CN209673712U - BOD Quick testing instrument - Google Patents
BOD Quick testing instrument Download PDFInfo
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- CN209673712U CN209673712U CN201920122590.3U CN201920122590U CN209673712U CN 209673712 U CN209673712 U CN 209673712U CN 201920122590 U CN201920122590 U CN 201920122590U CN 209673712 U CN209673712 U CN 209673712U
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Abstract
The utility model belongs to environmental monitoring field, and in particular to a kind of BOD Quick testing instrument, BOD Quick testing instrument include 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.The utility model introduces the dissolved oxygen compensating module of flow type dissolved oxygen sensing instrument, and gives equation of higher degree compensated curve, improves the precision and accuracy of BOD measurement.
Description
Technical field
The utility model belongs to environmental monitoring field, and in particular to a kind of BOD Quick testing instrument.
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.The measuring method of the utility model uses microbiological sensor method, ginseng
According to Chinese Ministry of Environmental Protection's HJ/T86-2002 relevant criterion, [the measurement microbiological sensor of water quality biochemical oxygen demand (BOD) (BOD) is quickly measured
Method].Currently, the quick instrument of microbiological sensor method BOD be used widely at home by environmental monitoring field.By prolonged application
Summary of experience discovery, when low concentration surface water BOD measures (especially in low temperature season), since oxygen in water is supersaturated,
If do not taken warming up treatment, supersaturated dissolved oxygen is difficult to drive away, and can carry out error to the measuring band of BOD.
Utility model content
The purpose of the utility model is to overcome defect in the prior art, a kind of BOD Quick testing instrument and essence are provided
Really compensation measuring method, is particularly suitable for the Fast And Accurate Determination of low concentration BOD surface water.
In order to achieve the above object, the utility model adopts the following technical solutions:
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 utility model has the beneficial effects that
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 the utility model introduces flow type dissolved oxygen
The dissolved oxygen compensating module of measuring instrument, can effectively eliminate above-mentioned error, and give equation of higher degree compensated curve, improve BOD
The precision and accuracy of measurement, the measurement especially for low concentration surface water BOD are possessed of higher values.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the utility model BOD Quick testing instrument；
Fig. 2 is the partial structural diagram of the utility model BOD Quick testing instrument；
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 the technical solution of the utility model, with reference to the accompanying drawing
The utility model is described in further detail with most preferred 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 working process of the utility model is as follows: data and instrument real-time status are set and shown in display interface 14.Master control
Computer 13 controls the automatic positioning and sample introduction switching of sample injector 1 (being full-automatic sample injector in the utility model) and its solenoid valve 5.
When booting, main control computer 13 controls full automatic sample injector 1 and resets, and makes to position to No. 1 position, while controlling the opening of solenoid valve 5,
Solenoid valve fixture block 15 and electromagnetism valve retainer 17 clamp sample feeding pipe 3 when opening, and sample feeding pipe 3 is made to be in closed state, clean at liquid pipe 4
In circulation status.Peristaltic pump 7 rotates, and extracts cleaning solution from cleaning solution bucket 2 by cleaning liquid pipe 4 and enters pump line 18 by threeway 6
It send to the import of flow type dissolved oxygen sensing instrument 8, main control computer 13 controls signal measurement at this time and processing unit 22 acquires in real time
The data of flow type dissolved oxygen measuring device 8 carry out the dissolved oxygen parameter that processing obtains cleaning solution, and liquid is dissolved by flow type again
The outlet of oxygen measurement device 8 enters liquid pipe 19, enters later from the import of thermostat 9, from thermostat 9 after constant temperature heat preservation
Outlet enters with to the gas-liquid mixed threeway 20 connecting, and mixes with from the air in the tracheae 21 that air pump 10 is connect, gas-liquid mixes
Liquid circulates the import of formula BOD microbiological sensor 10, and main control computer 13 controls signal measurement at this time and processing unit 22 is real
When acquisition flow type BOD microbiological sensor 10 data handled, obtain the corresponding data of cleaning solution.Cleaning that treated
Liquid enters the measurement that waste liquid barrel 12 completes cleaning solution by sewer pipe 16 from the outlet of flow type BOD microbiological sensor 10
Journey.
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 involved in the utility model, by dissolved oxygen sensing signal IAAnd BOD microbiological sensor letter
Number IBAccess central processing unit, this two paths of signals be subjected to calculation processing respectively, through a large amount of standard sample experimental data and
The control experiment of actual 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 content is only the preferred embodiment of the utility model, for those of ordinary skill in the art, according to this reality
With novel 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
Limitations of the present invention.
Claims (5)
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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920122590.3U CN209673712U (en) | 2019-01-24 | 2019-01-24 | BOD Quick testing instrument |
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|---|---|---|---|
| CN201920122590.3U CN209673712U (en) | 2019-01-24 | 2019-01-24 | BOD Quick testing instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111077203A (en) * | 2020-01-13 | 2020-04-28 | 清池水环境治理科技发展(天津)有限公司 | Dual-channel microbial sensor type BOD rapid determinator for emergency detection |
-
2019
- 2019-01-24 CN CN201920122590.3U patent/CN209673712U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111077203A (en) * | 2020-01-13 | 2020-04-28 | 清池水环境治理科技发展(天津)有限公司 | Dual-channel microbial sensor type BOD rapid determinator for emergency detection |
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