What is the 5 day BOD?

What is the 5 day BOD?

Method Description: The five day BOD is an indicator of how much oxygen is utilized by a natural water sample (phytoplankton and bacteria) in five days at 20 degrees C.

What does BOD actually measure?

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).

Why does BOD increase?

The environmental factors contributing to increasing BOD include surface runoff, floating debris, dead animal and plants, soil erosion, etc. There are few chemicals that affect the BOD of drinking water. One of these is phosphate, which when present in high amount increases the BOD of water.

What is the effect of increasing or decreasing of BOD value?

BOD directly affects the amount of dissolved oxygen in rivers and streams. The greater the BOD, the more rapidly oxygen is depleted in the stream. This means less oxygen is available to higher forms of aquatic life.

What is the reason for taking 5 days BOD as standard?

The reason for taking 5 days BOD as standard is due to the following fact: The “Dissolved Oxygen” present in water gets used for the decomposition of organic matter as well as nitrogenous matter. From the combined BOD curve, we have two oxygen demands: 1. COD stands for ‘Chemical Oxygen Demand’ where BOD stands for Biochemical Oxygen Demand.

What is the significance of 5 day incubation period for BOD test?

Also for 5 days incubation period test results were close to onsite conditions and a safe margin error due to inclusion of oxygen required by nitrifying bacteria. Later this was widely adopted as a standard for carbonaceous oxygen demand i.e. BOD. Higher the BOD value higher is the water polluted.

Why is the BOD of water 5 days?

Higher the BOD value higher is the water polluted. The reason for taking 5 days BOD as standard is due to the following fact: The “Dissolved Oxygen” present in water gets used for the decomposition of organic matter as well as nitrogenous matter. From the combined BOD curve, we have two oxygen demands: 1.

How do you measure BOD value?

In Laboratory, The BOD value is measured by measuring the difference of dissolved oxygen (DO) of the sample after 5 days of incubation at 20 degrees centigrade. The answer to this question is among the basic building blocks of Environmental Engineering, Yet…