Determination of Biochemical Oxygen Demand

determination of biochemical oxygen demand

What is Biochemical oxygen demand (BOD) ? Biochemical oxygen demand is used as a measure of the quantity of oxygen required for oxidation of Biodegradable organic matter present in water samples by aerobic biological action. The oxygen demand of wastewater is exerted by three classes of materials. 1. Carboneous organic materials are used as a … Read more

Modulus of elasticity of concrete – Determination & Explanation

The modulus of elasticity is the material characteristic value for the elastic deformation(strain) behavior of a material subjected to pressure, force, or tension expressed in kN/mm² or N/mm². The modulus of elasticity indicates the ratio of stress to the associated elastic deformation.  Modulus of Elasticity (E) = Stress/Strain It is therefore defined by the relationship … Read more