In raw sewage, the solid content is closest to:

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Multiple Choice

In raw sewage, the solid content is closest to:

Explanation:
Raw sewage is mostly water; the solid material makes up only a tiny fraction of the total mass. In typical influent, solids are about one-tenth of a percent by weight, which translates to roughly one gram of solids per liter of wastewater. That’s why the closest value is 0.1% solids. The other options imply far more solids than raw wastewater normally contains—5%, 20%, or 50% would be thick sludges, not ordinary influent.

Raw sewage is mostly water; the solid material makes up only a tiny fraction of the total mass. In typical influent, solids are about one-tenth of a percent by weight, which translates to roughly one gram of solids per liter of wastewater. That’s why the closest value is 0.1% solids. The other options imply far more solids than raw wastewater normally contains—5%, 20%, or 50% would be thick sludges, not ordinary influent.

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