The application of activated carbon in sewage treatment is mainly used for three-stage advanced treatment. The strong adsorption capacity of activated carbon can effectively remove suspended particles, heavy metals, and some toxic and harmful substances in the sewage to achieve the purpose of deep purification. Activated carbon treatment of chromium-containing wastewater Chromium is a large amount of metal raw material used in electroplating. The price of wastewater in wastewater exists in different forms depending on the pH value.
Activated carbon has a very developed microporous structure and a high specific surface area. It has strong physical adsorption capacity and can effectively adsorb Cr(Ⅵ) in wastewater. There are a large number of oxygen-containing groups such as hydroxyl (-OH) on the surface of activated carbon. ), carboxyl group (-COOH), etc., they all have electrostatic adsorption function, and chemical adsorption effect on Cr(Ⅵ). It can be used to treat Cr(Ⅵ) in electroplating wastewater, and the adsorbed wastewater can meet the national discharge standard. The experiment shows that when the mass concentration of Cr(Ⅵ) in the solution is 50mg/L, pH=3, and the adsorption time is 1.5h, the adsorption performance of activated carbon and the removal rate of Cr(Ⅵ) reach the best effect. Therefore, the process of using activated carbon to treat chromium-containing wastewater is the result of the comprehensive effects of activated carbon on Cr(VI) in solution, such as physical adsorption, chemical adsorption, and chemical reduction.
Activated carbon treats chromium-containing wastewater with stable adsorption performance, high treatment efficiency, low operating cost, and certain social and economic benefits. Activated carbon for mercury-containing wastewater treatment Activated carbon has the ability to adsorb mercury and mercury-containing compounds, but its adsorption capacity is limited, so 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 first. After treatment, the mercury content is about 1mg/L, and when it is high, it can reach 2-3mg/L, and then use activated carbon for further treatment. Activated carbon treatment of phenol-containing wastewater is widely sourced from petrochemical plants, resin plants, coking plants and oil refineries. Experiments have proved that activated carbon has good adsorption performance for phenol, and the increase in temperature is not conducive to adsorption, which reduces the adsorption capacity; but the time for increasing the temperature to reach adsorption equilibrium is shortened. There is an optimal value for the amount of activated carbon and adsorption time. Under acidic and neutral conditions, the removal rate does not change much; under strong alkaline conditions, the removal rate of phenol drops sharply. The stronger the alkalinity, the worse the adsorption effect.
Activated carbon can be used to treat methanol-containing wastewater. Activated carbon can adsorb methanol, but its adsorption capacity is not strong. It is only suitable for treating wastewater with low methanol content. The project operation results show that the COD of the mixed liquid can be reduced from 40mg/L to less than 12mg/L, and the removal rate of methanol can reach 93.16% to 100%. The effluent water quality can meet the water quality of the influent water of the boiler desalination system. Claim. The oil refinery's advanced treatment of the oily wastewater from the oil refinery, after oil separation, air flotation and biological treatment, is then advanced by sand filtration and activated carbon filtration. The phenol content of wastewater decreased from 0.1mg/L (after biological treatment) to 0.005mg/L, cyanogen 0.19mg/L to 0.048mg/L, and COD from 85mg/L to 18mg/L. With the continuous deterioration of the domestic water environment and continuous in-depth research on water environment treatment technologies, activated carbon has an important role and broad application prospects in the field of sewage treatment.