Powdered physical activated carbon - Table 1 (using US or European standards)
Syrup coefficient: 2.5, 3.0;
Iodine value (mg/g, min): 600-1100 (optional);
Iron salt (%, max): 0.05;
Chloride (%, max): 0.05;
Ash (%, max): 3-12 (selection);
Moisture (%, max): 5-10 (selection);
PH: 8-11;
Mesh: -200,90%;
Packing (kg): 20/500;
Relevant indicators can be adjusted according to user needs;
Chemical powdered activated carbon (phosphoric acid method, zinc chloride method optional)
Model: GA, PGA, SC-GA, LA, LA2, TLA;
Syrup coefficient: 0.9-1.0 0.6-0.8 0.8-1.0 1.0;
Caramel discoloration (%, min): 95-100 (optional);
Methylene blue (ml/g, 0.12%): 200-270 (optional);
Iodine value (mg/g, min): 1000-1400 (optional);
Iron salt (%, max): 0.05-0.1 (optional);
Chloride (%, max): 0.05-0.2 (optional);
Ash (%, max): 2-7 (selection);
Moisture (%, max): 5-10 (selection);
PH: 3-5;
Mesh: -200,90%;
Packing (kg): 20\400;
Relevant indicators can be based on user needs;
product advantages:
1. Wood physics powdered activated carbon:
Strictly screen high-quality wood raw materials and revitalize them with water vapor. It has the remarkable characteristics of large adsorption capacity and rapid adsorption. It is mainly used for refining, decolorizing and deodorizing products in water treatment and food, medicine, chemical and other industries.
2. Chemical powdered charcoal:
Strictly screen high-quality wood raw materials and use chemical methods to revitalize them. It has the remarkable characteristics of large adsorption capacity and rapid adsorption. It is mainly used for refining, decolorizing and deodorizing products in food, medicine and chemical industries.
main feature:
Reference unit price: 6000-8000 yuan / ton;
Accreditation standard: GBJISASTM;
Treatment of Organic Chemical Wastewater by Powdered Activated Carbon Enhanced SBR Process:
The Sequencing Batch Reactor (SBR) is a variant of the traditional activated sludge process. Its reaction mechanism and the removal mechanism of pollutants are basically the same as those of the traditional activated sludge process. The process has the advantages of simple process flow, stable treatment effect, small floor space, strong impact load resistance and the ability of phosphorus removal and nitrogen removal. However, due to the intermittent cycle operation of the SBR process, the concentration of DO and organic matter in the reactor changes with time. The degradation mechanism, reaction kinetics and design and control of the microorganisms in the environment of such cyclical changes are more complex. The powder carbon-activated sludge process (PAC) is an easy, flexible and efficient method for the existing SBR process. The PAC method is to put powdered carbon into the existing activated sludge treatment system to improve the processing capacity. The enzyme secreted by the microorganism is enriched on the surface of the activated carbon, thereby effectively oxidizing and decomposing the organic matter, and some dissolved organic matter having a slow degradation rate is adsorbed by the activated carbon, prolonging the residence time in the system, and thus does not penetrate the system.
In actual engineering, the water quality and water volume of organic industrial wastewater vary widely, often containing toxic substances, and sludge expansion is likely to occur in the conventional SBR process. Li Yuhua, Ren Gang, based on the investigation of the adsorption characteristics of PAC (powdered activated carbon), the original SBR process was strengthened by the powder activated carbon-reinforced SBR process. The actual operation results showed that the CODcr removal rate reached 9012%-9815%. The removal rate of BOD5 is 9118%~9814%, and the removal rate of NH3-N is 8314%~9418%. The treatment effects are better than SBR process. By comparing the improvement effect of CODcr and BOD5 by PAC-SBR process, it can be explained that the mutual strengthening relationship between microorganisms and PAC is the improvement mechanism of PAC-SBR process on organic matter removal. In addition, the sludge performance is improved, which effectively avoids the occurrence of abnormal phenomena such as sludge expansion and foam. Therefore, it is an easy, flexible and efficient improvement method for the existing SBR process.
Types of wood powdered activated carbon:
Charcoal products are mainly divided into four categories: white carbon, black carbon, activated carbon, and mechanical carbon. The following is a brief introduction to the basic knowledge of four types of charcoal:
According to the raw materials of charcoal, the tree species can be divided into three categories: the first type is hard hardwood, such as Cyclobalanopsis, Betula, Mochi, Bitter, Amaranth, Maple, etc. The second type is soft broadleaf, such as Yang and Yan. The third type is softwood, such as masson pine, red pine, spruce, etc.
According to the material and not the material can be divided into: the first type of non-synthetic forest is mainly used for civil charcoal, that is, firewood; the second type of timber is mainly used for industrial and civil wood processing, both fuelwood.
Brief introduction of charcoal kiln: There are many forms and structures of kiln, such as Zhejiang kiln, squid kiln, wood kiln, Hunan wood kiln and Sichuan wood kiln, faster iron kiln, machine kiln and so on. Usually, the method of extinguishing the kiln is called the kiln flameout method, and the obtained char is called "black carbon". When the wood is charred in the kiln, the method of removing heat from the kiln and then extinguishing it with wet sand is called the kiln flameout method. During the flameout process, the charcoal is calcined by contact with air, and the outside of the carbon is oxidized, and the resulting white ash is attached to the charcoal, which is called "white charcoal". White carbon is harder than black carbon. However, the raw materials of white carbon and black carbon are also different.
The use of powdered activated carbon in water treatment has been around for 70 years. Since the first use of powdered activated carbon in the United States to remove the odor of chlorophenol, activated carbon has become one of the effective methods for removing color, smell, taste and organic matter in water treatment. A large number of studies on the adsorption performance of powdered activated carbon in foreign countries show that the powdered activated carbon contains trichlorophenol, dichlorophenol, organic matter contained in pesticides, trihalomethanes and precursors, and disinfection by-products such as trichloroacetic acid, dichloroacetic acid and dihalide. Acetonitrile and the like have good adsorption effects, and the removal effects on color, smell and taste have been recognized.
Powdered activated carbon is widely used in Europe, the United States, Japan and other countries. In the early 1980s, the powdered activated carbon used in water treatment in the United States was about 25,000 tons per year, and it has an increasing trend year by year. At the end of the 1960s, China began to pay attention to the problem of deodorization and deodorization of polluted water sources. Powdered activated carbon has been tried in Shanghai, Harbin, Hefei and Guangzhou. In recent years, China has gradually paid more attention to the research and application of powdered activated carbon. Tongji University and Harbin University of Architecture have made in-depth research and have achieved many practical results.
The main features of the application of powdered activated carbon are equipment investment, low price, fast adsorption speed, and strong adaptability to short-term and sudden water pollution.
Problems to be solved in engineering applications:
(1) The problem of dust pollution in the application. In the application of waterworks, powdered activated carbon is labor-intensive in many processes such as loading, unloading, unpacking, preparation, and dosing, which easily causes dust to fly, resulting in a bad working environment, strong resistance of operators, and also becomes a restriction on powdered activated carbon. A key, substantive issue of technology application.
According to the data report, some water plants use negative pressure preparation and dosing methods for powdered activated carbon. This method has basically solved the problem of dust pollution, but it is still difficult to avoid the problem of dust flying and labor intensity caused by powdered activated carbon (20kg/bag) during handling and unpacking, especially the processing capacity is more than 100,000 m3/d. In the waterworks, the amount of powdered activated carbon per hour is generally about 60 kg (calculated by the dosage of 15 mg/L).
(2) The problem of accurately preparing and quantifying the addition of powdered activated carbon in the application. In order to stabilize the effect of adsorption and decontamination of powdered activated carbon, it is necessary to ensure the accuracy of dosing and measurement within a certain range, which is not only related to the treatment effect, but also closely related to the cost of water production. The entire powdered activated carbon storage, formulation, dosing equipment or system constructed according to the appropriate parameters must be able to prevent the instability factors caused in various links, such as the blockage problem during the transportation and dosing process, which will cause the flow to be unstable. Thereby affecting the effect of decontamination.
(3) Automatic control of equipment or systems. In order to further reduce the operation intensity of the powder activated carbon dosing equipment, how to achieve automatic operation, match with the original automatic control system of the water plant and how to automatically track and adjust according to the change of water quality to meet the purpose of stabilizing the effluent water quality, which also restricts the application of the technology. The key factor.
(4) Investment and cost control. The most critical issue in the application of powdered activated carbon technology is investment and cost control, in order to meet the new "Sanitary Standards for Drinking Water" (mainly CODMn <3mg / L, in special cases not more than 5mg / L), most water division Both face the problem of technological transformation. For most water divisions, water pollution is generally intermittent or sudden, and conventional processes are able to meet new specifications most of the time, so powdered activated carbon technology is a very practical technology. The investment is relatively provincial, the cost is low, and the investment is flexible.
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