CN2101868U

CN2101868U - Bods tester

Info

Publication number: CN2101868U
Application number: CN 91212725
Authority: CN
Inventors: 郭敬慈
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-05-24
Filing date: 1991-05-24
Publication date: 1992-04-15

Abstract

The utility model relates to a BODs tester, which belongs to a testing apparatus which can scan a peak area by ultraviolet light to measure the pollution intensity of organic waste water. The tester is composed of an ultraviolet scan device, a high speed centrifugation device, an aeration culturing device, a temperature controller, etc. Under the temperature condition of 30-32DEG. C, after the aeration is cultured for 2-4 hours, the ultraviolet light carries out the scan; the peak area is obtained to determine the BODs value and the apparatus thoroughly solves the problems that the testing time of the tester is long, the test is carried out in a closing device to not really reflect the DEG of the pollution of the organic waste water, etc. Simultaneously the degradation rate of the waste water which is difficult to degrade can reach 40-55%, so the utility model is suitable for measuring the dyeing waste water, the bast fibre spinning waste water, the paper making waste water, the pesticide waste water, the coking waste water, etc. The technology is easy to master and the error can be eliminated.

Description

BODS tester

The BODs tester belongs to a kind of testing tool of ultraviolet ray intensity.

For a long time, BOD ₅The overall target of organic contamination degree is weighed in conduct always, and has designed multiple testing tool for it, as inspection pressure type coulombmeter, Hnch2173 type BOD analyzer, Vernimmen BOD analyzer, BOD rapid tester, microbiological sensor BOD analyzer or the like.The subject matter that above-mentioned various instrument exists is, 1. all under airtight cultivation conditions, measure, therefore the dissolved oxygen DO in cultivating also constantly reduces and can not get replenishing, and hinders metabolism breeding and the organic degraded of microorganism, thereby can not truly reflect the pollution level of organic wastewater; 2. part adopts the BOD analyzer of electrode, and some type can not be applicable to the mensuration of high-concentration waste water, and the short problem of electrode life is not resolved always simultaneously; 3. the minute of five days biological oxygen demands is long, the practical significance of technology out of hand; Therefore it is fast to design a kind of finding speed, can truly reflect the testing tool of complicated organic wastewater environmental pollution degree again.

The BODs analyzer of the utility model design has solved the problems referred to above.

The technical scheme that realizes task of the present invention is: the BODs testing tool is by UV scanning, high speed centrifugation, aeration is cultivated with temperature control several sections and is formed, described aeration cultivation has comprised by the negative pressure generator of piston (2) and aspiration pump (1) formation and the aeration of contacting mutually more than two or two cultivates also (3), two pipes are gone in aeration cultivation also (3) interior skewer, one of them cultivate and in have a pipe to link to each other with negative pressure generator, another root is terminal to be pipe and another cultivation of porous air inlet head (4) and to link to each other or communicate with atmosphere by air strainer (7); The temperature control part branch that is used to control the aeration cultivation temperature is made up of well heater (5), thermoelectric corner (8) and several parts of automatic temperature control device (11), cultivate the BODs tester of forming with temperature control by UV scanning, high speed centrifugation, aeration and can also can only control the UV scanning part by the whole tester of computer system control.

Below in conjunction with accompanying drawing in detail the present invention is described in detail.

Figure one BODs tester synoptic diagram;

Figure two aerations are cultivated and the temperature controller structural drawing.

The utility model adopts ultraviolet light sweep measuring organic contamination intensity. Have organic pollutants in the waste water, just produce Optical Absorption, organic constitution is more complicated, the more close visible region of its ultraviolet light absorbing wavelength, the composition of organic pollution, concentration difference are just different by peak height or peak area that absorption optical produces. Because baroque organo-functional group must have absorption at ultraviolet region in the organic pollution, and the suspension in the opposite waste water has absorption at visible region, therefore to adopt wavelength be that the ultraviolet region of 400-200nm is the scanning wave band to the design, the degree that can reflect organic contamination is not subjected to again the impact of other suspension; The impact that microorganism may exist, high-speed separation can be eliminated; Because the pollutant component in the organic wastewater is mixture, the peak area that therefore absorbs with ultraviolet is expressed as suitable simultaneously, adopts the ultraviolet light scanning technique, and influence factor is less, and the reappearance of measurement result is good, the design's that Here it is the most outstanding characteristics place.

Cause evaluated error because the suspension in the waste water and microorganism produce to disturb to the mensuration of ultraviolet light absworption peak area, so the design adopts 14000 rev/mins speed high speed centrifugation in order to separating suspension and microorganism.

Measuring Organic Pollution intensity at 30-32 ℃ temperature and aeration condition of culture is another characteristics of the design. BOD₅Analyzer is to measure in closed system, and organic matter degradation rate is difficult to improve like this, can not reflect truly organic contamination intensity, and employing aeration culture apparatus, to guarantee under the sufficient inorganic nutrients prerequisite abundant aeration, not cut-off O in the microbial degradation process₂, not only can improve degradation rate but also the autoxidation of activated sludge can not occur. Aeration is cultivated can adopt the vibration aeration, the modes such as negative pressure ventilation or pressure-vent, and negative pressure ventilation device of the present utility model is a kind of simple and feasible aeration mode. Aspiration pump in the negative pressure generator (1) makes to be cultivated and the generation negative pressure, and air is passed into the blake bottle from porous air inlet head (4) through filter (7), gets final product ultraviolet light scanning after cultivating through 4 hours aeration like this, measures BODs.

The BODs tester of the utility model design, each running program can be used hand-guided, also can adopt computer control, but ultraviolet light scanning and calculating thereof adopt computer system more superior.

The running program of BODs tester is as follows:

1, gets 5-10ml waste water,,, get supernatant liquor, try to achieve maximum extinction value in 400-200nm wave band UV scanning to remove suspension with the centrifugal 3-6 of 14000 rev/mins speed minute.Should remain on about 1.5 according to extinction value, determine the multiple that the waste water sample need dilute.

2, by the extension rate of obtaining, get the some milliliters of waste water sample, to nearly 1000ml, add inorganic nutrients agent Ca, each 3ml of Mg, Fe with treated distilled water diluting, damping fluid 5ml is diluted to 1L.

3, get above-mentioned liquid 150ml, add through the active sludge 3ml of the no organic wastewater of washing with through the dominant bacteria liquid 1ml of enlarged culture, centrifuging is immediately got supernatant liquor and is done ultraviolet light scanning, tries to achieve peak area S ₁, try to achieve COD by standard method simultaneously before.

4, get the aforementioned waste water sample that has added active sludge and dominant bacteria liquid in addition, aeration was cultivated 4 hours under 30-32 ℃ of temperature conditions, got the supernatant liquor high speed centrifugation 3-6 minute, and the centrifugal supernatant of learning from else's experience scans once more, and its peak area is S ₂, try to achieve COD by standard method simultaneously after.

According to before the COD that measures under certain waste water condition, behind the COD, and the peak area S of ultraviolet light scanning ₁S ₂, can obtain the reduction coefficient K of this waste water:

K=(COD _Before-COD _After)/(S ₁-S ₂)

Again according to reduction coefficient K and the poor (S of peak area ₁-S ₂) can obtain BODs:

BODs＝K.ΔSmg／L

Adopt the pollution level of the BODs tester mensuration organic wastewater of the utility model design, only need 2-4 hour time; And be to measure 30 ℃ of left and right sides conditions, needn't lower the temperature small investment; BOD ₅Mensuration because the organic oxidative phosphorylation efficient of different structure difference, the different error of organic matter degradation rate can't be eliminated, but this method is because the conversion of K value but can be eliminated the errors of bringing owing to ε (molar absorptivity) difference; Can reach 40-55% to the degradation rate that is difficult to degrading waste water, and technology grasps easily, be suitable for measuring the various plant chimney stalks that have organic pollutants; Once can draw simultaneously the quite total organic contamination intensity of COD(), rest COD (the organic contamination intensity that still can not degrade) and BODs(biological chemistry oxygen utilization), so environmental benefit, remarkable in economical benefits.

Example one:

Get certain textile printing and dyeing factory biochemical treatment tank waste water, through centrifuging, scanning for the first time (λ=200-400nm); Maximum extinction value is 3.84, and wastewater dilution is become 1/4, adds the inorganic nutrients agent, cultivates the active sludge and the 2#4# dominant bacteria of domestication, centrifuging immediately, scanning once more, its peak area S ₁=384, aeration is cultivated 4 hours (t=30 ℃), centrifuging, scanning for the third time, its peak area S ₂=126, △ S=258 has obtained K=1.25.

BODs=1.25 * 258 * 4=1290mg/L then

Checking: be COD before the same sample culturing ₁=1860mg/L is COD after the cultivation ₂=625mg/L, △ COD ≈ BODs=1235mg/L only differs 55mg/L.

Example two:

Get certain jute mill's waste water, press the operation of example one step, measure S at the BODs tester ₁=403, S ₂=119, △ S=284, K=1.69, BODs=479mg/L

Checking: COD ₁=846, COD ₂=344, △ COD=502mg/L differs 23mg/L

Example three:

Get waste water from pesticide factory pond water sample, measure BODs=254mg/L with the BODs tester, checking △ COD ≈ BODs=312mg/L differs 58mg/L.(shorter to the agricultural chemicals waste water domestication time in this example) so it is bigger to produce error by active sludge and dominant bacteria.

Example four:

Synthetic standard sample: glutamic acid glucose, theoretical BOD ₅Be 200 ± 37mg/L.Cultivate 2 hours mensuration BODs=232mg/L with this tester.

Synthetic standard sample: phenol 1%+ glucose 1%, conventional BOD ₅Method, measuring the result is 299.5,287.1,346.5,317.0,317.0,340.0, average out to 317.8mg/L, the BODs that measures with this instrument is 326.8,359.4,347.5, average out to 344.6mg/L.

Claims

1, the instrument-BODs tester of the complicated organic wastewater pollution intensity of a kind of fast measuring is characterized in that being controlled several parts with temperature and being formed by UV scanning, high speed centrifugation, aeration cultivation.

2,, it is characterized in that the aeration cultivation has comprised negative pressure generator that is made of piston (2) and aspiration pump (1) and the aeration culture flask (3) of contacting mutually more than two or two by the described BODs tester of claim 1.

3, by the described BODs tester of claim 2, it is characterized in that the interior skewer of aeration culture flask (3) goes into two pipes, a pipe in one of them culture flask communicates with negative pressure generator, and another root end links to each other with another culture flask for the pipe of porous air inlet head (4) or communicates with atmosphere by air strainer (7).

4,, it is characterized in that the temperature control part branch of controlling the aeration cultivation temperature partly is made up of well heater (5), thermoelectric corner (8) and automatic temperature control device (11) 1L by the described BODs tester of claim 1.

5,, it is characterized in that cultivating and control the BODs tester that several parts form with temperature and can also can only control the UV scanning part by the computer system control whole instrument by UV scanning, high speed centrifugation, aeration by the described BODs tester of claim 1.