The COD (Chemical Oxygen Demand) is closely related to the laboratory standard method named Dichromate-Method. With this method, the chemical oxygen demand is determined during chromic acid digestion of organic loads in wastewater. Based on this method the COD became a commonly used sum parameter in wastewater analysis. It is used for the planning of wastewater treatment plants, for controlling the cleaning efficiency, and for the calculation of wastewater taxes.
The chemical oxygen demand (COD) indicates the amount of oxygen that is needed for the oxidation of all organic substances in water and is thus an important indicator for water analysis. It is considered in the planning and controlling of treatment, as well as assessing its efficiency, thus forming the basis for the calculation of wastewater charges.
The COD can be determined in a laboratory or online, whereby these methods significantly differ in duration and consumables used.