What is the BOD removal efficiency for RBDs?

The correct answer indicates that the Biological Oxygen Demand (BOD) removal efficiency for Residual Bio-solids Digestion (RBDs) is 85 percent. This value is significant in understanding the effectiveness of wastewater treatment processes. In this context, BOD is a measure of the amount of oxygen that bacteria will consume while decomposing organic matter in water. Removing a high percentage of BOD is crucial as it helps to improve water quality and minimizes the environmental impact of treated effluent released into water bodies.

Achieving an 85 percent removal efficiency reflects the capability of biological treatment methods typically employed in wastewater treatment plants, particularly those utilizing aerobic digestion processes. This efficiency is essential for ensuring that the treated effluent meets regulatory standards for water quality and helps protect aquatic environments.

In comparison, higher or lower percentages, such as 90 percent or 95 percent, might suggest either the use of advanced treatment technologies or less effective processes, respectively, while a lower percentage, like 75 percent, does not represent the generally expected performance for well-maintained systems. Hence, the 85 percent figure aligns well with industry standards and practices for effective wastewater treatment in many situations.