Which waste contains significant amounts of fats, oils, and greases?

Domestic wastewater contains significant amounts of fats, oils, and greases primarily because it originates from residential sources such as kitchens and bathrooms. When cooking, household cleaning, and personal hygiene activities take place, various fat and oil by-products are introduced into the wastewater flow. For example, cooking oils, grease from food preparation, and bodily oils from bathing all contribute to the overall composition of domestic wastewater.

In contrast, industrial waste can also contain fats, oils, and greases, but it varies widely depending on the specific industrial processes. Stormwater mainly consists of rainwater runoff and typically includes debris, sediment, and pollutants accumulated on surfaces, rather than substantial amounts of fats and oils. Runoff, similar to stormwater, refers to surface water that flows over land, often collecting contaminants but generally lacking the concentrated fats and greases found in domestic sources. Thus, domestic wastewater is the most consistent source of fats, oils, and greases among the options listed.