Swachh Bharat Mission: Understanding BOD and COD in Wastewater

 


WHAT IS BOD?

Biological/Biochemical Oxygen Demand (BOD) is an essential metric in wastewater treatment processes to assess how effective the treatment process is. If BOD levels are too high they indicate insufficient treatment.

👉 More waste in water = More oxygen used by bacteria

THE PROBLEM

❌ Open defecation
❌ Wastewater flowing into drains & ponds
❌ No treatment of household waste

➡️ Leads to HIGH BOD
➡️ Water becomes dirty & unsafe


WHY IT MATTERS

⚠️ Less oxygen for fish & aquatic life
⚠️ Spread of diseases
⚠️ Unsafe water for daily use

THE SOLUTION 

✅ Use toilets – Keep villages ODF
✅ Proper waste disposal
✅ Soak pits & septic tanks
✅ Liquid Waste Management systems

THE RESULT

✔️ Less waste in water
✔️ Lower BOD levels
✔️ Clean & healthy water bodies


Chemical Oxygen Demand (COD): It is a measure of how much oxygen is required to chemically break down pollutants in water.




In simple terms:

  • It tells you how polluted the water is
  • It measures both biodegradable and non-biodegradable waste
  • The higher the COD, the more contaminated the water

Quick takeaway:

👉 High COD = High pollution = Poor water quality
👉 Low COD = Cleaner, safer water

Why it matters:

High COD reduces oxygen in water, which can harm aquatic life and make water unsafe for use.

One-line understanding:

COD shows the total pollution load in water by measuring how much oxygen is needed to clean it.



SLOGAN:

“Stop Waste from Reaching Water – Save Oxygen, Save Life!”


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