Grit cannot be broken down in biological treatment processes because it is primarily:

Grit cannot be broken down in biological treatment processes because it is primarily:

• A. Is mostly inorganic
• B. Settles rapidly
• C. Settles slowly
• D. Is mostly organic

Answer: (A)

Grit cannot be broken down in biological treatment processes because it is primarily inorganic. Biological treatment relies on microorganisms to degrade organic matter for energy and carbon. Grit consists of minerals like sand and gravel that contain no organic carbon, so microbes cannot digest it or convert it into biomass or CO2. Because of its inorganic, nonbiodegradable nature, grit is handled by physical removal methods such as gravity settling and grit chambers rather than biodegradation. The other options point to how grit behaves physically (settling rates) rather than why it isn’t biologically degradable, which is why the inorganic nature is the correct reason.

Grit cannot be broken down in biological treatment processes because it is primarily inorganic. Biological treatment relies on microorganisms to degrade organic matter for energy and carbon. Grit consists of minerals like sand and gravel that contain no organic carbon, so microbes cannot digest it or convert it into biomass or CO2. Because of its inorganic, nonbiodegradable nature, grit is handled by physical removal methods such as gravity settling and grit chambers rather than biodegradation. The other options point to how grit behaves physically (settling rates) rather than why it isn’t biologically degradable, which is why the inorganic nature is the correct reason.