CN110282624A - A method of active carbon is prepared using sludge - Google Patents
A method of active carbon is prepared using sludge Download PDFInfo
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- CN110282624A CN110282624A CN201910617194.2A CN201910617194A CN110282624A CN 110282624 A CN110282624 A CN 110282624A CN 201910617194 A CN201910617194 A CN 201910617194A CN 110282624 A CN110282624 A CN 110282624A
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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
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- 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
- C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
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- 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
- C01B32/342—Preparation characterised by non-gaseous activating agents
- C01B32/348—Metallic compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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Abstract
The invention discloses a kind of methods for preparing active carbon using sludge, include the following steps: S1, dewatered sludge is added in activator, natural immersion activates after mixing；Wherein, activator is the ZnCl of 3.0mol/L2The mass ratio of solution, dewatered sludge and activator is 1:5；After the completion of S2, activation, centrifugal dehydration；S3, the dewatered sludge after centrifugal dehydration is put into tubular type Muffle furnace, carbonizes 60min respectively under conditions of being passed through protective gas nitrogen, obtain semi-finished product active carbon；Carbonization temperature is 600 DEG C；S4, semi-finished product active carbon is first cleaned with hydrochloric acid, then is in neutrality wash with distilled water to washing lotion, centrifugal dehydration, dry 12h in the baking oven placed at 103 DEG C -105 DEG C, obtain final active sludge carbon finished product.It is clear in structure that the present invention can be prepared holes of products, and intensity is high, and stability is good, can satisfy the active sludge carbon of requirement of the wastewater treatment to the intensity and performance of active carbon.
Description
Technical field
The present invention relates to sludge utilization technology fields, and in particular to a method of active carbon is prepared using sludge.
Background technique
Sludge is the secondary product in sewage treatment plant's sewage disposal process.Currently, the currently used method of wastewater treatment
There are physical method, chemical method, physical-chemical process and bioanalysis.Sediment, particulate matter and floating material can be generated in sewage disposal process
Deng the waste generated in these wastewater treatment process is referred to as sludge.
With environmental protection requirement and the raising of sewage Effluent criteria, sewage treatment facility and the increase for handling depth,
In following 5 years, sludge produces can also increase year by year.At home, with the high speed development of national economy in recent years, China
Sewage treatment facility and degree for the treatment of all can also be greatly improved, and correspondingly, sludge yield will also have biggish increasing
It is long.
Excess sludge is discharged into environment without processing there are also organic principle abundant and is easy smelly, mosquitos and flies is caused to breed
And it gives rise to diseases.The organic principle in excess sludge is efficiently used, can not only achieve the purpose that protect environment, moreover it is possible to become useless
For treasured, economic benefit is generated.
Summary of the invention
In view of the deficiencies of the prior art, the present invention is intended to provide a kind of method for preparing active carbon using sludge, can make
The standby holes of products that obtains is clear in structure, and intensity is high, and stability is good, can satisfy wastewater treatment to the intensity and performance of active carbon
Requirement active sludge carbon.
To achieve the goals above, the present invention adopts the following technical scheme:
A method of active carbon being prepared using sludge, is included the following steps:
S1, dewatered sludge is added in activator, natural immersion activates after mixing；Wherein, activator is 3.0mol/L's
ZnCl2The mass ratio of solution, dewatered sludge and activator is 1:5；
After the completion of S2, activation, centrifugal dehydration；
S3, the dewatered sludge after centrifugal dehydration is put into tubular type Muffle furnace, is divided under conditions of being passed through protective gas nitrogen
Not Tan Hua 60min, obtain semi-finished product active carbon；Carbonization temperature is 600 DEG C；
S4, semi-finished product active carbon is first cleaned with hydrochloric acid, then is in neutrality wash with distilled water to washing lotion, centrifugal dehydration, then
12h is dried in the baking oven being put at 103 DEG C -105 DEG C, obtains final active sludge carbon finished product.
Further, in step S1, activation time is for 24 hours.
Further, in step S3, shield gas flow rate 2.5L/min.
Further, in step S3,600 DEG C of carbonization temperature are warming up to the heating rate of 20 DEG C/min.
The beneficial effects of the present invention are: the active sludge carbon product pore structure being prepared using the method for the present invention is clear
Clear, intensity is high, and stability is good, can satisfy requirement of the wastewater treatment to the intensity and performance of active carbon.
Detailed description of the invention
Influence of the carbonization time to yield is shown under difference activator concentration when Fig. 1 is 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C
It is intended to；
Fig. 2 be 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C when difference activator concentration under carbonization time to methylene blue adsorption number
The influence schematic diagram of value；
Influence of the carbonization time to iodine number is shown under difference activator concentration when Fig. 3 is 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C
It is intended to；
Fig. 4 is that XRD tests gained map；
Fig. 5 is electron-microscope scanning result schematic diagram (20 μm)；
Fig. 6 is electron-microscope scanning result schematic diagram (5 μm).
Specific embodiment
Below with reference to attached drawing, the invention will be further described, it should be noted that the present embodiment is with this technology side
Premised on case, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to this reality
Apply example.
Embodiment 1
The present embodiment provides a kind of methods for preparing active carbon using sludge, include the following steps:
S1, dewatered sludge is added in activator, natural immersion activates after mixing；Wherein, activator is 3.0mol/L's
ZnCl2The mass ratio of solution, dewatered sludge and activator is 1:5；
After the completion of S2, activation, centrifugal dehydration；
S3, the dewatered sludge after centrifugal dehydration is put into tubular type Muffle furnace, is divided under conditions of being passed through protective gas nitrogen
Not Tan Hua 60min, obtain semi-finished product active carbon；Carbonization temperature is 600 DEG C；
S4, semi-finished product active carbon is first cleaned with hydrochloric acid, then is in neutrality wash with distilled water to washing lotion, centrifugal dehydration, then
12h is dried in the baking oven being put at 103 DEG C -105 DEG C, obtains final active sludge carbon finished product.
Further, in step S1, activation time is for 24 hours.
Further, in step S3, shield gas flow rate 2.5L/min.
Further, in step S3,600 DEG C of carbonization temperature are warming up to the heating rate of 20 DEG C/min.
Embodiment 2
The present embodiment is intended to make 1 the method for embodiment further verifying.
The sludge used in the present embodiment comes from Guangzhou Lie De sewage treatment plant, and sludge components are as shown in table 1:
Table 1
Sludge (moisture percentage in sewage sludge 81%) after filter press filters pressing is placed in the baking that temperature is 103 DEG C -105 DEG C
Drying, obtains dewatered sludge in case, spare.
It is respectively charged into 20g dewatered sludge in four 400ml beakers, is 1:5 difference according to dewatered sludge and activator mass ratio
The ZnCl that concentration is 1.0,2.0,3.0,4.0mol/L is added into four beakers2Solution 88.0,79.0,72.0,65.0mL,
After mixing natural immersion for 24 hours, centrifugal dehydration, ZnCl2Solutions Solution is recyclable, reuses.By the dewatered sludge after centrifugal dehydration
It is put into tubular type Muffle furnace, carbonizes 30,40,50,60min respectively under conditions of being passed through protective gas nitrogen, obtain semi-finished product
Active carbon.
Semi-finished product active carbon is first cleaned one time with hydrochloric acid, then is in neutrality wash with distilled water to washing lotion, centrifugal dehydration, then
12h is dried in the baking oven being put at 103 DEG C -105 DEG C, obtains final active sludge carbon finished product.Weighing.
1, the yield of active sludge carbon finished product is calculated as follows:
Wherein, η indicates yield, m1Indicate the quality of dewatered sludge, m2Indicate the quality of active sludge carbon finished product.
2, the measurement of methylene blue adsorption value is carried out to active sludge carbon finished product.
It takes 2mg methylene blue powder to be added in 1000mL water, is configured to the methylene blue solution that concentration is 2.0mg/L,
The methylene blue solution that various concentration is obtained after dilution selects wavelength 665nm, with the colorimetric of 2cm on visible spectrophotometer
Ware measures absorbance, and standard curve is made.Same above-mentioned steps add in the methylene blue solution that 100mL concentration is 2.0mg/L
The active sludge carbon for entering 0.1g vibrates 10min on constant temperature oscillator at a temperature of 20 DEG C, stand the suction of survey solution after 10min
Luminosity, reference standard curve obtain methylene blue concentration value.The concentration of Methylene Blue in Solution before and after active carbon is added in reference,
Calculate the size of active sludge carbon absorption methylene blue value.It is shown below:
A=(C1-C2)×V
Wherein, A indicates methylene blue adsorption value, C1Indicate methylene blue concentration before adsorbing, C2Indicate methylene blue after adsorbing
Concentration, V indicate liquor capacity.
3, the measurement of active sludge carbon iodine number
It takes 2mg iodine to be added in 1000mL water, is configured to the iodine solution that concentration is 2.0mg/L, is obtained not after dilution
With the iodine solution of concentration, on visible spectrophotometer, wavelength 595nm is selected, measures absorbance with the cuvette of 2cm, and make
Obtain standard curve.The active sludge carbon of 0.1g is added, in perseverance in same above-mentioned steps in the iodine solution that 100mL concentration is 2.0mg/L
On warm oscillator, 10min is vibrated at a temperature of 20 DEG C, stands the absorbance of survey solution after 10min, and reference standard curve obtains
Iodine concentration value.Referring to the concentration that iodine in the solution of active carbon front and back is added, the size of active carbon iodine number is calculated.Calculation formula is as follows
It is shown:
D=(C3-C4)×V
D indicates iodine sorption value, C3Indicate iodine concentration before adsorbing, C4Indicate iodine concentration after adsorbing.
4, activated carbon specific surface area and average pore size measurement
Sample after dried is weighed 2mg or so, is put into specific surface area and aperture tester, by instrument monitoring,
Directly obtain the value in specific surface area and aperture.
5, RXD is tested
Dried active sludge carbon sample is taken, fine particle is pulverized into, is put on the micro slide of x ray diffractometer x, start
Diffractometer obtains related data, then makes figure.
6, scanning electron microscope is tested
Sample after dried is put into scanning electron microscope instrument, by selecting different visual angles, suitable view of taking pictures out.
7, it discusses
It is found by above-mentioned experiment, during excess sludge produces active carbon, activator concentration, carbonization temperature and charing
Time influences maximum to the performance of active carbon, and the flow effect of heating rate, activation time, activated gas is relatively small.Institute
With test uses the mass ratio of activator and dewatered sludge for 5:1, and activation time is that for 24 hours, heating rate is 20 DEG C/min, protection
When gas flow is 2.5L/min, changes activator concentration, carbonization temperature and carbonization time, produce active sludge carbon, and survey it
Yield, methylene blue and iodine number find out the best work that sludge produces active carbon by the variation of yield, methylene blue and iodine number
Skill condition.
7.1, the influence of carbonization time, carbonization temperature and activator concentration to yield
When Fig. 1 (a)-(d) is respectively 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C under difference activator concentration carbonization time to
The influence schematic diagram of rate.
It will be seen from figure 1 that carbonization temperature is at 400 DEG C -700 DEG C, carbonization time is in 30min-70min, with charcoal
Change the raising of temperature, the lengthening of carbonization time, active carbon yield gradually decreases.Temperature is in 400 DEG C and 500 DEG C, in bagasse
Organic matter do not carbonized completely so that active carbon yield is high, and activator concentration is higher, and the energy of activator absorption is also got over
It is more, so that more organic matters are not carbonized, further such that the yield of active carbon is got higher.Carbonization temperature is at 600 DEG C, charcoal
When changing 60min or less, the yield of active carbon is higher, and with the raising of activator concentration, the yield of active carbon increases.And work as charcoal
During the change time gradually increases, yield is more complex with the variation of activator concentration, and concentration is when 3.0mg/L carbonizes 60min
Yield is larger, and as shown in Fig. 1 (c), after being more than, value reduces comparatively fast.
Illustrate carbonization time in 60min or less, since carbonization time is shorter, excess sludge fails to carbonize completely, with
The raising of activator concentration, the energy for being activated agent absorption is more, so charing is more not thorough.It is living when time reaches 60min
When agent concentration is low, yield is lower, but when concentration is higher, when reaching 4.0mg/L, activator absorption portion of energy, in sugarcane
After the completion of slag charing, the energy of activator absorption releases again again, and the further charing to active carbon, yield is lower,
And in 3.0mg/L, activator both meets the effect of organic matter in protection excess sludge, make that organic matter will not be excessive by charcoal
Change, and can sufficiently be combined with organic matter, reaches good activation effect, under the moderate time, thoroughly carbonize organic matter,
And without carbonaceous loss caused by excessively carbonizing, so yield is higher.After time reaches 70min, excess sludge is due to absorbing
A large amount of energy and partial ablation, active carbon yield are lower.And when temperature reaches 700 DEG C, yield value is relatively low, and with
The reduction of activator concentration and be reduced to extremely low level, such as Fig. 1 (c)-(d).When the time is in 70min, different activation
Under agent concentration, yield value all tends to be extremely low, and only 10%, at this point, influence of the variation of activator concentration to yield very little.
7.2, the influence of carbonization time, carbonization temperature and activator concentration to methylene blue
When Fig. 2 (a)-(d) is respectively 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C under difference activator concentration carbonization time to Asia
The influence of methyl blue adsorptive value.
Figure it is seen that absorption shadow of the concentration of carbonization temperature, carbonization time and activator to active carbon methylene blue
Sound is more complex, and when carbonization temperature is 400 DEG C and 400 DEG C, with the increase of carbonization time, the adsorbance of methylene blue is totally presented
Increasing trend, when the concentration of activator is 3mol/L ratio, the adsorptive value of methylene blue is relatively high, and adsorption effect is preferable.With
The increase of temperature, after temperature reaches 600 DEG C, carbonization time 50min-60min, when activator concentration is 3mol/L, methylene
The adsorptive value of base indigo plant reaches maximum value, is 390mg/g.When temperature is lower, methylene blue adsorption value is smaller, with the liter of temperature
Height, methylene blue value are gradually increased, and after temperature reaches 600 DEG C, the adsorptive value of methylene blue reaches maximum value.Temperature continues to increase
Add, the adsorptive value of methylene blue is gradually reduced.Influence of the activator to methylene blue is more complex, and when temperature is lower, concentration is got over
Height, carbonization time is shorter, and methylene blue adsorption value is smaller, and when temperature is higher, activator concentration is higher, and carbonization time is longer,
Value reduces faster.This is because activator concentration is higher when temperature is too low, energy not enough all carbonizes organic matter, part energy
Amount can also be activated agent absorption, and charing is not thorough enough, fail to be converted to carbonaceous there are a part of organic matter, absorption property is not high.
As the temperature rises, activator role is more and more obvious, and when temperature is 600 DEG C, activator can be to the greatest extent
It is combined with the organic matter in active sludge carbon, and acts on energy uniformly on organic matter, reach optimal charred effect, led to
Normal activator concentration preferably chooses 3mol/L.Activator concentration is too low, and activator cannot react to the greatest extent with organic matter,
It cannot absorb effective energy, official's priming reaction relatively mitigates, guarantee optimal activation effect, and excessive concentration, activator absorption
Portion of energy, when carbonizing oneself through completing, activator discharges the energy of absorption again again and leads to the ablation of organic matter, makes
The effective component of active carbon is reduced, and methylene blue adsorption value is reduced.It is also concluded that from test.When the temperature is excessively high,
After reaching 700 DEG C, a large amount of energy direct ablation part organic matter makes it be converted into ash content, in the active carbon obtained in this way
Carbonaceous ingredient is less, so adsorbance is little.At such a temperature, the influence of activator can be ignored substantially.
So it is 600 DEG C that optimal conditions, which are in carbonization temperature, the concentration of carbonization time 50-60min, activator are
3mol/L, the active sludge carbon performance obtained under this condition are best.
7.3, the influence of carbonization time, carbonization temperature and activator concentration to iodine number
Influence of the carbonization time to iodine number under difference activator concentration when Fig. 3 is 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C.
As can be seen that influence of the carbonization temperature to iodine number is very big from Fig. 3.When temperature is lower and higher, iodine number is lower.
This is because when the temperature is low, charing is not thorough, when temperature is higher, and excessively it is carbonized, causes matrix charcoal part ablated,
Pore structure is destroyed, and iodine number is relatively low.When carbonization temperature is at 400 DEG C -500 DEG C, carbonization time in 30-60min, with
The extension of carbonization time, the increase of activator concentration, iodine number are gradually increased.After temperature is greater than 600 DEG C, with carbonization time
Extend, the increase of activator concentration, iodine number decline.When temperature is 500 DEG C -600 DEG C, activator concentration is 3.0mol/L, iodine
Value reaches maximum value 510mg/g.
For the experimental result of complex chart 3 it is found that temperature is lower, carbonization time is shorter, and active carbon iodine number is lower.Temperature compared with
Low, in the case that carbonization time is shorter, activator concentration is higher, and iodine number is lower.This is because being lower than 500 DEG C, when charing in temperature
Between when being less than 50min, the organic matter in activated sludge does not carbonize completely, and part exists also in the form of Organic carbon, it is some not
Stable volatile organic matter is also scattered in the pore structure of active carbon, and when activator concentration is higher, the energy absorbed is got over
More, the charred effect of organic matter is poorer, so the active carbon iodine number obtained under the conditions of this is small.When temperature reaches 700 DEG C, charcoal
Change after the time reaches 70min, high temperature makes organic carbon by a large amount of ablation coking, keep iodine number relatively low, in such temperature and
Under time conditions, activator concentration is bigger, and iodine number is lower.This is because the cementing pore structure in active carbon of the activator of high concentration
In, the generation of pore structure is hindered, and activator heat dissipation is slow, the later period is made in active carbon, activator can release the heat of absorption
It releases, further coke activity charcoal, so that the yield and iodine number of active carbon further decrease.And in temperature at 500 DEG C -600
DEG C, for carbonization time in 50min-60min, yield and iodine number relatively all preferably, meet production requirement.It also can know that in figure
When activator concentration is in 3.0mol/L, yield and iodine number are higher, this is because moderate carbonization temperature, carbonization time and
Activator concentration ensure that in sludge organic principle to greatest extent with activator hybrid reaction, under the action of protective gas,
Under moderate moisture, with the lengthening of carbonization time, the chemical combination charcoal in excess sludge is gradually transformed into simple substance charcoal, and some volatilizations
Property organic matter be discharged with protective gas, will not because these organic matter coking generate tar block active carbon hole.Pass through
The test of iodine number, it is 3.0mol/L, the matter of activator and dewatered sludge that the more excellent process conditions of preparing active carbon, which are in activator concentration,
For amount than being 5:1, activation time is that for 24 hours, carbonization temperature is 600 DEG C, carbonization time 60min, shield gas flow rate 2.5L/
min。
Active sludge carbon yield obtained is 37.2% under this condition, and methylene blue value is 390mg/g, and iodine number is
385mg/g。
7.4, specific area measuring
In order to analyze active sludge carbon internal structure change situation, according to above-mentioned experimental result, iodine number highest is chosen
(510mg/g), the biggish sample of yield do specific area measuring test, obtain that the results are shown in Table 2.
Table 2
7.5, XRD diffraction
Similarly, according to above-mentioned experimental result, iodine number highest (510mg/g) is chosen, the biggish sample of yield does XRD reality
It tests, gained map is as shown in Figure 4.
As can be seen from Figure 4, when the angle of diffraction 2θBetween 25 ° -30 °, diffraction curve has a particularly apparent absorption peak, explanation
Excess sludge after activation charing has a crystalline form determined, and different organic matters forms active sludge carbon in excess sludge.And
Absorption peak is higher in figure, it is known that charred effect is preferable.
7.6, electron-microscope scanning
According to above-mentioned experimental result, iodine number highest (510mg/g) is chosen, the biggish sample of yield does electron-microscope scanning.Fig. 5 and
Fig. 6 is the SEM image under different magnification ratios.
From figs. 5 and 6, it can be seen that charing after excess sludge in contain a large amount of aperture.In 3200 times of mirror of amplification
As in, as shown in Figure 5, it is seen that there are many pores on surface, and the discrete distribution of this some holes is on the activated carbon.After 8000 times of amplification
In Fig. 6 it can be seen that, also contain inside the macropore of activated carbon surface there are many tiny micropore, entire active carbon is vertical just as one
The mesh screen of body.Internal huge pore structure necessarily has the characteristics that absorption property is big.
8, conclusion
Under high temperature action, organic matter and intramolecule water phase interaction in activator and activated sludge inhibit in this way
The formation of carbon containing volatile matter and tar, prevents from blocking its pyrogenous origin pore by tar, furthermore activator has erosion to carbon
Effect makes to form mushy structure inside active carbon.When being passed through protective gas N under high temperature2When, gas flows in charcoal gap
It is dynamic, the air in gap is discharged, it is inorganic between making the gas that gap reaches few oxygen, the environment of anaerobic is passed through that can also remove carbon crystal
Carbide and disordered carbon etc., so that formation is more and structure is more stable, the better hole of shape.
Using the technique active sludge carbon carbonized afterwards is first activated, optimal active carbon reparation technology condition is carbonization temperature
It is 600 DEG C, carbonization time 60min, is 3.0mol/L in activator concentration, bagasse active carbon iodine number obtained is
510mg/g, yield 35.4%, specific surface area 436m2/ g, average pore size 24.2nm, pore volume 7.1*10-2cm3·g-1。
The holes of products obtained under this condition is clear in structure, and intensity is high, and stability is good.Activity obtained in embodiment 1
Charcoal can satisfy requirement of the wastewater treatment to the intensity and performance of active carbon.
For those skilled in the art, it can be provided various corresponding according to above technical solution and design
Change and modification, and all these change and modification, should be construed as being included within the scope of protection of the claims of the present invention.
Claims (4)
1. a kind of method for preparing active carbon using sludge, which comprises the steps of:
S1, dewatered sludge is added in activator, natural immersion activates after mixing；Wherein, activator is the ZnCl of 3.0mol/L2It is molten
The mass ratio of liquid, dewatered sludge and activator is 1:5；
After the completion of S2, activation, centrifugal dehydration；
S3, the dewatered sludge after centrifugal dehydration is put into tubular type Muffle furnace, charcoal is distinguished under conditions of being passed through protective gas nitrogen
Change 60min, obtains semi-finished product active carbon；Carbonization temperature is 600 DEG C；
S4, semi-finished product active carbon is first cleaned with hydrochloric acid, then is in neutrality wash with distilled water to washing lotion, centrifugal dehydration places into
12h is dried in baking oven to 103 DEG C -105 DEG C, obtains final active sludge carbon finished product.
2. the method according to claim 1 for preparing active carbon using sludge, which is characterized in that in step S1, when activation
Between for for 24 hours.
3. the method according to claim 1 for preparing active carbon using sludge, which is characterized in that in step S3, protect gas
Body flow is 2.5L/min.
4. the method according to claim 1 for preparing active carbon using sludge, which is characterized in that in step S3, with 20 DEG C/
The heating rate of min is warming up to 600 DEG C of carbonization temperature.
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| CN106732379A (en) * | 2017-02-23 | 2017-05-31 | 华南理工大学 | A kind of sludge-based activated carbon with efficient absorption PFOS and PFOA efficiency and preparation method and application |
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Application publication date: 20190927 |