Comparison of the Biofilm and Activated Sludge Unit Processes

Biofilm techniques are generally used in small sewage works, serving populations of less than 20 000. They tend to be higher in capital costs but lower in running costs than activated sludge plants.

Biofilms oxidize generally more nitrogen than activated sludge per unit of bed volume, but the final effluent carries more suspended solids. Activated sludge processes usually require more skilled operators and more frequent maintenance than biofilms, and activated sludge processes are often difficult to apply, particularly in small communities.

To further treatment or to stream

Raw waste water

Raw waste water

To further treatment or to stream

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