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Increased health awareness and industrial development have made water treatment an important area related to people’s health and the harmonious development of society. Water treatment is divided into surface water treatment and wastewater treatment. Water used in applications such as domestic use, industrial use, and pure water generally refers to water that has been artificially treated before being put into use. Since the policy for water treatment relates to drinking water, the requirements for the adsorption capacity of coconut shell activated carbon used in tap water treatment are relatively low, whereas higher demands are placed on the safety properties of the activated carbon itself. Furthermore, activated carbon for reclaimed water reuse can be used in combination with different materials to develop new process technologies aimed at achieving better treatment results. In the primary physical-chemical treatment stage of wastewater, activated carbon is primarily used as a flocculation and adsorption agent to adsorb or assist in the flocculation of certain organic pollutants that are difficult to biodegrade or toxic to microorganisms. Citric acid is an important organic acid, also known as citrate. It is a colorless crystal that often contains one molecule of crystalline water; it is odorless but has a strong acidic taste, and it is readily soluble in water. Its calcium salt dissolves more easily in cold water than in hot water, and this property is often used to identify and separate citric acid. Appropriate temperature control during crystallization can yield anhydrous citric acid. Activated carbon specialized for citric acid has numerous applications in industries such as industry, the food industry, and the cosmetics industry. In practice, when using activated carbon for solvent recovery, attention should be paid to the balance between its adsorption capacity and desorption capacity. It is ideal to design and adjust the pore size distribution of the activated carbon based on the size of the solvent molecules, in order to maximize the difference between its effective working capacity and adsorption capacity on one hand, and the amount that can be desorbed on the other hand ； When the activated carbon used for solvent recovery is employed solely for solvent concentration, with the solvent being subsequently rendered harmless (usually through incineration or catalytic combustion), although its desorption capacity should also be considered, the requirements are **lower than those in the recovery process.