CN2098031U - Microcomputer bod fast analyzer - Google Patents
Microcomputer bod fast analyzer Download PDFInfo
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- CN2098031U CN2098031U CN 91204199 CN91204199U CN2098031U CN 2098031 U CN2098031 U CN 2098031U CN 91204199 CN91204199 CN 91204199 CN 91204199 U CN91204199 U CN 91204199U CN 2098031 U CN2098031 U CN 2098031U
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- bod
- microcomputer
- biochemical reaction
- sewage
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Abstract
The utility model relates to a microcomputer BOD fast analyzer. A sewage BOD fast analyzer composed of a microcomputer control device, a constant temperature biochemical reaction box, a biochemical reaction bottle and a measuring electrode fast test sewage BOD on the basis of DO test, and can also test biochemical parameters of Rs, Kla, alpha, beta, theta, etc. The test is controlled by a microcomputer, the data is analyzed and processed by microcomputer software, and the microcomputer BOD fast analyzer is provided with a printer and a plotting and recording instrument. The microcomputer BOD fast analyzer can be used for monitoring source of contamination of industrial sewage and domestic water, controlling processing site, and designing and researching sewage processing.
Description
The utility model relates to the environmental monitoring and analysis instrument of a kind of sewage biochemical oxygen demand (BOD) fast measuring.
BOD is an important indicator of environmental monitoring and water pollution control.1912 by the proposition of the wastewater treatment council of Britain imperial family, and the standard testing analytical approach of using till today in countries in the world---BOD5 method, need be under 20 ℃ of conditions of constant temperature, through 5 days biochemical cultivations, measure 5 days forward and backward dissolved oxygen DOs (DO), calculate its difference and obtain BOD5.Its value is subjected to the influence of water sample composition (when particularly noxious material exists), pH value, temperature, culture environment condition, time, factor such as nitrated.BOD5 brings many difficulties for practical application, especially in engineering management of sewage disposal and pollution source monitoring, owing to needed 5 days to go out data, can't adapt to field control and closed loop adjustment, more can not carry out the on-line continuous monitoring.
In recent years, BOD determining instrument and fast measuring instrument, method have been carried out a large amount of investigations both at home and abroad, proposed many new equipment new methods: 1. Hua Boshi respirometer; 2. electric coulombmeter; 3. differential pressure gauge; 4.DO instrumental method; 5. microbial film oxygen electrode method; 6. aeration type oxygen electrode method.The 1st～4 quasi-instrument still needs 20 ℃ of cultivations of 5 days constant temperature, has just used instrumental method when DO tests instead.The 5th quasi-instrument is used the oxygen electrode be covered with microbial film, is a kind of rapid assay methods, but film utmost point Jiao Tender, serviceable life short (about 3～7 days) and influence is used.The 6th quasi-instrument all has product both at home and abroad, the area integral of employing oxygen electrode METHOD FOR CONTINUOUS DETERMINATION biological sludge DO change curve in the sewage biochemical reaction process is asked for BODe(can be referred to as " biochemical integral method " to distinguish with the utility model), after converting, the oxygen conversion coefficient gets the BOD value, measure fast, be applicable to the field control analysis, existing problems are because DO equilibrium value variation before and after the sample introduction influences quadrature and causes error bigger, poor repeatability; Different dilute concentration sewage sample introduction integrations are disproportionate, and the BOD linearity is not high; The high-concentration sewage test duration is long; It is time-consuming to ask for the oxygen conversion coefficient.
Purpose of design of the present utility model is that development a kind of and BOD5 have correlativity, test simple and direct, linearity height, good reproducibility, widely applicable BOD fast measuring instrument is applied to wastewater treatment on-site supervision and design studies.
Fig. 1 is the utility model structured flowchart.Among the figure: WS-constant temperature biochemical reaction case; The QB-air pump; The LJ-air flowmeter; RL-heating/refrigerator; The DB-magnetic stirrer; SP-biochemical reaction bottle; The DJ-potential electrode.YF-electrode DO signal amplifier; WF-electrode temperature signal (R
B) amplifier; The DK-electronic switch; AD-analog/digital signal conversion device; CPU-microcomputer central processing unit and peripheral components; XS-6 position light-emitting diode display; The JP-microcomputer keyboard; ZS-microcomputer working station indicator group; XZ-parameter correction device; The KZ-microcomputer is to constant temperature biochemical reaction case control interface; The DY-printer.The JL-graphic indicator.
Constant temperature biochemical reaction case WS is made up of the water-soluble gentle pump QB of constant temperature, flowmeter LJ, heating/refrigerator RL, magnetic stirrer DB etc.Air pump QB is used for the aeration to biochemical reaction bottle SP, and its flow is controlled by LJ.Mixing when magnetic stirrer DB does biochemical reaction bottle SP work is stirred, and guarantees fluid temperature, dissolved oxygen DO uniformity in the bottle.Heating/refrigerator RL is made up of resistance wire (heating with) and semiconductor cooler (refrigeration with), also can be made up of semiconductor cooler separately, makes it finish heating/refrigerating function by change external dc power supply polarity of voltage.The work of QB, DB and RL, is driven the bidirectional triode thyristor array and finishes by interface KZ by microcomputer.
Biochemical reaction bottle SP as shown in Figure 2.Among the figure: the QK-aeration opening; The QG-micropore aeration pipe; The QC-aeration tank; The HC-mixing pit; The CC-settling basin; YK-biological sludge, sewage injection port; The YL-overflow vent; Floss hole at the bottom of the FK-bottle.The water bath with thermostatic control that biochemical reaction bottle SP places WS during test, QK and air pump QB join by flowmeter LJ, for biological sludge provides oxygen.SP places stirrer in the bottom, mixes liquid under magnetic stirrer DB effect.Excessive mixed liquor is discharged at overflow vent YL behind settling basin CC.Bottom drain FK is used to change biochemical reaction bottle internal-filling liquid, for online detection and test use automatically.XK is used for the cleaning of high-velocity flow to electrode.
Electrode DJ mixes temperature compensation sensor R by polarogram type oxygen electrode or galvanic cell type oxygen electrode
AWith sensor for measuring temperature R
BForm.R
ABe used to compensate the drift of oxygen electrode film temperature, R
BMake temperature test.DJ structure such as Fig. 3,4 show.GZ-trapping seat, QZ-ventilate the seat.
The system controlled by computer processing section is made up of YF, WF, DK, AD, CPU, XS, JP, XZ, ZS, KZ.YF amplifies the dissolved oxygen DO signal of electrode output, and Yin Wendu makes the shifted signal of film generation by R
ACompensate, YF output temperature independent with the linear voltage signal of DO.WF amplifies R
BThe temperature signal of output.Under electronic switch DK control, the dissolved oxygen DO signal inputs to CPU through AD, and machine is handled the back at XS output DO, BOD, temperature, R as calculated
S, K
LaEtc. parameter.Microcomputer software is stored among the EPROM, makes control and data processing.The correction of DO, temperature, BOD is undertaken by XZ.According to the software arrangement, microcomputer is by KZ control air pump QB, stirrer DB, heating/refrigerator RL.The instrument test duty is indicated by ZS.The microcomputer working routine is selected to intervene by JP.JP is provided with that test condition writes, coefficient writes, coefficient correction, parameter are read, keys such as test function is selected, the demonstration of test process parameter.When being equipped with printer DY, JP also is provided with the printing function key.DY is used for the test process record, exportable DO change curve and test result.Chart recording instrument JL is used to write down practical DO change curve, assists the tester to carry out the parameter analysis.
BOD measures working routine: given temperature value (being generally 20～30 ℃), make WS constant temperature → add biological sludge and an amount of tap water mixed liquor → add stirrer → put DJ in SP, make just overflow → oxygenation of liquid level → DO be equilibrated at baseline → advance standard specimen → DO and drop to valley → △ DO to SP
Mark=DO
Base-DO
Paddy→ DO returns to baseline → advance sewage sample → DO and drops to valley → △
Sample=DO
Base-DO
Paddy→ BOD
Sample=BOD
5 marks△ DO
Sample/ △ DO
Mark, BOD
5 marks/ △ DO
MarkBe designated as instrument and try to achieve standard specimen coefficient → result.The method of testing that instrument adopts is " a biochemical error of measurement method ".Consider the inadaptability of standard specimen and biological sludge, ask BOD
SampleGenerally also must take advantage of " correction coefficient ".Take advantage of the BOD after the correction coefficient
SampleWith sewage sample BOD
5Fine correlativity is arranged.The sewage sample can be diluted to and standard specimen BOD do pre-service
5Suitable concentration, but also direct injected.For improving precision, shorten minute, standard specimen is mixed with 100～300mg/L concentration, and sewage sample introduction concentration is also near this scope.
Mixed liquor keto consumpting speed RS measures working routine: measure the treatment tank temperature do WS constant temperature value → WS constant temperature → get in the pond mixed liquor inject SP → add stirrer → add DDJ(band frosted mouth seat to guarantee and the SP wringing fit) → measure DO value DO
O→ at DO
OOpened timer → DO at-1.0 o'clock to descend → close timer → R during for 0.5mg/L at DO
S=(DO
O-1.5)/(△ t).DJ uses GZ and cooperates.
Biological sludge R
SThe mensuration program: give fixed temperature constant temperature → to SP add biological sludge to be measured and tap water mixed liquor → stir → add DJ make liquid level equal with overflow vent → aeration is to balance → change frosted mouth seat electrode → stop the supple of gas or steam → at DO
BaseClose timer → R when opening timer → DO at-1.0 o'clock and dropping to 0.5mg/L
S=(DO base-1.5)/(△ t).R
SDivided by sludge volume/L, be SVR; R
SRemove gMLSS/L and be SMR; R
S* 6.7 * 10
-9/ (1.01 * 10
-10) be the active component among every gMLSS (mgVSS) under the 1gMLSS/L condition.DJ adopts the GZ seat.
Oxygen switching rate K
LaMensuration program: add sewage or tap water among WS constant temperature → SP and become mixed liquor → stir → put DJ in SP → N
2Deoxygenation or biochemical oxygen consumption (are surveyed mixed liquor K
LaThe time) → DO opens timer → regularly get DO value: DO by △ t when dropping to 0 → oxygenation → DO=1.0
1, DO
2→ at DO
Base-2.0 or tap water saturated dissolved oxygen value-2.0 for measuring terminal point → K
La1=Ln ((DO
Eventually-DO
1)/(DO
Eventually-DO
2))/t
DO1-DO2, K
La2=L
n((DO
Eventually-DO
1)/(DO
Eventually-DO
3))/t
DO1-DO3→ ask K
LaMean value.
Oxygen shifts correction coefficient alpha and measures program: press K
LaThe mensuration program is surveyed K
LaSewage → survey K
LaTap water → α=K
LaSewage/K
LaTap water.
DO scale-up factor beta determination program: measure sewage saturated dissolved oxygen DO base sewage → mensuration tap water saturated dissolved oxygen DO base tap water → β=DO base sewage/DO base tap water.
Temperature coefficient υ measures program: K when measuring 20 ℃
LaBe K
La(20) → K when measuring required T temperature
LaBe K
La(T) → l
gυ=(l
gK
La(T)-l
gK
La(20))/(T-20).
The DO calibrating procedure: WS constant temperature → SP add tap water → stirring → aeration → DO be stable at baseline → table look-up saturated dissolved oxygen value → school DO → iodimetric titration correction → school DO in the water.(remove R
SOutward, DJ all uses the QZ seat during mensuration)
Above-mentioned test job program is all carried out under instrument software control automatically.After adopting automatic sampling apparatus, instrument just becomes BOD quick automatic determining instrument, can make online auto monitoring.
Compare with existing BOD fast measuring instrument, the utlity model has following characteristics:
1. instrument is easy to use, and information output is directly perceived, test automation degree height.
2. the test duration weak point is suitable for on-the-spot test and control and management, can make online auto monitoring.
3. test repeatability is high, and data linearity height has been eliminated method error.
4. test parameter is many, a tractor serves several purposes, and application surface is extensive, both can be used on the sewage treatment project field management, also can be used for the wastewater treatment scientific research and design, has wide market and higher scientific research practical value.
5. medicine is not used in biochemical method test, helps ensureing analyst's physical and mental health.
6. totally-domestic device assembling easily forms ability in batches, satisfies the environmental monitoring needs.
Embodiment:
As shown in Figure 5.Instrument title: YWC-892 type BOD microcomputer fast measuring instrument.Instrument adopts split-type structural, divides WS, WJ, JL three partly.Printer DY and WJ form one.SP adopts Fig. 2 structure, HC volume 700ml.Electrode DJ adopts polarogram type oxygen electrode, and internal-filling liquid KC1, RA are the negative temperature coefficient thermistor, and RB is AD590.CPU is the Z-80 family device among the WJ, and AD is with 14433, and YF is 7650.XZ comprises that DO proofreaies and correct, temperature correction, and 0 ℃ of correction, temperature is given, and BOD proofreaies and correct.Give 30 ℃ of fixed temperatures.Standard specimen adopts Yi Suan Na.
The BOD test result:
| The water sample source | The mud source | BOD 5 | Instrument BOD | Error % |
| Hangzhou Refinery | Refinery sludge | 89 | 80 | -11.25 |
| Hangzhou Dyeing and Printing Factory | Printing and dyeing sludge | 190 | 205 | ＋7.32 |
| Minsheng Pharmaceutical Factory, Hangzhou City. | Refinery sludge | 794 | 660 | -16.87 |
| Xinhua Paper Making Mill | Refinery sludge | 239 | 209 | -14.35 |
| Hangzhou Brewery | Printing and dyeing sludge | 465 | 497 | ＋6.4 |
Claims (3)
1, a kind of sewage biochemical oxygen demand (BOD) fast measuring instrument, form by the constant temperature biochemical reaction case (WS) that biochemical reaction bottle (SP) is housed and electrode (DJ), computer processing unit (WJ), it is characterized in that constant temperature biochemical reaction case carries out manual control by computer processing unit by nothing/contact switch array; Computer processing unit is furnished with the parameter correction device that potentiometer, dial switch or keyboard constitute, and can select for use light emitting diode (LED) display, cathode ray tube (CRT), printer (DY), chart recording instrument (JL) as the information follower; The Butterworth Hatch (XK) that biochemical reaction bottle bottom band sewage draining exit (FK) and cleaning electrode are used; Electrode has film temperature compensation sensor and sensor for measuring temperature.
2, fast measuring instrument as claimed in claim 1 is characterized in that computer processing unit adopts the bidirectional triode thyristor array of zero cross fired to the control of constant temperature biochemical reaction case.
3, fast measuring instrument as claimed in claim 1 is characterized in that electrode and biochemical reaction bottle cooperation place have the supporting base (QZ) of suitable aeration condition work or the supporting base (GZ) of trapping condition work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91204199 CN2098031U (en) | 1991-03-16 | 1991-03-16 | Microcomputer bod fast analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91204199 CN2098031U (en) | 1991-03-16 | 1991-03-16 | Microcomputer bod fast analyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2098031U true CN2098031U (en) | 1992-03-04 |
Family
ID=4914343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91204199 Withdrawn CN2098031U (en) | 1991-03-16 | 1991-03-16 | Microcomputer bod fast analyzer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2098031U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957356A (en) * | 2010-08-13 | 2011-01-26 | 北京工业大学 | Biochemical oxygen demand BOD soft measurement method based on elastic radical basis function neural network |
| CN103245758A (en) * | 2012-02-07 | 2013-08-14 | 苏州市夏龙电子技术有限公司 | Environment monitoring apparatus and method thereof |
-
1991
- 1991-03-16 CN CN 91204199 patent/CN2098031U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957356A (en) * | 2010-08-13 | 2011-01-26 | 北京工业大学 | Biochemical oxygen demand BOD soft measurement method based on elastic radical basis function neural network |
| CN101957356B (en) * | 2010-08-13 | 2013-07-10 | 北京工业大学 | Biochemical oxygen demand BOD soft measurement method based on elastic radical basis function neural network |
| CN103245758A (en) * | 2012-02-07 | 2013-08-14 | 苏州市夏龙电子技术有限公司 | Environment monitoring apparatus and method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |