How does BOD determine the pollution of water?

How does BOD determine the pollution of water?

Biochemical oxygen demand (BOD) represents the amount of oxygen consumed by bacteria and other microorganisms while they decompose organic matter under aerobic (oxygen is present) conditions at a specified temperature. When you look at water in a lake the one thing you don’t see is oxygen.

How do you measure chemical oxygen demand in water?

The most common test method is the colorimetric analysis after oxidizing the COD with acid and using indicator compounds, such as hexavalent dichromate. In some instances, however, there are compounds that will interfere with the colorimetric analysis, and titration is required to determine COD levels.

How is biochemical oxygen demand determined?

Measuring biochemical oxygen demand requires taking two measurements. One is measured immediately for dissolved oxygen (initial), and the second is incubated in the lab for 5 days and then tested for the amount of dissolved oxygen remaining (final).

How is biochemical oxygen demand measured?

What is chemical oxygen demand how is it determined?

COD is defined as the amount of oxygen equivalents consumed in the chemical oxidation of organic matter by strong oxidant (e.g., potassium dichromate).

How is BOD measured and calculated?

BOD is computed based on the difference between initial and final D.O. The test uses dilution water and a known amount of sample in a 250-300 ml incubation bottle. The initial D.O. is measured by probe and the bottle is stored at 20 °C. After five days, final D.O. is measured.

What is a BOD Incubator?

BOD Incubator (Bio-Oxygen Demand) are used to maintain temperature for test tissue culture growth, storage of bacterial cultures and incubation where high degree of constant temperature accuracy is required. Thermolab BOD Incubators provide accurate conditions and uniformity throughout the chamber.

What is BOD and How Is It measured?

The BOD test is a bioassay technique involving the measurement of oxygen consumed by the bacteria while stabilizing the organic matter in the waste as they would normally do in nature but under normal laboratory conditions. By convention, the test is conducted for a period of 5 days at 20°C (68°F).

What is measured by BOD test?

The test for biochemical oxygen demand (BOD) is a bioassay procedure that measures the oxygen consumed by bacteria from the decomposition of organic matter (Sawyer and McCarty, 1978). The change in DO concentration is measured over a given period of time in water samples at a specified temperature.

What is biochemical oxygen demand (BOD)?

Biochemical Oxygen Demand or BOD gives a measure of the amount of oxygen that the microbes utilize to degrade organic materials in a water body. Also, BOD measures the chemical oxidation of inorganic materials i.e., the removal of oxygen from water via a chemical reaction.

What is biological oxygen demand of water?

It indicates the polluting potential of water. BOD is used in medical and pharmaceutical industries to measure the oxygen consumption of cell cultures. Sources that increase Biological Oxygen Demand of water are both natural and man-made. Pollution is a major contributor to increasing the BOD of water bodies.

Why is it important to reduce the biochemical oxygen demand?

Ans. It is extremely important to reduce the biochemical oxygen demand of water bodies or wastewater before discharging into water bodies because high BOD of water means more and more oxygen is utilized by the aerobic bacteria for breaking down the organic waste in the water.

What is the relationship between BOD and pollution?

The more the BOD of a water body or water sample, the more it is polluted. The increase in organic matter can be due to environmental factors but are mostly due to anthropogenic causes like pollution. BOD is used as an index for measuring water quality.