CN110314650A - A method of magnetic bio charcoal is prepared using sludge - Google Patents
A method of magnetic bio charcoal is prepared using sludge Download PDFInfo
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- CN110314650A CN110314650A CN201910672073.8A CN201910672073A CN110314650A CN 110314650 A CN110314650 A CN 110314650A CN 201910672073 A CN201910672073 A CN 201910672073A CN 110314650 A CN110314650 A CN 110314650A
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- sludge
- desiccation
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- bio charcoal
- charcoal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
-
- 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
-
- 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
-
- 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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
- B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
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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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Abstract
The invention discloses a kind of methods for preparing magnetic bio charcoal using sludge, the described method comprises the following steps: iron salt solutions and alkaline solution are added in sludge to pre-process to sludge；Pretreated sludge is subjected to desiccation to reduce the moisture content in sludge；Pyrolysis processing is carried out to the sludge after desiccation, obtains the magnetic bio charcoal；Wherein, the temperature of the pyrolysis processing is greater than 650 DEG C.The embodiment of the invention provides a kind of methods for preparing magnetic bio charcoal using sludge, and by introducing iron salt solutions and alkaline solution in the sludge pretreatment stage, using magnetic bio charcoal is directly generated after desiccation and pyrolysis, preparation process is simple and convenient.Higher pyrolysis temperature can further enrich the micropore of active carbon during antipyretic, increase the porosity of charcoal, improve the absorption property of charcoal.
Description
Technical field
The present invention relates to charcoal, in particular to a kind of method for preparing magnetic bio charcoal using sludge.
Background technique
Magnetic bio charcoal is that have magnetic charcoal along with material itself while one kind has certain absorption property.
Its advantage is that charcoal utilizes point of additional magnetic field realization charcoal that can be more convenient and other impurities after usage
From.The magnetic bio charcoal and the technique of magnetic active carbon of preparing existing at present is all in the biology prepared by charing, activation
It on the basis of charcoal and active carbon, is reacted using FeCl3 solution and NaOH solution, Fe3O4 is formed on the surface of carbon material, thus real
Existing magnetized purpose.The preparation process of this charcoal is more complex, higher cost, and obtained charcoal absorption property compared with
Difference.
Summary of the invention
In order to solve the above technical problems, the embodiment of the invention provides a kind of sides for preparing magnetic bio charcoal using sludge
Method.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
The embodiment of the invention provides a kind of methods for preparing magnetic bio charcoal using sludge, the described method comprises the following steps:
Iron salt solutions and alkaline solution are added in sludge to pre-process to sludge；Pretreated sludge is subjected to desiccation
To reduce the moisture content in sludge；Pyrolysis processing is carried out to the sludge after desiccation, obtains the magnetic bio charcoal；Wherein, the heat
The temperature of solution processing is greater than 650 DEG C.
Further, the iron salt solutions are ferric chloride solution, ferrum sulfuricum oxydatum solutum or iron nitrate solution.
Further, the concentration of the iron salt solutions is 0.014 ~ 0.020mol/L.
Further, the alkaline solution is that potassium hydroxide solution, sodium hydroxide solution, sodium carbonate liquor, potassium carbonate are molten
At least one of liquid.
Further, the concentration of the alkaline solution is 0.030 ~ 0.060mol/L.
Further, the temperature of the pyrolysis processing is 600 ~ 850 DEG C.
Further, the temperature of the pyrolysis processing is 800 ~ 850 DEG C.
Further, desiccation carries out in desiccation furnace, the desiccation temperature be 150 ~ 210 DEG C, the desiccation residence time be 30 ~
40min。
Further, the moisture percentage in sewage sludge after desiccation is 15 ~ 20%.
Further, it also needs to ferment to partial sludge before pre-processing sludge, the partial sludge of fermentation accounts for entirely
The 5 ~ 30% of portion's sludge weight.
The embodiment of the invention provides a kind of methods for preparing magnetic bio charcoal using sludge, by sludge pretreatment rank
Section introduces iron salt solutions and alkaline solution, and using magnetic bio charcoal is directly generated after desiccation and pyrolysis, preparation process is simply square
Just.Higher pyrolysis temperature can further enrich the micropore of active carbon during antipyretic, increase the porosity of charcoal,
Improve the absorption property of charcoal.
Detailed description of the invention
Fig. 1 is the electron microscope of magnetic bio charcoal in the embodiment of the present invention three.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
Attached drawing, the technical solution of the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is this hair
Bright a part of the embodiment, rather than whole embodiments.Based on described the embodiment of the present invention, those skilled in the art institute
The every other embodiment obtained, belongs to the scope of the present invention.
The embodiment of the invention provides a kind of method for preparing magnetic bio charcoal using sludge, this method includes following step
It is rapid: iron salt solutions and alkaline solution to be added in sludge to pre-process to sludge；Pretreated sludge is subjected to desiccation
To reduce the moisture content in sludge；Pyrolysis processing is carried out to the sludge after desiccation, obtains the magnetic bio charcoal；Wherein, the heat
The temperature of solution processing is greater than 650 DEG C.
By introducing iron salt solutions and alkaline solution in the sludge pretreatment stage, directly generated using desiccation and after being pyrolyzed
Magnetic bio charcoal, preparation process are simple and convenient.Higher pyrolysis temperature can further enrich active carbon during antipyretic
Micropore increases the porosity of charcoal, improves the absorption property of charcoal.
In some preferred embodiments of the invention, the method for magnetic bio charcoal further include: useless by what is generated after pyrolysis processing
Gas burning, and the heat generated that burns is used for above-mentioned desiccation and/or pyrolysis processing.The exhaust gas generated after pyrolysis processing includes but not
It is limited to bio oil and organic matter pyrolysis gas.The waste gas burning generated after pyrolysis is recycled into its heat, is not only convenient for the processing of exhaust gas,
Energy consumption is also reduced, operating cost is reduced.
Further, the method for magnetic bio charcoal further include: after pyrolysis processing, cooled down, such as be cooled to 50
DEG C or so, that is, collect the magnetic bio charcoal product.
In some embodiment of the invention, iron salt solutions are ferric chloride solution, ferrum sulfuricum oxydatum solutum or iron nitrate solution.It is preferred that
Ground, the concentration of iron salt solutions are 0.014 ~ 0.020mol/L.
It is further preferred that alkaline solution is that potassium hydroxide solution, sodium hydroxide solution, sodium carbonate liquor, potassium carbonate are molten
At least one of liquid.Still further preferably, the concentration of alkaline solution is 0.030 ~ 0.060mol/L.
In other embodiments of the invention, the temperature of pyrolysis processing is 680 ~ 850 DEG C.It is further preferred that at pyrolysis
The temperature of reason is 800 ~ 850 DEG C.Pyrolysis processing generally carries out in pyrolysis oven again, it is preferable that when pyrolysis processing, temperature reaches 800
After ~ 850 DEG C, sludge is preferably stopped at least 1h in pyrolysis oven, such as sludge stops 2h in pyrolysis oven, by cracking, taking off
The processes such as hydrogen, reduction reaction generate magnetic bio charcoal.
In some preferred embodiments of the invention, desiccation carries out in desiccation furnace, and desiccation temperature is 150 ~ 210 DEG C, desiccation
Residence time is 30 ~ 40min.
Preferably, the moisture percentage in sewage sludge after desiccation is 15 ~ 20%.
In some other embodiment of the present invention, in order to further increase the magnetism of magnetic sludge, sludge is located in advance
It also needs to ferment to partial sludge before reason, the partial sludge of fermentation accounts for the 5 ~ 30% of whole sludge weight.Fermentation can not only be into
One step improves the magnetism of magnetic sludge, also advantageously improves the porosity of sludge.Through experimental studies have found that, fermentation part is excessively not
It is only little to the magnetic contribution for improving magnetic sludge, and difficulty can be caused to subsequent drying process.
Fermentation process includes: to mix partial sludge with strain, in the environment of ventilation, pH value about 6 ~ 7, at 20 ~ 50 DEG C
The sludge of fermentation, is then uniformly mixed by fermentation 10 ~ 20 days with unfermentable sludge.Preferably, strain is including but not limited to huge
Bacterium anthracoides, bacillus subtilis, colloid bacillus cereus or bacillusmusilaginosiengineering etc..
It should be noted that the sludge in the embodiment of the present invention includes but is not limited to printing and dyeing sludge, electroplating sludge and soda acid
Neutralize sludge.
The method for preparing magnetic bio charcoal to the present invention combined with specific embodiments below is described further, it is possible to understand that
It is that the present invention is not limited to following embodiments.
Embodiment one
The FeCl that 1.5L concentration is 0.015mol/L is added in pretreatment into 8.2kg sludge3Solution and 0.6L concentration are
The KOH solution of 0.035mol/L is uniformly mixed.
Drying and other treatment, after pretreatment, sludge is conveyed, into desiccation furnace, desiccation temperature by storage bucket by feed screw
Degree control stops 40min at 200 DEG C.Moisture percentage in sewage sludge is 16% or so after desiccation, so as to subsequent pyrolysis processing.
Pyrolysis processing, after desiccation, sludge enters pyrolysis oven, and 10 DEG C/min of pyrolysis oven heating rate is warming up to 800 DEG C, stops
Stay 2h in pyrolysis oven, by a series of cracking, dehydrogenation, reduction reaction.
Cooling stage, the product after pyrolysis processing is cooling, specifically can be cooling by spiral water-cooling equipment, it is cooled to 50 DEG C
Left and right carries out the collection of magnetic bio charcoal.
Embodiment two
The FeCl that 1.4L concentration is 0.018mol/L is added in pretreatment into 8.8kg sludge3Solution and 0.6L concentration are
The KOH solution of 0.055mol/L is uniformly mixed.
Drying and other treatment, after pretreatment, sludge is conveyed, into desiccation furnace, desiccation temperature by storage bucket by feed screw
Degree control stops 40min at 160 DEG C.Moisture percentage in sewage sludge is 18% or so after desiccation, so as to subsequent pyrolysis processing.
Pyrolysis processing, after desiccation, sludge enters pyrolysis oven, and 15 DEG C/min of pyrolysis oven heating rate is warming up to 850 DEG C, stops
Stay 2h in pyrolysis oven, by a series of cracking, dehydrogenation, reduction reaction.
Cooling stage, the product after pyrolysis processing is cooling, specifically can be cooling by spiral water-cooling equipment, it is cooled to 50 DEG C
Left and right carries out the collection of magnetic bio charcoal.
Embodiment three
The FeCl that 1.7L concentration is 0.020mol/L is added in pretreatment into 9.8kg sludge3Solution and 0.8L concentration are
The KOH solution of 0.060mol/L is uniformly mixed.
Drying and other treatment, after pretreatment, sludge is conveyed, into desiccation furnace, desiccation temperature by storage bucket by feed screw
Degree control stops 40min at 200 DEG C.Moisture percentage in sewage sludge is 15% or so after desiccation, so as to subsequent pyrolysis processing.
Pyrolysis processing, after desiccation, sludge enters pyrolysis oven, and 10 DEG C/min of pyrolysis oven heating rate is warming up to 660 DEG C, stops
Stay 2h in pyrolysis oven, by a series of cracking, dehydrogenation, reduction reaction.
Cooling stage, the product after pyrolysis processing is cooling, specifically can be cooling by spiral water-cooling equipment, it is cooled to 50 DEG C
Left and right carries out the collection of magnetic bio charcoal.
The electron microscope of charcoal obtained by the present embodiment is as shown in Figure 1.
Example IV
Fermentation, weighs and takes 8.2kg sludge, 0.3kg sludge is uniformly mixed with 0.008kg Bacillus subtilis strain, is being divulged information
In the environment of, pH value about 6 ~ 7 ferments 12 days at 25 DEG C, is then uniformly mixed the sludge of fermentation with unfermentable sludge.
The FeCl that 1.5L concentration is 0.015mol/L is added in pretreatment into the sludge after fermentation3Solution and 0.6L concentration
For the KOH solution of 0.035mol/L, it is uniformly mixed.
Drying and other treatment, after pretreatment, sludge is conveyed, into desiccation furnace, desiccation temperature by storage bucket by feed screw
Degree control stops 40min at 200 DEG C.Moisture percentage in sewage sludge is 16% or so after desiccation, so as to subsequent pyrolysis processing.
Pyrolysis processing, after desiccation, sludge enters pyrolysis oven, and 10 DEG C/min of pyrolysis oven heating rate is warming up to 800 DEG C, stops
Stay 2h in pyrolysis oven, by a series of cracking, dehydrogenation, reduction reaction.
Cooling stage, the product after pyrolysis processing is cooling, specifically can be cooling by spiral water-cooling equipment, it is cooled to 50 DEG C
Left and right carries out the collection of magnetic bio charcoal.
Embodiment five
Fermentation, weighs and takes 8.2kg sludge, 0.4kg sludge is uniformly mixed with 0.009kg Bacillus subtilis strain, is being divulged information
In the environment of, pH value about 6 ~ 7 ferments 12 days at 25 DEG C, is then uniformly mixed the sludge of fermentation with unfermentable sludge.
The FeCl that 1.5L concentration is 0.015mol/L is added in pretreatment into the sludge after fermentation3Solution and 0.6L concentration
For the KOH solution of 0.035mol/L, it is uniformly mixed.
Drying and other treatment, after pretreatment, sludge is conveyed, into desiccation furnace, desiccation temperature by storage bucket by feed screw
Degree control stops 40min at 200 DEG C.Moisture percentage in sewage sludge is 16% or so after desiccation, so as to subsequent pyrolysis processing.
Pyrolysis processing, after desiccation, sludge enters pyrolysis oven, and 10 DEG C/min of pyrolysis oven heating rate is warming up to 800 DEG C, stops
Stay 2h in pyrolysis oven, by a series of cracking, dehydrogenation, reduction reaction.
Cooling stage, the product after pyrolysis processing is cooling, specifically can be cooling by spiral water-cooling equipment, it is cooled to 50 DEG C
Left and right carries out the collection of magnetic bio charcoal.
Embodiment six
Fermentation, weighs and takes 8.2kg sludge, 0.656kg sludge is uniformly mixed with 0.011kg Bacillus subtilis strain, logical
In the environment of wind, pH value about 6 ~ 7 ferments 12 days at 25 DEG C, is then uniformly mixed the sludge of fermentation with unfermentable sludge.
The FeCl that 1.5L concentration is 0.015mol/L is added in pretreatment into the sludge after fermentation3Solution and 0.6L concentration
For the KOH solution of 0.035mol/L, it is uniformly mixed.
Drying and other treatment, after pretreatment, sludge is conveyed, into desiccation furnace, desiccation temperature by storage bucket by feed screw
Degree control stops 40min at 200 DEG C.Moisture percentage in sewage sludge is 16% or so after desiccation, so as to subsequent pyrolysis processing.
Pyrolysis processing, after desiccation, sludge enters pyrolysis oven, and 10 DEG C/min of pyrolysis oven heating rate is warming up to 800 DEG C, stops
Stay 2h in pyrolysis oven, by a series of cracking, dehydrogenation, reduction reaction.
Cooling stage, the product after pyrolysis processing is cooling, specifically can be cooling by spiral water-cooling equipment, it is cooled to 50 DEG C
Left and right carries out the collection of magnetic bio charcoal.
Embodiment seven
Fermentation, weighs and takes 8.2kg sludge, 0.82kg sludge is uniformly mixed with 0.015kg Bacillus subtilis strain, is being divulged information
In the environment of, pH value about 6 ~ 7 ferments 12 days at 25 DEG C, is then uniformly mixed the sludge of fermentation with unfermentable sludge.
The FeCl that 1.5L concentration is 0.015mol/L is added in pretreatment into the sludge after fermentation3Solution and 0.6L concentration
For the KOH solution of 0.035mol/L, it is uniformly mixed.
Drying and other treatment, after pretreatment, sludge is conveyed, into desiccation furnace, desiccation temperature by storage bucket by feed screw
Degree control stops 40min at 200 DEG C.Moisture percentage in sewage sludge is 16% or so after desiccation, so as to subsequent pyrolysis processing.
Pyrolysis processing, after desiccation, sludge enters pyrolysis oven, and 10 DEG C/min of pyrolysis oven heating rate is warming up to 800 DEG C, stops
Stay 2h in pyrolysis oven, by a series of cracking, dehydrogenation, reduction reaction.
Cooling stage, the product after pyrolysis processing is cooling, specifically can be cooling by spiral water-cooling equipment, it is cooled to 50 DEG C
Left and right carries out the collection of magnetic bio charcoal.
Embodiment eight
Fermentation, weighs and takes 8.2kg sludge, 1.82kg sludge is uniformly mixed with 0.025kg Bacillus subtilis strain, is being divulged information
In the environment of, pH value about 6 ~ 7 ferments 12 days at 25 DEG C, is then uniformly mixed the sludge of fermentation with unfermentable sludge.
The FeCl that 1.5L concentration is 0.015mol/L is added in pretreatment into the sludge after fermentation3Solution and 0.6L concentration
For the KOH solution of 0.035mol/L, it is uniformly mixed.
Drying and other treatment, after pretreatment, sludge is conveyed, into desiccation furnace, desiccation temperature by storage bucket by feed screw
Degree control stops 40min at 200 DEG C.Moisture percentage in sewage sludge is 16% or so after desiccation, so as to subsequent pyrolysis processing.
Pyrolysis processing, after desiccation, sludge enters pyrolysis oven, and 10 DEG C/min of pyrolysis oven heating rate is warming up to 800 DEG C, stops
Stay 2h in pyrolysis oven, by a series of cracking, dehydrogenation, reduction reaction.
Cooling stage, the product after pyrolysis processing is cooling, specifically can be cooling by spiral water-cooling equipment, it is cooled to 50 DEG C
Left and right carries out the collection of magnetic bio charcoal.
Embodiment nine
Fermentation, weighs and takes 8.2kg sludge, 2.46kg sludge is uniformly mixed with 0.035kg Bacillus subtilis strain, is being divulged information
In the environment of, pH value about 6 ~ 7 ferments 12 days at 25 DEG C, is then uniformly mixed the sludge of fermentation with unfermentable sludge.
The FeCl that 1.5L concentration is 0.015mol/L is added in pretreatment into the sludge after fermentation3Solution and 0.6L concentration
For the KOH solution of 0.035mol/L, it is uniformly mixed.
Drying and other treatment, after pretreatment, sludge is conveyed, into desiccation furnace, desiccation temperature by storage bucket by feed screw
Degree control stops 50min at 200 DEG C.Moisture percentage in sewage sludge is 16% or so after desiccation, so as to subsequent pyrolysis processing.
Pyrolysis processing, after desiccation, sludge enters pyrolysis oven, and 10 DEG C/min of pyrolysis oven heating rate is warming up to 800 DEG C, stops
Stay 2h in pyrolysis oven, by a series of cracking, dehydrogenation, reduction reaction.
Cooling stage, the product after pyrolysis processing is cooling, specifically can be cooling by spiral water-cooling equipment, it is cooled to 50 DEG C
Left and right carries out the collection of magnetic bio charcoal.
Embodiment ten
Fermentation, weighs and takes 8.2kg sludge, 7.46kg sludge is uniformly mixed with 0.055kg Bacillus subtilis strain, is being divulged information
In the environment of, pH value about 6 ~ 7 ferments 12 days at 25 DEG C, is then uniformly mixed the sludge of fermentation with unfermentable sludge.
The FeCl that 1.5L concentration is 0.015mol/L is added in pretreatment into the sludge after fermentation3Solution and 0.6L concentration
For the KOH solution of 0.035mol/L, it is uniformly mixed.
Drying and other treatment, after pretreatment, sludge is conveyed, into desiccation furnace, desiccation temperature by storage bucket by feed screw
Degree control stops 1.5h at 200 DEG C.Moisture percentage in sewage sludge is 16% or so after desiccation, so as to subsequent pyrolysis processing.
Pyrolysis processing, after desiccation, sludge enters pyrolysis oven, and 10 DEG C/min of pyrolysis oven heating rate is warming up to 800 DEG C, stops
Stay 2h in pyrolysis oven, by a series of cracking, dehydrogenation, reduction reaction.
Cooling stage, the product after pyrolysis processing is cooling, specifically can be cooling by spiral water-cooling equipment, it is cooled to 50 DEG C
Left and right carries out the collection of magnetic bio charcoal.
Performance test
One, absorption property is tested
One active carbon of above-described embodiment (SBC) and commercial active carbon (CAC) are used to wastewater treatment, experiment knot under the same terms
Fruit is shown in Table 1.
Table 1
Charcoal is that sludge is pyrolyzed in the environment of high temperature anaerobic, since steaming for organic matter forms it into porous tool in sludge
There is the product of certain absorption property.The sludge base charcoal through overactivation can operate with denitrogenation dephosphorizing, the cigarette of micro- waste water body at present
The fields such as the desulphurization denitration of gas.Through counting, the yield of charcoal is wet mud amount 10%~13% (relative to over dry sludge
The 50%~65% of amount).
Langmuir equation be assumed based on monolayer derived from, when the suction-operated of the surface of solids is quite uniform, and
When absorption is limited to monolayer, Langmuir can preferable simulated experiment result.Freundlich equation is to pass through mass data
What fitting proposed, be a kind of experiential description of one pack system adsorption equilibrium.
In table 1, the ammonia nitrogen isothermal curve of two kinds of adsorbents of CAC and SBC more meets Langmuir curve, and fits
The maximum adsorption magnitude of CAC can reach 32.87mgg-1, the maximum adsorption magnitude of SBC can reach 16.01mgg-1Fitting
Adsorbance height and the specific surface area trend of charcoal out meets.The adsorption isothermal curve of total phosphorus more meets Langmuir suction
Attached curve can fit SBC, CAC and distinguish the maximal absorptive capacity of total phosphorus by being fitted Langmuir adsorption isothermal curve
It is 12.32,5.17 mgg-1。
Under the same terms, embodiment two to embodiment ten is used for the wastewater treatment of same condition, and experimental result is shown in Table 2.
Table 2
In conjunction with Tables 1 and 2 it is found that the adsorption capacity of the lower embodiment three of pyrolysis temperature is poor, the reason is that, at higher pyrolysis
Reason temperature is conducive to improve the adsorption capacity of charcoal.Specifically, alkaline solution, such as KOH solution meeting under conditions of high temperature
Potassium vapor is formed, is also beneficial to form micropore in biological carbon surface, increases its porosity, improve the absorption property of charcoal.
It should be noted that being returned after the charcoal of embodiment one to embodiment ten adsorbs for the first time by externally-applied magnetic field
The charcoal not less than 95% is received, and after charcoal after the recovery is using 4 recyclings, the adsorption capacity of charcoal
It still is able to keep 80% or so.
Two, magnetic behavior
Under the same terms, the susceptibility of testing example one to ten gained magnetic bio charcoal of embodiment participates in table 3.
Table 3
The specific susceptibility for the magnetic bio charcoal that the embodiment of the present invention is prepared as a result, is greater than 1.26 × 10-7m2/ kg, meets magnetic
The requirement of choosing.(magnetisable material can be divided into ferromagnetic substance, weak magnetic substance and namagnetic substance by specific susceptibility.Its
In, the specific susceptibility of ferromagnetic substance is greater than 3.8 × 10-5m2/ kg can be separated with low-intensity (magnetic) separator；Weak magnetic
The specific susceptibility of substance is 7.5 × 10-6~1.26×10-7m2/ kg can be separated with high intensity magnetic separator；When than magnetization system
Number is less than 1.26 × 10-7m2When/kg, it cannot be separated with magnetic method.)
The other structures of active carbon according to an embodiment of the present invention and operation are all that can manage to those skilled in the art
It solves and easy to accomplish, therefore is not described in detail.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (10)
1. a kind of method for preparing magnetic bio charcoal using sludge, which is characterized in that the described method comprises the following steps:
Iron salt solutions and alkaline solution are added in sludge to pre-process to sludge；Pretreated sludge is subjected to desiccation
To reduce the moisture content in sludge；Pyrolysis processing is carried out to the sludge after desiccation, obtains the magnetic bio charcoal；Wherein, the heat
The temperature of solution processing is greater than 650 DEG C.
2. the method according to claim 1 for preparing magnetic bio charcoal using sludge, which is characterized in that the iron salt solutions
For ferric chloride solution, ferrum sulfuricum oxydatum solutum or iron nitrate solution.
3. the method according to claim 1 for preparing magnetic bio charcoal using sludge, which is characterized in that the iron salt solutions
Concentration be 0.014 ~ 0.020mol/L.
4. the method according to claim 1 for preparing magnetic bio charcoal using sludge, which is characterized in that the alkaline solution
For at least one of potassium hydroxide solution, sodium hydroxide solution, sodium carbonate liquor, solution of potassium carbonate.
5. the method according to claim 1 for preparing magnetic bio charcoal using sludge, which is characterized in that the alkaline solution
Concentration be 0.030 ~ 0.060mol/L.
6. the method according to claim 1 for preparing magnetic bio charcoal using sludge, which is characterized in that the pyrolysis processing
Temperature be 680 ~ 850 DEG C.
7. the method according to claim 6 for preparing magnetic bio charcoal using sludge, which is characterized in that the pyrolysis processing
Temperature be 800 ~ 850 DEG C.
8. the method according to claim 1 for preparing magnetic bio charcoal using sludge, which is characterized in that desiccation is in desiccation furnace
Middle progress, the desiccation temperature are 150 ~ 210 DEG C, and the desiccation residence time is 30 ~ 40min.
9. the method according to claim 1 for preparing magnetic bio charcoal using sludge, which is characterized in that the sludge after desiccation
Moisture content is 15 ~ 20%.
10. the method according to claim 1 for preparing magnetic bio charcoal using sludge, which is characterized in that carried out to sludge
It also needs to ferment to partial sludge before pretreatment, the partial sludge of fermentation accounts for the 5 ~ 30% of whole sludge weight.
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