CN105486572A - Integral intelligent COD digestion instrument - Google Patents
Integral intelligent COD digestion instrument Download PDFInfo
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- CN105486572A CN105486572A CN201510986819.4A CN201510986819A CN105486572A CN 105486572 A CN105486572 A CN 105486572A CN 201510986819 A CN201510986819 A CN 201510986819A CN 105486572 A CN105486572 A CN 105486572A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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Abstract
An integral intelligent COD digestion instrument comprises a heating device, a condensing reflux device, a temperature control device, a nitrogen gas flow control device, a display device and an automatic cleaning device; the heating device adopts multiple independent heating units; the condensing reflux device comprises a condensing device and a reflux device; the temperature control device mainly consists of a temperature sensor, a control circuit board, a heating control key, a function regulating key and a liquid crystal module; the nitrogen gas flow control device mainly consists of a mass flow controller, an A/D (D/A) module, a control circuit board, a function regulating key and a liquid crystal module; the automatic cleaning device consists of multiple independent cleaning units each of which comprises an independent vacuum pump, a solenoid valve and a cleaning pipe. Heating, digestion, reflux and absorption are integrally designed, operation is simple, convenient and practical, water resource is saved, working efficiency is improved, and automatic regulating and automatic cleaning of nitrogen gas flow are realized.
Description
Technical field
The present invention relates to one and clear up experiment pretreatment unit, belong to the technical field that chemical oxygen demand of high-chloride wastewater (COD) measures.
Background technology
" the mensuration heavy complex acid salt method of water chemical oxygen demand " (GB11914-89) regulation, this standard is not suitable for the brackish water that chloride ion-containing concentration is greater than 1000ml/L (after dilution).When chloride ion content is more than 1000ml/L, the minimum allowable value of COD is 250ml/L, and the accuracy lower than this value is just unreliable.Therefore, GB11914-89 is not suitable for wastewater containing high chlorid, as the COD in oil field waste measures, particularly through the oil extraction waste water (COD < 150ml/L) of purified treatment qualified discharge." the mensuration chlorine correction method of chemical oxygen demand of high-chloride wastewater " (HJ/T-2001) eliminates the interference that high chloride ion content measures COD, as one of methods for COD measurement in high-chlorine waste water.
Although traditional digestion instrument is feasible, also there is following shortcoming:
1, traditional high chlorine digestion instrument forms by heating, clearing up, reflux, absorb four parts, installs loaded down with trivial details, takes up room large, inconvenient operation.
2, heating arrangement is that electric furnace heating wire directly heats triangle and clears up bottle, very easily causes triangle to clear up bottle and bursts, thus cause short circuit, electric leakage, jeopardize the personal safety of operating personnel.
3, condensation reflux unit, needs tap water cool but can not recycle, causes the waste of water resource.
4, multiple sample can not be cleared up simultaneously, can only clear up by single stove monocyte sample.
5, in digestion process because temperature is uncontrollable, be heated uneven easy bumping.
6, clear up terminal cannot automatically stop, must special messenger guarding, inefficiency.
7, digestion process, the flow of nitrogen not easily regulates and instability of flow; Operator must regulate increasing nitrogen flow after having cleared up, and the time of nitrogen is led in timing.
8, after having tested, high chlorine digestion instrument needs manual cleaning, and intubate triangle clears up bottle and pipeline is not easy cleaning.
Summary of the invention
The present invention experimentally room high-chloride wastewater COD clear up working specification, on tradition high chlorine digestion instrument basis, in conjunction with the problems existed in reality, have developed applicable chlorine correction method, collection heats, clear up, reflux, be absorbed in the intelligent COD counteract appearance of novel all-in-one integrally, and it can realize, and single stove is cleared up automatically, heated at constant temperature, chilled water automatic cycle, nitrogen flow regulate automatically, automatic stopping heating after having cleared up, automatic cleaning, simple to operation.
Technical scheme of the present invention is as follows:
A kind of integral intelligent COD counteract appearance, it includes heating arrangement, condensation reflux unit, it is characterized in that: it also includes: attemperating unit, nitrogen flow control device, display device and automatic flushing device; Each several part concrete structure is as follows:
Heating arrangement: adopt multiple independently heating unit, each heating unit comprises ceramic electrothermal device, triangle clears up bottle, computer heating control button, status indicator lamp, control circuit board; Ceramic electrothermal device is fixed on before housing, is covered with stove frame above, and triangle is cleared up bottle and is placed on ceramic electrothermal device; Control desk is provided with status indicator lamp, function point analysis button and Liquid Crystal Module and multiple computer heating control button, and computer heating control, by the status indicator lamp shiny red corresponding to key control, controls corresponding ceramic electrothermal device simultaneously and starts heating and decompose;
Condensation reflux unit: it comprises condensing unit and reflux;
Condensing unit forms primarily of water tank, bulb condensation bottle and air cooler; Water tank is stainless steel, is provided with liquid level gauge, and the housing of instrument is provided with level window, can observe the liquid level in water tank; The structure of bulb condensation bottle comprises air intake, gas outlet, spherical condensation tube, water inlet, water delivering orifice; Condensate bottle universal clamp is fixed, and universal clamp is screwed in the fixed orifice of crossbeam, and crossbeam is fixed on housing; Air cooler is made up of condenser and axial flow blower, and recirculated water is through the copper pipe of condenser, and blower fan in instrument outer air, significantly reduces the temperature of recirculated water the heat Quick diffusing of recirculated water; Cooling circulating water from water tank through the water inlet of condensate bottle to water delivering orifice, then through air cooling system, finally get back to water tank;
Reflux clears up bottle, gas blow pipe, bulb condensation bottle, the sealing-plug of hollow, absorption bottle and part pipeline composition primarily of triangle; Air intake and the triangle of bulb condensation bottle are cleared up bottle sealing on bottle and are communicated with, and the gas outlet of bulb condensation bottle is communicated with the sealing-plug of hollow, and sealing-plug top to be sealed with absorption bottle by pipeline and is communicated with; Triangle is cleared up bottle side bottleneck and is sealed with gas blow pipe and be communicated with, and be communicated with through silicone tube quality of connection flow controller, the opposite side of mass flow controller is communicated with nitrogen interface by silicone tube.Clear up in reflux course, the chlorine that oxidized part chlorion generates by complexing non-in water sample is derived;
Attemperating unit: primarily of temperature sensor, control circuit board, computer heating control button, function point analysis button, Liquid Crystal Module composition; Temperature sensor is fixed on the inside of ceramic electrothermal device, is connected with control circuit board by signal wire, and ceramic electrothermal device real time temperature is passed to control circuit board, then is presented on Liquid Crystal Module by single-chip microcomputer by detected temperatures; By the computer heating control button on control desk, control the duty of each heating furnace; Design temperature, the setting-up time of heating-range mouth are set by function point analysis button;
Nitrogen flow control device: primarily of mass flow controller, A/D(D/A) module, control circuit board, function point analysis button, Liquid Crystal Module composition; Mass flow controller is fixed on box house, by signal wire and A/D(D/A) module, control circuit board be connected; Pass through A/D(D/A) module converts, by singlechip feedbsck to mass flow controller simulating signal, regulate the flow of nitrogen and be presented on Liquid Crystal Module; Flow and the time of key assignments nitrogen is pressed by function point analysis;
Display device: primarily of Liquid Crystal Module, control circuit board forms; Liquid Crystal Module is connected with control circuit board by winding displacement; Heating-up temperature, design temperature, heat time, setting-up time, present flow rate, setting flow are shown by Liquid Crystal Module, so that operator regulates design temperature, setting flow and setting-up time according to actual conditions;
Automatic flushing device: it is made up of multiple independently cleaning unit, cleaning unit quantity is consistent with heating unit quantity, and each cleaning unit comprises vacuum pump, solenoid valve, triangle clear up bottle, the sealing-plug of purge pipe, bulb condensation bottle, hollow, absorption bottle, vacuum pump control button, status indicator lamp, control circuit board and pipeline composition; Vacuum pump is fixed on enclosure interior, vacuum pump is connected with solenoid valve by silicone tube, solenoid valve connects purge pipe, purge pipe tube head and triangle are cleared up a bottle side bottle sealing and are communicated with, triangle is cleared up bottleneck on bottle and is sealed with air intake bottom bulb condensation bottle and be communicated with, gas outlet seals with the sealing-plug of hollow and is communicated with, and the mouth of pipe on sealing-plug to be sealed with absorption bottle by pipeline and is communicated with.When pressing vacuum pump and controlling button, status indicator lamp bright green, solenoid valve conduction, vacuum pump works, extract triangle out by purge pipe and clear up air generation negative pressure in bottle, the distilled water sucking-off that negative pressure will be injected in absorption bottle in advance, is injected triangle cleared up bottle, control button of upspringing after completing the cleaning of whole device by pipeline, sealing-plug, annular condenser pipe.
Major advantage of the present invention is as follows:
1, integrated design: by heating, clear up, reflux, absorb four partial design and be integrated, simple, convenient and practical.
2, security performance is good: under the state of heating, and ceramic electrothermal device does not affect by the globule, and the water on surface can evaporate, and can not affect the life-span.Even if there is the phenomenon that cucurbit bursts in still-process, also can not to be short-circuited, the accident such as electric leakage.
2, condensation reflux unit: replace tap water condensation with inner loop water condensation, can meet the condensation effect cleared up, again saves valuable water resource, improves work efficiency.
3, each heating furnace can independent heating: instrument is provided with multiple heating-range mouth, and has computer heating control button corresponding with it on the control panel, can clear up multiple sample simultaneously, also can clear up single sample according to the situation of sample; Because each stove mouth has independently heating control system, the temperature automatically controlled of single stove can be realized.
4, thermostatic control: in digestion process, the temperature of heating transmits signals to control circuit by temperature sensor, converts analog quantity to digital quantity and send single-chip microcomputer to by the A/D conversion chip on control circuit; Single-chip microcomputer internal processes adopts the proportion integration differentiation in automatic control mode (being called for short PID) to regulate, and response is fast, and tracking performance is good, can effectively suppress heating curves to vibrate.Difference according to heating-up temperature and design temperature changes heating current size, thus makes measuring tempeature trend towards set temperature value, realizes thermostatic control.
5, nitrogen flow regulates automatically: adopt mass flow controller to control the flow of nitrogen, precision is high, response is fast, good stability.In digestion process, the flow of nitrogen needs to control at 5-10ml/min; After having cleared up, need nitrogen flow at 30-40ml/min; Convert analog quantity to digital quantity by A/D module and pass to control circuit, control circuit, by setting the difference of flow and current flow, converts digital quantity to analog quantity by D/A module and accurately controls nitrogen flow.In experiment, nitrogen flow is stablized, and different flows can automatically switch, without the need to manual shift.
6, automatically clean: connect automatic flushing device, appropriate distilled water is added in absorption bottle, open the control button of vacuum self priming pump, moment triangular flask internal gas pressure decline, triangular flask is inner forms draught head with external atmosphere pressure, distilled water in absorption bottle flows to triangle by pipeline and clears up in bottle under draught head effect, closes the gauge tap of vacuum pump, completes the cleaning of whole device.
7, having cleared up automatic hold function: control chip internal processes is provided with time control unit, without the need to manually carrying out timing, after setting digestion time arrives, automatically having stopped heating.
Integral intelligent COD counteract appearance (chlorine correction method) can be widely used in the mensuration of COD in the waste water such as oil field, coastal refinery, oil depot, chlor-alkali plant, waste water deep sea emission.
Accompanying drawing explanation
Fig. 1 is front view of the present invention.
Fig. 2 is the left profile figure of Fig. 1.
Fig. 3 is the right sectional view of Fig. 1.
Fig. 4 is the right view of Fig. 1.
Fig. 5 is the structural representation of bulb condensation bottle.
Fig. 6 is the structural representation that triangle clears up bottle.
Fig. 7 is schematic diagram of the present invention.
1, sealing-plug 2, bulb condensation bottle 2.1, gas outlet 2.2, water delivering orifice 2.3, spherical condensation tube 2.4, water inlet 2.5, air intake 3, level window 4, gas blow pipe 5, triangle clears up bottle 5.1, upper bottleneck 5.2, side bottleneck 6, computer heating control button 7, vacuum pump controls button 8, status indicator lamp 9, Liquid Crystal Module 10, function point analysis button 11, control desk 12, absorption bottle 13, housing 14, purge pipe 15, temperature sensor 16, ceramic electrothermal device 17, stove frame 18, water tank 19, vacuum pump 20, solenoid valve 21, mass flow controller 22, condenser 23, axial flow blower 24, control circuit board 25, A/D (D/A) module 26, gauge tap 27, nitrogen interface.
Embodiment
Embodiment 1
As shown in Fig. 1,2,3,4,5,6,7, this integral intelligent COD counteract appearance, it comprises heating arrangement, condensation reflux unit, attemperating unit, nitrogen flow control device, display device, automatic flushing device.Each part is as follows:
Heating arrangement:
The ceramic electrothermal device of heating arrangement is fixed on before housing 13, is fixed with stove frame 17 above.Corresponding four ceramic electrothermal devices 16 can be put four triangles and clear up bottle 5, each ceramic electrothermal device 16 is connected with control circuit 24, whether four computer heating control buttons 6 that control desk 11 is connected with control circuit board 24 above control to heat, realize single-point single control function, indicate heated condition by status indicator lamp 8.By the function point analysis button 10 on control desk 11 can the temperature of sets itself ceramic electrothermal device, the time, setting interface can be shown by the Liquid Crystal Module 9 on control desk 11, convenient and simple for operation.
Condensation reflux unit: it comprises condensing unit and reflux;
Condensing unit forms primarily of water tank 18, bulb condensation bottle 2 and air cooler; Water tank is stainless steel, is provided with liquid level gauge, and the housing 13 of instrument is provided with level window 3, can observe the liquid level in water tank; The structure of bulb condensation bottle comprises air intake 2.5, gas outlet 2.1, spherical condensation tube 2.3, water inlet 2.4, water delivering orifice 2.2; Condensate bottle universal clamp is fixed, and universal clamp is screwed in the fixed orifice of crossbeam, and crossbeam is fixed on housing 13; Air cooler is made up of condenser 22 and axial flow blower 23, and recirculated water is through the copper pipe of condenser, and blower fan in instrument outer air, significantly reduces the temperature of recirculated water the heat Quick diffusing of recirculated water; Bulb condensation bottle 2 is provided with water inlet 2.4, water delivering orifice 2.2, for cooling water circulation.Four bulb condensation bottles are cascaded, the water inlet of first bulb condensation bottle is communicated with water tank 18, water delivering orifice is communicated with the water inlet of second bulb condensation bottle, the water delivering orifice of second bulb condensation bottle is communicated with the water inlet of the 3rd bulb condensation bottle, the water delivering orifice of the 3rd bulb condensation bottle is communicated with the water inlet of the 4th bulb condensation bottle, the water delivering orifice of the 4th bulb condensation bottle is communicated with condenser 22, finally gets back to water tank.Instrument shell 13 is provided with the liquid level that level window 3 is convenient to observe water tank 18, so that the liquid level of observing water tank supplements chilled water in time.
Reflux clears up bottle 5, gas blow pipe 4, bulb condensation bottle 2, the sealing-plug 1 of hollow, absorption bottle 12 and part pipeline composition primarily of triangle; Air intake 2.5 and the triangle of bulb condensation bottle are cleared up bottleneck 5.1 on bottle and are sealed and be communicated with, and the gas outlet 2.1 of bulb condensation bottle is communicated with the sealing-plug 1 of hollow, and sealing-plug top to be sealed with absorption bottle 12 by pipeline and is communicated with; Triangle is cleared up bottle 5 side bottleneck 5.2 and is sealed with gas blow pipe 4 and be communicated with, and be communicated with through silicone tube quality of connection flow controller 21, the opposite side of mass flow controller is communicated with nitrogen interface 27 by silicone tube.Clear up in reflux course, the chlorine that oxidized part chlorion generates by complexing non-in water sample is derived.
Attemperating unit: form primarily of temperature sensor 15, control circuit board 24, computer heating control button 6, function point analysis button 10, Liquid Crystal Module 9; Temperature sensor 15 is fixed on the inside of ceramic electrothermal device, is connected with control circuit board 24 by signal wire, and ceramic electrothermal device real time temperature is passed to control circuit board, then is presented on Liquid Crystal Module 9 by single-chip microcomputer by detected temperatures; By the computer heating control button 6 on control desk 11, control the duty of each heating furnace; Design temperature, the setting-up time of heating-range mouth are set by function point analysis button 10.
Nitrogen flow control device: primarily of mass flow controller 21, A/D(D/A) module 25, control circuit board 24, function point analysis button 10, Liquid Crystal Module 9 form; Mass flow controller is fixed on box house, by signal wire and A/D(D/A) module, control circuit board be connected; Pass through A/D(D/A) module converts, by singlechip feedbsck to mass flow controller simulating signal, regulate the flow of nitrogen and be presented on Liquid Crystal Module; Flow and the time of nitrogen is set by function point analysis button 10.
Display device: primarily of Liquid Crystal Module 9, control circuit board 24 forms; Liquid Crystal Module 9 is connected with control circuit board 24 by winding displacement; Heating-up temperature, design temperature, heat time, setting-up time, present flow rate, setting flow are shown by Liquid Crystal Module 9, so that operator regulates design temperature, setting flow and setting-up time according to actual conditions.
Automatic flushing device: it by four independently cleaning unit form, each cleaning unit comprises vacuum pump 19, solenoid valve 20, triangle clear up bottle 5, the sealing-plug 1 of purge pipe 14, bulb condensation bottle 2, hollow, absorption bottle 12, vacuum pump control button 7, status indicator lamp 8, control circuit board 24 and pipeline composition; Vacuum pump is fixed on enclosure interior, vacuum pump connects purge pipe 14 by silicone tube, solenoid valve, purge pipe tube head and triangle are cleared up bottle side bottleneck 5.2 and are sealed and be communicated with, triangle is cleared up bottleneck 5.1 on bottle and is sealed with air intake bottom condensate bottle 2.5 and be communicated with, the gas outlet 2.1 of condensate bottle seals with the sealing-plug 1 of hollow and is communicated with, and above sealing-plug, the mouth of pipe to be sealed with absorption bottle 12 by pipeline and is communicated with.
After experiment terminates, first cleared up bottle side bottleneck from triangle by gas blow pipe and take out and insert purge pipe tube head before cleaning, cleaning absorption bottle also injects appropriate distilled water.Connect automatic flushing device, the upper bottleneck 5.1 that air intake 2.5 bottom bulb condensation bottle 2 and triangle clear up bottle 3 seals and is communicated with, spherical condensation tube 2.3 through bulb condensation bottle 2 inside is provided with gas outlet 2.1 at condensate bottle top, gas outlet seals with the sealing-plug 1 of hollow and is communicated with, and to seal be communicated with through silicone tube with the absorption bottle 12 on right side.Triangle is cleared up bottle 5 side bottleneck 5.2 and is sealed with purge pipe 14 and be communicated with, and purge pipe is communicated with vacuum self priming pump 19 through solenoid valve 20, opens the control button of vacuum pump, simultaneously solenoid valve conduction.Triangular flask inside forms negative pressure, and the distilled water in absorption bottle is flow to triangle cleared up in bottle by pipeline, sealing-plug, spherical condensation tube under Negative Pressure Difference effect, completes the cleaning of whole device.
Claims (1)
1. an integral intelligent COD counteract appearance, it includes heating arrangement, condensation reflux unit, it is characterized in that: it also includes: attemperating unit, nitrogen flow control device, display device and automatic flushing device; Each several part concrete structure is as follows:
Heating arrangement: adopt multiple independently heating unit, each heating unit comprises ceramic electrothermal device (16), triangle clears up bottle (5), computer heating control button (6), status indicator lamp (8), control circuit board (24); Ceramic electrothermal device is fixed on before housing (13), is covered with stove frame (17) above, and triangle is cleared up bottle and is placed on ceramic electrothermal device; Control desk (11) is provided with status indicator lamp (8), function point analysis button (10) and Liquid Crystal Module (9) and multiple computer heating control button (6), and computer heating control, by the status indicator lamp corresponding to key control, controls corresponding ceramic electrothermal device simultaneously;
Condensation reflux unit: it comprises condensing unit and reflux;
Condensing unit forms primarily of water tank (18), bulb condensation bottle (2) and air cooler; Water tank is stainless steel, is provided with liquid level gauge, and the housing (13) of instrument is provided with level window (3), can observe the liquid level in water tank; The structure of bulb condensation bottle comprises air intake (2.5), gas outlet (2.1), spherical condensation tube (2.3), water inlet (2.4), water delivering orifice (2.2); Condensate bottle universal clamp is fixed, and universal clamp is screwed in the fixed orifice of crossbeam, and crossbeam is fixed on housing (13); Air cooler is made up of condenser (22) and axial flow blower (23), cooling circulating water from water tank through the water inlet of condensate bottle to water delivering orifice, then through air cooling system, finally get back to water tank;
Reflux clears up bottle (5), gas blow pipe (4), bulb condensation bottle (2), the sealing-plug (1) of hollow, absorption bottle (12) and part pipeline composition primarily of triangle; Air intake (2.5) and the triangle of bulb condensation bottle are cleared up bottleneck on bottle (5.1) and are sealed and be communicated with, and the gas outlet (2.1) of bulb condensation bottle is communicated with the sealing-plug (1) of hollow, and sealing-plug top to be sealed with absorption bottle (12) by pipeline and is communicated with; The side bottleneck (5.2) that triangle clears up bottle (5) seals with gas blow pipe (4) and is communicated with, and be communicated with through silicone tube quality of connection flow controller (21), the opposite side of mass flow controller is communicated with nitrogen interface (27) by silicone tube;
Attemperating unit: primarily of temperature sensor (15), control circuit board (24), computer heating control button (6), function point analysis button (10), Liquid Crystal Module (9) composition; Temperature sensor (15) is fixed on the inside of ceramic electrothermal device, is connected, ceramic electrothermal device real time temperature is passed to control circuit board by signal wire with control circuit board (24), then is presented on Liquid Crystal Module (9) by single-chip microcomputer by detected temperatures; By the computer heating control button (6) on control desk (11), control the duty of each heating furnace; Design temperature, the setting-up time of heating-range mouth are set by function point analysis button (10);
Nitrogen flow control device: primarily of mass flow controller (21), A/D(D/A) module (25), control circuit board (24), function point analysis button (10), Liquid Crystal Module (9) composition; Mass flow controller is fixed on box house, by signal wire and A/D(D/A) module, control circuit board be connected; Pass through A/D(D/A) module converts, by singlechip feedbsck to mass flow controller simulating signal, regulate the flow of nitrogen and be presented on Liquid Crystal Module; By flow and the time of function point analysis button (10) setting nitrogen;
Display device: primarily of Liquid Crystal Module (9), control circuit board (24) forms; Liquid Crystal Module (9) is connected with control circuit board (24) by winding displacement; Heating-up temperature, design temperature, heat time, setting-up time, present flow rate, setting flow are by Liquid Crystal Module (9) display;
Automatic flushing device: it is made up of multiple independently cleaning unit, each cleaning unit comprises vacuum pump (19), solenoid valve (20), triangle clear up bottle (5), the sealing-plug (1) of purge pipe (14), bulb condensation bottle (2), hollow, absorption bottle (12), vacuum pump control button (7), status indicator lamp (8), control circuit board (24) and pipeline composition; Vacuum pump is fixed on enclosure interior, vacuum pump is connected with solenoid valve by silicone tube, solenoid valve connects purge pipe (14), purge pipe tube head and triangle are cleared up a bottle side bottleneck (5.2) and are sealed and be communicated with, triangle is cleared up bottleneck on bottle (5.1) and is sealed with air intake (2.5) bottom bulb condensation bottle and be communicated with, the gas outlet (2.1) of bulb condensation bottle seals with the sealing-plug (1) of hollow and is communicated with, and the mouth of pipe on sealing-plug to be sealed with absorption bottle (12) by pipeline and is communicated with.
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| CN108414342A (en) * | 2018-02-10 | 2018-08-17 | 济南盛泰电子科技有限公司 | A kind of high-chloride wastewater COD resolutions instrument |
| CN108680525A (en) * | 2018-09-06 | 2018-10-19 | 江苏卓正环保科技有限公司 | A kind of total nitrogen automated monitor |
| CN114279809A (en) * | 2021-12-20 | 2022-04-05 | 广东贝源检测技术股份有限公司 | Digestion device for detecting COD in high-chlorine wastewater |
| CN114279809B (en) * | 2021-12-20 | 2024-02-06 | 广东贝源检测技术股份有限公司 | Digestion device for detecting COD in high-chlorine wastewater |
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Application publication date: 20160413 |