What is Biological oxygen demand and Carbonic oxygen demand in STP Plant.

Question

Accepted Answer

Biological oxygen demand (BOD) and Chemical oxygen demand (COD) are important parameters in wastewater treatment plants.

Biological oxygen demand (BOD) is a measure of the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material in water.
Carbonaceous oxygen demand (COD) is a measure of the amount of oxygen required to oxidize all the organic and inorganic matter in water.
BOD is a more specific and accurate indicator of organic pollution in water, while COD gives a broader measure of pollution.
BOD is usually measured over a 5-day period (BOD5), while COD is measured in a shorter time frame.
Both BOD and COD are important in determining the efficiency of a sewage treatment plant in removing organic pollutants.

Top Colliers India Senior Engineer interview questions & answers