Sand is an example of organic matter found in raw sewage?

• A. True
• B. False
• C. It depends on the source
• D. Not applicable

Answer: (B)

In wastewater, organic matter means carbon-containing substances from living or once-living organisms, like proteins, fats, carbohydrates, or microbial cells. Sand, on the other hand, is mineral grit—an inorganic solid. Because it isn’t carbon-based and doesn’t behave as biodegradable organic material, it isn’t considered organic matter. It may add to total suspended solids and grit in the wastewater, but it doesn’t contribute to the biodegradable or chemical oxygen demand measured for organic matter. So the statement is false.