CN109529600A - A method of using biofilter integrated treatment exhaust gas containing VOCs - Google Patents
A method of using biofilter integrated treatment exhaust gas containing VOCs Download PDFInfo
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The present invention relates to a kind of methods using biofilter integrated treatment exhaust gas containing VOCs, this method comprises: volcanic rock, active carbon, decomposed mushroom bran, active mushroom bran 1) are mixed and made into compounded mix；2) compounded mix layer will be formed on the porous plate inside compounded mix landfill to biofilter；3) it is passed through after humidifying fresh air in biofilter, runs 48-60h under room temperature, complete starting；4) it will be passed through in biofilter after VOCs exhaust gas humidification will be contained, runs 14-16d under room temperature, complete domestication；Adjustment exhaust gas residence time is 8-12s, continuous service.Compounded mix used in this method is not easy to collapse compacting, and the replacement cycle is long, has comfort cushioning ability and high stability；When handling exhaust gas containing VOCs, starting and acclimation period are short, and without additional inoculation and Additional nutrient solution, removal effect is good, and at low cost, operation and maintenance are simple and convenient, with good economic efficiency and environmental benefit.
Description
Technical field
The invention belongs to VOCs technical field of waste gas treatment, and in particular to a kind of to be contained using biofilter integrated treatment
The method of VOCs exhaust gas.
Background technique
Volatile organic matter (Volatile Organic Compounds, VOCs) easily leads to photochemical fog and secondary has
Machine aerosol is haze weather and O3The critical precursors of discharge, emission control ensure air quality most important.It removes
Except environmental effect, VOCs can also generate harm to human organs such as heart, lung, liver and nervous systems, cause human organ
Acute and/or slow poisoning, even carcinogenic and mutagenesis, pole is unfavorable for human health.VOCs in China's industrial process
Discharge amount it is very huge, already exceed NOx and SO2Total emission volumn.Wherein, industrial activity such as Furniture manufacture, petroleum refining, system
Medicine, organic synthesis, mechanical equipment manufacture, spray painting coating, papermaking packaging and printing industry etc. are the most important things of pollution source.Often
The VOCs seen in industrial waste gas has benzene,toluene,xylene, ethylbenzene, styrene, ethyl acetate, butyl acetate, acetone, methyl second
Base ketone, low-molecular-weight fatty acid and partially halogenated compound etc..
Existing industrial source VOCs control technology can be divided mainly into using source control as the preventive measure of target and with end
Controlling measure based on improvement.Preventive measure includes material substitution, process optimization, improvement of terms and scrap build etc., by
It updates slowly in production technology, target can not be reached in a short time, therefore the controlling measure based on end treatment obtains
To development.Existing VOCs end-of-pipe control technology includes recovery and utilization technology and degradation technique, generally for high concentration (> 5g/m3)
Or the VOCs of high recovery value is recycled using technologies such as absorption and sorption, condensation or UF membranes；And for middle low concentration
Or the VOCs that recovery value is little, degradation technique is ideal selection, such as combustion oxidation, photocatalysis, low temperature plasma
And bio-filter technology.
Bio-filter technology refers to polluted gas by porous aggregate layer, and filler surface adheres to one layer by the micro- life of different population
The biomembrane of object composition, pollutant are after gas phase transfers to biomembrane to liquid phase, through microbial physiology metabolism shift
Simple inorganic matter, if VOCs is converted into carbon dioxide and water, hydrogen sulfide is converted into sulfate, and ammonia is converted into nitrate etc..With
Other physical chemistry technologies are compared, and the advantage of bio-filter technology is: being run under normal temperature and pressure, securely and reliably；Investment and fortune
Row is at low cost, operates convenient, energy-saving and emission-reduction；There can be stronger contaminant removal capacity in low residence times.
The common bioreactor of bio-filter technology mainly has biofilter, bio-trickling filter and biological scrubber,
First two is more similar using relatively broad and technique, and maximum difference is that biofilter uses organic filler, the company of not needing
Continuous to supplement the nutrients, operating cost is low, but the indigenous microorganism of the organic filler domestication time is long, and being easy to happen biodegrade causes
Filling compaction, crushing increase, removal effect decline；Bio-trickling filter uses inorganic filler, and inertia is big, can keep for a long time compared with low pressure
Drop has advantage in terms of preventing Metabolite Accumulation and biomass control, but since inorganic filler is free of indigenous microorganism
It can not be grown for microorganism and nutrition is provided, when starting needs to be inoculated with strain, and starting speed is slow, and when operation needs liquid without interruption
Mutually supplement the nutrients, increase operation difficulty and operating cost, and it is above-mentioned both to hydrophobic organic pollutant removal effect not
It is good.
Summary of the invention
The object of the present invention is to provide a kind of method using biofilter integrated treatment exhaust gas containing VOCs, starting and
Acclimation period is short, all has good removal effect to hydrophilic, hydrophobic VOCs, easy to operate.
To achieve the goals above, the technical scheme adopted by the invention is as follows:
A method of using biofilter integrated treatment exhaust gas containing VOCs, comprising the following steps:
1) remaining edible fungus stick crushes to obtain mushroom bran after gathering in mushroom, is added mushroom bran quality 0.15%-0.25%'s
After decomposing microbial inoculum mixing, adjustment water content is 65%-70%, and compost fermentation obtains decomposed mushroom bran；
Remaining edible fungus stick directly crushes after mushroom is gathered in, and obtains active mushroom bran；
Each raw material is mixed according to following mass percent, compounded mix is made: volcanic rock 38%-40%, active carbon
10%-12%, decomposed mushroom bran 28%-32%, active mushroom bran 18%-22%；The water content for adjusting compounded mix is 55%-
60%；
2) compounded mix layer will be formed on the porous plate inside compounded mix landfill to biofilter obtained by step 1), it is multiple
The height for closing packing layer is not less than 0.5m, and filling density is 600-900kg/m3；
3) it is passed through in biofilter from below after humidifying fresh air, passes through compounded mix layer, empty bed from bottom to top
Residence time is 15-20s, runs 48-60h under room temperature, completes starting；
4) it will be passed through in biofilter after VOCs exhaust gas humidification will be contained, from bottom to top by compounded mix layer, gives up from below
The gas residence time is 15-20s, runs 14-16d under room temperature, completes domestication；Adjustment exhaust gas residence time is 8-10s, is continued
Operation.
In step 1), the edible fungus stick refers to oyster mushroom bacteria stick or needle mushroom bacteria stick.Edible fungus stick selection herein is easy
Generate the edible mushroom type of aerial hyphae, preferably oyster mushroom or needle mushroom.The original culture medium of the edible fungus stick is with corncob
Or bagasse is that the mass percent of primary raw material, corncob or bagasse in original culture medium solid material is not less than 70%.
Remaining edible fungus stick should use immediately after mushroom harvesting.It cannot such as use immediately, should be 14-16 in temperature
DEG C, save under the conditions of gas concentration lwevel 2000-3000ppm, ambient humidity 85%-90%, to remain mycelial in bacteria stick
Activity, holding time are no more than 7d.
In step 1), it is 5-15mm that bacteria stick, which is crushed to partial size,.
In step 1), the partial size of volcanic rock used is 5-15mm；The active carbon is graininess, and partial size is not less than 2.0mm.
Preferably, the partial size of the active carbon is 2.0-6.0mm.
Preferably, in step 2), the height of the compounded mix layer is 0.5-1.5m.Further, the compounded mix
The height of layer is 0.6-1.2m.The height of effective packing layer is too low, and the VOCs in exhaust gas has little time biology of the mass transfer into filler
Film, removal effect are bad；Effective packing layer is excessively high, and bottom filling is easy compacting, and too long in flow of the exhaust gas in packing layer, increases
Big pressure drop needs bigger driving force, increases cost.Under normal conditions, the pressure drop of biofilter can be just no more than 1kPa
Often operation.
Preferably, the preferred 600-800kg/m of filling density of compounded mix layer3.Loading density should be slightly bigger than compounded mix
Scattered heap density under natural conditions loads the excessive easy compacting of density, increases pressure drop；It is too small to load density, influences mass transfer.This
In invention, the filling density ratio large bulk density 50-100kg/m of compounded mix3。
In step 2), anti-blocking layer is additionally provided between porous plate and compounded mix layer, the anti-blocking layer is 10- by partial size
The gravel pack of 20mm forms, and the height of anti-blocking layer is 8-15cm.The effect of anti-blocking layer be will meet packing layer and porous plate every
It opens, prevents porous plate from blocking, while its porous structure disperses air inlet uniformity, makes together with porous plate as gas distributor
With.
In step 3) and step 4), it is intermittent from top to compounded mix spray water or buffer agent solution, control compound
The humidity of filler is not less than 45%, and pH value is not less than 5.0.Intermittence herein refers to that sprinkling in 1-2 months is primary.
Contained buffer is urea, NaOH or NaHCO in the buffer agent solution3。
In step 4), in the exhaust gas containing VOCs, the concentration of VOCs is not more than 3.0g/m3。
The method that the present invention uses biofilter integrated treatment exhaust gas containing VOCs, using volcanic rock, active carbon, decomposed
Mushroom bran, active mushroom bran are mixed with compounded mix according to a certain ratio, and wherein volcanic rock is skeleton filler, utilize its intensity and more
Pore structure plays a supportive role, and to reduce filling compaction, prevents pressure drop from increasing；Its huge specific surface area and high hole are utilized simultaneously
Rate provides attachment carrier for biomembrane, increases biomembrane area, improves mass transfer.Active carbon is adsorption stuffing, on the one hand utilizes it
Strong suction-operated adsorbs the VOCs in exhaust gas in biofilter filtering exhaust process, improves the removal ability to pollutant,
Increase antipollution load fluctuation impact capacity in operational process, improves the operation stability of biofilter；Another aspect particle
Active carbon also has biggish specific surface area and high porosity, mixes as filler with other raw materials, also can be reduced filler
Compaction increases buffering.Decomposed mushroom bran mixes after remaining edible fungus stick crushes with decomposing microbial inoculum after being gathered in by mushroom, heap
Fertilizer fermentation is made, and nutriment rich in and diversified mixed microorganism population, density is small, porosity is high, and water holding is protected
Outlet capacity is strong, and microbial population has been combined closely with nutriment, homoepitaxial, fills out after mixing with other raw materials as compound
Material uses, and diversified mixed microorganism population is easy to be tamed according to target, and growth rate is fast, and processing exhaust gas effect is good.Activity
Mushroom bran after being gathered in by mushroom remaining edible fungus stick directly crush and be made, edible fungus stick surface and inside cover with mycelium,
Compounded mix is made after mixing with other raw materials in it, in biofilter starting, domestication and initial operating stage, in moist and ventilation item
Under part, mycelium can continue to sprout in compounded mix, grow, and form aerial hyphae, can directly connect with the VOCs in exhaust gas
It touches and utilizes volatile organic matter directly by mycelium absorption, absorbs and degrade, enhance the treatment effect to hydrophobic organic compound.
The method that the present invention uses biofilter integrated treatment exhaust gas containing VOCs, by compounded mix landfill to biological mistake
Compounded mix layer is formed on porous plate inside filter, is passed through in biofilter from below after fresh air is humidified, under
And it is upper by compounded mix layer, the empty bed residence time is 15-20s, runs 48-60h under room temperature, starting can be completed.It should
Start-up course makes decomposed mushroom bran redistribute, activate in compounded mix with active mushroom bran bring diversification biotic population,
And adhere in volcanic rock, activated carbon surface, colonize, grow, biotic population Relative distribution in entire compounded mix layer is uniform, is
Later period domestication is ready.Then it will be passed through in biofilter from below after containing VOCs exhaust gas humidification, from bottom to top by multiple
Packing layer is closed, exhaust gas residence time 15-20s runs 14-16d under room temperature, completes domestication.The domestication process induces mesh
Microbial growth is marked into dominant microflora, the domestication time is short, and domestication can be completed in 14-16d, simple to operate.After the completion of domestication,
Adjustment exhaust gas residence time is 8-10s, and biofilter is still able to maintain higher pollutants removal rate, increases exhaust-gas treatment amount
And pollutional load, improve treatment effeciency.
The method that the present invention uses biofilter integrated treatment exhaust gas containing VOCs, using volcanic rock, active carbon, decomposed
Mushroom bran, active mushroom bran are mixed with compounded mix, which has preferable intensity and support force on the whole, and packing layer is not
Compacting easily is collapsed, pressure drop is small, and the replacement cycle is long；With biggish specific surface area and porosity, suction-operated is strong, so that biological mistake
Filter has good buffer capacity and high stability, and anti-pollution load impact starts and tames when handling exhaust gas containing VOCs
Period is short, can enter normal operating condition faster.Diversified biotic population is introduced by decomposed mushroom bran, passes through active mushroom bran
Edible mushroom aerial hyphae is introduced, without additional inoculation, is easy to tame；The nutriments such as organic matter rich in mushroom bran,
Good to the removal effect of VOCs without additional Additional nutrient solution, removal efficiency is high, especially improves hydrophobic organic pollutant
Treatment effect.The solid waste mushroom bran that this method takes full advantage of edible mushroom industry prepares compounded mix, turns waste into wealth, at
This is low, and operation and maintenance are simple and convenient, with good economic efficiency and environmental benefit, big suitable for capacity, contain low concentration
The industrial emission source of VOCs uses.
Specific embodiment
The present invention is described further With reference to embodiment.
In specific embodiment, edible fungus stick used is needle mushroom bacteria stick, the original culture medium of affiliated needle mushroom bacteria stick
It is composed of the following parts by weight: 75 parts of corncob (crushing), 20 parts of wheat bran, 3.5 parts of maize flour, 2 parts of land plaster, soya bean
1.5 parts of face, 1 part of calcium superphosphate, 1 part of white sugar；After white sugar is dissolved in water, mixed in proportion with remaining raw material, adjusting contains
Water is 65%, packs to obtain cultivating bag after the bored 2h of heap.Cultivating bag is sterilized, both ends are inoculated with, and grows 25- under the conditions of 20-25 DEG C
30 days mycelium can purseful, be full period bacterium germination；The cultivating bag of full period bacterium germination through management of producing mushroom (specifically: solution bag turnup, heap bag
Toga, moisturizing flower bud, lift film ventilation, toga promotees handle, harvesting mushroom, mycelium stimulation are poured water, moisturizing flower bud), to harvesting 3 batches of mushrooms.It adopts
It is 14-16 DEG C, gas concentration lwevel 2000-3000ppm, ambient humidity 85%-90% condition that the bacteria stick of mushroom, which is harvested, in temperature
Lower preservation, to maintain mycelial activity in bacteria stick.In three embodiments of lower section, harvesting mushroom to bacteria stick begins to use system
It is no more than 48h between standby decomposed mushroom bran or active mushroom bran；Decomposed mushroom bran, active mushroom bran are made to biofilter and start to start it
Between be no more than for 24 hours.
Decomposing microbial inoculum used is straw decomposing inoculant, biological (Luoyang, henan) purchased from Ou Kebaike, living bacteria count >=6,000,000,000
CFU/g, microbial inoculum use preceding brown sugar water by Stain activation.The compost fermentation is by mushroom bran mixture stacking, is highly 1.2m,
Width is 2m, and length 5m, artificial turning ventilation (every 7d turning is primary), after heap body after 30d high temperature, temperature is down to 45 DEG C
When following, crush (5-15mm) and obtain decomposed mushroom bran.
The partial size of volcanic rock used is 5-15mm, bulk density 740kg/m3, porosity 70%, specific surface area 24.3m2/g。
Active carbon used is that raw material is granular activated carbon made of anthracite, partial size 3.0-6.0mm, bulk density 557kg/m3。
In specific embodiment, particle size range refers to the screenings of the oversize of lower limit, the upper limit.Room temperature refers to 20-25 DEG C.
In specific embodiment, exhaust gas containing VOCs to be processed is the polluted gas that certain coating factory generates.Interior diameter 2.2m
Cylindrical biofilter be mounted on the roof of factory, by blower will polluted gas be oriented to humidifier after enter life
Object filter is handled.Charge flow rate is 1800m3/ h, wherein toluene concentration is 30-40mg/m3, acetone concentration 70-
85mg/m3。
When designing biofilter, volume=charge flow rate × gas residence time (gas herein of compounded mix layer
The body residence time is the gas residence time of formal operation phase)=(1800m3/ h) × (8s)=4.0m3.As needed answers
The height that the interior diameter of the volume and bioreactor of closing packing layer calculates the compounded mix layer needed is 1.052m, is taken herein
1.05m。
Embodiment 1
The method using biofilter integrated treatment exhaust gas containing VOCs of the present embodiment, comprising the following steps:
1) it is 5-10mm that remaining needle mushroom bacteria stick, which is crushed to partial size, after gathering in the 3rd batch of needle mushroom, mushroom bran is obtained, in mushroom bran
After middle addition quality is decomposing microbial inoculum (decomposing microbial inoculum is in advance through Stain activation) mixing of mushroom bran quality 0.15%, water content is adjusted
It is 65%, compost fermentation obtains decomposed mushroom bran；
It is 5-10mm that remaining edible fungus stick, which is directly crushed to partial size, after 3rd batch of needle mushroom is gathered in, and obtains active mushroom bran；
Each raw material is mixed according to following mass percent, compounded mix is made: volcanic rock 38%, active carbon 12%, corruption
Ripe mushroom bran 28%, active mushroom bran 22%；The water content for adjusting compounded mix is 60%；The bulk density of compounded mix is
553.0kg/m3；
2) gravel that partial size is 10-20mm is first loaded on the porous plate inside biofilter, loading height is 10cm,
Form anti-blocking layer；Again by compounded mix landfill to anti-blocking layer obtained by step 1), every filling 20cm height is gently pushed, and is formed
The height of compounded mix layer, final compounded mix layer (being free of anti-blocking layer) is 0.9m, and filling density is 650kg/m3；
3) it is passed through in biofilter from below after fresh air being humidified (relative humidity reaches 95% saturation degree), under
And it is upper by compounded mix layer, the empty bed residence time is 20s, runs 48h under room temperature, completes starting；
4) it is passed through biological mistake from below after exhaust gas containing VOCs to be processed being humidified (relative humidity reaches 95% saturation degree)
In filter, from bottom to top by compounded mix layer, exhaust gas residence time 20s runs 16d under room temperature, completes domestication；It adjusts
Whole exhaust gas residence time is 8s, continuous service；Compounded mix layer moisture content is controlled during operation is not less than 45%.
Embodiment 2
The method using biofilter integrated treatment exhaust gas containing VOCs of the present embodiment, comprising the following steps:
1) it is that 5-10mm obtains mushroom bran that remaining needle mushroom bacteria stick, which is crushed to partial size, after gathering in the 3rd batch of needle mushroom, in mushroom bran
After middle addition quality is decomposing microbial inoculum (decomposing microbial inoculum is in advance through Stain activation) mixing of mushroom bran quality 0.20%, water content is adjusted
It is 68%, compost fermentation obtains decomposed mushroom bran；
It is 5-10mm that remaining edible fungus stick, which is directly crushed to partial size, after 3rd batch of needle mushroom is gathered in, and obtains active mushroom bran；
Each raw material is mixed according to following mass percent, compounded mix is made: volcanic rock 40%, active carbon 10%, corruption
Ripe mushroom bran 32%, active mushroom bran 18%；The water content for adjusting compounded mix is 60%；The bulk density of compounded mix is
579.7kg/m3；
2) gravel that partial size is 10-20mm is first loaded on the porous plate inside biofilter, loading height is 10cm,
Form anti-blocking layer；Again by compounded mix landfill to anti-blocking layer obtained by step 1), every filling 20cm height is gently pushed, and is formed
The height of compounded mix layer, final compounded mix layer (being free of anti-blocking layer) is 0.9m, and filling density is 650kg/m3；
3) it is passed through in biofilter from below after fresh air being humidified (relative humidity reaches 95% saturation degree), under
And it is upper by compounded mix layer, the empty bed residence time is 18s, runs 54h under room temperature, completes starting；
4) it is passed through biological mistake from below after exhaust gas containing VOCs to be processed being humidified (relative humidity reaches 95% saturation degree)
In filter, from bottom to top by compounded mix layer, exhaust gas residence time 18s runs 16d under room temperature, completes domestication；It adjusts
Whole exhaust gas residence time is 8s, continuous service；Compounded mix layer moisture content is controlled during operation is not less than 45%.
Embodiment 3
The method using biofilter integrated treatment exhaust gas containing VOCs of the present embodiment, comprising the following steps:
1) it is that 5-10mm obtains mushroom bran that remaining needle mushroom bacteria stick, which is crushed to partial size, after gathering in the 3rd batch of needle mushroom, in mushroom bran
After middle addition quality is decomposing microbial inoculum (decomposing microbial inoculum is in advance through Stain activation) mixing of mushroom bran quality 0.25%, water content is adjusted
It is 70%, compost fermentation obtains decomposed mushroom bran；
It is 5-10mm that remaining edible fungus stick, which is directly crushed to partial size, after 3rd batch of needle mushroom is gathered in, and obtains active mushroom bran；
Each raw material is mixed according to following mass percent, compounded mix is made: volcanic rock 39%, active carbon 11%, corruption
Ripe mushroom bran 30%, active mushroom bran 20%；The water content for adjusting compounded mix is 60%；The bulk density of compounded mix is
568.1kg/m3；
2) gravel that partial size is 10-20mm is first loaded on the porous plate inside biofilter, loading height is 10cm,
Form anti-blocking layer；Again by compounded mix landfill to anti-blocking layer obtained by step 1), every filling 20cm height is gently pushed, and is formed
The height of compounded mix layer, final compounded mix layer (being free of anti-blocking layer) is 0.9m, and filling density is 650kg/m3；
3) it is passed through in biofilter from below after fresh air being humidified (relative humidity reaches 95% saturation degree), under
And it is upper by compounded mix layer, the empty bed residence time is 15s, runs 60h under room temperature, completes starting；
4) it is passed through biological mistake from below after exhaust gas containing VOCs to be processed being humidified (relative humidity reaches 95% saturation degree)
In filter, from bottom to top by compounded mix layer, exhaust gas residence time 15s runs 16d under room temperature, completes domestication；It adjusts
Whole exhaust gas residence time is 8s, continuous service；Compounded mix layer moisture content is controlled during operation is not less than 45%.
In above-described embodiment, biofilter used is in the setting of the top of compounded mix layer for spraying to compounded mix layer
The flusher of liquid.It is monthly primary to compounded mix layer spray water by uppermost spray device during biofilter is run,
Water-spraying amount is the 10%-20% of compounded mix layer quality (above-described embodiment takes 10%)；Biofiltration is detected before spray water
The pH value of diffusate or fine crushing material below device from porous plate exudation drippage is then added in spray water if pH value is lower than 5.0
Appropriate buffer is neutralized.
Through detecting, embodiment 1-3 uses the treatment effect of the method for biofilter integrated treatment exhaust gas containing VOCs such as
Shown in table 1.VOCs concentration is detected with portable gas chromatography.
1 embodiment 1-3 of table uses the treatment effect of the method for biofilter integrated treatment exhaust gas containing VOCs
Since above-mentioned detection process calculate number of days (without start-up course) being passed through exhaust gas containing VOCs, since compounded mix has
There are stronger suction-operated and higher adsorption capacity, tames the preceding 1-3d of process to the removal effect of pollutant mainly by compound
The suction-operated of filler is contributed, removal rate >=80%, on day 4 when basically reach adsorption saturation, therefore detection for the first time is logical
Enter exhaust gas containing VOCs the 5th day, detection in every 5 days is primary, until system even running.
As it can be seen from table 1 the biofilter of embodiment 1-3 is being passed through the exhaust gas containing VOCs of coating factory generation and is running
At the 5th day, to the removal rate of toluene between 67%-71%, to the removal rate of acetone between 73%-79%, exclude compound
The suction-operated of filler illustrates that toluene and the microorganism of acetone are digested in compounded mix is not proliferated into superior microorganism also, biology
Filter is also in the domestication stage.When running the 10th day, the biofilter of embodiment 1-3 divides the removal rate of toluene and acetone
Not between 80%-85% between 88%-92%, there is biggish growth when compared to the 5th day, illustrate to disappear in compounded mix
The microorganism for changing toluene and acetone is increasingly becoming superior microorganism.When running the 15th day, the biofilter pair of embodiment 1-3
Respectively reaching 91.5% or more and 99.2% or more to the removal rate of toluene and acetone, (toluene insoluble is hydrophobic contact scar in water
Object, relative to this water soluble contaminants of acetone, removal rate is relatively lower, the reason is that the hydrophobicity influence of toluene is filled out compound
Mass-transfer efficiency in material), domestication is completed.For the treating capacity for improving biofilter, shortens gas residence time to 8s, passed through
After crossing the phase, continued to test at the 20th day, in keeping air inlet toluene and acetone concentration in a certain range under the premise of, embodiment
The biofilter of 1-3 is not less than 92.2% to the removal rate of toluene, is not less than 99.6% to the removal rate of acetone, system is normal
And efficient operation.Testing result shows the method for the invention using biofilter integrated treatment exhaust gas containing VOCs to useless
VOCs in gas has good removal effect, and bioreactor starting and domestication time are short, and operation and maintenance are simple, cost
It is low, it is suitble to promote the use of.
In above-described embodiment, the pressure drop that biofilter operates normally is no more than 200Pa (pressure drop wave between 80-180Pa
It is dynamic), it is far below 1kPa.It is out of service if the pressure drop of biofilter is more than 1kPa (after operation 3-5), take compounded mix layer
The middle filler (choosing the packing layer that the segment thickness is 0.3m) between the 0.1-0.4m of layer top is retained, remaining is given up, and gives up
Partial quality is supplied and after mixing by additional fillers, is recharged and is started, can restore to operate normally in 72h.It is described
Additional fillers are consistent with corresponding compounded mix raw material composition, the difference is that using in active mushroom bran alternative composite filler
Decomposed mushroom bran.
Claims (8)
1. a kind of method using biofilter integrated treatment exhaust gas containing VOCs, it is characterised in that: the following steps are included:
1) remaining edible fungus stick crushes to obtain mushroom bran after gathering in mushroom, and the decomposed of mushroom bran quality 0.15%-0.25% is added
After microbial inoculum mixing, adjustment water content is 65%-70%, and compost fermentation obtains decomposed mushroom bran；
Remaining edible fungus stick directly crushes after mushroom is gathered in, and obtains active mushroom bran；
Each raw material is mixed according to following mass percent, compounded mix is made: volcanic rock 38%-40%, active carbon 10%-
12%, decomposed mushroom bran 28%-32%, active mushroom bran 18%-22%；The water content for adjusting compounded mix is 55%-60%；
2) compounded mix layer will be formed on the porous plate inside compounded mix landfill to biofilter obtained by step 1), it is compound to fill out
Bed depth is not less than 0.5m, and filling density is 500-900kg/m3；
3) it is passed through in biofilter from below after humidifying fresh air, from bottom to top by compounded mix layer, empty bed is stopped
Time is 15-20s, runs 48-60h under room temperature, completes starting；
4) it will be passed through in biofilter from below after VOCs exhaust gas humidification will be contained, from bottom to top by compounded mix layer, exhaust gas stops
Staying the time is 15-20s, runs 14-16d under room temperature, completes domestication；Adjustment exhaust gas residence time is 8-10s, lasting to transport
Row.
2. the method according to claim 1 using biofilter integrated treatment exhaust gas containing VOCs, it is characterised in that:
In step 1), the edible fungus stick refers to oyster mushroom bacteria stick or needle mushroom bacteria stick.
3. the method according to claim 1 using biofilter integrated treatment exhaust gas containing VOCs, it is characterised in that:
In step 1), it is 5-15mm that bacteria stick, which is crushed to partial size,.
4. the method according to claim 1 using biofilter integrated treatment exhaust gas containing VOCs, it is characterised in that:
In step 1), the partial size of volcanic rock used is 5-15mm；The active carbon is graininess, and partial size is not less than 2.0mm.
5. the method according to claim 1 using biofilter integrated treatment exhaust gas containing VOCs, it is characterised in that:
In step 2), anti-blocking layer, the gravel that the anti-blocking layer is 10-20mm by partial size are additionally provided between porous plate and compounded mix layer
It fills, the height of anti-blocking layer is 8-15cm.
6. the method according to claim 1 using biofilter integrated treatment exhaust gas containing VOCs, it is characterised in that:
In step 3) and step 4), it is intermittent from top to compounded mix spray water or buffer agent solution, control the wet of compounded mix
Degree is not less than 45%, and pH value is not less than 5.0.
7. the method according to claim 6 using biofilter integrated treatment exhaust gas containing VOCs, it is characterised in that:
Contained buffer is urea, NaOH or NaHCO in the buffer agent solution3。
8. the method according to claim 1 using biofilter integrated treatment exhaust gas containing VOCs, it is characterised in that:
In step 4), in the exhaust gas containing VOCs, the concentration of VOCs is not more than 3.0g/m3。
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