CN101865837B - Portable chemical COD/BOD (Chemical Oxygen Demand/Biological Oxygen Demand) analyzer and application method thereof - Google Patents
Portable chemical COD/BOD (Chemical Oxygen Demand/Biological Oxygen Demand) analyzer and application method thereof Download PDFInfo
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- CN101865837B CN101865837B CN2010102122804A CN201010212280A CN101865837B CN 101865837 B CN101865837 B CN 101865837B CN 2010102122804 A CN2010102122804 A CN 2010102122804A CN 201010212280 A CN201010212280 A CN 201010212280A CN 101865837 B CN101865837 B CN 101865837B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention relates to a portable chemical COD/BOD (Chemical Oxygen Demand/Biological Oxygen Demand) analyzer and an application method thereof. The analyzer comprises a computer-controlled ultraviolet scanning spectrophotometer and is characterized by also comprising an aeration digestion system and an active sludge treatment system; the aeration dispelling system comprises a digester and a portable incubator; the portable incubator is internally provided with active sludge which contains dominant bacteria to be cultured and acclimated by using measured sewage; the digester and the incubator are both provided a computer-controlled independent embedded type control system; and the active sludge treatment system is a high-speed revolution separator used for recycling the active sludge after separating the active sludge and the sewage. The invention has wide adaptation range, wide measurement concentration range, no intoxication, simple operation and easy mastering, can measure the COD/BOD by one machine and accords with the situation of complex and variable constitutes of wastewater in China.
Description
Technical field
The present invention relates to a kind of portable chemical oxygen utilization and BOD analyser and method of application thereof.
Background technology
COD (COD) is meant the method for expressing of oxygen equivalent of the organic contaminant of available chemical method oxidation in the water, representes with mg/L.The chemical oxygen demand quantitative response degree that polluted by reducing substances, reducing substances comprises organism, nitrite, ferrous salt, sulfide etc. in the water.
Existing portable COD analyser basically based on clearing up AAS fast, is to measure Cr
2O
7On the transition of lone pair electrons, receive Cr
3+And Cr
6+Interference, and based on Cr
3+And Cr
6+Specific wavelength be respectively the absorption at 610nm or 320nm place.Because organism complicacy and change in concentration in the water are prone to deviation with the detected value of this method.
Organism required oxygen amount when microorganism is decomposed is the important indicator of necessary mensuration in environmental monitoring and the wastewater treatment in biochemical oxygen demand (BOD) the expression water.At present the standard testing analytical approach BOD5 method used till today of countries in the world needs to cultivate through 5 days under 20 ℃ of conditions, measures dissolved oxygen DO poor of 5 days front and back.Because influence factor is various when measuring, and brings many difficulties to practical application, particularly wastewater treatment control engineering need draw data fast, carries out closed loop management.
In recent years, domestic and international research main method to the BOD analyzer has: 1, Hua Boshi respirometer 2, electric coulometer; 3, differential pressure gauge; 4, DO instrumental method; 5, microbial film oxygen electrode method; 6, aeration type oxygen electrode method, preceding 4 kinds also need five, and the 5th kind of its film is prone to poison, and is not suitable for domestic complicated waste water, the 6th kind of poor repeatability, linearity is not high.
Summary of the invention
Technical matters to be solved by this invention provides a kind of portable chemical oxygen utilization and BOD analyser and method of application thereof, and a machine can be measured chemical oxygen consumption (COC) and BOD (COD/BOD), and is simple to operate, be easy to grasp.
Technical matters to be solved by this invention realizes through following technical scheme:
A kind of portable chemical oxygen utilization and BOD analyser comprise Computer Control Unit and UV scanning spectrophotometer, it is characterized in that: said analyser also comprises clears up aerating system and active sludge processing system;
The said aerating system of clearing up comprises digestion device and portable incubator;
Be provided with active sludge in the said portable incubator, said active sludge contains the dominant bacteria of cultivating domestication with determined sewage; The active sludge that cultivation obtains is used for the biochemical oxygen consumption pollutant of degradation of sewage after flushing, filter are done and weighed.
The built-in data collecting card of said UV scanning spectrophotometer, and data transmission carried out data processing to Computer Control Unit;
Said UV scanning spectrophotometer, digestion device and incubator all have the independent embedded control system by Computer Control Unit control;
Said active sludge processing system is to be used for active sludge is separated the high speed rotating separation vessel that the back recycling utilizes again with sewage.
Clear up aerating system and also comprise filtrator, the solution that filtrator filters out from active sludge after the biodegradation is tested.This filtrator can adopt through behind the sintered ceramic gravity settling, draws top solution and tests.
UV scanning spectrophotometer analytic system adopts the fiber spectrometer that all band absorbance can be provided.
Said instrument comprises that also portable chamber is used to place vessel and the reagent of measuring, hold water sample.
High-energy battery group power supply is adopted in the digestion device power supply; The power supply of incubator employing high-energy battery group, the other plug-in miniature atmosphere vacuum pump of incubator, the air-flow size is through fixedly vapour lock adjusting.
The above-mentioned portable chemical oxygen utilization and the method for application of BOD analyser may further comprise the steps:
(1) after sewage is cleared up in digestion device with potassium dichromate method, obtains COD preceding value, i.e. the COD value of sewage with the scanning of UV scanning spectrophotometer;
(2) after the active sludge degraded of sewage in portable incubator, get into the sample that obtains after clearing up in the digestion device again and obtain being worth behind the COD with the scanning of UV scanning spectrophotometer;
(3) calculate mensuration BOD5 result by formula again, said computing formula is:
COD＝Kc∑A+B；
Before the COD-COD after=Δ COD=BODs;
BOD5＝BODs·Kb
Kb, Kc are that the water sample with reality is a standard model; Kc measures with national standard method and UV scanning method simultaneously, is theoretical value with the standard method measured value, returns with the peak area that scans and tries to achieve, and A is a scan area in the formula, and B is for cutting a square; Kb is simultaneously to one group of sample with a kind of sewage, measures with standard dilution method and ultraviolet photometry and tries to achieve.
Kc specifically asks method: the theoretical COD value of being obtained same water sample by the GB volumetric method; Obtain the theoretical value of five dilute concentrations again, scan, obtain corresponding peak area with these five dilute samples; Carry out linear regression with peak area and theoretical COD value, promptly draw the computing formula of COD.
Kb specifically asks method: do 5 parallel appearance by a certain sewage sample, with GB dilution method on the five, obtain BOD5, ask with said method simultaneously to obtain BODS; Kb is that 5 numerical value of 5 numerical value and the BODS of BOD5 obtain with the method for linear regression.
The aeration of portable incubator, constant temperature culture optimum temperature are 30～35 ℃, and said digestion device is cleared up processing at 160-165 ℃ to sewage.
It is 351 to carry out length scanning with the wave band of each 10-20nm of characteristic peak wavelength of 258nm that the UV scanning spectrophotometer uses ultraviolet wavelength.
The present invention has following advantage:
That the present invention adapts to is wide, measure concentration range greatly, do not poison, a machine can measure COD/BOD, and is simple to operate, be easy to grasp, meet the changeable situation of China's waste water complicated component.
Description of drawings
Fig. 1 block scheme of the present invention
Fig. 2 apparatus of the present invention structural representation
Embodiment
Embodiment 1
As depicted in figs. 1 and 2, instrument of the present invention comprises Computer Control Unit 1, UV scanning spectrophotometer 2, clears up aerating system 5, active sludge processing system 6.The said aerating system 5 of clearing up comprises digestion device 3 and portable incubator 4; Be provided with active sludge in the said portable incubator 4, said active sludge contains the dominant bacteria of cultivating domestication with determined sewage;
Said UV scanning spectrophotometer 2 built-in data collecting cards, and data transmission carried out data processing to Computer Control Unit;
Said UV scanning spectrophotometer 2, digestion device and incubator all have independent embedded control system, are controlled by Computer Control Unit;
Said active sludge processing system 6 separates the high speed rotating separation vessel that the back recycling utilizes again for being used for to active sludge with sewage.
Clear up aerating system 5 and also comprise filtrator, the solution that filtrator filters out from active sludge after the biodegradation is tested.This filtrator can adopt through behind the sintered ceramic gravity settling, draws top solution and tests.
The high-energy battery group is adopted in digestion device 3 power supplies; Incubator 4 employing high-energy battery group power supplies, incubator 4 other plug-in miniature atmosphere vacuum pump, the air-flow size is through fixedly vapour lock adjusting.
The spectrophotometric technical parameter of table 1 UV scanning
The high-energy battery group is adopted in digestion device 3 power supplies, adds thermal recovery AC/DC heating plate, and clear up sample is 4 at every turn, and requirement can be cleared up more than 10 batches; The basic fundamental parameter is as shown in table 2:
The basic fundamental parameter of table 2 digestion device
| Project | Specification |
| Temperature range | 60-190℃ |
| The constant temperature precision | ±1.0 |
| Clear up batch | Four water samples, 10 batches |
| Power supply mode | 220V, high-energy battery |
| Regularly remind | 1-666 minute |
| Rated power | 60W |
| Weight | 2kg |
Incubator 4 employing high-energy battery group power supplies, the other plug-in miniature atmosphere vacuum pump of incubator, the air-flow size is through fixedly vapour lock adjusting; The basic fundamental parameter is as shown in table 3:
The basic fundamental parameter of table 3 incubator
| Project | Specification |
| Temperature shows | Digital display |
| Temperature range | Room temperature-70 ℃ |
| Temperature-controlled precision | ±0.5℃ |
| Power supply mode | The 220V conversion; The high-energy battery group |
| Weight | 3kg |
The method of application of the portable COD/BOD analyser of the present invention may further comprise the steps:
(1) after sewage is cleared up under 160-165 ℃ in digestion device with potassium dichromate method; Obtain value before the COD with UV scanning spectrophotometer scanning, the UV scanning spectrophotometer use ultraviolet wavelength be 351 and the wave band of each 10-20nm of characteristic peak wavelength of 258nm carry out length scanning;
(2) sewage is after the degraded of the active sludge in portable incubator under 30～35 ℃; After getting into the sample that obtains after clearing up under 160-165 ℃ in the digestion device again and obtaining COD with the scanning of UV scanning spectrophotometer, it is 351 to carry out length scanning with the wave band of each 10-20nm of characteristic peak wavelength of 258nm that the UV scanning spectrophotometer uses ultraviolet wavelength;
(3) calculate mensuration BOD5 result by formula again, said computing formula is:
COD＝Kc∑A+B；
Before the COD-COD after=Δ COD=BODs;
BOD5＝BODs·Kb
Kb specifically asks method: do the parallel appearance of 5 different proportions by same sewage sample, with GB dilution method on the five, obtain BOD5, try to achieve parallel kind BODs of these 5 different proportions simultaneously with said method; Kb is that 5 numerical value of 5 numerical value and the BODS of BOD5 obtain with the method for linear regression.
Kc specifically asks method: the theoretical COD value of being obtained same water sample by the GB volumetric method; Obtain the theoretical value of five dilute concentrations again, scan, obtain corresponding peak area with these five dilute samples; Carry out linear regression with peak area and theoretical COD value, promptly draw the computing formula of COD.
As shown in Figure 1, gather water sample 50ml, regulate between the PH6.5-7.2; Simultaneously bacterial classification flushing, the filter through acclimation shaking culture in the culturing sludge jar done; The 2-3g (the dewatered sludge water percentage is about 97%) that weighs adds in the incubator with water sample together, aeration, stirs biodegradation; The control dissolved oxygen DO is at 2-3mg/L, and temperature is controlled at 30 ℃.
After biodegradation in 2 hours, carry out mud-water separation.Get supernatant 2ml as biodegradation after sample, add 1ml K
2Cr
2O
7, 5ml H
2SO
4-Ag
2SO
4, 1ml Hg
2SO
4Heating 165 ℃ cleared up 15 minutes.Gather simultaneously and do not have through the former water sample 2ml of biodegradation, 1ml K
2Cr
2O
7, 5ml H
2SO
4-Ag
2SO
4, 1ml Hg
2SO
4Heating was cleared up 15 minutes.After two samples take out cool to room temperature, respectively be diluted to 100ml, sampling COD uses the ultraviolet photometry) detect.Correlativity according to absorbance and COD draws the COD value, and with formula (before the COD-COD after) BOD coefficient=BOD5, draws the BOD5 value.
Embodiment 3
The instrument of utilization embodiment 1 combines the method for application of embodiment 2 these instruments, and the present invention tests different wastewater samples, confirms COD, BOD5 (being BOD) and Kb value, and is as shown in table 4 below:
Table 4 the present invention confirms COD, BOD5 and Kb value to different wastewater sample tests
| Sequence number | COD (before the COD) | Behind the COD | BODs | Kb | BOD5 |
| Printing and dyeing mill | 256.5 | 35.5 | 221.0 | 0.56 | 123.8 |
| The jute mill | 592.0 | 124 | 468.0 | 0.45 | 260.1 |
| Sewage Plant | 114.3 | 21.5 | 92.8 | 0.65 | 60.3 |
| Tannery | 645.5 | 84.0 | 561.5 | 0.82 | 460.8 |
| The paper mill | 13540 | 6254 | 7286 | 0.38 | 2768 |
Embodiment 4
The instrument of utilization embodiment 1 combines the method for application of embodiment 2 these instruments, and the present invention tests different wastewater samples, and contrast is the test result of BOD reason and BOD5 of the present invention with the BOD of GB dilution method on the five, and the mg/l of unit is as shown in table 5 below:
Table 5 GB dilution method BOD5 on the five and the present invention survey the test result correlation data of BOD5
| Sequence number | BOD5 (actual measurement) | BOD5 (state's standard specimen) | Absolute error | Relative error % |
| 1 | 151 | 150±5 | 1 | 0.7 |
| 2 | 158 | 150±5 | 8 | 5.5 |
| 3 | 157 | 150±5 | 7 | 4.7 |
| 4 | 150 | 150±5 | 0 | 0 |
| 5 | 151 | 150±5 | 1 | 0.3 |
| 6 | 150 | 150±5 | 0 | 0 |
Claims (7)
1. portable chemical oxygen utilization and BOD analyser comprise computer-controlled UV scanning spectrophotometer, and it is characterized in that: said analyser also comprises clears up aerating system and active sludge processing system;
The said aerating system of clearing up comprises digestion device, portable incubator and filtrator, and the solution that said filtrator filters out from active sludge after the biodegradation is tested;
Be provided with active sludge in the said portable incubator, said active sludge contains the dominant bacteria of cultivating domestication with determined sewage;
Said digestion device and incubator all have by computer-controlled independent embedded control system;
Said active sludge processing system is for being used for active sludge with after sewage separates the high speed rotating separation vessel that the active sludge recycling utilizes again.
2. portable chemical oxygen utilization as claimed in claim 1 and BOD analyser is characterized in that: the UV scanning spectrophotometer adopts the fiber spectrometer that all band absorbance can be provided.
3. portable chemical oxygen utilization as claimed in claim 1 and BOD analyser is characterized in that: said analyser comprises that also portable chamber is used to place vessel and the reagent of measuring, hold water sample.
4. portable chemical oxygen utilization as claimed in claim 1 and BOD analyser is characterized in that: the high-energy battery group is adopted in the digestion device power supply; Incubator is supplied power and is adopted the high-energy battery group, the other plug-in miniature atmosphere vacuum pump of incubator, and the air-flow size is through fixedly vapour lock adjusting.
5. the method for application of portable chemical oxygen utilization as claimed in claim 1 and BOD analyser may further comprise the steps:
(1) after sewage is cleared up in digestion device with potassium dichromate method, obtains COD preceding value, i.e. the COD value of sewage with the scanning of UV scanning spectrophotometer;
(2) after the active sludge degraded of sewage in portable incubator, get into the sample that obtains after clearing up in the digestion device again and obtain being worth behind the COD with the scanning of UV scanning spectrophotometer;
(3) calculate mensuration BOD5 result by formula again, said computing formula is:
COD＝Kc∑A+B；
Before the COD-COD after=Δ COD=BODs;
BOD5＝BODs·Kb
Kb, Kc are that the water sample with reality is a standard model; Kc measures with national standard method and UV scanning method simultaneously, is theoretical value with the standard method measured value, returns with the peak area that scans and tries to achieve, and A is a scan area in the formula, and B is for cutting a square; Kb is simultaneously to one group of sample with a kind of sewage, measures with standard dilution method and ultraviolet photometry and tries to achieve.
6. the method for application of portable chemical oxygen utilization as claimed in claim 5 and BOD analyser; It is characterized in that: the aeration of its portable incubator, constant temperature culture optimum temperature are 30～35 ℃, and said digestion device is cleared up processing at 160-165 ℃ to sewage.
7. the method for application of portable chemical oxygen utilization as claimed in claim 5 and BOD analyser is characterized in that: it is 351 to carry out length scanning with the wave band of each 10-20nm of characteristic peak wavelength of 258nm that the UV scanning spectrophotometer uses ultraviolet wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102122804A CN101865837B (en) | 2010-06-29 | 2010-06-29 | Portable chemical COD/BOD (Chemical Oxygen Demand/Biological Oxygen Demand) analyzer and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102122804A CN101865837B (en) | 2010-06-29 | 2010-06-29 | Portable chemical COD/BOD (Chemical Oxygen Demand/Biological Oxygen Demand) analyzer and application method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101865837A CN101865837A (en) | 2010-10-20 |
| CN101865837B true CN101865837B (en) | 2012-05-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106596410A (en) * | 2016-11-22 | 2017-04-26 | 西安工程大学 | Method for quickly detecting property of active sludge through light deflection |
| CN106650296B (en) * | 2017-01-09 | 2019-01-15 | 浙江大学城市学院 | A kind of high-concentration sewage COD digestion system and method based on two sections of processing |
| CN107389569A (en) * | 2017-06-05 | 2017-11-24 | 深圳市衡兴安全检测技术有限公司 | BOD detection method in a kind of water |
| CN111855947A (en) * | 2020-08-10 | 2020-10-30 | 北京石油化工学院 | Toxicity detection method based on BOD difference value before and after degradation of activated sludge |
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