Shell activated carbon is widely used in deep purification of drinking water, industrial water and wastewater, industrial water purification and gas phase adsorption, such as power plants, petrochemicals, oil refineries, food and beverage, sugar making, medicine, electronics, fish farming, shipping The water purification treatment of the industry can effectively adsorb free chlorine, phenol, sulfur and other organic pollutants in the water, especially the precursor substances of the mutant (THM), to purify and remove impurities and odor. It can also be used for industrial exhaust gas purification, gas desulfurization, petroleum catalytic reforming, gas separation, pressure swing adsorption, air drying, food preservation, gas mask, solvent removal, activated carbon body, industrial solvent filtration, decolorization, and wheat stone filtration. Pure and so on.
Preparation of granular activated carbon by hard shell chemical continuous activation method. Technical background Activated carbon is a modern chemical industry, petroleum industry, and active calcium carbonate is in short supply in the domestic market. The main reason is that the products are widely used, the amount is large, and the production, various gases Separation, purification, purification; organic solvent recovery; decolorization, deodorization, refining of sugar, monosodium glutamate, medicine, alcohol, beverage; precious metal refining; catalyst and catalyst carrier in the chemical industry.
The product has more functions of decolorization, purification, impurity removal, deodorization, odor removal, carrier, purification and recovery. Packing and storage: 50kg bag, plastic woven bag, the product should be stored in a dry place indoors.
Because activated carbon has high requirements for water pretreatment, and activated carbon is expensive, in waste water treatment, activated carbon is mainly used to remove trace contaminants in wastewater to achieve deep purification.
1. Activate activated carbon charcoal to treat chromium-containing waste activated carbon water.
The main advantages of activated carbon in wastewater treatment are high degree of treatment and stable effluent quality. Combined with other methods, this chapter introduces the development history and research status of activated carbon, basic structure and properties, application fields, and different varieties. In a large amount of metal raw materials, the hexavalent chromium in the wastewater exists in different forms depending on the pH value. Activated carbon has a well-developed microporous structure and high specific surface area, and has strong physical adsorption capacity, which can effectively adsorb Cr(VI) in wastewater. The surface of activated carbon has a large number of oxygen-containing groups such as hydroxyl groups (-OH). ), carboxyl groups (-COOH), etc., all of which have electrostatic adsorption functions and produce chemisorption of Cr(VI). It can be used to treat Cr(VI) in electroplating wastewater, and the adsorbed wastewater can meet national emission standards.
The test shows that the adsorption concentration of Cr(VI) and the removal rate of Cr(VI) are the best when the concentration of Cr(VI) in the solution is 50mg/L, pH=3, and the adsorption time is 1.5h. Therefore, the process of treating chromium-containing wastewater by using activated carbon is the result of the combined action of activated carbon on physical adsorption, chemical adsorption and chemical reduction of Cr(VI) in solution. The activated carbon treatment of chromium-containing wastewater has stable adsorption performance, high treatment efficiency, low operating cost, and certain social and economic benefits.
2. Charcoal treatment of cyanide-containing wastewater. In industrial production, gold and silver wet extraction, chemical fiber production, coking, ammonia synthesis, electroplating, gas production and other industries use cyanide or by-product cyanide, so in the production process must emit a certain amount of cyanide Waste water. Activated carbon has been used for purifying wastewater for a long time. There are more and more reports on the treatment of cyanide-containing wastewater. However, due to the small adsorption capacity of CN_ and HCN on activated carbon, it is generally 3mgCN/gAC～8mgCN/gAC. Variety varies and is not cost effective in terms of processing costs.
3. Activated carbon treatment of mercury-containing wastewater. Activated carbon has the property of adsorbing mercury and mercury-containing compounds, but has limited adsorption capacity and is only suitable for treating wastewater with low mercury content. If the concentration of mercury is high, it can be treated by chemical precipitation first. After treatment, it contains about 1 mg/L of mercury, and when it is high, it can reach 2-3 mg/L, and then it is further treated with activated carbon.
4. Activated carbon treatment of phenol-containing wastewater. Phenol-containing wastewater is widely used in petrochemical plants, resin plants, coking plants and refinery plants. It has been proved by experiments that the adsorption performance of activated carbon on phenol is good, the temperature increase is not conducive to adsorption, and the adsorption capacity is reduced; but the time to increase the adsorption equilibrium is shortened. The optimum amount of activated carbon and adsorption time existed. Under acidic and neutral conditions, the removal rate did not change much. Under strong alkaline conditions, the removal rate of phenol decreased sharply. The stronger the basicity, the worse the adsorption effect.
5. Activated carbon treatment of wastewater containing methanol. Activated carbon can adsorb methanol, but its adsorption capacity is not strong, and it is only suitable for treating wastewater with low methanol content. The columnar activated carbon process results show that the COD of the mixture can be reduced from 40mg/L to less than 12mg/L, and the removal rate of methanol can reach 93.16%～100%. The effluent quality can be reused to the boiler desalinated quartz sand. The water quality requirements of the filter feed water.
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 the water purifier converts the ammonia nitrogen in the water into nitrite nitrogen under the action of microorganisms. It is often found that the nitrite in the water purifier 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.
(3) Filtration or UV sterilization of effluent plus bromine resin (brominated polystyrene hydantoin) adsorbed by activated carbon is a good method to solve the problem of microbial exceeding in water.
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