What percentage of BOD is typically removed by a trickling filter?

A trickling filter is a type of biological treatment used in wastewater management, primarily for the removal of organic matter as measured by Biological Oxygen Demand (BOD). The typical removal efficiency of BOD in a trickling filter is generally around 60%.

This percentage represents the ability of the trickling filter to biologically degrade and remove organic pollutants present in wastewater as it flows over a bed of media (such as rocks or plastic) that supports the growth of microorganisms. As wastewater trickles down through the filter, these microorganisms consume the organic material, effectively reducing the BOD levels in the effluent.

The efficiency of BOD removal can be influenced by factors such as the design of the filter, the type of media used, the flow rate of wastewater, and the specific biological populations that develop within the filter. While the removal percentages for lower or higher efficiency might be stated in various contexts, 60% is a standard benchmark for optimal conditions in a trickling filter setup.