What type of tank receives fluid from the soil and waste drain line?

A holding tank is a type of tank specifically designed to receive and temporarily store fluids, such as wastewater or liquid from soil and waste drain lines. Its primary function is to collect these fluids until they can be properly treated, transferred, or disposed of. This is essential in many systems, particularly in sewage and wastewater management, where holding tanks ensure that fluids are contained until they can safely be processed.

While storage tanks may hold liquids for longer periods, their primary purpose is not specifically to collect fluid from drainage systems. Separation tanks are generally used to separate different components of a mixture, rather than act as a receptacle for incoming fluids from drains. Transfer tanks are focused on moving liquids from one location to another rather than holding them for an extended time. Therefore, the correct identification of the holding tank's role aligns with the function described in the question.