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Activated carbon treatment of chromium-containing wastewater.
Chromium is a kind of metal material with large amount in electroplating, and hexavalent chromium exists in different forms with different pH value in wastewater. Activated carbon has a very developed micropore structure and a high specific surface area, and has a very strong physical adsorption ability, which can effectively adsorb Cr(VI) in wastewater. The surface of activated carbon has large oxygen-containing groups such as hydroxyl (-0H), carboxyl (- CO0H) and so on. They all have electrostatic adsorption function, which produces chemical adsorption on Cr (vi), which can be completely used to treat Cr (i) in electroplating wastewater. the adsorbed wastewater can meet the national discharge standard. hence, the process of using activated carbon to treat chromium-containing wastewater is the result of the comprehensive action of activated carbon on physical adsorption, chemical adsorption, chemical reduction and so on of Cr (vi) in solution. Activated carbon treatment of chromium-containing wastewater, stable adsorption performance, high treatment efficiency, low operating costs, has a certain social and economic benefits.carbon powder for sale
Activated carbon treatment of cyanide-containing wastewater.
In industrial production, cyanide or by-product cyanide is used in the wet extraction of gold and silver, the production of chemical fiber, coking, ammonia synthesis, electroplating, gas production and so on. Activated carbon has been used to purify wastewater for a long time, and the process of treating cyanide wastewater is more and more.
Activated carbon treatment of mercury-containing wastewater.
Activated carbon has the ability to adsorb mercury and mercury-containing compounds, but the adsorption capacity is limited, so it is only suitable for treating wastewater with low mercury content. When the concentration of mercury is high, it can be treated by chemical precipitation method, after treatment, the mercury content can reach 2-3 when it is about 1 mgL, high mg/L, and then further treatment with activated carbon.
Activated carbon treatment of phenol-containing wastewater.
Phenolic wastewater is widely derived from petrochemical plants, resin plants, coking plants and refining plants. It is proved by experiments that the adsorption performance of activated carbon to phenol is good, and the increase of temperature is not conducive to adsorption, so that the adsorption capacity is reduced, but the time of increasing temperature to reach adsorption equilibrium is shortened. The amount of activated carbon and the adsorption time have the best value. Under acidic and neutral conditions, the removal rate does not change much; under strong alkaline conditions, the removal rate of phenol drops sharply, and the stronger the alkalinity, the worse the adsorption effect.
Activated carbon treatment of methanol-containing wastewater.
Activated carbon can adsorb methanol, but the adsorption capacity is not strong, only suitable for the treatment of wastewater containing low methanol. The results of engineering operation show that the COD of the mixture can be reduced from 40 mg/L to less than 12 mg/L, and the removal rate of methanol reaches 93.16%-100%, and the effluent quality can meet the water quality requirement of reuse to the influent of boiler desalted water system.coconut shell active carbon manufacturer