Environmental Engineering Calculators

In environmental chemistry, the chemical oxygen demand (COD) is an indicative measure of the amount of oxygen that can be consumed by reactions in a measured solution.

To determine Aggregate Organic Constituents test of drinking water & waste water for Biochemical Oxygen Demand.

Principle: Biological oxygen demand is defined as the amount of oxygen required bacteria in decomposing organic material in a sample under aerobic condition at 20 °C over a period of 5 days.

Ammoniacal nitrogen (NH3-N) is a measure for the amount of ammonia, a toxic pollutant often found in landfill leachate and in waste products, such as sewage, liquid manure and other liquid organic waste products.