Table of Contents
- 1 What is the meaning of biological oxygen demand?
- 2 What is BOD and why is it important?
- 3 What is biological oxygen demand class 11?
- 4 How can I reduce my BOD?
- 5 Is high BOD good or bad?
- 6 What causes a high BOD?
- 7 Is high BOD bad?
- 8 What does biochemical oxygen demand mean?
- 9 What is the difference between BOD, COD or TOC?
- 10 What causes high BOD in wastewater?
What is the meaning of biological oxygen demand?
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.
What is BOD and why is it important?
Biochemical Oxygen Demand (BOD) 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. In STPs, BOD facilitates anaerobic processes but if there is large excess can lead to bacteria die.
What is good biological oxygen demand?
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 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.
How can I reduce my BOD?
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.
What is the difference between BOD and COD?
The main difference between BOD and COD is that BOD is the amount of oxygen which is consumed by bacteria while decomposing organic matter under aerobic conditions whereas COD is the amount of oxygen required for the chemical oxidation of total organic matter in water.
Is high BOD good or bad?
High BOD is harmful to ecosystems as fish and other aquatic life may suffocate in oxygen-depleted waters.
What causes a high BOD?
High biochemical oxygen demand can be caused by: high levels of organic pollution, caused usually by poorly treated wastewater; high nitrate levels, which trigger high plant growth.
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.
Is high BOD bad?
The greater the value, 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 does biochemical oxygen demand mean?
biochemical oxygen demand(Noun) The amount of oxygen needed by aerobic microorganisms to decompose all the organic matter in a sample of water; it is used as a measure of pollution.
How biological oxygen demand (BOD) affects the aquatic life?
When BOD of a water body increases significantly, the aquatic life is adversely affected . The oxygen used by aquatic organisms for respiration and metabolism is significantly reduced by the microbes for breaking down of organic waste. This results in the death of fishes and aquatic plants and complete disruption in the aquatic ecosystem.
What is the difference between BOD, COD or TOC?
COD or Chemical Oxygen Demand is the total measurement of all chemicals in the water that can be oxidized. TOC or Total Organic Carbon is the measurement of organic carbons. BOD or Biological Oxygen Demand is supposed to measure the amount of food (or organic carbons) that bacteria can oxidize.
What causes high BOD in wastewater?
Different pollutants (as stated above) will cause this. A high BOD in water meaning that you have a water with a great amount of microrganisms, mainly aerobic bacteria. This fact is very common in areas contaminated with wastewater or effluents of twater reatment plants.