BOD and COD - Water - Engineering Chemistry 1

TL;DR

BOD measures the amount of oxygen needed for the decomposition of organic matter in water, indicating the level of pollution. COD measures the amount of oxygen required by organic matter in water for oxidation by a strong oxidizing agent.

Transcript

click the Bell icon to get latest videos from Ikeda hello friends in today's session we are going to study about bo d that is biochemical oxygen demand and Co D that is chemical oxygen demand now what exactly are these terms whenever I have certain material present in the water as impurities they can be organic or inorganic but if at all they are o... Read More

Key Insights

• 💦 BOD and COD measurements help determine the extent of pollution in water samples.
• 💦 BOD is used to calculate the amount of waste present in water, which depletes oxygen levels.
• 🤽 BOD and COD play a crucial role in designing water treatment plants and deciding the disposal of domestic effluents.
• ✋ High BOD levels indicate higher pollution, and low BOD levels are desired in drinking water.
• 💦 COD measurements aid in reducing organic matter and strong oxidizing agents in water bodies.

Questions & Answers

Q: What is the difference between BOD and COD?

BOD measures the oxygen required for the biological oxidation of organic matter, while COD measures the oxygen needed for oxidation by a strong oxidizing agent.

Q: How are BOD and COD useful in controlling pollution?

By measuring BOD and COD levels, industries can implement filtration systems to reduce pollution in wastewater before it is released into rivers or seas.

Q: What does a higher BOD level indicate?

A higher BOD level indicates a higher amount of decomposable organic matter in the water, signaling a higher level of pollution.

Q: Why is it important to measure BOD and COD in sewage samples?

Measuring BOD and COD in sewage samples provides an idea of the extent of pollution present at any given time, aiding in pollution control efforts.

Summary & Key Takeaways

• BOD is the amount of oxygen used for the biological oxidation of organic matter under aerobic conditions in water.

• COD is the amount of oxygen required by organic matter in water for its oxidation by a strong oxidizing agent.

• Both BOD and COD are important in determining the extent of pollution in wastewater and industrial effluents.