CN117209055A - Method for strengthening methane fermentation of high-salt kitchen wastewater - Google Patents
Method for strengthening methane fermentation of high-salt kitchen wastewater Download PDFInfo
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- CN117209055A CN117209055A CN202311166990.1A CN202311166990A CN117209055A CN 117209055 A CN117209055 A CN 117209055A CN 202311166990 A CN202311166990 A CN 202311166990A CN 117209055 A CN117209055 A CN 117209055A
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- salinity
- fermentation system
- anaerobic fermentation
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- 238000000855 fermentation Methods 0.000 title claims abstract description 67
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000002351 wastewater Substances 0.000 title claims abstract description 32
- 230000004151 fermentation Effects 0.000 title claims abstract description 21
- 238000005728 strengthening Methods 0.000 title claims abstract description 13
- 239000002131 composite material Substances 0.000 claims abstract description 26
- 239000010802 sludge Substances 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 230000009467 reduction Effects 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000002023 wood Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims 3
- 238000005273 aeration Methods 0.000 claims 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 32
- 150000003839 salts Chemical class 0.000 description 16
- 239000011780 sodium chloride Substances 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 13
- 239000012528 membrane Substances 0.000 description 8
- 230000001186 cumulative effect Effects 0.000 description 7
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- 238000005516 engineering process Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
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- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 244000005700 microbiome Species 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 239000003456 ion exchange resin Substances 0.000 description 3
- 229920003303 ion-exchange polymer Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 150000001450 anions Chemical class 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000006911 enzymatic reaction Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000000696 methanogenic effect Effects 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- 241000203069 Archaea Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 235000013355 food flavoring agent Nutrition 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000010806 kitchen waste Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002503 metabolic effect Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000020477 pH reduction Effects 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for strengthening methane fermentation of high-salinity kitchen wastewater, which comprises the following steps: obtaining composite biochar and anaerobic seed mud; adding the composite biochar and anaerobic seed sludge into an anaerobic fermentation system; and adding kitchen wastewater into the anaerobic fermentation system, aerating the interior of the anaerobic fermentation system, and sealing to ensure the anaerobic environment required by the operation of the anaerobic fermentation system, and then fermenting to produce methane.
Description
Technical Field
The invention belongs to the technical field of environmental waste recycling treatment, and relates to a method for strengthening methane fermentation of high-salinity kitchen wastewater.
Background
Edible salt is a food flavoring agent commonly used by people in the cooking process, and the main component of the edible salt is NaCl. The edible salt is inevitably remained in the kitchen waste due to the use of the edible salt in the cooking process. Anaerobic fermentation (AD) is becoming an emerging sustainable green technology, with increasing attention in environmental friendly waste management and renewable energy production. However, anaerobic fermentation methanogenesis is often affected by salt concentration, which can maintain microbial membrane balance and regulate osmotic pressure under low NaCl concentration conditions, promote enzyme reaction activity, and improve hydrolysis and acidification processes. When the NaCl concentration exceeds a certain threshold value, the osmotic pressure of the anaerobic fermentation system is increased, so that the enzyme reaction activity in the growth process of microorganisms is reduced, the metabolic activity of methanogenic archaea is inhibited, and the methanogenic efficiency is reduced. Therefore, in practical engineering application, how to relieve the inhibition of salt on anaerobic fermentation of kitchen wastewater has important significance.
The method for relieving the influence of salt in an anaerobic fermentation system mainly comprises a physical treatment method and a biological treatment method, wherein the physical treatment method comprises a membrane separation technology, an ion exchange technology and the like, and the biological treatment method mainly comprises a microorganism domestication technology and a co-digestion technology. (1) The membrane separation technology is to separate solute from solvent in the mixture by means of selective osmosis of the membrane under the pushing of external input energy or chemical potential difference. However, high concentration organic matters in the kitchen wastewater can block membrane holes to cause membrane pollution, and the membrane method cannot completely separate salt and water, but only concentrate the salt, so that concentrated water with higher salt concentration can be produced while fresh water is produced. Therefore, the application of the membrane method in the treatment of the high-concentration organic wastewater containing salt is greatly limited. (2) The ion exchange method is a method for removing target ions in water by utilizing anions and cations in kitchen wastewater to replace anions and cations in an exchanger. However, ion exchange resins have limited exchange capacity and saturated ion exchange resins require regeneration operations to continue their use. The regeneration operation of the ion exchange resin needs to adopt high-concentration acid, alkali or sodium chloride, and the regenerated wastewater is also a new pollutant, so that the ion exchange method for treating the high-concentration organic wastewater containing salt has great limitation. (3) Aiming at the biological treatment of organic matters under the salt-containing condition, how to solve the problems of lower organic matter removal efficiency caused by the inhibition or poisoning of salt to microorganisms, loss of microorganisms in a reaction system and the like, the treatment efficiency of the high-concentration organic wastewater containing salt is improved, and the method still needs to be explored and researched.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for strengthening methane fermentation of high-salinity kitchen wastewater, which can improve the fermentation treatment efficiency of the high-salinity kitchen wastewater.
In order to achieve the aim, the invention discloses a method for strengthening methane fermentation of high-salinity kitchen wastewater, which comprises the following steps:
obtaining composite biochar and anaerobic seed mud;
adding the composite biochar and anaerobic seed sludge into an anaerobic fermentation system;
and adding kitchen wastewater into the anaerobic fermentation system, aerating the inside of the anaerobic fermentation system, sealing to ensure the anaerobic environment required by the operation of the anaerobic fermentation system, and then fermenting.
The biochar is composite biochar prepared from wood chips and iron-containing sludge, and the iron-containing sludge is industrial red mud, waste iron mud or Fenton treatment sludge.
The preparation process of the composite biochar comprises the following steps:
the wood chips and the iron-containing sludge after the drying treatment are mixed according to the mass ratio of 1: and (2-4) after uniformly mixing the components in proportion, putting the mixture into a ceramic crucible, and performing carbothermic reduction in a high-temperature sealing furnace to obtain the composite biochar.
The carbothermic reduction temperature was 900 ℃.
The carbothermic reduction time was 3h.
Grinding the composite biochar, and sieving with a 200-mesh sieve for standby.
And continuously aerating the anaerobic fermentation system for 5min by adopting nitrogen.
Aerating the anaerobic fermentation system, and sealing the anaerobic fermentation system by using a rubber plug and an aluminum cover.
The invention has the following beneficial effects:
according to the method for strengthening methane fermentation of high-salinity kitchen wastewater, disclosed by the invention, when the method is specifically operated, the composite biochar is added into the anaerobic fermentation system, and the inhibition of salinity on the anaerobic fermentation system is effectively relieved through the composite biochar, so that the fermentation treatment efficiency of the high-salinity kitchen wastewater is improved. Through experiments, under the condition of the same NaCl concentration, the composite biochar is added into the kitchen anaerobic fermentation system, so that the maximum specific methane production rate of the system can be improved by 9.8-28.2%, the methane production delay period is shortened by 5.1-53.8%, and the kitchen wastewater anaerobic fermentation salinity inhibition relieving effect is remarkable.
Drawings
FIG. 1a is a graph showing the cumulative methane yield change in an anaerobic fermentation system at 5g/L NaCl;
FIG. 1b is a graph showing the cumulative methane yield change in an anaerobic fermentation system at 10g/L NaCl;
FIG. 1c is a graph showing the cumulative methane yield change in an anaerobic fermentation system at 20g/L NaCl;
FIG. 1d is a graph showing the cumulative methane yield change in an anaerobic fermentation system at 40g/L NaCl;
FIG. 2 is a graph showing the cumulative VFA content of the biochar before and after the biochar is added.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, but not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the accompanying drawings, there is shown a schematic structural diagram in accordance with a disclosed embodiment of the invention. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
Example 1
The invention relates to a method for strengthening methane fermentation of high-salinity kitchen wastewater, which comprises the following steps:
1) Preparing composite biochar;
the composite biochar is prepared from wood dust and iron-containing sludge through a carbothermic reduction method, wherein the iron-containing sludge is industrial red mud, waste iron sludge or Fenton treatment sludge, and specifically, the dried wood dust and iron-containing sludge are subjected to a mass ratio of 1: uniformly mixing the components (2-4), placing the mixture into a ceramic crucible, performing carbothermic reduction in a high-temperature sealed furnace under nitrogen atmosphere, wherein the temperature is 900 ℃, the reduction time is 3 hours, obtaining composite biochar, grinding the composite biochar, and sieving the ground composite biochar with a 200-mesh sieve for later use.
2) Adding the composite biochar and anaerobic seed sludge into an anaerobic fermentation system;
3) And adding kitchen wastewater into the anaerobic fermentation system, continuously aerating the anaerobic fermentation system for 5min by adopting nitrogen, sealing the anaerobic fermentation system to ensure the anaerobic environment required by the operation of the anaerobic fermentation system, and then performing fermentation treatment.
Specifically, the anaerobic fermentation system is continuously aerated by using nitrogen with the purity of 99.9 percent for 5 minutes, and then is immediately sealed by a rubber plug and a cover, so that the sealing state is kept until the operation is finished in the operation process of the anaerobic environment system required by the operation of the anaerobic fermentation system.
Verification experiment one
The experiment was divided into two groups, the first of which was: the NaCl solution group is not added into the anaerobic fermentation system, the second group is three subgroups, and the three subgroups are respectively: and respectively adding 10g/LNaCl, 20g/LNaCl and 40g/L NaCl into the anaerobic fermentation system, wherein the maximum methane production rates of the 10g/LNaCl, 20g/LNaCl and 40g/LNaCl added are respectively reduced by 3.3%, 17.9% and 46.7% and the methane production delay period is increased by 11.4%, 22.9% and 97.1% compared with the maximum methane production rates of the NaCl solution added without adding the NaCl solution.
Verification experiment II
The experiment is divided into two large groups, wherein, the five small groups in the first large group BC are added with composite biochar, the five small groups in the second large group CT are not added with biochar, and the concentration of NaCl solution respectively added in the small five groups in the two large groups is 0g/L, 5g/L, 10g/L, 20g/L and 40g/L.
The gas yield of the anaerobic fermentation system was measured daily and the gas composition was measured by means of a gas chromatograph (thermal conductivity detector), and the cumulative methane yield results for each group are shown in fig. 1a to 1 d.
The VFA concentration in the anaerobic fermentation system was measured periodically as the reaction proceeds by gas chromatography, and the detection results are shown in fig. 2.
It can be seen from fig. 1a to 1d that the cumulative gas production of the CT group and BC group is not significantly different at the same NaCl concentration. However, the delay period of methane production in BC group is smaller than that in CT group, and the maximum specific methane production rate in BC group is larger than that in CT group. From fig. 2, it can be seen that the VFA accumulation amount of the BC group is reduced by 6.2% -21.3% under the same NaCl concentration, which indicates that the addition of the composite biochar can significantly relieve the anaerobic fermentation salinity inhibition of the kitchen wastewater, promote the inter-nutrient methanogenesis efficiency and promote the ecological safety of the fermentation liquor.
In the invention, the wood dust and the biochar of the iron-containing sludge source are taken as the exogenous additive and added into the anaerobic fermentation system of the kitchen wastewater, so that the inhibition of salt on the anaerobic fermentation system can be effectively relieved, the methane production efficiency of the fermentation system is improved, and the invention has the following advantages: a) The inhibition of high salinity on the productivity efficiency of the anaerobic fermentation system can be relieved; b) The delay period of methane production can be effectively shortened, and the maximum specific methane production rate is improved; c) The composite biochar is derived from solid waste, belongs to an environment-friendly material, realizes recycling of the solid waste, and has low cost; d) The application effect is obvious, the cost is low, and the operability is strong.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (8)
1. The method for strengthening methane fermentation of the high-salt kitchen wastewater is characterized by comprising the following steps of:
obtaining composite biochar and anaerobic seed mud;
adding the composite biochar and anaerobic seed sludge into an anaerobic fermentation system;
and adding kitchen wastewater into the anaerobic fermentation system, aerating the inside of the anaerobic fermentation system, sealing to ensure the anaerobic environment required by the operation of the anaerobic fermentation system, and then fermenting.
2. The method for strengthening methane fermentation of high-salinity kitchen wastewater according to claim 1, wherein the composite biochar is prepared from wood chips and iron-containing sludge by a carbothermic reduction method, and the iron-containing sludge is industrial red mud, waste iron mud or Fenton treatment sludge.
3. The method for strengthening methane fermentation of high-salinity kitchen wastewater according to claim 2, wherein the preparation process of the composite biochar is as follows:
the wood chips and the iron-containing sludge after the drying treatment are mixed according to the mass ratio of 1: and (2-4) after uniformly mixing the components in proportion, putting the mixture into a ceramic crucible, and performing carbothermic reduction in a high-temperature sealing furnace to obtain the composite biochar.
4. A method for enhancing methane fermentation of high-salinity kitchen wastewater according to claim 3, wherein carbothermic reduction is performed under nitrogen atmosphere at 900 ℃.
5. A method for enhancing methane fermentation of high-salinity kitchen wastewater according to claim 3, wherein the carbothermic reduction time is 3 hours.
6. The method for enhancing methane fermentation of high-salinity kitchen wastewater according to claim 3, wherein the composite biochar is ground and then screened by a 200-mesh sieve for later use.
7. The method for strengthening methane fermentation of high-salinity kitchen wastewater according to claim 1, wherein the anaerobic fermentation system is continuously aerated for 5min by adopting nitrogen.
8. The method for strengthening methane fermentation of high-salinity kitchen wastewater according to claim 1, wherein aeration is performed inside the anaerobic fermentation system, and then the anaerobic fermentation system is sealed by using a rubber plug and an aluminum cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311166990.1A CN117209055A (en) | 2023-09-11 | 2023-09-11 | Method for strengthening methane fermentation of high-salt kitchen wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311166990.1A CN117209055A (en) | 2023-09-11 | 2023-09-11 | Method for strengthening methane fermentation of high-salt kitchen wastewater |
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| Publication Number | Publication Date |
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| CN117209055A true CN117209055A (en) | 2023-12-12 |
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|---|---|---|---|
| CN202311166990.1A Pending CN117209055A (en) | 2023-09-11 | 2023-09-11 | Method for strengthening methane fermentation of high-salt kitchen wastewater |
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| Country | Link |
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| CN (1) | CN117209055A (en) |
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2023
- 2023-09-11 CN CN202311166990.1A patent/CN117209055A/en active Pending
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