fast and simple online determination of cod

It is measured in mg/l.īOD is determined for designing treatment facilities. The standard BOD test determines the amount of oxygen required by the micro-organisms for the decomposition of the bio-degradable matter present in the wastewater sample under 5 days of aerobic condition at a temperature of 20 degree Celsius. The strength of municipal or organic quality of the water. This is the most commonly used parameter to determine Micro-organisms in the sewage for the decomposition of bio-degradable matter Biological Oxygen Demand (BOD)īOD is defined as the amount of oxygen demanded by the Its SI unit is milligrams per liter (mg/l). The chemical oxygen demand is expressed as the mass of oxygen consumed over the volume of the solution. COD is the oxygen demand that is consumed by both inorganic and organic matter present in the wastewater sample. To determine COD, the sample water is taken in a closed container and incubated with a strong oxidant like potassium dichromate with sulphuric acid under standard conditions of temperature and time. This is the only method that enables to determine the organic load in heavy toxic sewage. The presence of COD facilitates rapid chemical oxidation of organic matter without any additional equipment. is called as chemical oxygen demand (COD). The amount of oxygen that is required for the chemical oxidation of the organic and inorganic chemicals present in the wastewater by utilising oxidising agents like Potassium permanganate, Potassium dichromate etc. The basic features of COD, BOD and their basic differences are explained in this article. Both the parameters test the oxygen-demanding strength of the wastewaters. Chemical Oxygen Demand (COD) and Biological Oxygen demand (BOD) are the two main characteristic properties that indicate the strength of sewage.

Fast and simple online determination of cod