CN102288653A - Online biochemical oxygen demand (BOD) detector and detection method of same - Google Patents
Online biochemical oxygen demand (BOD) detector and detection method of same Download PDFInfo
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- CN102288653A CN102288653A CN2011101165883A CN201110116588A CN102288653A CN 102288653 A CN102288653 A CN 102288653A CN 2011101165883 A CN2011101165883 A CN 2011101165883A CN 201110116588 A CN201110116588 A CN 201110116588A CN 102288653 A CN102288653 A CN 102288653A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 92
- 239000001301 oxygen Substances 0.000 title claims abstract description 92
- 238000001514 detection method Methods 0.000 title abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000012895 dilution Substances 0.000 claims abstract description 33
- 238000010790 dilution Methods 0.000 claims abstract description 33
- 239000010865 sewage Substances 0.000 claims abstract description 32
- 238000005273 aeration Methods 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 239000000919 ceramic Substances 0.000 claims abstract description 8
- 239000007853 buffer solution Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 23
- 238000012360 testing method Methods 0.000 claims description 16
- 239000000758 substrate Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 230000005477 standard model Effects 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 238000003760 magnetic stirring Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 15
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 description 8
- 244000005700 microbiome Species 0.000 description 6
- 239000012528 membrane Substances 0.000 description 4
- 238000011109 contamination Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012120 mounting media Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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Abstract
The invention relates to an online biochemical oxygen demand (BOD) detector and a detection method of the same. A sewage pump, a dilution water pump, an air pump and a buffer solution pump are connected with an aeration tank, the aeration tank is communicated with a reactor, the reactor is connected with a controller, a connecting pipe and a connecting wire are provided with a dissolved oxygen electrode, and the controller is connected with the sewage pump and the dilution water pump. Sewage to be detected flows through the sewage pump, dilution water flows through the dilution water pump, air is pumped by the air pump into to the aeration tank for aeration to achieve dissolved oxygen saturation, and when dissolved oxygen flows through porous ceramic of the reactor, changes in the concentration of the dissolved oxygen in front of and behind the porous ceramic is measured. The concentration of the dissolved oxygen in sewage after reaction is continuously monitored by a dissolved oxygen sensor. The sample input rate is controlled by the controller to maintain constant changes in the concentration of the dissolved oxygen, and the BOD value is calculated based on comparison of the flow rate of the sample to be tested under conditions with the same fixed value of the dissolved oxygen concentration after reaction and the standard sample input rate. Completely automated measurement and continuous real-time monitoring can be achieved, and the dynamic BOD value of a water body can be displayed at any time.
Description
Technical field
The present invention relates to the uninterrupted continuously analyzer of measuring of a kind of water body BOD and the method for detection.
Background technology
Biochemical oxygen demand (BOD) is meant under defined terms, the dissolved oxygen DO i that the Biochemical processes of material, particularly decomposing organic matter that some in the microorganism decomposition water can be oxidized consume.BOD detects one of most important index of water pollution degree.When sanitary sewage or industrial sewage are disposed to the river, behind river or the lake, just the aerobic microbiological in the water body decomposes the composition in the sewage, thereby dissolved oxygen DO is just consumed in a large number in the water body, and the biology such as the fish that make some need a large amount of oxygen could survive are difficult to survive.On the other hand, in order to reduce the pollution of environment, before sewage discharge is to the natural water, can handle earlier, to remove the most of organism that contains.Adopting the most at present, disposal route is a microbial degradation method, in the process that the method is disposed of sewage, the BOD of sewage before handling, BOD in the sudden and violent oxygen pond is a very important parameters of monitoring operation processing procedure, and the BOD reason relevant laws and regulations of handling back sewage retrain, the monitoring that must continue.Therefore all there is the BOD standard of oneself in most at present countries to protect the environment of this country.
China environmental protection portion has issued i.e. " the mensuration dilution and the inocalation method of water quality five-day BOD (the BOD5) " i of the up-to-date state environment protecting standard HJ505-2009 of the People's Republic of China (PRC) on October 20th, 2009.According to this standard, the test process of BOD needs 5 day time, and the so long time interval can't guarantee the statutable reliability service of wastewater treatment energy, has greatly limited its application; And test process is very complicated, not only wastes time and energy, and for operating personnel high requirement is arranged also.
Up to the present, solving existing many effort on the long problem of conventional BOD test duration, wherein the most influential is the biological membrane BOD fast detection method ii of Japanese Shuichi Suzuki invention.This method can be in 30 minutes fast detecting BOD and operation very simple.According to this method, microorganism is fixed on the film on dissolved oxygen electrode surface.In not containing organic sample, it is stable that the reading of dissolved oxygen electrode keeps, and when including organism in the sample, the microorganism of being fixed in the film can consume dissolved oxygen DO with decomposing organic matter, so dissolved oxygen concentration can reduce with the increase that comprises organic concentration.Organic concentration is the minimizing value that is proportional to dissolved oxygen DO.Rapidly, also there is sizable problem in it though this method is very simple: the first, owing to the activation of microorganism meeting time to time change that is fixed on the dissolved oxygen electrode film, therefore need frequent calibration equipment.The second, owing to the microorganism kind that is fixed on the film is limited, be easy in actual applications run into exceed the organic components that fixation of microbe can decompose, thereby cause test result problem on the low side.The 3rd, when the organic concentration in the sample surpassed certain limit, the oxygen expenditure speed of fixation of microbe just no longer increased on the film, reaches capacity, and makes its measurement range limited.The 4th, the character of biological membrane itself also has considerable influence for test result, the thickness of film for example, inner aperture etc.The 5th, because biological membrane needs frequent the replacing, therefore can't realize the continuous on-line monitoring of BOD.
The limitation of existing method has caused present BOD fast detecting equipment that water body parameter fast and accurately can't really be provided, so limited the application of BOD in environmental monitoring greatly.Particularly in current environment monitoring digitizing, under the trend of networked and round-the-clock uninterrupted detection, the equipment of researching and developing a kind of on-line monitoring continuously will improve the efficient that China's water body environment is monitored the field greatly.
Summary of the invention
The objective of the invention is at above-mentioned present situation, aiming to provide a kind ofly can provide water body parameter fast and accurately, continuously the biochemical oxygen demand on-line determination instrument BOD of on-line monitoring biochemical oxygen demand and with the method for its detection.
The implementation of the object of the invention is, biochemical oxygen demand BOD on-line determination instrument, sewage pump connects conduit one, the dilution water pump connects conduit two, pneumatic pump connects conduit three, buffer solution pump connects conduit four, conduit one, two, three, four connect the aeration tank, holding water pump on the sample introduction pipe that the aeration tank is communicated with reactor, reactor is connected with controller by lead, adorn dissolved oxygen electrode on the lead, the sample introduction pipe of reactor, go out dress dissolved oxygen electrode one on the sample pipe, dissolved oxygen electrode two, controller connects sewage pump, the dilution water pump, be placed with the porous ceramics of fixation of microbe in the reactor, there is magnetic stirring apparatus the below, and reactor is by water-bath, and oil bath or exothermic material directly wrap up.
The pin of the single-chip microcomputer of controller connects dissolved oxygen sensor one, 26 pin receive dissolved oxygen sensor two, 30 pin connect sewage pump through photoisolator one, 29 pin connect the dilution water pump through photoisolator two, 32 pin connect 10 pin of level transferring chip, 33 pin connect 9 pin of level transferring chip, and 7 pin of level transferring chip, 8 pin and ground are connected to computing machine by RS232.
Detect the method for biochemical oxygen demand with biochemical oxygen demand on-line determination instrument, sewage to be measured is through sewage pump, conduit one, dilution water arrives the aeration tank through dilution water pump, conduit two pumps, damping fluid pumps into the aeration tank through buffer solution pump, conduit four, pH value of solution value to be measured is at 6-8, air pumps into the aeration tank via pneumatic pump, conduit three, makes to be rich in oxygen in the aeration tank
Water pump pumps into reactor with the liquid that mixes in the aeration tank with constant flow, on the sample introduction pipe 18 the dissolved oxygen electrode of adorning measure the oxygen content of input liquid, the result is input to controller, and contained flora absorption is fixed on the interior porous ceramics of reactor in the active sludge
The single-chip microcomputer of controller receives the input signal of dissolved oxygen sensor one, two, through calculating the output control signal, through the rotating speed of photoisolator control sewage pump, dilution water pump;
Two dissolved oxygen electrodes that single-chip microcomputer receives record the signal of oxygen concentration after the level transferring chip conversion, the input computing machine, keeping under the condition that the sample oxygen level is certain behind the final reaction, the BOD value that the ratio of standard model input rate and testing sample input rate multiply by standard model is the BOD value of testing sample.
The present invention with compared following advantage based on biomembranous BOD rapid assay methods:
1) avoided the restriction of the density classes of biomembranous microorganism.
2) biological membrane of consume expensive not need not to replace consumptive material.
3) whole measurement flow process full automation does not need human intervention.
4) the equipment range only depends on the flow rates of sewage pump, dilution water pump, need not consider the dilution problem;
5) can continuous monitoring, show the dynamic BOD value of water body at any time, accomplish real-time monitoring.
6) can form the environmental monitoring Internet of Things by network, improve environmental monitoring efficient greatly.
Description of drawings
Fig. 1 is a biochemical oxygen demand on-line determination instrument structural representation of the present invention,
Fig. 2 is test philosophy figure of the present invention,
Fig. 3 is the present invention's electricity theory diagram.
Embodiment
With reference to Fig. 1, the sewage pump 5 of biochemical oxygen demand on-line determination instrument connects conduit 1, dilution water pump 6 connects conduit 22, pneumatic pump 4 connects conduit 33, buffer solution pump 8 connects conduit 47, conduit one, two, three, four connects aeration tank 9, holding water pump 10 on aeration tank 9 and the sample introduction pipe that reactor 13 is communicated with, reactor 13 is connected with controller 17 by lead, dress dissolved oxygen electrode 11 on the lead, the sample introduction pipe 18 of reactor 13, go out on the sample pipe 15 dress dissolved oxygen electrode 1, dissolved oxygen electrode 2 16, controller connects sewage pump 5, dilution water pump 6.Be placed with the porous ceramics 14 of fixation of microbe in the reactor, there is magnetic stirring apparatus 12 below.Reactor 9 is by water-bath, and oil bath or exothermic material directly wrap up.
Dissolved oxygen sensor of the present invention can adopt galvanochemistry dissolved oxygen electrode or fluorescence dissolved oxygen electrode.
During mensuration, sewage to be measured is through sewage pump 5, conduit 1, and dilution water arrives aeration tank 9 through dilution water pump 6, conduit 22 pumps.Damping fluid pumps into aeration tank 9 through buffer solution pump 8, conduit 47, so that pH value of solution value to be measured remains on about 7.Air pumps into aeration tank 9 via pneumatic pump 4, conduit 33, makes to be rich in oxygen in the aeration tank.Water pump 10 pumps into reactor 13 with the liquid that mixes in the aeration tank with constant flow.Before entering reactor 13 by sample introduction pipe 18, dissolved oxygen electrode 1 is measured the oxygen content of input liquid, and the result is input to controller 17 by lead.Contained flora is fixed on the porous ceramics 14 by absorption in the active sludge, and the liquid in the reactor drives stirrer by magnetic stirring apparatus 12 and stirs, to guarantee that diffusion evenly.
Reacted liquid flows out from going out sample pipe 15, during outflow, measures the oxygen content of output liquids by dissolved oxygen electrode 2 16, and with the result by lead input controller 19.Controller will be controlled the speed that pumps into of sewage pump 5, dilution water pump 6 with suitable dilution proportion sample according to dissolved oxygen electrode one, two measurement results.Keeping under the condition that the sample oxygen level is certain behind the final reaction, the BOD value that the ratio of standard model input rate and testing sample input rate multiply by standard model is the BOD value of testing sample.
Test philosophy is based on Michaelis-Menten equation (Michaelis-Menten equation):
V＝V
max*(C/K
m+C)
In the formula, V is a reaction velocity, V
MaxBe maximum reaction velocity, C is a concentration of substrate, K
mIt is Michaelis constant.
When C much smaller than K
mThe time, this equation can be similar to and be reduced to
V＝V
max*(C/K
m)
This approximate equation is illustrated in concentration of substrate when low, and reaction velocity is approximate to be proportional to concentration of substrate, that is to say that at input organic contamination substrate concentration its concentration is proportional to oxygen expenditure speed when lower scope is interval.Michaelis-Menten equation is not set up when the constant and concentration of substrate of enzyme amount is not subjected to diffusion control, these conditions in reactor available porosint as mounting medium with utilize magnetic agitation to strengthen the substrate rate of propagation and satisfy.
With reference to Fig. 2, transverse axis is represented the organic contamination substrate concentration, concentration of substrate just, and the longitudinal axis is represented reaction velocity, and the transverse axis top curve is represented Michaelis-Menten equation.C
0Representative is much smaller than the immobilized substrate concentration of Km, according to the Michaelis-Menten equation after simplifying, in this concentration is between linear zone.The oblique line of transverse axis below is represented the extension rate of organic contamination substrate concentration.When concentration of substrate C to be measured is positioned at nonlinear area, concentration C shown in the figure for example
1, then with its dilution n
1Doubly, make concentration of substrate C to be measured
1Fixed concentration C in can reaching between linear zone
0Therefore for surpassing C arbitrarily
0Concentration of substrate, all can make it equal C by dilution
0
Computation process is as follows:
Test process carries out under the 760Torr at 20 ℃, and this moment, dissolved oxygen concentration was about 9mg/L, if on-stream pressure changes, can according to Henry's law (Henry ' s Law, C=K*P) calculate dissolved oxygen concentration.The accurate solution substrate B of bidding OD value is BOD
0, at dilution n
0Enter reactor reaction doubly, making two dissolved oxygen electrodes record difference in oxygen concentration between is Δ O
2, BOD
0/ n
0=Δ O
2, utilize controller control dilution ratio n, make Δ O
2Keep constant, when the BOD of unknown sample value is BOD
x, BOD is then arranged
x/ n
x=Δ O
2, then the BOD value of unknown sample can be calculated as BOD
x=BOD
0* n
x/ n
0
With reference to Fig. 3,22 pin of the single-chip microcomputer 19 of controller 17 connect the input signal of dissolved oxygen sensor 1,26 pin receive dissolved oxygen sensor 2 16,30 pin connect sewage pump 5 through photoisolator 1,29 pin connect 10 pin that dilution water pump 6,32 pin connect level transferring chip 20 through photoisolator 2 22, and 33 pin connect 9 pin of level transferring chip 20,7 pin of level transferring chip, 8 pin and ground are connected to computing machine by RS232.
Single-chip microcomputer is selected the ADUC7020 of U.S. analog company for use, and photoisolator one and photoisolator two are all selected the 6N137 of avago company for use, and level conversion 20 is selected the MAX232 of maxim company for use.
22 pin of the single-chip microcomputer 19 (MCU) of controller 17 receive the input signal of dissolved oxygen sensor 1,26 pin of single-chip microcomputer 19 receive the input signal of dissolved oxygen sensor 2 16, through calculating, by the 30 pin output control signal of single-chip microcomputer 19, through the rotating speed of photoisolator 21 back control sewage pumps 5; The 29 pin output control signal of single-chip microcomputer 19 is through the rotating speed of photoisolator 22 back control dilution water pumps 6.
Two dissolved oxygen electrodes that single-chip microcomputer 19 receives record the signal of oxygen concentration through level transferring chip 20 ... after the conversion, import computing machine, and calculate the BOD value of testing sample.
Computing machine is sent to environmental monitoring station with measurement result and calculated value immediately by network, and forms the environmental monitoring Internet of Things by network, has improved environmental monitoring efficient greatly.
Reference paper
The i Environmental Protection Department, " the mensuration dilution and the inocalation method of water quality five-day BOD (BOD5) ", the state environment protecting standard HJ505-2009 of the People's Republic of China (PRC).
iii?US?Pat?No.4,350,763。
Claims (5)
1. biochemical oxygen demand BOD on-line determination instrument, it is characterized in that sewage pump connects conduit one, the dilution water pump connects conduit two, pneumatic pump connects conduit three, buffer solution pump connects conduit four, conduit one, two, three, four connect the aeration tank, holding water pump on the sample introduction pipe that the aeration tank is communicated with reactor, reactor is connected with controller by lead, adorns dissolved oxygen electrode on the lead, the sample introduction pipe of reactor, go out dress dissolved oxygen electrode one on the sample pipe, dissolved oxygen electrode two, controller connects sewage pump, dilute water pump, be placed with the porous ceramics of fixation of microbe in the reactor, there is magnetic stirring apparatus the below, reactor is by water-bath, and oil bath or exothermic material directly wrap up.
The pin of the single-chip microcomputer of controller connects dissolved oxygen sensor one, 26 pin receive dissolved oxygen sensor two, 30 pin connect sewage pump through photoisolator one, 29 pin connect the dilution water pump through photoisolator two, 32 pin connect 10 pin of level transferring chip, 33 pin connect 9 pin of level transferring chip, and 7 pin of level transferring chip, 8 pin and ground are connected to computing machine by RS232.
2. biochemical oxygen demand BOD on-line determination instrument according to claim 1 is characterized in that the reactor of reactor (13) for material preparations such as glass, organic glass, stainless steel, potteries.
3. biochemical oxygen demand BOD on-line determination instrument according to claim 1 is characterized in that dissolved oxygen sensor adopts galvanochemistry dissolved oxygen electrode or fluorescence dissolved oxygen electrode.
4. detect the method for biochemical oxygen demand with the described biochemical oxygen demand BOD on-line determination of claim 1 instrument, it is characterized in that sewage to be measured is through sewage pump, conduit one, dilution water arrives the aeration tank through dilution water pump, conduit two pumps, damping fluid pumps into the aeration tank through buffer solution pump, conduit four, pH value of solution value to be measured is at 6-8, air pumps into the aeration tank via pneumatic pump, conduit three, makes to be rich in oxygen in the aeration tank
Water pump pumps into reactor with the liquid that mixes in the aeration tank with constant flow, on the sample introduction pipe 18 the dissolved oxygen electrode of adorning measure the oxygen content of input liquid, the result is input to controller, and contained flora absorption is fixed on the interior porous ceramics of reactor in the active sludge
The single-chip microcomputer of controller receives the input signal of dissolved oxygen sensor one, two, through calculating the output control signal, through the rotating speed of photoisolator control sewage pump, dilution water pump;
Two dissolved oxygen electrodes that single-chip microcomputer receives record the signal of oxygen concentration through level transferring chip ... after the conversion, the input computing machine, keeping under the condition that the sample oxygen level is certain behind the final reaction, the BOD value that the ratio of standard model input rate and testing sample input rate multiply by standard model is the BOD value of testing sample.
5. biochemical oxygen demand BOD on-line determination instrument according to claim 4 is measured the method for biochemical oxygen demand, it is characterized in that computation process is as follows:
Test process carries out under the 760Torr at 20 ℃, and this moment, dissolved oxygen concentration was about 9mg/L, and on-stream pressure changes, and calculates dissolved oxygen concentration according to Henry's law, and the accurate solution substrate B of bidding OD value is BOD
0, at dilution n
0Enter reactor reaction doubly, making two dissolved oxygen electrodes record difference in oxygen concentration between is Δ O
2, BOD
0/ n
0=Δ O
2, utilize controller control dilution ratio n, make Δ O
2Keep constant, when the BOD of unknown sample value is BOD
x, BOD is then arranged
x/ n
x=Δ O
2, then the BOD value of unknown sample is BOD as calculated
x=BOD
0* n
x/ n
0
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Cited By (8)
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| CN102798650A (en) * | 2012-08-29 | 2012-11-28 | 中国科学院长春应用化学研究所 | Method and device for detecting biochemical oxygen demand |
| CN104330530A (en) * | 2014-10-29 | 2015-02-04 | 核工业北京化工冶金研究院 | Dissolved oxygen (DO) testing device and DO testing method |
| CN104812887A (en) * | 2012-10-26 | 2015-07-29 | 麻省理工学院 | Humidity control in chemical reactors |
| CN105842315A (en) * | 2016-03-17 | 2016-08-10 | 中国科学院电子学研究所 | Electrode sensitive layer used for detecting biochemical oxygen demand |
| CN106226131A (en) * | 2016-09-19 | 2016-12-14 | 中国石油大学(华东) | The sampling system of a kind of volatile organic matter in sewage and the method for sampling thereof |
| CN109709197A (en) * | 2019-01-24 | 2019-05-03 | 天津市赛普新锐仪器科技有限公司 | BOD Quick testing instrument and accurately compensate measuring method |
| US10479973B2 (en) | 2013-08-23 | 2019-11-19 | Massachuesetts Institute Of Technology | Small volume bioreactors with substantially constant working volumes and associated systems and methods |
| CN117740748A (en) * | 2023-12-20 | 2024-03-22 | 湖南省计量检测研究院 | BOD online rapid detection method and device |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798650A (en) * | 2012-08-29 | 2012-11-28 | 中国科学院长春应用化学研究所 | Method and device for detecting biochemical oxygen demand |
| CN104812887A (en) * | 2012-10-26 | 2015-07-29 | 麻省理工学院 | Humidity control in chemical reactors |
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| US11459538B2 (en) | 2012-10-26 | 2022-10-04 | Sanofi | Humidity control in chemical reactors |
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| US10479973B2 (en) | 2013-08-23 | 2019-11-19 | Massachuesetts Institute Of Technology | Small volume bioreactors with substantially constant working volumes and associated systems and methods |
| US11827871B2 (en) | 2013-08-23 | 2023-11-28 | Massachusetts Institute Of Technology | Small volume bioreactors with substantially constant working volumes and associated systems and methods |
| CN104330530A (en) * | 2014-10-29 | 2015-02-04 | 核工业北京化工冶金研究院 | Dissolved oxygen (DO) testing device and DO testing method |
| CN104330530B (en) * | 2014-10-29 | 2016-05-18 | 核工业北京化工冶金研究院 | A kind of DO determination device and assay method |
| CN105842315A (en) * | 2016-03-17 | 2016-08-10 | 中国科学院电子学研究所 | Electrode sensitive layer used for detecting biochemical oxygen demand |
| CN105842315B (en) * | 2016-03-17 | 2018-09-11 | 中国科学院电子学研究所 | A kind of electrode sensitive layer for biochemical oxygen demand (BOD) detection |
| CN106226131B (en) * | 2016-09-19 | 2023-08-18 | 中国石油大学(华东) | Sampling system and sampling method for volatile organic compounds in sewage |
| CN106226131A (en) * | 2016-09-19 | 2016-12-14 | 中国石油大学(华东) | The sampling system of a kind of volatile organic matter in sewage and the method for sampling thereof |
| CN109709197A (en) * | 2019-01-24 | 2019-05-03 | 天津市赛普新锐仪器科技有限公司 | BOD Quick testing instrument and accurately compensate measuring method |
| CN109709197B (en) * | 2019-01-24 | 2024-01-12 | 天津市赛普新锐仪器科技有限公司 | BOD rapid tester and accurate compensation testing method |
| CN117740748A (en) * | 2023-12-20 | 2024-03-22 | 湖南省计量检测研究院 | BOD online rapid detection method and device |
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