CN109709197A - BOD Quick testing instrument and accurately compensate measuring method - Google Patents
BOD Quick testing instrument and accurately compensate measuring method Download PDFInfo
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- CN109709197A CN109709197A CN201910069593.XA CN201910069593A CN109709197A CN 109709197 A CN109709197 A CN 109709197A CN 201910069593 A CN201910069593 A CN 201910069593A CN 109709197 A CN109709197 A CN 109709197A
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- 238000012360 testing method Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 77
- 239000001301 oxygen Substances 0.000 claims abstract description 77
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 77
- 238000005259 measurement Methods 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 230000002906 microbiologic effect Effects 0.000 claims abstract description 35
- 238000004140 cleaning Methods 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 19
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 13
- 244000005700 microbiome Species 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 15
- 230000000813 microbial effect Effects 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 238000002795 fluorescence method Methods 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- GTKRFUAGOKINCA-UHFFFAOYSA-M chlorosilver;silver Chemical compound [Ag].[Ag]Cl GTKRFUAGOKINCA-UHFFFAOYSA-M 0.000 claims 1
- 238000004090 dissolution Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000000523 sample Substances 0.000 description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000008676 import Effects 0.000 description 5
- 239000002352 surface water Substances 0.000 description 4
- 238000002306 biochemical method Methods 0.000 description 3
- ZYDVNTYVDVZMKF-UHFFFAOYSA-N [Cl].[Ag] Chemical compound [Cl].[Ag] ZYDVNTYVDVZMKF-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013068 control sample Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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- Apparatus Associated With Microorganisms And Enzymes (AREA)
Abstract
The invention belongs to environmental monitoring field, and in particular to a kind of BOD Quick testing instrument and accurately compensate measuring method, BOD Quick testing instrument includes dissolved oxygen sensing module, BOD microorganism measurement module and processing module；Dissolved oxygen sensing module includes sample injection unit and cleaning unit；Sample injection unit includes sequential communication for accommodating sample injector, sample feeding pipe for sampling, a branch of threeway, peristaltic pump and the flow type dissolved oxygen sensing instrument of sample；BOD microorganism measurement module includes and the thermostat of flow type dissolved oxygen sensing instrument sequential communication, a branch of gas-liquid mixed threeway, flow type BOD microbiological sensor, sewer pipe and waste liquid barrel；Another branch of gas-liquid mixed threeway is connected to by tracheae with air pump.Present invention introduces the dissolved oxygen compensating modules of flow type dissolved oxygen sensing instrument, and give equation of higher degree compensated curve, improve the precision and accuracy of BOD measurement.
Description
Technical field
The invention belongs to environmental monitoring field, and in particular to a kind of BOD Quick testing instrument and accurately compensate measuring method.
Background technique
Biochemical oxygen demand (BOD) (Biochemical Oxygen Demand abbreviation BOD) is the Xiang Chong in aquatic environment monitoring
Want index.Traditional measuring method is biochemical method on the five, needs to cultivate five days under 20 DEG C of isoperibols, and measurement period is long, operation
Complexity is increasingly difficult to meet the needs of environmental monitoring department.Other such as mercury-free manometric methods, biochemical reactor method are surveyed
Accuracy of measurement is relatively poor, and country does not also put into effect relevant criterion.Measuring method of the invention uses microbiological sensor method, referring to ring
Guarantor portion HJ/T86-2002 relevant criterion, [the measurement microbiological sensor rapid test method of water quality biochemical oxygen demand (BOD) (BOD)].Mesh
Before, the quick instrument of microbiological sensor method BOD be used widely at home by environmental monitoring field.It is total by prolonged application experience
It binds up one's hair existing, when low concentration surface water BOD measures (especially in low temperature season), due to oxygen in water supersaturation, if do not adopted
Warming up treatment is taken, supersaturated dissolved oxygen is difficult to drive away, and can carry out error to the measuring band of BOD.
Summary of the invention
The purpose of the present invention is to overcome the defects in the prior art, provides a kind of BOD Quick testing instrument and accurate benefit
Measuring method is repaid, the Fast And Accurate Determination of low concentration BOD surface water is particularly suitable for.
The present invention to achieve the above object, using following technical scheme:
A kind of BOD Quick testing instrument, including dissolved oxygen sensing module, BOD microorganism measurement module and processing module；Institute
The dissolved oxygen sensing module stated includes sample injection unit and cleaning unit；The sample injection unit includes sequential communication for holding
Receive sample injector, sample feeding pipe for sampling, a branch of threeway, peristaltic pump and the flow type dissolved oxygen sensing instrument of sample；
The cleaning unit includes cleaning solution bucket, cleaning liquid pipe and another branch of threeway of sequential communication；The threeway
Another branch be connected to the peristaltic pump；The BOD microorganism measurement module includes dissolving with the flow type
The thermostat of oxygen measuring device sequential communication, a branch of gas-liquid mixed threeway, flow type BOD microbiological sensor, waste liquid
Pipe and waste liquid barrel；Another branch of the gas-liquid mixed threeway is connected to by tracheae with air pump.
Solenoid valve is provided on the sample feeding pipe and cleaning liquid pipe.
The processing module includes main control computer and the online display interface of main control computer and signal measurement and processing
Unit；The signal measurement and processing unit and the flow type dissolved oxygen sensing instrument and flow type BOD microorganism pass
Sensor connection；The main control computer is connect with controller；The controller stated is used to control the on-off of the solenoid valve, wriggles
The sampling of the switch and sample injector of pump.
The dissolved oxygen sensor of the flow type dissolved oxygen sensing instrument can be polarogram formula overlay film oxygen electrode or fluorescence method
Oxygen electrode.
Flow type BOD microbiological sensor is made of polarogram formula three-electrode structure oxygen electrode with sandwich-type microbial film；
The electrode group of the polarogram formula three-electrode structure oxygen electrode becomes: working electrode: gold；To electrode: platinum；Reference electrode: silver-chlorine
Change silver.
The application further includes the accurate compensation measuring method of BOD Quick testing instrument described in one kind, is dissolved using flow type
The measuring signal of oxygen measuring device and Formula B OD microbiological sensor utilizes the BOD value of formula judgement sample；The formula
Are as follows:
BOD=F (IA)+F(△I)
F(IA)=a5×IA 5+a4×IA 4+a3×IA 3+a2×IA 2
F (△ I)=k × △ I+b
IA=△ D- △ I；
Wherein:
IA is the difference that flow type dissolved oxygen instrument electrode measurement potential drop and flow type BOD microbiological sensor measure potential drop
Value.
A5 is potential value at the end of the measurement of flow type BOD microbiological sensor；
A4 is potential value at the end of flow type dissolved oxygen sensing instrument electrode measurement；
A3 is potential value when flow type BOD microbiological sensor initial measures；
A2 is potential value when flow type dissolved oxygen sensing instrument electrode initial measures；
△ D is flow type dissolved oxygen sensing instrument electrode measurement whole story current potential depreciation；
△ I is that flow type BOD microbiological sensor measures whole story potential difference；
K, b is coefficient of standard curve；
The value range of k value is 11.77-13.35；
The value range of b value is 2.26-2.78.
Compared with prior art, the beneficial effects of the present invention are:
Previous BOD Quick testing instrument works as sample simply by the BOD value in microbiological sensor sample solution
When the dissolved oxygen of itself changes in solution, error will be brought to BOD measurement, and present invention introduces flow type dissolved oxygen sensings
The dissolved oxygen compensating module of instrument, can effectively eliminate above-mentioned error, and give equation of higher degree compensated curve, improve BOD measurement
Precision and accuracy, the measurement especially for low concentration surface water BOD is possessed of higher values.
Detailed description of the invention
Fig. 1 is the overall structure diagram of BOD Quick testing instrument of the present invention；
Fig. 2 is the partial structural diagram of BOD Quick testing instrument of the present invention；
In figure: 1, sample injector 2, cleaning solution bucket 3, sample feeding pipe 4, cleaning liquid pipe
5, solenoid valve 6, threeway 7, peristaltic pump 8, flow type dissolved oxygen sensing instrument
9, thermostat 10, air pump 11, flow type BOD microbiological sensor
12, waste liquid barrel 13, main control computer 14, display interface 15, solenoid valve fixture block
16, sewer pipe 17, electromagnetism valve retainer 18, pump line 19, liquid pipe
20, gas-liquid mixed threeway 21, tracheae 22, signal measurement and processing unit.
Specific embodiment
In order to make those skilled in the art more fully understand technical solution of the present invention, with reference to the accompanying drawing and most
The present invention is described in further detail for good embodiment.
Fig. 1-2 shows a kind of BOD Quick testing instrument, including dissolved oxygen sensing module, BOD microorganism measurement module and place
Manage module；The dissolved oxygen sensing module includes sample injection unit and cleaning unit；The sample injection unit includes that sequence connects
The logical sample injector 1 for accommodating sample, sample feeding pipe for sampling 3, threeway 6 a branch, peristaltic pump 7 and flow type
Dissolved oxygen sensing instrument 8；The cleaning unit include sequential communication cleaning solution bucket 2, cleaning liquid pipe 4 and threeway 6 it is another
A branch；Another branch of the threeway 6 is connected to the peristaltic pump 7；The BOD microorganism measurement module includes
With branch, a flow type of the thermostat 9 of the flow type dissolved oxygen sensing instrument sequential communication, gas-liquid mixed threeway 20
BOD microbiological sensor 11, sewer pipe 16 and waste liquid barrel 12；Another branch of the gas-liquid mixed threeway 20 passes through
Tracheae 21 is connected to air pump 10.Solenoid valve 5 is provided on the sample feeding pipe and cleaning liquid pipe.The threeway and described
It is connected between peristaltic pump by pump line 18；Pass through liquid between the flow type dissolved oxygen sensing instrument and the thermostat 9
Pipe 19 is connected to.
The processing module includes main control computer and the online display interface of main control computer and signal measurement and processing
Unit 22；The signal measurement and processing unit and the flow type dissolved oxygen sensing instrument and flow type BOD microorganism
Sensor connection；The main control computer is connect with controller；The controller be used to control the solenoid valve on-off,
The sampling of the switch and sample injector of peristaltic pump.
The dissolved oxygen sensor of the flow type dissolved oxygen sensing instrument can be polarogram formula overlay film oxygen electrode or fluorescence method
Oxygen electrode.
Flow type BOD microbiological sensor is made of polarogram formula three-electrode structure oxygen electrode with sandwich-type microbial film；
The electrode group of the polarogram formula three-electrode structure oxygen electrode becomes: working electrode: gold；To electrode: platinum；Reference electrode: silver-chlorine
Change silver.
A kind of accurate compensation measuring method of Quick testing instrument, it is micro- using flow type dissolved oxygen sensing instrument and Formula B OD
The measuring signal of biosensor utilizes the BOD value of formula judgement sample；The formula are as follows:
BOD=F (IA)+F(△I)
F(IA)=a5×IA 5+a4×IA 4+a3×IA 3+a2×IA 2
F (△ I)=k × △ I+b
IA=△ D- △ I
Wherein:
IAThe difference of potential drop is measured for flow type dissolved oxygen instrument electrode measurement potential drop and flow type BOD microbiological sensor
Value.
A5 is potential value at the end of the measurement of flow type BOD microbiological sensor；
A4 is potential value at the end of flow type dissolved oxygen sensing instrument electrode measurement；
A3 is potential value when flow type BOD microbiological sensor initial measures；
A2 is potential value when flow type dissolved oxygen sensing instrument electrode initial measures；
△ D is flow type dissolved oxygen sensing instrument electrode measurement whole story current potential depreciation；
△ I is that flow type BOD microbiological sensor measures whole story potential difference；
K, b is coefficient of standard curve；
The value range of k value is 11.77-13.35；
The value range of b value is 2.26-2.78.
The course of work of the invention are as follows: set and show data and instrument real-time status in display interface 14.Main control computer
The automatic positioning and sample introduction switching of 13 control sample injectors 1 (being full-automatic sample injector in the present invention) and its solenoid valve 5.When booting,
Main control computer 13 controls full automatic sample injector 1 and resets, and makes positioning to No. 1 position, while controlling the opening of solenoid valve 5, when opening
Solenoid valve fixture block 15 and electromagnetism valve retainer 17 clamp sample feeding pipe 3, and sample feeding pipe 3 is made to be in closed state, and cleaning liquid pipe 4 is in circulation
State.Peristaltic pump 7 rotates, and extracts cleaning solution from cleaning solution bucket 2 by cleaning liquid pipe 4 and is sent into pump line 18 to stream by threeway 6
The import of general formula dissolved oxygen sensing instrument 8, main control computer 13 controls signal measurement and processing unit 22 acquisition flow type in real time at this time
The data of dissolved oxygen measuring device 8 carry out the dissolved oxygen parameter that processing obtains cleaning solution, and liquid is again by flow type dissolved oxygen sensing
The outlet of device 8 enters liquid pipe 19, later from the import of thermostat 9 enter, constant temperature heat preservation after from the outlet of thermostat 9 into
Enter with to the gas-liquid mixed threeway 20 connecting, is mixed with from the air in the tracheae 21 that air pump 10 is connect, gas-liquid mixed liquor enters
The import of flow type BOD microbiological sensor 10, main control computer 13 controls signal measurement at this time and processing unit 22 acquires in real time
The data of flow type BOD microbiological sensor 10 are handled, and the corresponding data of cleaning solution are obtained.Treated cleaning solution is from stream
The outlet of Formula B OD microbiological sensor 10 enters the measurement process that waste liquid barrel 12 completes cleaning solution by sewer pipe 16.
After main control computer 13 clocks between when purged, main control computer 13 controls full-automatic sample injector 1 and positions in order,
The closure of solenoid valve 5 is controlled simultaneously, and solenoid valve fixture block 15 clamps cleaning solution 4 with electromagnetism valve retainer 17 when closure, is in cleaning solution 4
Closed state, sample feeding pipe 3 are in circulation status.Peristaltic pump 7 rotates, by sample feeding pipe 3 from the corresponding position of full-automatic sample injector 1
Pipette samples water sample is sent into pump line 18 to the import of flow type dissolved oxygen measuring device 8, at this time main control computer 13 by threeway 6
The data of acquisition flow type dissolved oxygen measuring device 8 carry out handling acquisition water sample in real time for control signal measurement and processing unit 22
Dissolved oxygen parameter, liquid enters liquid pipe 19 by the outlet of flow type dissolved oxygen measuring device 8 again, later from thermostat 9 into
Mouth enters, and from the outlet of thermostat 9 entrance and the gas-liquid mixed threeway 20 to connection after constant temperature heat preservation, connect with from air pump 10
Tracheae 21 in air mixing, gas-liquid mixed liquor circulates the import of formula BOD microbiological sensor 10, at this time main control computer
The data that 13 control signal measurements and processing unit 22 acquire flow type BOD microbiological sensor 10 in real time are handled, and are obtained
The corresponding data of sample.Sample aqueous that treated from the outlet of flow type BOD microbiological sensor 10 by sewer pipe 16 into
Enter the measurement process that waste liquid barrel 12 completes cleaning solution.It circuits sequentially above step and carries out full-automatic sample introduction acquisition water sample data.
BOD Quick testing instrument according to the present invention, by dissolved oxygen sensing signal IAAnd BOD microbiological sensor signal IB
Central processing unit is accessed, this two paths of signals is subjected to calculation processing respectively, through a large amount of standard sample experimental data and reality
The control experiment of sample and traditional biochemical method on the five, establishes following empirical equation:
BOD=F (IA)+F(△I)
F(IA)=a5×IA 5+a4×IA 4+a3×IA 3+a2×IA 2
F (△ I)=k × △ I+b
IA=△ D- △ I
Wherein:
IAPotential drop is measured for dissolved oxygen electrode and BOD microbiological sensor measures the difference of potential drop.
a5Potential value at the end of for the measurement of BOD microbiological sensor.
a4Potential value at the end of for dissolved oxygen electrode measurement.
a3Potential value when BOD microbial membrane sensor initial measures.
a2Potential value when being measured for dissolved oxygen electrode initial.
△ D is that dissolved oxygen electrode measures whole story current potential depreciation.
△ I is that BOD microbial membrane sensor measures whole story potential difference.
K, b is coefficient of standard curve.
Above-mentioned F (IA) and F (IA) function is fitted all in accordance with measured data (being shown in Table 1.) by MATLAB and equation regression calculates
It determines.K, the value of b slightly has difference according to the difference of water sample to be measured, here according to practical application experience, is divided into surface water, life
Three kinds of main Types of sewage and industrial wastewater.
The value range of k value is 11.77-13.35
The value range of b value is 2.26-2.78
Table 1
Wherein, BOD5 value is the numerical value measured using traditional biochemical methods on the five, as a result registers, uses the present processes
Obtained BOD measured value infinite approach, and can satisfy the demand of automation, measurement is convenient, accurately, easy to spread.
The above is only a preferred embodiment of the present invention, for those of ordinary skill in the art, according to the present invention
Thought, there will be changes in the specific implementation manner and application range, and the content of the present specification should not be construed as to the present invention
Limitation.
Claims (6)
1. a kind of BOD Quick testing instrument, which is characterized in that including dissolved oxygen sensing module, BOD microorganism measurement module and place
Manage module；The dissolved oxygen sensing module includes sample injection unit and cleaning unit；The sample injection unit includes that sequence connects
The logical sample injector for accommodating sample, sample feeding pipe for sampling, a branch of threeway, peristaltic pump and flow type dissolution
Oxygen measuring device；The cleaning unit includes cleaning solution bucket, cleaning liquid pipe and another branch of threeway of sequential communication；Institute
Another branch for the threeway stated is connected to the peristaltic pump；The BOD microorganism measurement module includes and the stream
The thermostat of general formula dissolved oxygen sensing instrument sequential communication, a branch of gas-liquid mixed threeway, flow type BOD microbial sensitive
Device, sewer pipe and waste liquid barrel；Another branch of the gas-liquid mixed threeway is connected to by tracheae with air pump.
2. BOD Quick testing instrument according to claim 1, which is characterized in that on the sample feeding pipe and cleaning liquid pipe
It is provided with solenoid valve.
3. BOD Quick testing instrument according to claim 2, which is characterized in that the processing module include main control computer,
Online display interface and signal measurement and processing unit with main control computer；The signal measurement and processing unit with it is described
Flow type dissolved oxygen sensing instrument and flow type BOD microbiological sensor connection；The main control computer is connect with controller；
The controller stated is used to control the sampling of the on-off of solenoid valve, the switch of peristaltic pump and sample injector.
4. BOD Quick testing instrument according to claim 1, which is characterized in that the flow type dissolved oxygen sensing instrument
Dissolved oxygen sensor can be polarogram formula overlay film oxygen electrode or fluorescence method oxygen electrode.
5. BOD Quick testing instrument according to claim 1, which is characterized in that flow type BOD microbiological sensor is by polarogram
Formula three-electrode structure oxygen electrode is constituted with sandwich-type microbial film；The electrode group of the polarogram formula three-electrode structure oxygen electrode
Become: working electrode: gold；To electrode: platinum；Reference electrode: silver-silver chloride.
6. a kind of accurate compensation measuring method of the described in any item BOD Quick testing instruments of claim 1-5, which is characterized in that
The BOD of formula judgement sample is utilized using the measuring signal of flow type dissolved oxygen sensing instrument and Formula B OD microbiological sensor
Value；The formula are as follows:
BOD=F (IA)+F(△I)
F(IA)=a5×IA 5+a4×IA 4+a3×IA 3+a2×IA 2
F (△ I)=k × △ I+b
IA=△ D- △ I；
Wherein:
IA is the difference that flow type dissolved oxygen instrument electrode measurement potential drop and flow type BOD microbiological sensor measure potential drop.
A5 is potential value at the end of the measurement of flow type BOD microbiological sensor；
A4 is potential value at the end of flow type dissolved oxygen sensing instrument electrode measurement；
A3 is potential value when flow type BOD microbiological sensor initial measures；
A2 is potential value when flow type dissolved oxygen sensing instrument electrode initial measures；
△ D is flow type dissolved oxygen sensing instrument electrode measurement whole story current potential depreciation；
△ I is that flow type BOD microbiological sensor measures whole story potential difference；
K, b is coefficient of standard curve；
The value range of k value is 11.77-13.35；
The value range of b value is 2.26-2.78.
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Cited By (2)
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|---|---|---|---|---|
| CN111929265A (en) * | 2020-10-09 | 2020-11-13 | 天津市赛普新锐仪器科技有限公司 | Accurate compensation determination method for COD and/or BOD of domestic sewage |
| CN114609354A (en) * | 2022-03-07 | 2022-06-10 | 上海海恒机电仪表股份有限公司 | Automatic temperature control BOD online rapid detection system and operation method thereof |
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| Publication number | Publication date |
|---|---|
| CN109709197B (en) | 2024-01-12 |
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