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Activated carbon desorption is the reverse process of adsorption. It is the process by which the adsorbed components are separated from the saturated adsorbent, allowing the adsorbent to be regenerated. It refers to the process by which substances adsorbed at an interface, under certain conditions, leave the interface and re-enter the bulk phase, also known as desorption. The degree of desorption of the adsorbent has a significant impact on its ability to absorb substances again, and this degree of desorption is closely related to the method used for desorption. The main sources of pollution in fishery waters are industrial wastewater and domestic sewage. When there are no filtration systems in such waters, an increase in temperature leads to an increase in the ammonia nitrogen level due to fish excrement and residual fish feed. Over time, this accumulation results in excessive growth of aquatic plants, algae, and microorganisms, thereby deteriorating water quality. The water also acquires a fishy smell, unusual odors, and becomes darker, reducing its transparency and preventing sunlight from reaching the aquatic organisms as well as hindering their absorption of oxygen. The key to selecting activated carbon lies in conducting a comprehensive evaluation of the properties of various candidate carbon sources from different perspectives. The tests for analyzing the performance indicators of activated carbon are carried out from the perspective of actual production; key properties that affect the effectiveness and cost of granular activated carbon are identified, especially those that are important when it is used on a large scale. These tests are conducted for comparison, in order to guide analysis and control processes in the actual production of activated carbon. Functional characteristics of coconut shell activated carbon: It has a large adsorption capacity and a wide range of adsorption capabilities. It is primarily used for filling, dechlorination, oil removal and purification in manufacturing equipment for urban daily drinking water, tap water, purified water, distilled water, ultra-pure water, etc., as well as for the advanced treatment of various industrial wastewater. The product features a well-developed porous structure, a large specific surface area, strong adsorption capacity, low impurity content, and the ability to be regenerated and reused. In addition to carbon as its main component, it also contains small amounts of hydrogen, nitrogen, and oxygen. Its structure resembles a hexagon, and the specific surface area of each gram of activated carbon is as high as 1,000 square meters. Indoor pollution refers to the situation where the amount of air pollutants entering a room exceeds the self-purification capacity of the indoor environment, resulting in a decline and deterioration of air quality inside the room, which can have adverse effects on people either directly or indirectly. For example, formaldehyde; the primary sources of formaldehyde in indoor environments are building materials, furniture, various adhesives and paints, as well as synthetic fabrics. The primary source among them is wood-based panels. Formaldehyde is a volatile compound with a strongly irritating gas odor. Both toluene and xylene are colorless but have an aromatic odor, existing in the air as vapors. In interior decoration, improper selection of decorative materials or unreasonable construction techniques can easily lead to contamination by benzene and benzene derivatives in indoor areas.