CN109182387A - Anaerobic fermentation preprocess method - Google Patents
Anaerobic fermentation preprocess method Download PDFInfo
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- CN109182387A CN109182387A CN201811138587.7A CN201811138587A CN109182387A CN 109182387 A CN109182387 A CN 109182387A CN 201811138587 A CN201811138587 A CN 201811138587A CN 109182387 A CN109182387 A CN 109182387A
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- rice straw
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- 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
- C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
- C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
- C12P5/023—Methane
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- 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
- C12P2201/00—Pretreatment of cellulosic or lignocellulosic material for subsequent enzymatic treatment or hydrolysis
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- 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
- C12P2203/00—Fermentation products obtained from optionally pretreated or hydrolyzed cellulosic or lignocellulosic material as the carbon source
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- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/59—Biological synthesis; Biological purification
Abstract
Anaerobic fermentation preprocess method belongs to renewable energy development and utilization field.Include the following step: 2. rice straw carries out anaerobic fermentation into fermentor using after the processing of biogas slurry returning aeration in hydrolytic tank to rice；Sick dead pig carries out harmless treatment using High-temperature Digestion, and discharging enters homogenate pond, and after mixing with cultivation waste, preheating enters fermentor and carries out anaerobic fermentation.After the present invention carries out the processing of biogas slurry returning aeration to rice straw, rice straw is promoted sufficiently be swollen and soften, so that it is not easy to float in fermentor and is crusted, improve the methane phase rate of rice straw, and the period is short, yield is high.The present invention is using sick dead pig as raw material, and after High-temperature Digestion, methane phase ability is strong.
Description
Technical field
The invention belongs to renewable energy to develop and use field, particularly belong to the pre- of one kind of multiple raw material hybrid anaerobic fermentations
Processing method.
Background technique
As the mankind are to the pay attention to day by day of sustainable development and environment of preserving our planet, the development and utilization of biomass resource cause
Extensive concern, anaerobic fermentation generate biogas and have been to be concerned by more and more people as a kind of important channel.Biogas is organic
Substance is in anaerobic condition, and a kind of mixed gas generated by the fermentation of microorganism, in terms of handling solid waste, anaerobism is raw
Object processing technique mainly deals with objects as the easily biological-degradable raw material of high-moisture percentage, such as sewage sludge, feces of livestock and poultry.And rice
Stalk is also the main object of Anaerobic Microbiological Treatment Technology as the maximum byproduct of quantity in agricultural production.But since rice straw is by wood
The compounds such as quality, cellulose, hemicellulose, pectin and wax at, and it is light fluffy, cause in its anaerobic fermentation process often
There is the problem of floating crust, decomposition rate is slow, and the production gas period is long, and transformation efficiency is low.For a long time, people are always ceaselessly
The technological approaches for cracking above-mentioned problem, some use physical methods are explored, some uses chemical method, use biology side also
Method, but due to being restricted by economy, the above method is difficult to put into practical engineering application.As the mankind are to development and utilization biomass
The increasingly increase of energy demand, the breakthrough for how seeking the above problem have become urgent problem to be solved at one.
Summary of the invention
The purpose of the present invention is being directed to defect described above, a kind of anaerobic fermentation preprocess method is provided, this method can have
Effect solves the problems, such as the floating occurred in rice straw anaerobic fermentation process crust, accelerates decomposition rate, shortens and produces the gas period, improves biogas
Transformation efficiency.
The purpose of the present invention is what is be resolved by following technical method.
Anaerobic fermentation preprocess method, which is characterized in that include the following step:
1. 2. rice straw carries out anaerobic fermentation into fermentor using after the processing of biogas slurry returning aeration in hydrolytic tank to rice；
2. sick dead pig carries out harmless treatment using High-temperature Digestion, discharging enters homogenate pond, after being mixed with cultivation waste, preheating
Anaerobic fermentation is carried out into fermentor.
Step 1. described in biogas slurry returning aeration processing are as follows: rice straw powder particle diameter to < 20mm, aeration temperature be 35 DEG C, expose
Gas opening/closing time is 15min, and aeration air quantity is 150Nm3Air/h, pressure 500mbar.
Step 1. described in m rice straw in hydrolytic tank: biogas slurry=1 m: 9.
Step 1. described in biogas slurry returning aeration processing stir 5min, mixing speed 20rpm, Air Exposure 12 per hour
Hour.
Step 1. described in rice straw water content < 20%.
Step 2. in harmless treatment sick dead pig are as follows: around-the clock hot environment realizes inactivating pathogens, utilizes bud
Spore bacillus reduces fat enzyme, protease degradation of organic substances.
Step 2. in during harmless treatment sick dead pig sawdust additive amount be the 20% of sick dead pig weight, strain additive amount
It is the 0.2% of sick dead pig weight.
The beneficial effects of the present invention are: after 1. the present invention carries out the processing of biogas slurry returning aeration to rice straw, fiber surface structure
In part hemicellulose and neutral soluble ingredient be dissolved, and then cause the local disintegration of fibre structure, destroy rice straw structure
The package of middle lignin promotes rice straw to be sufficiently swollen and soften, and so that it is not easy floating crust in fermentor, improves rice straw
Methane phase rate, and the period is short, yield is high.2. the present invention is using sick dead pig as raw material, and after High-temperature Digestion, discharge average yield
About 72.06%, and the unit material methane production of the discharging is 277.8ml CH4/ gVS, methane phase ability are strong.3. of the invention
Method is simple, adaptable, easy to operate, has reached input concentration not less than 10% technical goal, it can be achieved that continous way, big
In batches, automated production is processed, and increases substantially the production efficiency of methane, reduces production cost, improves yield, improves economic effect
The purpose of benefit is convenient for utilization and extention.
Detailed description of the invention
Fig. 1 is fermentation materials pretreating process flow chart of the present invention.
Fig. 2 is influence diagram of the rice straw partial size of the present invention to methane phase rate.
Fig. 3 is influence diagram of the Air Exposure of the present invention to component content each in rice straw.
Fig. 4 is sick dead pig harmless treatment flow chart of the present invention.
Specific embodiment
Embodiment 1.
Anaerobic fermentation preprocess method includes the following step:
Anaerobic fermentation preprocess method, which is characterized in that include the following step:
1. 2. rice straw carries out anaerobic fermentation into fermentor using after the processing of biogas slurry returning aeration in hydrolytic tank to rice；
2. sick dead pig carries out harmless treatment using High-temperature Digestion, discharging enters homogenate pond, after being mixed with cultivation waste, preheating
Anaerobic fermentation is carried out into fermentor.
Step 1. described in biogas slurry returning aeration processing are as follows: rice straw powder particle diameter to < 20mm, aeration temperature be 35 DEG C, expose
Gas opening/closing time is 15min, and aeration air quantity is 150Nm3Air/h, pressure 500mbar.
Step 1. described in m rice straw in hydrolytic tank: biogas slurry=1 m: 9.
Step 1. described in biogas slurry returning aeration processing stir 5min, mixing speed 20rpm, Air Exposure 12 per hour
Hour.
Step 1. described in rice straw water content < 20%.
Step 2. in harmless treatment sick dead pig are as follows: around-the clock hot environment realizes inactivating pathogens, utilizes bud
Spore bacillus reduces fat enzyme, protease degradation of organic substances.
Step 2. in during harmless treatment sick dead pig sawdust additive amount be the 20% of sick dead pig weight, strain additive amount
It is the 0.2% of sick dead pig weight.
Experimental example.
The research of 1 rice straw Preprocessing Key Technique.
Rice straw is light, fluffy, surface contains wax coat, is pre-processed before anaerobic fermentation, first is that destroying lignin
Package；Second is that rice straw is promoted sufficiently to be swollen, it is made to be not easy floating crust in fermentor.Based on the above situation, the present invention is from reality
Test the two stages progress application tests in room and engineer application and technical identification.Wherein:Investigate the factors such as partial size, aeration, energy consumption
On the pretreated influence of rice straw；By engineer application, the technical study of biogas slurry reflux pretreatment rice straw is carried out.
1.1 rice straw partial sizes study influence prepared by biogas.
The analysis of the theoretical value of 1 powder particle diameter of table and energy consumption
By table 1, theoretically, Grin-ding energ7 and crushed material logarithm geometric mean particle size are mainly in conic section relationship, work as raw material
After partial size is crushed to a certain size, energy consumption is steeply risen.Therefore, based on biogas project feeding pipe, screw pump etc. to material
Demand, this experiment stress test < 20 mm and influence of the two kinds of partial sizes of < 5 mm to biogas preparative capacibility, and combine and crush test
The particle size range of the most suitable engineer application of energy consumption testing comprehensive analysis.
1.1.1 materials and methods.
(1) test material.
1. rice straw: being derived from field tested by Jiangxi Academy of Agricultural Sciences's rice.
2. inoculum: being derived from No. 1 fermentor of the town Luo Fang methane station.
The fundamental property of 2 test raw material of table
(2) test method.
1. influence of the rice straw partial size to methane phase ability.
Using Methane production potential analysis system (AMPTS II, Bioprocess), comparative analysis different-grain diameter rice straw is to production first
The influence of alkane ability.Experiment parameter:
VS inoculum: VS material=2:1；
35 DEG C of fermentation temperature；
Ferment concentration TS=6%；
Rice straw partial size: < 20 mm, < 5 mm；
Mixing parametric: 10 min, 120 rpm of revolving speed are stirred per hour；
Each experiment process sets three repetitions.
2. the Grin-ding energ7 of rice straw different-grain diameter measures.
Select the rice straw pulverizer (farsighted dragon is mechanical when Qufu, RLSJ-700,37 kw) of methane station buying (aqueous to rice straw
Amount < 12%) crushing test (sieve diameter 20 mm and 5 mm) is carried out, it measures needed for 2 kinds of particle size ranges (< 20 mm, < 5 mm)
Grin-ding energ7 and output.
1.1.2 result and analysis.
(1) influence of the powder particle diameter to rice straw methane phase ability.
Influence of the 3 rice straw different-grain diameter of table to methane production
Test result shows: partial size is smaller, and the methane production of unit material is higher (table 3), the unit methane production of small particle compared with
Coarse grain diameter improves 19.2%.The reason is that its methane phase rate (mLCH4/ h) there are notable difference (Fig. 2: the production first of preceding 160 h
Alkane rate diagram).As partial size < 5mm, the obvious two methane phase peaks (peak T 1=3h, V 1=20mL/ of peak is presented in methane phase rate
h；The peak T 2=39-70h, V 2=17-18mL/h of peak), down going channel is subsequently entered, and be gradually lower than partial size (< 20 after 100 h
Mm).As partial size 20 mm of <, only there is clearly methane phase peak (1=7 h of the peak T, 1=15 mL/ of the peak V at anaerobic fermentation initial stage
H), then since the 18th h, methane phase rate (10 mL/h) is in a kind of opposite steady state.In conclusion only from production
The angle analysis of methane characteristics, partial size (< 5 mm) is to be substantially better than < 20 mm, can be in the shorter time by Methane production potential
It releases.
The energy consumption analysis that (2) two kinds of partial sizes crush.
As known from Table 4, energy consumption needed for being crushed to (< 5 mm) is 4 times of partial size (< 20 mm), and production efficiency is about it
1/5.Through calculating, partial size (< 5 mm) rice straw per ton theoretically can fecund 66.9 m3(of biogas folding electricity be 107 degree), deduct crushing
When consume 59.5 degree more it is electric after, 47.5 degree of electricity of remainder.Although biogas volume increase can offset in full amount power consumption, it is based on grinding time
Consider with human cost, follow-up test of the present invention and engineer application use the sieve of 20 mm of aperture.
4 rice straw powder particle diameter of table and energy consumption, output test result
1.1.3 conclusion.
For rice straw, partial size is thinner, and the methane production of unit material is higher；But the energy consumption needed for crushing also is got over
It is high.In engineer application, it is also necessary to consider in conjunction with factors such as manpower, the time costs of methane station.Therefore, present invention selection < 20
The partial size of mm carries out follow-up test.
Influence of the 1.2 laboratory simulation biogas slurry Air Exposures to rice straw.
It is tested in laboratory simulation biogas Air Exposure rice straw, the factors such as integrated survey aeration, temperature pre-process rice straw
The influence of effect.
1.2.1 materials and methods.
Test raw material: a rice straw is derived from field tested by Jiangxi Academy of Agricultural Sciences's rice, and it is spare to be crushed to < 20 mm；
B biogas slurry is derived from the town Luo Fang methane station biogas slurry pond.
The fundamental property of 5 test raw material of table
(1) influence that investigation aeration and temperature factor infiltrate rice straw.
Using instruments such as water-bath, small-sized aeration pumps (yee01 type), tested in laboratory simulation rice straw Air Exposure.①
10g rice straw (1-2 cm) is weighed in 500 mL beakers, in m rice straw: m biogas slurry=1:9 ratio accesses biogas slurry, is then aerated
Processing；2. stirring 5 min(mixing speeds per hour is 20 rpm)；3. test evaluation index is settled completely with rice straw does not float on liquid
The time in face is foundation.4. each processing of this test sets three repetitions.
The design of 6 aeration test of table
(2) influence of the Air Exposure to rice straw fundamental property.
Before and after this experiment is using normal form method measurement Air Exposure, lignin, cellulose, hemicellulose and neutrality can in rice straw
The accounting changes of contents of soluble substance (protein, lipid, part carbohydrate) and the mass loss rate of rice straw.
10 g rice straws (1-2 cm) are weighed in 500 mL beakers, in m rice straw: m biogas slurry=1:9 ratio accesses biogas slurry,
Then carry out 35 DEG C of 12 h of Air Exposure.1. using the pH value of pH meter measurement aeration front and back sample；2. being exposed using gravimetric detemination
The quality of rice straw before and after gas, calculates mass loss rate；3. the percentage using each ingredient in the rice straw of normal form method measurement aeration front and back contains
Amount, and using its respective quality be radix calculating lignin, cellulose, hemicellulose, neutral solubility ingredient and ash content etc. at
The quality divided；4. each test process sets three repetitions.
1.2.2 result and analysis.
(1) influence of aeration and temperature factor to rice straw infiltration sedimentation.
7 test result of table
As known from Table 7, Air Exposure is the key factor for accelerating rice straw to infiltrate and settle, and can shorten the processing time of 5 d
To 1 d.In addition, the sinking speed of rice straw can be further speeded up by improving temperature, but at 35 DEG C or more, difference on effect is unobvious.
Because of feed needs, hydrolytic tank temperature is controlled substantially at 35 DEG C or so, so, the aeration temperature of rice straw selects 35 DEG C.
(2) influence of the Air Exposure to rice straw fundamental property.
The pH and rice straw mass change data of the aeration of table 8 front and back biogas slurry
Biogas slurry in this test is derived from sieve mill methane station, because its fermentation raw material is based on pig manure, so biogas slurry pH slightly meta-alkali
(pH=8.17 ± 0.04), after aeration, biogas slurry pH changes without conspicuousness.But the mass loss of rice straw is obvious, by 10 g before being aerated
It is reduced to 7.92 g, mass loss rate 20.8%.
Constituent analysis test (such as Fig. 3) further confirms: loss part is concentrated mainly on hemicellulose and neutral solubility
Ingredient (protein, lipid and part soluble sugar), remaining component (lignin, cellulose, ash content) is without significant change.Speculate it
The reason is that part hemicellulose and water-soluble ingredient are dissolved under the aqueous conditions of meta-alkalescence, and then cause rice straw fine
The local disintegration of structure is tieed up, this is also the main reason for rice straw is easily degraded after being aerated.
1.2.3 conclusion.
For rice straw after aeration heats processing, the part hemicellulose and neutral solubility ingredient in fiber surface structure are molten
Out, and then cause the local disintegration of fibre structure, and then promote the swelling and softening of rice straw, it is made to be not easy to float on liquid level.
The 1.3 biogas slurry aeration pretreatment rice straw technical studies based on engineer application.
The hydrolytic tank of sieve mill methane station is a cylindrical body (Φ=2.5m, H=5m) by reinforced concrete structure, is effectively held
Product about 80m3, equipped with stirring, aeration and temperature-controlling system.This experiment investigation under the conditions of 35-38 DEG C, press by specified aeration quantity and aeration
Power studies influence of the intermittent aeration to rice straw treatment effect, establishes a set of pretreated technique of suitable rice straw with this.
1.3.1 materials and methods.
Test material:
A rice straw is derived from the Jiangxi Province Xinyu City Yushui District town Luo Fang paddy field, be crushed to < 20mm is spare；
B biogas slurry is derived from the town Luo Fang methane station biogas slurry pond.
The fundamental property of 9 test raw material of table
(1) the intermittent aeration time is on the pretreated influence of rice straw.
Using Roots blower, to the rice straw in hydrolytic tank carry out intermittent aeration (aeration air quantity for 150 Nm3 air/
H, pressure are 500 mbar), using the dissolved oxygen amount of rice straw sedimentation time and hydrolysate as evaluation index, aeration time is analyzed to rice straw
The influence of pretreating effect.Aeration time is shown in Table 10.
Biogas slurry amount is added in hydrolytic tank for the first time and stalk amount is respectively 68 m3And 6t.After Air Exposure, infused using screw pump
The hydrolysis for entering 1/3 volume enters in fermentor, then according to the ratio supplement biogas slurry and rice straw added for the first time, circuit sequentially into
Row.In this test, 7 circulations of monitoring are continuously tracked in each test process.
The fundamental property of 10 test raw material of table
1.3.2 result and analysis.
The fundamental property of 11 test raw material of table
As shown in Table 11, the time that the intermittent time of aeration settles rice straw completely without conspicuousness, but to the dissolved oxygen in hydrolysate
Measure obvious effect.In biogas fermentation, the dissolved oxygen amount in material is lower, smaller to the anaerobism impact in tank, therefore, selection
Control condition of 15 min of opening/closing time as rice straw intermittent aeration.
2 sick dead pig High-temperature Digestion technical studies.
2.1 innocent treatment equipment.
The harmless treatment of sick dead pig processing broken, the heating, stirring, fermentation, baking scientific and technological using the raw environmental protection of Guangzhou Yikang
Dry integration apparatus.The equipment is based on high-temperature biological fermentation technique principle, the around-the clock high temperature ring generated using equipment
Inactivating pathogens are realized in border, and the characteristic of the lipase, protease degradation of organic substances that are decomposed using bacillus realizes animal corpse
The innoxious degradation treatment of body.Multiple synchronism links such as equipment complex cutting, rubbing, fermentation, sterilization, dry, livestock and poultry corpse etc.
The processing of waste fast degradation is Organic Ingredients, in which: the discharging of generation can be used as biogas fermentation material or organic fertilizer raw material,
The grease isolated is as iundustrial oil.
The test of 2.2 sick dead pig High-temperature Digestions.
2.2.1 test material and method.
Test material: sick dead pig is derived from the pig farm on the Jiangxi Province town Xinyu City Luo Fang periphery.
Experimental design:6 batch sick dead pigs of continuous processing, each batch sick dead pig weight about 100kg, sawdust additive amount
It is the 20% of sick dead pig weight, strain additive amount is the 0.2% of sick dead pig weight.It is surveyed using automatic Methane production potential test macro
The Methane production potential for trying sick dead pig discharging, evaluates it as the recycle value of fermentation materials using this.
The test of 12 sick dead pig High-temperature Digestion of table
As shown in Table 12, after sick dead pig High-temperature Digestion, discharging average yield is about 72.06%.In addition, the unit material of sick dead pig
Methane production is 277.8mL CH4/ g VS has certain application potential, can be used as the original of subsequent producing methane through anaerobic fermentation
Material uses.
2.2.2 the actual treatment amount of sick dead pig and operation cost analysis.
Since starting to process sick dead pig from April 27th, 2015, total harmless treatment sick dead pig 3550 is (wherein: 2015
Year processing 1581, July in January, 2016-handle 1969), total weight is about 330 tons.The processing cost of every t is about 471.08
Member.Its cost analysis is shown in Table 13.
The analysis of 13 sick dead pig processing cost of table
During the project implementation, the sick dead pig of harmless treatment is essentially big pig (60-100 kg/), and the subsidy policy of government is
80 yuan/head.Only from harmless treatment link analysis, balance between revenue and expenditure is may be implemented in the harmless processing of sick dead pig.
The theoretical com-pensation analysis and practical operation situation that 3 marsh gas power generation waste heats preheat fermentation materials.
Compensation Analysis of the present invention is analyzed only for the energy consumption compensation in fermentation process for newly preheating into material, is fermented
Start link not within consideration.
Marsh gas power generation in the present invention (generating set of 1 group of 80 kw daily work 8 h) is based on personal, wherein distinguishing: 1)
Biogas compressor in air supply system；2) charging discharging is promoted；3) hot water circulating pump；4) sick dead pig processing equipment；5) liquid fertilizer, solid
Fertile productive power；6) the daily electricity consumption of methane station.By nearly operation in 2 years and monitoring, daily generating waste-heat can be richer
Meet the preheating of fermentation materials；Even in winter, also having a small surplus.
14 marsh gas power generation waste heat Compensation Analysis of table
4 summarize.
First is that pig-breeding waste is made of excrement and breeding wastewater, need be homogenized in pond after precipitating desanding, preheating i.e.
Fermentor can be entered.
Second is that rice straw because quality compared with light, fibre structure is fine and close the features such as, cannot be used directly for anaerobic fermentation, need through
Cross crushing and immersion treatment.Test result shows: 1) factors such as integrated anaerobic methane phase ability, Grin-ding energ7 and output rate are examined
Consider, rice straw size controlling is more economical in < 20mm；2) biogas slurry reflux joint Air Exposure can quickly infiltrate rice straw interior for 24 hours,
Make its sedimentation, solves the problems such as rice straw easily floats crust in fermentor.
Third is that discharging average yield is about 72.06%, and the unit material methane phase of the discharging after sick dead pig High-temperature Digestion
Amount is 277.8mL CH4/gVS, is had as the use value for producing marsh gas raw materials.
All systems that the present invention discloses and claims, technique, method and composition can be according to disclosed by the invention
Content carries out and material row, does not need excessive test.Although system of the invention, technique, method and composition are to be preferably implemented
The form of mode is described, but those skilled in the art obviously know, without departing substantially from the concept, spirit and scope of the present invention
In the case where can be to the system, technique, method and composition and method described herein the step of or step it is suitable
Sequence is changed.It is all these it will be apparent to those skilled in the art that similar substitution or change be considered as by
Within the spirit of the disclosure defined in the appended claims, range and concept.
Wen Zhong: 1.TS: total solid concentration (unit, %)；2.VS: volatile solid object concentration (unit, %)；3. ammonia nitrogen is dense
Degree；(NH4+-N)；4. Vfa Concentration；(Volatile fatty acids, VFAs)；Bicarbonate 5. (TIC) alkali
Degree.
Claims (7)
1. anaerobic fermentation preprocess method, which is characterized in that include the following step:
1. 2. rice straw carries out anaerobic fermentation into fermentor using after the processing of biogas slurry returning aeration in hydrolytic tank to rice；
2. sick dead pig carries out harmless treatment using High-temperature Digestion, discharging enters homogenate pond, after being mixed with cultivation waste, preheating
Anaerobic fermentation is carried out into fermentor.
2. anaerobic fermentation preprocess method according to claim 1, it is characterised in that: step 1. described in biogas slurry reflux expose
Gas disposal are as follows: rice straw powder particle diameter to < 20mm, aeration temperature are 35 DEG C, and aeration opening/closing time is 15min, and aeration air quantity is
150Nm3Air/h, pressure 500mbar.
3. anaerobic fermentation preprocess method according to claim 1, it is characterised in that: step 1. described in m in hydrolytic tank
Rice straw: biogas slurry=1 m: 9.
4. anaerobic fermentation preprocess method according to claim 1, it is characterised in that: step 1. described in biogas slurry reflux expose
5min, mixing speed 20rpm are stirred in gas disposal per hour, and Air Exposure 12 hours.
5. anaerobic fermentation preprocess method according to claim 1, it is characterised in that: step 1. described in rice straw water content
< 20%.
6. anaerobic fermentation preprocess method according to claim 1, it is characterised in that: step 2. die of illness by middle harmless treatment
Pig are as follows: around-the clock hot environment realizes inactivating pathogens, is reduced fat enzyme using bacillus, and protease degradation has
Machine object.
7. anaerobic fermentation preprocess method according to claim 6, it is characterised in that: step 2. die of illness by middle harmless treatment
Sawdust additive amount is the 20% of sick dead pig weight during pig, and strain additive amount is the 0.2% of sick dead pig weight.
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