Ace the Texas Wastewater Class B Test 2026 – Dive In and Flow to Success!

The correct answer includes sand, grit, and minerals because these materials are characterized as inorganic solids commonly found in wastewater. Inorganic solids are generally defined as materials that do not contain carbon and are not derived from living organisms. Sand and grit arise from soil and dust, which can enter the wastewater system during rainfall or runoff, while mineral solids can come from various sources, including natural minerals that are carried into the system.

The other options involve organic materials or are not considered inorganic in the context of wastewater. For example, paper and plastics are primarily organic compounds despite their physical nature as solids, and food waste is composed of organic materials, which means they are not classified as inorganic solids. Oil and grease, likewise, originate from organic substances like fats and oils, making them unsuitable as examples of inorganic solids in wastewater treatment.