CN109928593A - A kind of method of sludge pyrohydrolysis coupling framework material depth - Google Patents
A kind of method of sludge pyrohydrolysis coupling framework material depth Download PDFInfo
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- CN109928593A CN109928593A CN201910234126.8A CN201910234126A CN109928593A CN 109928593 A CN109928593 A CN 109928593A CN 201910234126 A CN201910234126 A CN 201910234126A CN 109928593 A CN109928593 A CN 109928593A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention discloses the methods that a kind of pyrohydrolysis technology coupling framework material technology carries out deeply dehydrating sludge, hydrothermal liquefaction is carried out in ammonia-water systems using Fenton iron cement and obtains the Fenton carbon of amination as framework material, wherein Fenton iron cement hydrothermal liquefaction reaction temperature is 280~340 DEG C, reaction time is 30~90min, the mass ratio of Fenton iron cement and 28% ammonium hydroxide is 1:0.5~1.5, is filtered by vacuum and obtains amination Fenton carbon after carrying out drying grinding.Moisture content is mixed and stirred for uniformly for 80%~85% sludge and amination Fenton carbon skeleton material, the mass ratio of butt sludge and framework material is 0.3~1.2；It feeds the mixture into hydrothermal reaction kettle and reacts, reaction temperature is 160 DEG C~200 DEG C, and the reaction time is 30~90min, and the mass ratio of mud mixture and water is 1:0.5~1.5, vacuum filtration dehydration is carried out after reaction, the dehydration rate of sludge is 50% or more after handling using this method.The method of the present invention simple process, it is easy to operate, it helps to improve sludge dewatering and facilitates Fenton iron cement recycling application, be conducive to industrialized production.
Description
Technical field
The present invention relates to environmental projects and technical field of sludge treatment, and in particular to a kind of sludge hot-water process deep dehydration
Scheme.
Background technique
Currently, wastewater treatment in China rate is significantly improved as dynamics of the country to efforts at environmental protection continues to increase, however
Along with the processing of large amount of sewage and the tradition of China " the light mud of heavy water ", the problem of sludge treatment is brought, China is about at present
40,000,000 tons of wet municipal sludges (80% moisture content) are generated every year, and this data is also constantly increasing, it is contemplated that the year two thousand twenty is arrived, I
State's municipal sludge annual output is up to 6000~90,000,000 tons, if adding industrial sludge, the sludge of the annual sludge generation in China
Total amount number is surprising, and disposition rate is still less than 60% at present.A large amount of organic pollutant, parasitic ovum, disease are carried in sludge
The substances such as pathogenic microorganism and heavy metal easily generate leachate contamination water source in processes such as storage, transport, processing, generation
Escaping gas pollutes atmosphere, is no less than sewage to the pollution of environment.
Moisture percentage in sewage sludge after mechanism filter-pressing is still relatively high, usually 80%~85%, therefore sludge dewatering minimizing
It is treated as a primary and extremely important step in sludge handling process.Currently used method has heat drying method, anaerobism
Digestion method and pyrohydrolytic method etc..Mechanical dehydration method is currently the main dehydration scheme of sludge, main to utilize mechanical gravity, centrifugation
Moisture in the separated sludges such as power, pressure and suction force, but Mechanical Method is dehydrated limited and Mechanical Method and can not destroy or go
Except the organic matter and sex pheromone etc. (CN 108249720A, CN 104556621A) in sludge；Heat drying method utilizes heating
Moisture in sludge is removed, although dehydration rate is very high, is consumed energy larger, and during thermal dehydration be easy to produce NH3With
H2The foul gas such as S cause secondary pollution (CN 105668980A, CN 107827334A)；Anaerobic digestion and pyrohydrolysis be compared with
Novel and green sludge dewatering and processing technique, anaerobic digestion are in the absence of oxygen, common with anaerobic bacteria using amphimicrobe
Organic matter in sludge is decomposed into methane and carbon dioxide, reduces content of organics in sludge, improves sludge dewatering by effect
Rate, moreover it is possible to generate the useful by-product such as methane, have a good application prospect, but this method efficiency of sludge treatment is relatively low
(CN 108358429A, CN 108164124A)；Pyrohydrolysis processing mainly utilizes water dielectric constant under high-temperature and high-pressure conditions
Variation, promote the hydrolysis of organic matter such as protein in sludge to reach destruction extracellular polymeric, discharge water intracellular therein, realize
The purpose of sludge dewatering is effectively carried out, but most sludge pyrohydrolysis dehydration rates are lower than 50% (CN1569699A, CN at present
108623119A).The extracellular polymeric structure for being primarily due to sludge causes sludge dewatering to receive certain journey without destroying completely
Degree limitation.Since there is sludge certain viscoplasticity sludge to be caused to be easily deformed in compression process, can not achieve effective
Filter-press dehydration purpose.Framework material or filter aid improve sludge compressibility and improve pressure commonly used in improving sludge viscoplasticity
The mechanical strength and permeability of sewage sludge solid, achieve the purpose that deep dehydration, there are commonly inorganic material and agricultural in compression process
Waste etc. (CN 108929023A, CN107032580A, CN 106045271A).Although plus framework material facilitates sludge and takes off
Water, but mechanism filter-pressing time long energy consumption is relatively high, and significantly reduces sludge filter cake conduct after inorganic skeleton material is added
The calorific value of solid fuel.At present although sludge part dehydration may be implemented in Fenton oxidation or class Fenton oxidation process, but
It is that can not achieve deep dehydration, general moisture percentage in sewage sludge is still 70% or more.
Although there are various research approaches to be used to realize deeply dehydrating sludge purpose at present, industry really can be effectively carried out
The sludge dewatering scheme for changing processing is fewer and fewer.Therefore the practicable deeply dehydrating sludge scheme with application value is found
Have great importance.
Summary of the invention
Goal of the invention: in order to solve appeal technical solution, the invention discloses a kind of sludge hot technology for hydrolyzing to couple skeleton
The method of material technology progress deeply dehydrating sludge.
Technical solution: the invention discloses a kind of pyrohydrolysis technology coupling framework materials to carry out deeply dehydrating sludge scheme,
Deep dehydration is carried out to sludge it is characterized by: passing through pyrohydrolysis technology and coupling framework material, steps are as follows:
(1) by moisture content be 80%~85% pending mud and amination Fenton carbon as framework material mix and stir
The mass ratio of acquisition mud mixture after mixing uniformly, butt sludge and framework material is 1:(0.3~1.2)；
(2) will step (1) obtain mud mixture be added hydrothermal reaction kettle in, guarantee dischargeable capacity 80% hereinafter,
Hydrothermal liquefaction reaction temperature is 160~200 DEG C, the reaction time is 30~90min；
(3) reaction product that step (2) obtain is carried out dehydrating, obtains filtrate and dewatered sludge filter cake.
Further, the framework material is the amination Fenton carbon that Fenton iron cement hydrothermal liquefaction obtains.
Further, the Fenton iron cement is resulting containing ferric after Fenton oxidation technique in sewage disposal process
Mud.
Further, the preparation step of the Fenton iron cement hydrothermal liquefaction preparation amination Fenton carbon is as follows:
(1.1) Fenton iron cement and ammonium hydroxide are mixed and stirred for uniformly, the mass ratio of Fenton iron cement and ammonium hydroxide for 1:0.5~
1.5；
(1.2) mixture for obtaining step (1) is added in hydrothermal reaction kettle, guarantees dischargeable capacity 80% hereinafter, so
Hydrothermal liquefaction reaction is carried out afterwards, and reaction temperature is 280~340 DEG C, the reaction time is 30~90min；
(1.3) reaction product that step (2) obtain is carried out dehydrating, obtains filtrate and solid product, solid product
Using distilled water flushing, then drying for 24 hours, is clayed into power at 100 DEG C.
Further, ammoniacal liquor mass concentration 28% in the step (1.1).
Further, the mass ratio of mud mixture and water is 1:0.5~1.5 in the step (2).
Further, the granularity after the amination Fenton carbon is ground up, sieved is 100 mesh~300 mesh screenings.
The present invention utilizes pyrohydrolysis technology, and contains amido (- NH2) framework material as catalyst, promote in sludge
The hydrolysis of extracellular polymeric, and deep dehydration purpose is realized under framework material existence condition；Simultaneously the invention discloses amine
Change Fenton carbon skeleton material, the compressibility of sludge not only can be enhanced in sludge dehydration process, the framework material also contains
There is amido (- NH2), the hydrolysis of extracellular polymeric in sludge is promoted, the dehydration rate of sludge is further improved.
Beneficial effects of the present invention: the present invention has the advantage that in terms of existing technologies
(1) present invention couples framework material method using pyrohydrolytic method and carries out deeply dehydrating sludge, and pyrohydrolytic method avoids dirt
The energy loss of water the taken away gasification latent heat of liquid, energy saving cut operating costs in mud.
(2) the amination Fenton carbon that the present invention is obtained using Fenton iron cement hydrothermal liquefaction both promotes dirt as framework material
The dehydration of mud also achieves Fenton iron cement recycling treatment.
(3) since sludge hydrolytic can be promoted under alkaline condition, water is carried out to Fenton iron cement as solvent using ammonium hydroxide
When hydrothermal solution, the framework material obtained after amination has amido, can effectively facilitate the hydrolysis of extracellular polymeric in sludge, make bone
Frame material has the function of catalyzing hydrolysis.
(4) amination Fenton carbon has certain calorific value, and compared to other inorganic material, dewatered sludge filter cake is as solid
Fluid fuel to influence less, dewatered sludge directly can be recycled burning, avoid existing skill using calorific value
It is inorganics doped in art excessively to recycle.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.
Embodiment 1: under normal temperature and pressure, take 20 grams of the Fenton iron cement of moisture content 55% and weigh 20 grams 28% ammonium hydroxide stirring
It is added in hydrothermal reaction kettle afterwards, guarantees dischargeable capacity 80% hereinafter, increasing temperature to 280 DEG C of progress hydrothermal liquefaction reactions, instead
It is 60min between seasonable, hydrothermal liquefaction is washed and filtered with deionized water after reaction, dries ground 100 at 100 DEG C
Mesh obtains amination Fenton carbon.
10 grams of municipal sludge of moisture content 80% are taken to stir evenly with 1.6 donaxine Fenton carbon and hydrothermal reaction kettle is added
In, for guarantee dischargeable capacity 80% hereinafter, increasing temperature to 160 DEG C and carrying out pyrohydrolysis reaction, the water of addition is 11.6 grams,
Reaction time is 90min, and pyrohydrolysis is filtered by vacuum using vacuum pump after reaction, obtains the mud cake that moisture content is 42%
And filtrate.
Embodiment 2: under normal temperature and pressure, after taking 20 grams of the Fenton iron cement of moisture content 55% and weighing 10 gram of 28% ammonium hydroxide stirring
It is added in hydrothermal reaction kettle, guarantees dischargeable capacity 80% hereinafter, increasing temperature to 300 DEG C of progress hydrothermal liquefaction reactions, reaction
Time is 90min, and hydrothermal liquefaction is washed and filtered with deionized water after reaction, in 100 DEG C of ground 300 mesh of drying
Sieve obtains amination Fenton carbon.
10 grams of municipal sludge of moisture content 85% are taken to stir evenly with 2.4 donaxine Fenton carbon and hydrothermal reaction kettle is added
In, for guarantee dischargeable capacity 80% hereinafter, increasing temperature to 180 DEG C and carrying out pyrohydrolysis reaction, the water of addition is 6.2 grams,
Reaction time is 60min, and pyrohydrolysis is filtered by vacuum using vacuum pump after reaction, obtains the mud cake that moisture content is 39%
And filtrate.
Embodiment 3: under normal temperature and pressure, take 20 grams of the Fenton iron cement of moisture content 55% and weigh 30 grams water stirring after be added
In hydrothermal reaction kettle, guarantee dischargeable capacity 80% hereinafter, increasing temperature to 340 DEG C of progress hydrothermal liquefaction reactions, reaction time
For 30min, hydrothermal liquefaction is washed and is filtered with deionized water after reaction, is obtained in 100 DEG C of ground 200 meshes of drying
To amination Fenton carbon.
10 grams of municipal sludge of moisture content 85% are taken to stir evenly with 3.2 donaxine Fenton carbon and hydrothermal reaction kettle is added
In, 80% hereinafter, increasing temperature to 200 DEG C and carries out pyrohydrolysis liquefaction reaction, the water of addition is guarantee dischargeable capacity
19.8 grams, reaction time 30min, pyrohydrolysis is filtered by vacuum using vacuum pump after reaction, is obtained moisture content and is
35% mud cake and filtrate.
Embodiment 4: under normal temperature and pressure, after taking 20 grams of the Fenton iron cement of moisture content 55% and weighing 20 gram of 28% ammonium hydroxide stirring
It is added in hydrothermal reaction kettle, guarantees dischargeable capacity 80% hereinafter, increasing temperature to 280 DEG C of progress hydrothermal liquefaction reactions, reaction
Time is 60min, and hydrothermal liquefaction is washed and filtered with deionized water after reaction, is ground up, sieved in 100 DEG C of drying
To amination Fenton carbon.
10 grams of municipal sludge of moisture content 80% are taken to stir evenly with 1.6 donaxine Fenton carbon and hydrothermal reaction kettle is added
In, for guarantee dischargeable capacity 80% hereinafter, increasing temperature to 160 DEG C and carrying out pyrohydrolysis reaction, the water of addition is 11.6 grams,
Reaction time is 90min, and pyrohydrolysis is filtered by vacuum using vacuum pump after reaction, obtains the mud cake that moisture content is 44%
And filtrate.
Embodiment 5: under normal temperature and pressure, after taking 20 grams of the Fenton iron cement of moisture content 55% and weighing 10 gram of 28% ammonium hydroxide stirring
It is added in hydrothermal reaction kettle, guarantees dischargeable capacity 80% hereinafter, increasing temperature to 300 DEG C of progress hydrothermal liquefaction reactions, reaction
Time is 90min, and hydrothermal liquefaction is washed and filtered with deionized water after reaction, is ground up, sieved in 100 DEG C of drying
To amination Fenton carbon.
10 grams of municipal sludge of moisture content 84% are taken to stir evenly with 2.4 donaxine Fenton carbon and hydrothermal reaction kettle is added
In, for guarantee dischargeable capacity 80% hereinafter, increasing temperature to 180 DEG C and carrying out pyrohydrolysis reaction, the water of addition is 12.4 grams,
Reaction time is 60min, and pyrohydrolysis is filtered by vacuum using vacuum pump after reaction, obtains the mud cake that moisture content is 40%
And filtrate.
Embodiment 6: under normal temperature and pressure, after taking 20 grams of the Fenton iron cement of moisture content 55% and weighing 30 gram of 28% ammonium hydroxide stirring
It is added in hydrothermal reaction kettle, guarantees dischargeable capacity 80% hereinafter, increasing temperature to 340 DEG C of progress hydrothermal liquefaction reactions, reaction
Time is 30min, and hydrothermal liquefaction is washed and filtered with deionized water after reaction, is ground up, sieved in 100 DEG C of drying
To amination Fenton carbon.
10 grams of municipal sludge of moisture content 83% are taken to stir evenly with 3.2 donaxine Fenton carbon and hydrothermal reaction kettle is added
In, for guarantee dischargeable capacity 80% hereinafter, increasing temperature to 200 DEG C and carrying out pyrohydrolysis reaction, the water of addition is 13.2 grams,
Reaction time is 60min, and pyrohydrolysis is filtered by vacuum using vacuum pump after reaction, obtains the mud cake that moisture content is 36%
And filtrate.
Comparison 1: taking 20 grams and 20 grams water of municipal sludge of moisture content 83%, increases temperature and to 180 DEG C and carries out pyrohydrolysis
Reaction, reaction time 60min, pyrohydrolysis are filtered by vacuum using vacuum pump after reaction, and obtaining moisture content is 58%
Mud cake and filtrate.
20 grams and 20 grams sawdusts of municipal sludge of moisture content 83% are taken, mechanism filter-pressing 4 hours after mixing, obtaining moisture content is
55% mud cake.
Through detecting, the calorific value of middle amination Fenton carbon is 8.92MJ/kg, 200 DEG C of butt sludge and amine in Examples 1 to 6
When change Fenton carbon mass ratio is 1:1, filter cake calorific value is 11.86MJ/kg or so, meets recycling condition.
Claims (7)
1. a kind of pyrohydrolysis technology coupling framework material carries out deeply dehydrating sludge scheme, it is characterised in that: pass through pyrohydrolysis skill
Art simultaneously couples framework material to sludge progress deep dehydration, and steps are as follows:
(1) moisture content is mixed and stirred for for 80%~85% pending mud and the amination Fenton carbon as framework material
The mass ratio of acquisition mud mixture after even, butt sludge and framework material is 1:(0.3~1.2)；
(2) mud mixture for obtaining step (1) is added in hydrothermal reaction kettle, guarantees dischargeable capacity 80% hereinafter, hydro-thermal
Liquefaction reaction temperature is 160~200 DEG C, the reaction time is 30~90min；
(3) reaction product that step (2) obtain is carried out dehydrating, obtains filtrate and dewatered sludge filter cake.
2. a kind of pyrohydrolysis technology coupling framework material technology according to claim 1 carries out deeply dehydrating sludge scheme,
It is characterized in that, the framework material is the amination Fenton carbon that Fenton iron cement hydrothermal liquefaction obtains.
3. a kind of pyrohydrolysis technology coupling framework material technology according to claim 2 carries out deeply dehydrating sludge scheme,
It is characterized in that, the Fenton iron cement is resulting containing ferric mud after Fenton oxidation technique in sewage disposal process.
4. a kind of pyrohydrolysis technology coupling framework material technology according to claim 1 carries out deeply dehydrating sludge scheme,
It is characterized in that, the preparation step of the Fenton iron cement hydrothermal liquefaction preparation amination Fenton carbon is as follows:
(1.1) Fenton iron cement and ammonium hydroxide are mixed and stirred for uniformly, the mass ratio of Fenton iron cement and ammonium hydroxide is 1:(0.5~1.5)；
(1.2) will step (1) obtain mixture be added hydrothermal reaction kettle in, guarantee dischargeable capacity 80% hereinafter, then into
The reaction of row hydrothermal liquefaction, reaction temperature is 280~340 DEG C, the reaction time is 30~90min；
(1.3) reaction product that step (2) obtain is carried out dehydrating, obtains filtrate and solid product, solid product utilizes
Distilled water flushing, then drying for 24 hours, is clayed into power at 100 DEG C.
5. a kind of pyrohydrolysis technology coupling framework material technology according to claim 4 carries out deeply dehydrating sludge scheme,
It is characterized by: ammoniacal liquor mass concentration 28% in the step (1.1).
6. a kind of pyrohydrolysis technology coupling framework material technology according to claim 1 carries out deeply dehydrating sludge scheme,
It is characterized in that, the mass ratio of mud mixture and water is 1:(0.5~1.5 in the step (2)).
7. a kind of pyrohydrolysis technology coupling framework material technology according to claim 4 carries out deeply dehydrating sludge scheme,
It is characterized in that, the granularity after the amination Fenton carbon is ground up, sieved is 100 mesh~300 mesh screenings.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112076723A (en) * | 2020-09-25 | 2020-12-15 | 南京理工大学 | Method for preparing heavy metal adsorbent by using Fenton sludge and application |
| CN112174455A (en) * | 2020-09-28 | 2021-01-05 | 江苏大学 | Method for deeply dehydrating sludge by using modified waste filter bag |
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| CN112174455B (en) * | 2020-09-28 | 2022-10-28 | 江苏大学 | Method for deeply dehydrating sludge by using modified waste filter bag |
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