What is Chemical Oxygen Demand (COD)?
What is Chemical Oxygen Demand (COD)? Chemical Oxygen Demand (COD) is a measure of the amount of oxygen required to chemically oxidise the organic and inorganic substances in a water sample
Chemical Oxygen Demand (COD) is a measure of the amount of oxygen required to chemically oxidise the organic and inorganic substances in a water sample. COD is a commonly used parameter to assess the organic pollution in water and wastewater. It is a critical parameter for wastewater treatment facilities as it indicates the amount of oxygen needed for the oxidation of organic matter, including biodegradable and non-biodegradable materials.
COD tests are typically performed using a specialised instrument that measures the oxygen consumed in the oxidation of the organic and inorganic substances in a water sample using a strong oxidizing agent, usually potassium dichromate. The amount of oxygen consumed is then measured by titration, and the COD value is expressed in milligrams per liter (mg/L).
The COD test is an essential tool for evaluating the efficiency of wastewater treatment processes and assessing the quality of wastewater discharge. It is also used in the chemical industry to monitor organic pollutants in effluent streams and to design treatment processes to reduce the organic content of wastewater.
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