What test is typically used to measure the organic strength of wastewater?

The biochemical oxygen demand (BOD) test is the standard method for measuring the organic strength of wastewater. BOD quantifies the amount of oxygen that microorganisms will consume while decomposing organic matter in a sample over a specified period, typically five days at a temperature of 20°C. This measurement reflects the degree of pollution or organic load present in the wastewater, making it a crucial parameter in assessing the potential impact of wastewater on receiving environments.

BOD is particularly important for the design and operation of wastewater treatment systems, as it helps determine the necessary treatment process and capacity. A higher BOD value indicates a greater amount of organic pollutants, necessitating more thorough treatment to prevent environmental harm.

Tests for total suspended solids (TSS) and dissolved oxygen (D.O.) are also important in wastewater management but serve different purposes. TSS measures the total concentration of solid particles in the water, while D.O. indicates the amount of oxygen available for aquatic life. The pH test assesses the acidity or alkalinity of the wastewater but does not provide insight into the organic strength. Therefore, BOD remains the primary indicator specifically for the organic strength within wastewater analysis.