CN105800897B - A method of strengthening excess sludge and stalk fast solid-state anaerobic digestion using Zero-valent Iron - Google Patents
A method of strengthening excess sludge and stalk fast solid-state anaerobic digestion using Zero-valent Iron Download PDFInfo
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- CN105800897B CN105800897B CN201610313018.6A CN201610313018A CN105800897B CN 105800897 B CN105800897 B CN 105800897B CN 201610313018 A CN201610313018 A CN 201610313018A CN 105800897 B CN105800897 B CN 105800897B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F11/00—Treatment of sludge; Devices therefor
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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
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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 kind of methods for strengthening excess sludge and stalk fast solid-state anaerobic digestion using Zero-valent Iron, it is that the ripe seed sludge of domestication and excess sludge is added in layering in anaerobic reactor, the mixture of stalk and zeroth order iron powder, sealing, which is placed in 55 DEG C of environment, cultivates, then stirring in every 5 days is primary, the anaerobic digestion duration is about 15 25 days, average methane content is 55% or so in biogas, volatile solid degradation rate is 50% 60% in excess sludge and stalk, unit VS gas production is 600mL/gVS or so, aerogenesis peak period is consistent with methane phase peak period.The present invention realizes excess sludge and agricultural straw resource and recovery energy, and it is simple, at low cost to have the advantages that anaerobic digestion starts fast, digestion process stabilization, equipment.
Description
One, technical field
The present invention relates to the processing method of sewage disposal plant excess sludge and agricultural straw resource and recovery energy,
Specifically a kind of method for strengthening excess sludge using Zero-valent Iron and agricultural crop straw solid anaerobic digestion produces biogas, belongs to
In organic waste treatment and recovery energy technical field.
Two, background technology
End the third quater end in 2015, the built urban wastewater treatment firm 3662 in the whole nation.Wastewater treatment rate is significantly
Rising causes sludge yield to increase sharply.2015, annual urban wastewater treatment firm wet mud (moisture content 80%) yield
Reach 33,590,000 tons, daily output sludge is up to 9.2 ten thousand tons.Due to containing a large amount of organic matter, nitrogen phosphorus and pathogenic microorganism etc. in sludge
Nutriment and pollutant, it is mishandling to easily cause serious secondary pollution, it reduces or offsets huge sewage disposal and throw
Provide the achievement brought.Sludge treatment has become important city and has stable political situation environment difficulties, and current main disposal options are by sanitary landfills
And sludge incineration.It fills secondary pollution or soil due to generation environment to restrict, have become increasingly limited.In excess sludge
Contain a large amount of organic matters and nutrient, it is considered to be one kind can be with regenerated resource.Anaerobic sludge digestion can produce biogas,
Sludge volume can be reduced simultaneously, and stabilized sludge property improves the dehydrating effect of sludge, reduces sludge stench, improves sludge
Hygienic quality, biogas can provide thermal energy or power generation.The marsh gas power generation that sludge of sewage treatment plant anaerobic digestion generates can meet
Itself 60% energy consumption, common hygrometric state anaerobic digestion at present, but hygrometric state digestion generates a large amount of biogas slurry, the processing of biogas slurry increases
The cost of anaerobic sludge digestion is added.High-temperature solid anaerobic digestion is with reaction volume is small, do not generate biogas slurry, kills disease in biogas residue
Pathogenic microorganism, it is heavy metal-passivated the advantages that, be the effective technology means of municipal organic garbage treatment, but exist start the time it is long,
The shortcomings of volatile fatty acid is easy accumulation, system is not sufficiently stable.
Organic matter in excess sludge mainly has microorganism group at protein content is high, and the carbon-nitrogen ratio of excess sludge is low, detests
A large amount of ammonia nitrogen is generated after oxygen processing, the generation of ammonia nitrogen can be reduced by adjusting carbon-nitrogen ratio.The phosphorus content of stalk is high, and nitrogen content is low, and
Sludge is exactly the opposite, and the two mixing can adjust carbon-nitrogen ratio, reaches in the case where addition is less or is not added with other auxiliary materials
Preferable aerogenesis effect.The degradation rate of stalk is higher when thermophilic digestion, and the addition of stalk can make sludge biogas production efficiency bright
It is aobvious to improve, gas production is dramatically increased, the biogas residue after anaerobic digestion is also used as fertilizer returning to the field.China collects stalk resource amount
About 6.87 hundred million tons, but the utilization rate of the current stalk in China only has 30%, and most stalk is discarded or is burned, and is caused serious
Environmental problem, generate haze weather.Therefore, stalk solid-state Anaerobic Digestion is having for stalk resource and recovery energy
Effect approach.
Solid-state anaerobic digestion is easy to generate the inhibition of high volatile aliphatic acid due to organic concentration height, causes longer anti-
The time should be started, the highly filled efficiency for also making electron transmission reduces.In addition, contain a large amount of air in the gap of stalk,
Oxygen therein is easy to that methanogen is caused to be poisoned, and these two aspects both increases startup time of solid-state anaerobic digestion and unstable
Property.The startup time of solid-state anaerobic digestion is reduced, the stability of solid-state anaerobic digestion is improved, solid-state anaerobism can be significantly improved and disappeared
The efficiency of change.Zero-valent Iron is easy to aoxidize, and in oxidation process, can consume the oxygen of ambient enviroment rapidly, while being capable of providing electricity
Son and quickening electron transmission, promote autotrophy methanogen and the activity of homoacetogenic bacteria and the yield of methane.Zero-valent Iron conduct
Reducing agent is reacted with toxic pollutant in sludge, reduces the toxicity of pollutant, reduces its inhibiting effect to methanogen.Cause
This, adds micro zeroth order iron powder in Solid anaerobic digestive system, can strengthen the solid-state anaerobic digestion degradation of organic matter.
In conclusion excess sludge and stalk solid-state anaerobic digestion are a kind of profits of reclaiming organic waste and energy
With method, but often has the characteristics that fluctuation of service.The present invention is realized by adding Zero-valent Iron and using stratiform inoculation technique
Quick startup, increases biogas output at stable operation, this is also the innovation place of the present invention.In addition also there is biogas residue to utilize, not produce
The advantages that raw biogas slurry and realization mud decrement.
Three, invention content
The present invention is intended to provide a kind of method for strengthening excess sludge and stalk fast solid-state anaerobic digestion using Zero-valent Iron.
By adding Zero-valent Iron, the oxygen that stalk is brought into is quickly removed, part electronics is provided, accelerates organic matter degradation and methane generated
Electron transmission in journey.It is inoculated with seed sludge by stratiform, the volatile fatty acid suppression for avoiding excess sludge rapid acidification from generating
System reduces the startup time of solid-state anaerobic digestion, improves the stability of solid-state anaerobic digestion.Pass through sludge, stalk and Zero-valent Iron
Powder mixing, stratiform inoculation seed sludge, high-temperature solid anaerobic digestion, are natural pond by excess sludge and the quick anaerobic biotransformation of stalk
Gas.
The method that the present invention strengthens excess sludge and stalk fast solid-state anaerobic digestion using Zero-valent Iron, including walk as follows
Suddenly：
1, raw material preparation：Fe is crushed, the zeroth order iron powder of 80-200 mesh is obtained, it is spare；It is obtained from sewage treatment plant
Moisture content is the excess sludge of 75-85% after dehydration, measures the content of volatile organic and nitrogen therein, spare；By stalk
1-3cm sizes are crushed to, the water that three times volume is then added into stalk impregnates 5 days, spare.
2, seed sludge culture：The common anaerobic methane production sludge for accounting for reactor volume 20% is placed in anaerobic reactor
In, the mixture of the excess sludge and the stalk after immersion that account for reactor volume 40% is added, is stirred evenly；Reactor is set
In constant incubator, temperature is increased 1 DEG C in every 3 days later, until 55 DEG C by constant temperature incubation 10 days at 35 DEG C.In culture period
Between, the mixture of the stalk after every 5 days supplement excess sludges and immersion stirs evenly, and keep reactor reaction mixture
Moisture content be 75-85%.When daily biogas output is five times or more of effecting reaction body product and maintenance 10 days or more,
Show that seed sludge domestication is completed, obtains the ripe seed sludge of domestication.
Excess sludge and the straw after immersion in the mixture of stalk after the excess sludge initially added in step 2 and immersion
The dry biomass ratio of stalk is 1:1；In the excess sludge of supplement and the mixture of the stalk after immersion excess sludge and impregnate after
Stalk dry biomass ratio be 1:1, dry biomass accounts in the excess sludge of supplement and the mixture of the stalk after immersion
The 3% of dry biomass in reactor.
3, raw material mixes：Stalk by excess sludge and after impregnating presses carbon-nitrogen ratio 25~30:1 ratio allotment, is then pressed
Zeroth order iron powder is added in the ratio of stalk dry biomass 0.01-0.1% after accounting for excess sludge and impregnating, is uniformly mixed, obtains mixed
Material is closed, is heated to 55 DEG C, it is spare.
4, raw material is inoculated with：By the seed sludge of mixture and domestication maturation after heating by way of stratiform cross arrangement
It is laid with to reactor according to the sequence of one layer of mixture, one layer of ripe seed sludge of domestication.Mixture and domestication maturation
The total volume of seed sludge accounts for the 4/5 of reactor volume, and the volume of the ripe seed sludge of domestication of laying is mixture volume
1/5~1/3, volatile solid quality and volatile solid mass ratio in mixture in the ripe seed sludge of control domestication
For 15-30：100, the moisture content of reactor reaction mixture is 75-85%.
5, solid-state anaerobic digestion：Reactor is sealed after inoculation, is heated to 55 DEG C, carries out anaerobic digestion, every 5 days
Mixed once is carried out in the case of isolation air, anaerobic digestion continues 15-25 days under the conditions of 55 DEG C, continuous to collect biogas conduct
The energy uses, and residue is for agricultural or woods after the completion of collecting digestion degradation.
Processing method concrete principle of the present invention is as follows：
Solid-state anaerobic digestion has organic concentration high, and the low feature of humidity is also easy to produce highly concentrated in anaerobic fermentation process
The volatile fatty acid of degree causes serious acid to inhibit unstable with anaerobic processes.It easily brings air during inoculation into, leads
Cause the methanogen poisoning of strictly anaerobic.Humidity is low to also reduce the speed of electron transmission during organic matter degradation and methane phase
Rate extends the processing time of Solid anaerobic digestion.By add zeroth order iron powder, consume the oxygen of ambient enviroment, provide electronics and
And accelerate electron transmission, strengthen the degradation rate of organic matter, promotes the activity of methane backeria.The stratiform of incipient stage is inoculated with, and is avoided
The accumulation for the volatile organic acids that the easily biodegradable organics fermentation of starting stage generates, accelerates opening for solid-state anaerobic digestion
It is dynamic, improve the stability and methane production of anaerobic digestion.
Compared with prior art, the advantage of the invention is that：
1, the present invention uses the powder reinforced solid-state anaerobic digestion techniques of Zero-valent Iron, quickly consumes remnant oxygen, accelerates
The electron transmission of organic matter degradation and methane generating process, this is the important foundation for improving solid-state anaerobic digestion efficiency.
2, the present invention uses stratiform inoculation technique, passes through incipient stage inoculation seed sludge, point of sludge straw mixture
Layer distribution, effectively controls the concentration of volatile fatty acid around methanogen, realizes the fast fast-growing of methanogen
It is long, avoid the inherent shortcoming that usual solid-state anaerobic digestion acid inhibits.
Four, it illustrates
Fig. 1 is the combined inoculation schematic diagram of solid-state anaerobic digestion of the present invention.
Fig. 2 is that zeroth order iron powder strengthens excess sludge and rice straw solid-state anaerobic digestion methane phase curve in embodiment 1.From
As can be seen that addition Zero-valent Iron shortens the deadtime of anaerobic digestion in Fig. 2, and increase excess sludge and the production of rice straw biogas
Rate 9% or so.
Fig. 3 is that zeroth order iron powder strengthens excess sludge and maize straw solid-state anaerobic digestion methane phase curve in embodiment 2.From
As can be seen that addition Zero-valent Iron shortens the deadtime of excess sludge and maize straw anaerobic digestion in Fig. 3, and increase remaining dirt
Mud and maize straw biogas yield 8% or so.
Five, specific implementation mode
Technical scheme of the present invention is further described below by example.
Embodiment 1：Certain sewage disposal plant excess sludge and rice straw solid-state Anaerobic Digestion
Strengthen the method for excess sludge and stalk fast solid-state anaerobic digestion in the present embodiment using Zero-valent Iron, including as follows
Step：
1, raw material preparation：Fe is crushed, the zeroth order iron powder of 120 mesh is obtained, it is spare；It obtains and is dehydrated from sewage treatment plant
The excess sludge that moisture content is 80% afterwards, measures the content of volatile organic and nitrogen therein, spare；Stalk is crushed to 1-
3cm sizes, the water that three times volume is then added into stalk impregnates 5 days, spare, and the moisture content of the stalk after immersion is 80%.
2, seed sludge culture：Common anaerobic methane production sludge is added in the reactor in constant incubator, until reaction
The 20% of body product, reactor reaction volume are 10L；Excess sludge and the leaching for accounting for reactor volume 40% are added into reactor
The mixture of stalk after bubble, stirs evenly, excess sludge and impregnate after stalk mixture in excess sludge and impregnate after
Stalk dry biomass ratio be 1:1；By reactor at 35 DEG C constant temperature incubation 10 days, every 3 days later by temperature increase 1
DEG C, until 55 DEG C, the mixture of excess sludge of every 5 days supplements and the stalk after immersion, stirs evenly in the training period, and
It is 75-85%, the mixture of the excess sludge and the stalk after immersion of supplement to keep the moisture content of reactor reaction mixture
The dry biomass ratio of stalk after middle excess sludge and immersion is 1:1, the excess sludge of supplement and the stalk after immersion it is mixed
It closes dry biomass in object and accounts for 3% of dry biomass in reactor.When daily 5 times of volumes of biogas output are in effecting reaction device
Volume and when maintaining 10 days or more, shows that seed sludge domestication is completed, obtains the ripe seed sludge of domestication.
3, raw material mixes：Stalk by excess sludge and after impregnating presses carbon-nitrogen ratio 25~30:1 ratio allotment, is then pressed
Zeroth order iron powder is added in the ratio of stalk dry biomass 0.05% after accounting for excess sludge and impregnating, is uniformly mixed, obtains mixture,
It is heated to 55 DEG C, it is spare.
4, raw material is inoculated with：By the seed sludge of mixture and domestication maturation after heating by way of stratiform cross arrangement
It is laid with to reactor according to the sequence of one layer of mixture, one layer of ripe seed sludge of domestication, four layers of mixture, domestication is ripe
Three layers of seed sludge.Mixture and the total volume of the ripe seed sludge of domestication account for the 4/5 of reactor volume, the domestication of laying
The volume of ripe seed sludge is the 1/3 of mixture volume, and volatile solid quality in ripe seed sludge is tamed in control
It is 30 with volatile solid mass ratio in mixture：100, the moisture content of reactor reaction mixture is 75-85%.
5, solid-state anaerobic digestion：Reactor is sealed after inoculation, move on to be preheated to 55 DEG C constant incubator carry out
Anaerobic digestion, during anaerobic digestion every 5 days in the case where not opening anaerobic reactor, fully rock, mix primary, detest
Oxygen digestion continues 21 days, collects biogas.The yield for obtaining methane is 520mL/g VS reaction substrates, and methane generates as shown in Figure 2.
Excess sludge reaches stabilisation after solid-state anaerobic digestion, and minimizing is innoxious, recycling.
Embodiment 2：
Strengthen the method for excess sludge and maize straw fast solid-state anaerobic digestion in the present embodiment using Zero-valent Iron, including
Following steps：
1, raw material preparation：Fe is crushed, the zeroth order iron powder of 80 mesh is obtained, it is spare；It obtains and is dehydrated from sewage treatment plant
The excess sludge that moisture content is 80% afterwards, measures the content of volatile organic and nitrogen therein, spare；By corn straw smashing
To 1-3cm sizes, the water that 4 times of volumes are then added into maize straw impregnates 5 days, spare, the moisture content of the stalk after immersion
It is 80%.
2, seed sludge culture：Common anaerobic methane production sludge is added in the reactor in constant incubator, until reaction
The 20% of body product, reactor reaction volume are 10L；Excess sludge and the leaching for accounting for reactor volume 40% are added into reactor
The mixture of maize straw after bubble, stirs evenly, excess sludge in the mixture of the maize straw after excess sludge and immersion
Dry biomass ratio with the maize straw after immersion is 1:1；By reactor at 35 DEG C constant temperature incubation 10 days, every 3 days later
Temperature is increased 1 DEG C, until 55 DEG C, supplements within every 5 days the mixed of the maize straw after an excess sludge and immersion in the training period
Object is closed, is stirred evenly, and it is 75-85%, the excess sludge of supplement and immersion to keep the moisture content of reactor reaction mixture
The dry biomass ratio of excess sludge and the maize straw after immersion is 1 in the mixture of maize straw afterwards:1, supplement remains
Dry biomass accounts for 3% of dry biomass in reactor in the mixture of maize straw after remaining sludge and immersion.When daily
5 times of volumes of biogas output in effecting reaction body product and when maintaining 10 days or more, show that seed sludge domestication is completed, tamed and dociled
It is melted into ripe seed sludge.
3, raw material mixes：Maize straw by excess sludge and after impregnating presses carbon-nitrogen ratio 25~30:1 ratio allotment, so
Zeroth order iron powder is added in the ratio of the maize straw dry biomass 0.1% after accounting for excess sludge and impregnating afterwards, is uniformly mixed, obtains
Mixture, is heated to 55 DEG C, spare.
4, raw material is inoculated with：By the seed sludge of mixture and domestication maturation after heating by way of stratiform cross arrangement
It is laid with to reactor according to the sequence of one layer of mixture, one layer of ripe seed sludge of domestication, four layers of mixture, domestication is ripe
Three layers of seed sludge.Mixture and the total volume of the ripe seed sludge of domestication account for the 4/5 of reactor volume, the domestication of laying
The volume of ripe seed sludge is the 1/4 of mixture volume, and volatile solid quality in ripe seed sludge is tamed in control
It is 20 with volatile solid mass ratio in mixture：100, the moisture content of reactor reaction mixture is 75-85%.
5, solid-state anaerobic digestion：Reactor is sealed after inoculation, move on to be preheated to 55 DEG C constant incubator carry out
Anaerobic digestion, during anaerobic digestion every 5 days in the case where not opening anaerobic reactor, fully rock, mix primary, detest
Oxygen digestion continues 21 days, collects biogas.The yield for obtaining methane is 650mL/g VS reaction substrates, and methane generates as shown in Figure 3.
Excess sludge reaches stabilisation after solid-state anaerobic digestion, and minimizing is innoxious, recycling.
Claims (5)
1. a kind of method for strengthening excess sludge and stalk fast solid-state anaerobic digestion using Zero-valent Iron, it is characterised in that including such as
Lower step：
(1) raw material preparation：Fe is crushed, the zeroth order iron powder of 80-200 mesh is obtained, it is spare；It obtains and is dehydrated from sewage treatment plant
Moisture content is the excess sludge of 75-85% afterwards, measures the content of volatile organic and nitrogen therein, spare；Stalk is crushed
To 1-3cm sizes, the water that three times volume is then added into stalk impregnates 5 days, spare；
(2) seed sludge culture：The common anaerobic methane production sludge for accounting for reactor volume 20% is placed in anaerobic reactor, then
The mixture of the excess sludge and the stalk after immersion that account for reactor volume 40% is added, stirs evenly；Reactor is placed in perseverance
In warm incubator, temperature is increased 1 DEG C in every 3 days later, until 55 DEG C by constant temperature incubation 10 days at 35 DEG C；In the training period, often
The mixture of stalk after 5 days supplement excess sludges and immersion, stirs evenly, and keep the aqueous of reactor reaction mixture
Rate is 75-85%；When daily biogas output is five times or more of effecting reaction body product and maintenance 10 days or more, show to plant
Sub- sludge acclimatization is completed, and the ripe seed sludge of domestication is obtained；
(3) raw material mixes：Stalk by excess sludge and after impregnating presses carbon-nitrogen ratio 25~30:1 ratio allotment, it is then surplus by accounting for
Zeroth order iron powder is added in the ratio of stalk dry biomass 0.01-0.1% after remaining sludge and immersion, is uniformly mixed, obtains mixture,
It is heated to 55 DEG C, it is spare；
(4) raw material is inoculated with：The seed sludge of mixture and domestication maturation after heating is pressed by way of stratiform cross arrangement
It is laid with to reactor according to the sequence of one layer of mixture, one layer of ripe seed sludge of domestication；The kind of mixture and domestication maturation
The total volume of sub- sludge accounts for the 4/5 of reactor volume；
(5) solid-state anaerobic digestion：Reactor is sealed after inoculation, is heated to 55 DEG C, carries out anaerobic digestion, every 5 days every
Mixed once is carried out in the case of exhausted air, anaerobic digestion continues 15-25 days under the conditions of 55 DEG C, and continuous biogas of collecting is as energy
Source uses, and residue is for agricultural or woods after the completion of collecting digestion degradation.
2. according to the method described in claim 1, it is characterized in that：
Excess sludge and the stalk after immersion in the mixture of stalk after the excess sludge initially added in step (2) and immersion
Dry biomass ratio be 1:1.
3. according to the method described in claim 1, it is characterized in that：
In the mixture of stalk after the excess sludge supplemented in the training period in step (2) and immersion excess sludge and impregnate after
Stalk dry biomass ratio be 1:1, dry biomass accounts in the excess sludge of supplement and the mixture of the stalk after immersion
The 3% of dry biomass in reactor.
4. according to the method described in claim 1, it is characterized in that：
The volume for the ripe seed sludge of domestication being laid in step (4) is the 1/5~1/3 of mixture volume, control domestication at
Volatile solid quality and volatile solid mass ratio in mixture are 15-30 in ripe seed sludge：100.
5. according to the method described in claim 1, it is characterized in that：
The moisture content of control reactor reaction mixture is 75-85% in step (4).
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| CN109161564A (en) * | 2018-09-03 | 2019-01-08 | 北京高能时代环境技术股份有限公司 | A kind of matrix liner and its preparation method and application for organic waste anaerobic dry fermentation |
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