What is the typical BOD removal efficiency for trickling filters?

The typical biochemical oxygen demand (BOD) removal efficiency for trickling filters is often cited as being within the range of 80-95 percent. This high efficiency is a result of the design and biological processes that take place within a trickling filter system.

Trickling filters utilize the growth of microorganisms on a medium to treat wastewater, where the biofilm formed by these microorganisms effectively breaks down organic matter present in the wastewater. This breakdown process significantly reduces BOD levels, which is a measure of the organic pollutant concentration in water.

The design, which includes rotating media and a continuous flow of wastewater, allows for optimal aeration and microbial activity, thereby enhancing the treatment efficiency. As a result, trickling filters can achieve these high BOD removal rates, making them an effective technology for secondary wastewater treatment in both municipal and industrial applications.