CN106746467A - A kind of sludge resource recovery method based on digested sludge hydro-thermal process - Google Patents
A kind of sludge resource recovery method based on digested sludge hydro-thermal process Download PDFInfo
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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
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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
- C02F11/02—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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
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Abstract
A kind of sludge resource recovery method based on digested sludge hydro-thermal process of the invention, sludge obtains the dewatered sludge that solid content is 15% 20% after dewater treatment；Dewatered sludge is mixed with the pressing filtering liquid after removing nitrogen phosphorus in the quenched reactor of pulp, and preheated, it is pulp, quenched；Anaerobic digester system, the biogas of generation are pumped into through sludge of the pulp after quenched；Hydro-thermal process is carried out into pyrohydrolysis reactor by sludge after anaerobic digestion, the mixed liquor after the cooling of pyrohydrolysis release of pressure is dehydrated to form dried biogas residues high using plate compression；Pressing filtering liquid, after regulation pH value to 9 11, addition magnesium salts generation guanite realizes the recovery of phosphorus；Again will regulation pH value to after 11 13, carry out ammonia aeration, realize the recovery of nitrogen；Pressing filtering liquid after removing nitrogen phosphorus is back to the quenched reactor of pulp and is mixed with dewatered sludge again, is circulated treatment.Its advantage is：Sludge degradation rate and methane production are effectively improved, while realizing the recovery of nitrogen phosphor resource.
Description
Technical field
The present invention relates to reclamation of solid wastes technical field, especially a kind of sludge based on digested sludge hydro-thermal process
Its recovery method as resource.
Background technology
With China's urbanization and the development of sewage disposal, the urgently safe handling disposal of substantial amounts of excess sludge is produced.Cut
To in March, 2016, China is completed more than 3910 urban wastewater treatment firm, and sewage treatment capacity reaches 1.67 billion cubic meters/day,
Produce 30,000,000 ton of -4,000 ten thousand tons of municipal sludge every year (moisture content is 80%).Yet with China's specific resistance to filtration technology
It is delayed, management and laws and regulations system imperfection, always in the presence of the present situation of " the light mud of heavy water ", 80% sludge lack of standardization topple over
Disposal, and " ten, the water " of national newest promulgation clearly proposes to advance specific resistance to filtration.
Show according to the study, there are about 60%COD, 40%N and 90%P in Sewage Plant water inlet enters in sludge, containing a large amount of in sludge
Biomass energy and N, P resource.Usual Treatment of Sludge expense accounts for 50% or so of Sewage Plant operating cost, and Sewage Plant is unique
The energy can be produced is exactly that, using organic matter production capacity in sludge, anaerobic sludge digestion is most economical effective and most widely used at present
The technology that general waste treatment and energy resources are reclaimed.However, domestic anaerobic sludge digestion engineer applied is limited always, the whole nation is built
Into anaerobic digestion engineering about 60, but can normally run for a long time less than 15, main reasons is that gas generation property is poor, fortune
Row expense is high etc., and anaerobic sludge digestion accounts for more than 60% in the developed country such as Europe and the U.S., and dirty to self-sufficient type
The direction of water factory is developed.
With the breakthrough for carrying out to primary sludge (undigested sludge) hydro-thermal (also known as pyrohydrolysis) preconditioning technique, detest sludge
Oxygen digestive efficiency is significantly improved.Commercial size pyrohydrolysis anaerobic digestion engineering based on Cambi and Veolia companies
There are 75 abroad building or run, and the technology is increasingly becoming and solves China's low organic sludge treatment disposal
Important technical, and carried out engineering mimoir on Changsha, Zhenjiang, Xiangyang, Beijing and other places, effectively improve sludge organic matter
Anaerobism transformation efficiency.But, existing pyrohydrolysis pretreatment+anaerobic sludge digestion technique admittedly that contains high there is also following asking
Topic：(1) pyrohydrolysis components of system as directed energy and volume are wasted in the degradable organic matter of hydrolysis, and (2) sludge carries out pyrohydrolysis can not
Directly it is dehydrated with addition chemical agent, but biogas residue dewatering relative can be deteriorated after pyrohydrolysis sludge digestion, (3) anaerobism
, with the also certain room for promotion of development, there be not substantial amounts of nitrogen phosphor resource in (4) sludge for digested sludge degree of stability and quality
Effectively reclaimed.
For the low problem of China's municipal sludge conventional anaerobic digestion efficiency, carry out at present on pyrohydrolysis pretreatment+
Height is more containing solid anaerobic digestion techniques research, and patent document 201110319442.9 discloses a kind of high continuous containing solid biological sludge
Pyrohydrolysis apparatus and method, flash reactor and flash-off steam vapour storage tank are combined and carries out dirt by Biogas Digester, HTHP
Sliming-hydro-thermal-efficient anaerobic digestion, while the high efficiente callback for realizing flash distillation heat energy is utilized.But the method wastes portion
Divide pyrohydrolysis volume and energy on degradable organic matter, particularly process primary sludge content mixing sludge higher, and natural pond
Slag dewatering is deteriorated.In addition, patent document 201610355208.4 discloses the sludge digestion technique of reinforcing in the middle of a kind of, it is dirty
Mud first carries out common anaerobic digestion and removes degradable organic matter, then using means such as acid, alkali, ultrasound, heat treatments, makes to be difficult drop
Solution organic matter transformation is degradable organic matter, then is digested, and realizes improving the purpose of sludge degradation and aerogenesis, but exists and detest
The oxygen digestion residence time is long, the big shortcoming of reactor volume.Patent document 201510271760.0 discloses a kind of anaerobic digestion
Sludge tempering system and method, primary sludge mix with the hydro-thermal sludge and pressing filtering liquid of backflow first, then carry out anaerobic digestion, produce
Raw biogas is used to generate electricity, and digested sludge carries out concentrating-centrifugal dehydration by adding high polymer coagulant, and solid enters pyrohydrolysis
Retort carries out hydro-thermal process, and pyrohydrolysis sludge and centrifugal dehydration pressing filtering liquid are back to mud inlet end.The method is mainly using rearmounted
The technique of pyrohydrolysis treatment, substantially increases the utilization ratio of the energy, but does not account for biogas residue dehydration and nitrogen phosphor resource time
Receive, do not make full use of the hydrothermal of pyrohydrolysis, and digestive system may be caused containing ammonia nitrogen pyrohydrolysis sludge reflux high
Suppress.
Sludge pretreatment, conventional hot water's solution Effect of Pretreatment are mainly concentrated in research on pyrohydrolysis technology both at home and abroad at present
Slow this speed limit step of sludge organic matter hydrolysis is mainly solved, improves sludge mobility and follow-up dewatering, but mesh
Preceding engineer applied shows that dewatering performance of sludge is substantially improved after hydrothermal pretreatment, but its biogas residue after anaerobic digestion
Dewatering declines again, causes dehydration chemical feeding quantity and moisture content still undesirable.Pyrohydrolysis technology is used to improve sludge dewatering earliest
Performance, but at present only several reports on rearmounted pyrohydrolysis also without completely using pyrohydrolysis sludge dewatering is lifted with
And the advantage of nitrogen phosphorus release.
The content of the invention
The technical problems to be solved by the invention are directed to above-mentioned state of the art, and provide a kind of dirty based on digestion
The sludge resource recovery method of muddy water heat treatment, by the combination containing solid anaerobic digestion techniques and rearmounted pyrohydrolysis technology by height,
Sludge degradation rate and methane production can be effectively improved, dewatering performance of sludge is significantly improved, chemical feeding quantity is reduced, while high efficiente callback
Nitrogen phosphor resource, realizes the high efficiente callback of sludge resource.
The present invention solve the technical scheme that is used of above-mentioned technical problem for：
A kind of sludge resource recovery method based on digested sludge hydro-thermal process, comprises the following steps：
Step one, the sludge of municipal sewage plant is obtained after dewater treatment solid content be 15%-20% dewatered sludge；
Step 2, dewatered sludge are mixed with the pressing filtering liquid after removing nitrogen phosphorus in the quenched reactor of pulp, and preheated,
It is pulp, quenched；
Step 3, the sludge through pulp after quenched pump into anaerobic digester system, and the biogas of generation reclaims profit by co-generation unit
With；
Step 4, carry out hydro-thermal process into pyrohydrolysis reactor by sludge after anaerobic digestion, high temperature kills anaerobe,
A large amount of degradable organic matters are discharged, the mixed liquor after the cooling of pyrohydrolysis release of pressure directly is dehydrated to form high level cadre natural pond using plate compression
Slag；
Step 5, pressing filtering liquid, after regulation pH value to 9-11, add magnesium salts, generate guanite, realize the recovery of phosphor resource；
Step 6, again will regulation pH value to after 11-13, carry out ammonia aeration, realize the recovery of nitrogen resource；
Pressing filtering liquid after step 7, removing nitrogen phosphorus is back to the quenched reactor of pulp and is mixed with dewatered sludge again, is followed
Ring treatment.
It is optimization above-mentioned technical proposal, the measure taken also includes：
In above-mentioned step two, after dewatered sludge mixes with the pressing filtering liquid after removing nitrogen phosphorus, the solid content of sludge is 12%-15%.
In above-mentioned step two, the residence time is 4h-8h in the quenched reactor of pulp.
In above-mentioned step two, the preheating thermal source of the quenched reactor of pulp is from produced after digested sludge hydro-thermal process
Release of pressure steam.
In above-mentioned step two, temperature is 60 DEG C -80 DEG C after sludge preheating.
The hydrothermal temperature of above-mentioned hydro-thermal process is 120 DEG C -175 DEG C, and the hydro-thermal time is 0.3h-1h.
Above-mentioned magnesium salts is MgCl2。
Above-mentioned step three, anaerobic digester system is homogenous anaerobic digestive system, or the diphasic anaerobic of acidifying+digestion disappears
Change system.
In above-mentioned homogenous anaerobic digestive system, the middle single-phase temperature of temperature is 35 ± 1 DEG C, residence time 15d-20d.
In the two-phase anaerobic digestion system of above-mentioned acidifying+digestion, acidifying phase temperature is 50 DEG C -70 DEG C, and the residence time is
1d-4d, middle temperature methanogenic phase temperature is 35 ± 1 DEG C, and the residence time is 12d-15d.
Compared with prior art, a kind of sludge resource recovery method based on digested sludge hydro-thermal process of the invention, by inciting somebody to action
Combination of the height containing solid anaerobic digestion techniques and rearmounted pyrohydrolysis technology, with advantages below：
(1) rearmounted pyrohydrolysis technology realizes the release of organic matter and nitrogen phosphorus in biogas residue simultaneously, is conducive to significantly improving system degraded
Rate and methane production, while realizing the high efficiente callback of nitrogen phosphorus；
(2) rearmounted pyrohydrolysis technology significantly improves biogas residue dewatering, reduces chemical feeding quantity, saves medicine consumption；
(3) rearmounted pyrohydrolysis release of pressure steam is used for feed sludge pulp, effectively improves sludge mobility, while having rich in degradable
It is quenched that the alkaline pressing filtering liquid of machine matter and humic type organic carries out pulp to primary sludge, degradable organic matter improve methane production and
System degradation rate, the fixed heavy metal of humic type organic complexing, further improves the biodegradation of organic matter.
Brief description of the drawings
Fig. 1 is process chart of the invention.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in figure 1,
A kind of sludge resource recovery method based on digested sludge hydro-thermal process of the present invention, it is comprised the following steps：Municipal sewage
Treatment plant's sludge by solid content after dewater treatment be 15-20%, dewatered sludge with remove nitrogen phosphorus after pressing filtering liquid it is quenched in pulp
Mixed in reactor, and preheated using release of pressure steam produced after digested sludge hydro-thermal process, it is pulp, quenched,
Sewage sludge viscosity is reduced, sludge mobility is improved, temperature is 60 DEG C -80 DEG C after sludge preheating, and sludge is in the quenched reactor of pulp
Residence time is 4h-8h, pulp, it is quenched after, sludge solid content is about 10%-15%, and on the one hand the operation improves sludge temperature, one
Aspect sludge shale is carried out it is quenched modified, using in contained a large amount of fixed primary sludges of humus complexing in high-temperature alkaline pressing filtering liquid
Heavy metal, improves the bioavailable property of organic matter and degradation rate, to improve the aerogenesis effect of subsequent anaerobic digestion.It is quenched through pulp
Sludge afterwards pumps into anaerobic digester system, and anaerobic digester system here can use homogenous anaerobic digestive system, or using acid
The two-phase anaerobic digestion system changed+digest, the biogas produced by anaerobic digester system reclaims profit by the way of cogeneration of heat and power CHP
With.When using homogenous anaerobic digestive system, the middle single-phase temperature of temperature is 35 ± 1 DEG C, residence time 15d-20d；Using being acidified+disappear
During the two-phase anaerobic digestion system of change, acidifying phase temperature is 50 DEG C -70 DEG C, and the residence time is 1d-4d, middle temperature methanogenic phase temperature
It it is 35 ± 1 DEG C, the residence time is 12d-15d.
Hydro-thermal process is carried out into pyrohydrolysis reactor by sludge after anaerobic digestion, the hydrothermal temperature of hydro-thermal process is
120 DEG C -175 DEG C, the hydro-thermal time is 0.3h-1h, and high temperature kills anaerobe, discharges a large amount of degradable organic matters, so that aobvious
Work improves the degradation rate of sludge organic matter；Mixed liquor after the cooling of pyrohydrolysis release of pressure need not add chemical agent, directly adopt
It is dehydrated to form dried biogas residues high with plate compression (solid content is more than 40%)；Pressing filtering liquid, pH value is adjusted to after 9-11 using NaOH, is added
Plus magnesium salts (MgCl2), guanite is generated, realize the recovery of phosphor resource；Again will regulation pH value to after 11-13, carry out ammonia aeration, it is real
The recovery of existing nitrogen resource；Pressing filtering liquid after removing nitrogen phosphorus is back to the quenched reactor of pulp and is mixed with dewatered sludge again, enters
Row circular treatment.
This recovery method will be enriched in the high-temperature alkali of easily biodegradable organicses and humic type organic in the quenched reactor of pulp
Property pressing filtering liquid mix quenched with Sewage Plant primary sludge, on the one hand improve primary sludge temperature and the content of organic matter, on the other hand utilize
Contained a large amount of humic type organics carry out being complexed admittedly to the heavy metal in primary sludge in digested sludge hydro-thermal process pressing filtering liquid
It is fixed, to improve the efficiency of subsequent anaerobic digestion.
In said process, in order to reclaim the nitrogen phosphor resource in pyrohydrolysis liquid, while mitigating to ammonia nitrogen high in backflow to digestion
The influence of process, contains substantial amounts of ammonia nitrogen and phosphate in the hydro-thermal pressing filtering liquid, be alkalescence by adding alkali to adjust pH, adds magnesium
Salt, carries out MAP recovery；Regulation pH to 12 or so (11-13) is then proceeded to, remaining ammonia is removed using the method for ammonia-nitrogen desorption
Nitrogen；Hot alkali water solution pressing filtering liquid of the recovery of nitrogen and phosphorus rich in degradable organic matter and humic type organic is back to the quenched pond of pulp,
Dilute and to carry out pulp to primary sludge quenched, improve the total methane production of system.
Embodiment 1
Municipal sewage plant dewatered sludge solid content TS is about 55% for 20%, VS/TS, and dewatered sludge and digested sludge are by plate
The dehydration liquid mixing of frame press filtration is quenched, then charging solid content can be diluted to 15% left side by the backflow of pyrohydrolysis backflow pressing filtering liquid in theory
Feed sludge can be heated to 60 DEG C or so by the right side, pyrohydrolysis release of pressure steam, be processed by 8h or so pulps, and sewage sludge viscosity can be reduced
To less than the 1/10 of former mud, pulp sludge pumps into mesophilic digestion system and carries out efficient methane phase, digests 35 ± 1 DEG C of temperature, stops
Time 15-20d.Digested sludge solid content is about 12%, can directly carry out pyrohydrolysis treatment, and hydrothermal temperature is 120 DEG C, and the time is
60min, because sludge is by anaerobic digestion, degradable material has been degraded, and reduces pyrohydrolysis system bulk and energy consumption disappears
Consumption, release of pressure steam is passed through the quenched reactor of pulp by pipeline after pyrohydrolysis, and the pyrohydrolysis mixed liquor after partial warm down need not
Addition medicament, directly can be dehydrated using plate compression, and up to 40% or so, phosphate content is about mud pump characteristic in pressing filtering liquid
600mg/L, ammonia nitrogen is about 2000mg/L, and pH to 10 or so (9-11) is adjusted using NaOH, adds a certain amount of according to nitrogen and phosphorus content
Mg salt (MgCl2), substantial amounts of guanite can be generated and reclaimed, regulation pH to 12 or so (11-13) is then proceeded to, using natural pond
Gas carries out ammonia aeration, and the alkaline pressing filtering liquid pH after removing nitrogen phosphorus is about 10 or so (9-11), and pressing filtering liquid is simultaneously containing substantial amounts of easy
Degraded organic matter and humic acid, SCOD concentration make Heavy Metals in Digested Sludge up to 5000-20000mg/L, humic type organic
Form is main to be existed with complex state, and system degradation rate can reach more than 50% after pressing filtering liquid backflow, and methane production can be promoted to
350mL CH4/gVSSadd, about 15% or so is improved than pyrohydrolysis pretreatment system, while realizing biomass energy Efficient Conversion and nitrogen
Phosphor resource high efficiente callback.
Embodiment 2
Municipal sewage plant dewatered sludge solid content TS is about 60% for 15%, VS/TS, and primary sludge dilutes and hot water through pressing filtering liquid
Solution release of pressure steam heating pulp, charging solid content is about 12%, and pulp sludge enters 55 DEG C high temperature acidified section, due to entering Ni Zhongbao
Containing a large amount of backflow Dissolved Organic Matters, the residence time to 2d can be shortened, transitory efficient produces acid, subsequently into 35 DEG C of middle temperature methane phases
Reactor, the residence time can be basically completed methane phase process for 14d, be compared with conventional anaerobic digestion, when being substantially shorter stop
Between, reduce reactor volume.Digested sludge carries out pyrohydrolysis post processing, and solid content is about 10%, 175 DEG C of hydrothermal temperature, during hydro-thermal
Between 30min, feed sludge can be heated to 80 DEG C or so by pyrohydrolysis release of pressure steam, be processed by 4h pulps, and sewage sludge viscosity can drop
Less than the 1/10 of as little as former mud.Directly it is dehydrated using plate compression after the cooling of pyrohydrolysis sludge part, it is not necessary to add medicament, mud
Cake solid content contains phosphate about 800mg/L up to 40% or so in press filtration pressing filtering liquid, ammonia nitrogen is about 2500mg/L, using NaOH
Regulation pH to 10 or so (9-11), a certain amount of Mg salt (MgCl is added according to nitrogen and phosphorus content2), substantial amounts of guanite can be generated and entered
Row is reclaimed, and then adjusts pH to 12 or so (11-13), carries out ammonia aeration using biogas, and carry out nitrogen recovery using alkali lye.Removing
Alkaline pressing filtering liquid pH after nitrogen phosphorus is about 10 or so (9-11), and pressing filtering liquid contains substantial amounts of degradable organic matter and humic simultaneously
Acid, up to 5000-30000mg/L, humic type organic makes Heavy Metals in Digested Sludge form main with complex state to SCOD concentration
In the presence of, the bioavailable property of organic matter in primary sludge is improved, up to more than 55%, methane production can be promoted to system total degradation rate
400mL CH4/gVSSadd, about 20% or so is improved than pyrohydrolysis pretreatment system, while realizing biomass energy Efficient Conversion and nitrogen
Phosphor resource high efficiente callback.
Highly preferred embodiment of the present invention has been illustrated, and the various change or remodeling made by those of ordinary skill in the art are not
Can depart from the scope of the present invention.
Claims (10)
1. a kind of sludge resource recovery method based on digested sludge hydro-thermal process, it is characterized in that：Comprise the following steps：
Step one, the sludge of municipal sewage plant is obtained after dewater treatment solid content be 15%-20% dewatered sludge；
Step 2, dewatered sludge are mixed with the pressing filtering liquid after removing nitrogen phosphorus in the quenched reactor of pulp, and preheated,
It is pulp, quenched；
Step 3, the sludge through pulp after quenched pump into anaerobic digester system, and the biogas of generation reclaims profit by co-generation unit
With；
Step 4, carry out hydro-thermal process into pyrohydrolysis reactor by sludge after anaerobic digestion, high temperature kills anaerobe,
A large amount of degradable organic matters are discharged, the mixed liquor after the cooling of pyrohydrolysis release of pressure directly is dehydrated to form high level cadre natural pond using plate compression
Slag；
Step 5, pressing filtering liquid, after regulation pH value to 9-11, add magnesium salts, generate guanite, realize the recovery of phosphor resource；
Step 6, again will regulation pH value to after 11-13, carry out ammonia aeration, realize the recovery of nitrogen resource；
Pressing filtering liquid after step 7, removing nitrogen phosphorus is back to the quenched reactor of pulp and is mixed with dewatered sludge again, is followed
Ring treatment.
2. a kind of sludge resource recovery method based on digested sludge hydro-thermal process according to claim 1, it is characterized in that：
In described step two, after dewatered sludge mixes with the pressing filtering liquid after removing nitrogen phosphorus, the solid content of sludge is 12%-15%.
3. a kind of sludge resource recovery method based on digested sludge hydro-thermal process according to claim 2, it is characterized in that:
In described step two, the residence time is 4h-8h in the quenched reactor of pulp.
4. a kind of sludge resource recovery method based on digested sludge hydro-thermal process according to claim 3, it is characterized in that:
In described step two, the preheating thermal source of the quenched reactor of pulp steams from release of pressure produced after digested sludge hydro-thermal process
Vapour.
5. a kind of sludge resource recovery method based on digested sludge hydro-thermal process according to claim 4, it is characterized in that:
In described step two, temperature is 60 DEG C -80 DEG C after sludge preheating.
6. a kind of sludge resource recovery method based on digested sludge hydro-thermal process according to claim 5, it is characterized in that:
The hydrothermal temperature of described hydro-thermal process is 120 DEG C -175 DEG C, and the hydro-thermal time is 0.3h-1h.
7. a kind of sludge resource recovery method based on digested sludge hydro-thermal process according to claim 6, it is characterized in that:
Described magnesium salts is MgCl2。
8. a kind of sludge resource recovery method based on digested sludge hydro-thermal process according to claim 7, it is characterized in that:
Described step three, anaerobic digester system is homogenous anaerobic digestive system, or the two-phase anaerobic digestion system for being acidified+digesting.
9. a kind of sludge resource recovery method based on digested sludge hydro-thermal process according to claim 8, it is characterized in that:
In described homogenous anaerobic digestive system, the middle single-phase temperature of temperature is 35 ± 1 DEG C, residence time 15d-20d.
10. a kind of sludge resource recovery method based on digested sludge hydro-thermal process according to claim 8, its feature
It is:In the two-phase anaerobic digestion system of described acidifying+digestion, acidifying phase temperature is 50 DEG C -70 DEG C, and the residence time is 1d-4d,
Middle temperature methanogenic phase temperature is 35 ± 1 DEG C, and the residence time is 12d-15d.
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