1 High temperature regeneration method changes the adsorption equilibrium to achieve the purpose of desorption and decomposition. The most widely used way is to add water vapor, inert gas, combustion gas and C02 and heat it to 700 / 1000 ℃.
(1) For dehydration and drying, first separate the activated carbon from the conveying liquid phase, and then heat the activated carbon to 100 ~ 150 ℃ to remove the water in the pores of the activated carbon (the moisture content is nearly 40% ~ 50%, and part of the organic matter with low boiling point is also volatilized, and the other part is carbonized and left in the pores of activated carbon. The heat required for drying is about 50% of the total energy consumption of regeneration, and the volume used accounts for 30% ~ 40% of the total regeneration unit.
(2)Carbonization is heated to 300 ~ 700 ~ to volatilize all the organic matter with low boiling point, and the organic matter with high boiling point will undergo thermal decomposition, one part will become volatile desorption of organic matter with low boiling point, and the other part will remain in the pores of activated carbon after carbonization. The heating rate and carbonization temperature depend on the type of adsorbent. 3) continue to heat the activated carbon to 700 ~ 1000 ~ and introduce activated gas (such as water vapor, carbon dioxide and oxygen) into the pores of activated carbon to decompose the carbon and chemicals remaining in the pores into activated gases such as carbon oxide, carbon dioxide and hydrogen to escape, so as to achieve the purpose of pore regeneration. 4. Cool the activated carbon and cool the activated carbon sharply with water, Prevent oxidation
(3)The activated carbon continues to be heated to 700 ~ 1000 ~ and the activated gas (such as water vapor, carbon dioxide and oxygen) is introduced into the activated carbon pores to decompose the carbon and chemicals remaining in the pores into activated gases such as carbon oxide, carbon dioxide and hydrogen to escape, so as to achieve the purpose of pore reconstruction (4) cooling: rapidly cool the activated carbon with water to prevent oxidation.
2. Chemical oxidation regeneration method: oxygen, air, OS, chlorine water, bromine water, potassium permanganate and other oxidants, electrolytic oxidation (at the anode), acid-base immersion, etc
Usage mainly refers to wet oxidation method, which is mainly used for regeneration of powdered activated carbon. The process flow is as follows: the saturated powdered activated carbon is sent to the heat exchanger by high pressure pump, and then sent to the regeneration reactor by steam heater. At 220 ℃ and 5.3mp. Under the conditions of high temperature and high pressure, the organic matter adsorbed by the activated carbon reacts with the oxygen in the air sent into the tower to regenerate the activated carbon. The regenerated carbon is cooled by the heat exchanger and sent to the regeneration storage tank for use. The wet oxidation method has the advantages of wide application range (including adaptability to pollution types and concentrations), high treatment efficiency, low secondary pollution, fast oxidation rate, small device, recoverable energy and useful substances.
3. Reagent regeneration method
Also known as extraction. Clean with benzene, acetone, methanol, isopropanol, ± alkane and other organic solvents. A regeneration method for desorbing adsorbate by using the chemical reaction between chemical agent and adsorbate. Reagent regeneration is divided into two methods: inorganic reagent regeneration and organic solvent regeneration. Inorganic agent regeneration uses h2s04, hc| or NaOH as regeneration agents to convert pollutants adsorbed on activated carbon into water-soluble substances for desorption. The organic solvent regeneration method uses organic solvents such as benzene, acetone or methanol to desorb the organic matter adsorbed on activated carbon under the extraction of solvents.
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