Organic Oxygen Demand (BOD) The level of oxygen, taken up because of the microorganisms that decompose the organic and natural waste subject in wastewater is called Organic oxygen demand or biochemical oxygen demand.

Chemical oxygen demand is definitely an index of pollution that steps the outcome of pollutants on dissolved oxygen. While in the COD test, an oxidant aside from O2 is utilized to degrade the pollutants in the water sample.

The dichromate method is actually a commonly utilised process for measuring COD. It involves incorporating a identified excess of potassium dichromate to some regarded volume of sample while in the presence of sulfuric acid.

COD is most fitted for speedy and Regular checking of procedure plant efficiency and h2o top quality.

The dichromate oxidizes the natural and organic subject inside the sample, and the excess dichromate is then titrated having a lessening agent to ascertain the quantity of dichromate that was consumed.

Digestion is performed about the samples which has a established number of the oxidant, sulfuric acid, and warmth (150°C). Steel salts are generally included to suppress any interferences and to catalyze the digestion. This digestion usually will take two hrs to carry out.

BOD refers to the biological oxygen demand, which actions the amount of dissolved oxygen (DO) necessary by aerobic organisms (oxygen demand) to break down natural and organic waste substance existing in the offered water sample at a presented temperature and specified time.

The leading difference between BOD and COD is the fact BOD is the quantity of oxygen that may be consumed by micro organism even though decomposing natural and organic make a difference underneath aerobic situations Whilst COD is the level of oxygen needed to the chemical oxidation of total natural & inorganic subject in H2O.

Electrodes: read more Electrodes are important elements of electrochemical measurements. They are generally product of conductive elements, including metals or metallic oxides, and they are intended to connect with the analyte of fascination.

COD means “Chemical Oxygen Demand” and is particularly a evaluate of the quantity of oxygen needed to chemically oxidise organic substances in water including ammonia or nitrate, in purposes which include lakes, rivers or wastewater which have been contaminated by domestic or industrial waste.

This can be calculated by slowly adding a coloured indicator that reacts Together with the dichromate. The resulting colour will improve when there is absolutely no extra dichromate to react. This conclude level is monitored possibly visually or read more by using photometry, and the quantity of indicator utilised can be employed to work out the first COD content.

Hanna Suggestion: As a result of pace of testing, services generally build a correlation in between BOD and COD, then only operate BOD often. Nevertheless, make sure you Examine with your local regulatory agency for specific suggestions on BOD and COD testing regimens.

To evaluate COD, the water sample is positioned inside of a closed container and subjected to your strong oxidant, including potassium dichromate and sulfuric acid, for the required duration and temperature.

High COD concentrations can reveal a higher volume of organic and natural pollutants while in the wastewater, which may be dangerous into the setting and human well being. Hence, lowering the COD in wastewater before it can be discharged is a major objective of wastewater procedure processes.