CN107352769A - A kind of municipal sludge anaerobic digestion device and technique based on ethanol-type fermentation pretreatment - Google Patents
A kind of municipal sludge anaerobic digestion device and technique based on ethanol-type fermentation pretreatment Download PDFInfo
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- CN107352769A CN107352769A CN201710812024.0A CN201710812024A CN107352769A CN 107352769 A CN107352769 A CN 107352769A CN 201710812024 A CN201710812024 A CN 201710812024A CN 107352769 A CN107352769 A CN 107352769A
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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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
- C02F11/00—Treatment of sludge; Devices therefor
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/001—Runoff or storm water
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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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
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
Abstract
A kind of diphasic anaerobic processing unit and technique that direct inter-species electron transmission is built based on ethanol-type fermentation, it comprises the following steps：It is respectively adopted and is thoroughly mixed formula anaeroic digestor and upflow anaerobic sludge blanket reactor as acidifying phase and methanogenic phase.Control respectively and be acidified the mutually hydraulic detention time with methanogenic phase, pH and temperature in device.The fermentation pH that 2 4mol/L HCI solution adjusts acidifying phase is used to run the technique for 4.0 4.5.The present invention can reach following effect：Improve the content of ethanol in acidizing product.The abundance of ground bacillus in methanogenic phase granule sludge is improved, promotes it to build direct inter-species electron transmission with methanogen.Accelerate the decomposition rate of organic acid and alcohols material in methanogenic phase, alleviate because high organic loading causes the acid accumulation of methanogenic phase and syntrophism metabolic stasis, improve methane phase efficiency.The technological investment cost is few, simple to operate, improves positive effect, can be applied to upgrading of the existing diphasic anaerobic technique for the waste water impact of resistance high load capacity.
Description
The present invention relates to environmental protection industry for technical field.
Background technology is increasing with municipal sewage plant, and municipal sludge is due to huge containing high organic, yield
Greatly, the features such as unstable, a kind of environmental hazard waste of extensive concern is had become.Anaerobic digestion is current disposal municipal sludge
One of most real, most efficient method.Main reason is that, on the one hand, anaerobic digestion has the characteristics that load is high, energy consumption is small,
Theoretically handle the prefered method of high organic waste；On the other hand, during municipal sludge is disposed, anaerobic digestion is not only
It can reduce sludge volume (sludge reduction), kill parasitic ovum and virus, additionally it is possible to by most of organic matter transformation be first
Alkane, so as to realize pollutant energy.
However, municipal sludge anaerobic digestion techniques still face two hang-ups at present, it is limited in practical engineering application
Efficiency.First, relatively slow sludge hydrolytic broken wall process.This is due to thin containing substantial amounts of activated sludge in municipal sludge
Born of the same parents, abundant intracellular polymer (IPS), such as glucide, protein, organic acid are wrapped in it, is anaerobic methane
Important substrate.Activated sludge cell membrane is mainly made up of phospholipid layer and polypeptide chain, and it is difficult to fill to rely solely on anaerobic fermentation microorganism
Divide ground to destroy activated sludge cell membrane, discharge intracellular polymer, and then limit municipal sludge minimizing and methane phase efficiency.Two
It is relatively low to introduce a fine variety sludge activity.In municipal sludge anaerobic digestion process, it is generally relatively low initially to introduce a fine variety sludge activity, this
It is mainly due to compared with municipal sludge and introduces a fine variety the dosing ratio between sludge.If reducing the ratio, it is dirty that whole municipal administration can be reduced
The disposal ability of mud anaerobic digestion.And in higher municipal sludge and under introducing a fine variety sludge dosing ratio, fermentative microorganism (or production acid
Bacterium) bioelectronics between methanogen links (be typically inter-species hydrogen transmission [IHT]) and typically sets up slowly, easily cause
Anaerobic sludge digestion methanation at initial stage is stagnated, and causes methane phase less efficient.
Direct inter-species electron transmission (DIET) is considered as electricity between a kind of microbial species that can substitute inter-species hydrogen transmission
Son and the new model of energy exchange.Compared to inter-species hydrogen transmission (IHT), ground bacillus (Geobacter) relies on extracellular conductive bacterium
The bioelectronics that silk (pili) and cytochromes are formed with methanogen is linked and more quickly can established in anaerobic system, is carried
High methane phase efficiency.However, abundance of the ground bacillus in municipal sludge anaeroic digestor is generally relatively low, and then limit direct kind
Between electron transmission for improve municipal sludge anaerobic methane production effect.There are some researches show detest using ethanol domestication is conventional recently
Oxygen digester, ground bacillus can be enriched with its sludge, and then the direct inter-species electronics for promoting ground bacillus to be formed with methanogen
Transmit.However, external source, which adds ethanol, will inevitably increase the operating cost of whole anaerobic technique.Using ethanol-type fermentation
PH regulating measures, that is, the fermentation pH for controlling organic matter is 4.0-4.5, can obtain ethanol and account for leading acidizing product, is the thin end of the scroll
The enrichment of bacterium provides sufficient substrate, and continues to promote direct inter-species electron transmission.Importantly, municipal sludge anaerobism is sent out
The pH of ferment is adjusted to acid (low-kappa number), can reinforcement sludge hydrolysis broken wall, accelerate the release of intracellular polymer, improve production first
Alkane efficiency.Therefore, this preprocessing means using ethanol-type fermentation are expected to solve the two big of municipal sludge anaerobic digestion simultaneously
Problem.
The content of the invention for solve municipal sludge anaerobic digestion two hang-ups, i.e., relatively slow sludge hydrolytic broken wall
Process and it is relatively low introduce a fine variety sludge activity, and then limit municipal sludge anaerobic digestion efficiency, the present invention proposes following technology
Scheme：It is pretreatment tank suspended sludge area (9) in pretreatment tank body (7) provided with pretreatment tank heat-insulation layer (8), pretreatment tank hangs
Floating sludge area (9) bottom is provided with pretreatment tank water-locator (6), the master of pretreatment tank mixer of the lower section provided with splash bar i (10-1)
The upper lid of axle (10-2) through pretreatment tank body (7) stretches into pretreatment tank suspended sludge area (9)；Pre-process the upper lid of tank body (7)
Provided with pretreatment tank discharge duct (11) and valve ii (12)；Pretreatment tank feed pump (3) one end via pipe i (2) insert into
Batch can (1) and the other end are connected via pipe ii (5), valve i (4) with the bottom of pretreatment tank body (7)；The one of acid regulation pump (15)
End via pipe iii (14) insert sour regulating reservoir (13) and the other end via pipe iv (16), valve iii (17) and pretreatment tank body
(7) bottom connection；Alkali regulation pump (20) one end via pipe v (19) insert alkali regulating reservoir (18) and the other end via pipe vi
(22), valve iv (21) is connected with the bottom of pretreatment tank body (7)；One end of fermentation tank feed pump (25) is via pipe viii (26)
Be connected with the bottom of the fermentation tank (28) provided with heat-insulation layer ii (29) and the other end via pipe vii (23), valve v (24) also with
Pre-process the bottom connection of tank body (7)；It is bottom-up in fermentation tank (28) to be sequentially provided with fermentation tank water-locator (27), fermentation tank
Suspended sludge area (30)；The main shaft (31-2) of fermentation tank mixer of the lower section provided with splash bar ii (31-1) passes through fermentation tank (28)
Upper lid stretch into fermentation tank suspended sludge area (30)；Fermentation tank discharge duct (32) and valve are covered with fermentation tank (28)
vi(33)；The pipe ix (34) with valve vii (35) is additionally provided with above the side of fermentation tank (28).
A kind of anaerobic digestion process that municipal sludge is handled using above-mentioned device includes following process：
1) pretreatment tank body and fermentation tank of the formula anaeroic digestor as this technique are thoroughly mixed using with mixer.
2) fermentation tank is started using the anaerobically digested sludge for being derived from municipal sludge treatment plant, controls the dirt in fermentation tank
Mud concentration (MLSS) reaches 20-25g/L, and optimal sludge concentration is 25g/L.
3) use the dewatered sludge (solid content 20%) after being derived from municipal sewage plant press filtration with water in proportion for 1:2-1:4
Mixing, the wet mud that solid content is 10-15% is configured to, is stored in head tank.
4) mixed using dense HCI solution (technical grade, purity >=95%) with water, be configured to 2-4mol/L HCI solution, store
In the presence of sour regulating reservoir.
5) mixed using NaOH solids (technical grade, purity >=95%) with water, be configured to 5-10mol/L NaOH solution,
It is stored in alkali regulating reservoir.
6) pretreatment tank feed pump and valve i are opened, wet mud is from head tank via pipe i, pipe ii, pretreatment tank water-locator
Flow into pretreatment tank suspended sludge area in pretreatment tank body.
7) after charging terminates, valve i and pretreatment tank feed pump are closed.Open acid regulation pump and valve iii, HCI solution
Flowed into from sour regulating reservoir via pipe iii, pipe iv, pretreatment tank water-locator in pretreatment tank body and pre-process tank suspended sludge area.
8) pretreatment tank mixer is opened, it is 30-50rpm, optimum speed 30rpm to control speed of agitator.
9) valve ii is opened, caused gas in tank body is pre-processed and pre-processes tank via pretreatment tank discharge duct discharge
Body.
10) the solid retention time control of tank body is pre-processed at 6-8 days, and optimal water power standing time is 8 days；Pre-process tank
Internal pH controls are between 4.0-5.0, Optimal pH 4.5；Temperature control is in 25-30 DEG C, optimum temperature in pretreatment tank body
30℃。
11) after wet mud pretreatment terminates, valve iii and acid regulation pump are closed.Open alkali regulation pump and valve iv, NaOH
Solution flows into pretreatment tank body via pipe iii, pipe iv, pretreatment tank water-locator from alkali regulating reservoir and pre-processes tank suspended sludge
Area.PH in tank body is pre-processed to control in 6.5-7.5, Optimal pH 7.2.
12) wet mud pH is adjusted to neutrality, closes valve iv and alkali regulation pump.Valve v and fermentation tank intake pump are opened,
Wet mud from pretreatment tank body in via pipe vii, pipe viii flow into provided with fermentation tank heat-insulation layer fermentation tank in, by it is lower extremely
On, successively by fermentation tank water-locator, fermentation tank suspended sludge area.
13) valve vi is opened, caused gas discharges fermentation tank via fermentation tank discharge duct in fermentation tank.
14) solid retention time in fermentation tank was controlled at 18-24 days, and optimal solid retention time is 22 days；Fermentation
PH controls are 7.0-7.5 in tank body, Optimal pH 7.2；For temperature control at 35-37 DEG C, optimum temperature is 37 DEG C in fermentation tank.
15) after wet mud fermentation ends, valve vii is opened, wet mud flows out fermentation tank out of fermentation tank via pipe ix
Body.
This municipal sludge anaerobic digestion process based on ethanol-type fermentation pretreatment has the special feature that：Using ethanol-type
The preprocessing means of fermentation, that is, the pH for controlling the sludge pretreatment stage are 4.0-5.0, can effectively destroy activated sludge cell
Wall, phospholipid layer and polypeptide chain structure are destroyed, discharge intracellular polymer, being provided for anaerobic sludge digestion methane phase can more utilize
Substrate, improve methane production.In addition, using the preprocessing means of ethanol-type fermentation, regulate and control sludge anaerobic hydrolysis acidification, can
Obtain ethanol and account for leading acidizing product.The product can stimulate microbiologic population in the sludge fermentation stage, be enriched with ground bacillus, and
Promote it quickly to establish direct inter-species electronics with methanogen to be connected, maintain the normal operation of methane phase metabolism.The technique makes up
Sludge is introduced a fine variety because activity is not high, causes anaerobic fermentation microorganism/acidifying bacterium to establish inter-species electronic link (inter-species hydrogen with methane phase
Gas transmission) it is slowly insufficient, anaerobic sludge digestion methanation at initial stage stagnation is alleviated, improves sludge reduction and methane phase effect
Rate.The technological investment cost is few, simple to operate, improves positive effect, can be applied to existing municipal sludge anaerobic digestion process
Upgrading.
Brief description of the drawings：Fig. 1 is that a kind of municipal sludge anaerobic digestion device based on ethanol-type fermentation pretreatment of the present invention shows
It is intended to.
In Fig. 1：1st, head tank, 2, pipe i, 3, pretreatment tank feed pump, 4, valve i, 5, pipe ii, 6, pretreatment tank water distribution
Device, 7, pretreatment tank body, 8, heat-insulation layer i, 9, pretreatment tank suspended sludge area, 10-1, splash bar i, 10-2, pretreatment tank mixer
Main shaft, 11, pretreatment tank discharge duct, 12, valve ii, 13, sour regulating reservoir, 14, pipe iii, 15, acid regulation pump, 16, pipe iv,
17th, valve iii, 18, alkali regulating reservoir, 19, pipe v, 20, alkali regulation pump, 21, valve iv, 22, pipe vi, 23, pipe vii, 24, valve
V, 25, fermentation tank feed pump, 26, pipe viii, 27, fermentation tank water-locator, 28, fermentation tank, 29, heat-insulation layer ii, 30, fermentation tank
Suspended sludge area, 31-1, splash bar ii, 31-2, fermentation tank mixer main shaft, 32, fermentation tank discharge duct, 33, valve vi, 34,
Pipe ix, 35, valve vii.
Embodiment
This application mechanism of municipal sludge anaerobic digestion process based on ethanol-type fermentation pretreatment is：
1st, using the preprocessing means of ethanol-type fermentation, that is, the pH for controlling the sludge pretreatment stage is 4.0-5.0, Neng Gouyou
Effect ground destroys activated sludge cell membrane, reduces the bond energy of cell wall phospholipid layer and polypeptide chain, destroys phospholipid layer and polypeptide chain
Structure, and then discharge competent cell intracellular polymer, provide more substrates for municipal sludge anaerobic digestion methane phase, raising
Methane production.
2nd, using the preprocessing means of ethanol-type fermentation, regulate and control sludge anaerobic hydrolysis acidification, can obtain ethanol account for it is leading
Acidizing product.The product can stimulate the microbiologic population in sludge fermentation methane phase stage, be enriched with ground bacillus, and then promote it
Direct inter-species electron transmission is established with methanogen.Its main cause is summed up as, compared to other typical acidizing products, such as
Acetic acid, propionic acid, butyric acid etc., the energy that oxidation of ethanol is discharged can fully support the growth and metabolism of ground bacillus.In sludge
Anaerobic digestion methane phase stage, the direct inter-species electron transmission quickly established can make up not high due to introducing a fine variety sludge activity, make
Inter-species hydrogen is formed between methanogen into anaerobic fermentation microorganism (or acidifying bacterium) and transmits slowly deficiency, alleviates sludge and detests
Oxygen digestion methanation at initial stage is stagnated, and improves anaerobic sludge digestion efficiency.
3rd, above two technical scheme is applied to municipal sludge anaerobic digestion simultaneously, municipal sludge can be efficiently solved
Two hang-ups that anaerobic digestion presently, there are, i.e., relatively slow sludge hydrolytic broken wall process and relatively low introduce a fine variety sludge
Activity.Using the preprocessing means of ethanol-type fermentation, on the one hand, relatively comparatively acidic environment can be created, strengthen municipal sludge
Broken wall is hydrolyzed, activated sludge cell intracellular polymer is discharged, more sufficient substrate is provided for methanogen；On the other hand, can
Produce ethanol and account for leading acidizing product, stimulate the microbiologic population in anaerobic sludge digestion methane phase stage, be enriched with ground bacillus, push away
Move it and direct inter-species electron transmission is quickly established with methanogen, maintain the normal operation of methane phase metabolism.
The present invention will be further described with reference to the accompanying drawings and examples：
As shown in figure 1, this municipal sludge anaerobic digestion device based on ethanol-type fermentation pretreatment, has following technology
Feature：It is pretreatment tank suspended sludge area 9 in pretreatment tank body 7 provided with pre-incubation layer i-8.The pretreatment tank suspended sludge area
9 bottoms are provided with pretreatment tank water-locator 6, and the main shaft 10-2 of the pretreatment tank mixer provided with splash bar i-10-1 passes through pretreatment tank
The upper lid of body 7 stretches into pretreatment tank suspended sludge area 9.Pretreatment tank discharge duct 11 and valve are covered with pretreatment tank body 7
Door ii-12.Pre-process one end of tank feed pump 3 via pipe i-2 insert head tank 1 and the other end via pipe ii-5, valve i-4 with
Pre-process the bottom connection of tank body 7.One end of acid regulation pump 15 via pipe iii-14 insert sour regulating reservoir 13 and the other end via
Pipe iv-16, valve iii-17 are connected with pre-processing the bottom of tank body 7.Adjusted via pipe v-19 insertion alkali one end of alkali regulation pump 20
Section pond 18 and the other end via pipe vi-22, valve iv-21 with pretreatment tank body 7 bottom be connected.The one of fermentation tank feed pump 25
End via pipe viii-26 be connected with the bottom of fermentation tank 28 and the other end via pipe vii-23, valve v-24 and pre-process tank
The bottom connection of body 7.It is bottom-up in fermentation tank 28 provided with heat-insulation layer ii-29 to be sequentially provided with fermentation tank water-locator 27, hair
Fermentation tank suspended sludge area 30.Fermentation tank mixer main shaft 31-2 provided with splash bar ii-31-1 stretches through the upper lid of fermentation tank 28
Enter fermentation tank suspended sludge area 30.Fermentation tank discharge duct 32 and valve vi-33 are covered with fermentation tank 28.Fermentation tank
The pipe ix-34 with valve vii-35 is provided with above 28 side.
A kind of anaerobic digestion process that municipal sludge is handled using above-mentioned device includes following process：
Pretreatment tank body 7 and fermentation tank of the formula anaeroic digestor as this technique are thoroughly mixed using with mixer
28。
Fermentation tank 28 is started using the anaerobically digested sludge for being derived from municipal sludge treatment plant, controlled in fermentation tank 28
Sludge concentration (MLSS) reaches 20-25g/L, and optimal sludge concentration is 25g/L.
Use the dewatered sludge after being derived from municipal sewage plant press filtration (solid content is about 20%) with water in proportion for 1:2-
1:4 mixing, optimal proportion 1:3, be configured to solid content be 10-15% wet mud, optimal solid content be 10%, be stored in into
Batch can 1.
Mixed using dense HCI solution (technical grade, purity >=95%) with water, be configured to 2-4mol/L HCI solution, stored
In sour regulating reservoir 13.Preferably, the optium concentration for the HCI solution prepared is 4mol/L.
Mixed using NaOH solids (technical grade, purity >=95%) with water, be configured to 5-10mol/L NaOH solution, store
Alkali regulating reservoir 18 be present.Preferably, the optium concentration for the NaOH solution prepared is 5mol/L.
Pretreatment tank feed pump 3 and valve i-4 are opened, wet mud is from head tank via pipe i-2, pipe ii-5, pretreatment tank
Water-locator 6 flows into pretreatment tank suspended sludge area 9 in pretreatment tank body 7.
After charging terminates, valve i-4 and pretreatment tank feed pump 3 are closed.Acid regulation pump 15 and valve iii-17 are opened,
HCI solution flows into pretreatment tank body 7 from sour regulating reservoir 13 via pipe iii-14, pipe iv-16, pretreatment tank water-locator 6 from advance
Manage tank suspended sludge area 9.
Pretreatment tank mixer 10 is opened, it is 30-50rpm, optimum speed 30rpm to control speed of agitator.
Valve ii-12 is opened, caused gas in tank body 7 is pre-processed and is pre-processed via the pretreatment discharge of tank discharge duct 11
Tank body 7.
Pre-processing solid retention time control in tank body 7, at 6-8 days, optimal water power standing time is 8 days；Pre-process tank body
PH controls are between 4.0-5.0 in 7, Optimal pH 4.5；Temperature control is in 25-30 DEG C, optimum temperature in pretreatment tank body 7
30℃。
After wet mud pretreatment terminates, valve iii-17 and acid regulation pump 15 are closed.Open alkali regulation pump 20 and valve iv-
21, NaOH solution is flowed into pretreatment tank body 7 from alkali regulating reservoir 18 via pipe iii-19, pipe iv-22, pretreatment tank water-locator 6
Pre-process tank suspended sludge area 9.PH in tank body 7 is pre-processed to control in 6.5-7.5, Optimal pH 7.2.
Wet mud pH is adjusted to neutrality, closes valve iv-21 and alkali regulation pump 20.Open valve v-24 and fermentation tank enters
Water pump 25, wet mud flow into the hair provided with fermentation tank heat-insulation layer 29 out of pretreatment tank body 7 via pipe vii-23, pipe viii-26
In fermentation tank body 28, from the bottom to top, successively by fermentation tank water-locator 27, fermentation tank suspended sludge area 30.
Valve vi-33 is opened, caused gas discharges fermentation tank via fermentation tank discharge duct 32 in fermentation tank 28
28。
Solid retention time in fermentation tank 28 was controlled at 18-24 days, and optimal solid retention time is 22 days；Fermentation tank
PH controls are 7.0-7.5 in body 28, Optimal pH 7.2；Temperature control is at 35-37 DEG C in fermentation tank 28, optimum temperature 37
℃。
After wet mud fermentation ends, valve vii-35 is opened, wet mud flows out out of fermentation tank 28 via pipe ix-34 to be sent out
Fermentation tank body 28.
Embodiment 1：
Dischargeable capacity is used to be thoroughly mixed formula anaeroic digestor as pretreatment tank body for 500mL.Using dischargeable capacity
For the 2L formula anaeroic digestor that is thoroughly mixed the anaerobically digested sludge of municipal sludge treatment plant is derived from as fermentation tank, inoculation
1.5L, sludge concentration 25g/L.Using being derived from dewatered sludge (solid content is about 20%) and water after municipal sewage plant press filtration
It is proportionally 1:3 mixing, the wet mud that solid content is 10% is configured to, is stored in head tank.Using (the industry of dense HCI solution
Level, concentration >=95%) mixed with water, 4mol/L HCI solution is prepared, is stored in sour regulating reservoir.Using (the industry of NaOH solids
Level, concentration >=95%) mixed with water, it is configured to 5mol/L NaOH solution.The solid retention time for pre-processing tank controls 6 days,
The pH controls of pretreatment stage are 4.5, and temperature control is 30 DEG C.The solid retention time control of fermentation tank is 20 days, pH controls
For 7.2, temperature control is 37 DEG C.Compared to traditional municipal sludge anaerobic digestion process, using ethanol-type fermentation pretreatment
Sludge reduction and cumulative methane yield 19% and 25% is respectively increased in municipal sludge anaerobic digestion process.
Embodiment 2：
Dischargeable capacity is used to be thoroughly mixed formula anaeroic digestor as pretreatment tank body for 500mL.Using dischargeable capacity
For the 2L formula anaeroic digestor that is thoroughly mixed the anaerobically digested sludge of municipal sludge treatment plant is derived from as fermentation tank, inoculation
1.5L, sludge concentration 22g/L.Using being derived from dewatered sludge (solid content is about 20%) and water after municipal sewage plant press filtration
It is proportionally 1:3 mixing, the wet mud that solid content is 11% is configured to, is stored in head tank.Using (the industry of dense HCI solution
Level, concentration >=95%) mixed with water, 4mol/L HCI solution is prepared, is stored in sour regulating reservoir.Using (the industry of NaOH solids
Level, concentration >=95%) mixed with water, it is configured to 5mol/L NaOH solution.The solid retention time for pre-processing tank controls 8 days,
The pH controls of pretreatment stage are 4.3, and temperature control is 30 DEG C.The solid retention time control of fermentation tank is 22 days, pH controls
For 7.2, temperature control is 37 DEG C.Compared to traditional municipal sludge anaerobic digestion process, using ethanol-type fermentation pretreatment
Sludge reduction and cumulative methane yield 17% and 22% is respectively increased in municipal sludge anaerobic digestion process.
Claims (2)
1. a kind of municipal sludge anaerobic digestion device based on ethanol-type fermentation pretreatment, has following technical characteristic：Provided with pre-
It is pretreatment tank suspended sludge area (9) in the pretreatment tank body (7) of process tank heat-insulation layer (8), the pretreatment tank suspended sludge
Area (9) bottom is provided with pretreatment tank water-locator (6), the main shaft (10- of pretreatment tank mixer of the lower section provided with splash bar i (10-1)
2) pretreatment tank suspended sludge area (9) is stretched into through the upper lid of the pretreatment tank (7)；It is described to pre-process the upper of tank (7)
It is covered with pretreatment tank discharge duct (11) and valve ii (12)；One end of the pretreatment tank feed pump (3) is via pipe i (2)
Insertion head tank (1) and the other end via pipe ii (5), valve i (4) with it is described pre-process tank body (7) bottom be connected；Acid regulation
One end of pump (15) via pipe iii (14) insert sour regulating reservoir (13) and the other end via pipe iv (16), valve iii (17) and institute
State the bottom connection of pretreatment tank body (7)；One end of alkali regulation pump (20) is another via pipe v (19) insertion alkali regulating reservoirs (18)
End is connected via pipe vi (22), valve iv (21) with the bottom of the pretreatment tank body (7)；One end of fermentation tank feed pump (25)
Via pipe viii (26) with provided with heat-insulation layer ii (29) fermentation tank (28) bottom be connected and the other end via pipe vii
(23), bottoms of the valve v (24) also with the pretreatment tank body (7) is connected；In the fermentation tank (28) it is bottom-up successively
Provided with fermentation tank water-locator (27), fermentation tank suspended sludge area (30)；Lower section is provided with splash bar ii (31-1) fermentation tank mixer
Main shaft (31-2) stretch into fermentation tank suspended sludge area (30) through the upper lid of the fermentation tank (28)；The fermentation tank (28)
On be covered with fermentation tank discharge duct (32) and valve vi (33)；Band valve is additionally provided with above the side of the fermentation tank (28)
Door vii (35) pipe ix (34).
2. a kind of diphasic anaerobic technique that high load capacity organic wastewater is handled using above-mentioned device includes following process：
1) pretreatment tank body (7) and fermentation tank of the formula anaeroic digestor as this technique are thoroughly mixed using with mixer
(28)；
2) fermentation tank (28) is started using the anaerobically digested sludge for being derived from municipal sludge treatment plant, control fermentation tank (28) is interior
Sludge concentration (MLSS) be 20-25g/L, optimal sludge concentration is 25g/L；
3) use the dewatered sludge after being derived from municipal sewage plant press filtration (solid content is about 20%) with water in proportion for 1:2-1:4
Mixing, optimal proportion 1:3, the wet mud that solid content is 10-15% is configured to, optimal solid content is 10%, is stored in charging
Tank (1)；
4) mixed using dense HCI solution (technical grade, purity >=95%) with water, be configured to 2-4mol/L HCI solution, be stored in
Sour regulating reservoir (13)；Preferably, the optium concentration for the HCI solution prepared is 4mol/L；
5) mixed using NaOH solids (technical grade, purity >=95%) with water, be configured to 5-10mol/L NaOH solution, stored
In alkali regulating reservoir (18)；Preferably, the optium concentration for the NaOH solution prepared is 5mol/L；
6) pretreatment tank feed pump (3) and valve i (4) is opened, wet mud is from head tank (1) via pipe i (2), pipe ii (5), in advance
Process tank water-locator (6) flows into pretreatment tank suspended sludge area (9) in pretreatment tank body (7)；
7) after charging terminates, valve i (4) and pretreatment tank feed pump (3) are closed；
8) acid regulation pump (15) and valve iii (17) are opened, HCI solution is from sour regulating reservoir (13) via pipe iii (14), pipe iv
(16), pre-process tank water-locator (6) and flow into pretreatment tank suspended sludge area (9) in pretreatment tank body (7)；
9) pretreatment tank mixer (10) is opened, it is 30-50rpm, optimum speed 30rpm to control speed of agitator；
10) valve ii (12) is opened, caused gas is pre- via pretreatment tank discharge duct (11) discharge in pretreatment tank body (7)
Handle tank body (7)；
11) the interior solid retention time control of tank body (7) is pre-processed at 6-8 days, and optimal water power standing time is 8 days；Pre-process tank
The interior pH controls of body (7) are between 4.0-5.0, Optimal pH 4.5；Tank body (7) interior temperature control is pre-processed at 25-30 DEG C, most preferably
Temperature is 30 DEG C；
12) after wet mud pretreatment terminates, valve iii (17) and acid regulation pump (15) are closed；
13) alkali regulation pump (20) and valve iv (21) are opened, NaOH solution is from alkali regulating reservoir (18) via pipe iii (19), pipe iv
(22), pre-process tank water-locator (6) and flow into pretreatment tank suspended sludge area (9) in pretreatment tank body (7)；
14) it is 6.5-7.5 to pre-process tank body (7) interior pH controls, Optimal pH 7.2；
15) wet mud pH is adjusted to neutrality, closes valve iv (21) and alkali regulation pump (20)；
16) open valve v (24) and fermentation tank intake pump (25), wet mud from pretreatment tank body (7) it is interior via pipe vii (23),
Pipe viii (26) is flowed into the fermentation tank (28) provided with fermentation tank heat-insulation layer (29), from the bottom to top, successively by fermentation tank cloth
Hydrophone (27), fermentation tank suspended sludge area (30)；
17) valve vi (33) is opened, caused gas discharges fermentation via fermentation tank discharge duct (32) in fermentation tank (28)
Tank body (28)；
18) the solid retention time control in fermentation tank (28) is 18-24 days, and optimal solid retention time is 22 days；Fermentation
Tank body (28) interior pH controls are 7.0-7.5, Optimal pH 7.2；Fermentation tank (28) interior temperature control is 35-37 DEG C, optimal temperature
Spend for 37 DEG C；
19) after wet mud fermentation ends, valve vii (35) is opened, wet mud flows out of fermentation tank (28) via pipe ix (34)
Go out fermentation tank (28).
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| CN109295112A (en) * | 2018-09-25 | 2019-02-01 | 大连理工大学 | A kind of diphasic anaerobic processing method digested altogether based on yeast fermented stalk producing and ethanol coupling kitchen garbage |
| CN109355164A (en) * | 2018-09-25 | 2019-02-19 | 大连理工大学 | A kind of the diphasic anaerobic processing unit and technique of wheat stalk fermentation producing and ethanol mixing food wastes |
| CN110240375A (en) * | 2019-05-20 | 2019-09-17 | 同济大学 | A kind of processing method suitable for excess sludge anaerobic digestion |
| CN112851066A (en) * | 2020-12-25 | 2021-05-28 | 江南大学 | Method for enhancing humic acid electron transfer capacity and promoting anaerobic fermentation of sludge to produce acid |
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| CN109207345A (en) * | 2018-09-25 | 2019-01-15 | 大连理工大学 | A kind of device and process that corn stover ethanol-type fermentation coupling municipal sludge anaerobism digests altogether |
| CN109295112A (en) * | 2018-09-25 | 2019-02-01 | 大连理工大学 | A kind of diphasic anaerobic processing method digested altogether based on yeast fermented stalk producing and ethanol coupling kitchen garbage |
| CN109355164A (en) * | 2018-09-25 | 2019-02-19 | 大连理工大学 | A kind of the diphasic anaerobic processing unit and technique of wheat stalk fermentation producing and ethanol mixing food wastes |
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| CN110240375A (en) * | 2019-05-20 | 2019-09-17 | 同济大学 | A kind of processing method suitable for excess sludge anaerobic digestion |
| CN110240375B (en) * | 2019-05-20 | 2021-02-12 | 同济大学 | Method for promoting pre-alcoholization and enhanced anaerobic digestion of excess sludge based on isoelectric points |
| CN112851066A (en) * | 2020-12-25 | 2021-05-28 | 江南大学 | Method for enhancing humic acid electron transfer capacity and promoting anaerobic fermentation of sludge to produce acid |
| CN112851066B (en) * | 2020-12-25 | 2022-01-07 | 江南大学 | Method for enhancing humic acid electron transfer capacity and promoting anaerobic fermentation of sludge to produce acid |
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