CN108911013B - Method for treating glutamic acid fermentation wastewater - Google Patents
Method for treating glutamic acid fermentation wastewater Download PDFInfo
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- CN108911013B CN108911013B CN201810942677.5A CN201810942677A CN108911013B CN 108911013 B CN108911013 B CN 108911013B CN 201810942677 A CN201810942677 A CN 201810942677A CN 108911013 B CN108911013 B CN 108911013B
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- 238000000855 fermentation Methods 0.000 title claims abstract description 38
- 230000004151 fermentation Effects 0.000 title claims abstract description 38
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 235000013922 glutamic acid Nutrition 0.000 title claims abstract description 35
- 239000004220 glutamic acid Substances 0.000 title claims abstract description 35
- 239000002351 wastewater Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000010902 straw Substances 0.000 claims abstract description 44
- 239000000126 substance Substances 0.000 claims abstract description 30
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 16
- FALRKNHUBBKYCC-UHFFFAOYSA-N 2-(chloromethyl)pyridine-3-carbonitrile Chemical compound ClCC1=NC=CC=C1C#N FALRKNHUBBKYCC-UHFFFAOYSA-N 0.000 claims abstract description 8
- 241000209140 Triticum Species 0.000 claims abstract description 8
- 235000021307 Triticum Nutrition 0.000 claims abstract description 8
- 240000008042 Zea mays Species 0.000 claims abstract description 8
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims abstract description 8
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims abstract description 8
- 235000005822 corn Nutrition 0.000 claims abstract description 8
- 238000004880 explosion Methods 0.000 claims abstract description 8
- 229960002089 ferrous chloride Drugs 0.000 claims abstract description 8
- 239000003337 fertilizer Substances 0.000 claims abstract description 8
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims abstract description 8
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical group Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 8
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims abstract description 8
- 229940014800 succinic anhydride Drugs 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims description 47
- 239000000706 filtrate Substances 0.000 claims description 36
- 238000001914 filtration Methods 0.000 claims description 36
- 239000000203 mixture Substances 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 22
- 239000011259 mixed solution Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 12
- 239000000047 product Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 7
- 239000000920 calcium hydroxide Substances 0.000 claims description 7
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 7
- 229920002401 polyacrylamide Polymers 0.000 claims description 7
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 6
- 238000005422 blasting Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 230000000249 desinfective effect Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 238000001694 spray drying Methods 0.000 claims description 6
- 230000001954 sterilising effect Effects 0.000 claims description 6
- 235000019354 vermiculite Nutrition 0.000 claims description 6
- 239000010455 vermiculite Substances 0.000 claims description 6
- 229910052902 vermiculite Inorganic materials 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 14
- 239000006249 magnetic particle Substances 0.000 abstract description 8
- 238000006555 catalytic reaction Methods 0.000 abstract description 6
- 238000004065 wastewater treatment Methods 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 abstract description 4
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 239000001913 cellulose Substances 0.000 abstract description 2
- 229920002678 cellulose Polymers 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- LPUQAYUQRXPFSQ-DFWYDOINSA-M monosodium L-glutamate Chemical compound [Na+].[O-]C(=O)[C@@H](N)CCC(O)=O LPUQAYUQRXPFSQ-DFWYDOINSA-M 0.000 description 5
- 235000013923 monosodium glutamate Nutrition 0.000 description 5
- 239000004223 monosodium glutamate Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000010170 biological method Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- -1 aluminum ions Chemical class 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fertilizers (AREA)
Abstract
The invention relates to a method for treating glutamic acid fermentation wastewater, and belongs to the technical field of wastewater treatment. The invention takes wheat straws and corn straws as base materials, the pores in the straws are enlarged by using a steam explosion technology through hydrogen peroxide oxidation, substances in the straws are subjected to micro degradation, active groups are increased, then ferrous chloride and ferric chloride form nano magnetic particles under an alkaline condition, the active groups are deposited on the straws, the catalysis and adsorption effects are increased, cellulose on the straws is modified by succinic anhydride through the catalysis effect of the magnetic particles, carboxyl groups are increased, the carboxyl groups are combined with glutamic acid through the catalysis effect of the magnetic particles, and impurities in the straws are reduced through the adsorption effect of the magnetic particles, so that the obtained substances can be used as amino acid-like fertilizers.
Description
Technical Field
The invention relates to a method for treating glutamic acid fermentation wastewater, and belongs to the technical field of wastewater treatment.
Background
The wastewater discharged in the production process of the monosodium glutamate is large, and the mother liquor discharged after the monosodium glutamate fermentation liquor is subjected to isoelectric extraction to obtain glutamic acid has the characteristics of high CODCr, high BOD5, high thallus content, high sulfate radical (chloride ion before the pH is adjusted by using sulfuric acid), high ammonia nitrogen content, low pH value (1.5-3.2) and 'five high one low'. Is industrial waste water with great treatment difficulty. On one hand: the extraction of monosodium glutamate usually adopts an isoelectric-ion exchange method, glutamic acid is crystallized by adding concentrated sulfuric acid to adjust isoelectric points, and ammonium sulfate waste liquor generated in the production process brings great difficulty to waste liquor treatment and causes direct harm to the environment and water sources. On the other hand: the monosodium glutamate industry is also the largest pollution source in the fermentation industry of China, and the high-concentration organic wastewater in the monosodium glutamate industry is seriously polluted and is an outstanding common problem in the industry.
Most of the prior methods for treating glutamic acid fermentation wastewater are a flocculation precipitation method and a biological method, but the flocculation effect of a flocculating agent in the flocculation precipitation method is poor, the COD value of effluent treated by the biological method is higher, the hydraulic retention time is longer, and the problem of stink is caused.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problem of poor treatment effect of the glutamic acid fermentation wastewater at present, the invention provides a treatment method of glutamic acid fermentation wastewater.
In order to solve the technical problems, the invention adopts the following technical scheme:
a treatment method of glutamic acid fermentation wastewater comprises the following steps:
(1) mixing glutamic acid fermentation wastewater and pretreated straws according to the mass ratio of 7-9: 1, standing, filtering, collecting filter residues and filtrate, carrying out sealed fermentation on the filter residues, collecting fermented products, carrying out spray drying, and collecting dried products;
(2) filtering the filtrate through the mixture, collecting the filtrate, mixing the filtrate and aluminum ash according to the mass ratio of 5-7: 1, stirring and mixing, adjusting the pH value to 3.5-4.5, and standing;
(3) and after the standing is finished, adding the mixed solution, wherein the adding amount is 20-25% of the volume of the filtrate, heating to 100-105 ℃, heating, standing, filtering, sterilizing and disinfecting the filtrate, standing at 10-15 ℃, filtering, and discharging to finish the treatment of the glutamic acid fermentation wastewater.
The preparation method of the pretreated straw comprises the following steps:
A. mixing and crushing corn straws and wheat straws in a mass ratio of 4: 3-6, sieving, soaking sieved particles and hydrogen peroxide in a mass ratio of 1: 4-7, filtering, performing steam explosion on filter residues, and collecting exploded substances;
B. uniformly mixing the blasting substance, the mixture and water according to a mass ratio of 7-9: 1: 16-20, adjusting the pH to 8.0-8.5 by using ammonia water, standing, filtering, drying, putting the dried substance, absolute ethyl alcohol and succinic anhydride into a reactor according to a mass ratio of 6-9: 20: 2-4, heating, cooling, cold drying, and collecting freeze-dried substances to obtain the pretreated straw.
And the mixture in the step B is formed by mixing ferric chloride and ferrous chloride according to the mass ratio of 4-6: 5.
The dried substance in the step (1) is used for the amino acid-like fertilizer.
The mixture in the step (2) is formed by mixing cobblestones, vermiculite and quartz sand according to the mass ratio of 4:2: 3-6.
And (3) preparing the mixed solution in the step (3) by uniformly stirring and mixing water, calcium hydroxide and polyacrylamide according to the mass ratio of 10: 3-5: 1 to obtain the mixed solution.
Compared with other methods, the method has the beneficial technical effects that:
(1) the invention takes wheat straws and corn straws as base materials, the pores in the straws are enlarged by using a steam explosion technology through hydrogen peroxide oxidation, substances in the straws are subjected to micro degradation, active groups are increased, then ferrous chloride and ferric chloride form nano magnetic particles under an alkaline condition, the active groups are deposited on the straws, the catalysis and adsorption effects are increased, cellulose on the straws is modified by succinic anhydride through the catalysis effect of the magnetic particles, carboxyl groups are increased, the carboxyl groups are combined with glutamic acid through the catalysis effect of the magnetic particles, and impurities in the straws are reduced through the adsorption effect of the magnetic particles, so that the obtained substances can be used as amino acid-like fertilizers;
(2) according to the invention, aluminum ash is added, aluminum ions are formed under the action of strong acid in glutamic acid wastewater, and the polymerization is carried out under the action of high temperature due to the high sulfate radical content in the wastewater to form polymeric aluminum sulfate polymers, so that the wastewater is flocculated and impurity removed, the sulfate radical content in the wastewater is reduced, the effect of treating the wastewater with waste is realized, and the water can be better purified and adsorbed by matching with a mixture, so that the self-purification capacity of water quality is improved;
(3) according to the invention, calcium hydroxide and polyacrylamide are used for further removing impurities in water, so that the treatment effect is improved, and the impurities are reduced.
Detailed Description
The preparation method of the pretreated straw comprises the following steps:
A. mixing and crushing corn straws and wheat straws in a mass ratio of 4: 3-6, sieving with a 100-mesh sieve, soaking sieved particles and hydrogen peroxide in a mass ratio of 1: 4-7 for 1 hour, filtering, performing steam explosion on filter residues under the pressure of 2.5MPa for 10s, and collecting exploded substances;
B. uniformly mixing the blasting substance, the mixture and water according to a mass ratio of 7-9: 1: 16-20, adjusting the pH to 8.0-8.5 by using ammonia water, standing for 2h, filtering, drying, putting the dried substance, absolute ethyl alcohol and succinic anhydride into a reactor according to a mass ratio of 6-9: 20: 2-4, heating to 70 ℃, heating for 2h, cooling, drying, and collecting freeze-dried substances to obtain the pretreated straw.
And the mixture in the step B is formed by mixing ferric chloride and ferrous chloride according to the mass ratio of 4-6: 5.
The dried substance in the step (1) is used for the amino acid-like fertilizer.
The mixture in the step (2) is formed by mixing cobblestones, vermiculite and quartz sand according to the mass ratio of 4:2: 3-6.
And (3) preparing the mixed solution in the step (3) by uniformly stirring and mixing water, calcium hydroxide and polyacrylamide according to the mass ratio of 10: 3-5: 1 to obtain the mixed solution.
A treatment method of glutamic acid fermentation wastewater comprises the following steps:
(1) mixing glutamic acid fermentation wastewater and pretreated straws according to a mass ratio of 7-9: 1, standing for 3 hours, filtering, collecting filter residues and filtrate, carrying out sealed fermentation on the filter residues at a set temperature of 38 ℃, fermenting for 3 days, collecting fermented products, carrying out spray drying, and collecting dried products;
(2) filtering the filtrate through the mixture, collecting the filtrate, stirring and mixing the filtrate and aluminum ash according to the mass ratio of 5-7: 1, adjusting the pH value to 3.5-4.5, and standing for 6 hours;
(3) and after the standing is finished, adding the mixed solution, wherein the adding amount is 20-25% of the volume of the filtrate, heating to 100-105 ℃, heating for 2 hours, standing for 5 hours, filtering, sterilizing and disinfecting the filtrate, standing for 3 hours at 10-15 ℃, filtering, and discharging to finish the treatment of the glutamic acid fermentation wastewater.
The preparation method of the pretreated straw comprises the following steps:
A. mixing and crushing corn straws and wheat straws in a mass ratio of 4:6, sieving with a 100-mesh sieve, soaking sieved particles and hydrogen peroxide in a mass ratio of 1:7 for 1h, filtering, performing steam explosion on filter residues under the pressure of 2.5MPa for 10s, and collecting exploded materials;
B. uniformly mixing the blasting substance, the mixture and water according to the mass ratio of 9:1:20, adjusting the pH to 8.5 by using ammonia water, standing for 2h, filtering, drying, putting the dried substance, absolute ethyl alcohol and succinic anhydride into a reactor according to the mass ratio of 9:20:4, heating to 70 ℃, heating for 2h, cooling, drying, and collecting freeze-dried substances to obtain the pretreated straw.
And the mixture in the step B is formed by mixing ferric chloride and ferrous chloride according to the mass ratio of 6: 5.
The dried substance in the step (1) is used for the amino acid-like fertilizer.
The mixture in the step (2) is prepared by mixing cobblestones, vermiculite and quartz sand according to the mass ratio of 4:2: 6.
And (3) preparing the mixed solution in the step (3) by uniformly stirring and mixing water, calcium hydroxide and polyacrylamide according to the mass ratio of 10:5:1 to obtain the mixed solution.
A treatment method of glutamic acid fermentation wastewater comprises the following steps:
(1) mixing glutamic acid fermentation wastewater and pretreated straws according to a mass ratio of 9:1, standing for 3h, filtering, collecting filter residue and filtrate, performing sealed fermentation on the filter residue at a set temperature of 38 ℃, fermenting for 3 days, collecting fermented products, performing spray drying, and collecting dried products;
(2) filtering the filtrate through the mixture, collecting the filtrate, mixing the filtrate and aluminum ash according to the mass ratio of 7:1, stirring and mixing, adjusting the pH value to 4.5, and standing for 6 hours;
(3) and after the standing is finished, adding the mixed solution, wherein the adding amount is 25% of the volume of the filtrate, heating to 105 ℃, heating for 2 hours, standing for 5 hours, filtering, sterilizing and disinfecting the filtrate, standing for 3 hours at 15 ℃, filtering, and discharging to finish the treatment of the glutamic acid fermentation wastewater.
The preparation method of the pretreated straw comprises the following steps:
A. mixing and crushing corn straws and wheat straws in a mass ratio of 4:5, sieving with a 100-mesh sieve, soaking sieved particles and hydrogen peroxide in a mass ratio of 1:6 for 1h, filtering, performing steam explosion on filter residues under the pressure of 2.5MPa for 10s, and collecting exploded materials;
B. uniformly mixing the blasting substance, the mixture and water according to a mass ratio of 8:1:19, adjusting the pH to 8.5 by using ammonia water, standing for 2h, filtering, drying, putting the dried substance, absolute ethyl alcohol and succinic anhydride into a reactor according to a mass ratio of 8:20:3, heating to 70 ℃, heating for 2h, cooling, drying, and collecting freeze-dried substances to obtain the pretreated straw.
And the mixture in the step B is formed by mixing ferric chloride and ferrous chloride according to the mass ratio of 5: 5.
The dried substance in the step (1) is used for the amino acid-like fertilizer.
The mixture in the step (2) is prepared by mixing cobblestones, vermiculite and quartz sand according to the mass ratio of 4:2: 5.
And (3) preparing the mixed solution in the step (3) by uniformly stirring and mixing water, calcium hydroxide and polyacrylamide according to the mass ratio of 10:4:1 to obtain the mixed solution.
A treatment method of glutamic acid fermentation wastewater comprises the following steps:
(1) mixing glutamic acid fermentation wastewater and pretreated straws according to a mass ratio of 8:1, standing for 3h, filtering, collecting filter residue and filtrate, performing sealed fermentation on the filter residue at a set temperature of 38 ℃, fermenting for 3 days, collecting fermented products, performing spray drying, and collecting dried products;
(2) filtering the filtrate through the mixture, collecting the filtrate, mixing the filtrate and aluminum ash according to the mass ratio of 6:1, stirring and mixing, adjusting the pH value to 4.0, and standing for 6 hours;
(3) and after the standing is finished, adding the mixed solution, wherein the adding amount is 23% of the volume of the filtrate, heating to 103 ℃, heating for 2 hours, standing for 5 hours, filtering, sterilizing and disinfecting the filtrate, standing for 3 hours at 13 ℃, filtering, and discharging to finish the treatment of the glutamic acid fermentation wastewater.
The preparation method of the pretreated straw comprises the following steps:
A. mixing and crushing corn straws and wheat straws in a mass ratio of 4:3, sieving with a 100-mesh sieve, soaking sieved particles and hydrogen peroxide in a mass ratio of 1:4 for 1h, filtering, performing steam explosion on filter residues under the pressure of 2.5MPa for 10s, and collecting exploded materials;
B. uniformly mixing the blasting substance, the mixture and water according to the mass ratio of 7:1:16, adjusting the pH to 8.0 by using ammonia water, standing for 2h, filtering, drying, putting the dried substance, absolute ethyl alcohol and succinic anhydride into a reactor according to the mass ratio of 6:20:2, heating to 70 ℃, heating for 2h, cooling, drying, and collecting freeze-dried substances to obtain the pretreated straw.
And the mixture in the step B is formed by mixing ferric chloride and ferrous chloride according to the mass ratio of 4: 5.
The dried substance in the step (1) is used for the amino acid-like fertilizer.
The mixture in the step (2) is prepared by mixing cobblestones, vermiculite and quartz sand according to the mass ratio of 4:2: 3.
And (3) preparing the mixed solution in the step (3) by uniformly stirring and mixing water, calcium hydroxide and polyacrylamide according to the mass ratio of 10:3:1 to obtain the mixed solution.
A treatment method of glutamic acid fermentation wastewater comprises the following steps:
(1) mixing glutamic acid fermentation wastewater and pretreated straws according to a mass ratio of 7:1, standing for 3h, filtering, collecting filter residue and filtrate, performing sealed fermentation on the filter residue at a set temperature of 38 ℃, fermenting for 3 days, collecting fermented product, performing spray drying, and collecting dried product;
(2) filtering the filtrate through the mixture, collecting the filtrate, mixing the filtrate and aluminum ash according to the mass ratio of 5:1, stirring and mixing, adjusting the pH value to 3.5, and standing for 6 hours;
(3) and after the standing is finished, adding the mixed solution, wherein the adding amount is 20% of the volume of the filtrate, heating to 100-105 ℃, heating for 2 hours, standing for 5 hours, filtering, sterilizing and disinfecting the filtrate, standing for 3 hours at 10 ℃, filtering, and discharging to finish the treatment of the glutamic acid fermentation wastewater.
Comparative example: a glutamic acid fermentation wastewater treatment method provided by a certain company in Qingdao city.
Respectively taking 1L of wastewater, and simultaneously monitoring the ph of the solution to 8, testing by using the glutamic acid fermentation wastewater treatment method of the embodiment 1-3 and the glutamic acid fermentation wastewater treatment method of the comparative example, wherein the test method adopts GB 8978 + 1996 standard, and the test results are shown in Table 1.
Table 1:
| test items | Example 1 | Example 2 | Example 3 | Comparative example |
| COD （mg/L） | 486 | 510 | 502 | 1098 |
| Average ammonia nitrogen removal rate (%) | 99.7 | 99.1 | 98.3 | 79.6 |
| BOD5（mg/L） | 7 | 9 | 8 | 15 |
In conclusion, the glutamic acid fermentation wastewater treatment method disclosed by the invention has a better effect in practical use and is worthy of being widely popularized and used.
Claims (2)
1. A treatment method of glutamic acid fermentation wastewater is characterized by comprising the following steps:
(1) mixing glutamic acid fermentation wastewater and pretreated straws according to the mass ratio of 7-9: 1, standing, filtering, collecting filter residues and filtrate, carrying out sealed fermentation on the filter residues, collecting fermented products, carrying out spray drying, and collecting dried products;
the preparation method of the pretreated straw comprises the following steps:
A. mixing and crushing corn straws and wheat straws in a mass ratio of 4: 3-6, sieving, soaking sieved particles and hydrogen peroxide in a mass ratio of 1: 4-7, filtering, performing steam explosion on filter residues, and collecting exploded substances;
B. uniformly mixing the blasting substance, the mixture and water according to a mass ratio of 7-9: 1: 16-20, adjusting the pH to 8.0-8.5 by using ammonia water, standing, filtering, drying, putting the dried substance, absolute ethyl alcohol and succinic anhydride into a reactor according to a mass ratio of 6-9: 20: 2-4, heating, cooling, drying, and collecting freeze-dried substances to obtain pretreated straws; the mixture is formed by mixing ferric chloride and ferrous chloride according to a mass ratio of 4-6: 5;
(2) filtering the filtrate through the mixture, collecting the filtrate, mixing the filtrate and aluminum ash according to the mass ratio of 5-7: 1, stirring and mixing, adjusting the pH value to 3.5-4.5, and standing; the mixture is formed by mixing cobblestones, vermiculite and quartz sand according to the mass ratio of 4:2: 3-6;
(3) after the standing is finished, adding the mixed solution, wherein the adding amount is 20-25% of the volume of the filtrate, heating to 100-105 ℃, heating, standing, filtering, sterilizing and disinfecting the filtrate, standing at 10-15 ℃, filtering, and discharging to finish the treatment of the glutamic acid fermentation wastewater; the mixed solution is prepared by uniformly stirring and mixing water, calcium hydroxide and polyacrylamide according to the mass ratio of 10: 3-5: 1 to obtain the mixed solution.
2. The method for treating glutamic acid fermentation wastewater according to claim 1, wherein the dried matter in the step (1) is used for an amino acid-like fertilizer.
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Denomination of invention: A treatment method for glutamic acid fermentation wastewater Granted publication date: 20210119 Pledgee: Yiwu Branch of China Construction Bank Co.,Ltd. Pledgor: Zhejiang Mifeng Group Co.,Ltd. Registration number: Y2024330001024 |