bod

1. BOD stands for "Biochemical Oxygen Demand," and COD stands for "Chemical Oxygen Demand.“ Imagine
a river or a pond where fish and other aquatic creatures live. They need oxygen to survive, just like we do
when we breathe. BOD and COD are measurements that help us understand how polluted the water is.
BOD (Biochemical Oxygen Demand): BOD tells us how much oxygen is needed by bacteria and other tiny
organisms in the water to break down organic matter (like waste from plants, animals, and humans). When
there's a lot of organic waste in the water, these organisms work hard to break it down, using up oxygen in the
process. If there's too much waste, they use up too much oxygen, which can be bad for the fish and other
creatures that need it. So, a high BOD value means the water might not be very clean for aquatic life.
COD (Chemical Oxygen Demand): COD is a bit broader. It measures the amount of oxygen needed to
chemically break down all the organic and some inorganic substances in the water. This includes things like
pollutants from industries, chemicals, and other harmful stuff that might be in the water. High COD levels
could indicate that there are a lot of different pollutants present, which might make the water unsafe for
living things.
In simple words, both BOD and COD help us figure out how dirty or polluted the water is by showing us how
much oxygen is being used up to clean it up naturally or chemically. Clean water has lower BOD and COD
levels, while polluted water has higher levels, which can harm the aquatic environment.