CN108949835A - A method of it improving stalk height and consolidates anaerobic digestion methane phase - Google Patents
A method of it improving stalk height and consolidates anaerobic digestion methane phase Download PDFInfo
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Abstract
The present invention provides a kind of methods that raising stalk height consolidates anaerobic digestion methane phase, which comprises (1) ensiling stalks is soaked in inoculation liquid, to be pre-mixed to it；Wherein, the solid content of ensiling stalks is 20%-30%；(2) mixture obtained by step (1) is added in garage type anaerobic reactor, so that the mixture carries out anaerobic digestion and generates methane；(3) by the way that biogas slurry is back at the top of garage type anaerobic reactor and is sprayed in reactor to realize mass transfer in anaerobic digestion process.This method provided by the present invention preferably suitably sprays mode to the return-flow system of high solid anaerobic System, mass-transfer efficiency can be effectively improved, reinforce contacting between substrate and microorganism, the growth and enrichment for promoting the microorganism in anaerobic System, improve the efficiency of anaerobic digestion methane phase.And this method has largely saved energy consumption, while greatly reducing the water content in biogas residue, convenient for the processing such as subsequent compost.
Description
Technical field
The present invention relates to a kind of methods that raising stalk height consolidates anaerobic digestion methane phase, belong to solid waste processing control
System, environmental purification processing technology field.
Background technique
Anaerobic digestion refers to that organic matter is stabilized by the metabolic activity of microorganism under anaerobic, while with
Methane and CO2The biochemical process of generation.This process is divided into hydrolysed ferment stage, acidification stage and methane phase stage by Byrant.
The hydrolysed ferment stage is mainly that hydrolysed ferment bacterium is worked, and middle complicated organic matter is in cellulose-decomposing bacterium and albumen in this stage
It is hydrolyzed and ferments under the effect of the hydrolysed ferments bacterium such as matter hydrolytic bacteria, be converted into small organic molecule；Acidification stage is then to produce
Under the action of hydrogen acetogen, the intermediate product that the first stage in addition to formic acid, acetic acid, methylamine, methanol is generated, such as fat
The sour soluble small moleculars such as (propionic acid, butyric acid) and alcohols (ethyl alcohol) are converted into acetic acid, H2And CO2；The methane phase stage, methane backeria was first
Acid, acetic acid, methylamine, methanol and (H2+CO2) etc. matrix methane is converted by different paths, wherein most important matrix is
Acetic acid and (H2+CO2)。
The Anaerobic Digestion technological investment of rubbish is at high cost, but its environmental benefit is high, and can produce good warp
Ji benefit (biogas can be used to generate electricity, heat supply and biogas residue can produce the fertilizer of high-quality health).Currently, anaerobic digestion techniques exist
It being widely applied all over the world, the nearly eighty per cant above civil natural gas of Germany derives from the biogas that anaerobic digestion generates,
There is fairly large biogas project in states such as Italy, Switzerland, Austria and Britain.China's anaerobic digestion techniques are from 1973
Year starting, experienced 10 years instability development stages, 10 year adjusting stage and 5 years stages of steady development, into 21 century
Since, start to continue, rapidly develop.The anaerobic digestion techniques in China are still at an early stage, and development potentiality is huge.
General anaerobic digestion techniques require solid content between 3-5%, and fermentation pattern is in a liquid state, and disappears in this way for anaerobism
The requirement for changing equipment volume is big, and cost and operating cost are high, and biogas slurry is more in concurrent anaerobic digestion residue, subsequent processing at
This is big；The unit volume content of organic matter is low in such anaerobic System, and response intensity is relatively small, and methane production is inclined
It is low.
The solid anaerobic digestion solid content of height can reach 10-20%, and biogas slurry amount is small, and reactor volume is small, and cost of investment is low；Reaction
System volumetric loading is high, and microorganism concn is big, can effectively improve response intensity and volumetric gas production rate；Since liquid content is few,
System is more stable, and treatment effect is relatively more preferable.
Chinese patent CN106434763A discloses a kind of vertical continuous anaerobic dry fermentation method, is that high solid content gives up
Object and inoculum carry out fermentation methane phase in fermentor after evenly mixing.Residue after fermentation is in spiral discharge device
It carries out solid-liquid separation into biogas slurry and biogas residue.The reflux of part biogas slurry, and with 6 times a day, the spray flow of 0.5L/kg material is sprayed to hair
In fermentation tank；Part biogas residue is as inoculum, it is desirable that inoculum solid content is greater than 35%.The fermentation period of the invention need to guarantee to reach
25 days or more, fermentation time was long, and in long-term fermentation process, the reflux of percolate causes operation cost to rise；Utilize biogas residue
It needs to be arranged solid-liquid separating equipment as inoculum, improves cost.And the gas generation property of this method is not described, no in patent
It can be advantageously applied in actual production.
Chinese patent CN102925494A, which is disclosed, a kind of using animal waste and crop straws for producing biogas and to be had
The method of machine fertilizer, be by dry substance concentration greater than 15% solid-state feces of livestock and poultry and by pretreated agricultural crop straw according to
Certain proportion enters anaerobic dry fermentation apparatus together with the activated sludge by domestication, and a small amount of biogas slurry generated in fermentation process is returned
Receipts are re-used as inoculum, and fermentation residues produce organic fertilizer through secondary compost.Such method does not solve under high solid content simultaneously, detests
Oxygen digests the slow problem of system mass transfer rate, cannot effectively promote the efficiency of high solid anaerobic digestion gas production.And it is only retouched in patent
The methane content for having stated production gas is stablized in 50-65%, it is not specified that gas production, delay time and fermentation period etc. are unfavorable for
Subsequent applications.
Chinese patent CN107723332A provides a kind of method that compression straw anaerobic dry fermentation produces biogas, and this method is logical
Selection suitable microbial inoculum, additive and processing step are crossed, the purpose for producing biogas to the anaerobic dry fermentation of compression stalk is realized.This
Although kind of method gas producing efficiency is high, anaerobic digestion needs to reach 63 days reaction time, overlong time, and system after 28 days
Biocoene starts spray after stablizing can't achieve the effect that promote biofacies well contacts with substrate, and spray efficiency is opposite
It is lower.
Therefore it provides it is a kind of can significantly improve stalk height and consolidate the method for anaerobic digestion methane phase have become this field urgently
Technical problem to be solved.
Summary of the invention
In order to solve the above shortcomings and deficiencies, the purpose of the present invention is to provide a kind of raising stalk height to consolidate anaerobic digestion
The method of methane phase.After this method inoculation liquid immersion treatment ensiling stalks, is put into garage type anaerobic reactor and detested
Oxygen digestion, reactor head sprays and inoculation liquid out partially resides on material with after the of short duration contact of material, and part is deeply
In the percolate of bottom, flows back to top again under the pumping action that flows back and be sprayed in reactor again.
In order to achieve the above objectives, the present invention provides a kind of method for improving stalk height and consolidating anaerobic digestion methane phase, wherein institute
The method of stating includes:
(1) ensiling stalks are soaked in inoculation liquid, to be pre-mixed to it；Wherein, the solid content of ensiling stalks is
20%-30%；
(2) mixture obtained by step (1) is added in garage type anaerobic reactor, so that the mixture carries out anaerobic digestion
Generate methane；
(3) by the way that biogas slurry is back at the top of garage type anaerobic reactor and is sprayed in reactor in anaerobic digestion process
To realize mass transfer.
Specific embodiment according to the present invention is consolidated in the method for anaerobic digestion methane phase, the vehicle in the raising stalk height
Library formula anaerobic reactor is the conventional equipment that uses of this field, by dry fermentation room, diafiltration liquid storage tank, leachate tail water pump and
The structure compositions such as temperature-detecting device, percolate are carried out spray reflux through circulating pump sucking fermentor, are carried out using timing system
Inoculation liquid spray.
Specific embodiment according to the present invention is consolidated in the method for anaerobic digestion methane phase, ensiling straw in the raising stalk height
The solid content of stalk is 30%.
Specific embodiment according to the present invention is consolidated in the method for anaerobic digestion methane phase, the blueness in the raising stalk height
The partial size for storing stalk is 2-5cm；Preferably 2-3cm.
Specific embodiment according to the present invention is consolidated in the method for anaerobic digestion methane phase, the leaching in the raising stalk height
Steeping the time is 1-4 hours, preferably 2 hours.
Specific embodiment according to the present invention is consolidated in the method for anaerobic digestion methane phase in the raising stalk height, described to connect
Kind liquid is the inoculation liquid tamed under 37 DEG C of constant temperatures in advance；
Preferably, the inoculation liquid includes refuse landfill activated sludge or the biogas plant's biogas slurry being currently running.
Wherein, refuse landfill activated sludge or the biogas plant's biogas slurry being currently running are this field conventional substances, this
Field technical staff can routinely obtain, and such as in the specific embodiment of the invention, which can be next
From the activated sludge of Beijing's A Suwei refuse landfill.
Specific embodiment according to the present invention is consolidated in the method for anaerobic digestion methane phase in the raising stalk height, described to detest
Oxygen digestion period is 28 days, and reaction temperature is 37 ± 1 DEG C, and pH does not make adjustments.
Specific embodiment according to the present invention is consolidated in the method for anaerobic digestion methane phase in the raising stalk height, described to detest
Oxygen digestion period is 14 days.
Specific embodiment according to the present invention is consolidated in the method for anaerobic digestion methane phase, the spray in the raising stalk height
Drenching time interval is 3-10 hours, and each spray time is 1-30 minutes.
Specific embodiment according to the present invention is consolidated in the method for anaerobic digestion methane phase, the spray in the raising stalk height
Drenching time interval is 6-8 hours, and each spray time is 2-6 minutes.
Specific embodiment according to the present invention is consolidated in the method for anaerobic digestion methane phase, the spray in the raising stalk height
Leaching mode uses: the last fortnight is 4-6 minutes each, and in 2-3 minutes every time third week, 4th week does not spray, and 6-8 is divided between spray time
Hour.
Specific embodiment according to the present invention is consolidated in the method for anaerobic digestion methane phase, the spray in the raising stalk height
Leaching mode uses: the last fortnight 4 minutes every time, in 2 minutes every time third week, 4th week did not sprayed, and was divided between spray time 6 hours.
Currently, the existing high solid anaerobic digestion techniques in this field are there are still many deficiencies, reason is mainly high solid anaerobism
Moisture content is low in digestion system, influences mass transfer rate, the progress of substrate degraded with reacted then is influenced, to anaerobism in system
The activity of microorganism has an impact, the final gas production rate and efficiency for influencing reaction system；Meanwhile nothing between substrate and microorganism
Method is sufficiently mixed, and the organic loading of reaction system part can be excessively high, is easy to produce acidification phenomenon, this influences whether that methanogen is thin
Absorption of the born of the same parents for fatty acid；In addition, the generation of a large amount of water-soluble organic acids and hydrogen sulfide caused by acidification phenomenon, to inhibit
The growth of methanogen.
This method provided by the present invention preferably suitably sprays mode to the return-flow system of high solid anaerobic System, can
To effectively improve mass-transfer efficiency, reinforces contacting between substrate and microorganism, promote the life of the microorganism in anaerobic System
Long and enrichment, improves the efficiency of anaerobic digestion methane phase；Enter the stabilization sub stage in digestion, i.e. methanogen richness is increased to
After certain phase, do not recommend to flow back, because persistently reflux energy consumption is higher, methane production raising is also limited, and early period is (as before
Two weeks) it sprays, mid-term (such as third week) mode that spray, later period (such as 4th week) do not spray less more, it is produced in 14 days total
The 80% of gas production, gas production can reach 188mL/g (with CH4/ VS meter), energy consumption is largely saved, while dropping significantly
Water content in low biogas residue, convenient for the processing such as subsequent compost.
The present invention improves mass transport process using spray-filtration cycle, optimizes the technological parameter of high solid anaerobic System, choosing
Optimal solid content, spray duration and spray interval are taken, stalk has not been disposed only effectively, has accomplished the harmless of solid waste
Change, minimizing and recycling, and improve the methane phase efficiency that stalk height consolidates anaerobic digestion；Guaranteeing gas producing efficiency simultaneously
Reduce processing cost to the maximum extent simultaneously.Anaerobic digester system is stable, and stalk treatment effect is preferable, energy recovery rate compared with
It is high.For needing to carry out high solid anaerobic fermentation system the project of volume reduction, the present invention has good research application prospect.
Detailed description of the invention
Figure 1A is that methane production changes over time relational graph under different solid contents in the embodiment of the present invention 1: (a) methane is accumulated
Yield；
Figure 1B is that methane production changes over time relational graph: (b) week methane production under different solid contents in the embodiment of the present invention 1
Amount；
Fig. 2A is that methane production changes over time relational graph under different spray durations in the embodiment of the present invention 2: (a) methane is tired
Product yield；
Fig. 2 B is that methane production changes over time relational graph: (b) all methane under different spray durations in the embodiment of the present invention 2
Yield；
Fig. 3 A is that the different lower methane productions in spray interval change over time relational graph in the embodiment of the present invention 3: (a) methane is tired
Product yield；
Fig. 3 B is spaced lower methane productions for sprays different in the embodiment of the present invention 3 and changes over time relational graph: (b) all methane
Yield；
Fig. 4 A is when being divided into 6h between spraying in the embodiment of the present invention 3, and methane production changes over time relational graph: (a) methane
Cumulative production；
Fig. 4 B is when being divided into 6h between spraying in the embodiment of the present invention 3, and methane production changes over time relational graph: (b) all first
Alkane yield；
Fig. 5 is between spraying in the embodiment of the present invention 3 when being divided into 6h, in fermentation process system volatile fatty acid (VFA) with
Time-varying relationship figure；
Fig. 6 is between spraying in the embodiment of the present invention 3 when being divided into 6h, and system pH and ammonia nitrogen concentration be at any time in fermentation process
Variation relation figure.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now in conjunction in detail below
Embodiment carries out following detailed description to technical solution of the present invention, but should not be understood as the limit to enforceable range of the invention
It is fixed.
Embodiment 1
Present embodiments provide a kind of method for improving stalk height and consolidating anaerobic digestion methane phase, wherein the described method includes:
Raw material: corn stover；
Production stage:
(1) by Silage Corn Straw that partial size is 2-3cm with mixing distilled water be adjusted to its solid content be respectively 15%,
20%, 30%, inoculation liquid is the domestication biogas slurry taken out in 37 DEG C of constant incubators in advance, first uses inoculation liquid before experiment starts
Raw material 2h is impregnated respectively.
(2) mixture obtained by step (1) is added in the dry fermentation room of garage type anaerobic reactor again, is carried out from top
Spray is returned, spray mode uses the last fortnight 6 minutes every time, and in 3 minutes every time third week, 4th week does not spray, spray time interval
It is 3 hours.The reaction time that mixed raw material anaerobic digestion in reactor generates methane is 28 days.Reaction temperature is 37
± 1 DEG C, pH does not make adjustments.
Measurement produces air volume at regular intervals in 28 days that reaction carries out, and draws methane production under different solid contents
Change over time relational graph, wherein methane cumulative production schematic diagram is as shown in Figure 1A, all methane production schematic diagram such as Figure 1B institute
Show, as can be seen that methane cumulative production highest reaches 79.66L when solid content is 30% from Figure 1A and Figure 1B
(193.6mL/g is (with CH4/ VS meter))；And solid content be 15% and 20% when, methane cumulative production is respectively 61.25L
(148.9mL/g is (with CH4/ VS meter)) and 54.81L (133.2mL/g is (with CH4/ VS meter)).Three groups were produced at the 7th day or so
Methane content increases sharply, and methane phase total amount has reached stabilization substantially when by the 20th day or so.
Embodiment 2
Present embodiments provide a kind of method for improving stalk height and consolidating anaerobic digestion methane phase, wherein the described method includes:
Raw material: corn stover；
Production stage:
(1) Silage Corn Straw that partial size is 2-3cm is adjusted its solid content with mixing distilled water is 30%, and inoculation liquid is
The domestication biogas slurry taken out in 37 DEG C of constant incubators in advance, first impregnates raw material 2h respectively before experiment starts with inoculation liquid.
(2) mixture obtained by step (1) is added in the dry fermentation room of garage type anaerobic reactor again, is carried out from top
Return spray, spray mode is respectively adopted mode one: the last fortnight 6 minutes every time, 3 minutes every time third week, 4th week do not spray (with
(6,3,0) it indicates)；
Mode two: the last fortnight 4 minutes every time, 2 minutes every time third week, 4th week do not spray (with (4,2,0) expression)；
Mode three: the last fortnight 2 minutes every time, 1 minute every time third week, 4th week do not spray (with (2,1,0) expression).
Spray time interval is 3 hours.The reaction time that mixed raw material anaerobic digestion in reactor generates methane is 28 days.
Reaction temperature is 37 ± 1 DEG C, and pH does not make adjustments.
Measurement produces air volume at regular intervals in 28 days that reaction carries out, and draws methane under different spray durations and produce
Amount changes over time relational graph, wherein methane cumulative production schematic diagram is as shown in Figure 2 A, all methane production schematic diagrames such as Fig. 2 B institute
Show, as can be seen that one group of methane production of a length of (6,3,0) reaches 80.85L (196.5mL/g when spraying from Fig. 2A and Fig. 2 B
(with CH4/ VS meter)), the result under experiment condition same as Example 1 is partly due to percolate property compared to slightly being promoted
Promotion；And two groups of methane productions of (4,2,0) a length of when spraying and (2,1,0) be respectively 76.42L (186.5mL/g (with
CH4/ VS meter)) and 53.04L (128.9mL/g is (with CH4/ VS meter)).It can be seen that (4,2,0) one group of methane phase performance with (6,
3,0) it is not much different, the methane production in mode two only fewer than the methane production in mode one 5.1%, and spray time is got over
It is long, it consumes energy bigger, specifically (4,2,0) energy consumption reduces 1/3 than (6,3,0).
Embodiment 3
Present embodiments provide a kind of method for improving stalk height and consolidating anaerobic digestion methane phase, wherein the described method includes:
Raw material: corn stover；
Production stage:
(1) Silage Corn Straw that partial size is 2-3cm is adjusted its solid content with mixing distilled water is 30%, and inoculation liquid is
The domestication biogas slurry taken out in 37 DEG C of constant incubators in advance, first impregnates raw material 2h respectively before experiment starts with inoculation liquid.
(2) mixture obtained by step (1) is added in the dry fermentation room of garage type anaerobic reactor again, is carried out from top
Spray is returned, spray mode is not sprayed using the last fortnight 4 minutes every time, 2 minutes every time third week, 4th week.Spray time interval
Respectively 3 hours, 6 hours, 8 hours.The reaction time that mixed raw material anaerobic digestion in reactor generates methane is 28
It.Reaction temperature is 37 ± 1 DEG C, and pH does not make adjustments.
Measurement produces air volume at regular intervals in 28 days that reaction carries out, and draws the different lower methane in sprays interval and produce
Amount changes over time relational graph, wherein methane cumulative production schematic diagram is as shown in Figure 3A, all methane production schematic diagrames such as Fig. 3 B institute
Show, from Fig. 3 A and Fig. 3 B as can be seen that when being divided into 3h between spray, methane production reach 78.23L (190.1mL/g (with
CH4/ VS meter)), when being divided into 6h between spray (methane cumulative production and all methane production schematic diagrames reference may also be made to Fig. 4 A and Fig. 4 B),
Methane production is very nearly the same, is that (188.2mL/g is (with CH by 77.43L4/ VS meter)), and when being divided into 8h between spray, methane phase
It can differ larger, methane production only has 53.56L, and (130.2mL/g is (with CH4/ VS meter))；
In addition, when being divided into 6h in the present embodiment, between spray, in fermentation process, system volatile fatty acid (VFA) is at any time
Variation relation figure is as shown in Figure 5；It is as shown in Figure 6 to change over time relational graph for system pH and ammonia nitrogen concentration in fermentation process；
By the present embodiment it is found that the mixed liquor of 30% solid content of selection is as fermentation substrate, with the last fortnight 4 minutes every time,
In 2 minutes every time third week, 4th week does not spray, and 6 hours spray modes are divided between spray time and carry out the obtained hair that ferments
Ferment result is preferable；Being fermented under the technological parameter can not only guarantee that high solid anaerobic System efficiently produces in a short time
Gas can also reduce spray bring energy consumption to the maximum extent, reduce process costs.
Claims (10)
1. a kind of method for improving stalk height and consolidating anaerobic digestion methane phase, which is characterized in that the described method includes:
(1) ensiling stalks are soaked in inoculation liquid, to be pre-mixed to it；Wherein, the solid content of ensiling stalks is 20%-
30%, preferably 30%；
(2) mixture obtained by step (1) is added in garage type anaerobic reactor, so that the mixture carries out anaerobic digestion generation
Methane；
(3) by the way that biogas slurry is back at the top of garage type anaerobic reactor and is sprayed in reactor with reality in anaerobic digestion process
Existing mass transfer.
2. the method according to claim 1, wherein the partial size of the ensiling stalks is 2-5cm.
3. according to the method described in claim 2, it is characterized in that, the partial size of the ensiling stalks is 2-3cm.
4. the method according to claim 1, wherein the soaking time is 1-4 hours, preferably 2 hours.
5. the method according to claim 1, wherein the inoculation liquid is to carry out under 37 DEG C of constant temperatures in advance
The inoculation liquid of domestication；
Preferably, the inoculation liquid includes refuse landfill activated sludge or the biogas plant's biogas slurry being currently running.
6. the method according to claim 1, wherein the anaerobic digestion period be 28 days, reaction temperature 37
± 1 DEG C, pH does not make adjustments；
Preferably, the anaerobic digestion period is 14 days.
7. according to the method described in claim 6, it is characterized in that, being divided between the spray time 3-10 hours, each spray
Time is 1-30 minutes.
8. the method according to the description of claim 7 is characterized in that being divided between the spray time 6-8 hours, every time when spray
Between be 2-6 minutes.
9. according to the described in any item methods of claim 6-8, which is characterized in that the spray mode uses: the last fortnight is each
4-6 minutes, in 2-3 minutes every time third week, 4th week did not sprayed, and is divided between spray time 6-8 hours.
10. according to the method described in claim 8, it is characterized in that, the spray mode uses: the last fortnight 4 minutes every time, the
2 minutes every time three weeks, 4th week did not sprayed, and was divided between spray time 6 hours.
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|---|---|---|---|---|
| CN115433742A (en) * | 2022-08-12 | 2022-12-06 | 中国林业科学研究院林产化学工业研究所 | Method for co-producing biogas and organic fertilizer by solid anaerobic fermentation of agriculture and forestry residues |
| CN115433742B (en) * | 2022-08-12 | 2024-03-19 | 中国林业科学研究院林产化学工业研究所 | Method for co-producing biogas and organic fertilizer from agricultural and forestry residues through solid anaerobic fermentation |
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