the detector is provided with a gas outlet pipe for discharging gas into air through a draught fan; and the detection signal of the detector is connected with the control system through a lead.
Pretreatment system, preliminary election system, detecting system and control system install in the casing.
Preferably, a water inlet pipeline is arranged at the upper part of the water collecting tank; the lower part of the water collecting tank is narrower than the upper part of the water collecting tank so as to facilitate the rapid sedimentation of large particles; and an outlet pipeline at the bottom of the water collecting tank is provided with a first electromagnetic valve.
The utility model has no clear requirements on the high and low order of the water collecting tank, the pool to be detected, the pure water tank and the water purifier; according to the conventional habit, the pure water tank, the to-be-detected pool and the water purifier are all higher than the water collecting pool.
Preferably, the working pressure of the first booster pump is 0.1 to 2.5 MPa.
Preferably, the purifier is an ultrafiltration membrane component with the aperture of the ultrafiltration membrane of 0.05-0.45 micrometer. The ultrafiltration membrane in the purifier intercepts solid substances in the high-chlorine wastewater, and chloride ions are in a dissolved ion state in the wastewater, so that the loss of the chloride ions is avoided.
Preferably, a second electromagnetic valve is arranged on a connecting pipeline between the concentrated water end of the purifier and the water collecting tank; and a third electromagnetic valve is arranged on a connecting pipeline of the water outlet at the bottom of the inspection tank and the water collecting tank.
The pure water tank holds distilled water for removing carbon dioxide.
Preferably, the outlet pipeline of the pure water tank is provided with a second booster pump, and the outlet of the second booster pump is respectively connected with the top of the inspection pool and the upper part of the water collecting tank. Preferably, a fourth electromagnetic valve is arranged on a connecting pipeline between the second booster pump and the pool to be detected; and a fifth electromagnetic valve is arranged on a connecting pipeline of the second booster pump and the water collecting tank.
Preferably, the pre-selection electrode consists of a chloride ion selective electrode and a calomel reference electrode.
Preferably, the positioning holder consists of a transverse holder and a longitudinal holder, the transverse holder enables the preselection electrode to rotate left and right, the longitudinal holder enables the preselection electrode to rotate front and back, and the preselection electrode moves between the reference cell and the cell to be detected through the positioning holder. More specifically, the shaft of the transverse holder is vertically arranged, and the longitudinal holder and the preselected electrode are driven by the transverse holder to swing around in the horizontal plane (overlooking angle); the axis of the longitudinal holder is horizontally arranged, the preselection electrode is fixed by a jacket connected with the axis of the longitudinal holder, and the longitudinal holder drives the preselection electrode to circumferentially swing back and forth in a paper plane (front view angle). The mounting between the longitudinal head, the transverse head and the preselected electrode can be carried out by a person skilled in the art. The positioning cradle head realizes the movement of the preselected electrode between the reference pool and the pool to be detected by the following modes: the longitudinal holder rotates forwards or backwards for a certain angle to drive the pre-selection electrode to leave the reference cell; then the transverse holder rotates to the left to drive the longitudinal holder and the pre-selection electrode to come above the pool to be detected; the longitudinal holder rotates backwards or forwards to enable the pre-selection electrode to enter the interior of the pool to be detected; and after the detection is finished, the program is reversely executed to enable the preselected electrode to be reset.
Preferably, the reference solution is a sodium chloride standard solution prepared from distilled water with carbon dioxide removed, and the concentration of the sodium chloride standard solution is 50000mg/L in terms of chloride ion concentration. In actual operation, the concentration of chloride ions in the reference solution can be adjusted by those skilled in the art according to actual needs.
Preferably, the junction of the sample injector and the branch pipe of the pool to be detected is sealed through a rubber plug.
Preferably, the burner is a hollow tubular resistance-type heating pipe, and grooves or circular protrusions are distributed on the inner surface of the inner wall of the burner, so that atomized liquid drops can be fully contacted with the burner, the combustion is full, gas diffusion is facilitated, and the deposition of combustion solid products is avoided; the material of the burner is ceramic which is resistant to chloride ion corrosion; the operating temperature of the burner was 900 ℃. The main components of the gas generated by the combustion of the high-chlorine wastewater to be measured in the combustor are carbon dioxide and excessive oxygen, and the gas belongs to harmless substances and is very small in amount.
Preferably, the detector is CO2Infrared detector or CO2Sensor, detecting CO by detector2And (4) converting the content into the COD value of the high-chlorine wastewater to be detected according to a standard curve.
Preferably, the air inlet end of the atomizer is connected with an external air source, and the combustion improver in the external air source is pumped into the atomizer by a gas pump.
In view of the fact that detection accuracy of the detector and the life of the detector are affected if the gas is directly detected without cooling after combustion, a cooling chamber is further provided between the burner and the detector for cooling the gas discharged from the burner.
Preferably, the cooling chamber is a hollow cooling chamber, the volume of the cooling chamber is 30-50 times of the volume of the combustor, high-temperature gas discharged by the combustor enters the cooling chamber, the volume is suddenly enlarged, and the gas temperature is reduced to be lower than 100 ℃ by performing rapid heat exchange with the outer periphery of the cooling chamber. The cooling chamber is made of stainless steel.
Preferably, the control system comprises a controller and a display screen; cl measured by a preselected electrode-Content, CO measured by the detector2The content is fed back to the controller, and the result is stored and displayed on a display screen or output by the controller. The control system controls the sample injector, the positioning cradle head, the pre-selection electrode, the burner, the detector, the electromagnetic valve and the like, and the control method is a conventional signal feedback response method.
The method for detecting the COD of the high-chlorine wastewater based on the detection device comprises the following steps:
step (1), cleaning a pool to be detected and a water collection tank by using distilled water without carbon dioxide;
step (2), allowing the high-chlorine wastewater to be detected to enter a water collecting tank, standing, allowing large particles in the wastewater to sink to the bottom of the water collecting tank under the action of gravity, sequentially starting a first booster pump (with the working pressure of 0.1-2.5 MPa) and a second electromagnetic valve, allowing the wastewater to enter a purifier through the first booster pump for filtering, completely intercepting fine suspended particles in the high-chlorine wastewater, allowing the purified high-chlorine wastewater (namely fresh water) to enter a pond to be detected, returning concentrated water to the water collecting tank through the second electromagnetic valve, and then closing the first booster pump;
step (3), starting a burner and a detector in sequence for preheating, and preheating the burner to 300-500 ℃; cleaning the combustor, the cooling chamber and the detector by using air; then starting the transverse holder and the longitudinal holder, transferring the pre-selection electrode from the reference pool to the pool to be detected, performing pre-selection detection on the purified high-chlorine wastewater, and determining the content of chloride ions;
step (4) according to the preselection detection result in the step (3), high-chlorine wastewater is sucked from the pool to be detected by a sample injector and injected into an atomizer, a combustion improver is introduced into the atomizer by a gas pump, the high-chlorine wastewater enters a combustor (the working temperature of the combustor is 900 ℃) along with the combustion improver for internal combustion after being atomized, the generated high-temperature gas is cooled to be lower than 100 ℃ by a cooling chamber and then enters a detector for detection, and CO is obtained2Content, feeding back the detected dataConverting the COD value of the high-chlorine wastewater to be measured according to a standard curve by a controller; after the detection is finished, discharging gas under the action of a draught fan, and finishing the primary detection; carrying out parallel detection for three times, and taking an average value;
step (5), closing the sample injector and the combustor in sequence, and closing the gas pump, the detector and the induced draft fan in sequence after the combustor is cooled; starting the transverse holder and the longitudinal holder, and transferring the preselected electrode from the pool to be detected to a reference pool for soaking; and then opening the first electromagnetic valve and the third electromagnetic valve in sequence, emptying the high-chlorine wastewater, and finishing the detection of one sample.
In the step (1), the method for cleaning the pool to be detected and the water collection tank comprises the following steps: opening the first electromagnetic valve and the third electromagnetic valve, then opening the fourth electromagnetic valve and the fifth electromagnetic valve in sequence, then opening the second booster pump, under the action of the second booster pump, enabling the distilled water without carbon dioxide in the pure water tank to enter the pool to be detected through the fourth electromagnetic valve, and enter the water collecting tank through the fifth electromagnetic valve, and leaching the pool to be detected and the water collecting tank; and after the leacheate is emptied, the second booster pump, the fourth electromagnetic valve and the fifth electromagnetic valve are closed in sequence, and then the third electromagnetic valve and the first electromagnetic valve are closed in sequence.
In the step (3), the cleaning method of the combustor, the cooling chamber and the detector comprises the following steps: and (4) starting a gas pump and an induced draft fan in sequence, and cleaning the combustor, the cooling chamber and the detector by air.
Specifically, the content of chloride ions in the purified high-chlorine wastewater is detected for three times, and an average value is taken.
In the step (4), the content of chloride ions in the high-chlorine wastewater is 10000-100000 mg/L. According to the different chloride ion content of preselection testing result, the sample injection volume of injector is different, and higher the chloride ion, the sample injection volume is bigger to furthest reduces the error. When the content of the chloride ions is less than or equal to 50000mg/L, the sample amount of the sample injector is less than or equal to 1000 mu L and less than or equal to 50 mu L; when the content of the chloride ions is more than 50000mg/L, the sample amount of the sample injector is more than 1000 mu L and less than or equal to 5000 mu L.
The combustion improver is high-purity oxygen with the purity of 99.9999 percent. The combustion improver is excessive relative to the high-chlorine wastewater, and generally, the flow of the combustion improver is 0.2L/s-2.5L/s.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses high chlorine waste water COD detection device passes through the preselection of chloride ion, and differentiation waste water detects the quantity, and high concentration chloride ion produces the interference of waste water COD when can eliminating the detection, and anti detection interference ability is stronger, realizes high chlorine waste water COD's serialization, automatic detection, does not use during the detection and produces chromium, contain mercury heavy metal detection waste liquid, green, and is easy and simple to handle, and sensitivity is high.
Drawings
FIG. 1 is a schematic structural diagram of a COD detection device for high-chlorine wastewater.
FIG. 2 is a schematic diagram of a pretreatment system of the automatic COD detection device for high-chlorine wastewater.
FIG. 3 is a schematic diagram of a preselection system of the automatic COD detection device for high-chlorine wastewater.
FIG. 4 is a schematic diagram of a detection system and a control system of the automatic COD detection device for high-chlorine wastewater.
The device comprises a shell, a water collecting tank, a pure water tank, a purifier, a 5-to-be-detected pool, a 6-to-be-detected pool branch pipe, a 7-water inlet pipe, a 8-first electromagnetic valve, a 9-first booster pump, a 10-second electromagnetic valve, a 11-third electromagnetic valve, a 12-second booster pump, a 13-fourth electromagnetic valve, a 14-fifth electromagnetic valve, a 15-reference pool, a 16-preselection electrode, a 17-transverse holder, an 18-longitudinal holder, a 19-sample injector, a 20-atomizer, a 21-combustor, a 22-cooling chamber, a 23-detector, a 24-gas pump, a 25-induced draft fan, a 26-controller and a 27-display screen.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings and examples. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of them.
Example 1
As shown in fig. 1-4, a high chlorine wastewater COD detection device comprises a pretreatment system, a preselection system, a detection system and a control system; the pretreatment system, the preselection system, the detection system and the control system are arranged in the shell 1.
The pretreatment system comprises a water collecting tank 2, a pure water tank 3, a purifier 4 and a pool 5 to be detected; a water inlet pipe 7 is arranged at the upper part of the water collecting tank 2, and a first electromagnetic valve 8 is arranged at an outlet pipeline at the bottom of the water collecting tank 6; a clear water outlet at the upper part of the water collecting tank 2 is connected with a water inlet end of the purifier 4 through a first booster pump 9, a clear water end of the purifier 4 is connected with the pool 5 to be detected through a pipeline, and a concentrated water end of the purifier 5 is connected with the bottom of the water collecting tank 2 through a second electromagnetic valve 10; the bottom of the pool to be detected 5 is connected with the lower part of the water collecting tank 2 through a third electromagnetic valve 11; a water outlet pipeline of the pure water tank 3 is provided with a second booster pump 12, an outlet of the second booster pump 12 is respectively connected with the top of the pool 5 to be detected and the upper part of the water collecting tank 2, a connecting pipeline of the second booster pump 12 and the pool 5 to be detected is provided with a fourth electromagnetic valve 13, a connecting pipeline of the second booster pump 12 and the water collecting tank 2 is provided with a fifth electromagnetic valve 14, and the pool to be detected and the water collecting tank are cleaned by the distilled water without carbon dioxide in the pure water tank; the pool to be detected 5 is provided with a branch pipe 6 of the pool to be detected, and the lower end of the branch pipe 6 of the pool to be detected is communicated with the pool to be detected 5 so that the branch pipe of the pool to be detected and the pool to be detected form a Y shape;
the preselection system comprises a reference cell 15, a preselection electrode 16 and a positioning holder, wherein the reference cell 15 is connected with the common wall of the cell to be detected 5; the preselection electrode 16 consists of a chloride ion selective electrode and a calomel reference electrode, and at least half of the preselection electrode 16 is immersed in the reference liquid of the reference pool or the high-chlorine wastewater to be detected in the pool to be detected; the positioning holder consists of a transverse holder 17 and a longitudinal holder 18, the axis of the transverse holder 17 is vertically arranged, and the transverse holder 17 drives the longitudinal holder and the preselected electrode to swing around in the horizontal plane (overlooking angle); the axis of the longitudinal holder 18 is horizontally arranged, the preselection electrode 16 is fixed by a jacket connected with the axis of the longitudinal holder, and the longitudinal holder drives the preselection electrode to circumferentially swing back and forth in a paper plane (front view angle); and the pre-selection electrode is moved between the reference pool and the pool to be detected through the positioning cradle head.
The detection system comprises an injector 19, an atomizer 20, a burner 21, a cooling chamber 22 and a detector 23; 19 one end of sample injector is located and waits to examine pond branch pipe 6, and the other end passes through the pipeline and links to each other with the introduction end of atomizer 20, absorbs the high chlorine waste water of waiting to examine in the pond and injects the atomizer into by the sample injector, and the junction that 19 and the junction of waiting to examine pond branch pipe 6 of sample injector lead toSealing by passing through a rubber plug; the inlet end of the atomizer 20 is connected with an external air source through a gas pump 24, a combustion improver (99.9999% high-purity oxygen) is pumped into the atomizer through the gas pump, the outlet of the atomizer 20 is positioned in the burner 21, high-chlorine wastewater is atomized into tiny droplets in the atomizer, and enters the burner along with the combustion improver to be completely combusted; the outlet of the burner 21 is communicated with a detector 23 through the cooling chamber 22, the gas discharged by the burner is cooled and enters the detector, and the detector detects CO2The content is calculated out according to the standard curve, and the COD value of the high chlorine wastewater to be measured is calculated out; the pipeline at the air outlet of the detector 23 is provided with a draught fan 25 for discharging air into the air; the detection signal of the detector 23 is connected with the control system through a lead.
The control system includes a controller 26 and a display screen 27; cl measured by a preselected electrode-Content, CO measured by the detector2The content is fed back to the controller, and the result is stored and displayed on a display screen or output by the controller. The control system controls the sample injector, the positioning cradle head, the pre-selection electrode, the burner, the detector, the electromagnetic valve and the like, and the control method is a conventional signal feedback response method.
In particular, the lower portion of the header tank 2 is narrowed compared to the upper portion, so that large particles are rapidly settled.
The pure water in the pure water tank 3 is distilled water from which carbon dioxide is removed.
The purifier 4 is an ultrafiltration membrane component with the aperture of a microfiltration membrane of 0.45 micron.
The reference solution is a sodium chloride standard solution prepared from distilled water with carbon dioxide removed, and the concentration of chloride ions is 50000 mg/L.
The burner 21 is a hollow tubular resistance-type heating pipe, and grooves or circular bulges are distributed on the inner surface of the inner wall of the burner; the material of the burner is ceramic which is resistant to chloride ion corrosion; the operating temperature of the burner was 900 ℃.
The cooling chamber 22 is a hollow cooling chamber made of stainless steel. The volume of the cooling chamber is 30-50 times of the volume of the combustor, high-temperature gas discharged by the combustor enters the cooling chamber, the volume is suddenly enlarged, and the gas temperature is reduced to be lower than 100 ℃ through rapid heat exchange with the outer boundary of the cooling chamber.
The detector 23 is CO2Infrared detector or CO2Sensor, detecting CO by detector2And (4) converting the content into the COD value of the high-chlorine wastewater to be detected according to a standard curve.
The method for detecting the COD of the high-chlorine wastewater based on the high-chlorine wastewater detection device comprises the following steps:
step (1), starting the device, and electrifying the controller 26 and the display screen 27; cleaning a pool to be detected and a water collecting tank: opening the first electromagnetic valve 8 and the third electromagnetic valve 11, then opening the fourth electromagnetic valve 13 and the fifth electromagnetic valve 14 in sequence, then opening the second booster pump 12, under the action of the second booster pump, introducing the distilled water without carbon dioxide in the pure water tank 3 into the pool 4 to be detected through the fourth electromagnetic valve 13, introducing the distilled water into the water collecting tank 2 through the fifth electromagnetic valve 14, and leaching the pool and the water collecting tank to be detected for 3 minutes; after the leacheate is emptied, the second booster pump 12, the fourth electromagnetic valve 13 and the fifth electromagnetic valve 14 are closed in sequence, and then the third electromagnetic valve 11 and the first electromagnetic valve 8 are closed in sequence;
step (2), high-chlorine wastewater to be detected enters a water collecting tank 2 through a water inlet pipe 7, standing is carried out, large particles in the wastewater sink to the bottom of the water collecting tank under the action of gravity, a first booster pump 9 (the working pressure is 0.1-2.5 MPa) and a second electromagnetic valve 10 are sequentially started, the wastewater enters a purifier 4 through the first booster pump for filtering, fine suspended particles in the high-chlorine wastewater are completely intercepted, fresh water enters a pool 5 to be detected, concentrated water returns to the water collecting tank 2 through the second electromagnetic valve 10, and the first booster pump 9 is closed;
step (3), sequentially starting a combustor 21 and a detector 23 for preheating, and preheating the combustor to 300-500 ℃; then, a gas pump 24 and an induced draft fan 25 are sequentially started to clean the combustor 21, the cooling chamber 22 and the detector 23; starting a transverse holder 17 and a longitudinal holder 18, transferring a preselection electrode 16 from a reference pool 15 into a pool 5 to be detected, carrying out preselection detection on the purified high-chlorine wastewater, determining the content of chloride ions, carrying out detection three times, and taking an average value, wherein the content of the chloride ions is less than 50000 mg/L;
step (4), starting a sample injector 19, sucking 500 micro-high chlorine wastewater, injecting the high chlorine wastewater into an atomizer 20, atomizing the high chlorine wastewater into micro droplets, feeding the micro droplets into a preheated combustor 21 (the working temperature of the combustor is 900 ℃) along with a combustion improver, completely combusting, feeding generated high-temperature gas into a cooling chamber 22, cooling to a temperature lower than 100 ℃, feeding the high-temperature gas into a detector 23 for detection, feeding detection data back to the controller 26 after the detection is finished, discharging the residual gas into air under the action of an induced draft fan 25, and finishing primary detection;
step (5), repeating the step (4), performing parallel detection for three times, and then taking an average value to obtain the COD value in the high-chlorine wastewater of 150.03 mg/L; close in proper order sample injector 19 and combustor 21 wait to close gas pump 24, detector 23 and draught fan 25 in proper order again after combustor 21 cools off, start horizontal cloud platform 17 and vertical cloud platform 18, transfer to reference pond 15 with preliminary election electrode 16 in waiting to examine pond 5 and soak, open in proper order again first solenoid valve 8 and third solenoid valve 11, the evacuation high chlorine waste water, a sample detects the end.
Example 2
This example differs from example 1 in that: when the high chlorine wastewater to be detected is different, the pre-selection detection result shows that the content of chloride ions is more than 50000mg/L, the sample injector 19 sucks 1500 micro-high chlorine wastewater to enter the atomizer 20, and finally, the COD value in the high chlorine wastewater is 185.9 mg/L.
Claims (10)
1. A high chlorine wastewater COD detection device is characterized by comprising a pretreatment system, a preselection system, a detection system and a control system;
the pretreatment system comprises a water collecting tank, a pure water tank, a purifier and a pool to be detected; a clear water outlet at the upper part of the water collecting tank is connected with a water inlet end of a purifier through a first booster pump, a clear water end of the purifier is connected with a pool to be detected, and a concentrated water end of the purifier and a water outlet at the bottom of the pool to be detected are respectively connected with the lower part of the water collecting tank; the pure water tank is respectively connected with the pool to be detected and the water collecting tank, and the pool to be detected and the water collecting tank are cleaned by the distilled water without carbon dioxide in the pure water tank; the pond to be detected is provided with a branch pipe of the pond to be detected, and the lower end of the branch pipe of the pond to be detected is communicated with the pond to be detected so that the branch pipe of the pond to be detected and the pond to be detected form a Y shape;
the preselection system comprises a reference pool, a preselection electrode and a positioning cloud platform, wherein the reference pool is connected with the common wall of the pool to be detected, at least half of the preselection electrode is immersed in reference liquid of the reference pool or high-chlorine wastewater to be detected of the pool to be detected, the preselection electrode is connected with the positioning cloud platform, and the preselection electrode is moved between the reference pool and the pool to be detected through the positioning cloud platform;
the detection system comprises a sample injector, an atomizer, a burner and a detector; one end of the sample injector is positioned in the branch pipe of the pool to be detected, the other end of the sample injector is connected with the sample injection end of the atomizer through a pipeline, and the sample injector absorbs the high-chlorine wastewater in the pool to be detected and injects the high-chlorine wastewater into the atomizer; the gas inlet end of the atomizer is connected with a gas pump, the combustion improver is pumped into the atomizer by the gas pump, the outlet of the atomizer is positioned in the burner, and the high-chlorine wastewater is atomized in the atomizer and enters the burner along with the combustion improver for combustion; the combustor is communicated with a detector through a cooling chamber, and the detector detects CO2The content is calculated out according to the standard curve, and the COD value of the high chlorine wastewater to be measured is calculated out; the gas outlet pipeline of the detector is provided with a gas outlet pipe for discharging gas into air through a draught fan; and the detection signal of the detector is connected with the control system through a lead.
2. The COD detector for high chlorine waste water according to claim 1, wherein the lower part of the water collecting tank is narrower than the upper part; a water inlet pipeline is arranged at the upper part of the water collecting tank; and an outlet pipeline at the bottom of the water collecting tank is provided with a first electromagnetic valve.
3. The COD detector for high chlorine waste water according to claim 1, wherein the working pressure of said first booster pump is 0.1 MPa-2.5 MPa.
4. The COD detector for high chlorine waste water according to claim 1, wherein the connecting pipeline between the concentrated water end of the purifier and the water collecting tank is provided with a second electromagnetic valve; a third electromagnetic valve is arranged on a connecting pipeline between the water outlet at the bottom of the pool to be detected and the water collecting tank; a water outlet pipeline of the pure water tank is provided with a second booster pump, and an outlet of the second booster pump is respectively connected with the top of the pool to be detected and the upper part of the water collecting tank; a fourth electromagnetic valve is arranged on a connecting pipeline of the second booster pump and the pool to be detected; and a fifth electromagnetic valve is arranged on a connecting pipeline of the second booster pump and the water collecting tank.
5. The COD detection device for high chlorine wastewater according to claim 1, wherein the purifier is an ultrafiltration membrane component with an ultrafiltration membrane pore size of 0.05-0.45 micron.
6. The COD detector for high chlorine wastewater according to claim 1, wherein the connection between the sample injector and the branch pipe of the tank to be detected is sealed by a rubber plug.
7. The COD detection device for high-chlorine wastewater according to claim 1, characterized in that the pre-selection electrode consists of a chloride ion selective electrode and a calomel reference electrode; the positioning holder is composed of a transverse holder and a longitudinal holder, the transverse holder enables the pre-selection electrode to rotate left and right, and the longitudinal holder enables the pre-selection electrode to rotate back and forth.
8. The COD detector for high chlorine waste water according to claim 1, wherein the burner is a hollow tubular resistance heating tube, and grooves or circular protrusions are distributed on the inner surface of the inner wall of the burner; the detector is CO2Infrared detector or CO2A sensor.
9. The COD detector for high chlorine wastewater according to claim 1, wherein the volume of said cooling chamber is 30-50 times of the volume of the fuel device.
10. The COD detector for high chlorine waste water of claim 1, wherein said control system comprises a controller and a display screen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022955056.6U CN214067048U (en) | 2020-12-11 | 2020-12-11 | High chlorine waste water COD detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022955056.6U CN214067048U (en) | 2020-12-11 | 2020-12-11 | High chlorine waste water COD detection device |
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| CN214067048U true CN214067048U (en) | 2021-08-27 |
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| CN202022955056.6U Active CN214067048U (en) | 2020-12-11 | 2020-12-11 | High chlorine waste water COD detection device |
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