GEA BIOdek® trickling filter media: polypropylene makes the difference

Plastic trickling filter media are effectively used in biological wastewater technology because they provide a large surface for biofilm. This biofilm consists of active microorganisms that break down organic pollution present in wastewater (e.g., BOD, N, etc.). The trickling filter process itself is a simple but efficient technology: wastewater is evenly distributed onto a large media stack through which it trickles. The biofilm then cleans the water.

However, optimal trickling filter design and operation are essential for effective treatment success.

Requirements for fill media are manifold. First, they should provide a large surface for the biofilm to grow. In addition, sufficient air circulation is necessary to provide the required oxygen. The biofilm should also demonstrate appropriate thickness, and the water should flow through slowly and evenly. The resulting total configuration makes up a balanced three-phase system in which water, air, and biosolids share the void space within the fill media. Such systems represent a challenge for the design engineer. With BIOdek® fills, GEA Heat Exchangers provides a selection of media types to effectively accommodate many of these process requirements, any type of flow pattern, and a variety of channel sizes to optimize each trickling filter application.

There are other requirements in addition to those involving the process itself. .....

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