CN1020960C - Method for quickly measuring Biochemical Oxygen Demand (BOD) of sewage - Google Patents
Method for quickly measuring Biochemical Oxygen Demand (BOD) of sewage Download PDFInfo
- Publication number
- CN1020960C CN1020960C CN 91101749 CN91101749A CN1020960C CN 1020960 C CN1020960 C CN 1020960C CN 91101749 CN91101749 CN 91101749 CN 91101749 A CN91101749 A CN 91101749A CN 1020960 C CN1020960 C CN 1020960C
- Authority
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- China
- Prior art keywords
- bod
- sewage
- standard specimen
- bod5
- biochemical reaction
- Prior art date
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- Expired - Fee Related
Links
- 239000010865 sewage Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 14
- 239000001301 oxygen Substances 0.000 title claims abstract description 14
- 238000005842 biochemical reaction Methods 0.000 claims abstract description 10
- 239000010802 sludge Substances 0.000 claims abstract description 7
- 238000005273 aeration Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 3
- 238000003556 assay Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 3
- 239000001632 sodium acetate Substances 0.000 claims description 2
- 235000017281 sodium acetate Nutrition 0.000 claims description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims 1
- 230000007423 decrease Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 14
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 238000003723 Smelting Methods 0.000 abstract 1
- 239000004753 textile Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000004043 dyeing Methods 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229960000583 acetic acid Drugs 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012362 glacial acetic acid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 235000011091 sodium acetates Nutrition 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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- Activated Sludge Processes (AREA)
Abstract
The method for quickly measuring the Biochemical Oxygen Demand (BOD) of the sewage is to continuously measure the variation of the dissolved oxygen concentration of the biological sludge in the biochemical reaction process of the sewage. The BOD parameter corresponding to BOD5 was determined rapidly. The testing time is 5-10 minutes. The whole measuring process is carried out under the conditions of constant temperature, constant speed stirring and constant aeration. According to the method, a BOD rapid measuring instrument can be conveniently formed, and the method is suitable for monitoring light textiles, food, petrifaction, medical sanitation, ore smelting, energy and domestic sewage, and is particularly suitable for monitoring pollution sources, field control management of sewage treatment engineering and online testing.
Description
The present invention relates to the environment supervision instrument analytical approach of a kind of sewage biochemical oxygen demand (BOD) fast measuring.
BOD is an important indicator of environmental monitoring and water pollution control.Proposed by the wastewater treatment council of Britain imperial family in 1912, and the standard testing of using till today in countries in the world analytical approach-BOD5 method.Need to measure 5 days forward and backward dissolved oxygen DOs (DO) through 20 ℃, 5 days biochemical cultivations of constant temperature, calculated difference obtains.Its value is subjected to the influence of water sample composition, 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,, field control and closed loop adjustment can't be adapted to, more on-line monitoring can not be carried out owing to needed 5 days to go out data.
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 equipments, new method: 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 5 days constant temperature culture, has used instrumental method when DO tests instead.The 5th quasi-instrument is used the oxygen electrode that covers microbial film, be a kind of rapid assay methods, but film is extremely tender and lovely, and lack and the influence application serviceable life.The 6th quasi-instrument adopts the area integral (can be referred to as " biochemical integral method ") of METHOD FOR CONTINUOUS DETERMINATION biological sludge DO change curve in the sewage biochemical reaction process, 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, influence quadrature and cause error bigger, poor repeatability; Different dilute concentration sewage integrations are disproportionate.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.
Task of the present invention is that design a kind of and BOD5 have correlativity, test simple and direct, the linearity, good reproducibility, widely applicable, the BOD rapid assay methods of employing aeration type oxygen electrode method can be applicable to wastewater treatment field control and on-line monitoring.
Assay method:
Get and tamed or do not tamed biological sludge in right amount
↓
Put into the biochemical reaction bottle
↓
In bottle, add tap water to the bottle overflow till
↓
Make the biochemical reaction bottle 20～30 ℃ of a certain temperature in the left and right sides
Value constant temperature
↓
To mixed liquor constant current amount aeration in the biochemical reaction bottle+
Constant speed stirs
↓
Get oxygen electrode and measure the DO curve
↓
DO is stable at equilibrium state DOa
↓
Preparation standard specimen (its BOD concentration and prediction sewage
BOD is suitable)
↓
Quantitatively advance standard specimen
↓
DO drops to DOb
↓
DO recovers under aeration, is stable at DOc
↓
Ask the standard specimen coefficient:
K
Mark=(BOD5 mark)/(DOa-DOb)
↓
The sewage sample pre-service becomes 30～170% of standard specimen BOD
About be advisable, go out water sample and increase the sample introduction multiplying power
↓
Quantitatively advance the sewage sample
↓
DO drops to DOd
↓
Ask sewage BOD.BOD
Sample=K
Mark
(DO
c-DO
d). correction factor
Fig. 1 is seen in the DO curvilinear motion during mensuration.Can carry out at Fig. 2 device during mensuration.WS-constant temperature oven among Fig. 2; The SP-reaction bulb; The DB-stirrer; The DJ-potential electrode; The QB-air pump; The YC-DO instrument; The JL-registering instrument.Can be described as " biochemical error of measurement method ".
The characteristics of the inventive method are: 1. instrument is realized conveniently according to customer requirements, can being designed to the instrument-water bath with thermostatic control of plain type BOD fast measuring, stirrer, air pump and DO analyzer, also can form full-automatic BOD on-line monitoring instrument.2. test operation is easy, need not preliminary work.As long as start is treated can test after the DO balance.3. the test duration weak point helps site controling management.4. the standard specimen source is abundant, preparation is convenient, the similar low carbon chain straight chain hydrocarbon material of all genus sodium acetates all can be used as standard specimen.5. good reproducibility, linearity height have correlativity with DOB5, are fit to the sewage analaysis test request.
Embodiment:
Example 1. is pressed Fig. 2 device design YWC type, BOD microcomputer fast measuring instrument.The apparatus structure block diagram is seen Fig. 3.Among the figure: WS-constant temperature biochemical reaction case; The QB-air pump; The LJ-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 amplifier; The DK-electronic switch; AD-simulating signal/digital signal converter; CPU-microcomputer central processing unit and peripheral components; The DY-printer; The JL-registering instrument; The XS-LED display; The JP-keyboard; ZS-working station indicator group; XZ-parameter correction device; The KZ-microcomputer is to the WS control interface.SP volume 700ml.DJ is made up of polarogram type oxygen electrode+temperature sensor AD 590 and film compensating resistance.30 ℃ of constant temperature set-points.Standard specimen is a sodium acetate.When measuring Minsheng Pharmaceutical Factory, Hangzhou City.'s sewage, the standard specimen weight concentration is 1500mg/L, and during Hangzhou Brewery sewage, the standard specimen weight concentration is 1000mg/L, and other is 500mg/L.
Example 2 is pressed Fig. 2 and is formed test unit by DO analyzer, water bath with thermostatic control, biochemical reaction bottle, magnetic stirrer and micro air pump.Given 20 ℃ of temperature.Do not connect registering instrument.The employing glacial acetic acid is a standard specimen.Standard specimen concentration 250mg/L, instrument has good rapidity.
Test shows that example 1 and example 2 have fine consistance.
The BOD test findings:
Sewage source mud source BOD5 instrument BOD error (%)
Hangzhou Refinery oil refining sewerage treatment pond 89 80-11.25
Hangzhou Dyeing and Printing Factory's dyeing and printing sewage treatment pond 190 205+7.32
Refinery sludge of Minsheng Pharmaceutical Factory, Hangzhou City. 794 660-16.87
Refinery sludge of Xinhua Paper Making Mill 239 209-14.35
Hangzhou Brewery printing and dyeing sludge 465 497+6.4
The contrast of " biochemical integral method " and " biochemical error of measurement method " test value linearity (water sample: Hangzhou Dyeing and Printing Factory's treatment tank water outlet):
The biochemical integral method of the biochemical error of measurement method of sample size (ml)
Ratio
% linearity BOD linearity BOD
Sewage quantity (ml) △ DO BOD integration BOD BOD5
Proportional error % proportional error %
100 20∶20 1.016 130 100 +1.6 9.226 128 100 0 128
75 20∶15 0.733 92.4 71.1 -3.3 5.958 82.7 64.6 -13.9 96
50 20∶10 0.57 71.8 56.1 +12.2 3.425 47.5 37.1 -25.8 64
37.5 20∶7.5 0.40 50 39.0 +4.2 2.037 28.2 22.0 -41.3 48
25 20∶5 0.257 32.4 25.3 +1.3 0.860 11.5 9.0 -64.1 32
12.5 20∶25 0.123 15.5 12.1 -3.1 0.231 3.2 2.5 -80.0 16
6.25 20∶1.25 0.073 9.2 0.072 +15 0.093 1.3 1.0 -83.8 8
Claims (3)
1, a kind of sewage BOD rapid assay methods, under constant temperature, constant speed stirring, constant aeration condition, it is characterized in that: by DO variable quantity in the biochemical reaction process in the oxygen electrode METHOD FOR CONTINUOUS DETERMINATION biochemical reaction bottle, by asking for before the sewage sample introduction to be measured the difference △ DO sewage sample of DO decline valley after the DO equilibrium value and sample introduction, behind standard specimen BOD coefficient conversion, obtain the BOD value corresponding with BOD5; The aerobe mud that biological sludge can be selected domestication for use or not tame; Standard specimen adopts acetate or sodium acetate.
2, BOD rapid assay methods as claimed in claim 1 is characterized in that standard specimen BOD coefficient equals standard specimen BOD5 divided by △ DO standard specimen.
3, BOD rapid assay methods as claimed in claim 1 or 2, it is characterized in that standard specimen can be processed into sewage sample to be measured estimate the suitable Different Weight concentration of BOD5 value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91101749 CN1020960C (en) | 1991-03-16 | 1991-03-16 | Method for quickly measuring Biochemical Oxygen Demand (BOD) of sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91101749 CN1020960C (en) | 1991-03-16 | 1991-03-16 | Method for quickly measuring Biochemical Oxygen Demand (BOD) of sewage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1059206A CN1059206A (en) | 1992-03-04 |
| CN1020960C true CN1020960C (en) | 1993-05-26 |
Family
ID=4905248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91101749 Expired - Fee Related CN1020960C (en) | 1991-03-16 | 1991-03-16 | Method for quickly measuring Biochemical Oxygen Demand (BOD) of sewage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1020960C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327968C (en) * | 2005-06-01 | 2007-07-25 | 北京清能创新科技有限公司 | Constant tempeature reactor for reactor type biochemical oxygen-demand rapid measuring instrument |
| CN101477105B (en) * | 2009-01-16 | 2012-01-25 | 淮阴工学院 | Rapid measuring method for high-salt industrial waste water BOD |
| DE102009001861A1 (en) * | 2009-03-25 | 2010-09-30 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Method for operating an analysis device |
| 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 |
| 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 |
-
1991
- 1991-03-16 CN CN 91101749 patent/CN1020960C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1059206A (en) | 1992-03-04 |
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