What is biological oxygen demand simple definition?

BOD is a measure of the amount of oxygen required to remove waste organic matter from water in the process of decomposition by aerobic bacteria (those bacteria that live only in an environment containing oxygen).

What is BOD and why is it important?

The BOD is an important parameter for assessing water quality. It deals with the amount of oxygen consumption (mg O2 L− 1) by aerobic biological organisms to oxidize organic compounds. Sewage with high BOD can cause a decrease in oxygen of receiving waters, which in turn can cause the death of some organism.

What is biochemical oxygen demand quizlet?

Biochemical Oxygen Demand (BOD) A measure of the amount of oxygen necessary to decompose organic material in a unit volume of water. As the amount of organic waste in water increases, more oxygen is used, resulting in a higher BOD.

What is biochemical and oxygen demand?

Biochemical oxygen demand (BOD) is the amount of oxygen required by the microorganisms to break down the organic materials, whereas chemical oxygen demand (COD) is the amount of oxygen required to break down the organic material via oxidation.

What do you mean by COD?

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Cash on delivery (COD) is a type of transaction where the recipient pays for a good at the time of delivery rather than using credit. The terms and accepted forms of payment vary according to the payment provisions of the purchase agreement.

What is biological oxygen demand class 11?

Biochemical oxygen demand: It is the amount of oxygen required by bacteria to carry out the decomposition of the organic matter present in a certain volume of a sample of water. It gives us an idea of the amount of organic matter present in water. Lesser the BOD in water, the more clean it would be.

What are the advantages of BOD?

The main advantages of this method compared to the dilution method are: simplicity: no dilution of sample required, no seeding, no blank sample. direct reading of BOD value. continuous display of BOD value at the current incubation time.

Which part of the water supply is most isolated from the purifying capacity of the water cycle?

down the drain. Which part of the water supply is most isolated from the purifying capacity of the water cycle? Volatile organic compounds (VOC) make up one category of contaminants in groundwater.

What is COD in simple words?

COD is the oxygen demand that is consumed by both inorganic and organic matter present in the wastewater sample. The chemical oxygen demand is expressed as the mass of oxygen consumed over the volume of the solution. Its SI unit is milligrams per liter (mg/l).

What is difference between biological oxygen demand and Biochemical Oxygen Demand?

COD is closely related to BOD or Biochemical Oxygen Demand, the difference being that BOD is a test of the level of organic matter that can be biologically oxidised while COD is a test of the amount of organic matter that can be chemically oxidised.