Activated carbon adsorption has been widely used in the treatment of feed water and wastewater. A great deal of experience has shown that it is technically and economically suitable to treat many different industrial wastewaters with activated carbon.
Activated carbon treatment wastewater has the following characteristics: it can remove many organic pollutants and some heavy metals; the effluent water quality is excellent, the facilities are compact, the land occupation is small; it is easy to build and operate; it is economical. Therefore, activated carbon has been widely used in dye wastewater, gunpowder chemical wastewater, phenol wastewater, organic pesticide wastewater, development wastewater, refinery wastewater, printing and dyeing wastewater, synthetic washing wastewater, municipal wastewater, heavy metal wastewater, mercury-containing wastewater, chromium-containing wastewater, including Cyanide wastewater, carbon disulfide wastewater, treatment of atomic energy industrial wastewater. In addition, activated carbon can be used in combination with other treatment methods in some cases, in addition to being used as a separate method. For example, granular charcoal is used to treat effluent from biological treatment plants, sometimes for influent from biological treatment plants. In the former case, adsorption is used to remove chemicals remaining after biological treatment, such as nitrated aromatics in some plants. In the latter case, the purpose of adsorption is to remove substances such as chlorophenols from pesticide plants that are toxic or inhibiting biological processes.
When granular activated carbon is used for wastewater treatment, the activated carbon is usually charged into a packed column, and the raw water is treated through a packed column. The treatment is as follows.
1, fixed bed
There are two or several fixed bed type general packed towers, one of which is used as a replacement for activated carbon. The activated carbon in the packed column has a particle size of 8 to 40, a column height of 1 to 5 m, and a flow rate of 10 to 40 m/min. The raw water supply method is supplied from the downflow type supplied above the packed column and the upward flow type which flows upward from the lower side of the tower. Upflow can be divided into mobile layer and flow layer.
2, moving bed
The moving bed type is a method in which raw water is flowed upward from the input to perform adsorption treatment. The saturated activated carbon is intermittently discharged from the bottom of the column in small amounts, and each time an equal amount of new activated carbon is replenished from the top of the column. Usually 5% of the waste activated carbon is discharged from the tower clock 1 or 2 times a day. There is also an activated carbon which is saturated with adsorption continuously discharged from the adsorption tower. The continuous discharge of saturated activated carbon is carried out by moving the activated carbon in a layered manner along the flow direction of the raw water or in the opposite direction, and adsorbing while moving, the discharge of the saturated activated carbon and the supplement of the new activated carbon are continuously performed. The mobile unit is coupled to a regeneration device that effectively regenerates the saturated activated carbon. Regeneration costs are cheaper than fixed bed types.
3, fluid bed type
This is a method of adsorbing in a flowing state, so that even if the adsorption speed is slow, it can be treated with a small amount of activated carbon, which is expected to reduce capital construction costs and operating costs. In addition, the adsorption layer and the clogging phenomenon caused by the suspension of the suspended matter flowing into the raw water and the growth of microorganisms and algae do not occur, and even in a large apparatus, the flooding is unlikely to occur at night, so that the operation can be stably performed for a long period of time.
Experts who know the details of activated carbon bottom, buy 10 kg of activated carbon spent two or three hundred dollars, and in the market, small-package "home" activated carbon sold to dozens or even hundreds of dollars. People can't help but ask questions. Where can I buy practical, effective and cheap activated carbon? A room contaminated with harmful gases such as formaldehyde, how much can the amount of activated carbon be used to purify the air? Let the activated carbon spread the pollution source such as cabinets to solve the pollution. Question? Relevant experts have explained.
Comment: Activated carbon price 佫: The performance of activated carbon activated carbon determines the price of activated carbon. The good activated carbon 1kg should be hundreds of pieces. For example, we produce capacitor carbon and carrier carbon, 1KG is a few hundred pieces, and activated carbon is the best air purification activated carbon. CTC adsorption should reach 100%, benzene adsorption should reach 50%, and there are two kinds of carbon: spherical gas phase special activated carbon + imported special coconut shell activated carbon, micropores and mesopores combined to absorb harmful gases (formaldehyde, benzene) Etc.) So the price is 600 g / box, 48 yuan, compared to ordinary activated carbon, clean water charcoal, bamboo charcoal, etc. as air purification, it is not expensive.
★Use tips for activated carbon
1. The adsorption capacity of activated carbon has a lot to do with its shape. The smaller the particles, the larger the surface area and the better the adsorption effect. On the contrary, the activated carbon adsorption effect of Chengyu is the worst. Therefore, if bulk activated carbon is used, it is best to spread it into a face.
2. The activated carbon placed in the purifier has been used for a long time, and it can be used after being exposed to the sun.
3. In addition to bookcases and drawers, it is more convenient to place the activated carbon in a small bamboo basket, in a heating hood or in a flower cabinet.
4. Households using high-grade flooring are suitable for activated carbon, which can extend the service life of the floor.
Comment: Activated carbon product is one of the most effective air purification methods in the world. It was used as a gas mask during World War I. It is an internationally recognized drug addict. After last year's "SARS", I believe many people still remember the activated carbon mask. . If the granular activated carbon of 0.42~0.85mm size is the main component carrier, the two standards GB50325 and GB/T18883 for indoor air quality have clearly specified 20~40 mesh activated carbon for adsorbing indoor harmful gases.
Coconut shell activated carbon identification method:
Here are a few ways to easily distinguish between them
1. Coconut shell activated carbon belongs to the category of shell-shell activated carbon. Its main features are low density and light hand feeling. The weight in the hand is obviously lighter than that of coal-based activated carbon. The same weight of activated carbon, coconut shell activated carbon volume is generally larger than coal-based activated carbon.
2, coconut shell activated carbon shape is generally broken granular, flake, and molded activated carbon, such as columnar, spherical activated carbon, mostly coal charcoal.
3. Due to the low density of coconut shell activated carbon and light hand feeling, the activated carbon can be put into the water. The coal charcoal generally sinks faster, while the coconut shell activated carbon floats in the water for a longer period of time. If you add more weight, you will gradually sink into the bottom of the water. When the activated carbon is completely bottomed, you will see that each activated carbon is wrapped with a small bubble on the outside, which is crystal clear and very interesting.
4, coconut shell activated carbon is a small molecular pore structure, the activated carbon is placed in the water, the air discharged when the water molecules are adsorbed will produce many very small blisters (the naked eye can just see), densely floating to the surface. The coal-based activated carbon is generally a macromolecular pore structure, and the bubble phase produced is also large.
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