What Does High BOD Value In Water Indicate?

What does high value of BOD biochemical oxygen demand indicate?

-If the value of the Biochemical oxygen demand of any water sample will be high, then it will indicate that a large amount of oxygen has been consumed to decompose the organic matter by the microorganisms..

Is high BOD in water good?

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 is the BOD of drinking water?

For drinking water BOD has to be less than 5 mg/L and for treated wastewater to be disposed of in the water bodies it is 30 mg/L, 100 mg/L if treated waste water is discharged into the sewerage system in India.

What is BOD Toppr?

Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period. Answer verified by Toppr.

How do you reduce BOD in water?

These are the best practices for reducing BOD and TSS that facility managers should know:Focus on removing TSS from wastewater first. … Get a properly sized EQ tank. … Control the pH of the waste stream. … Install a modern plate pack DAF made of stainless steel or plastic. … Use a regenerative turbine air dissolution pump.More items…•16 Aug 2018

What is the value of BOD of good quality water?

Typical values Most pristine rivers will have a 5-day carbonaceous BOD below 1 mg/L. Moderately polluted rivers may have a BOD value in the range of 2 to 8 mg/L. Rivers may be considered severely polluted when BOD values exceed 8 mg/L.

What is BOD and SS?

The next topic in our Sewage Treatment Parameters Education Series is Suspended Solids (SS) which is usually stated in conjunction with Biochemical Oxygen Demand (BOD). … Suspended Solids are normally reduced by both physical means such as settlement and also by biological treatment.

What is the value of bod?

100ppmAccording to standards of Central Pollution Control Board, permissible value of BOD is 100ppm and COD is not mentioned.

What is BOD and do as properties 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. … The decay of organic matter in water is measured as biochemical or chemical oxygen demand.

What does high BOD indicates in the body of water?

High BOD indicates the great amount of organic matter. The dissolved oxygen in water is consumed by bacteria to decompose the organic matter of sewage or other discharges thereby depleting the oxygen of the water body. … Hence, the correct answer is ‘Being contaminated with sewage’.

What causes increased bod?

Laboratory experiments indicate that BOD is not influenced by water temperature at the time of sampling or by enrichment with nitrate or ammonia. Rather, enrichment with macrophyte leachate sharply increases BOD, and enrichment with phosphate produces a small but significant increase in BOD.

What factors can influence an increase or decrease of BOD?

The factors that affect the dynamics of DO-BOD concentrations are total populations, the number of paddy fields, the number of livestock and rainfall. Keywords: River pollution, DO, BOD, Organic waste, domestic waste.

Does BOD increase with temperature?

The BOD removal rate in the bioreactor increased when the temperature increased from 20 degrees C to 30 degrees C, 40 degrees C, and 50 degrees C, but it decreased when the temperature increased from 50 degrees C to 60 degrees C. Higher temperature enhanced the endogenous respiration of microbes in the bioreactor.

What is the relation 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.

Why is bod done for 5 days?

A sample of water with lesser BOD value is less polluted than a one with much higher value. … 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.

What happen if BOD is high?

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. The consequences of high BOD are the same as those for low dissolved oxygen: aquatic organisms become stressed, suffocate, and die.

What is a good BOD level?

1-2 ppmA BOD level of 1-2 ppm is considered very good. There will not be much organic waste present in the water supply. A water supply with a BOD level of 3-5 ppm is considered moderately clean.

Why is COD higher than BOD?

COD stands for ‘Chemical Oxygen Demand’ where BOD stands for Biochemical Oxygen Demand. … COD is normally higher than BOD because more organic compounds can be chemically oxidised than biologically oxidised.

What is the BOD value of pure water?

1ppmAnswer. The BOD of pure water is 1ppm and if it is greater than 17ppm then it is polluted water.

Which level of beauty indicate that water is polluted?

Clean water has BOD which is less than 5 ppm. If it is equal to or more than 12 ppm, then the water is considered as polluted.