What does Bod stand for?

BOD, COD, DO, TSS are indicators of domestic quality. In the process of decomposing organic matter in ponds, lakes and wastewater tanks, how to reduce these indicators is of great interest.

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So the indicators? What is BOD? What is COD? What is DO, TSS? Relationship between COD and BOD how? Let’s find the answers to these questions through the content of the article below!


1. What is BOD? What does BOD mean?

BOD stands for Biochemical (or Biological) Oxygen Demand – is the amount of dissolved oxygen in water for organisms to break down organic matter in wastewater. And it is also the amount of dissolved oxygen needed for the respiration of organisms such as fish, aquatic organisms, and microorganisms.

Bacteria, organic matter + O2 -> CO2 + H2O + new cells + intermediate products

BOD is created as a result of human activities and wastes such as food, organic matter in sewers. This is very normal, it helps the water source have more organic substances, sustaining the life of aquatic organisms.

However, if the BOD concentration is too high, the discharge into untreated water will contaminate the water source. Therefore, people consider and take BOD as an indicator of wastewater quality. From there, there are measures to reduce BOD in water.

By convention, BOD is calculated as the difference in oxygen in mg/liter of water. And here are some BOD parameters of wastewater types:

– Domestic water: 100 – 200mg/l

– Seafood processing: 2,000 – 5,000 mg/l

– Brewing: 800 – 2,000 mg/l

– Rubber production: 3,000 – 10,000 mg/l

– Textile dyeing: 500 – 3,000 mg/l


BOD5: To oxidize all organic matter in water will take up to 20 days at 20 degrees Celsius. For simplicity, people will take the value of BOD that has oxidized for 5 days, or BOD5. At this time, the BOD index in the water has decreased by 80%.

BOD is tested by diluting the water sample with deionized water and saturated with oxygen, then adding a fixed amount of microorganisms, and then tightly covering the sample to prevent oxygen from entering the interior. After the lid is closed, the samples should be kept in the dark at a temperature of about 20 degrees Celsius to prevent photosynthesis for 5 days.

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2. COD

COD stands for Chemical Oxygen Demand – is the total organic matter present in wastewater and also the amount of oxygen required to oxidize chemical compounds in water including inorganic and organic.

The COD index is widely used to indirectly measure the mass of organic compounds present in water. When analyzing COD, it has a similar function to BOD, because both measure organic compounds in water. And this is also the relationship of COD and BOD that you should know

You may be interested: TDS is also one of the important water quality indicators like BOD, COD, DO and TSS.

3. DO

DO stands for Dessolved Oxygen which is the amount of dissolved oxygen in water required for the respiration of aquatic organisms in the water. Therefore, Do can assess the level of organic pollution in water.

The concentration of free oxygen in water is in the range of 8-10 ppm and fluctuates strongly depending on temperature, chemical decomposition, algae photosynthesis, etc.

There are two methods of determining Therefore:

Winkler method (chemistry)

– Dissolved oxygen electrode method – oximeter

4. What is TSS?

TSS stands for Turbidity & Suspendid Solids – is the total suspended solids in water. This indicator is usually obtained with a turbidimeter. Turbidity is caused by the interaction between light and suspended substances in water such as sand, clay, algae and microorganisms as well as organic matter in the water.

Suspended solids scatter light and absorb it to reflect it back to matter depending on the size, shape and composition of the suspended particles.

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Those are 4 domestic indicators that you should know when learning about wastewater. Green hope you will know What is BOD? What is TSS? What is the relationship between COD and BOD? What helps you better understand these quality metrics.

Source: internet

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