WO2014012418A1 - 一种连续发酵制备高丙酸含量短链脂肪酸的方法 - Google Patents
一种连续发酵制备高丙酸含量短链脂肪酸的方法 Download PDFInfo
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- WO2014012418A1 WO2014012418A1 PCT/CN2013/077825 CN2013077825W WO2014012418A1 WO 2014012418 A1 WO2014012418 A1 WO 2014012418A1 CN 2013077825 W CN2013077825 W CN 2013077825W WO 2014012418 A1 WO2014012418 A1 WO 2014012418A1
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- Prior art keywords
- fermentation
- anaerobic
- sludge
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- acid
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/40—Preparation of oxygen-containing organic compounds containing a carboxyl group including Peroxycarboxylic acids
- C12P7/52—Propionic acid; Butyric acids
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/40—Preparation of oxygen-containing organic compounds containing a carboxyl group including Peroxycarboxylic acids
Definitions
- the invention belongs to the technical field of environmental protection and relates to a preparation method of short-chain fatty acids. Background technique
- the main processes used for the production of microbial products include continuous fermentation and batch fermentation.
- the principle of continuous fermentation of propionic acid is that by continuously adding the culture solution to the fermenter and taking out the fermentation broth, the microorganisms in the fermenter can be maintained at a certain stage of growth while reducing the accumulation of metabolites, concentration and metabolism of the culture solution.
- the product content is relatively stable, and the microorganisms are always maintained in a stable state throughout the fermentation process.
- continuous fermentation has the advantages of stable product yield and quality, short fermentation cycle, high equipment utilization, and easy optimization of the process. Summary of the invention
- the present invention adopts the following technical solutions:
- a method for preparing a short-chain fatty acid comprising the steps of:
- step (3) Centrifuge the discharged mixture, take out part of the centrifuged lower layer of solid matter (other efflux), add water, mix in a suspension oscillator, and then inject it with fresh sludge, kitchen waste and alkali in step (2).
- Anaerobic hydrolysis fermenter Centrifugal supernatant is sterilized in a sterilization oven, cooled to room temperature, adjusted to pH 6-8, and injected into an anaerobic acidogenic fermentation tank;
- a part of the fermentation broth is discharged from the anaerobic acid-producing fermenter at intervals, and the fermented supernatant liquid rich in propionic acid is obtained by centrifugation, and the anaerobic acid-producing fermenter is additionally sterilized.
- the centrifuged supernatant and the Propionibacterium seed culture solution were passed.
- the base is calcium hydroxide (Ca(OH) 2 ).
- sludge is the primary sludge of the municipal sewage plant or the excess sludge of the concentration tank, wherein the total suspended solids (TSS) content is 15-25 g/L, volatile suspended solids/total suspended solids (VS) /TS) is greater than or equal to 0.65 and moisture content is greater than 98.0%.
- TSS total suspended solids
- VS volatile suspended solids/total suspended solids
- the step (1) of the kitchen waste is to remove the waste such as chopsticks, broken bones, plastic, paper, pieces, etc., and then crushed by a pulverizer, and the water having a sieve of 10 mesh has a water content of 65%-90%, TCOD. It is 75 ⁇ 150 g/L.
- the step (1) is that the sludge and the kitchen waste are mixed according to the dry weight mass ratio of 0.3:1 to 0.08:1, preferably 0.18:1; after mixing, the water is diluted with a TCOD of 25-45 g/L.
- the step (1) anaerobic fermentation temperature is 10 ⁇ 65 ° C, preferably 25 ° C
- the amount of alkali added in the step (1) is 0.5 to 1.5%, preferably 1%, of the total dry weight of the sludge and the kitchen waste mixture.
- the interval in the step (2) is 20 ⁇ 28h, preferably 24h.
- the discharge volume of the fermentation mixture in the step (2) is 1/2-1/5 of the volume of the total mixture added to the reactor, preferably
- the volume of the fresh sludge and the kitchen waste mixture in the step (2) is 30 ⁇ 70%, preferably 50%, of the volume of the discharged mixture; the amount of alkali added is the dry weight of the added fresh sludge and the kitchen waste. 1 to 10%, preferably 3%.
- the step (3) has a centrifugal speed of 1500 ⁇ 3500 rpm, preferably 2500 rpm, and the centrifugation time is 2-8 min.
- the step (3) has a sterilization temperature of 121 ° C, a pressure of O.11 OMPa for 10 to 30 min, preferably. 20min.
- the dry weight of the centrifuged lower solid material taken in the step (3) accounts for 30 to 70%, preferably 50%, of the dry weight of the total dehydrated solid matter.
- the solid concentration of the mixture injected into the anaerobic hydrolysis reactor is 20-22 g/L.
- the inoculum amount in the step (4) is 5% to 15%, preferably 10%.
- the interval time in the step (5) is 20 to 28 hours, preferably 24 hours.
- the discharge volume of the fermentation liquid in the step (5) is 1/3 to 1/5, preferably 1/4 of all the liquid in the fermenter.
- the fresh fermentation liquid is added in an amount of 95% to 85%, preferably 90%, of the volume of the discharged fermentation liquid.
- the inoculum amount of Propionibacterium in the step (5) is 5% to 15%, preferably 10%, of the volume of the discharged fermentation broth.
- the fermentation liquid in the step (5) has a centrifugal speed of 500 to 2000 rpm, preferably 100 rpm, and a centrifugation time of l to 5 minutes. It is preferably 3 min.
- the concentration of propionic acid in the fermentation supernatant is 9.5 to 16.8 g COD/L.
- the short chain fatty acids include acetic acid, propionic acid, isobutyric acid, n-butyric acid, isovaleric acid, and n-valeric acid.
- the range of values of short-chain fatty acids is determined by a specific process.
- the acetic acid content in the fermentation supernatant prepared in the step (5) is 2.2-4.8 g COD/L
- the content of propionic acid is in the range of 9.5- 16.8g COD/L
- isobutyric acid is 1.2-2.5 g COD/L.
- the present invention has the following advantages and beneficial effects:
- FIG. 1 is a flow chart showing a process for continuously fermenting a short-chain fatty acid having a high propionic acid content in an embodiment of the present invention. detailed description
- the detection indexes of the fermentation supernatant liquid include the total volume of the filtrate, short-chain fatty acids (SCFAs), VSS, and the like.
- the volatile organic matter in the sludge and kitchen waste mixture can be reduced by 27.8%, and the final fermentation supernatant is propionic acid.
- Anaerobic hydrolysis fermenter (the volume of the mixture in the tank is about 27L), the initial TCOD is 30 gCOD/L, and the addition of Ca(OH) 2 11.8 g (ie the mass of Ca(OH) 2 is 1.5 of the dry weight of the added mixture. %), stirring at room temperature (25 ° C), anaerobic fermentation;
- Anaerobic hydrolysis fermenter initial TCOD of 30 gCOD / L, while adding Ca (OH) 2 3.9 g (ie the mass of Ca (OH) 2 is 0.5% of the dry weight of the added mixture), room temperature (25 ° C) Stirring, anaerobic fermentation;
- the supernatant was injected into the sterilization 8.5L dehydration furnace, at a temperature of 121 ° C, a pressure O.llOMPa sterilization 30min, cooled to room temperature, Ca (OH) 2 the emulsion was adjusted to pH 7, is injected into the anaerobic 40L Acidogenic fermenter;
- Anaerobic hydrolysis fermenter initial TCOD of 30 gCOD / L, while adding Ca (OH) 2 7.8 g (ie the mass of Ca (OH) 2 is 1% of the dry weight of the added mixture), at temperature io °c Stir anaerobic fermentation;
- Anaerobic hydrolysis fermenter initial TCOD of 30 gCOD / L, while adding Ca (OH) 2 7.8 g (ie the mass of Ca (OH) 2 is 1% of the dry weight of the added mixture), at a temperature of 65 ° C Stir and perform anaerobic fermentation.
- the volatile organic matter in the sludge and kitchen waste mixture can be reduced by 24.8%, and the fermentation supernatant contains propionic acid 12.53. gCOD/L (68.3% of total acid).
- the new method utilizes waste resources, and the substrates used in the existing propionic acid production technology are all pure chemical agents, which are relatively expensive.
- the yield is greatly improved, and the propionic acid up to 16.7g COD/L can be obtained and the content is as high as 71%, while the conventional anaerobic alkaline fermentation produces acid.
- the acid content is only 1-3 g COD/L, and the highest content is only 20%.
- Table 1 shows the Propionibacterium enrichment medium in the examples of the present invention.
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- Organic Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Zoology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Microbiology (AREA)
- General Chemical & Material Sciences (AREA)
- Biotechnology (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
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- Treatment Of Sludge (AREA)
Abstract
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/415,384 US20150191754A1 (en) | 2012-07-18 | 2013-06-25 | Method for preparing short-chain fatty acid having high propanoic acid content by continuous fermentation |
Applications Claiming Priority (2)
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CN201210260363.XA CN102796774B (zh) | 2012-07-18 | 2012-07-18 | 一种连续发酵制备高丙酸含量短链脂肪酸的方法 |
CN201210260363.X | 2012-07-18 |
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WO2014012418A1 true WO2014012418A1 (zh) | 2014-01-23 |
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PCT/CN2013/077825 WO2014012418A1 (zh) | 2012-07-18 | 2013-06-25 | 一种连续发酵制备高丙酸含量短链脂肪酸的方法 |
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US (1) | US20150191754A1 (zh) |
CN (1) | CN102796774B (zh) |
WO (1) | WO2014012418A1 (zh) |
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CN113481245A (zh) * | 2021-08-05 | 2021-10-08 | 四川大学 | 一种基于pH调控的污泥生产己酸和庚酸的方法 |
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Cited By (5)
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US10544721B2 (en) | 2017-12-11 | 2020-01-28 | Cummins Emission Solutions Inc. | Reductant delivery systems and methods |
CN112592938A (zh) * | 2020-10-28 | 2021-04-02 | 同济大学 | 一种城镇湿垃圾有机组成转化为含有羧基基团的产物的调控方法 |
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CN113481245A (zh) * | 2021-08-05 | 2021-10-08 | 四川大学 | 一种基于pH调控的污泥生产己酸和庚酸的方法 |
CN113481245B (zh) * | 2021-08-05 | 2023-09-05 | 四川大学 | 一种基于pH调控的污泥生产己酸和庚酸的方法 |
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Publication number | Publication date |
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CN102796774A (zh) | 2012-11-28 |
US20150191754A1 (en) | 2015-07-09 |
CN102796774B (zh) | 2014-09-17 |
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