Trending. 1  Apple is about to dramatically change the way you use an iPhone The trusty home button is going away. 2  Apple to FCC: Protect net neutrality and donât allow online fast lanes Itâs the companyâs first comments in the 2017 debate.
COD or Chemical Oxygen Demand definition. Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as Ammonia and nitrite.
BOD test bottles at the laboratory of a wastewater treatment plant. Biochemical oxygen demand (BOD, also called biological oxygen demand) is the amount of dissolved oxygen needed (i.e., demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.