A：Edible oil decolorization units play a critical role in edible oil refining processes by significantly improving oil purity and extending shelf life through targeted removal of impurities and enhancement of oxidative stability.

A：Activated clay is crucial in edible oil decolorization process because it has superior adsorption capacity for pigment removal, can remove oxidation products and impurities and enhance edible oil safety and compliance, etc.

A：The step-by-step maintenance plan for prolonging edible oil refinery system lifespan includes regular inspection and monitoring, system cleaning and filtration equipment maintenance, lubrication of the moving parts of the oil refinery system, etc.

A：Edible oil refining is a process of deep processing crude oil by using edible oil refining equipment through steps such as degumming, deacidification, decolorization, and deodorization. It can remove impurities in crude oil.