CN103149166A - Dual-wavelength ultraviolet method organic wastewater chemical oxygen demand (COD) detection device and method - Google Patents
Dual-wavelength ultraviolet method organic wastewater chemical oxygen demand (COD) detection device and method Download PDFInfo
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- CN103149166A CN103149166A CN2013100446893A CN201310044689A CN103149166A CN 103149166 A CN103149166 A CN 103149166A CN 2013100446893 A CN2013100446893 A CN 2013100446893A CN 201310044689 A CN201310044689 A CN 201310044689A CN 103149166 A CN103149166 A CN 103149166A
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Abstract
The invention discloses a dual-wavelength ultraviolet method organic wastewater chemical oxygen demand (COD) detection device and a method. In existing actual application, the problem of interference of suspended matter fluctuation in a water sample on absorbance generally exists in a forecast model, so that accuracy of the model is directly affected. A measuring groove is connected with a first monochromator, a second monochromator, an ultraviolet detector and a visible light detector, the first monochromator is connected with an ultraviolet light source, and the second monochromator is sequentially connected with a visible light source, a subtracter, an amplifying circuit, an alternating/direct (A/D) switching circuit, a programmable logic controller (PLC) control system and a display device. The dual-wavelength ultraviolet method organic wastewater COD detection device can accurately forecast COD value in the water sample, is full-automatic in measuring process, greatly shortens measuring period, improves COD measuring speed, improves suitable range and measuring precision, and can be suitable for on-line, rapid, and accurate analysis and measuring of wastewater COD.
Description
Technical field
The present invention relates to the waste water COD fields of measurement, relate in particular to a kind of dual wavelength ultraviolet method organic wastewater COD pick-up unit and method.
Background technology
The degree that chemical oxygen demand (COD) (COD) reflection water body is polluted by reductive organic matter is one of big event that must detect in water pollution monitoring and improvement, is also the important indicator of water quality assessment.Traditional C OD detects and refers to process waste water with strong oxidizer under certain condition, the amount of the strong oxidizer that in water, reducing substances consumes, and its result is converted to the content of oxygen.Its value is less, illustrates that water quality is contaminated lighter.
The COD measuring method of monitoring water environment is mainly potassium dichromate oxidation and Permanganate Index Method, both measurement results are relatively reliable, favorable reproducibility, medicament expends height, measuring period is long, continuous monitoring is difficult, waste liquid produces secondary pollution, the working service high in cost of production is not enough but exist.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of dual wavelength ultraviolet method organic wastewater COD pick-up unit and method are provided.
The present invention relates to a kind of dual wavelength ultraviolet method organic wastewater COD pick-up unit and method, comprise ultraviolet source, the first monochromator, visible light source, the second monochromator, measuring flume, ultraviolet detector, visible-light detector, subtracter, amplifying circuit, A/D change-over circuit, PLC control system, display device; Measuring flume is connected with the first monochromator, the second monochromator, ultraviolet detector, visible-light detector respectively, the first monochromator is connected with ultraviolet source, the second monochromator is connected with visible light source, and subtracter, amplifying circuit, A/D change-over circuit, PLC control system, display device are connected in turn.
Described measuring flume comprises ultraviolet light input path, ultraviolet detector light path, visible light input path, visible light detection light path, waste water water sample intake line, measures light beam, housing; The housing center is provided with the measurement light beam, measure in light beam and be provided with waste water water sample intake line, be provided with ultraviolet light input path, ultraviolet detector light path, visible light input path, visible light detection light path outside measuring light beam, visible light input path, visible light are surveyed light path on same light path, and ultraviolet light input path, ultraviolet detector light path are on same light path.
the water circuit system of described measuring flume comprises the first water pump P 1, the second water pump P 2, the 3rd water pump P 3, wastewater disposal basin, the first solenoid valve V1, the second solenoid valve V2, the 3rd solenoid valve V3, the 4th solenoid valve V4, the 5th solenoid valve V5, the 6th solenoid valve V6, the 7th solenoid valve V7, the 8th solenoid valve V8, the 9th solenoid valve V9, the tenth solenoid valve V10, waste water Measuring glass, pure water Measuring glass, mixing channel and pure water circulatory pool, the water inlet of described the first water pump P 1 is connected with the water delivering orifice of industry spot organic wastewater pipeline, the water delivering orifice of the first water pump P 1 is connected with the first water inlet of wastewater disposal basin, the anti-overflow outlet of wastewater disposal basin, the wastewater outlet of waste water Measuring glass is connected with industry spot organic wastewater pipeline, the bottom water delivering orifice of wastewater disposal basin is connected with industry spot organic wastewater pipeline by the first solenoid valve V1, the wastewater outlet of wastewater disposal basin is by the end of the V3 of the 4th solenoid valve V4 and the 3rd solenoid valve, one end of waste water Measuring glass connects, the water delivering orifice of waste water Measuring glass is by the end of the 5th solenoid valve V5 and the 6th solenoid valve V6, the water inlet of mixing channel connects, the second water pump P 2 water inlets are connected with the pure water pipeline, water delivering orifice is connected with the first water inlet of pure water circulatory pool, the water inlet of water delivering orifice the 3rd water pump P 3 of pure water circulatory pool connects, the water delivering orifice of the 3rd water pump P 3 respectively with the end of the 7th solenoid valve V7, the end of the 8th solenoid valve V8, the end of the second solenoid valve V2, the other end of the 3rd solenoid valve V3 is connected the second water inlet and is connected with the pure water circulatory pool, the other end of the 7th solenoid valve V7 is connected with the water inlet of pure water Measuring glass, the spillway of pure water Measuring glass is connected with the second water inlet of pure water circulatory pool, the water delivering orifice of pure water Measuring glass is connected with the other end of the 6th solenoid valve V6, the other end of the 8th solenoid valve V8 is connected with the water inlet of mixing channel, the water delivering orifice of mixing channel is connected with the water inlet of measuring flume by the 9th solenoid valve V9, the water delivering orifice of measuring flume is connected with industry spot organic wastewater pipeline by the tenth solenoid valve V10.
described subtraction circuit comprises three operational amplifiers and four resistance, the positive input of described the first operational amplifier A 1 is connected with the first voltage input end, the reverse input end of the first operational amplifier A 1 and output terminal, one end of the first resistance R 1 connects, one end of the other end of the first resistance R 1 and the second resistance R 2, the reverse input end of the 3rd operational amplifier A 3 connects, the positive input of the 3rd operational amplifier A 3 is connected as voltage output end with the other end of the second resistance R 2, the reverse input end of the second operational amplifier A 2 is connected with the second voltage input end, the output terminal of the reverse input end of the second operational amplifier A 2 and the second operational amplifier A 2, one end of the 3rd resistance R 3 connects, the positive input of the other end of the 3rd resistance R 3 and the 3rd operational amplifier, the 4th resistance R 4 connects, the other end ground connection of the 4th resistance R 4.
Described amplifying circuit comprises that nine resistance, power supply are held, four electric capacity, four diodes, three amplifier amplifiers, a field effect transistor, two switches and an inductance.the CE pin that end M occurs power supply is connected with an end of the 5th resistance R 5, one end of the other end of the 5th resistance R 5 and the first capacitor C 1, the output terminal of four-operational amplifier A4 connects, one end of the other end of the first capacitor C 1 and the 6th resistance R 6, one end of the 7th resistance R 7 connects, the RLC pin of end M occurs in the other end of the 6th resistance R 6 and power supply, one end of the first switch S 1 connects, the other end of the first switch S 1 is connected with the drain electrode of field effect transistor Q1, the grid of field effect transistor Q1 is connected with an end of the 8th resistance R 8, another termination power VCC of the 8th resistance R 8, the SE end of end occurs in the source electrode of field effect transistor Q1 and power supply, one end of the 11 resistance R 11 connects, the anode of the other end of the 11 resistance R 11 and the first diode D1, the negative electrode D3 of the 3rd diode, one end of the 12 resistance R 12, the reverse input end of the 5th operational amplifier A 5 connects, the positive input ground connection of the 5th operational amplifier A 5, positive supply termination+3V power supply, negative supply connects-the 3V power supply, the anodic bonding of the negative electrode of the first diode D1 and the second diode D2, the anode of the negative electrode of the second diode D2 and the 4th diode D4, the other end of the 12 resistance R 12, the output terminal of the 5th operational amplifier A 5, one end of the 13 resistance R 13 connects, the anodic bonding of the negative electrode of the 4th diode D4 and the 3rd diode D3, the reverse input end of the other end of the 13 resistance R 13 and the 6th operational amplifier A 6, one end of the 15 resistance R 15, one end of the 4th capacitor C 4 connects, the positive input ground connection of the 6th operational amplifier, positive supply termination+3V power supply, negative supply connects-the 3V power supply, output terminal is connected with the other end of the 4th capacitor C 4, an end of the 14 resistance R 14, the other end of the 14 resistance R 14 is connected with the other end of the 15 resistance R 15 and is connected with 2 pin of A/D conversion chip U3, and the other end of the 7th resistance R 7 is connected with the reverse input end of four-operational amplifier A4, the positive supply termination of four-operational amplifier A4+3V power supply, negative supply connects-the 3V power supply, the reverse input end of four-operational amplifier A4 is connected with an end of the 9th resistance R 9, the other end of the 9th resistance R 9 is connected with the movable end of three-pointswitch S2, another end of three-pointswitch S2 is connected with an end of the coil of the first inductance L 1, the tenth resistance R 10, and the other end of the tenth resistance R 10 is connected and ground connection with the end that also has of three-pointswitch S2, one termination power VCC of the first inductance L 1, other end ground connection, one termination of the second capacitor C 2+3V power supply, the other end are connected with an end of the 3rd capacitor C 3 and ground connection, another termination of the 3rd capacitor C 3-3V power supply.
Described A/D change-over circuit comprises 5V reference voltage chip U2REF5050 and A/D conversion chip U3LTC1864, four electric capacity; The end of the second electric capacity L2 is connected with power supply VCC, the other end is connected with an end of the 5th capacitor C 5, an end of the 6th capacitor C 6,2 pin of 5V reference voltage chip U2,4 pin of the other end of the other end of the 5th capacitor C 5, the 6th capacitor C 6,5V reference voltage chip U2 connect and ground connection, 6 pin of 5V reference voltage chip U2 are connected with 1 pin of an end of the 7th capacitor C 7, A/D conversion chip U3, all the other pins of 5V reference voltage chip U2 are built on stilts, the other end ground connection of the 7th capacitor C 7; 3 pin of A/D conversion chip U3 with connecing simulation, 4 pin connect digitally, 8 pin are connected with an end of the 8th capacitor C 8 and meet power supply VCC, 5 pin are connected with the ADCONV pin of PLC, 6 pin are connected with the ADDTA pin of PLC, 7 pin are connected with the ADCLK pin of PLC, the other end ground connection of the 8th capacitor C 8, the other end ground connection of the 8th capacitor C 8.
A kind of dual wavelength ultraviolet method organic wastewater COD detection method, the method comprises the following steps:
Step 1: open respectively ultraviolet source and visible light source, tested organic wastewater water sample is carried out the full wavelength scanner of ultraviolet light and two wave bands of visible light, scanning result is input to spectroanalysis instrument, define the organic waste water water sample at the single transmittance maximum absorption band of ultraviolet light wave band and visible light wave range according to its maximum absorption peak, and thus as measuring wavelength X
1With reference wavelength λ
2, and select to obtain the mensuration wavelength X
1With reference wavelength λ
2Two monochromators of correspondence;
Wherein in measuring flume, the obtaining step of water sample is: the first water pump P 1 will be from the organic wastewater water sample suction wastewater disposal basin that industry spot gathers, through after accumulating and precipitating, start the 4th solenoid valve V4, the waste water water sample is injected the waste water Measuring glass, quantitatively obtain the waste water water sample, meanwhile, sampling pump P2 injects the pure water circulatory pool with pure water, start solenoid valve V7, sampling pump P3 extracts quantitative pure water and injects the pure water Measuring glass.Start the 5th solenoid valve V5 and the 6th solenoid valve V6, make quantitative waste water water sample and pure water together inject mixing channel, to be mixed evenly after, start the 9th solenoid valve V9, water sample is injected in measuring flume.
The photosignal that step 4, ultraviolet light detector and visible-light detector obtain accesses respectively two input ends of subtraction circuit, obtains removing effective ultraviolet absorptivity value of suspension impact and the attenuation rate of visible light after doing poor the processing;
The useful signal of step 5, subtraction circuit output is input to amplifying circuit, and signal is amplified and denoising;
Beneficial effect: (1) can eliminate most suspended substances to the impact of absorbance due to the compensation of reference wavelength, when the fluctuation of the concentration of suspension of water sample is larger, can dope more exactly the COD value of water sample.
(2) realize the full process automatization of water sample extraction, measuring flume cleaning, instrument calibration and whole measurement based on the water-quality COD on-line measurement instrument of dual wavelength ultraviolet absorption process, greatly shortened the detection reagent time, improved the COD detection efficiency.
(3) according to actual water sample sweep measuring wavelength and reference wavelength, more meet the actual conditions that water sample has multiple pollutant and different extinction characteristics, enlarged the scope of application, improved measuring accuracy, can be suitable for all kinds of waste water CODs online, analyze fast and accurately and measure.
(4) do not need to have shortened measuring period through any Chemical Pretreatment, can not pollute environment simultaneously yet.Simultaneously, for eliminating the interference of suspension, adopt visible light to eliminate to suspension in water sample, can eliminate the Suspended Substance in Water Sample fluctuation absorbance is brought interference.
Description of drawings
Fig. 1 is system structure of device figure;
Fig. 2 (a) is the stereographic map of measuring flume;
Fig. 2 (b) is the vertical view of measuring flume;
Fig. 3 is water route one-piece construction figure;
Fig. 4 is subtraction circuit figure;
Fig. 5 is amplification circuit structure figure;
Fig. 6 is A/D converting circuit structure figure;
Fig. 7 is workflow diagram of the present invention.
Embodiment
As shown in Figure 1, a kind of dual wavelength ultraviolet method of the present invention organic wastewater COD pick-up unit comprises the long ultraviolet source of all-wave, the first monochromator, visible light source, the second monochromator, measuring flume, ultraviolet detector, visible-light detector, subtracter, amplifying circuit, A/D change-over circuit, PLC control system, display device; Measuring flume is connected with the first monochromator, the second monochromator, ultraviolet detector, visible-light detector respectively, the first monochromator is connected with ultraviolet source, the second monochromator is connected with visible light source, and subtracter, amplifying circuit, A/D change-over circuit, PLC control system, display device are connected in turn.
As shown in Fig. 2 (a), Fig. 2 (b), described measuring flume comprises ultraviolet light input path 1, ultraviolet detector light path 2, visible light input path 3, visible light detection light path 4, waste water water sample intake line 5, measures light beam 6, housing 7; Housing 7 centers are provided with measures light beam 6, measure in light beam 6 and be provided with waste water water sample intake line 5, measurement light beam 6 outsides are provided with ultraviolet light input path 1, ultraviolet detector light path 2, visible light input path 3, visible light detection light path 4, visible light input path 3, visible light are surveyed light path 4 on same light path, and ultraviolet light input path 1, ultraviolet detector light path 2 are on same light path.
as shown in Figure 3, the water circuit system of described measuring flume comprises the first water pump P 1, the second water pump P 2, the 3rd water pump P 3, wastewater disposal basin, the first solenoid valve V1, the second solenoid valve V2, the 3rd solenoid valve V3, the 4th solenoid valve V4, the 5th solenoid valve V5, the 6th solenoid valve V6, the 7th solenoid valve V7, the 8th solenoid valve V8, the 9th solenoid valve V9, the tenth solenoid valve V10, waste water Measuring glass, pure water Measuring glass, mixing channel and pure water circulatory pool, the water inlet of described the first water pump P 1 is connected with the water delivering orifice of industry spot organic wastewater pipeline, the water delivering orifice of the first water pump P 1 is connected with the first water inlet of wastewater disposal basin, the anti-overflow outlet of wastewater disposal basin, the wastewater outlet of waste water Measuring glass is connected with industry spot organic wastewater pipeline, the bottom water delivering orifice of wastewater disposal basin is connected with industry spot organic wastewater pipeline by the first solenoid valve V1, the wastewater outlet of wastewater disposal basin is by the end of the V3 of the 4th solenoid valve V4 and the 3rd solenoid valve, one end of waste water Measuring glass connects, the water delivering orifice of waste water Measuring glass is by the end of the 5th solenoid valve V5 and the 6th solenoid valve V6, the water inlet of mixing channel connects, the second water pump P 2 water inlets are connected with the pure water pipeline, water delivering orifice is connected with the first water inlet of pure water circulatory pool, the water inlet of water delivering orifice the 3rd water pump P 3 of pure water circulatory pool connects, the water delivering orifice of the 3rd water pump P 3 respectively with the end of the 7th solenoid valve V7, the end of the 8th solenoid valve V8, the end of the second solenoid valve V2, the other end of the 3rd solenoid valve V3 is connected the second water inlet and is connected with the pure water circulatory pool, the other end of the 7th solenoid valve V7 is connected with the water inlet of pure water Measuring glass, the spillway of pure water Measuring glass is connected with the second water inlet of pure water circulatory pool, the water delivering orifice of pure water Measuring glass is connected with the other end of the 6th solenoid valve V6, the other end of the 8th solenoid valve V8 is connected with the water inlet of mixing channel, the water delivering orifice of mixing channel is connected with the water inlet of measuring flume by the 9th solenoid valve V9, the water delivering orifice of measuring flume is connected with industry spot organic wastewater pipeline by the tenth solenoid valve V10.
as shown in Figure 4, described subtraction circuit comprises three operational amplifiers and four resistance, the positive input of described the first operational amplifier A 1 is connected with the first voltage input end, the reverse input end of the first operational amplifier A 1 and output terminal, one end of the first resistance R 1 connects, one end of the other end of the first resistance R 1 and the second resistance R 2, the reverse input end of the 3rd operational amplifier A 3 connects, the positive input of the 3rd operational amplifier A 3 is connected as voltage output end with the other end of the second resistance R 2, the reverse input end of the second operational amplifier A 2 is connected with the second voltage input end, the output terminal of the reverse input end of the second operational amplifier A 2 and the second operational amplifier A 2, one end of the 3rd resistance R 3 connects, the positive input of the other end of the 3rd resistance R 3 and the 3rd operational amplifier, the 4th resistance R 4 connects, the other end ground connection of the 4th resistance R 4.
As shown in Figure 5, described amplifying circuit comprise that nine resistance, power supply are held, four electric capacity, four diodes, three amplifier amplifiers, a field effect transistor, two switches and an inductance.the CE pin that end M occurs power supply is connected with an end of the 5th resistance R 5, one end of the other end of the 5th resistance R 5 and the first capacitor C 1, the output terminal of four-operational amplifier A4 connects, one end of the other end of the first capacitor C 1 and the 6th resistance R 6, one end of the 7th resistance R 7 connects, the RLC pin of end M occurs in the other end of the 6th resistance R 6 and power supply, one end of the first switch S 1 connects, the other end of the first switch S 1 is connected with the drain electrode of field effect transistor Q1, the grid of field effect transistor Q1 is connected with an end of the 8th resistance R 8, another termination power VCC of the 8th resistance R 8, the SE end of end occurs in the source electrode of field effect transistor Q1 and power supply, one end of the 11 resistance R 11 connects, the anode of the other end of the 11 resistance R 11 and the first diode D1, the negative electrode D3 of the 3rd diode, one end of the 12 resistance R 12, the reverse input end of the 5th operational amplifier A 5 connects, the positive input ground connection of the 5th operational amplifier A 5, positive supply termination+3V power supply, negative supply connects-the 3V power supply, the anodic bonding of the negative electrode of the first diode D1 and the second diode D2, the anode of the negative electrode of the second diode D2 and the 4th diode D4, the other end of the 12 resistance R 12, the output terminal of the 5th operational amplifier A 5, one end of the 13 resistance R 13 connects, the anodic bonding of the negative electrode of the 4th diode D4 and the 3rd diode D3, the reverse input end of the other end of the 13 resistance R 13 and the 6th operational amplifier A 6, one end of the 15 resistance R 15, one end of the 4th capacitor C 4 connects, the positive input ground connection of the 6th operational amplifier, positive supply termination+3V power supply, negative supply connects-the 3V power supply, output terminal is connected with the other end of the 4th capacitor C 4, an end of the 14 resistance R 14, the other end of the 14 resistance R 14 is connected with the other end of the 15 resistance R 15 and is connected with 2 pin of A/D conversion chip U3, and the other end of the 7th resistance R 7 is connected with the reverse input end of four-operational amplifier A4, the positive supply termination of four-operational amplifier A4+3V power supply, negative supply connects-the 3V power supply, the reverse input end of four-operational amplifier A4 is connected with an end of the 9th resistance R 9, the other end of the 9th resistance R 9 is connected with the movable end of three-pointswitch S2, another end of three-pointswitch S2 is connected with an end of the coil of the first inductance L 1, the tenth resistance R 10, and the other end of the tenth resistance R 10 is connected and ground connection with the end that also has of three-pointswitch S2, one termination power VCC of the first inductance L 1, other end ground connection, one termination of the second capacitor C 2+3V power supply, the other end are connected with an end of the 3rd capacitor C 3 and ground connection, another termination of the 3rd capacitor C 3-3V power supply.
As shown in Figure 6, described A/D change-over circuit comprises 5V reference voltage chip U2REF5050 and A/D conversion chip U3LTC1864, four electric capacity; The end of the second electric capacity L2 is connected with power supply VCC, the other end is connected with an end of the 5th capacitor C 5, an end of the 6th capacitor C 6,2 pin of 5V reference voltage chip U2,4 pin of the other end of the other end of the 5th capacitor C 5, the 6th capacitor C 6,5V reference voltage chip U2 connect and ground connection, 6 pin of 5V reference voltage chip U2 are connected with 1 pin of an end of the 7th capacitor C 7, A/D conversion chip U3, all the other pins of 5V reference voltage chip U2 are built on stilts, the other end ground connection of the 7th capacitor C 7; 3 pin of A/D conversion chip U3 with connecing simulation, 4 pin connect digitally, 8 pin are connected with an end of the 8th capacitor C 8 and meet power supply VCC, 5 pin are connected with the ADCONV pin of PLC, 6 pin are connected with the ADDTA pin of PLC, 7 pin are connected with the ADCLK pin of PLC, the other end ground connection of the 8th capacitor C 8, the other end ground connection of the 8th capacitor C 8.
As shown in Figure 7, a kind of dual wavelength ultraviolet method organic wastewater COD detection method, the method comprises the following steps:
Step 1: open respectively ultraviolet source and visible light source, tested organic wastewater water sample is carried out the full wavelength scanner of ultraviolet light and two wave bands of visible light, scanning result is input to spectroanalysis instrument, define the organic waste water water sample at the single transmittance maximum absorption band of ultraviolet light wave band and visible light wave range according to its maximum absorption peak, and thus as measuring wavelength X
1With reference wavelength λ
2, and select to obtain the mensuration wavelength X
1With reference wavelength λ
2Two monochromators of correspondence;
Wherein in measuring flume, the obtaining step of water sample is: the first water pump P 1 will be from the organic wastewater water sample suction wastewater disposal basin that industry spot gathers, through after accumulating and precipitating, start the 4th solenoid valve V4, the waste water water sample is injected the waste water Measuring glass, quantitatively obtain the waste water water sample, meanwhile, sampling pump P2 injects the pure water circulatory pool with pure water, start solenoid valve V7, sampling pump P3 extracts quantitative pure water and injects the pure water Measuring glass.Start the 5th solenoid valve V5 and the 6th solenoid valve V6, make quantitative waste water water sample and pure water together inject mixing channel, to be mixed evenly after, start the 9th solenoid valve V9, water sample is injected in measuring flume.
The photosignal that step 4, ultraviolet light detector and visible-light detector obtain accesses respectively two input ends of subtraction circuit, obtains removing effective ultraviolet absorptivity value of suspension impact and the attenuation rate of visible light after doing poor the processing;
The useful signal of step 5, subtraction circuit output is input to amplifying circuit, and signal is amplified and denoising;
Claims (7)
1. dual wavelength ultraviolet method organic wastewater COD pick-up unit, it is characterized in that: this device comprises ultraviolet source, the first monochromator, visible light source, the second monochromator, measuring flume, ultraviolet detector, visible-light detector, subtracter, amplifying circuit, A/D change-over circuit, PLC control system, display device; Measuring flume is connected with the first monochromator, the second monochromator, ultraviolet detector, visible-light detector respectively, the first monochromator is connected with ultraviolet source, the second monochromator is connected with visible light source, and subtracter, amplifying circuit, A/D change-over circuit, PLC control system, display device are connected in turn.
2. a kind of dual wavelength ultraviolet method organic wastewater COD pick-up unit according to claim 1 is characterized in that: described measuring flume comprises that ultraviolet light input path, ultraviolet detector light path, visible light input path, visible light survey light path, waste water water sample intake line, measure light beam, housing; The housing center is provided with the measurement light beam, measure in light beam and be provided with waste water water sample intake line, be provided with ultraviolet light input path, ultraviolet detector light path, visible light input path, visible light detection light path outside measuring light beam, visible light input path, visible light are surveyed light path on same light path, and ultraviolet light input path, ultraviolet detector light path are on same light path.
3. a kind of dual wavelength ultraviolet method organic wastewater COD pick-up unit according to claim 1, it is characterized in that: the water circuit system of described measuring flume comprises the first water pump P 1, the second water pump P 2, the 3rd water pump P 3, wastewater disposal basin, the first solenoid valve V1, the second solenoid valve V2, the 3rd solenoid valve V3, the 4th solenoid valve V4, the 5th solenoid valve V5, the 6th solenoid valve V6, the 7th solenoid valve V7, the 8th solenoid valve V8, the 9th solenoid valve V9, the tenth solenoid valve V10, waste water Measuring glass, pure water Measuring glass, mixing channel and pure water circulatory pool, the water inlet of described the first water pump P 1 is connected with the water delivering orifice of industry spot organic wastewater pipeline, the water delivering orifice of the first water pump P 1 is connected with the first water inlet of wastewater disposal basin, the anti-overflow outlet of wastewater disposal basin, the wastewater outlet of waste water Measuring glass is connected with industry spot organic wastewater pipeline, the bottom water delivering orifice of wastewater disposal basin is connected with industry spot organic wastewater pipeline by the first solenoid valve V1, the wastewater outlet of wastewater disposal basin is by the end of the V3 of the 4th solenoid valve V4 and the 3rd solenoid valve, one end of waste water Measuring glass connects, the water delivering orifice of waste water Measuring glass is by the end of the 5th solenoid valve V5 and the 6th solenoid valve V6, the water inlet of mixing channel connects, the second water pump P 2 water inlets are connected with the pure water pipeline, water delivering orifice is connected with the first water inlet of pure water circulatory pool, the water inlet of water delivering orifice the 3rd water pump P 3 of pure water circulatory pool connects, the water delivering orifice of the 3rd water pump P 3 respectively with the end of the 7th solenoid valve V7, the end of the 8th solenoid valve V8, the end of the second solenoid valve V2, the other end of the 3rd solenoid valve V3 is connected the second water inlet and is connected with the pure water circulatory pool, the other end of the 7th solenoid valve V7 is connected with the water inlet of pure water Measuring glass, the spillway of pure water Measuring glass is connected with the second water inlet of pure water circulatory pool, the water delivering orifice of pure water Measuring glass is connected with the other end of the 6th solenoid valve V6, the other end of the 8th solenoid valve V8 is connected with the water inlet of mixing channel, the water delivering orifice of mixing channel is connected with the water inlet of measuring flume by the 9th solenoid valve V9, the water delivering orifice of measuring flume is connected with industry spot organic wastewater pipeline by the tenth solenoid valve V10.
4. a kind of dual wavelength ultraviolet method organic wastewater COD pick-up unit according to claim 1, it is characterized in that: described subtraction circuit comprises three operational amplifiers and four resistance, the positive input of described the first operational amplifier A 1 is connected with the first voltage input end, the reverse input end of the first operational amplifier A 1 and output terminal, one end of the first resistance R 1 connects, one end of the other end of the first resistance R 1 and the second resistance R 2, the reverse input end of the 3rd operational amplifier A 3 connects, the positive input of the 3rd operational amplifier A 3 is connected as voltage output end with the other end of the second resistance R 2, the reverse input end of the second operational amplifier A 2 is connected with the second voltage input end, the output terminal of the reverse input end of the second operational amplifier A 2 and the second operational amplifier A 2, one end of the 3rd resistance R 3 connects, the positive input of the other end of the 3rd resistance R 3 and the 3rd operational amplifier, the 4th resistance R 4 connects, the other end ground connection of the 4th resistance R 4.
5. a kind of dual wavelength ultraviolet method organic wastewater COD pick-up unit according to claim 1 is characterized in that: described amplifying circuit comprises that nine resistance, power supply are held, four electric capacity, four diodes, three amplifier amplifiers, a field effect transistor, two switches and an inductance, the CE pin that end M occurs power supply is connected with an end of the 5th resistance R 5, one end of the other end of the 5th resistance R 5 and the first capacitor C 1, the output terminal of four-operational amplifier A4 connects, one end of the other end of the first capacitor C 1 and the 6th resistance R 6, one end of the 7th resistance R 7 connects, the RLC pin of end M occurs in the other end of the 6th resistance R 6 and power supply, one end of the first switch S 1 connects, the other end of the first switch S 1 is connected with the drain electrode of field effect transistor Q1, the grid of field effect transistor Q1 is connected with an end of the 8th resistance R 8, another termination power VCC of the 8th resistance R 8, the SE end of end occurs in the source electrode of field effect transistor Q1 and power supply, one end of the 11 resistance R 11 connects, the anode of the other end of the 11 resistance R 11 and the first diode D1, the negative electrode D3 of the 3rd diode, one end of the 12 resistance R 12, the reverse input end of the 5th operational amplifier A 5 connects, the positive input ground connection of the 5th operational amplifier A 5, positive supply termination+3V power supply, negative supply connects-the 3V power supply, the anodic bonding of the negative electrode of the first diode D1 and the second diode D2, the anode of the negative electrode of the second diode D2 and the 4th diode D4, the other end of the 12 resistance R 12, the output terminal of the 5th operational amplifier A 5, one end of the 13 resistance R 13 connects, the anodic bonding of the negative electrode of the 4th diode D4 and the 3rd diode D3, the reverse input end of the other end of the 13 resistance R 13 and the 6th operational amplifier A 6, one end of the 15 resistance R 15, one end of the 4th capacitor C 4 connects, the positive input ground connection of the 6th operational amplifier, positive supply termination+3V power supply, negative supply connects-the 3V power supply, output terminal is connected with the other end of the 4th capacitor C 4, an end of the 14 resistance R 14, the other end of the 14 resistance R 14 is connected with the other end of the 15 resistance R 15 and is connected with 2 pin of A/D conversion chip U3, and the other end of the 7th resistance R 7 is connected with the reverse input end of four-operational amplifier A4, the positive supply termination of four-operational amplifier A4+3V power supply, negative supply connects-the 3V power supply, the reverse input end of four-operational amplifier A4 is connected with an end of the 9th resistance R 9, the other end of the 9th resistance R 9 is connected with the movable end of three-pointswitch S2, another end of three-pointswitch S2 is connected with an end of the coil of the first inductance L 1, the tenth resistance R 10, and the other end of the tenth resistance R 10 is connected and ground connection with the end that also has of three-pointswitch S2, one termination power VCC of the first inductance L 1, other end ground connection, one termination of the second capacitor C 2+3V power supply, the other end are connected with an end of the 3rd capacitor C 3 and ground connection, another termination of the 3rd capacitor C 3-3V power supply.
6. a kind of dual wavelength ultraviolet method organic wastewater COD pick-up unit according to claim 1, it is characterized in that: described A/D change-over circuit comprises 5V reference voltage chip U2REF5050 and A/D conversion chip U3LTC1864, four electric capacity; The end of the second electric capacity L2 is connected with power supply VCC, the other end is connected with an end of the 5th capacitor C 5, an end of the 6th capacitor C 6,2 pin of 5V reference voltage chip U2,4 pin of the other end of the other end of the 5th capacitor C 5, the 6th capacitor C 6,5V reference voltage chip U2 connect and ground connection, 6 pin of 5V reference voltage chip U2 are connected with 1 pin of an end of the 7th capacitor C 7, A/D conversion chip U3, all the other pins of 5V reference voltage chip U2 are built on stilts, the other end ground connection of the 7th capacitor C 7; 3 pin of A/D conversion chip U3 with connecing simulation, 4 pin connect digitally, 8 pin are connected with an end of the 8th capacitor C 8 and meet power supply VCC, 5 pin are connected with the ADCONV pin of PLC, 6 pin are connected with the ADDTA pin of PLC, 7 pin are connected with the ADCLK pin of PLC, the other end ground connection of the 8th capacitor C 8, the other end ground connection of the 8th capacitor C 8.
7. dual wavelength ultraviolet method organic wastewater COD detection method, it is characterized in that: the method comprises the following steps:
Step 1: open respectively ultraviolet source and visible light source, tested organic wastewater water sample is carried out the full wavelength scanner of ultraviolet light and two wave bands of visible light, scanning result is input to spectroanalysis instrument, define the organic waste water water sample at the single transmittance maximum absorption band of ultraviolet light wave band and visible light wave range according to its maximum absorption peak, and thus as measuring wavelength X
1With reference wavelength λ
2, and select to obtain the mensuration wavelength X
1With reference wavelength λ
2Two monochromators of correspondence;
Step 2, open ultraviolet source and visible light source, the ultraviolet light and the visible light that respectively light source are sent through two monochromators filter, and obtain the λ that wavelength is
1And λ
2Ultraviolet light and visible light;
Step 3, this two bundles single wavelength light is shone respectively waste water water sample in measuring flume: ultraviolet light is along injecting in measuring flume perpendicular to measuring the cell wall direction, and passes measuring flume, obtains photosignal by UV photodetector; Visible light obtains photosignal along inciding in measuring flume perpendicular to measuring cell wall direction and ultraviolet light incident direction by visible-light detector;
Wherein in measuring flume, the obtaining step of water sample is: the first water pump P 1 will be from the organic wastewater water sample suction wastewater disposal basin that industry spot gathers, through after accumulating and precipitating, start the 4th solenoid valve V4, the waste water water sample is injected the waste water Measuring glass, quantitatively obtain the waste water water sample, meanwhile, sampling pump P2 injects the pure water circulatory pool with pure water, start solenoid valve V7, sampling pump P3 extracts quantitative pure water and injects the pure water Measuring glass; Start the 5th solenoid valve V5 and the 6th solenoid valve V6, make quantitative waste water water sample and pure water together inject mixing channel, to be mixed evenly after, start the 9th solenoid valve V9, water sample is injected in measuring flume;
The photosignal that step 4, ultraviolet light detector and visible-light detector obtain accesses respectively two input ends of subtraction circuit, obtains removing effective ultraviolet absorptivity value of suspension impact and the attenuation rate of visible light after doing poor the processing;
The useful signal of step 5, subtraction circuit output is input to amplifying circuit, and signal is amplified and denoising;
Step 6, the access of the signal after amplifying A/D change-over circuit make simulating signal can convert digital signal to and directly supply the PLC control system used, carry out that data are processed, storage and showing.
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| CN105510250A (en) * | 2015-11-25 | 2016-04-20 | 中国科学院南海海洋研究所 | Water body light absorption and attenuation coefficients measurement method |
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| CN108614496A (en) * | 2018-06-19 | 2018-10-02 | 芜湖市新海域智能科技有限公司 | A kind of COD value remote monitoring system for detecting organic matter of sewage overall target |
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| 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 |
| CN109270014A (en) * | 2018-09-28 | 2019-01-25 | 东南大学 | Water quality automonitor and monitoring method under a kind of multifunctional water |
| CN113655011A (en) * | 2021-10-20 | 2021-11-16 | 武汉新烽光电股份有限公司 | Microfluidic detection system and detection method thereof |
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| CN107976405A (en) * | 2017-12-25 | 2018-05-01 | 四川大学 | A kind of device that on-line monitoring river pollution is realized by light reaction |
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| CN108120692A (en) * | 2018-01-18 | 2018-06-05 | 南通艾森传感技术有限公司 | Portable COD monitors |
| CN108614496A (en) * | 2018-06-19 | 2018-10-02 | 芜湖市新海域智能科技有限公司 | A kind of COD value remote monitoring system for detecting organic matter of sewage overall target |
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