CN102258940A - Method for controlling excessive growth or eliminating aged biological membranes of microorganisms in biological filter tower - Google Patents
Method for controlling excessive growth or eliminating aged biological membranes of microorganisms in biological filter tower Download PDFInfo
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- CN102258940A CN102258940A CN2011101008628A CN201110100862A CN102258940A CN 102258940 A CN102258940 A CN 102258940A CN 2011101008628 A CN2011101008628 A CN 2011101008628A CN 201110100862 A CN201110100862 A CN 201110100862A CN 102258940 A CN102258940 A CN 102258940A
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Abstract
The invention provides a method for controlling the excessive growth or eliminating aged biological membranes of microorganisms in a biological filter tower. The method provided by the invention comprises the following steps: when the biological filter tower is operated until the processing efficiency is reduced to 80% or below, closing a waste gas source; and carrying out irradiation and photolysis processing on air with the relative humidity less than 3% by an ultraviolet lamp for 50-150 seconds, introducing the air into the biological filter tower for operation processing for 1-1.5 hours, and opening the waste gas source to continue the operation processing. The invention utilizes an ozone online production method based on an ultraviolet photolysis course to eliminate aged biological membranes or control the excessive growth of microorganisms, overcomes the defects of long recovery phase of bioactivity, difficulty in elimination course controlling and the like of the traditional method, and solves the problems of high cost for utilizing an ozone generating device, difficulty in local material usage and the like. The method provided by the invention can be applied to a biological purification process for processing various gaseous organic pollutants, thereby achieving the effects of controlling the excessive growth and eliminating aged biological membranes of microorganisms in a biological reactor.
Description
(1) technical field
The present invention relates to a kind of control microorganism excess growth and the method for removing aging biomass in the biological filtering tower combined working, belong to environmental contaminants and administer technical field.
(2) background technology
Bioanalysis is handled organic exhaust gas and is had advantages such as expense is low, easy to operate, non-secondary pollution, extensively has been subjected to many researchers' attention in recent years.Biofiltration tower and bio-trickling filter are the exemplary device of biological method purification organic exhaust gas, and both utilize the purpose that reaches eliminating organic pollutant attached to the microbial metabolism effect on the filler.Some researchers find, after biological filtering tower combined working stable operation a period of time, can occur pollutant mass-transfer performance variation, bed body pressure drop rising, part usually and phenomenons such as anaerobic zone occur, thereby cause that biological filtering tower combined working removes performance and descend.The reason that causes this result mainly is because interior microorganism excess growth of biological filtering tower combined working or the biomembrane that some are aging fail in time to come off, and makes the interior biomembrane of biological filtering tower combined working excessively accumulate, and has influenced the removal ability of organic pollution.Therefore, control reasonable microbial biomass, to avoid packing layer to stop up be a critical process factor keeping biological filtering tower combined working operation steady in a long-term.
In order to solve the drawback that exists in the biological filtering tower combined working actual motion, many researchers have proposed the aging biomembrane of removal or the method for control microorganism excess growth, mainly contain regular backwash, biological filtering tower combined working stoppage in transit, add the chemical substance of inhibition growth of microorganism etc.More easily realize in actual applications though backwash regularly and biological filtering tower combined working are stopped transport, have many drawbacks.If backwash liquid intensity is excessive, not only some aging biomembranes have obtained removal, and some have the microorganism of degrading activity also along with flushing liquid has left biological filtering tower combined working, simultaneously in order to reach removal effect preferably, flushing liquid generally is acid solution or alkali lye, and this makes biological filtering tower combined working successfully start the time that needs experience long again; And the mode that adopts biological filtering tower combined working to stop transport is removed aging biomembrane, promptly utilize the microorganism endogenous respiration that the microorganism mortality is reached and remove aging biomembranous effect, the time that generally needs a couple of days, this just must utilize other treating apparatus to substitute its cleaning organic waste gas in biological filtering tower combined working stoppage in transit process.Therefore, research and develop in the suitable control filter tower microorganism excess growth or removing aging biomembranous method substitutes above-mentioned traditional control method, the improvement that applies to actual industrial waste gas for biological filtering tower combined working technology on a large scale has great importance.
(3) summary of the invention
For solving deficiency and the defective that conventional method exists, the invention provides a kind of method of removing aging biomembrane and control microorganism excess growth.
The technical solution used in the present invention is:
The aging biomembranous method of microorganism excess growth or removal in a kind of control biological filtering tower combined working, described method comprises: biological filtering tower combined working moves to treatment effeciency and drops to 80% when following, close exhaust gas source, with relative humidity less than 3% air after 50～150s (time of staying of air in uviol lamp photodissociation device) is handled in the ultra violet lamp photodissociation, feed to move in the biological filtering tower combined working and handled 1～1.5 hour, the interior nutrient solution spraying intensity of filter tower maintains 20～25Lmin in the processing procedure
-1M
-3,, connect exhaust gas source afterwards again and continue the operation processing so that the biomembrane that comes off in time leaves biological filtering tower combined working; Described ultraviolet light source is that dominant wavelength is low pressure mercury lamp (power 18w or the 36w of 185nm, the Beijing Electrooptic Source Inst), for preventing that ozone from causing too much injury to microorganism, light source adopts intermittent operation in the processing procedure, is specially: open 2～3min and close 2～3min alternately.The photodissociation process can adopt the photodissociation device, and uviol lamp is placed the container central authorities that air inlet, gas outlet are housed, and air enters from air inlet, is passed into the biological filtering tower combined working from the gas outlet discharge behind ultra violet lamp.
The present invention as preconditioning technique, utilizes strong oxidizer-ozone (O of its photodissociation process generation with VUV photodissociation technology
3), remove aging biomembrane or control microorganism excess growth, to guarantee biological filtering tower combined working operation steady in a long-term.
Described biological filtering tower combined working is after the bed characteristic improves, recover to remove performance at short notice for accelerating biological filtering tower combined working, ultraviolet photolysis technology can be moved a period of time with the biological filtering tower combined working process integration, be specially: described biological filtering tower combined working is after air-treatment, exhaust gas source is earlier after described ultra violet lamp is handled 10～30s, feed in the biological filtering tower combined working and handle, reach 95% to the waste gas clearance and remove ultraviolet light source when above, waste gas directly feeds and proceeds exhaust-gas treatment in the biological filtering tower combined working.Utilize that photodissociation organic contamination deposits yields is easily degraded, water-soluble material preferably accelerates in the filter tower biologically active and recovers, and makes biological filtering tower combined working restart success, can remove uviol lamp photodissociation device.For the phenomenon that prevents microorganism excess growth in the biological filtering tower combined working takes place once more, the low concentration ozone that can regularly utilize the photodissociation air to produce (is not higher than 20mgm
-3) directly feed biological filtering tower combined working, the examination growth of microorganism situation decision lamp source intermittently operated time, thus reach growth of microorganism speed in the control filter tower, keep biological filtering tower combined working operation steady in a long-term.
Described method is used to control microorganism excess growth in the biological filtering tower combined working, and described air feeds in the biological filtering tower combined working after handling 50～75s with the uviol lamp photodissociation, and ozone concentration was not higher than 20mgm during photodissociation this moment was given vent to anger
-3
Described method is used to remove aging biomembrane, and described air feeds in the biological filtering tower combined working after handling 120～150s with the uviol lamp photodissociation, and ozone concentration was not less than 100mgm during photodissociation this moment was given vent to anger
-3
The inventive method is applicable to the conventional waste gas treatment process that carries out with biological filtering tower combined working, and preferred, handled waste gas is australene or chlorobenzene.
Beneficial effect of the present invention is mainly reflected in: utilize the online ozoniferous method of ultraviolet photolysis process as removing aging biomembrane or control microorganism excess growth, both overcome conventional method and had drawbacks such as long such as biologically active convalescence, that the removal process is wayward, and also solved and utilized that the ozone generating-device expense is higher, problem such as be difficult for gathering materials on the spot; This method can be applied to handle in the biological purifying process of all kinds of gaseous organic pollutants, thereby reaches microorganism excess growth and the aging biomembranous effect of removal in the control bioreactor.
(4) description of drawings
Fig. 1 is the influence of ultraviolet photolysis ozone treatment to the australene clearance;
Fig. 2 is the influence of ultraviolet photolysis associating biological filtering tower combined working operation to the australene clearance.
(5) specific embodiment
The present invention is described further below in conjunction with specific embodiment, but protection scope of the present invention is not limited in this:
The size of biological filtering tower combined working is among each embodiment: internal diameter 12cm, and height overall 110cm, the packing layer effective depth is 60cm.Biofiltration tower adopts the mixture of peat and wood chip as filler, intermittent shower, and intensity is 180mLmin
-1, every day 5min; Bio-trickling filter adopts polyurethane foam as filler, sprays continuously, and intensity is 180mLmin
-1The Photoreactor dischargeable capacity is 2.25L, and 1～4 high ozone low pressure mercury lamp (36w, dominant wavelength is 185nm) is placed by central authorities, utilizes the power supply power supply that electronic relay is housed, and intermittently opens and closes (open 2min and close 3min alternately) operation to keep the lamp source.
Embodiment 1:
Bio-trickling filter unit bed pressure drop behind operation 130d of handling australene rises to 236.5Pam
-1, filter tower inner transmission matter situation and microbial activity are suppressed, about the removal decrease in efficiency to 45% of australene.Cut off australene this moment the source takes place, the air that adopts relative humidity＜3% is as reaction medium, and (instantaneous ozone concentration is about 105mgm in the direct feeding bio-trickling filter behind ultraviolet photolysis 120s
-3), strengthen nutrient solution spraying intensity (22.5Lmin in the filter tower simultaneously
-1M
-3) (nutrient solution is formed: NH
4Cl 860mg/L, NaNO
32250mg/L, K
2HPO
4600mg/L, KH
2PO
4150mg/L, MgCl
260mg/L, CaCl
26mg/L, Fe
2SO
43mg/L, solvent are water, and pH 7.2), 1h is kept in whole intermittently operated.The unit bed pressure drop drops to 142Pam behind the 1h
-1, and measured the intermittently biomass of photodissociation operation front and back unit filler, be respectively 10.97kgm
-3Filler stem and 8.75kgm
-3Filler stem.By aforesaid operations, aging biomembrane obtains removing in the bio-trickling filter, and the packing layer clogging improves.Remove the ultraviolet photolysis device, recover the bio-trickling filter normal operating condition, open australene the source takes place, keeping inlet concentration is 600mgm
-3, waste gas time of staying in filter tower is that 102s removal efficient is approximately 35%.Behind 7～10d, whole removing is removed efficient and is risen to 90%, apparently higher than improving preceding processing horizontal.
Embodiment 2:
Aforementioned operation is with embodiment 1.Be dripping ability, ultraviolet photolysis and the bio-trickling filter cooperation a few days that filter tower recovers to handle australene waste gas rapidly behind the aging biomembrane of quickening removal.In the meantime, concentration is 600mgm
-3, relative humidity be 35～40% australene waste gas behind ultraviolet photolysis (exhaust gas residence time 18s), product enters in the follow-up filter tower (exhaust gas residence time is 81s) with the residue australene.Some are water-soluble better and the material (aldehydes, ketone, carboxylic acids etc.) of easily biological-degradable because the australene photolytic product mostly is, can accelerate microbial activity rejuvenation in the filter tower, impel biomembrane to form once more, whole clearance rises to (Fig. 1) more than 85% by 55% behind the 4d.Treat that clearance reaches at 95% o'clock and removes the ultraviolet photolysis device, be stabilized in about 92% behind the clearance 2d.Compare with embodiment 1, the time of restarting shortens about 1/2.
Embodiment 3:
Biofiltration tower unit bed pressure drop behind operation 130d of handling australene rises to 490Pam
-1, filter tower inner transmission matter situation and microbial activity are suppressed, about the removal decrease in efficiency to 78% of australene.Cut off australene this moment the source takes place, the air that adopts relative humidity＜3% is as reaction medium, and (instantaneous ozone concentration is about 100mgm in the direct feeding biofiltration tower behind ultraviolet photolysis 120s
-3), strengthen spraying intensity (21Lmin in the filter tower simultaneously
-1M
-3), 1h is kept in whole intermittently operated.The unit bed pressure drop drops to 424Pam behind the 1h
-1, and measured the intermittently biomass of photodissociation operation front and back unit filler, be respectively 15.27kgm
-3Filler stem and 14.59kgm
-3Filler stem.By aforesaid operations, aging biomembrane obtains removing in the biofiltration tower, and the packing layer clogging improves.Remove the ultraviolet photolysis device, recover the biofiltration tower normal operating condition, open australene the source takes place, keeping inlet concentration is 600mgm
-3, waste gas time of staying in filter tower is that 102s removal efficient is approximately 75%.Behind 4～5d, whole removing is removed efficient and is risen to 92%, apparently higher than improving preceding processing horizontal.
Embodiment 4:
Aforementioned operation is with embodiment 3.Ability, ultraviolet photolysis and the biofiltration tower cooperation a few days of recovering to handle australene waste gas rapidly for the filtration tank of accelerate removing behind the aging biomembrane.In the meantime, concentration is 600mgm
-3, relative humidity be 35～40% australene waste gas behind ultraviolet photolysis (exhaust gas residence time 18s), product enters in the follow-up filter tower (exhaust gas residence time is 81s) with the residue australene.Some are water-soluble better and the material (aldehydes, ketone, carboxylic acids etc.) of easily biological-degradable because the australene photolytic product mostly is, can accelerate microbial activity rejuvenation in the filter tower, impel biomembrane to form once more, whole clearance rises to (Fig. 2) more than 95% by 75% behind the 2d.
Embodiment 5:
Set up the identical bio-trickling filter of two covers respectively and handle australene waste gas, carry out inoculation membrane formation with the activated sludge through domestication to dripping filter tower, biofilm starts successfully behind about 25d.Two cover bio-trickling filters are kept identical service condition, unique different be that wherein the every 20d of a cover adopts intermittently photodissociation operation that the growth of microorganism in the filter tower is controlled.Intermittently the condition of photodissociation operation is: the air of humidity＜3% is as reaction medium, and the photodissociation time of staying is 45～70s, and ozone concentration was 18mgm during photodissociation was given vent to anger
-3About, total intermittently operated time is 1.5h.During whole service (150d), the bio-trickling filter unit bed pressure drop of control microorganism excess growth is all the time at 133～160Pam
-1In fluctuation, promptly after gap photodissociation operation pressure drop by 160Pam
-1Drop to 135Pam immediately
-1, the removal performance of australene is also comparatively stable; And for the uncontrolled bio-trickling filter of growth of microorganism, though early stage, (30～100d) removal performances were comparatively stable, almost identical with another set of filter tower, but increase along with running time, the unit bed pressure drop raises gradually, the removal performance of australene also descends thereupon, and when filter tower moved to 150d, pressure drop rose to 300.5Pam
-1, remove below the decrease in efficiency to 30%.This shows that the method can better be controlled microbial growth situation in the biological filtering tower combined working, keep filter tower operation steady in a long-term.
Embodiment 6:
Set up the identical bio-trickling filter of two covers respectively and handle chlorobenzene waste gas, carry out inoculation membrane formation with the activated sludge through domestication to dripping filter tower, biofilm starts successfully behind about 18d.Two cover bio-trickling filters are kept identical service condition, unique different be that wherein the every 15d of a cover adopts intermittently photodissociation operation that the growth of microorganism in the filter tower is controlled.Intermittently the condition of photodissociation operation is: the air of humidity＜3% is as reaction medium, and the photodissociation time of staying is 45～70s, and ozone concentration was 18mgm during photodissociation was given vent to anger
-3About, total intermittently operated time is 1h.During whole service (120d), the bio-trickling filter unit bed pressure drop of control microorganism excess growth is all the time at 145～178Pam
-1Interior fluctuation, the removal performance of chlorobenzene is also comparatively stable; And for the uncontrolled bio-trickling filter of growth of microorganism, though early stage, (30～90d) removal performances were comparatively stable, almost identical with another set of filter tower, but increase along with running time, the unit bed pressure drop raises gradually, the removal performance of chlorobenzene also descends thereupon, and when filter tower moved to 120d, pressure drop rose to 324Pam
-1, remove below the decrease in efficiency to 25%.This shows that the method can better be controlled microbial growth situation in the biological filtering tower combined working, keep filter tower operation steady in a long-term.
Claims (5)
1. control microorganism excess growth or the aging biomembranous method of removal in the biological filtering tower combined working for one kind, described method comprises: biological filtering tower combined working moves to treatment effeciency and drops to 80% when following, close exhaust gas source, with relative humidity less than 3% air after 50～150s is handled in the ultra violet lamp photodissociation, feed to move in the biological filtering tower combined working and handled 1～1.5 hour, connect exhaust gas source continuation operation afterwards again and handle; Described ultraviolet light source is that dominant wavelength is the low pressure mercury lamp of 185nm, and light source intermittent operation in the processing procedure is specially: open 2～3min and close 2～3min alternately.
2. the method for claim 1, it is characterized in that described biological filtering tower combined working is after air-treatment, exhaust gas source is earlier after described ultra violet lamp is handled 10～30s, feed in the biological filtering tower combined working again and handle, reach 95% to the waste gas clearance and remove ultraviolet light source when above, waste gas directly feeds and proceeds exhaust-gas treatment in the biological filtering tower combined working.
3. the method for claim 1 is characterized in that described method is used to control microorganism excess growth in the biological filtering tower combined working, and described air feeds in the biological filtering tower combined working after handling 50～75s with the uviol lamp photodissociation.
4. the method for claim 1 is characterized in that described method is used to remove aging biomembrane, and described air feeds in the biological filtering tower combined working after handling 120～150s with the uviol lamp photodissociation.
5. method as claimed in claim 1 or 2 is characterized in that handled waste gas is australene or chlorobenzene.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106334437A (en) * | 2015-11-09 | 2017-01-18 | 宁波工程学院 | Method for removing aged biomebrane in biological filtration tower through ultrasonic waves |
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| CN106334437A (en) * | 2015-11-09 | 2017-01-18 | 宁波工程学院 | Method for removing aged biomebrane in biological filtration tower through ultrasonic waves |
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