Texas Wastewater Class B Practice Exam

Inorganic Solids are primarily composed of which materials?

1. Organic compounds and water

2. Sand, grit, and minerals

3. Biomass from microorganisms

4. Microfibers and plastics

The correct answer is: Sand, grit, and minerals

The correct choice accurately identifies that inorganic solids are primarily made up of materials like sand, grit, and minerals. Inorganic solids are non-carbon based and typically originate from natural processes, contributing to the solid component of wastewater. Sand and grit are common in wastewater due to their natural occurrence in the environment, while minerals encompass a wide range of chemical compounds that may be found in soil or rock. Organic compounds and water are more associated with organic matter and do not define inorganic solids. Similarly, biomass from microorganisms refers to the living or decomposed organic matter, distinguishing it from inorganic materials. Microfibers and plastics are synthetic compounds typically regarded as pollutants but do not accurately represent the classification of inorganic solids. Overall, the focus on sand, grit, and minerals directly links to the true nature of inorganic solids found in wastewater systems.