CN106676138A - Reinforced multi-raw-material two-stage fully-mixed anaerobic digestion methane production method - Google Patents
Reinforced multi-raw-material two-stage fully-mixed anaerobic digestion methane production method Download PDFInfo
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- 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
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a reinforced multi-raw-material two-stage fully-mixed anaerobic digestion methane production method which comprises the following steps: 1, putting raw materials into a mixed feeding tank after the raw materials are commonly preprocessed; 2, adjusting the solid content of mixed materials as 8 to 15% and preheating; 3, enabling digestion pulp digested and processed by a first-stage anaerobic jar to partially reflux, thermally hydrolyzing and reinforcing the digestion pulp in high temperature, then arranging the processed digestion pulp into the mixed feeding tank and arranging the residual digestion pulp into a second-stage anaerobic jar to be processed; 4, enabling digestion pulp anaerobically digested by the second-stage anaerobic jar to partially reflux, reinforcing the digestion pulp through an ozone treatment device, returning the digestion pulp to the second-stage anaerobic jar and arranging the residual digestion pulp into a digestion pulp storage tank; 5, performing solid-liquid separation, arranging biogas residues into a composting system to be treated and reusing biogas slurry or making the biogas slurry into a liquid-state fertilizer; 6, purifying the generated biogas, wherein the biogas can be used directly after being purified. The method disclosed by the invention has the advantages of improving organic matter degradation efficiency by 30% to 50% and gas generation rate by 20% to 40%, improving dewaterability of the digestion pulp, reducing the additive amount of auxiliary materials in a later biogas residue composting technology and reducing composting operation cost.
Description
Technical field
The invention belongs to organic solid castoff Anaerobic Digestion technical field, and in particular to many raw materials two of one kind reinforcing
The method of the complete mixed anaerobic digestion methane production of level.
Background technology
Because containing a large amount of organic matters, plant nutrient in organic solid castoff, while also contain pathogenic microorganism, it is easily rotten
It is rotten smelly.If dealt with improperly, biomass resource waste is not only caused, and may also result in serious secondary pollution.
Anaerobic digestion techniques have been obtained as one of the mature technology of organic solid castoff recycling treatment in China
Extremely wide application.But there is unicity in the raw material that most of large-scale anaerobic fermentations process engineering, receive certain limit
System.The digestion of many raw material mixing anaerobics is because existence material nutrient characteristic of elements is complementary, the raw material sources advantage such as extensively, progressively substitutes
Single raw material anaerobic fermentation.And many raw material anaerobic digestions are simultaneously also because material has multiformity and complexity, in anaerobic digestion
It is difficult to reach the carrying out of material synchronization aerogenesis, and then reduces the degradation efficiency and aerogenesis effect of material anaerobic digestion.Many is ground
How the person of studying carefully is more accounts for from raw material in the method for pretreatment, but ignores anaerobic digestion process and the improvement in method.
The content of the invention
The technical problem to be solved is to provide a kind of many raw material two-stages of reinforcing and mixes anaerobic digestion methane production entirely
Method, material degradation efficiency is low during overcoming traditional many raw material mixing anaerobics to digest, the low problem of factor of created gase, and improves after digestion
The dewatering of digestion slurry, reduces the addition of later stage biogas residue compost adjuvant, reduces operating cost.
The present invention solves above-mentioned technical problem with following technical scheme：
The method that many raw material two-stages of present invention reinforcing mix anaerobic digestion methane production entirely, it includes following operating procedure：
(1) by fowl and animal excrement, rice straw, excess sludge, changing food waste respectively through conventional pretreatment after, send into mixing
Feed tank mixes；
(2) adjust and be mixed into the material solid content of material pond to 8%~15%, and be preheated to 35~38 DEG C；
(3) material for being mixed into material pond is sent into into one-level anaerobic jar digestion process；
(4) the digestion slurry after one-level anaerobic jar Anaerobic Digestion, being partly refluxed to pyrohydrolysiss tank carries out high warm
Hydrolysis process, then enters back into and is mixed into material pond and mixes with raw material, remaining entrance secondary anaerobic tank digestion process；
(5) the digestion slurry after secondary anaerobic tank Anaerobic Digestion, being partly refluxed to ozone treatment apparatus is carried out by force
Change is processed, and is then return to secondary anaerobic tank, remaining to enter digestion slurry reservoir；
(6) by digestion slurry through solid-liquid separation biogas residue and biogas slurry, into compositing system process, biogas slurry is back to mixed biogas residue
Close feed tank or make liquid fertilizer；
(7) biogas that one-level anaerobic jar and secondary anaerobic tank are produced can be used after methane purification system purification.
In step (1), fowl and animal excrement, rice straw, excess sludge, changing food waste are by dry solid content TS ratios：Manure of livestock and poultry
Just：Rice straw：Changing food waste：Excess sludge=1：3：0.25~1：0.25~1.
In step (1), the indirect steam outlet of material pond connection pyrohydrolysiss tank is mixed into, residence time of material is 4h~12h.
The digestion process condition of the one-level anaerobic jar is：Digestion temperature is 37 ± 1 DEG C, and hydraulic detention time is 8~15
My god.
The treatment conditions of the pyrohydrolysiss tank are：Pressure is 0.80~1.95Mpa, and reaction temperature is 170 DEG C~210 DEG C,
Process 15~90min of response time.
The digestion process condition of the secondary anaerobic tank is：Digestion temperature is room temperature, and hydraulic detention time is 5~12 days.
In step (5), the intensive treatment time of ozone treatment apparatus is 10~50min, and dosage is 0.02~0.08g-
O3/ g-TS, material is passed through formation eddy flow hydraulic mixing in secondary anaerobic pot bottom using multiple spot after intensive treatment.
The digestion slurry reflux ratio of the one-level anaerobic jar and secondary anaerobic tank is 1:10~1:2.
In step (6), solid-liquid separation is separated using filter press, is separated biogas residue moisture content and is reached less than 50%, compost
System is dynamic good oxygen compartment type compost treatment, and process time is 10~15 days.
The inventive method has the advantages that：
1. the digestion of the mixing anaerobic of raw material more than is capable of achieving the complementation of material nutrient characteristic, subtracts with respect to single material anaerobic digestion
The input of few adjuvant, reduces operating cost.
2. the garbage of raw material more than mixes Anaerobic Digestion entirely using two-stage, and classification reinforcing, one-level anaerobic digestion passes through material
Backflow pyrohydrolysiss intensive treatment, secondary anaerobic digestion pass through the ozone-enhanced process of feed back, when making mixed material anaerobic digestion
The organic matter degradation efficiency of mixed material improves 30%~50%, and factor of created gase improves 20%~40%.
3. the high temperature thermal material after pyrohydrolysiss are processed be not required to heat exchange cooling directly be mixed into material pond raw material and mix, improve and mix
The mobility of mixed material is increased while closing temperature of charge, and then improves the charging solid content of mixed material, and reduce heat
The loss of energy.
4. material improves the dewatering of follow-up digestion slurry, effectively after classification reinforcing two-stage anaerobic digestion is processed
The addition of biogas residue compost adjuvant is reduced, compost operating cost is reduced.
Description of the drawings
Fig. 1 is the process chart of the method that many raw material two-stages of present invention reinforcing mix anaerobic digestion methane production entirely.
Specific embodiment
Accompanying drawings below and embodiment are further described to the inventive method：
As shown in figure 1, the concrete operation step of the inventive method is：
(1) by fowl and animal excrement, rice straw, excess sludge, changing food waste respectively through conventional pretreatment after, send into mixing
Feed tank mixes；Wherein, fowl and animal excrement, rice straw, excess sludge, changing food waste are by dry solid content TS ratios：Fowl and animal excrement：
Rice straw：Changing food waste：Excess sludge=1：3：0.25~1：0.25~1；
(2) bottom for being mixed into material pond is provided with the steam(-)coil being connected with the indirect steam outlet of pyrohydrolysiss tank, heat
The material outlet connection of hydrolytic decomposition pot is mixed into material pond, will enter the material that is mixed into material pond and adjusts solid content to 8%~15%, thing
The material time of staying is 4h~12h, and material is preheated to into 35~38 DEG C by indirect steam；
(3) material for being mixed into material pond is sent into and arrange in one-level anaerobic jar digestion process, one-level anaerobic jar multilamellar machinery
Stir, its digestion process condition is：Digestion temperature is 37 ± 1 DEG C, and hydraulic detention time is 8~15 days；
(4) the digestion slurry after one-level anaerobic jar Anaerobic Digestion, being partly refluxed to pyrohydrolysiss tank carries out high warm
Hydrolysis process, enters back into and is mixed into material pond and mixes with raw material, remaining entrance secondary anaerobic tank digestion process；The pyrohydrolysiss tank
Treatment conditions be：Pressure is 0.80~1.95Mpa, and reaction temperature is 170 DEG C~210 DEG C, the process response time 15~
90min；
(5) the digestion slurry after secondary anaerobic tank Anaerobic Digestion, being partly refluxed to ozone treatment apparatus is carried out by force
Change is processed, and is then return to secondary anaerobic tank, remaining to enter digestion slurry reservoir；The digestion process condition of the secondary anaerobic tank
For：Digestion temperature is room temperature, and hydraulic detention time is 5~12 days；The intensive treatment time of the ozone treatment apparatus be 10~
50min, dosage is 0.02~0.08g-O3/ g-TS, material is passed through in secondary anaerobic pot bottom using multiple spot after intensive treatment
Form eddy flow hydraulic mixing.
(6) by digestion slurry through solid-liquid separation biogas residue and biogas slurry, into compositing system process, biogas slurry is back to mixed biogas residue
Close feed tank or make liquid fertilizer；The solid-liquid separation is separated using filter press, separates biogas residue moisture content below 50%, heap
Fertile system is dynamic good oxygen compartment type compost treatment, and process time is 10~15 days.
(7) biogas that one-level anaerobic jar and secondary anaerobic tank are produced sends into methane voltage-stabilizing cabinet, then through methane purification system
It is used for gas combustion automobile or steam boiler after purification.
The digestion slurry reflux ratio of one-level anaerobic jar of the present invention and secondary anaerobic tank is 1:10~1:2.
The following is the specific embodiment of the inventive method：
Embodiment 1
By fowl and animal excrement, rice straw, excess sludge, changing food waste respectively through conventional pretreatment, wherein fowl and animal excrement
Homogenate desanding is carried out, rice straw carries out being crushed to below 1cm, and excess sludge carries out homogenate desanding, and changing food waste carries out machinery
Sorting, oil removing, crushing are sized mixing, and fowl and animal excrement, rice straw, excess sludge, changing food waste are pressed into dry solid content TS after pretreatment
Than for：Fowl and animal excrement：Rice straw：Excess sludge：Changing food waste=1：3：0.25：0.25 sends into feed tank mixing, uses back
It is 8% that stream biogas slurry adjusts the solid content of mixed material, and the indirect steam produced with pyrohydrolysiss operation is by being mixed into the steaming of material pond
Vapour heating coil is preheated to mixed material, and is mixed with the high-temperature material from pyrohydrolysiss, makes total mixture material preheating temperature
Degree reaches 35 DEG C, and the whole material mixing preheating time of staying is 4h；Mixed material is sent into by one-level anaerobic jar, control by screw pump
Anaerobic digestion reaction temperature processed is 37 ± 1 DEG C, and hydraulic detention time is 8 days, and one-level anaerobic jar discharging digestion slurry presses 1:10 backflows
To pyrohydrolysiss tank, mixed feeding pond, remaining digestion are entered after intensive treatment 15min at pressure 0.80Mpa, 170 DEG C of temperature
Slurry enters secondary anaerobic tank anaerobic digestion, and digestion condition is room temperature, and hydraulic detention time is 5 days.The discharging digestion of secondary anaerobic tank
Slurry presses 1:10 are back to ozone treatment apparatus carries out intensive treatment, and treatment conditions are process time 10min, and ozone dosage is
0.02g-O3/ g-TS, material is passed through formation eddy flow hydraulic mixing in secondary anaerobic pot bottom using multiple spot after process, remaining to disappear
Slurrying then enters digestion slurry reservoir, will be digested after slurry is dehydrated by filter press, and into compositing system aerobic heap is carried out
Fertilizer is processed 10~15 days.The biogas that anaerobic jar is produced is used for gas combustion automobile or steam kettle after then withdrawing deposit system purification into biogas
Stove.
Mixed material is processed through the inventive method stable operation, and organic matter degradation rate is 62.3%, and factor of created gase is
423m3/ t-TS, dehydration biogas residue moisture content is less than 50%.
Comparative example 1
By fowl and animal excrement, rice straw, excess sludge, changing food waste respectively through conventional pretreatment, wherein fowl and animal excrement
Homogenate desanding is carried out, rice straw carries out being crushed to below 1cm, and excess sludge carries out homogenate desanding, and changing food waste carries out machinery
Sorting, oil removing, crushing are sized mixing, and fowl and animal excrement, rice straw, excess sludge, changing food waste are pressed into dry solid content TS after pretreatment
Than for：Fowl and animal excrement：Rice straw：Excess sludge：Changing food waste=1：3：0.25：0.25 feeding is mixed into material pond mixing, makes
The solid content for adjusting mixed material with backflow biogas slurry is 8%, with primary steam by being mixed into the steam(-)coil pair of material pond
Mixed material is preheated, and makes mixed material preheating temperature reach 35 DEG C, and the whole material mixing preheating time of staying is 4h；Pass through
Mixed material is sent into one-level anaerobic jar by screw pump, controls anaerobic digestion reaction temperature for 37 ± 1 DEG C, and hydraulic detention time is 8
My god, the digestion slurry after the process of one-level anaerobic jar enters secondary anaerobic tank anaerobic digestion, and digestion condition is room temperature, hydraulic retention
Time is 5 days.Digestion slurry after the process of secondary anaerobic tank then enters digestion slurry reservoir, and slurry will be digested by filter press
After being dehydrated, carry out aerobic compost into compositing system and process 10~15 days.The biogas that anaerobic jar is produced then is carried into biogas
For gas combustion automobile or steam boiler after deposit system purification.
Mixed material is processed through the said method stable operation, and organic matter degradation rate is 47.5%, and factor of created gase is
346m3/ t-TS, dehydration biogas residue moisture content is less than 60%.
As can be seen here, embodiment 1 mixes anaerobism entirely using many raw material two-stages of high-temperature-hot-water solution combined with ozone classification backflow reinforcing
The method of digestion, the relatively method of example 1, organic matter degradation rate improves 31.16%, and factor of created gase improves 22.25%, natural pond
Slag dewatering is effectively improved.
Embodiment 2
By fowl and animal excrement, rice straw, excess sludge, changing food waste respectively through conventional pretreatment, wherein fowl and animal excrement
Homogenate desanding is carried out, rice straw carries out being crushed to below 1cm, and excess sludge carries out homogenate desanding, and changing food waste carries out machinery
Sorting, oil removing, crushing are sized mixing, and fowl and animal excrement, rice straw, excess sludge, changing food waste are pressed into dry solid content TS after pretreatment
Than for：Fowl and animal excrement：Rice straw：Excess sludge：Changing food waste=1：3：0.25：0.25 sends into feed tank mixing, uses back
It is 10% that stream biogas slurry adjusts the solid content of mixed material, and the indirect steam produced with pyrohydrolysiss operation is by being mixed into the steaming of material pond
Vapour heating coil is preheated to mixed material, and is mixed with the high-temperature material from pyrohydrolysiss, makes total mixture material preheating temperature
Degree reaches 36 DEG C, and the whole material mixing preheating time of staying is 8h；Mixed material is sent into by one-level anaerobic jar, control by screw pump
Anaerobic digestion reaction temperature processed is 37 ± 1 DEG C, and hydraulic detention time is 14 days, and one-level anaerobic jar discharging digestion slurry presses 1:5 backflows
To pyrohydrolysiss tank, mixed feeding pond, remaining digestion are entered after intensive treatment 30min at pressure 1.27Mpa, 190 DEG C of temperature
Slurry enters secondary anaerobic tank anaerobic digestion, and digestion condition is room temperature, and hydraulic detention time is 11 days.The discharging digestion of secondary anaerobic tank
Slurry presses 1:5 are back to ozone treatment apparatus carries out intensive treatment, and treatment conditions are process time 20min, and ozone dosage is
0.03g-O3/ g-TS, material is passed through formation eddy flow hydraulic mixing in secondary anaerobic pot bottom using multiple spot after process, remaining to disappear
Slurrying then enters digestion slurry reservoir, will be digested after slurry is dehydrated by filter press, and into compositing system aerobic heap is carried out
Fertilizer is processed 10~15 days.The biogas that anaerobic jar is produced is used for gas combustion automobile or steam kettle after then withdrawing deposit system purification into biogas
Stove.
Mixed material is processed through the inventive method stable operation, and organic matter degradation rate is 60.3%, and factor of created gase is
420m3/ t-TS, dehydration biogas residue moisture content is less than 50%.
Comparative example 2
By fowl and animal excrement, rice straw, excess sludge, changing food waste respectively through conventional pretreatment, wherein fowl and animal excrement
Homogenate desanding is carried out, rice straw carries out being crushed to below 1cm, and excess sludge carries out homogenate desanding, and changing food waste carries out machinery
Sorting, oil removing, crushing are sized mixing, and fowl and animal excrement, rice straw, excess sludge, changing food waste are pressed into dry solid content TS after pretreatment
Than for：Fowl and animal excrement：Rice straw：Excess sludge：Changing food waste=1：3：0.25：0.25 feeding is mixed into material pond mixing, makes
The solid content for adjusting mixed material with backflow biogas slurry is 10%, with primary steam by being mixed into the steam(-)coil pair of material pond
Mixed material is preheated, and makes mixed material preheating temperature reach 36 DEG C, and the whole material mixing preheating time of staying is 8h；Pass through
Mixed material is sent into one-level anaerobic jar by screw pump, controls anaerobic digestion reaction temperature for 37 ± 1 DEG C, and hydraulic detention time is 14
My god, the digestion slurry after the process of one-level anaerobic jar enters secondary anaerobic tank anaerobic digestion, and digestion condition is room temperature, hydraulic retention
Time is 11 days.Digestion slurry after the process of secondary anaerobic tank then enters digestion slurry reservoir, will be digested by filter press
After slurry is dehydrated, carries out aerobic compost into compositing system and process 10~15 days.The biogas that anaerobic jar is produced then enters biogas
For gas combustion automobile or steam boiler after system of withdrawing deposit purification.
Mixed material is processed through the method stable operation, and organic matter degradation rate is 45.5%, and factor of created gase is 333m3/t-
TS, dehydration biogas residue moisture content is less than 60%.
As can be seen here, embodiment 2 mixes anaerobism entirely using many raw material two-stages of high-temperature-hot-water solution combined with ozone classification backflow reinforcing
The method of digestion, the relatively method of example 2, organic matter degradation rate improves 32.53%, and factor of created gase improves 26.13%, natural pond
Slag dewatering is effectively improved.
Embodiment 3
By fowl and animal excrement, rice straw, excess sludge, changing food waste respectively through conventional pretreatment, wherein fowl and animal excrement
Homogenate desanding is carried out, rice straw carries out being crushed to below 1cm, and excess sludge carries out homogenate desanding, and changing food waste carries out machinery
Sorting, oil removing, crushing are sized mixing, and fowl and animal excrement, rice straw, excess sludge, changing food waste are pressed into dry solid content TS after pretreatment
Than for：Fowl and animal excrement：Rice straw：Excess sludge：Changing food waste=1：3：0.5：0.5, into material pond mixing is mixed into, uses
It is 12% that backflow biogas slurry adjusts the solid content of mixed material, with the indirect steam of pyrohydrolysiss operation generation by being mixed into material pond
Steam(-)coil is preheated to mixed material, and is mixed with the high-temperature material from pyrohydrolysiss, preheats total mixture material
Temperature reaches 36 DEG C, and the whole material mixing preheating time of staying is 8h；Mixed material is sent into by one-level anaerobic jar by screw pump,
Anaerobic digestion reaction temperature is controlled for 37 ± 1 DEG C, hydraulic detention time is 15 days, one-level anaerobic jar discharging digestion slurry presses 1:5 times
Pyrohydrolysiss tank is flow to, mixed feeding pond is entered after intensive treatment 40min at pressure 1.27Mpa, 190 DEG C of temperature, be left digestion
Slurry enters secondary anaerobic tank anaerobic digestion, and digestion condition is room temperature, and hydraulic detention time is 12 days.The discharging digestion of secondary anaerobic tank
Slurry presses 1:5 are back to ozone treatment apparatus carries out intensive treatment, and treatment conditions are process time 30min, and ozone dosage is
0.05g-O3/ g-TS, material is passed through formation eddy flow hydraulic mixing in secondary anaerobic pot bottom using multiple spot after process, is left digestion
Slurry then enters digestion slurry reservoir, by filter press will digest slurry carry out it is de- after, carry out at aerobic compost into compositing system
Reason 10~15 days.The biogas that anaerobic jar is produced is used for gas combustion automobile or steam boiler after then withdrawing deposit system purification into biogas.
Mixed material is processed through the inventive method stable operation, and organic matter degradation rate is 61.5%, and factor of created gase is
426m3/ t-TS, dehydration biogas residue moisture content is less than 50%.
Comparative example 3
By fowl and animal excrement, rice straw, excess sludge, changing food waste respectively through conventional pretreatment, wherein fowl and animal excrement
Homogenate desanding is carried out, rice straw carries out being crushed to below 1cm, and excess sludge carries out homogenate desanding, and changing food waste carries out machinery
Sorting, oil removing, crushing are sized mixing, and fowl and animal excrement, rice straw, excess sludge, changing food waste are pressed into dry solid content TS after pretreatment
Than for：Fowl and animal excrement：Rice straw：Excess sludge：Changing food waste=1：3：0.5：0.5 feeding is mixed into material pond mixing, uses
It is 12% that backflow biogas slurry adjusts the solid content of mixed material, with primary steam by being mixed into the steam(-)coil of material pond to mixed
Compound material is preheated, and makes mixed material preheating temperature reach 36 DEG C, and the whole material mixing preheating time of staying is 8h；By spiral shell
Mixed material is sent into one-level anaerobic jar by bar pump, controls anaerobic digestion reaction temperature for 37 ± 1 DEG C, and hydraulic detention time is 15
My god, the digestion slurry after the process of one-level anaerobic jar enters secondary anaerobic tank anaerobic digestion, and digestion condition is room temperature, hydraulic retention
Time is 12 days.Digestion slurry after the process of secondary anaerobic tank then enters digestion slurry reservoir, will be digested by filter press
After slurry is dehydrated, carries out aerobic compost into compositing system and process 10~15 days.The biogas that anaerobic jar is produced then enters biogas
For gas combustion automobile or steam boiler after system of withdrawing deposit purification.
Mixed material is processed through the method stable operation, and organic matter degradation rate is 46.0%, and factor of created gase is 340m3/t-
TS, dehydration biogas residue moisture content is less than 60%.
As can be seen here, embodiment 3 mixes anaerobism entirely using many raw material two-stages of high-temperature-hot-water solution combined with ozone classification backflow reinforcing
The method of digestion, the relatively method of example 3, organic matter degradation rate improves 33.70%, and factor of created gase improves 25.29%, natural pond
Slag dewatering is effectively improved.
Embodiment 4
By fowl and animal excrement, rice straw, excess sludge, changing food waste respectively through conventional pretreatment, wherein fowl and animal excrement
Homogenate desanding is carried out, rice straw carries out being crushed to below 1cm, and excess sludge carries out homogenate desanding, and changing food waste carries out machinery
Sorting, oil removing, crushing are sized mixing, and fowl and animal excrement, rice straw, excess sludge, changing food waste are pressed into dry solid content TS after pretreatment
Than for：Fowl and animal excrement：Rice straw：Excess sludge：Changing food waste=1：3：1：1 sends into feed tank mixing, using backflow biogas slurry
The solid content for adjusting mixed material is 15%, and the indirect steam produced with pyrohydrolysiss operation is heated by being mixed into the steam of material pond
Coil pipe is preheated to mixed material, and is mixed with the high-temperature material from pyrohydrolysiss, reaches total mixture material preheating temperature
38 DEG C, the whole material mixing preheating time of staying is 12h；Mixed material is sent into by one-level anaerobic jar by screw pump, control is detested
Oxygen digestion reaction temperature is 37 ± 1 DEG C, and hydraulic detention time is 15 days, and one-level anaerobic jar discharging digestion slurry presses 1:2 are back to heat
Hydrolytic decomposition pot, after intensive treatment 90min at pressure 1.95Mpa, 210 DEG C of temperature enter mixed feeding pond, remaining digestion starch into
Enter secondary anaerobic tank anaerobic digestion, digestion condition is room temperature, and hydraulic detention time is 12 days.Secondary anaerobic tank discharging digestion slurry is pressed
1:2 are back to ozone treatment apparatus carries out intensive treatment, and treatment conditions are process time 50min, and ozone dosage is 0.08g-
O3/ g-TS, material is passed through formation eddy flow hydraulic mixing in secondary anaerobic pot bottom using multiple spot after process, and remaining digestion is starched then
Into digestion slurry reservoir, will be digested after slurry is dehydrated by filter press, into compositing system aerobic compost process will be carried out
10~15 days.The biogas that anaerobic jar is produced is used for gas combustion automobile or steam boiler after then withdrawing deposit system purification into biogas.
Mixed material is processed through the inventive method stable operation, and organic matter degradation rate is 58.6%, and factor of created gase is
401m3/ t-TS, dehydration biogas residue moisture content is less than 50%.
Comparative example 4
By fowl and animal excrement, rice straw, excess sludge, changing food waste respectively through conventional pretreatment, wherein fowl and animal excrement
Homogenate desanding is carried out, rice straw carries out being crushed to below 1cm, and excess sludge carries out homogenate desanding, and changing food waste carries out machinery
Sorting, oil removing, crushing are sized mixing, and fowl and animal excrement, rice straw, excess sludge, changing food waste are pressed into dry solid content TS after pretreatment
Than for：Fowl and animal excrement：Rice straw：Excess sludge：Changing food waste=1：3：1：1 feeding is mixed into material pond mixing, using backflow
It is 15% that biogas slurry adjusts the solid content of mixed material, with primary steam by being mixed into the steam(-)coil of material pond to mixture
Material is preheated, and makes mixed material preheating temperature reach 38 DEG C, and the whole material mixing preheating time of staying is 12h；By screw rod
Mixed material is sent into one-level anaerobic jar by pump, controls anaerobic digestion reaction temperature for 37 ± 1 DEG C, and hydraulic detention time is 15 days,
Digestion slurry after the process of one-level anaerobic jar enters secondary anaerobic tank anaerobic digestion, and digestion condition is room temperature, during hydraulic retention
Between be 12 days.Digestion slurry after the process of secondary anaerobic tank then enters digestion slurry reservoir, and slurry will be digested by filter press
After being dehydrated, carry out aerobic compost into compositing system and process 10~15 days.The biogas that anaerobic jar is produced then is carried into biogas
For gas combustion automobile or steam boiler after deposit system purification.
Mixed material is processed through the method stable operation, and organic matter degradation rate is 39.2%, and factor of created gase is 289m3/t-
TS, dehydration biogas residue moisture content is less than 60%.
As can be seen here, embodiment 4 mixes anaerobism entirely using many raw material two-stages of high-temperature-hot-water solution combined with ozone classification backflow reinforcing
The method of digestion, the relatively method of example 4, organic matter degradation rate improves 49.49%, and factor of created gase improves 38.75%, natural pond
Slag dewatering is effectively improved.
Claims (9)
1. the method that many raw material two-stages mix anaerobic digestion methane production entirely is strengthened, it is characterised in that it includes following operating procedure：
(1) by fowl and animal excrement, rice straw, excess sludge, changing food waste respectively through conventional pretreatment after, send into mixed feeding
Pond mixes；
(2) adjust and be mixed into the material solid content of material pond to 8%~15%, and be preheated to 35~38 DEG C；
(3) material for being mixed into material pond is sent into into one-level anaerobic jar digestion process；
(4) the digestion slurry after one-level anaerobic jar Anaerobic Digestion, being partly refluxed to pyrohydrolysiss tank carries out high-temperature-hot-water solution
Process, then enter back into and be mixed into material pond and mix with raw material, remaining entrance secondary anaerobic tank digestion process；
(5) the digestion slurry after secondary anaerobic tank Anaerobic Digestion, being partly refluxed to ozone treatment apparatus is carried out at reinforcing
Reason, is then return to secondary anaerobic tank, remaining to enter digestion slurry reservoir；
(6) by digestion slurry through solid-liquid separation biogas residue and biogas slurry, biogas residue is back to and is mixed into into compositing system process, biogas slurry
Material pond makes liquid fertilizer；
(7) biogas that one-level anaerobic jar and secondary anaerobic tank are produced can be used after methane purification system purification.
2. the method that many raw material two-stages mix anaerobic digestion methane production entirely is strengthened according to claim 1, it is characterised in that step
(1) in, fowl and animal excrement, rice straw, excess sludge, changing food waste are by dry solid content TS ratios：Fowl and animal excrement：Rice straw：
Changing food waste：Excess sludge=1：3：0.25~1：0.25~1.
3. the method that many raw material two-stages mix anaerobic digestion methane production entirely is strengthened according to claim 1, it is characterised in that step
(1) in, the indirect steam outlet of material pond connection pyrohydrolysiss tank is mixed into, residence time of material is 4h~12h.
4. the method that many raw material two-stages mix anaerobic digestion methane production entirely is strengthened according to claim 1, it is characterised in that one-level
The digestion process condition of anaerobic jar is：Digestion temperature is 37 ± 1 DEG C, and hydraulic detention time is 8~15 days.
5. the method that many raw material two-stages mix anaerobic digestion methane production entirely is strengthened according to claim 1, it is characterised in that hot water
Solution tank treatment conditions be：Pressure is 0.80~1.95Mpa, and reaction temperature is 170 DEG C~210 DEG C, the process response time 15~
90min。
6. the method that many raw material two-stages mix anaerobic digestion methane production entirely is strengthened according to claim 1, it is characterised in that two grades
The digestion process condition of anaerobic jar is：Digestion temperature is room temperature, and hydraulic detention time is 5~12 days.
7. the method that many raw material two-stages mix anaerobic digestion methane production entirely is strengthened according to claim 1, it is characterised in that step
(5) in, the intensive treatment time of ozone treatment apparatus is 10~50min, and dosage is 0.02~0.08g-O3/ g-TS, reinforcing
Material is passed through formation eddy flow hydraulic mixing in secondary anaerobic pot bottom using multiple spot after process.
8. the method that many raw material two-stages mix anaerobic digestion methane production entirely is strengthened according to claim 1, it is characterised in that one-level
The digestion slurry reflux ratio of anaerobic jar and secondary anaerobic tank is 1:10~1:2.
9. the method that many raw material two-stages mix anaerobic digestion methane production entirely is strengthened according to claim 1, it is characterised in that step
(6) in, solid-liquid separation is separated using filter press, is separated biogas residue moisture content and is reached less than 50%, and compositing system is good for dynamic
Oxygen compartment type compost treatment, process time is 10~15 days.
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