Which of the following is classified as a conventional pollutant?

Conventional pollutants are substances that are commonly found in wastewater and are regulated due to their significant impact on water quality and aquatic life. Oil and grease fall into this category because they can cause a range of environmental issues, including harm to aquatic ecosystems and interference with water treatment processes. They are typically generated by industrial processes, vehicle emissions, and household waste, making them prevalent in effluent discharges.

The classification of oil and grease as a conventional pollutant reflects the focus on managing substances that are routinely monitored and controlled in wastewater treatment facilities. Their presence in water bodies can lead to oxygen depletion, toxicity to aquatic organisms, and the formation of harmful films on the surface of water, further underscoring their environmental significance.

By identifying oil and grease as a conventional pollutant, regulatory agencies can apply specific standards and treatment technologies designed to reduce these substances in discharges, thus supporting cleaner water practices.