Which of the following are considered conventional pollutants?

Conventional pollutants are typically defined as those pollutants that are commonly found in wastewater and are known to have widespread negative impacts on water quality and aquatic life. They usually include parameters that are regulated under the Clean Water Act and are associated with sewage treatment processes.

The correct choice identifies BOD (Biochemical Oxygen Demand), Oil and Grease, and Suspended Solids as conventional pollutants. BOD is a critical measure of the organic material in water that can be biologically degraded, serving as an indicator of the strength of wastewater. Oil and Grease contribute to water quality issues, affecting aquatic ecosystems and causing harmful environmental effects. Suspended Solids are particles that can cloud water, impact light penetration, and harm aquatic organisms by clogging gills or providing surfaces for pathogens.

The other options consist of pollutants that are classified differently. For example, carbon monoxide and nitrogen oxides primarily pertain to air quality rather than water treatment. Heavy metals and pesticides are categorized as toxic pollutants due to their harmful effects on health and the environment, but they do not fit within the conventional pollutants category which focuses on organic and suspended materials in water. Volatile organic compounds are also recognized as toxic pollutants rather than conventional pollutants.

Understanding the classification of these pollutants is important in