CN201689046U - Ultraviolet absorption COD monitor - Google Patents
Ultraviolet absorption COD monitor Download PDFInfo
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- CN201689046U CN201689046U CN2010201419683U CN201020141968U CN201689046U CN 201689046 U CN201689046 U CN 201689046U CN 2010201419683 U CN2010201419683 U CN 2010201419683U CN 201020141968 U CN201020141968 U CN 201020141968U CN 201689046 U CN201689046 U CN 201689046U
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Abstract
The utility model discloses an ultraviolet absorption COD monitor, which comprises a peristaltic pump. A cuvette and a sampling cleaning valve are respectively in pipe connection with an outlet and an inlet of the peristaltic pump, a semi-reflecting semi-transmitting lens is arranged on one side of the cuvette, the semi-reflecting semi-transmitting lens can exactly receive light which is emitted by a light source and transmits through the cuvette, the semi-reflecting semi-transmitting lens can divide the light emitted by the light source into ultraviolet reflecting light and visible transmission light, an ultraviolet detector arranged on one side of a lens surface of the semi-reflecting semi-transmitting lens can exactly receive the ultraviolet reflecting light of the semi-reflecting semi-transmitting lens, and a visible light detector arranged on one side of a lens back of the semi-reflecting semi-transmitting lens can exactly receive the visible transmission light of the semi-reflecting semi-transmitting lens. The ultraviolet absorption COD monitor has the advantages of high light source energy use rate, rich detection wave lengths, high light splitting efficiency and capability of effectively eliminating the influence of turbidity and chromaticity on COD concentration detection using an ultraviolet absorption method.
Description
Technical field
The utility model relates to a kind of environment monitor, especially relates to a kind of ultraviolet absorption method COD monitor of measuring at the ultraviolet absorptivity of industrial waste water, surface water or ground water chemistry oxygen demand (COD).
Background technology
Chemical oxygen demand (COD) (COD) is the key index that the environmental protection parts are understood the water pollution situation, and for the monitoring of COD, the chemical reaction method that tradition is used requires under the conditions such as high temperature, strong oxidizer strong acid.The general structure of this quasi-instrument is multiple, measuring period is long, have secondary pollution, failure rate height.
Between a large amount of absorbances that studies show that ultraviolet 254nm wavelength and the COD better linearity correlativity is arranged,, just can calculate the concentration of COD in the water outlet therefore by the 254nm absorbance of measuring samples.Japanese Industrial Standards (JIS) was determined water quality monitoring ultraviolet absorptivity method, and the ultraviolet absorptivity value is associated with the COD value, and China has also put into effect the standard HJ/T191-2005 of uv absorption water quality automatic on-line monitoring instrument in 2005.Adopt ultraviolet absorption method to measure advantages such as COD content has convenient, fast non-secondary pollution in the water quality, safeguard simply, failure rate is low.But the pick-up unit of measuring absorbance at present exists the energy of light source utilization factor low, and it is single to detect wavelength, and spectroscopical effeciency is low, can't eliminate shortcomings such as turbidity and colourity influence.
Summary of the invention
At problem set forth above, the utility model purpose is to provide a kind of measuring accuracy high and rectilinearity is good, can eliminate turbidity and colourity in the water detect the influence that causes to COD the ultraviolet absorption method COD monitor based on COD concentration in the ultraviolet absorptivity mensuration detection water.
The utility model is realized by following technical measures, a kind of ultraviolet absorption method COD monitor, comprise peristaltic pump, the gateway of peristaltic pump is divided no matter is connected to cuvette and sampling cleaning valve, the outlet of described cuvette is connected to waste liquid tank, two inlets of described sampling cleaning valve divide no matter are connected to the sampling selector valve proofreaies and correct valve with cleaning, two inlets of described sampling selector valve divide no matter are connected to online water sample jar and off-line water sample jar, described cleaning is proofreaied and correct two inlet branches of valve no matter is connected to cleaning fluid tank and range flow container, one side of described cuvette is provided with the light source that can penetrate the light that sees through cuvette, one side of described cuvette is provided with to fit and can receives the half-reflecting half mirror that light source penetrated and saw through the light of cuvette, the light that this half-reflecting half mirror can send light source is divided into two bundles, a branch of is ultraviolet reflection light, another bundle is a visible light transmission light, minute surface one side of described half-reflecting half mirror is provided with a ultraviolet detector that just in time can receive half-reflecting half mirror ultraviolet reflection light, the mirror of half-reflecting half mirror is carried on the back a side and is provided with a visible light detector that just in time can receive half-reflecting half mirror visible light transmission light, described peristaltic pump, the sampling cleaning valve, the sampling selector valve, clean and proofread and correct valve, light source, ultraviolet detector and visible light detector all are connected electrically on the controller.
The preferred diaphragm type two-position three way magnetic valve of valve is proofreaied and correct in above-mentioned sampling cleaning valve, sampling selector valve and cleaning; Light source preferred lower pressure mercury lamp; The material preferred molten quartz of cuvette; Half-reflecting half mirror preferably 220-350nm wave band reflectivity greater than 90% and 500-1000nm wave band transmitance greater than 90% half-reflecting half mirror.
The utility model selects 254nm as measuring wave band at ultraviolet region; Select 546nm as measuring wave band in visibility region.The absorbance at 546nm place is as turbidity and colourity corrected parameter.
The explanation of COD Measurement Algorithm:
Represent total absorbance with a, it comprises the absorbance A that COD causes
CThe absorbance A that causes with turbidity
Ta＝A
C+A
T。The light of two wavelength of apparatus measures, the absorbance a of corresponding two wavelength
254And a
546Turbidity all has effect to 254nm and 546nm, promptly
COD only works to 254nm, 546nm is not produced absorption, promptly
So have:
COD concentration is directly proportional with its absorbance at the 254nm place, and related coefficient is greater than 0.99; Turbidity is directly proportional with its absorbance at 254nm and 546nm place, and related coefficient is all greater than 0.99.
Given value: the COD value of range mark liquid is made as COD
Amount, treat evaluation: the absorbance a of water sample
254 SampleAnd a
546 Sample, the turbidity TUR of water sample
Sample, the COD of water sample
Sample
Measured value:
Representing the optical signal value measured with I, is exactly the original value that converts electric signal in instrument.
Three kinds of water of apparatus measures, the one, clear water (distilled water that does not promptly contain COD and turbidity), the 2nd, range mark liquid (COD that contains normal concentration does not contain turbidity), the 3rd, water sample (water in the actual field contains the COD and the turbidity of unknown concentration).
Optical signal value when measuring clear water: I
546 Clearly, I
254 Clearly
Optical signal value when measuring journey mark liquid: I
546 Amount, I
254 Amount
Optical signal value when measuring water sample: I
546 Sample, I
254 Sample
Range mark liquid absorbance: A
546 Amount, A
254 Amount
Calculation procedure:
Calculate the absorbance of range mark liquid:
Calculate the absorbance and the COD of water sample:
By water sample turbidity TUR
SampleCan calculate A
524 Sample T, the two is linear,
By a
254 SampleAnd A
254 Sample TCan calculate A
254 Sample C
By A
254 Sample CCan calculate the COD value COD of water sample
Sample, the two is linear.
1, measures I
546 ClearlyI
254 Clearly
2, measure
3, measure
The utility model uses the light splitting technology of half-reflecting half mirror, half-reflecting half mirror can reflect most ultraviolet lights, transmission overwhelming majority visible light, can use different half-reflecting half mirrors to measure different wave bands, the utlity model has energy of light source utilization factor height, the detection wavelength is abundant, and the spectroscopical effeciency height can effectively be eliminated turbidity and colourity detect COD concentration to ultraviolet absorption method influence.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
A kind of ultraviolet absorption method COD monitor by measuring the absorbance of 254nm wavelength UV (ultraviolet ray), is measured organic pollutants and the instrument that absorbs the UV material in the water, comprising:
Light source 9: launch ultraviolet and visible light, be used to measure the absorbance of various kinds liquid;
Cuvette 1: deposit the device of sample liquid to be measured, the light path of absorption cell is 10mm under the standard configuration situation.Can match the absorption cell of different light paths, to improve measurement range;
Half-reflecting half mirror 4: be used for the light that light source sends is divided into two bundles, a branch of is ultraviolet (reflected light), and another bundle is visible light (transmitted light);
Ultraviolet detector 2: be used to detect the ultraviolet absorbance of 254nm;
Visible light detector 3: the absorbance that is used to detect the 546nm visible light;
Peristaltic pump 11: various kinds liquid to be measured is drawn in the cuvette 1;
Solenoid valve: instrument internal has three diaphragm type two-position three way magnetic valves, is respectively: valve 6 is proofreaied and correct in sampling cleaning valve 12, sampling selector valve 13, cleaning.Three interfaces are all arranged, be respectively normal opening, normally closed port and common port, the common port of sampling selector valve 13 links to each other with sampling cleaning valve 12 normal openings, cleans the common port of proofreading and correct valve 6 and links to each other with sampling cleaning valve 12 normally closed port, and sampling cleaning valve 12 common port link to each other with peristaltic pump 11;
The sample flow container: online water sample jar 14 is used to store online water sample, and off-line water sample jar 15 is used to be stored in the off-line water sample, and cleaning fluid tank 7 is used to store cleaning fluid, and range flow container 8 is used to store range liquid;
Waste liquid tank 5: be used to collect the waste liquid of discharging by cuvette 1;
Controller 10: control sampling cleaning valve 12, sampling selector valve 13, clean the switch of proofreading and correct valve 6, peristaltic pump 11 and light source 9 according to pre-set programs, and the signal of ultraviolet detector 2 and visible light detector 3 collections is stored and handled.
Extract online sample: sampling cleaning valve 12, sampling selector valve 13 and cleaning are proofreaied and correct valve 6 and all are in closed condition;
Extract the off-line sample: sampling cleaning valve 12, cleaning are proofreaied and correct valve 6 and are in closed condition, and sampling selector valve 13 is in open mode;
Extract cleaning fluid: sampling cleaning valve 12 is in open mode, and sampling selector valve 13, cleaning are proofreaied and correct valve 6 and be in closed condition;
Extract range liquid: sampling cleaning valve 12, cleaning are proofreaied and correct valve 6 and are in open mode, and sampling selector valve 13 is in closed condition;
Waste collection: the waste liquid after all measurements are finished is all collected in the waste liquid tank 5 of instrument bottom, and the user needs according to survey frequency periodic cleaning waste liquid.
Control the process of measurement step of carrying out by controller 10:
1) opens sampling cleaning valve 12;
2) cleaning fluid is extracted in peristaltic pump 11 work;
3) peristaltic pump 11 quits work, and closes sampling cleaning valve 12, carries out light signal collection;
4) omit this step as being set to online sampling, since the 5th step.As be set to the off-line sampling, open sampling selector valve 13;
5) water sample is extracted in peristaltic pump 11 work;
6) peristaltic pump 11 quits work, and (be set to the off-line sampling, then close sampling selector valve 13) carries out light signal collection;
7) open sampling cleaning valve 12, peristaltic pump 11 work, extract cleaning fluid;
8) peristaltic pump 11 quits work, and closes sampling cleaning valve 12, and process of measurement is finished.
Control the correction program step of carrying out by controller:
1) opens sampling cleaning valve 12;
2) cleaning fluid is extracted in peristaltic pump 11 work;
3) peristaltic pump 11 quits work, and closes sampling cleaning valve 12, carries out light signal collection;
4) open sampling cleaning valve 12, sampling selector valve 13;
5) correcting fluid is extracted in peristaltic pump 11 work;
6) peristaltic pump 11 quits work, and closes sampling cleaning valve 12, sampling selector valve 13, carries out light signal collection;
7) if mark liquid 1 is set to be equated with mark liquid 2 concentration, then directly entered for the 8th step.Do not wait with mark liquid 2 concentration if mark liquid 1 is set, then repeat the 4-6 step;
8) open sampling cleaning valve 12, peristaltic pump 11 work, extract cleaning fluid peristaltic pump 11 and quit work, close sampling cleaning valve 12.
More than be that the structure and the working method of the utility model ultraviolet absorption method COD monitor are set forth; be used for helping to understand the utility model; but embodiment of the present utility model is not restricted to the described embodiments; anyly do not deviate from the change done under the utility model principle, modification, substitute, combination, simplify; all should be the substitute mode of equivalence, be included within the protection domain of the present utility model.
Claims (5)
1. ultraviolet absorption method COD monitor, it is characterized in that: comprise peristaltic pump, the gateway of peristaltic pump is divided no matter is connected to cuvette and sampling cleaning valve, the outlet of described cuvette is connected to waste liquid tank, two inlets of described sampling cleaning valve divide no matter are connected to the sampling selector valve proofreaies and correct valve with cleaning, two inlets of described sampling selector valve divide no matter are connected to online water sample jar and off-line water sample jar, described cleaning is proofreaied and correct two inlet branches of valve no matter is connected to cleaning fluid tank and range flow container, one side of described cuvette is provided with the light source that can penetrate the light that sees through cuvette, one side of described cuvette is provided with to fit and can receives the half-reflecting half mirror that light source penetrated and saw through the light of cuvette, the light that this half-reflecting half mirror can send light source is divided into two bundles, a branch of is ultraviolet reflection light, another bundle is a visible light transmission light, minute surface one side of described half-reflecting half mirror is provided with a ultraviolet detector that just in time can receive half-reflecting half mirror ultraviolet reflection light, the mirror of half-reflecting half mirror is carried on the back a side and is provided with a visible light detector that just in time can receive half-reflecting half mirror visible light transmission light, described peristaltic pump, the sampling cleaning valve, the sampling selector valve, clean and proofread and correct valve, light source, ultraviolet detector and visible light detector all are connected electrically on the controller.
2. ultraviolet absorption method COD monitor according to claim 1 is characterized in that: it all is the diaphragm type two-position three way magnetic valve that valve is proofreaied and correct in described sampling cleaning valve, sampling selector valve and cleaning.
3. ultraviolet absorption method COD monitor according to claim 1 is characterized in that: described light source is a low pressure mercury lamp.
4. ultraviolet absorption method COD monitor according to claim 1 is characterized in that: the material of described cuvette is a fused quartz.
5. ultraviolet absorption method COD monitor according to claim 1 is characterized in that: described half-reflecting half mirror for 220-350nm wave band reflectivity greater than 90% and 500-1000nm wave band transmitance greater than 90% half-reflecting half mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201419683U CN201689046U (en) | 2010-03-24 | 2010-03-24 | Ultraviolet absorption COD monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201419683U CN201689046U (en) | 2010-03-24 | 2010-03-24 | Ultraviolet absorption COD monitor |
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|---|---|
| CN201689046U true CN201689046U (en) | 2010-12-29 |
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| CN2010201419683U Expired - Lifetime CN201689046U (en) | 2010-03-24 | 2010-03-24 | Ultraviolet absorption COD monitor |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809544A (en) * | 2012-07-24 | 2012-12-05 | 广州市怡文环境科技股份有限公司 | On-line automatic monitor for total lead |
| CN104807768A (en) * | 2015-05-18 | 2015-07-29 | 南京大学 | Water body nitrobenzol content measuring device and measuring method |
| CN104897598A (en) * | 2015-06-15 | 2015-09-09 | 南京大学 | Water quality COD spectral measurement device and measurement method |
| CN108007877A (en) * | 2016-10-28 | 2018-05-08 | 中国石油化工股份有限公司 | Application of the cold cathode UV lamp in purple light spectrophotometric side measurement COD value |
| CN109142260A (en) * | 2018-09-26 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of Ultraviolet Photometric Method COD online analyzer and its working method |
| CN110542680A (en) * | 2019-07-16 | 2019-12-06 | 华南理工大学 | Portable wastewater COD detection device based on 3D printing paper base and manufacturing and measuring method |
| CN110687057A (en) * | 2018-07-04 | 2020-01-14 | 中国科学院深圳先进技术研究院 | Water in-situ detection device |
| CN115586316A (en) * | 2022-12-06 | 2023-01-10 | 江苏盛奥华环保科技有限公司 | Water quality analyzer inspection and calibration method |
| CN117074345A (en) * | 2023-10-16 | 2023-11-17 | 山东风途物联网科技有限公司 | Detection and calibration method for optical equipment for water quality detection |
| CN117420091A (en) * | 2023-12-19 | 2024-01-19 | 河北德润厚天科技股份有限公司 | Method and equipment for detecting quality of purified water |
-
2010
- 2010-03-24 CN CN2010201419683U patent/CN201689046U/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809544A (en) * | 2012-07-24 | 2012-12-05 | 广州市怡文环境科技股份有限公司 | On-line automatic monitor for total lead |
| CN102809544B (en) * | 2012-07-24 | 2016-01-20 | 广州市怡文环境科技股份有限公司 | Total plumbous online automatic monitor |
| CN104807768A (en) * | 2015-05-18 | 2015-07-29 | 南京大学 | Water body nitrobenzol content measuring device and measuring method |
| CN104807768B (en) * | 2015-05-18 | 2017-07-04 | 南京大学 | Water body nitrobenzene measurement apparatus and measuring method |
| CN104897598A (en) * | 2015-06-15 | 2015-09-09 | 南京大学 | Water quality COD spectral measurement device and measurement method |
| CN104897598B (en) * | 2015-06-15 | 2017-07-04 | 南京大学 | The spectral measurement device and measuring method of water-quality COD |
| CN108007877A (en) * | 2016-10-28 | 2018-05-08 | 中国石油化工股份有限公司 | Application of the cold cathode UV lamp in purple light spectrophotometric side measurement COD value |
| CN110687057A (en) * | 2018-07-04 | 2020-01-14 | 中国科学院深圳先进技术研究院 | Water in-situ detection device |
| CN109142260A (en) * | 2018-09-26 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of Ultraviolet Photometric Method COD online analyzer and its working method |
| CN110542680A (en) * | 2019-07-16 | 2019-12-06 | 华南理工大学 | Portable wastewater COD detection device based on 3D printing paper base and manufacturing and measuring method |
| CN110542680B (en) * | 2019-07-16 | 2021-07-20 | 华南理工大学 | Portable wastewater COD detection device based on 3D printing paper base and manufacturing and measuring method |
| CN115586316A (en) * | 2022-12-06 | 2023-01-10 | 江苏盛奥华环保科技有限公司 | Water quality analyzer inspection and calibration method |
| CN117074345A (en) * | 2023-10-16 | 2023-11-17 | 山东风途物联网科技有限公司 | Detection and calibration method for optical equipment for water quality detection |
| CN117074345B (en) * | 2023-10-16 | 2024-01-16 | 山东风途物联网科技有限公司 | Detection and calibration method for optical equipment for water quality detection |
| CN117420091A (en) * | 2023-12-19 | 2024-01-19 | 河北德润厚天科技股份有限公司 | Method and equipment for detecting quality of purified water |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20101229 |
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| CX01 | Expiry of patent term |