Ding Xinda activated carbon pigment

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Asked at 2022-01-17 23:33:33

1. Activated carbon treatment of wastewater containing chromium. Chromium is a kind of metal raw material used in electroplating. The hexavalent chromium in wastewater exists in different forms with different pH values. Activated carbon has a very developed microporous structure and high specific surface area, has a strong physical adsorption capacity, can effectively adsorb Cr (V) in wastewater. There are a large number of oxygen-containing groups on the surface of activated carbon, such as hydroxyl (-OH), carboxyl (-COOH), etc., which all have the function of electrostatic adsorption and produce chemical adsorption on Cr (VI). It can be completely used to treat Cr (VI) in electroplating wastewater, and the adsorbed wastewater can meet the national discharge standard. The results showed that when the mass concentration of Cr (VI) in the solution was 50mg/L, pH=3 and adsorption time was 1.5h, the adsorption performance and Cr (VI) removal rate of activated carbon reached the best effect. Therefore, the process of treating wastewater containing chromium by activated carbon is the result of the comprehensive action of physical adsorption, chemical adsorption and chemical reduction of Cr (VI) in solution by activated carbon. Activated carbon treatment of wastewater containing chromium has stable adsorption performance, high treatment efficiency, low operating cost, and certain social and economic benefits.

2. Treatment of cyanide-containing wastewater with sexual carbon. In industrial production, cyanide or by-product cyanide is used in the wet extraction of gold and silver, the production of chemical fiber, coking, synthesis of ammonia, electroplating, gas I production and other industries, so a certain amount of cyanide-containing wastewater must be discharged in the production process. Activated carbon has been used to purify wastewater for a long time and there are more and more reports on its application in the treatment of cyanide-containing wastewater. However, due to the small adsorption capacity of CN_ and HCN on activated carbon, which is generally 3mgCN/ GAC --8mgCN/ GAC depending on the variety, it is not cost-effective in the treatment cost.

3. Activated carbon treatment of wastewater containing mercury. Activated carbon has the ability to adsorb mercury and mercury-containing compounds, but its adsorption capacity is limited, and it is only suitable for treating wastewater with low mercury content. If the concentration of mercury is high, it can be treated by chemical precipitation method first. After treatment, the mercury content is about 1mg/L, and it can reach 2-3mg /L when high, and then further treatment with activated carbon.

4. Activated carbon treatment of phenol-containing wastewater. Phenol-containing wastewater is widely sourced from petrochemical plants, resin plants, coking plants and oil refining and chemical plants. The experimental results show that the activated carbon has a good adsorption performance for phenol, but the increase of temperature is not conducive to adsorption, so that the adsorption capacity is reduced. But the time to reach adsorption equilibrium is shortened by increasing the temperature. The optimum values of the amount of activated carbon and the adsorption time were found, and the removal rate changed little under acidic and neutral conditions. Under the condition of strong alkalinity, the removal rate of phenol decreased sharply, the stronger the alkalinity, the worse the adsorption effect. 

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