Chemical oxygen demand (cod) of sewage is the : a) oxygen required to oxidise biologically active organic mailer b) oxygen required to oxidise biologically inactive organic mailer c) (a) and (b) both d) none of the above
Answers
Explanation:
In environmental chemistry, the chemical oxygen demand (COD) is an indicative measure of the amount of oxygen that can be consumed by reactions in a measured solution. It is commonly expressed in mass of oxygen consumed over volume of solution which in SI units is milligrams per litre (mg/L). A COD test can be used to easily quantify the amount of organics in water. The most common application of COD is in quantifying the amount of oxidizable pollutants found in surface water (e.g. lakes and rivers) or wastewater. COD is useful in terms of water quality by providing a metric to determine the effect an effluent will have on the receiving body, much like biochemical oxygen demand (BOD).
Chemical oxygen demand (cod) of sewage is the : a) oxygen required to oxidise biologically active organic mailer b) oxygen required to oxidise biologically inactive organic mailer c) (a) and (b) both d) none of the above
Biochemical oxygen demand is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.