Submerged beds

This technology is used as a wastewater treatment plant for rural areas for small agglomerations up to a thousand inhabitants. It is a highly effective solution. Compared to a conventional activated sludge (e.g. SBR system), submerged beds offer stability due to the adherence of a certain amount of biomass to the submerged media. In addition to the microorganisms inhabiting the submerged media packages, a certain amount of floating activated sludge is generated, which is an advantage over trickling filter beds (for example the Bioclere® system).However this process requires a greater degree of supervision. The operator handling the submerged bed should be proficient in both the processes related to the handling of activated sludge and biological biofilters.

The biological process is preceded by the removal of fat and suspended solids in the primary settling tank. The main wastewater treatment in wastewater treatment plants equipped with submerged beds takes place in a biological reactor, which is divided into a system of flow chambers. The chambers contain packages aerated from the bottom through a system of fine-bubble diffusers connected to the blower. The process takes place with the aid of aerobic bacteria that settle both on the media of the bed and as flocs in the sewage flow. By feeding on organic compounds, bacteria cleanse wastewater. The last phase is clarification - separation of the treated effluent from biological sludge, this is usually carried out in a secondary sedimentation tank.