CN115814584B - Diatomite-based composite filler for strengthening performance of biotrickling filter - Google Patents
Diatomite-based composite filler for strengthening performance of biotrickling filter Download PDFInfo
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- CN115814584B CN115814584B CN202211275873.4A CN202211275873A CN115814584B CN 115814584 B CN115814584 B CN 115814584B CN 202211275873 A CN202211275873 A CN 202211275873A CN 115814584 B CN115814584 B CN 115814584B
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- 239000000945 filler Substances 0.000 title claims abstract description 77
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000002131 composite material Substances 0.000 title claims abstract description 59
- 238000005728 strengthening Methods 0.000 title abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000000243 solution Substances 0.000 claims abstract description 25
- 239000008367 deionised water Substances 0.000 claims abstract description 18
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 18
- 238000004132 cross linking Methods 0.000 claims abstract description 15
- 241000894006 Bacteria Species 0.000 claims abstract description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 14
- 239000003895 organic fertilizer Substances 0.000 claims abstract description 14
- 230000000593 degrading effect Effects 0.000 claims abstract description 12
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 11
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 11
- 239000000661 sodium alginate Substances 0.000 claims abstract description 11
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 11
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 10
- 239000011259 mixed solution Substances 0.000 claims abstract description 10
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 239000002904 solvent Substances 0.000 claims abstract description 6
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical class OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 5
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 17
- 239000008096 xylene Substances 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 241000589291 Acinetobacter Species 0.000 claims description 3
- 241000607534 Aeromonas Species 0.000 claims description 3
- 241000604933 Bdellovibrio Species 0.000 claims description 3
- 241001453380 Burkholderia Species 0.000 claims description 3
- 241000186359 Mycobacterium Species 0.000 claims description 3
- 241001494479 Pecora Species 0.000 claims description 3
- 241000589516 Pseudomonas Species 0.000 claims description 3
- 241000316848 Rhodococcus <scale insect> Species 0.000 claims description 3
- 210000003608 fece Anatomy 0.000 claims description 3
- 239000010871 livestock manure Substances 0.000 claims description 3
- 239000012855 volatile organic compound Substances 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 241000721069 Duchesnea Species 0.000 claims 1
- 241000736131 Sphingomonas Species 0.000 claims 1
- 241001249784 Thermomonas Species 0.000 claims 1
- 238000001816 cooling Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 235000016709 nutrition Nutrition 0.000 abstract description 6
- 230000035764 nutrition Effects 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 13
- 235000015097 nutrients Nutrition 0.000 description 6
- 244000005700 microbiome Species 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000001580 bacterial effect Effects 0.000 description 3
- 238000010170 biological method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 241000193830 Bacillus <bacterium> Species 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- -1 lava Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 150000003408 sphingolipids Chemical class 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012573 2D experiment Methods 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- 241000206761 Bacillariophyta Species 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000007836 KH2PO4 Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000035 biogenic effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910000396 dipotassium phosphate Inorganic materials 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 description 1
- 229910000357 manganese(II) sulfate Inorganic materials 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 239000006174 pH buffer Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000005180 public health Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000003053 toxin Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses a diatomite-based composite filler for strengthening the performance of a biotrickling filter. Adding polyvinyl alcohol and sodium alginate into deionized water, heating, stirring and dissolving. And (3) placing the obtained solution to room temperature, adding diatomite, calcium carbonate, organic fertilizer and degrading bacteria, and uniformly stirring. The obtained diatomite-based composite filler mixed solution is dripped into a crosslinking solution, wherein the crosslinking solution is a saturated boric acid solution containing 2% CaCl 2 by mass concentration, and the solvent is water. The volume ratio of deionized water to crosslinking solution in the diatomite-based composite filler mixed solution is 1:10. immobilized at 4 ℃, taken out, washed three times by deionized water, and then the diatomite-based composite filler is prepared. The filler has good water holding performance and nutrition slow release capability, has long service cycle, can shorten the starting time of the biotrickling filter, and strengthens the impact load and stagnation resistance of the biotrickling filter.
Description
Technical Field
The invention belongs to the field of waste gas treatment, and in particular relates to a diatomite-based composite filler taking diatomite as a framework and polyvinyl alcohol and sodium alginate as adhesives and a preparation method thereof.
Background
Xylene is a hydrophobic volatile organic compound and is widely applied to various chemical products such as paint, adhesive, printing ink, dye, plastics, synthetic fibers and the like. During the manufacturing process they are released into the environment, possibly posing a hazard to the ecological environment and public health. Compared with the traditional treatment methods, such as photocatalysis, catalytic combustion and the like, the biological method has the advantages of low operation cost, environmental friendliness, no secondary pollution and the like. Compared with other biological methods, the biological drip filtration method has the advantages that the liquid phase is controlled, the pH value, the nutrient supply and the toxic metabolites can be controlled finely, and thus, the better purifying effect can be achieved.
The filler is used as a key component of a biological method and is a carrier for microorganism adhesion growth. The fillers commonly used at present are mainly classified into natural fillers and artificial fillers. Natural fillers, including compost, lava, perlite, and the like, have been used in biological treatment systems. Pall rings, polyurethane foams, etc. are relatively common synthetic fillers. Compared with the above filler, the immobilized filler can improve the activity of microorganisms, and the microorganism provided by the immobilized material has good reusability,
Diatomite is a biogenic siliceous sedimentary rock, is mainly composed of remains of ancient diatoms, can be applied to multiple fields of environmental protection, medicine, construction and the like, and has huge development and application potential. Diatomite has the characteristics of rich reserves in China, low cost, multiple pores, large specific surface area, stable chemical properties and the like. In the aspect of environmental control, researches are focused on modifying diatomite to treat sewage and obtain good effects, but the researches are less in waste gas treatment.
According to the present situation, the diatomite-based composite filler with nutrition slow-release capability is prepared by using diatomite as a framework and using polyvinyl alcohol and sodium alginate as adhesives to successfully immobilize the nutrition substances and degrading bacteria. The diatomite-based composite filler has long service life, good water holding performance, simplified starting steps of the biotrickling filter, enhanced impact load resistance of the biotrickling filter, and shortened recovery time of normal purification performance after the biotrickling filter is subjected to faults, production stoppage or maintenance.
Disclosure of Invention
The invention provides a preparation method of diatomite-based composite filler, which comprises the following specific preparation steps: adding polyvinyl alcohol and sodium alginate into deionized water, heating and stirring at 90 ℃ to dissolve. And (3) placing the obtained solution to 30 ℃, adding diatomite, calcium carbonate, organic fertilizer and xylene degrading bacteria, and uniformly stirring. The obtained diatomite-based composite filler mixed solution is dripped into a crosslinking solution, wherein the crosslinking solution is a saturated boric acid solution containing 2% CaCl 2 by mass concentration, and the solvent is water. The volume ratio of deionized water to crosslinking solution in the diatomite-based composite filler mixed solution is 1:10. immobilized at 4 ℃, taken out, washed three times by deionized water, and then the diatomite-based composite filler is prepared. Wherein the raw materials comprise the following components in percentage by mass: 42-48 parts of diatomite, 33-39 parts of polyvinyl alcohol, 6-12 parts of sodium alginate, 1-7 parts of calcium carbonate, 1-7 parts of xylene degrading bacteria and 1-3 parts of organic fertilizer.
The diatomite in the diatomite-based composite filler is used as a basic skeleton, so that the strength and the service life of the diatomite-based composite filler are improved, the adsorption performance of the diatomite-based composite filler is improved, the transfer of gas is facilitated, the contact area of microorganisms and the gas is increased, the degradation efficiency is improved, and the load impact resistance of the filler is improved; the organic fertilizer is sheep manure fermented organic fertilizer, and can provide nutrition sources for microorganisms; polyvinyl alcohol and sodium alginate are used as binders; calcium carbonate is used as a pH buffer substance for adjusting pH; the xylene degrading bacteria are Pseudomonas, sphingolipid, burkholderia, rhodococcus, acinetobacter, aeromonas, bdellovibrio, single island bacillus, mycobacterium, thiooto-thobacillus, and thermal monad, and the weight ratio of the 11 bacteria is 19.0:9.1:10.4:1.3:2.7:4.6:3.2:3.3:1.8:1.6:3.7.
The invention has the advantages that:
1. the diatomite-based composite filler prepared by the method takes diatomite as a basic skeleton, and the prepared diatomite-based composite filler has good water retention performance;
2. The diatomite-based composite filler prepared by the method has long service life, and the pressure loss of the biotrickling filter is low after the diatomite-based composite filler is put into use, so that the running cost can be reduced;
3. the diatomite-based composite filler prepared by the method can simplify the membrane hanging step of the biological trickling filtration tower and shorten the membrane hanging time.
4. The diatomite-based composite filler prepared by the invention can strengthen the impact load resistance of the biotrickling filter 5. The diatomite-based composite filler prepared by the invention can effectively shorten the time of the biotrickling filter for recovering the normal purification performance after stopping and lagging, thereby solving the problems of failure, production stopping and efficiency reduction of the biotrickling filter after maintenance in practical application;
6. the diatomite-based composite filler prepared by the invention has good nutrition slow release performance.
Drawings
FIG. 1 is a graph showing the water loss rate of a composite filler, diatomaceous earth, and ceramsite over time.
FIG. 2a is a graph showing the results of an impact load test, wherein the gas residence time was 28s, and the inlet concentration was increased from 1200 mg.m -3 to 2200 mg.m -3.
FIG. 2b is a graph showing the results of an impact load test, wherein the gas residence time was changed from 28s to 15s, and the inlet concentration was 250mg ·m-3.
FIG. 3a is a graph showing the results of a 7d experiment in which a biotrickling filter was stopped, the inlet gas concentration was 1200 mg.m -3, and the gas residence time was 53s.
FIG. 3b is a graph showing the results of a 2d experiment in which the biotrickling filter was stopped, the inlet gas concentration was 700 mg.m -3, and the gas residence time was 28s.
FIG. 4 is a graph showing the results of the experiment for the stagnation of 81d in the biotrickling filter, wherein the inlet gas concentration is 250 mg.m -3, the gas residence time before the stagnation of the biotrickling filter is 28s, and the gas residence time after the restarting is 53s.
Fig. 5 is a graph of nutrient slow release performance test of diatomite-based composite filler.
FIG. 6 is a graph of the results of the reuse of the diatomite-based composite filler.
Detailed Description
Description of the preferred embodiments
The diatomite-based composite filler is prepared according to the following embodiment:
(1) 12g of polyvinyl alcohol and 3g of sodium alginate are added into 95ml of deionized water at the rotating speed of 800r/min, and the mixture is stirred in a water bath kettle at the temperature of 90 ℃ until the mixture is completely dissolved.
(2) The solution was cooled to 30℃and 15g of 200 mesh diatomaceous earth, 1g of calcium carbonate, 0.37g of an organic fertilizer and 5ml of a bacterial liquid were added thereto, respectively, followed by stirring. The 5ml bacterial liquid takes 1g of xylene degrading bacteria as solute and 5ml of deionized water as solvent. The concentration of the bacterial liquid is that the volume ratio of the mass of the xylene degrading bacteria to the deionized water is 0.2g to 1ml.
(3) The obtained diatomite-based composite filler mixed solution is dripped into a crosslinking solution, wherein the crosslinking solution is a saturated boric acid solution containing 2% CaCl 2 by mass concentration, and the solvent is water. The volume ratio of deionized water to crosslinking solution in the diatomite-based composite filler mixed solution is 1:10.
(4) Crosslinking for 8h at 4 ℃.
(5) Taking out the completely fixed diatomite-based composite filler, and washing with deionized water for 3 times to obtain the diatomite-based composite filler.
(6) The organic fertilizer is sheep manure fermented organic fertilizer, the mark number is Wan pesticide fertilizer (2018) standard word 5949, the execution standard is NY/T525-2021, the organic fertilizer is powdery, and the mass ratio of nitrogen, phosphorus and potassium to organic matters in the components is 1:9, the purchasing company is the security badge rich biological organic fertilizer limited company.
(7) The xylene degrading bacteria are Pseudomonas, sphingolipid, burkholderia, rhodococcus, acinetobacter, aeromonas, bdellovibrio, single island bacillus, mycobacterium, thiooto-thobacillus, and thermal monad, and the weight ratio of the 11 bacteria is 19.0:9.1:10.4:1.3:2.7:4.6:3.2:3.3:1.8:1.6:3.7.
The preparation of the diatomite-based composite filler was performed according to this scheme in the following cases.
Second embodiment
Physical and chemical properties of diatomite-based composite filler were determined:
Bulk density refers to the weight of filler per unit volume, and is determined by weighing several volumes of filler in a certain container, measuring the total weight m1 of the filler using an analytical balance, subtracting the weight m2 of the container to obtain the total weight m0 of the filler, and then measuring the total volume v0 of the filler, wherein the bulk density of the filler is ρ0=m0/v 0.
The bulk density of the diatomite-based composite filler was 464.56kg/m 3, respectively.
Description of the preferred embodiments
The embodiments are as follows:
Measured by an electronic moisture meter. The sample was immersed in deionized water for 1 hour, and the water loss rate per minute of the sample at 80 ℃ was measured using an electronic moisture analyzer. The water holding performance of the sample is characterized by the method.
And respectively measuring the water loss rate of the diatomite-based composite filler, the diatomite and the ceramsite along with time. From fig. 1, it can be seen that the slope of the curve of the diatomite-based composite filler is smaller than that of the diatomite and the ceramsite when the moisture is sufficient, and the constant weight is achieved for a longer time, wherein the moisture contents of the diatomite-based composite filler, the diatomite and the ceramsite are 75%,32% and 7%, respectively, which indicates that the diatomite-based composite filler has good water holding performance.
Fourth embodiment
The embodiments are as follows:
And loading the diatomite-based composite filler into a biological trickling filtration tower for operation.
The biotrickling filter normally operates 290d, the diatomite-based composite filler is not deformed and damaged during the whole operation period, and the pressure loss of the biotrickling filter is kept at a low level, so that the biotrickling filter is not blocked. Compared with the prior art, feng Ke and the like which are prepared by sodium alginate
The composite packing was run for 60d. Nie Yang and the like which are made of polypropylene fiber as a framework and polyvinyl alcohol and sodium alginate as immobilized materials, 120d.
The diatomite-based composite filler is shown to be operated in the biological trickling filtration tower, has a longer service cycle, and can reduce the operation cost. The invention has obvious advantages.
Description of the preferred embodiment
The embodiments are as follows:
And loading the diatomite-based composite filler into a biological trickling filtration tower for operation.
Under the condition that the inlet concentration is 1200mg/m 3 and the gas residence time is 53s, when the biotrickling filter is operated for 11d, the outlet concentration is lower than the discharge limit value (ρ (xylene) =70mg.m -3) specified in GB 16297-1996, and the biotrickling filter is started successfully.
Description of the preferred embodiment six
The embodiments are as follows:
diatomite-based packing is loaded into a biotrickling filter for operation.
As shown in fig. 2, when the intake load of the biotrickling filter is suddenly increased and maintained for a period of time, the removal efficiency is reduced to a certain extent, and when the intake load is adjusted to the original level, the biotrickling filter can be restored to the removal efficiency before impact within 1 h.
Embodiment seven
The embodiments are as follows:
And loading the diatomite-based composite filler into a biological trickling filtration tower for operation.
The biotrickling filter tower in FIG. 3 can recover to the original purifying capacity in 1d and 9.5h after short-term stopping delay of 7d and 2d respectively.
As shown in FIG. 4, after 81d of stopping delay, the removal efficiency can reach more than 99% after the xylene gas is introduced for 2 d.
Description of the preferred embodiment eight
The embodiments are as follows:
diatomite-based packing is loaded into a biotrickling filter for operation.
When the reactor runs for 124d, the nutrient solution is changed into deionized water for spraying, and the other process parameters are unchanged. Compared with the data obtained when the nutrient solution is sprayed in the earlier stage. As can be seen from FIG. 5, the removal efficiency of the reactor was stabilized at 99% or more in the 110 th to 123 th days. The 124 th to 132d are changed to be sprayed by deionized water, so that the removal efficiency is basically not affected, and the result shows that the composite filler has good nutrition slow release performance.
Description of the preferred embodiments
The filler reusability is achieved by the following embodiments:
The 10mL diatomite-based composite filler is placed in a shaking flask with the volume of 300mL, added into 100mL of nutrient solution, simultaneously injected with 5 mu L of xylene liquid, placed in a constant temperature culture shaker for culturing for 11h at the temperature of 30 ℃ and the temperature of 120 r.min -1, taken out, and the concentration of the xylene in the shaking flask is measured. And taking out the composite filler, sucking the surface moisture of the filler by using filter paper, repeating the steps to perform experiments, respectively measuring the residual concentration of the xylene under different repeated use times, comparing the residual concentration with the initial concentration to obtain corresponding removal efficiency, and examining the repeated use performance of the filler. Each set of experiments was set up with 3 replicates. The nutrient solution comprises K2HPO40.5g·L-1,KH2PO4 1.0g·L-1,MgSO4 0.5g·L-1,NaCl 1.0g·L-1,NH4Cl 1.0g·L-1,FeSO4 0.01g·L-1,CaCl2 0.01g·L-1,MnSO4 0.003g·L-1,H3BO3 0.003g·L-1, water as solvent.
The results are shown in FIG. 6. The diatomite-based composite filler continuously degrades 8 batches of xylene waste gas, and the phenomena of crushing, microbial dissolution and the like of the diatomite-based composite filler do not occur, so that the diatomite-based composite filler has good reusability when being used for treating the xylene waste gas. And the removal efficiency reaches 95% with the increase of the repetition times.
Claims (1)
1. Diatomite-based composite filler for degrading VOCs (volatile organic compounds) in biological trickling filtration tower;
The diatomite-based composite filler is characterized by comprising the following raw materials in percentage by mass: 42-48 parts of diatomite, 33-39 parts of polyvinyl alcohol, 6-12 parts of sodium alginate, 1-7 parts of calcium carbonate, 1-7 parts of xylene degrading bacteria and 1-3 parts of organic fertilizer;
The preparation method comprises the following steps:
(1) Adding polyvinyl alcohol and sodium alginate into deionized water at the rotating speed of 800r/min, and stirring and dissolving in a water bath at 90 ℃;
(2) Cooling the solution to 30 ℃, respectively adding diatomite, calcium carbonate, organic fertilizer and xylene degrading bacteria into the solution, and uniformly stirring to obtain a diatomite-based composite filler mixed solution;
(3) Dripping the obtained diatomite-based composite filler mixed solution into a crosslinking solution, wherein the crosslinking solution is a saturated boric acid solution containing 2% CaCl 2 by mass concentration, and the solvent is water; the volume ratio of deionized water to crosslinking solution in the diatomite-based composite filler mixed solution is 1:10;
(4) Crosslinking for 6-10h at 4 ℃;
(5) Taking out the completely fixed diatomite-based composite filler, and washing with deionized water for 3 times;
The particle size of the diatomite is 200 meshes;
The volume ratio of the diatomite to the deionized water in the diatomite-based composite filler mixed solution is 0.15g:1ml;
the xylene degrading bacteria include Pseudomonas, sphingomonas, burkholderia, rhodococcus, acinetobacter, aeromonas, bdellovibrio, duchesnea, mycobacterium, thiosotus oxide and Thermomonas, and the weight ratio of these 11 bacteria is 19.0:9.1:10.4:1.3:2.7:4.6:3.2:3.3:1.8:1.6:3.7;
The organic fertilizer is sheep manure organic fertilizer, the execution standard is NY/T525-2021, and the mass ratio of nitrogen, phosphorus and potassium to organic matters in the components is 1:9, a step of performing the process;
the cross-linking time of the diatomite-based composite filler is 8 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190247A (en) * | 2014-08-11 | 2014-12-10 | 上海梅思泰克环境设备有限公司 | Biotrickling filter filler and method for preparing biotrickling filter and removing waste gas using biotrickling filter filler |
| CN107158929A (en) * | 2017-06-12 | 2017-09-15 | 广东省微生物研究所（广东省微生物分析检测中心） | A kind of modified polyurethane biologic packing material and its method of modifying and the application in purifying VOCs |
| CN112226431A (en) * | 2020-12-14 | 2021-01-15 | 湖南速博生物技术有限公司 | Preparation method of composite filler loaded with functional microorganisms |
| CN112892201A (en) * | 2021-01-22 | 2021-06-04 | 广州市绿之环生物净化科技有限公司 | System and method for treating organic waste gas by biological method |
| DE102021112734A1 (en) * | 2020-05-19 | 2021-11-25 | China construction first group corporation limited | Biological deodorizing filler and trickling filter tower for removing the malodorous odor of landfill leachate using the same |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190247A (en) * | 2014-08-11 | 2014-12-10 | 上海梅思泰克环境设备有限公司 | Biotrickling filter filler and method for preparing biotrickling filter and removing waste gas using biotrickling filter filler |
| CN107158929A (en) * | 2017-06-12 | 2017-09-15 | 广东省微生物研究所（广东省微生物分析检测中心） | A kind of modified polyurethane biologic packing material and its method of modifying and the application in purifying VOCs |
| DE102021112734A1 (en) * | 2020-05-19 | 2021-11-25 | China construction first group corporation limited | Biological deodorizing filler and trickling filter tower for removing the malodorous odor of landfill leachate using the same |
| CN112226431A (en) * | 2020-12-14 | 2021-01-15 | 湖南速博生物技术有限公司 | Preparation method of composite filler loaded with functional microorganisms |
| CN112892201A (en) * | 2021-01-22 | 2021-06-04 | 广州市绿之环生物净化科技有限公司 | System and method for treating organic waste gas by biological method |
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