CN111995063A - Powdered activated carbon carrier and preparation method and application thereof - Google Patents
Powdered activated carbon carrier and preparation method and application thereof Download PDFInfo
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- 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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Abstract
The invention belongs to the technical field of sewage treatment, and provides a powdered activated carbon carrier, and a preparation method and application thereof. The powdered activated carbon carrier comprises 2.8-3.0% of water by mass, 11.8-12.2% of ash by mass, 954-984 mg/L of iodine value and 850-855 m of specific surface area2(ii) a bulk density of 0.54 to 0.59g/cm3The pH value is 6.8-8.5, and the mass of the active carbon particles with the particle size of 200-325 meshes in the powdered active carbon carrierMore than or equal to 80 percent. The powdered activated carbon carrier can be directly added, is simple to operate, and has long service life, low price and wide application range; the powdered activated carbon carrier has a large specific surface area, so that the number of fixed microorganisms is large, and when the powdered activated carbon carrier carrying COD degrading bacteria is added into wastewater with high COD content, an excellent treatment effect is obtained.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a powdered activated carbon carrier, a preparation method of the powdered activated carbon carrier, and application of the powdered activated carbon carrier in sewage treatment.
Background
With the rapid development of economic society, a large amount of domestic and production wastewater is generated every day, and if the wastewater is not treated in time, the wastewater can directly or indirectly harm the environment and the human health. At present, the wastewater treatment has physical, chemical and biological treatment technologies. Among them, the biological sewage treatment technology is becoming the core technology in the field of sewage treatment due to its safety and economic characteristics, and is popular with sewage treatment engineers.
The biological treatment technology is a method for decomposing, absorbing or transferring pollutants by utilizing specific microbial strains so as to achieve advanced sewage treatment. The immobilized microorganism technology is a novel biological treatment technology, free specific bacteria and active enzyme are fixed on certain carriers by physical or chemical means, original biological activity is kept, meanwhile, microorganisms are highly concentrated, the number of the microorganisms in a bioreactor can be increased, and sewage is treated more effectively. Compared with free bacteria in sewage, the carrier immobilized microorganism can be rapidly propagated in a large quantity, and has the advantages of high microbial activity, no secondary pollution and the like.
The immobilization technology of microorganisms, also called bio-synergy technology, mainly includes several methods such as adsorption immobilization, cross-linking immobilization, embedding immobilization, and the like.
The cross-linking immobilization method is an immobilization technique in which a surface group of a microorganism and a chemical cross-linking agent or the microorganism itself undergo a cross-linking reaction to form a covalent bond or the microorganism itself forms particles by utilizing the self-flocculation ability of the microorganism by using a chemical or physical means. The method has great influence on the activity of microorganisms, and most chemical cross-linking agents are expensive and cannot be applied in a large scale.
The embedding and fixing method is simple and convenient to operate, and utilizes the high-molecular hydraulic material or water-soluble monomer to polymerize and form gel so as to embed the microorganisms. The method has little influence on the activity of the microorganisms, but the network structure of the hydrogel can block the mass transfer effect among immobilized microorganisms, and the hydrogel has poor impact resistance, short service life, high price and treatment cost and limited application.
Among them, the surface adsorption immobilization method is a method in which microorganisms are adsorbed and immobilized on the surface of a carrier, and the biofilm method is the most representative example in water treatment. The method is simple to operate, has small influence on the activity of the microorganisms, but has very limited fixed microorganism quantity, and cannot achieve ideal sewage treatment effect. So far, no ideal microorganism immobilization carrier or method has been found.
In the prior art, the strain immobilization carrier is generally a natural carrier (such as pine needle, bran, zeolite, and the like) or a synthetic carrier (such as polyester sponge, activated carbon, and the like) or a composite carrier (such as a natural composite carrier and a synthetic composite carrier, and the like).
The treatment effect of the microbial inoculum containing the same strain prepared by different carriers is different. For example, Zhang Wen Yanjun, Wangjianing, etc.; preparation of biochar immobilized petroleum degradation bacteria agent [ J ]. Jiangsu agricultural science, 2015,43(06):341 and 345) uses pine needles, corncobs and grasses as precursors to prepare biochar carriers to immobilize petroleum degradation bacteria, and finds that the bacteria degradation effect using biochar as the carrier is better than the bacteria agent using the precursors (pine needles, corncobs and grasses) as the carrier. And the activated carbon and the bacillus are embedded by Bao Teyi et al (Bao Teyi, Tian Yan Ming, Chen Qing nationality; research on the treatment of oily wastewater by sodium alginate embedded immobilized microorganisms [ J ]. environmental science and technology, 2012,35(2): 167-. For another example, Zhang Jianmin et al (Zhang Jianmin, Yankeelong, Chenxi, Jiebao; preparation and degradation performance of modified carrier immobilized petroleum degrading bacteria [ J ]. basic science of textile university, 2018,31(03): 378-plus 385) use attapulgite, diatomite and montmorillonite natural carriers to compare with modified carrier immobilized bacteria, and find that the effect of degrading and removing oily wastewater by the attapulgite immobilized bacteria modified by alkali first and then acid first is the best and reaches 48.96%.
In the technical field of sewage treatment, activated carbon is a novel strain carrier material, is convenient to use, has small harm to microbial activity, has rich internal void structures and higher specific surface area, and is very easy to adsorb various strains.
However, the effect of the carrier for carrying microbial strains provided in the prior art on sewage treatment is not ideal, and the following technical defects often exist: the operation is complex, the service life is short, and the cost is high.
Disclosure of Invention
The invention aims to provide a novel carrier for bearing COD degrading bacteria, which aims to solve the technical problem that the sewage treatment effect of the existing carrier used by microbial strains is not ideal, and provides a carrier material with low price, safe use and long service life for fixing the strains, thereby meeting the requirements of various sewage treatment projects.
To this end, the first aspect of the present invention provides a powdered activated carbon carrier (herein abbreviated as PAC) which is black or brown in color, which can be used to load various qualities of COD degrading bacteria thereon at the time of use, with respect to the quality of wastewater being specifically treated. The powdered activated carbon carrier has a large specific surface area, is very easy to adsorb microorganisms, has almost no harm to the activity of the microorganisms, and can be directly added when in use.
The powdered activated carbon support of the present invention is characterized by the following properties: the mass percent of the water of the powdered activated carbon carrier is 2.8-3.0%, the mass percent of the ash content of the powdered activated carbon carrier is 11.8-12.2%, the iodine value of the powdered activated carbon carrier is 954-984 mg/L, and the specific surface area of the powdered activated carbon carrier is 850-855 m2The bulk density of the powdered activated carbon carrier is 0.54 to 0.59g/cm3The pH value of the powdered activated carbon carrier is 6.8-8.5, and the mass of activated carbon particles with the granularity of 200-325 meshes in the powdered activated carbon carrier is more than or equal to 80 percent.
Preferably, the powdered activated carbon carrier has a moisture content of 2.9% by mass, an ash content of 12% by mass, an iodine value of 984mg/L, and a specific surface area of 852m2(ii)/g, the bulk density of the powdery activated carbon carrier is 0.57g/cm3The pH value of the powdered activated carbon carrier is 7.0-8.4, and the powderParticle size in the powdered activated carbon carrier>The mass of the active carbon particles of 200 meshes is more than or equal to 90 percent.
Wherein, the water content is 2.9 percent and is far less than 10 percent required by the test standard GB/7702.1-2008, thereby increasing the specific surface area of the activated carbon carrier and further increasing the contact area with COD degrading bacteria.
The ash content is 12 percent and is less than 15 percent specified by GB/7702.15-2008 test standard, so the low ash content causes the inorganic matters contained in the ash to have small adverse effects on activated carbon pore-forming and microorganism adsorption.
Wherein, the iodine value is 984mg/L and is more than 900 specified by GB/7702.7-2008 inspection standard; as is well known, the iodine value is a measure of the equilibrium mass of iodine that is excessively adsorbed on the surface of activated carbon, which is a good indicator of the availability of activated carbon in very small/high density pores; the amount of adsorbed iodine correlates with the increased porosity of the activated carbon, with higher iodine numbers indicating greater adsorption capacity of the activated carbon.
Wherein the specific surface area is 852m2The/g is larger than 800 specified in GB/7702-; because of its large specific surface area, it can adsorb more COD-degrading bacteria. Similarly, the larger the mesh number, the smaller the particle size of the activated carbon particles, resulting in a large contact area and a good adsorption effect.
Wherein the pH is neutral to weakly alkaline, and is suitable for most strains to survive, for example, the pH can be 7, 7.3, 7.6, 7.8, 8.1, 8.4.
In a second aspect of the present invention, there is provided the method for producing a powdered activated carbon support according to the first aspect, specifically comprising the steps of:
s1: crushing raw material coal, sequentially grinding, drying and sieving to form coarse coal powder, and then heating and carbonizing to obtain carbonized coal powder;
s2: carrying out activation treatment on the carbonized coal powder to form an activated material; wherein CO is used2As a gas activator;
s3: and grinding and screening the activated material to obtain the powdered activated carbon carrier.
The preparation method is to crush the raw material coal without special requirements, and the crushing method familiar to the technical personnel in the field can be adopted, and the preparation method is preferably carried out in a jaw crusher.
Wherein the milling treatment has no special requirements, and can be performed by a milling method familiar to those skilled in the art, preferably in a Ramon activated carbon mill.
Wherein, the activation equipment used for the activation treatment is preferably a Silipap activation furnace.
In addition, the raw material coal adopted by the preparation method is simple and easy to obtain and can be recycled, so that the preparation of the activated carbon by using mineral substances to replace biomass raw materials is realized.
Preferably, in step S1 of the preparation method, the pressure of the heating and carbonizing treatment is 80-100KPa, the temperature of the heating and carbonizing treatment is 200-500 ℃, and the temperature rising rate of the heating and carbonizing treatment is 3-5 ℃/min. Wherein, the heating rate is the rate of heating from the ambient temperature to 200-500 ℃. In the step, carbonization is used for evaporating water in the coarse coal powder and accelerating the combustion of volatile substances on the surface of the coarse coal powder to preliminarily form surface pore-forming.
Preferably, in step S2 of the above preparation method, the flow rate of the gas activating agent is 2L/min, and the temperature of the activation treatment is 950 ℃. It is worth to say that the carbonized coal powder is corroded and forms a developed pore structure after the activation reaction of the gas activating agent, and the preparation method adopts CO2As a gas activator, CO at the same activation temperature2The activation energy of the reaction with the carbonized coal powder is higher, and the activation process is controlled by chemical reaction, so the pore-forming rate is slower, and the pore distribution is more uniform.
Preferably, in step S3 of the above preparation method, the sieving treatment is filtration using a 200-mesh sieve.
The powdery active carbon carrier prepared by the preparation method has almost no harm to the activity of microorganisms, has high use safety and can be directly added; and special protection measures are not needed, so that the capital investment is saved.
In a third aspect of the present invention, there is provided a use of the carrier for powdered activated carbon according to the first aspect in sewage treatment, comprising:
firstly, compounding the powdery active carbon carrier with COD degrading bacteria, and then adding the compound into a sewage treatment process system for reducing COD.
It is worth supplementing to note that the COD degrading bacteria are derived from natural extraction or are commercially available products, for example, the COD degrading bacteria can be a mixed bacteria containing a combination of various bacilli and pseudomonas aeruginosa, and the mixed bacteria is solid and has the amount of more than or equal to 5000 cfu/g.
Preferably, in the application of the powdered activated carbon carrier in sewage treatment, the mass ratio of the powdered activated carbon carrier to the COD degrading bacteria is 1: 4-1: 6.
further preferably, the mass ratio of the powdered activated carbon carrier to the COD-degrading bacteria is 1: 5.
preferably, the powdered activated carbon carrier is used in sewage treatment, and the sewage treatment process system is selected from any one of the following: an activated sludge process system, an anoxic-aerobic process system, an anaerobic-anoxic-aerobic process system, a periodic cycle activated sludge process system, and a sequencing batch activated sludge process system.
Compared with the prior art, the invention has the following technical advantages:
compared with microorganism fixing carriers such as high polymer hydraulic materials and micro-capsules, the powdered activated carbon carrier provided by the invention can be directly added, and has the advantages of simple operation, long service life, low price and wide application range. In addition, the powdered activated carbon carrier of the present invention has a large specific surface area and a large number of meshes, compared to a biofilm formed by the self-growth of microorganisms, and thus the number of immobilized microorganisms is large. Therefore, when the powdered activated carbon carrier carrying COD-degrading bacteria is added to wastewater with high COD content, excellent treatment effect is obtained. In addition, the preparation method of the powdered activated carbon carrier provided by the invention is easy to implement and has lower cost.
In conclusion, the powdered activated carbon carrier and the preparation method thereof have wide market prospects in the field of sewage treatment.
Drawings
FIG. 1 is a graph showing the change of COD concentration with time in the process of degrading wastewater produced by PCB production by using composite strains prepared by compounding COD degrading bacteria with the same mass and carriers of different types.
FIG. 2 is a graph showing the change of COD removal rate with time in the process of degrading coking wastewater by using a composite strain prepared by compounding COD degrading bacteria with the same mass and carriers of different types.
FIG. 3 is a graph showing the change of COD concentration with time in the process of degrading municipal wastewater by using a composite strain prepared by compounding COD degrading bacteria with the same mass and carriers of different types.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples, but the present invention is not limited to the following examples. All the steps in the method are conventional steps if no special description is provided; the starting materials and the equipment can be obtained from public commercial sources without specific descriptions.
In a preferred embodiment, a powdered activated carbon carrier is provided, the powdered activated carbon carrier having a moisture content of 2.9% by mass and an ash content of 12% by mass, the powdered activated carbon carrier having an iodine value of 984mg/L and a specific surface area of 852 m/L2(ii)/g, the bulk density of the powdery activated carbon carrier is 0.57g/cm3The pH value of the powdered activated carbon carrier is 7.6, and the particle size of the powdered activated carbon carrier is 7.6>The mass of the active carbon particles of 200 meshes is more than or equal to 90 percent.
In a preferred embodiment, a powdered activated carbon support is prepared by the following steps:
s1: crushing raw material coal, sequentially grinding, drying and sieving to form coarse coal powder, and then heating and carbonizing to obtain carbonized coal powder;
s2: carrying out activation treatment on the carbonized coal powder to form an activated material; wherein CO is used2AsA gas activator;
s3: and grinding and screening the activated material to obtain the powdered activated carbon carrier.
Wherein, due to the heating and carbonizing treatment in S1, the water content of the coarse coal powder is largely evaporated; the presence of moisture can occupy the activated sites of the activated carbon, and the adsorption performance of the activated carbon is influenced; the powdered activated carbon prepared according to the step has small water content and a large number of micropores on the surface of the carrier, and can increase the contact area between the activated carbon and the COD degrading bacteria added subsequently, thereby adsorbing more COD degrading bacteria.
Wherein, some inorganic matters contained in the ash are oxidized in the heating and carbonizing treatment process in S1 to preliminarily form surface pore-forming, so that the content of the ash is successfully reduced, and the adverse effects of the inorganic matters contained in the ash on activated carbon pore-forming and microorganism adsorption are avoided; in addition, certain alkali metal compounds contained in the ash are retained, trace elements required for the growth of microorganisms can be provided, and the activity of the microorganisms is enhanced.
Wherein, because S1 and S3 sieve many times, obtained the powdered activated carbon carrier granule that the particle size is littleer, feel is more exquisite, COD degradation flora can be evenly distributed on the granule, more do benefit to and combine with the pollutant in the sewage, show and improve COD and get rid of efficiency.
In S2, the physical activation mode implemented by a gas activating agent is adopted, and activating agents such as alkali solution and the like are not added, so that the influence on the pH value of the carbonized coal powder is small; the neutral to alkalescent environment obtained by the method is suitable for the survival of most strains, and can effectively reduce the loss of the number of microorganisms caused by carrier peracid or overbase in the loading process.
And CO is selected as the gas activator in S22Gas promotes the activation reaction to be slowly and effectively carried out, and is more favorable for preparing the activated carbon with better adsorption performance, pore volume, specific surface area and microporous structure. Moreover, the larger specific surface area can adsorb some inorganic or organic pollutants in the sewage after being added into the sewage while adsorbing more microorganisms, and the inorganic or organic pollutants are discharged through the action of the microorganisms on the carrier or flocculation actionWater body, so that the degraded effluent is clearer.
In a further preferred embodiment, in step S1, the pressure of the heating and carbonizing treatment is 80-100KPa, the temperature of the heating and carbonizing treatment is 200-500 ℃, and the temperature rising rate of the heating and carbonizing treatment is 3-5 ℃/min.
In a further preferred embodiment, in step S2, the flow rate of the gas activator is 2L/min and the temperature of the activation process is 950 ℃.
In a further preferred embodiment, in step S3, the screening process is a 200 mesh screen.
In a preferred embodiment, the powdered activated carbon support is applied to sewage treatment, comprising:
firstly, compounding the powdery active carbon carrier with COD degrading bacteria, and then adding the compound into a sewage treatment process system for reducing COD. Wherein the COD degrading bacteria and the powdered activated carbon carrier bearing the COD degrading bacteria can be used for a sewage treatment system with high COD content and are suitable for various treatment processes, such as an activated sludge process, an anoxic-aerobic process (AO) and an anaerobic-anoxic-aerobic process (A)2O), cyclic activated sludge process (CASS), Sequencing Batch Reactor (SBR), etc. to solve the problems of high COD content in the inlet water, rich nutrients, anaerobic blackening of biochemical pond, lowered sludge activity, activated sludge swelling caused by excessive growth of bacterial micelle, etc.
In a further preferred embodiment, the mass ratio of the powdered activated carbon carrier to the COD-degrading bacteria is 1: 4.
in a further preferred embodiment, the mass ratio of the powdered activated carbon carrier to the COD-degrading bacteria is 1: 5.
in a further preferred embodiment, the mass ratio of the powdered activated carbon carrier to the COD-degrading bacteria is 1: 6.
the following detailed description of specific embodiments of the present invention is provided by way of example only and the present invention is not limited to the specific embodiments described below. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Example 1
This example provides a powdered activated carbon support (PAC) having a moisture content of 2.9%, an ash content of 12%, an iodine value of 984mg/L, and a specific surface area of 852m2(ii)/g, having a bulk density of 0.57g/cm3The pH value is 8.1, wherein the particle size is>The mass of the active carbon particles of 200 meshes is more than or equal to 90 percent.
Compounding PAC and COD degrading bacteria, and the specific process comprises the following steps:
1kg of PAC was slowly added into a container containing 5kg of COD degrading bacteria (bacterial liquid) to obtain a mixed solution, wherein the COD degrading bacteria used in the embodiment are from Prolo biotechnologies (Shanghai) Co., Ltd. And then, putting the mixed solution on a mechanical stirring table, setting the stirring speed at 200rpm and the stirring temperature at 25 ℃, fully stirring for 48 hours, uniformly mixing the COD degrading bacterium solution and the PAC, and sealing and storing for later use (namely the powdery active carbon carrier carrying the COD degrading bacterium, which is referred to as the composite strain in the text for short).
Application example 1
The sewage is taken from a secondary materialization tank of wastewater of a certain PCB production enterprise to treat the same batch of effluent, and is respectively placed in a small test device of a 10L volume activated sludge method, and the treatment process is as follows: hydrolysis acidification, anaerobic treatment (1h) and aerobic treatment (3h), wherein the pilot plant operates according to the residence time of a sewage plant, the water inflow is 6L/d, the aeration rate of the anoxic tank is less than or equal to 0.5mg/L, and the aeration rate of the aerobic tank is 2-5 mg/L. Respectively adding composite strains compounded by COD degrading bacteria with the same mass and carriers of different types into the anoxic pond, wherein the mass ratio of the COD degrading bacteria to the carriers is 1: the compounding procedure was the same as in example 1. Accordingly, COD concentration of the effluent of the aerobic tank corresponding to different carriers is recorded, and COD removal rate is calculated, and specific results are shown in figure 1.
As can be seen from the analysis of FIG. 1, after the PAC carrying COD degrading bacteria provided in example 1 is used for the treatment of wastewater generated in PCB production, the COD removal rate in the later stage sewage is as high as 90% after the earlier stage strains are adapted to the wastewater, the COD content in the effluent of the secondary physicochemical treatment is reduced from about 300mg/L to 30mg/L, and the removal effect is excellent. Compared with the situation that the PCB production wastewater is treated by adopting the composite strain with columnar activated carbon (GAC) and bran as carriers, the COD removal rate in the stabilization period is about 60 percent, and the treatment effect is poor.
Analysis shows that when GAC is thrown into sewage, COD is removed mainly through adsorption, and the subsequent COD content slightly rises and has certain relation with desorption. Although bran as a natural substance has a large specific surface area, the bran is more like a nutrient substance to microorganisms originally existing in a water body when being thrown into water, the mass is observed to be reduced after a period of time, and the response rate is lower than that of PAC.
On the one hand, due to the specific surface area of PAC (852 m)2/g) larger than GAC and bran, adsorbing more microorganisms; on the other hand, PAC itself can also adsorb and gather the original microorganisms and organic matters in the sewage, so that the final COD removal rate is higher. In addition, the specific surface area of the commercially available activated carbon was smaller than that of the PAC prepared in example 1, and the commercially available activated carbon was chemically activated, and the pH was strongly basic, which made it difficult for microorganisms to survive. Therefore, the PAC provided in example 1 is loaded with more microorganisms and has stronger activity, and can further improve the activity and diversity of microorganisms, resulting in higher COD removal rate.
Application example 2
The same batch of water is taken from an aerobic pool of a certain coking plant, the water is respectively placed in 1L beakers, the aeration amount is controlled to be 2-5mg/L, the pH value is adjusted to be about 7.0, the composite strains compounded by COD degrading bacteria and different carriers with the same mass are added into the beakers, the supernatant COD concentration is measured by sampling and filtering every day, the COD removal rate is recorded, and the specific result is shown in figure 2.
As shown in fig. 2, the COD removal effect obtained by using PAC carrying COD degrading bacteria provided in example 1 for the treatment of coking wastewater was the best, and the COD removal rate reached 80% within two weeks.
The coking wastewater has high raw water COD and sulfide content, can impact the primary strains in the activated sludge, and can also have certain influence on the properties of the carrier. PAC granularity graduations are uniform, wherein the mass of activated carbon particles with granularity and mesh number larger than 200 meshes is larger than or equal to 90 percent, and after COD degrading bacteria are loaded, the activated carbon particles are thrown into coking wastewater to realize uniform dispersion, so that the reaction rate of microorganisms and organic matters is accelerated; some of the 12% ash components contained in PAC may also act as catalysts for microorganisms to use organic matter for life activities. As can be seen from the comparison, the removal rate of the COD corresponding to PAC is significantly improved compared to the use of the other two carriers, which proves that the PAC provided in example 1 can still achieve an excellent COD removal effect under a high COD wastewater quality.
Application example 3
Respectively taking a proper amount of municipal sewage (the same batch of sewage), respectively placing the municipal sewage into a sequencing batch activated sludge process pilot plant with the volume of 10L, carrying out aerobic biochemical reaction according to the retention time of an aerobic pool of a sewage plant, and then carrying out anoxic reaction (the retention time is 2 h). Respectively adding the composite strains compounded by the COD degrading bacteria with the same mass and different types of carriers, controlling the treatment time to be the same (2h), recording the COD concentration of the effluent of the SBR tank corresponding to different carriers, and calculating the COD removal rate, wherein the result is shown in figure 3.
As can be seen from the analysis of FIG. 3, when the municipal wastewater is treated by the SBR treatment process, the treatment effect of the system using PAC as the carrier is the best, the COD content of the effluent is kept stable at about 40mg/L after one week, and the removal rate of COD is obviously higher than that of the other two carriers. This demonstrates that the PAC provided in example 1 still achieves excellent COD removal at lower COD wastewater quality.
The present invention is illustrated by the above experiments to show the effect of the present invention, but the present invention is not limited to the industries represented by the above waste water, i.e., it is not meant to be effective only in treating electronic waste water, coking waste water, and municipal waste water. It should be understood by those skilled in the art that any modification of the present invention, equivalent replacement of the preparation steps of the product of the present invention and addition of auxiliary components, selection of specific modes, etc., are within the scope of the present invention.
Claims (9)
1. A powdered activated carbon carrier, characterized in thatThe mass percent of water is 2.8-3.0%, the mass percent of ash content of the powdered activated carbon carrier is 11.8-12.2%, the iodine value of the powdered activated carbon carrier is 954-984 mg/L, and the specific surface area of the powdered activated carbon carrier is 850-855 m2The bulk density of the powdered activated carbon carrier is 0.54 to 0.59g/cm3The pH value of the powdered activated carbon carrier is 6.8-8.5, and the mass of activated carbon particles with the granularity of 200-325 meshes in the powdered activated carbon carrier is more than or equal to 80 percent.
2. The powdered activated carbon carrier as claimed in claim 1, which has a moisture content of 2.9% by mass, an ash content of 12% by mass, an iodine value of 984mg/L and a specific surface area of 852 m/L2(ii)/g, the bulk density of the powdery activated carbon carrier is 0.57g/cm3The pH value of the powdered activated carbon carrier is 7.0-8.4, and the particle size of the powdered activated carbon carrier is 7.0-8.4>The mass of the active carbon particles of 200 meshes is more than or equal to 90 percent.
3. A method for the preparation of a carrier of powdered activated carbon as in claim 1, comprising the steps of:
s1: crushing raw material coal, sequentially grinding, drying and sieving to form coarse coal powder, and then heating and carbonizing to obtain carbonized coal powder;
s2: carrying out activation treatment on the carbonized coal powder to form an activated material; wherein CO is used2As a gas activator;
s3: and grinding and screening the activated material to obtain the powdered activated carbon carrier.
4. The method as claimed in claim 3, wherein in step S1, the pressure of the heating and carbonizing treatment is 80-100KPa, the temperature of the heating and carbonizing treatment is 200-500 ℃, and the temperature rising rate of the heating and carbonizing treatment is 3-5 ℃/min.
5. The production method according to claim 3, wherein in step S2, the flow rate of the gas activator is 2L/min, and the temperature of the activation treatment is 950 ℃.
6. The production method according to claim 3, wherein in step S3, the sieving treatment is filtration using a 200-mesh sieve.
7. Use of a carrier of powdered activated carbon as claimed in claim 1 in sewage treatment comprising:
firstly, compounding the powdery active carbon carrier with COD degrading bacteria, and then adding the compound into a sewage treatment process system for reducing COD in sewage.
8. Use of a powdered activated carbon carrier as in claim 7 in sewage treatment, wherein the mass ratio of the powdered activated carbon carrier to the COD degrading bacteria is 1: 4-1: 6.
9. use of a powdered activated carbon carrier as claimed in claim 7 in sewage treatment, wherein the sewage treatment process system is selected from any of the following: an activated sludge process system, an anoxic-aerobic process system, an anaerobic-anoxic-aerobic process system, a periodic cycle activated sludge process system, and a sequencing batch activated sludge process system.
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| CN115520973A (en) * | 2021-06-25 | 2022-12-27 | 神美科技有限公司 | Preparation method of biological activated carbon loaded with microbial inoculum |
Citations (37)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2143359A1 (en) * | 1971-04-02 | 1975-01-30 | Peabody Coal Co | METHOD OF MANUFACTURING ACTIVATED CHARCOAL USING A STOVE WITH WALKING GRATE |
| CA1000223A (en) * | 1972-06-15 | 1976-11-23 | Keith M. Bowling | Demineralisation of brown coal |
| GB1460499A (en) * | 1973-05-05 | 1977-01-06 | Bayer Ag | Production of strong active carbon mouldings |
| US4102812A (en) * | 1975-10-02 | 1978-07-25 | Laporte Industries, Limited | Production of carbon from coal granules prepared in a fluid energy mill |
| RU2051097C1 (en) * | 1992-11-25 | 1995-12-27 | Уральский Научно-Исследовательский Химический Институт Научно-Производственного Объединения "Кристалл" | Method of activation of carbonized materials |
| CN101417193A (en) * | 2008-11-07 | 2009-04-29 | 江苏正本净化节水科技实业有限公司 | Nano crystallite composite filter material and supplement of manufacture method thereof |
| CN101423211A (en) * | 2008-11-14 | 2009-05-06 | 兖矿集团有限公司 | Technique for producing active carbon by extraction of coal fines |
| CN101503191A (en) * | 2009-03-13 | 2009-08-12 | 北京化工大学 | Method for preparing honeycomb active carbon from coal and coal tar |
| CN102126722A (en) * | 2010-01-20 | 2011-07-20 | 神华新疆能源有限责任公司 | Process for preparing coal-based agglomerated activated carbon |
| CN102583373A (en) * | 2012-02-13 | 2012-07-18 | 西安三瑞实业有限公司 | Method for preparing active carbon by using coal |
| CN102614854A (en) * | 2012-03-31 | 2012-08-01 | 复旦大学 | Method for preparaing dephosphorized and ferrum-carried activated carbon adsorbent |
| CN102633401A (en) * | 2011-02-15 | 2012-08-15 | 上海集策膜技术工程有限公司 | Biological treatment process technology for MBR (Meane Biological Reactor) membrane of engineering bacteria fed by using activated carbon as carrier |
| CN102674343A (en) * | 2012-04-01 | 2012-09-19 | 淮北市大华活性炭有限公司 | Production method for activated carbon |
| CN103496699A (en) * | 2013-10-21 | 2014-01-08 | 哈尔滨工业大学 | Preparation method for modified activated carbon |
| CN103588202A (en) * | 2013-11-18 | 2014-02-19 | 曹南萍 | Manufacturing method for active carbon/tourmaline composite material and product manufactured according to manufacturing method |
| CN103896268A (en) * | 2014-04-08 | 2014-07-02 | 山东大学 | Method for preparing multistage-aperture activated carbon with high specific surface area |
| CN104073276A (en) * | 2013-03-29 | 2014-10-01 | 宁波互联聚能环保技术有限公司 | Drying, carbonizing and activating integrated method and equipment for solid carbon-containing substances |
| CN104383968A (en) * | 2014-12-07 | 2015-03-04 | 富阳鸿祥技术服务有限公司 | Preparation method of titanium oxide-sepiolite-active carbon composite carrier |
| CN104822632A (en) * | 2012-11-30 | 2015-08-05 | 通用电气公司 | Produced water treatment to remove organic compounds |
| CN105314632A (en) * | 2014-07-18 | 2016-02-10 | 福建省荔元活性炭实业有限公司 | Processing technology for active carbon |
| CN105923907A (en) * | 2016-05-31 | 2016-09-07 | 北京国电富通科技发展有限责任公司 | Coal chemical industrial wastewater treatment system and treatment process |
| CN106185926A (en) * | 2016-07-15 | 2016-12-07 | 宋玉琴 | The preparation method of the mineral activated carbon containing rare earth |
| CN106241796A (en) * | 2016-07-14 | 2016-12-21 | 旌德县龙强净化材料厂 | A kind of method utilizing Exocarpium cocois (Cocos nucifera L) to prepare activated carbon |
| CN106517188A (en) * | 2016-11-04 | 2017-03-22 | 江苏竹溪活性炭有限公司 | Preparing method for coal-based active carbon for controlling environmental protection and control |
| CN106701732A (en) * | 2016-12-15 | 2017-05-24 | 浙江师范大学 | Preparation method and application of micrococcus luteus immobilized beads |
| CN106938846A (en) * | 2017-01-18 | 2017-07-11 | 广东韩研活性炭制造有限公司 | A kind of activated carbon adsorbed for waste incineration dioxin in flue gas and preparation method thereof |
| CN107058281A (en) * | 2016-12-20 | 2017-08-18 | 广东韩研活性炭制造有限公司 | A kind of biological activated carbon and preparation method thereof for the COD of sewage that is used to degrading |
| CN107115868A (en) * | 2016-02-24 | 2017-09-01 | 无锡中强电碳有限公司 | A kind of low temperature SCR denitration catalyst based on activated carbon and preparation method thereof |
| CN107140635A (en) * | 2017-05-26 | 2017-09-08 | 天津大学 | Macropore biological activated carbon of adjustable pore space and its preparation method and application |
| CN107381568A (en) * | 2017-08-31 | 2017-11-24 | 贺守印 | A kind of activated carbon and preparation method thereof |
| CN107555431A (en) * | 2017-09-13 | 2018-01-09 | 浙江佶竹生物科技有限公司 | A kind of bamboo matter column-shaped active carbon and its preparation method and application |
| CN107988200A (en) * | 2017-12-18 | 2018-05-04 | 玉山县三清活性炭有限公司 | A kind of biological activated carbon and preparation method thereof |
| CN108726667A (en) * | 2018-06-05 | 2018-11-02 | 佛山皖阳生物科技有限公司 | A kind of preparation method of hydrogel Microorganism-embeddcarrier carrier |
| CN108816191A (en) * | 2018-06-29 | 2018-11-16 | 成都新柯力化工科技有限公司 | A kind of compound bulky grain cleanser of graphite for air purification and preparation method |
| CN208177235U (en) * | 2018-01-22 | 2018-12-04 | 普罗生物技术（上海）有限公司 | Integral bio deodorization device |
| CN110182805A (en) * | 2019-06-22 | 2019-08-30 | 合肥煜创碳业有限公司 | A kind of preparation method of active carbon |
| CN210215082U (en) * | 2019-05-17 | 2020-03-31 | 浙江瑞丰机械设备有限公司 | COD's degradation system in waste water |
-
2020
- 2020-08-18 CN CN202010830664.6A patent/CN111995063A/en active Pending
Patent Citations (37)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2143359A1 (en) * | 1971-04-02 | 1975-01-30 | Peabody Coal Co | METHOD OF MANUFACTURING ACTIVATED CHARCOAL USING A STOVE WITH WALKING GRATE |
| CA1000223A (en) * | 1972-06-15 | 1976-11-23 | Keith M. Bowling | Demineralisation of brown coal |
| GB1460499A (en) * | 1973-05-05 | 1977-01-06 | Bayer Ag | Production of strong active carbon mouldings |
| US4102812A (en) * | 1975-10-02 | 1978-07-25 | Laporte Industries, Limited | Production of carbon from coal granules prepared in a fluid energy mill |
| RU2051097C1 (en) * | 1992-11-25 | 1995-12-27 | Уральский Научно-Исследовательский Химический Институт Научно-Производственного Объединения "Кристалл" | Method of activation of carbonized materials |
| CN101417193A (en) * | 2008-11-07 | 2009-04-29 | 江苏正本净化节水科技实业有限公司 | Nano crystallite composite filter material and supplement of manufacture method thereof |
| CN101423211A (en) * | 2008-11-14 | 2009-05-06 | 兖矿集团有限公司 | Technique for producing active carbon by extraction of coal fines |
| CN101503191A (en) * | 2009-03-13 | 2009-08-12 | 北京化工大学 | Method for preparing honeycomb active carbon from coal and coal tar |
| CN102126722A (en) * | 2010-01-20 | 2011-07-20 | 神华新疆能源有限责任公司 | Process for preparing coal-based agglomerated activated carbon |
| CN102633401A (en) * | 2011-02-15 | 2012-08-15 | 上海集策膜技术工程有限公司 | Biological treatment process technology for MBR (Meane Biological Reactor) membrane of engineering bacteria fed by using activated carbon as carrier |
| CN102583373A (en) * | 2012-02-13 | 2012-07-18 | 西安三瑞实业有限公司 | Method for preparing active carbon by using coal |
| CN102614854A (en) * | 2012-03-31 | 2012-08-01 | 复旦大学 | Method for preparaing dephosphorized and ferrum-carried activated carbon adsorbent |
| CN102674343A (en) * | 2012-04-01 | 2012-09-19 | 淮北市大华活性炭有限公司 | Production method for activated carbon |
| CN104822632A (en) * | 2012-11-30 | 2015-08-05 | 通用电气公司 | Produced water treatment to remove organic compounds |
| CN104073276A (en) * | 2013-03-29 | 2014-10-01 | 宁波互联聚能环保技术有限公司 | Drying, carbonizing and activating integrated method and equipment for solid carbon-containing substances |
| CN103496699A (en) * | 2013-10-21 | 2014-01-08 | 哈尔滨工业大学 | Preparation method for modified activated carbon |
| CN103588202A (en) * | 2013-11-18 | 2014-02-19 | 曹南萍 | Manufacturing method for active carbon/tourmaline composite material and product manufactured according to manufacturing method |
| CN103896268A (en) * | 2014-04-08 | 2014-07-02 | 山东大学 | Method for preparing multistage-aperture activated carbon with high specific surface area |
| CN105314632A (en) * | 2014-07-18 | 2016-02-10 | 福建省荔元活性炭实业有限公司 | Processing technology for active carbon |
| CN104383968A (en) * | 2014-12-07 | 2015-03-04 | 富阳鸿祥技术服务有限公司 | Preparation method of titanium oxide-sepiolite-active carbon composite carrier |
| CN107115868A (en) * | 2016-02-24 | 2017-09-01 | 无锡中强电碳有限公司 | A kind of low temperature SCR denitration catalyst based on activated carbon and preparation method thereof |
| CN105923907A (en) * | 2016-05-31 | 2016-09-07 | 北京国电富通科技发展有限责任公司 | Coal chemical industrial wastewater treatment system and treatment process |
| CN106241796A (en) * | 2016-07-14 | 2016-12-21 | 旌德县龙强净化材料厂 | A kind of method utilizing Exocarpium cocois (Cocos nucifera L) to prepare activated carbon |
| CN106185926A (en) * | 2016-07-15 | 2016-12-07 | 宋玉琴 | The preparation method of the mineral activated carbon containing rare earth |
| CN106517188A (en) * | 2016-11-04 | 2017-03-22 | 江苏竹溪活性炭有限公司 | Preparing method for coal-based active carbon for controlling environmental protection and control |
| CN106701732A (en) * | 2016-12-15 | 2017-05-24 | 浙江师范大学 | Preparation method and application of micrococcus luteus immobilized beads |
| CN107058281A (en) * | 2016-12-20 | 2017-08-18 | 广东韩研活性炭制造有限公司 | A kind of biological activated carbon and preparation method thereof for the COD of sewage that is used to degrading |
| CN106938846A (en) * | 2017-01-18 | 2017-07-11 | 广东韩研活性炭制造有限公司 | A kind of activated carbon adsorbed for waste incineration dioxin in flue gas and preparation method thereof |
| CN107140635A (en) * | 2017-05-26 | 2017-09-08 | 天津大学 | Macropore biological activated carbon of adjustable pore space and its preparation method and application |
| CN107381568A (en) * | 2017-08-31 | 2017-11-24 | 贺守印 | A kind of activated carbon and preparation method thereof |
| CN107555431A (en) * | 2017-09-13 | 2018-01-09 | 浙江佶竹生物科技有限公司 | A kind of bamboo matter column-shaped active carbon and its preparation method and application |
| CN107988200A (en) * | 2017-12-18 | 2018-05-04 | 玉山县三清活性炭有限公司 | A kind of biological activated carbon and preparation method thereof |
| CN208177235U (en) * | 2018-01-22 | 2018-12-04 | 普罗生物技术（上海）有限公司 | Integral bio deodorization device |
| CN108726667A (en) * | 2018-06-05 | 2018-11-02 | 佛山皖阳生物科技有限公司 | A kind of preparation method of hydrogel Microorganism-embeddcarrier carrier |
| CN108816191A (en) * | 2018-06-29 | 2018-11-16 | 成都新柯力化工科技有限公司 | A kind of compound bulky grain cleanser of graphite for air purification and preparation method |
| CN210215082U (en) * | 2019-05-17 | 2020-03-31 | 浙江瑞丰机械设备有限公司 | COD's degradation system in waste water |
| CN110182805A (en) * | 2019-06-22 | 2019-08-30 | 合肥煜创碳业有限公司 | A kind of preparation method of active carbon |
Non-Patent Citations (2)
| Title |
|---|
| 袁翠翠: "《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》", 28 February 2017 * |
| 钱汉卿等: "《化工水污染防治技术》", 31 July 2004 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115520973A (en) * | 2021-06-25 | 2022-12-27 | 神美科技有限公司 | Preparation method of biological activated carbon loaded with microbial inoculum |
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