Activated carbon products mainly include coconut shell activated carbon, shell activated carbon, coal-based activated carbon, etc. No matter what kind of activated carbon you use, it is a hydrophobic adsorbent prepared by carbonization and activation. After a series of processing, it becomes a finished activated carbon. The husk activated carbon contains a large number of micropores, has a large specific surface area, can effectively remove chromaticity and odor, and can remove most organic pollutants and some of the secondary effluent. Inorganic, containing certain toxic heavy metals. Next, the experts tell you a few common sense to buy shell activated carbon.
1. The two kinds of activated carbon have the same weight. The larger the volume, the stronger the adsorption capacity.
In order to improve the adsorption performance of the activated carbon of the shell, only the pore structure is built on the activated carbon as much as possible. The more pores, the looser the activated carbon, the lighter the relative density, so the good activated carbon will be lighter. In the case of the same weight package, the performance of the activated carbon will be much larger than the inferior activated carbon. Haixin advanced air adsorption special shell carbon, ordinary coconut shell activated carbon volume is more than 1/3, pore diameter developed material loose, the same weight of shell activated carbon can absorb more harmful gases.
2, whether it is coconut shell carbon or shell carbon, high iodine value is good carbon.
Activated carbon purification gas relies on adsorption capacity. There is an important index of adsorption capacity - iodine value. The higher the iodine value, the stronger the adsorption capacity. The hotter heat is now coconut shell carbon, but some unactivated or technically unrecognized coconut shell iodine values ​​may not reach 500. In addition to some well-known brands that are certified to go2map, we should ask the seller to produce an iodine value test report when purchasing most other activated carbon.
3. The charcoal permeability of the packaged shell activated carbon product is very important.
Put the charcoal bag on the mouth and blow it. If the gas can easily pass through the charcoal bag, the air permeability of the charcoal bag is good. If the charcoal bag feels unable to blow, the air is difficult to pass, and the better carbon installed on the surface is also difficult to play a big role. As a product of passive adsorption, the air must be able to penetrate freely into the deep layer of the carbon package, and the carbon package can play a good role in air purification and adsorption. In theory, tearing the charcoal package and putting the charcoal directly into the tray may be the best way to pass air. Of course, this method has a certain impact on environmental sanitation.
4. Bamboo charcoal we often hear is not activated carbon.
The focus of each product is different. Bamboo charcoal has a certain adsorption capacity for moisture and has the effect of adjusting the spatial humidity. However, bamboo charcoal micropores have low iodine value and cannot be used as a harmful gas purification product. Its pore size has a weak ability to capture harmful gases and cannot firmly capture the captured formaldehyde molecules.
5. Any activated carbon is not omnipotent.
If the drug is used as a metaphor for decorating pollution control products, then activated carbon is more like traditional Chinese medicine and formaldehyde scavenger is more like western medicine. One pays attention to conditioning but it has a slower effect, and it is immediate but not root. The combination of the two products is the best match with the Tianlong Ba Bu, just like the combination of Chinese and Western medicine that the medical profession has recently admired. In a short period of time, it is unrealistic to rely on activated carbon to quickly reach the standard and quickly remove the taste. In general, the use of activated carbon in the spring, summer and autumn is based on the pollution and ventilation conditions for 1-2 months of ventilation, especially in the winter in the north. It is not recommended to use activated carbon alone, and must cooperate with some formaldehyde scavenger products for pollution sources. In general construction, the treatment agency will first use formaldehyde scavenger to remove most of the pollution sources, and the residual pollution source will be slightly over-subscribed to the shell activated carbon.
Advantages of shell activated carbon:
The shell activated carbon has the advantages of developed pore structure, large specific surface area, strong adsorption capacity, high mechanical strength, small bed resistance, good chemical stability, easy regeneration and durability, and the shell activated carbon has various specifications of granularity.
The negative effects of activated carbon:
(1) Activated carbon adsorbs a large amount of organic matter. These organic substances will become the nutrients of microorganisms such as bacteria. The bacteria will multiply and proliferate in the micropores of activated carbon, and may cause the total number of colonies in the effluent to exceed the standard.
(2) The activated carbon in water treatment converts ammonia nitrogen into nitrite nitrogen under the action of microorganisms. It is often found that the nitrite in water treatment effluent is many times higher than the influent water. Nitrite itself is not a carcinogen, but its nitrosamines formed by reaction with amines in water are strong carcinogens.
Analyze the production process of pure water:
In the production process of reverse osmosis, the anion and cation in water can be removed by electrodialysis, reverse osmosis and ion exchange resin technology; the particles in water can be removed by ultrafiltration, membrane filtration, etc.; bacteria in water, currently domestic It is often removed by dosing or UV lamp irradiation or ozone sterilization.
The TOC in water is generally treated with activated carbon and reverse osmosis. In the field of high-purity water applications, the purity of water is directly related to the performance, reliability, and threshold voltage of the device, resulting in low breakdown, defects, and minority life of the material. Therefore, the high purity water requirement of the clean water boiler is quite high. Purity and precision. The gases dissolved in natural water are mainly O2, CO2, SO2 and a small amount of CH4, helium, chlorine, etc., in the production process of high-purity water, it is necessary to remove such gases. In order to effectively remove impurities, some chemical fungicides such as formaldehyde, hydrogen peroxide, sodium hypochlorite and the like are added in the process of producing high-purity water. These are all reasons why high purity water cannot be used as drinking water.
So what is reverse osmosis?
The so-called reverse osmosis means that its water quality is pure, does not contain any harmful substances and bacteria, such as organic pollutants, inorganic salts, any additives and various impurities, effectively avoiding the invasion of various bacteria into the human body, and its advantage is that it can be effectively and safely given The human body replenishes water and has a strong solubility. Therefore, it has a strong affinity with human cells and promotes metabolism. It is water produced by advanced treatment using ion exchange, reverse osmosis, fine filtration and other appropriate physical processing methods. Under normal circumstances, Zhenjiang reverse osmosis in the production process, only 50%-75% of the source water is used, that is to say, 1 kg of tap water or groundwater can only produce about 0.4 kg of reverse osmosis, and the remaining 0.6 kg or so The water cannot be used as drinking water and can only be used for other purposes.
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