What does BOD mean in water pollution?

What does BOD mean in water pollution?

Biological oxygen demand
Biological oxygen demand (BOD) generally represents how much oxygen is needed to break down organic matter in water.

Why is it called BOD?

Water Quality Monitoring in Aquaculture BOD, also called biological oxygen demand, is the amount of dissolved oxygen needed (i.e., demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.

What is BOD Ncert?

Biological Oxygen Demand is defined as the amount of dissolved oxygen required by aerobic microorganisms to breakdown the organic materials in a sample of water at a specific temperature & timeframe.

How is BOD of water determined?

Biological Oxygen Demand (BOD): Therefore it is used to measure the amount of certain type of organic water pollution BOD is calculated by keeping a sample of water containing a known amount of oxygen for five days at 20 °C. The oxygen content is measured again and BOD is calculated.

What causes BOD in water?

BOD directly affects the amount of dissolved oxygen in rivers and streams. Sources of BOD include leaves and woody debris; dead plants and animals; animal manure; effluents from pulp and paper mills, wastewater treatment plants, feedlots, and food-processing plants; failing septic systems; and urban stormwater runoff.

How does BOD influence water quality?

Higher BOD indicates more oxygen is required, which is less for oxygen-demanding species to feed on, and signifies lower water quality. Inversely, low BOD means less oxygen is being removed from water, so water is generally purer.

What pollution is measured by BOD?

Water pollutants are measured by BOD.

How does BOD affect water quality?

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 happens when water has high BOD?

What is the BOD level of water pollution?

BOD level is a common metric for water pollution. The BOD level is determined by comparing the dissolved oxygen levels of a water sample before and after 5 days of incubation in the dark (see the next section for this). The difference between the two DO levels represents the amount of oxygen required for the decomposition

What is the meaning of the BOD value of oxygen?

BOD value is usually expressed in milligrams of oxygen per liter of water (mg/L). What Is Dissolved Oxygen? Dissolved Oxygen is the amount of gaseous oxygen dissolved in a sample of water.

What is the function of the BOD in wastewater treatment?

BOD can be used as a gauge of the effectiveness of wastewater treatment plants. It is listed as a conventional pollutant in the U.S. Clean Water Act. BOD is similar in function to chemical oxygen demand (COD), in that both measure the amount of organic compounds in water. However, COD is less specific,…

Is BOD-COD ratio a good indicator for pollution measurement in River?

Results of the investigation revealed that BOD: COD ratio is a good indicator for pollution measurement in river. It can be used as an indicator to predict the relationship of BOD and COD in the river. It is also found to be reliable and useful indicator to relate organic matter content in the river water.