ATV-DVWK-A 281 - Trickling Filters (9/2001)

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Standard ATV-DVWK A 281E - Dimensioning of Trickling Filters and Rotating Biological Contactors - September 2001

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The biological stage of wastewater treatment plants, employing trickling filters and rotating biological contactors without sludge return feed, is dealt with in this Standard. The standard applies only for rotating biological contactors without artificial aeration for the supply of the biofilm with the required oxygen. The development of the trickling filter process and the rotating biological contactor as well as the factors on their treatment efficiency are covered in advanced literature. As with all aerobic processes for biological wastewater treatment, the contact between biomass and wastewater is to be established and the biomass is to be supplied with oxygen. With the trickling filter process the wastewater is spray irrigated over the filter material so that, during the dripping process, the contact between biomass and wastewater is established. In general, aeration is without application of further energy. With rotating biological contactors the partially submerged filter material is rotated about its longitudinal axis with the application of energy. During the emergent phase of the material the biofilm can take up oxygen from the surrounding air and in the submerged phase the pollutants from the wastewater.

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