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How is an oxygen sag curve created quizlet?

How is an oxygen sag curve created quizlet?

Oxygen sag curves occur when the oxygen dissolved in the water is depleted. This is caused by the addition of anything which increases the BIOLOGICAL OXYGEN DEMAND such as biological waste and sewage. they are found mostly in slow flowing streams.

What is an o2 sag curve?

Oxygen sag or the oxygen sag curve refers to the reduction in dissolved oxygen plotted over a distance along a water body from a point at which sewage or other pollutants have been discharged.

How does oxygen sag curve relate to biological oxygen demand?

The presence of sewage reduces the oxygen content of the water and increases the biochemical oxygen demand. This is due to the action of saprotrophic organisms that decompose the organic matter in the sewage and in the process use up the available oxygen.

What is oxygen deficit curve?

OXYGEN SAG: The oxygen sag or oxygen deficit in the stream at any point of time during self purification process is the difference between the saturation DO and DO content at that time. Oxygen Deficit, 9. ZONES OF POLLUTION IN THE STREAM 1.

What is an oxygen sag curve and how is it usually caused?

An oxygen sag curve occurs when oxygen is depleted just downstream of a pollution source. This happens when organic wastes are added to a clean river system. This is caused by the saprotrophic organisms that have to decompose the matter in the pollution and in the process use up the available oxygen.

What is by far the leading cause of water pollution?

Agricultural activities are by far the leading cause of water pollution. Stream pollution from industry and untreated sewage is a growing problem in developing countries.

What is a high BOD level?

Higher BOD indicates more oxygen is required, which is less for oxygen-demanding species to feed on, and signifies lower water quality. Unpolluted rivers usually have BOD levels below 1 part per million (equivalent to 1 mg/L), while untreated sewage has between 200 and 600 ppm.

What is the relationship between BOD and DO?

The amount of dissolved oxygen used up by aerobic microorganisms to decompose the organic matters present in a sample of water is termed Biochemical Oxygen Demand or Biological Oxygen Demand (BOD). BOD and DO are inversely proportional to each other i.e a decline in DO levels reflects a high level of BOD.

Do sag curves derive?

The derivation of the DO sag equation is the objective of this article. in which: D = biochemical oxygen demand (BOD) (mg/liter); Du = ultimate BOD immediately downstream of effluent discharge (mg/liter);

Do sag curves zone?

When pollutants (waste or excess fertilizer) enter the water, BOD and DO levels change, producing the oxygen sag curve. DO and BOD levels create characteristic zones in a stream around the point source of pollution known as the Clean zone, Decomposition Zone, Septic Zone, and Recovery Zone.

When do you use the oxygen sag curve?

oxygen sag curve The curve obtained when the concentration of dissolved oxygen in a river into which sewage or some other pollutant has been discharged is plotted against the distance downstream from the sewage outlet (see graph).

What does oxygen sag mean in self purification?

OXYGEN SAG: The oxygen sag or oxygen deficit in the stream at any point of time during self purification process is the difference between the saturation DO and DO content at that time. Oxygen Deficit, 9.

Why is oxygen sag important to water quality?

Oxygen sag is a key indicator of water quality and the effects of pollution. The EPA provides guidelines for the determination of water quality including procedures for field measuring techniques.

Why do saprotrophic organisms use up oxygen in sewage?

This is due to the action of saprotrophic organisms that decompose the organic matter in the sewage and in the process use up the available oxygen. Pick a style below, and copy the text for your bibliography. ” oxygen sag curve . ” A Dictionary of Biology . . Encyclopedia.com. 15 Apr. 2020 < https://www.encyclopedia.com > . “oxygen sag curve .”

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