MCQ Detailed View

Organic pollution in water happens when organic substances like sewage, food waste, or industrial effluents enter rivers, lakes, or ponds. These substances increase the demand for oxygen in water, which can harm aquatic life if not monitored.

COD (Chemical Oxygen Demand) is the standard method used to measure organic pollution. It indicates the total oxygen required to chemically oxidize organic compounds in water. A high COD value means more organic matter is present, showing high pollution levels. COD is widely used because it provides a quick and reliable estimate of organic pollution, even for compounds that are hard to break down biologically.

Other parameters do not directly measure organic pollution. DO (Dissolved Oxygen) shows the oxygen available for aquatic life but does not quantify total organic content. pH indicates acidity or alkalinity, which is unrelated to organic pollution. Salinity measures dissolved salts, not organic matter.

Measuring COD is essential for water quality monitoring, wastewater treatment, and pollution control. It helps scientists, students, and environmental engineers understand the impact of organic pollutants and maintain healthy water ecosystems. Proper COD measurement ensures that water remains safe for humans, animals, and plants, supporting ecological balance and environmental sustainability