What is the significance of COD?
COD is a measure of the oxygen equivalent of the organic matter in a water sample that is susceptible to oxidation by a strong chemical oxidant. COD is widely used as a measure of the susceptibility to oxidation of the organic and inorganic materials present in water bodies and in the municipal and industrial wastes.
What is BOD and COD in wastewater PPT?
Oxygen Demand – It is a measure of the amount of “reduced” organic and inorganic matter in a water – Relates to oxygen consumption in a river or lake as a result of a pollution discharge – Measured in several ways BOD – Biochemical Oxygen Demand COD – Chemical Oxygen Demand Dissolved oxygen. 7.
What is BOD and its significance Class 12?
BOD stands for Biological Oxygen Demand. It is the amount of dissolved oxygen required by aerobic organisms to break down organic material present in the water. It indicates the amount of organic pollution present in an aquatic ecosystem.
What is the principle of BOD?
BOD is based on the principle that if sufficient oxygen is available, aerobic biological decomposition (i.e., stabilization of organic waste) by microorganisms will continue until all waste is consumed.
What are the advantages of cod over BOD?
However, COD does have a big advantage over BOD in that the test only takes approximately three hours, as opposed to the five days required for BOD testing and it is usually possible over a period of time to establish a ratio of BOD: COD, which allows extrapolation of the BOD.
What is the relationship between BOD, COD and TOC?
COD or Chemical Oxygen Demand is the total measurement of all chemicals in the water that can be oxidized. TOC or Total Organic Carbon is the measurement of organic carbons. BOD or Biological Oxygen Demand is supposed to measure the amount of food (or organic carbons) that bacteria can oxidize.
What does BOD stand for?
What Is Biological Oxygen Demand in Wastewater Treatment? Biochemical oxygen demand or biological oxygen demand (BOD) is a measure of the amount of Dissolved Oxygen (DO) required by aerobic microorganisms to decompose organic matter present in a sample of water at a certain temperature over a studied period.