Question

In sewage water, which of the following is expected to be present in the highest quantity (mg/L)?

• A. Dissolved oxygen
• B. Chemical oxygen demand
• C. Carbonaceous biochemical oxygen demand
• D. Nitrogenous biochemical oxygen demand

Hint:

COD is a key parameter in water quality analysis, often exceeding other oxygen demand indicators.

Answer 1

The Correct Option is B

1. Chemical oxygen demand (COD) represents the total amount of oxygen required to oxidize organic and inorganic matter, and it is the highest in sewage water.
2. Dissolved oxygen (DO) is usually low in sewage due to microbial activity.