KR200281743Y1 - Automatic On-line COD Analyzer use multi-syringe of injecting & sending System - Google Patents

Abstract

The present invention uses potassium bichromate as a driving force for the multi-syringe suction and delivery method of chemical oxygen demand (COD) dissolved in industrial sewage and wastewater treatment plants, sewage treatment plants, or aqueous aqueous samples such as rivers, rivers, and lakes. It is oxidized with aqueous solution and measured in real time with an optical sensor using Visible Rays.The measured electrical signal or data is transmitted to the signal transmission control device. Sends data to general managers in real time to check the abnormal condition of effluents discharged to the water system when discharging, and multi-cylinder to monitor and manage the COD concentration of effluents at a long distance without deploying on-site personnel at low cost. The present invention relates to a COD _Cr continuous automatic measuring device using a suction and a feeding method.

The present invention, such as COD, a representative item for measuring water pollution, is reacted with an aqueous solution of potassium dichromate, which is highly oxidizing, and analyzed in real time using a visible ray absorbance sensor to measure the amount of organic substances discharged into the water system. Tens of thousands of targets can be monitored and managed at the same time by the central control center, and the need for personnel to constantly monitor the site situation can be eliminated, thereby significantly reducing the cost of monitoring pollutants and TMS (Tele-). By supporting monitoring system related integrated management network, it is easy to connect with peripheral equipment and apply on site. In addition, the present invention is a device capable of laboratory scale analysis as well as field application, and it is possible to improve the difficulty of maintaining reproducibility due to the change of water pollution with time of sample water and the error of analytical data according to the experimenter. Measurements can be made continuously and the experiments and manipulations are simple to get fast and accurate analysis data.

Description

Continuous automatic measuring device for chemical oxygen demand using multi-cylinder suction and pressure method {Automatic On-line COD Analyzer use multi-syringe of injecting & sending System}

The present invention monitors the chemical oxygen demand (COD) concentration of wastewater discharged into the water system at all times and sends the data to the general manager to check the abnormal condition of the wastewater in real time. The present invention relates to a COD _Cr continuous automatic measuring device using a multiple syringe suction / pressure method for monitoring and managing COD concentration.

In general, when polluted water is discharged to the general water system through the final outlet, the polluted water is discharged from the outlet through the final outlet. The water quality of the incoming water must be maintained at all times and measured for the concentration of the pollutant that represents the discharge quality.

BOD, COD, pH, EC, SS, Turbidity, DO, TN / TP and TOC are important as representative water pollution measurement items.In general, the water discharged from the effluent is used to measure the quality of the effluent. It should be collected depending on the general manpower, and it is required to measure and record the control items by itself according to the process test method of the national certified. However, this self-management method is difficult to be recognized for reliability and objectivity from the sampling stage, and it is difficult for laboratory scale analysis to maintain reproducibility due to changes in water pollution over time of sample water and errors in analytical data depending on the experimenter. . In order to remedy this problem and speed up the analysis, each measuring instrument has been developed and popularized according to water pollution measurement items.

Most conventional measuring instruments follow a method of arbitrarily collecting and measuring a sample, and employing an electrode potential difference method, a thermal catalytic oxidation method, an ozone catalytic oxidation method, an oxidation / reduction potential difference titration method, and an ultraviolet absorbance method.

Therefore, there is a problem that the sample number analysis is not continuous, the reproducibility of the analysis data is poor, and the maintenance of the equipment is difficult.

In addition, some companies develop and sell field-mounted COD measurement equipment, but the installation of direct-automatic continuous automatic measurement equipment is expensive, the maintenance of equipment is difficult during unmanned management, and the reliability of the measurement value of the field continuous measurement equipment is low. .

In addition, current organic measuring equipment is difficult to measure continuously or real-time, and no system has been developed to measure a large number of samples continuously.

In this design, we developed a COD _Cr continuous automatic measuring device that can continuously analyze a large number of samples by automatic sample collection, injection, and feeding system. In practice, we have developed a system that automatically measures COD concentration in water within a short time in real time to improve the reproducibility and reliability of analytical data so that objective data can be obtained, and can transmit water quality data to the central control center in continuous and real time. The purpose is to provide a system.

Accordingly, the present invention can continuously analyze a large number of samples using a reagent injection / transfer method using multiple syringes, obtain a reduction in reagent consumption, and ASTM (America Society) for oxidizing potassium dichromate aqueous solution and samples. COD _Cr analysis method for the testing and materials has improved the measurement method using the visible ray sensor and the automatic cleaning and calibration equipment to enable quick water quality analysis. Provide a management system.

In addition, it solves problems such as maintenance of field-installed measuring equipment, real-time water quality measurement and data transmission in a short time, and supports GIS-based integrated management network, so it is easy to develop peripheral equipment and apply on site, and it is related to any terrain or location. Since it can be installed and operated without any damage, it provides a system that can help the original monitoring and management of water pollution sources.

In addition, the present invention is a device capable of laboratory scale analysis as well as field application, improves the difficulty of maintaining reproducibility due to the change of water pollution according to the time of sample water and the error of analysis data according to the experimenter, and continuous multiple samples. It can be easily measured and operated, and the device can be obtained quickly and accurately analysis data.

1 is an exemplary view showing the overall configuration of a COD _Cr continuous automatic measuring device using a multiple syringe suction / pressure method of the present invention

Figure 2 is an exemplary view showing the main part of the COD _Cr continuous automatic measurement apparatus according to the present invention

3 is an exemplary view showing the configuration of a multiple syringe pump device according to the present invention

<Description of the symbols for the main parts of the drawings>

2: automatic sample collection device 3: dilution device

4: multiple syringe pump device 5: micro metering pump

6: line mixer 7: electric furnace

8 cooling device 9 light sensor

10: optical control device 13: signal transmission control device

14: multiple syringe pump control device

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view showing the overall configuration of a COD _Cr continuous automatic measuring device using a multiple syringe suction and compression method according to the present invention, Figure 2 is a block diagram showing the main part of the COD _Cr continuous automatic measuring device 3 is a schematic configuration diagram showing the configuration of a multiple syringe pump device. The present invention is a system capable of continuously measuring a sample and a plurality of samples, and a COD automatic measuring device for continuously measuring COD concentration in real time. (17) and the COD analysis data of the water system measured by the automatic measuring device 17 are transmitted to the manager of the management room by the remote management device.

The present invention pumps the water in the river water into the metering pump (2b) and removes the foreign matter or sludge in the pretreatment process (2a) and uses it as a sample, and the COD of the sample collected by the automatic sampler (2) If the concentration exceeds the measured value, the dilution device (Diluter) (3) to dilute a certain ratio to use as a sample.

The sample is pumped to the line mixer (6) by a micro metering pump (5) which can be adjusted up to 3.6 ml per minute, and reacts with the aqueous potassium dichromate solution (1) to induce oxidation. The aqueous potassium dichromate solution (1) is COD According to the concentration, the preparation method and the reagent composition were different, and considering the chemical reactions of chromium, sulfuric acid, silver, and mercury, the potassium dichromate aqueous solution reservoirs (1a, 1b, 1c) were installed in three categories.

The aqueous potassium dichromate solution (1) is injected at a constant rate, which minimizes the amount of injection used in terms of consumption, operation management cost, and environmental pollution, enables continuous measurement of samples, and maximizes the transport capacity of the aqueous solution (1). In order to use the multiple syringe pump device (4).

As shown in FIG. 3, the multi-syringe pump device 4 has different injection doses of the potassium dichromate aqueous solution 1, and thus, the size of the syringe 4a is adjusted. In order to prevent leakage of the aqueous solution (1) by friction and air suction related to the vertical movement of the syringe (4a) and the piston (4c) during injection and compression, a durable fluorine-based O-ring (4b) was used.

In addition, in order to finely control the working distance of the piston (4c) to determine the one-time injection amount of the potassium dichromate aqueous solution (1), the lead of the guide (4f) was precisely processed to the minimum interval, the syringe (4a) and the piston ( A stepping motor 4g was mounted to smoothly operate the vertical motion of 4c) in the up and down direction. In addition, in consideration of the rotation rate of the stepping motor 4g and the precise operating distance of the guide 4f, a gear 4h having a ratio of 1: 4 was manufactured, and the operation safety of the multiple syringe pump device 4 was secured. To this end, a limit contact 4e was installed at the piston connecting rod 4d. In addition, a micro syringe 3-way valve was installed to adjust the injection direction of the aqueous potassium dichromate solution (1), and to control the operation time, distance or speed, and the total number of operation of the multiple syringe pump device (4). Multiple syringe pump controls 14 were constructed and incorporated.

In the line mixer 6, since the exothermic reaction is accompanied with the mixing of the sample and the potassium dichromate aqueous solution, Teflon was manufactured, and the inside of the line mixer 6 was spirally processed to improve the mixing ratio. In addition, the connection pipes of all devices were connected by Teflon tubes, which were resistant to heat and strong acid. The mixed sample and the potassium dichromate aqueous solution pass through an electric furnace 7 maintaining 200 ° C. for several minutes and undergo an oxidation reaction. A glass tube 7a made of Pyrex material is built in the electric furnace 7. The elapsed time of the oxidation reaction was optimized and the sample could be moved continuously instead of one time, so that the COD concentration could be analyzed in real time continuously.

The oxidized sample is cooled to room temperature in a cooling device 8 having an air cooled Pyrex glass tube 8a, and moved to an optical sensor 9 to measure COD concentration according to color change or brightness of chromium. It is done.

The optical sensor 9 used a tungsten-halogen lamp that generates a wavelength of visible light, and after passing the visible light emitted from the tungsten-halogen lamp through a cell in the sample direction (quartz, glass tube made of Pyrex) It is divided into two by half mirror, and it detects and detects photodiode by selecting only the wavelength of 420nm and 600nm through the filter, and the reference direction receives the visible line directly from the lamp and filters the filter like the sample direction. Only the wavelengths of 420nm and 600nm are selected and recognized as photodiodes. The detected amount of light is output as a measured value through an electrical signal and scaling.

The reaction solution of the potassium dichromate aqueous solution and the sample measured as described above will be stored in the container 12 and regularly collected in order to prevent environmental pollution.

The COD _Cr automatic measuring device 17 constituted by the above apparatus is a device equipped with the light control device 10 which displays the measured output signal as an electrical signal such as 4 to 20 mA or -10 to + 10 mV. It is composed of a device that can be calibrated to have a constant measured value by the device directly expressed in units such as ppm or g / ℓ, and the measured value of the COD concentration of the automatic measuring instrument 17 is an output signal of digital or analog type Is sent to a signal transmission control device 13 having an automatic control logic for single or multiple operation or control, which is directly connected to the driving motor and pumping devices associated with the sample dilution device 3. Is treated as. The signal transmission control device 13 is connected to a microprocessor using an interface card to control various components based on a preset operating logic and to have a function to be controlled by a signal output from the COD _Cr automatic measuring instrument 17. All signals are connected to 4-20mA or RS232 and RS485 telephone wired communication link or CDMA wireless communication link 11, and are configured to be outputted and operated by a computer or PLC corresponding to a PC.

In addition, it has built-in LCD screen 15 and computer output printer 16 so that the operation logic of automatic measuring instrument 17 and COD analysis data can be seen at the site during installation. The other equipment required for the installation was installed.

The above-mentioned device is to analyze the COD concentration of river water system in real time and transmit data and signals so that the water pollution status can be monitored and managed unattended.

The present invention is not limited to the above-described specific preferred embodiments, and any person having ordinary skill in the art to which the present invention pertains may make various modifications without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

The present invention is an on-site installation type that is one step higher than the existing water pollution measuring instruments, and can continuously analyze a large number of samples by an automatic sample collection, injection, and transport system, and continuously measures the COD concentration of the water system in real time within a short time. We developed equipment to improve the reproducibility and reliability of analysis data to secure objective data. It is a system that can transmit water quality data to the central control center continuously and in real time. It uses reagent injection and transport method using multiple syringes. Reducing the consumption of reagents can be obtained.

In particular, the COD _Cr method of the American Society for Testing and Materials (ASTM), which oxidizes aqueous potassium dichromate solution and samples, improved the measurement method using Visible Rays Sensor and improved automatic cleaning and calibration equipment to enable rapid water quality analysis. In addition, there is an effect that provides a remote management system for affordable and affordable facility management suitable for the domestic situation.

In addition, the present invention supports the GIS-based integrated management network by solving problems such as maintenance of field-installed measuring equipment and real-time water quality measurement and data transmission within a short time, and is easy for the development and application of peripheral equipment. Since it can be installed and operated regardless of location, it has the effect of providing a system that can help to fundamentally monitor and manage water pollutant-related materials including COD concentration in water systems.

Claims (4)

An automatic measuring instrument that oxidizes the chemical oxygen demand (COD) dissolved in an aqueous solution phase of an aqueous solution with a potassium bichromate aqueous solution (1) by using a multi-syringe suction / transfer method as a driving force and measures it with an optical sensor (9) using absorbance of visible light. (17) is composed, A multi-syringe pump device 4 for maximizing the feeding of the aqueous potassium dichromate solution 1, Automatic sample retrieval device (2) to pump the water in the stream water with the metering pump (2b) and to collect the sample by removing the foreign matter or sludge in the pretreatment process (2a), The dilution apparatus 3 for diluting at a predetermined rate when the COD concentration of the sample collected by the automatic sample collection device 2 exceeds the measured value, And, the micro sample pump (5) to adjust the sample collected in the automatic sample collection device (2) and dilution device (3), A line mixer (6) formed of Teflon to mix the aqueous solution and the sample passed through the multiple syringe pump device (4) and the micro metering pump (5), The electric furnace 7 in which the Pyrex glass tube 7a is built into the sample and the aqueous solution mixed with the line mixer 6 at 200 ° C. for oxidation reaction, The cooling device 8 in which the air-cooled Pyrex glass tube 8a which cools the sample oxidized by the said electric furnace 7 to room temperature, and The optical sensor 9 is moved from the cooling device 8 to measure the COD concentration according to the color change or brightness of chromium, The multi-syringe suction / pressure system comprising the optical control device 10 for controlling the optical sensor 9 and a signal transmission control device 13 for transmitting measured electrical signals or data. Continuous automatic measurement of chemical oxygen demand using The method of claim 1, The multiple syringe pump device (4) is equipped with a syringe (4a) and a piston (4c) to each other to inject and push the aqueous potassium dichromate solution (1), the aqueous solution leaks in the inner circumference of the syringe (4c) O-ring (4b) is inserted in order to prevent that, the piston connecting rod (4d) is provided with a limit contact (4e) is installed at one end of the piston (4c), the guide (4f) below the piston connecting rod (4d) And a stepping motor 4g and a gear 4h for smoothing vertical movement of the syringe 4a and the piston 4c on the side of the guide 4f are configured. Continuous automatic measuring device for chemical oxygen demand using liposuction and pressure feeding method. The method of claim 1, When the COD concentration of the water system measured by the automatic measuring device 17 exceeds a predetermined concentration or more, the dilution device 3 receives an electrical signal through the signal transmission control device 13 to maintain a constant sample of the water system. A continuous automatic measuring device for chemical oxygen demand using a multiple syringe suction / pressure method, which is driven to be diluted at a ratio. The method of claim 1, The optical sensor 9 of the automatic measuring device 17 uses a tungsten-halogen lamp for generating a wavelength of visible light, and divides the visible light emitted from the lamp into a sample direction and a reference direction to filter only wavelengths of 420 nm and 600 nm. A chemical oxygen demand continuous automatic measuring device using a multiple syringe suction and pressure method, characterized in that the selected and recognized by the photo-diode and detected, and outputs the detected light amount as a measured value through the electrical signal and scaling.