CN105603001A - Aerobic-anaerobic coupled semicontinuous feeding methane fermentation method capable of recycling methane liquid - Google Patents

Aerobic-anaerobic coupled semicontinuous feeding methane fermentation method capable of recycling methane liquid Download PDF

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CN105603001A
CN105603001A CN201610083152.1A CN201610083152A CN105603001A CN 105603001 A CN105603001 A CN 105603001A CN 201610083152 A CN201610083152 A CN 201610083152A CN 105603001 A CN105603001 A CN 105603001A
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fermentation
biogas
semicontinuous
aerobic
methane
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CN105603001B (en
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茆军
王卉
山其米克
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Biomass Energy Research Institute Xinjiang Academy Of Agricultural Sciences
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Biomass Energy Research Institute Xinjiang Academy Of Agricultural Sciences
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    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12PFERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P5/00Preparation of hydrocarbons or halogenated hydrocarbons
    • C12P5/02Preparation of hydrocarbons or halogenated hydrocarbons acyclic
    • C12P5/023Methane
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/02Biological treatment
    • C02F11/04Anaerobic treatment; Production of methane by such processes
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/20Sludge processing

Abstract

The invention discloses an aerobic-anaerobic coupled semicontinuous feeding methane fermentation method capable of recycling methane liquid. The method comprises the following steps: on the basis of normal operation of a methane device, recycling methane liquid as a methane fermentation material, soaking the material, and performing aerobic/anaerobic coupled pretreatment, wherein the pretreated material serves as an update material for methane fermentation; and performing single-batch or semicontinuous feeding fermentation by use of a methane fermentation device. Discharging is performed firstly and then feeding is performed according to the principle of equal feeding quantity and discharging quantity in a material updating process; in a semicontinuous feeding fermentation process, a daily material updating mode is adopted, and the material discharged by the methane device and the methane liquid are soaked; materials not used in the aerobic/anaerobic coupled pretreatment are mixed so as to be further pretreated for recycling; during an operation process of the methane fermentation device, the daily gas yield is detected so as to determine whether to replace the pretreatment raw material according to daily methane yield variation, so that the effects of improving the methane yield, prolonging the efficient methane production period and the operation period of the methane device are achieved, and the method has wide applicability.

Description

A kind of natural pond liquid reuse aerobic anaerobism is coupled semicontinuous feed supplement biogas fermentation method
Technical field
The invention belongs to the technical field of biogas fermentation engineering. Specifically, the present invention relates to a kind of natural pond liquid that adopts refluxesAerobic/anaerobism be coupled the technical field of mixed culture fermentation biogas.
Background technology
Biogas, is also called biogas, is mainly to utilize animal wastes, stalk, industrial organic waste, domestic wasteProduce by microbiological anaerobic digestion techniques Deng organic matter, in the biogas producing, contained main component-methane accounts for its total amount40-80%. Every cubic metre of biogas completing combustion is equivalent to 0.7 kilogram of standard coal heat producing that burns, and therefore, biogas isA kind of important renewable bioenergy.
At present, taking agriculture organic resource as basic biogas production technology, main production raw material is animal wastes or cropStalk, and ight soil-stalk mixture. The raw material basic metabolism concentration of substrate providing of degrading is provided biogas fermentation, and raw materialUnder anaerobic digestion, there is certain degradation characteristic and periodic process, therefore in biogas production, improve biogas production rate and often will contractThe bob ferment production cycle, improve fermenting and producing device and reload frequency to maintain biogas generation metabolism substrate concentration in fermentation system,Raw material availability is low. Therefore, multiple preconditioning technique and zymotechnique in biogas production, been have now have been researched and developed to improve biogasFermentation efficiency, prolongation fermentation period.
Existing patent documentation discloses a kind of aerobic and anaerobism coupling two-phase fermentation methane production process, and (application number is201510362882.0), by the time carrying out the aerobic hydrolysed ferment of wet feed, added wooden mould and these two kinds of microbial inoculums of aspergillus niger, butThe amount that is microbial inoculum has important effect for the aerobic hydrolysed ferment of wet feed, too many and be all unfavorable for very little fermentation, simultaneously forThe amount of microbial inoculum does not limit. Meanwhile, in the process of the aerobic hydrolysed ferment of wet feed, the bacterium needing is diversified, only according toWood is mould is unfavorable for the aerobic hydrolysed ferment of wet feed with these two kinds of microbial inoculums of aspergillus niger, does not adopt supplying technics just according to conventional additiveMaterial is disposable fermentation, and raw material availability is low, and self objectively exists technical deficiency and defect.
Aspect pretreatment of raw material, existing existing employing as the chemical method of acid treatment, alkali treatment, mechanical crushing, as quick-fried vapour methodPhysical, enzyme process and as supercritical ultrasonics technology combines with enzyme process, the applied in any combination of ultrasonic wave and alkaline process distinct methods, also haveThe application technology of using microbe microbial inoculum processing, as stalk corruption microbial inoculum. In addition, traditional biodegradation technique is also sent out at biogasIn ferment pretreatment, be applied, as compost, straw ensiling, natural pond immersion bubble etc.
At marsh gas fermentation process technical elements, China in 1987 study and reported the semicontinuous fed-batch fermentation work of mixed culture fermentationSkill, with green grass and pig manure mixing feed supplement for adding raw material to extend installation for fermenting fermentation period, the current biogas dress of Zhe Yeshi ChinaPut the main technique technology of operation; The two-step fermentation work that biogas solid state fermentation combines with liquid state fermentation has been reported in research in 1989Technology, solves solid state fermentation acidifying excessively and the problem of conventional liq fermentation subacidity. At present, external big-and-middle-sized biogas engineeringMore first carry out efficient operation process and mainly adopt two step anaerobic digestion zymotechniques, by the hydrolysis/product in anaerobic digestion processAcid is carried out physical separation with methanation, thereby holds as feed supplement reaches methanation to be hydrolyzed/to produce sour anaerobic digestion productContinuous efficient. At present, existing these general semicontinuous fermentation technology, although can effectively extend technically the operation of firedamp gas equipmentIn the cycle, improve fermentation efficiency, but there are the following problems:
(1) raw material Renewal process causes the microorganism species amount of biogas fermentation system to decline, and affects biogas fermentation efficient aerogenesis.
(2) in feed supplement operation, material is disposable fermentation, and raw material availability is low. The solid-state solid material of being combined with liquid state fermentationAlthough in continuous processing, utilization rate entirety is lower, and must outfit adapt to obtain solid-state fermentation installation etc.
(3) conventional feed supplement semicontinuous fermentation and two-step method fermentation, discharging in a large number natural pond liquid in the same amount of changing material cannot profitWith, be secondary pollution.
Therefore, from marsh gas fermentation process application analysis, need further to improve raw material availability, biogas fermentation effectRate, and the emission problem of contaminated solution thing.
Summary of the invention
Low for marsh gas fermentation process technology Raw utilization rate, factor of created gase is low, discharge in a large number natural pond liquid be difficult to utilize easily makeThe present situation that becomes secondary pollution problem, the present invention aims to provide one and utilizes natural pond liquid reuse, under aerobic/anaerobism replaces change condition" aerobic/anaerobism is coupled " material handling carry out the technical method of fed-batch fermentation. By natural pond provided by the invention immersion bubble aerobic/Anaerobism is coupled the technical method of processing biogas fermentation material, can effectively maintain firedamp gas equipment high yield gas efficiency, extends firedamp gas equipmentThe efficient aerogenesis time, improve utilization of materials, there is applied value widely.
Patent of the present invention adopts main technical scheme:
The present invention is on the basis of the normal operation of firedamp gas equipment, and biogas fermentation material adopts natural pond liquid reuse to soak, and carries out aerobic/detestOxygen is coupled pretreatment, and pretreated material is as the renewal material of biogas fermentation, and the list that carries out biogas fermentation device is criticized or halfContinuous feeding fermentation; In material renewal process, adopt input and output material equivalent principle, first discharging, rear feeding; Send out semicontinuous feed supplementIn ferment process, adopt a day renewal material mode, material that firedamp gas equipment is discharged and natural pond immersion bubble, aerobic/anaerobism is coupled pretreatmentUntapped material mixes mutually, proceeds pretreatment, recycles; In biogas fermentation device running, detect every daily outputGas rate, according to daily gas rate, variation determines whether pretreated feedstock needs to change, thereby reaches efficiently product of the biogas rate that improves, prolongationThe effect of gas cycle and the firedamp gas equipment cycle of operation.
The present invention specifically provides a kind of natural pond liquid reuse aerobic/anaerobism that adopts to be coupled semicontinuous feed supplement biogas fermentation method, systemPreparation Method concrete steps are as follows:
(1) pretreatment of stalk: stalk is rubbed broken processing, broken stalk reach sway or 100rpm stir under present thingReason can suspended state.
(2) fermentation materials preparation and processing: the stalk total solid 12% preparation fermentation of preparing by ight soil and step (1)Material, liquid phase is backflow biogas slurry; The material preparing carries out aerobic, anaerobism replaces combined pretreatment.
(3) biogas anaerobic fermentation: biogas fermentation material prepared by step (2) carries out anaerobic fermentation in installation for fermenting,Fermentation temperature is 30-45 DEG C, produces biogas.
(4) add preparation and the pretreatment of material: add the preparation and pre-place of material by the described method of step (2)Reason; According to fermentation demand, the concentration of adding material preparing is 1-1.5 times of Fermentable substrate material concentration.
(5) detect: detect biogas anaerobic fermentation volume yield rate every day, set the minimum aerogenesis standard of biogas fermentation device,In the time that dropping to minimum factor of created gase standard, firedamp gas equipment factor of created gase carries out semicontinuous fed-batch fermentation.
(6) semicontinuous fed-batch fermentation: prepared by step (4) add, and material stops ventilation for 6 hours before use, stirs, andBe warming up to 28-30 DEG C; Carry out feed supplement operation by first discharging, rear feeding, turnover material equal-volume principle, and every day material moreThe amount of changing is the 10-15% of biogas fermentation device charge, and the material that firedamp gas equipment is discharged is mixed mutually with the untapped material of adding,Proceed aerobic, anaerobism and be coupled alternately combined pretreatment, recycle, until semicontinuous fed-batch fermentation factor of created gase drops to biogasThe minimum aerogenesis standard update of installation for fermenting is added material, continues semicontinuous fed-batch fermentation.
(7) natural pond liquid refluxes: the material of adding that step (6) is changed carries out Separation of Solid and Liquid, and gained natural pond liquid is back to step(2) add preparation and the pretreatment of material.
In the present invention, described aerobic, anaerobism is coupled alternately combined pretreatment and is: material is 22 DEG C, throughput in temperatureFor the 20-30min that ventilates under 0.1V/Vmin, 100rpm stirring condition, stop ventilation and stir, leave standstill 4h; Lead to againGas, stirring operation, the processing of material continuous circulation.
Natural pond liquid reuse aerobic/anaerobism that the inventive method that the inventive method provides provides is coupled semicontinuous feed supplement biogas and sends outFermenting process and can effectively improve firedamp gas equipment fermentation efficiency in the technologic application of semicontinuous fed-batch fermentation. Semicontinuous fed-batch fermentationInstall in 30 days and complete the fermentation of twice single batch fermentation material, fermentation efficiency is 1.6 times of single batch fermentation.
The pretreatment of the stalk that the present invention adopts, biogas anaerobic fermentation, natural pond liquid reflux, aerobic/anaerobism is coupled semicontinuous benefitAlthough the technological means such as material be unable to do without support and the inspiration of prior art,, be coupled the pre-place of alternately associating for aerobic, anaerobismThe condition of reason material, the factor such as time and amount of semicontinuous fed-batch fermentation are for determining that liquid reuse aerobic/anaerobism in natural pond is coupled halfThe effect of continuous feeding biogas fermentation method all has important effect, is also deciding factor, not the technology hand of talkative employingSection and instrument are prior aries, and then negate that entirety preparation natural pond liquid reuse aerobic/anaerobism provided by the invention is coupled semicontinuous benefitThe novelty of material biogas fermentation method, existing all technological inventions and innovation all be unable to do without support and the basis of prior art. ExistingAlthough there are a large amount of visible records that disclose about biogas " single batch fermentation " in technology, the present invention is mainly for adopting in biogas fermentationIn semicontinuous fed-batch fermentation, the employing natural pond liquid reuse aerobic/anaerobism of creation is coupled semicontinuous feed supplement marsh gas fermentation process technical sideCase. Visible, liquid reuse aerobic/anaerobism in natural pond provided by the invention is coupled the each technical factor in semicontinuous feed supplement biogas fermentation methodAll pass through comprehensive consideration and design with technical parameter, liquid reuse aerobic/anaerobism in natural pond provided by the invention is coupled semicontinuous feed supplement natural pondIn gas fermentation process, each sport technique segment has upper and lower one, and any technical step is indispensable, tight indivisible feature, noCan approbate and reprobate dismember technical step wherein.
Can reach following beneficial effect by implementing the concrete summary of the invention of the present invention:
(1) natural pond liquid reuse aerobic/anaerobism that the inventive method provides is coupled semicontinuous feed supplement biogas fermentation method and can maintains natural pondThe operation of gas installation for fermenting continuous high-efficient, improves firedamp gas equipment service efficiency; Fermentation materials replaced through aerobic stage and anaerobic stageCircular treatment, improves material utilization ratio 20%, improves fermentation efficiency 15%.
(2) natural pond liquid reuse aerobic/anaerobism that single batch fermentation and the inventive method provide is coupled semicontinuous feed supplement biogas fermentationMethod is compared, and semicontinuous fed-batch fermentation device completes the fermentation of twice single batch fermentation material in 30 days, and fermentation efficiency is single wholesale1.6 times of ferment, illustrate that natural pond liquid reuse aerobic/anaerobism that the inventive method that the inventive method provides provides is coupled semicontinuous feed supplementBiogas fermentation method and can effectively improve firedamp gas equipment fermentation efficiency in the technologic application of semicontinuous fed-batch fermentation.
(3) natural pond liquid reuse aerobic/anaerobism that the inventive method that the inventive method provides provides is coupled semicontinuous feed supplement natural pondGas fermentation process, can process the raw material such as agricultural crop straw, green grass for biogas fermentation, stalk, the green grass of ensiling preservation processingDeng fermentation raw material, and the mixture of stalk and ight soil, the mixing that realizes various materials is used.
(4) natural pond liquid reuse aerobic/anaerobism that the inventive method that the inventive method provides provides is coupled semicontinuous feed supplement natural pondGas fermentation process, natural pond liquid reuse can effectively reduce discharging of waste liquid in biogas production, reduces the use amount of water, reduces production costs.
Brief description of the drawings
Fig. 1 is shown as ight soil-stalk pretreatment material biogas single batch fermentation design sketch.
Fig. 2 is shown as ight soil-stalk pretreatment material biogas single batch fermentation and semicontinuous fed-batch fermentation design sketch.
Fig. 3 is shown as ight soil-ensiling stalks pretreatment material biogas single batch fermentation and semicontinuous fed-batch fermentation amplification effectFigure.
Fig. 4 is shown as ight soil-ensiling stalks pretreatment material biogas single batch fermentation and semicontinuous fed-batch fermentation design sketch.
Fig. 5 is shown as stalk, ensiling stalks is added the semicontinuous fed-batch fermentation design sketch of raw material.
Fig. 6 is shown as the blue or green weeds in farmland and adds the semicontinuous fed-batch fermentation design sketch of raw material.
Detailed description of the invention
, for embodiment, the present invention is described below, still, the present invention is not limited to following embodiment.
But do not limit enforcement of the present invention, in addition, in following explanation, if no special instructions, all % that relate to allRefer to m/v mass percent or weight part ratio meter.
In the present embodiment, described aerobic, anaerobism replaces combined pretreatment and is: material is that 22 DEG C, throughput are in temperatureThe 20-30min that ventilates under 0.1V/Vmin, 100rpm stirring condition, stops ventilation and stirs, and leaves standstill 4h; Ventilate again,Stirring operation, the processing of material continuous circulation.
In the present embodiment, what single batch fermentation adopted is common, ight soil-mixed stalk raw material, anaerobism mesophilic digestion technologyScheme, by 12% solid content preparation fermentation materials, constant temperature anaerobic fermentation produces biogas at 32 DEG C, and the method that the present invention adopts isBase oneself upon in semicontinuous feed supplement biogas fermentation technical field the semicontinuous feed supplement natural pond that specifically adopts natural pond liquid reuse aerobic/anaerobism to be coupledGas zymotechnique.
Embodiment mono-: adopt liquid reuse aerobic/anaerobism in natural pond to be coupled semicontinuous feed supplement biogas fermentation method
The present invention specifically provides a kind of natural pond liquid reuse aerobic/anaerobism that adopts to be coupled semicontinuous feed supplement biogas fermentation method, specifically systemPreparation Method is:
(1) pretreatment of stalk: stalk is rubbed broken processing, broken stalk sways or 100rpm stir process, until brokenCrushing straw presents physics can suspended state.
(2) fermentation materials preparation and processing: the stalk total solid 12% preparation fermentation of preparing by ight soil and step (1)Material, liquid phase is backflow biogas slurry; The material preparing carries out aerobic, anaerobism replaces combined pretreatment.
(3) biogas anaerobic fermentation: biogas fermentation material prepared by step (2) carries out anaerobic fermentation in installation for fermenting,Fermentation temperature is 30-45 DEG C, produces biogas.
(4) add preparation and the pretreatment of material: add the preparation and pre-place of material by the described method of step (2)Reason; According to fermentation demand, the concentration of adding material preparing is 1-1.5 times of Fermentable substrate material concentration.
(5) detect: detect biogas anaerobic fermentation volume yield rate every day, set the minimum aerogenesis standard of biogas fermentation device,In the time that dropping to minimum factor of created gase standard, firedamp gas equipment factor of created gase carries out semicontinuous fed-batch fermentation.
(6) semicontinuous fed-batch fermentation: prepared by step (4) add, and material stops ventilation for 6 hours before use, stirs, andBe warming up to 28-30 DEG C; Carry out feed supplement operation by first discharging, rear feeding, turnover material equal-volume principle, and every day material moreThe amount of changing is the 10-15% of biogas fermentation device charge, and the material that firedamp gas equipment is discharged is mixed mutually with the untapped material of adding,Proceed aerobic, anaerobism replaces combined pretreatment, recycle, until semicontinuous fed-batch fermentation factor of created gase drops to biogas fermentationInstall minimum aerogenesis standard update and add material, continue semicontinuous fed-batch fermentation.
(7) natural pond liquid refluxes: the material of adding that step (6) is changed carries out Separation of Solid and Liquid, and gained natural pond liquid is back to step(2) add preparation and the pretreatment of material.
Natural pond liquid reuse aerobic/anaerobism that the inventive method that the inventive method provides provides is coupled semicontinuous feed supplement biogas and sends outFermenting process and can effectively improve firedamp gas equipment fermentation efficiency in the technologic application of semicontinuous fed-batch fermentation. Semicontinuous fed-batch fermentationInstall in 30 days and complete the fermentation of twice single batch fermentation material, fermentation efficiency is 1.6 times of single batch fermentation.
The pretreatment of the stalk that the present invention adopts, biogas anaerobic fermentation, natural pond liquid reflux, aerobic/anaerobism is coupled semicontinuous benefitAlthough the technological means such as material be unable to do without support and the inspiration of prior art,, replace combined pretreatment thing for aerobic, anaerobismThe condition of material, the factor such as time and amount of semicontinuous fed-batch fermentation are for determining that liquid reuse aerobic/anaerobism in natural pond is coupled semicontinuousThe effect of feed supplement biogas fermentation method all has important effect, is also deciding factor, not the technological means of talkative employing andInstrument is prior art, and then negates that entirety preparation natural pond liquid reuse aerobic/anaerobism provided by the invention is coupled semicontinuous feed supplement natural pondThe novelty of gas fermentation process, existing all technological inventions and innovation all be unable to do without support and the basis of prior art. Visible, thisNatural pond liquid reuse aerobic/anaerobism that invention provides is coupled each technical factor and the technical parameter in semicontinuous feed supplement biogas fermentation methodAll pass through comprehensive consideration and design, liquid reuse aerobic/anaerobism in natural pond provided by the invention is coupled semicontinuous feed supplement biogas fermentation methodIn each sport technique segment there is upper and lower one, any technical step is indispensable, tight indivisible feature, can not approbate and reprobateDismember technical step wherein.
Embodiment bis-: ight soil-stalk mixed fermenting marsh gas and semicontinuous fed-batch fermentation technique
(1) fermentation materials preparation: selecting cow dung, jade material straw stalk in the present embodiment is biogas fermentation material, and wherein jade material straw stalk entersRow is rubbed broken processing, reaches and sways thing or stir physics and can suspend. Material proportion is pressed mass volume ratio, wherein cow dung 6%, rub brokenMaize straw 6%, mixes mutually with the backflow biogas slurry of biogas fermentation phase Separation of Solid and Liquid.
(2) fermentation materials pretreatment: by the biogas fermentation material of above-mentioned preparation, carry out the alternately pre-place of associating of aerobic, anaerobismReason. Room temperature (22 DEG C), throughput 0.1(V/Vmin), 20-30min ventilates under 100rpm stirring condition; Stop ventilation and stirMix, leave standstill; Interval 4h ventilates again, stirring operation; Material is processed 5d continuously.
(3) biogas anaerobic fermentation: taking above-mentioned pretreated material as fermentation raw material, move in 1L container, charge is for having65% of effect volume, i.e. 650ml, as for the pre-heat treatment in 32 DEG C of waters bath with thermostatic control; After material preheating, access 15%, i.e. 150ml natural pondThe solidliquid mixture of gas fermentation phase is as inoculum, airtight, carries out the fermentation of liquid phase anaerobic methane in 32 DEG C of waters bath with thermostatic control. Every dayCheckout gear gas production. This experiment parallel test 2 is installed 2, one of them for single batch fermentation, another is for semicontinuous benefitMaterial fermentation.
(4) semicontinuous fed-batch fermentation:
Carry out semicontinuous fermentation by method described in the fermentation materials preparation in the present embodiment, fermentation materials pretreatment and add materialPreparation and pretreatment, with 1L container, charge 80%, i.e. 800ml.
Determine the feed supplement operating time according to biogas fermentation factor of created gase every day testing result in the present embodiment. In the present embodiment, pressFiredamp gas equipment day, volume yield rate was dropping to 0.1(V/Vd) time start to carry out the operation of feed supplement semicontinuous fermentation. 6h before feed supplementStop stirring, the ventilation of pretreatment material, airtight, standing, and improve temperature to 28-30 DEG C.
Consubstantiality accumulated amount turnover mode, first discharging, rear feeding are pressed in feed supplement operation. First discharge charge in biogas fermentation device15% material, then equivalent adds the pretreatment material being mixed, airtight biogas fermentation device, anaerobic fermentation; Firedamp gas equipment is dischargedMaterial is added mutually and is mixed with untapped pretreatment, and continues to process by fermentation materials preprocess method. This adds materialRecycle, until biogas fermentation device anaerobic fermentation day volume yield rate is low to moderate 0.1(V/Vd) time re-use new addingMaterial carries out semicontinuous fed-batch fermentation.
After adding material and finishing using, through Separation of Solid and Liquid, natural pond liquid reuse, is reused for the pretreatment of material.
(5) measure in firedamp gas equipment anaerobic fermentation process average volume gas production every day with drainage, the solution of arranging is 33%NaCl solution.
In single batch of marsh gas fermentation processes, the variation of biogas generation is referring to shown in accompanying drawing 1; Biogas after semicontinuous fed-batch fermentationThe variation of generation is referring to shown in accompanying drawing 2. Comparative drawings figs 1 and accompanying drawing 2, aobvious in conjunction with the analysis of firedamp gas equipment factor of created gase measurement resultShow:
(1) do not carry out the single batch fermentation device of feed supplement, continuing fermentation period of 40 day, but it starts to aerogenesis peak from anaerobic fermentationRear volume yield rate continues to be down to 0.1(V/Vd) below, approximately 25 days; Common property biogas 3.59L in 25 days, average volume aerogenesisRate is 0.14(V/Vd); In 40 days, total gas production is 4.073L, and average volume factor of created gase is 0.11(V/Vd).
(2) carry out feed supplement semicontinuous fermentation device, after second aerogenesis peak of biogas anaerobic fermentation occurs, volume aerogenesisRate is low to moderate 0.1(V/Vd) start to carry out feed supplement semicontinuous fermentation, the 14th of biogas anaerobic fermentation the day; Semicontinuous fed-batch fermentationAfter, factor of created gase maintains 0.1(V/Vd) approximately 16 days; In 16 days, feed supplement gas production is 3.9L, and average volume factor of created gase is 0.24(V/Vd). In whole fermentation period 30 days, total gas production reaches 6.6L, and average volume factor of created gase is 0.22(V/Vd).
(3) single batch fermentation is compared with semicontinuous fed-batch fermentation, and semicontinuous fed-batch fermentation device completed twice list in 30 daysThe fermentation of batch fermentation material, fermentation efficiency is 1.6 times of single batch fermentation. Illustrate biogas material processing method that this fermentation provides andThe technologic application of semicontinuous fed-batch fermentation can effectively improve firedamp gas equipment fermentation efficiency.
Embodiment tri-: material pretreatment is amplified at biogas fermentation and the application of semicontinuous fed-batch fermentation
Carry out the preparation of biogas fermentation material, material pretreatment, biogas anaerobic fermentation and partly connect by method described in embodiment mono-, twoContinuous fed-batch fermentation. Institute's difference is:
One, with 10L methane fermentation vessel, charge is still controlled at 80%;
Its two, add material container with 5L, material concentration is 1.5 times of biogas fermentation material proportion, i.e. 9% cow dung, 9% cornStalk, preprocess method is identical with material preprocess method in embodiment mono-.
Its three, semicontinuous fed-batch fermentation behaviour does and middle 15% material replacing amount in embodiment mono-is adjusted into 10%.
Biogas fermentation device volume expands 10 times, adds raw material processing volume and expands 5 times, improves feed supplement material concentration simultaneously50%, biogas fermentation device through single batch fermentation and feed supplement semicontinuous fermentation effect as shown in Figure 3. Data results shows:
(1) the totally 25 days single batch fermentation stage in the present embodiment is measured, common property biogas 36.9L therebetween, average volume factor of created gase is approximately0.15(V/Vd), suitable with embodiment mono-data.
(2) biogas fermentation device starts to carry out semicontinuous material material fermentation operation after continuing to enter the low aerogenesis stage, and feed supplement is sent outFerment totally 20 days, wherein volume yield rate is at 0.1(V/Vd) more than 15 days. In 15 days, common property biogas 35.7L, on average holds aerogenesisRate 0.23(V/Vd). By the inventory in two stages, than conversion, semicontinuous fermentation stage factor of created gase is the single batch fermentation stage1.29 doubly.
Embodiment tetra-: bluish yellow storage stalk application and semicontinuous fed-batch fermentation technique
Carry out the preparation of biogas fermentation material, fermentation materials pretreatment, single batch fermentation and half by the method described in embodiment mono-, twoContinuous feeding fermentation, difference has 2 points:
One, in material preparation, stalk material is replaced by the maize straw raw material that utilizes Sativa Silage Technology preservation to process, and by itRub broken processing, reach and sway or 100rpm stirs lower physics and can suspend;
Its two, at embodiment mono-, two, in fermentation materials pretreatment, first process excrement source material material 4 days, after add again stalk thingMaterial, continues to process 1 day. Operate all the other aspects identical with embodiment mono-, two.
Utilize bluish yellow storage preservation stalk after treatment as biogas fermentation material, fermentation character test fermentation results is as accompanying drawingShown in 4. Analyzing accompanying drawing 4 and installation for fermenting gas production measurement result shows:
(1) start to fermentation gas amount continuously lower than 0.1(V/Vd from fermentation) amount to 30 days; In 30 days, total gas production is 8.9L, average volume factor of created gase reaches 0.29(V/Vd).
(2) biogas anaerobic fermentation is single batch fermentation process stage in first 14 days, the raw biogas 3.31L of common property during this time, average volumeFactor of created gase is 0.24(V/Vd); Within latter 16 days, be the feed supplement semicontinuous fermentation stage, gas production 5.59L during this time, average volume aerogenesisRate 0.34(V/Vd); Later stage, semicontinuous fed-batch fermentation stage apparatus fermentation gas efficiency was apparently higher than single batch fermentation aerogenesis rankSection.
By this embodiment, material treatment technology provided by the invention and upper in semicontinuous fed-batch fermentation technique are also describedApplication is applicable to bluish yellow storage preservation stalk raw materials after treatment.
Embodiment five: stalk and bluish yellow storage stalk are in semicontinuous fed-batch fermentation technique alternate application
Carry out the preparation of biogas fermentation material, fermentation materials pretreatment, single batch fermentation and semicontinuous by the method described in embodiment tetra-Fed-batch fermentation;
Add preparation and the pretreatment of material by method described in embodiment mono-, two semicontinuous fed-batch fermentations simultaneously.
In semicontinuous fed-batch fermentation operation, first carry out the feed supplement semicontinuous fermentation operation that stalk is added material, then carry outBluish yellow storage stalk is added the feed supplement semicontinuous fermentation operation of material. The double feed supplement semicontinuous fermentation operation of anaerobic ferment devicesResult as shown in Figure 5.
Data analysis shows:
(1) in whole sweat 50 days, total gas production is 11.57L, and average volume factor of created gase is 0.23(V/Vd).
(2) firedamp gas equipment anaerobic fermentation is the single batch fermentation stage in first 16 days, and total gas production is 3.3L, average volume aerogenesisRate 0.2(V/Vd); The 17th day to 31 days for adding the semicontinuous fermentation stage of adding material of jade material straw stalk preparation, and totally 14My god, total gas production is 3.12L, average volume factor of created gase 0.22(V/Vd), be on close level with the single batch fermentation aerogenesis stage; The32 days to the 50th day for adding the semicontinuous fermentation stage that material carries out of adding of Silage Corn Straw preparation, totally 19 days, always productTolerance is 5.15L, average volume factor of created gase 0.27(V/Vd), be 1.56 times of single batch fermentation aerogenesis stage; Semicontinuous continuouslyFed-batch fermentation operation biogas fermentation device has all kept higher aerogenesis level.
Material treatment technology provided by the invention is described and is suitable in semicontinuous fed-batch fermentation technique by the present embodimentThe semicontinuous fed-batch fermentation that firedamp gas equipment is continuous; And the stalk raw materials that is suitable for different disposal is used alternatingly.
Embodiment six: the fresh blue or green weeds material in farmland is processed and semicontinuous fed-batch fermentation
Carry out the preparation of biogas fermentation material, fermentation materials pretreatment, single batch fermentation and semicontinuous by the method described in embodiment tetra-Fed-batch fermentation; Wherein in semicontinuous fed-batch fermentation, adding material is the fresh weeds in farmland, and weeds through rubbing broken processing, reach and shake equallySwing or stirring condition under physics can suspend; Add two kinds of material preparations, one is single weeds raw material, and consumption is 12%; It two isCow dung-weeds mixture, proportioning 6% cow dung, 9% weeds; Both all pass through the material preprocess method as described in embodiment mono-, twoProcess use in 5 days.
Anaerobism single batch fermentation stage in the present embodiment, two kinds of semicontinuous fed-batch fermentation results of adding material are as accompanying drawing 6Shown in. This embodiment result shows.
(1), in the present embodiment, biogas fermentation device is through single batch fermentation stage of anaerobic methane fermentation, feed supplement for the first time and theSemicontinuous fed-batch fermentation under secondary feed supplement operation, whole detection fermentation period 35 days, total gas production 10.5L, average volume is producedGas rate 0.3(V/Vd).
(2), in the present embodiment, anaerobism list is criticized 13 days altogether biogas fermentation stage, gas production 2.95L, average volume factor of created gaseFor 0.23(V/Vd); Amount to 10 days taking single green grass as the semicontinuous fermentation stage of adding material for the first time, total gas production is3.37L, average volume factor of created gase is 0.34(V/Vd); For the second time taking ight soil-green grass as adding the semicontinuous fermentation rank of materialDuan Gongji 12 days, total gas production is 3.35L, average volume factor of created gase is 0.35(V/Vd).
By the present embodiment, material treatment technology provided by the invention and suitable equally in semicontinuous fed-batch fermentation technique is describedClose in common weeds as biogas fermentation material; Simultaneously in the present embodiment for the first time with semicontinuous fed-batch fermentation stage for the second timeMaterial preparation is all variant with concentration, also illustrates that technical method provided by the invention can add by adjusting the mode of material concentrationRegulation device factor of created gase.
Above-described embodiment is only for example of the present invention is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make on the basis of the above description other multi-form variationOr variation. Here without also giving exhaustive to all embodiments. And extended apparent variation thusOr variation is still among protection scope of the present invention.

Claims (3)

1. adopt liquid reuse aerobic/anaerobism in natural pond to be coupled a semicontinuous feed supplement biogas fermentation method, it is characterized in that concrete grammarFor:
(1) pretreatment of stalk: stalk is rubbed broken processing, broken stalk reach sway or 100rpm stir under present thingReason can suspended state;
(2) fermentation materials preparation and processing: the stalk total solid 12% of preparing by ight soil and step (1) is prepared fermentation materials,Liquid phase is backflow biogas slurry; The material preparing carries out aerobic, anaerobism replaces combined pretreatment;
(3) biogas anaerobic fermentation: biogas fermentation material prepared by step (2) carries out anaerobic fermentation in installation for fermenting, fermentationTemperature is 30~45 DEG C, produces biogas;
(4) add preparation and the pretreatment of material: add preparation and the pretreatment of material by the described method of step (2); RootAccording to fermentation demand, the concentration of adding material preparing is 1-1.5 times of Fermentable substrate material concentration;
(5) detect: detect biogas anaerobic fermentation volume yield rate every day, set the minimum aerogenesis standard of biogas fermentation device, work as natural pondWhen dropping to minimum factor of created gase standard, device of air factor of created gase carries out semicontinuous fed-batch fermentation;
(6) semicontinuous fed-batch fermentation: prepared by step (4) add, and material stops ventilation for 6 hours before use, stirs, and by itBe warming up to 28-30 DEG C; Carry out feed supplement operation by first discharging, rear feeding, turnover material equal-volume principle, and material replacing every day amountFor the 10-15% of biogas fermentation device charge, the material that firedamp gas equipment is discharged is mixed mutually with the untapped material of adding, and continuesCarry out aerobic, anaerobism and be coupled alternately combined pretreatment, recycle, until semicontinuous fed-batch fermentation factor of created gase drops to biogas fermentationInstall minimum aerogenesis standard update and add material, continue semicontinuous fed-batch fermentation;
(7) natural pond liquid refluxes: the material of adding that step (6) is changed carries out Separation of Solid and Liquid, and gained natural pond liquid is back to step (2) and entersRow is added preparation and the pretreatment of material.
2. employing as claimed in claim 1 natural pond liquid reuse aerobic/anaerobism is coupled semicontinuous feed supplement biogas fermentation method, its featureBe, described aerobic, anaerobism replaces combined pretreatment and is: material is that 22 DEG C, throughput are 0.1V/Vmin, 100 in temperatureThe 20-30min that ventilates under rpm stirring condition, stops ventilation and stirs, and leaves standstill 4h; Ventilate again, stirring operation, material connectContinuous circular treatment.
3. the employing natural pond liquid reuse aerobic/anaerobism as described in claim 1 or 2 any one is coupled semicontinuous feed supplement biogas fermentationMethod, can process the raw material such as agricultural crop straw, green grass for biogas fermentation, the fermentation such as stalk, green grass of ensiling preservation processingRaw material, and the mixture of stalk and ight soil, the mixing that realizes various materials is used.
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