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Emerging Technologies Solids Removal prepared 2012 March 2013 Technology Summary Compressible Media Filtration (CMF) Objective: State of Development: Multifunction, passive, high-rate filtration for wet- Innovative. and dry-weather treatment applications. Description: The WWETCO FlexFilterTM and Bio-FlexFilterTM use a synthetic fiber media bed that is passively compressed from the sides by the head of the incoming water. The lateral compression forms a cone-shaped porosity gradient that allows the stratification and removal of large and small particles from the top to the bottom of the media bed. The porosity gradient through the media bed, with its ability to handle heavy solids loading, gives the technology a wide range of uses. In one location at the WWTF, the filter can be used to 1. Produce a reuse quality effluent as a tertiary filter 2. Increase the organic removal capacity of the facility, and/or reduce its power consumption 3. Treat excess wet-weather flow including biological treatment, as appropriate The first two functions are accomplished during dry weather by a portion of the filter matrix sized for their specific dual-use (Figure 1). During dry weather, part of the filter matrix acts as a tertiary filter and the remaining portion as a biofilter. The tertiary filter cells can effectively remove phosphate precipitates created by addition of metal salts. The biotreatment portion of the filter matrix can be used during dry weather to treat primary influent or primary effluent wastewater, removing both particulates and soluble BOD reducing secondary loadings (one trial showed consistent 38 percent removal, [WWETCO, 2012]) while maintaining a healthy biological population in the filter media bed for treatment of the wet-weather flow when it occurs. The biofilter cell matrix is sized for the excess wet-weather flow and TSS conditions to generally meet secondary treatment effluent criteria. In wet weather, valves are opened or closed to direct the excess flow through a one or two-stage filter treatment train. A two-stage, wet-weather filter train is shown in Figure 2. In this case the FlexFilter primarily provides solids separation and the Bio-FlexFilter provides soluble BOD removal, optimizing the capacity of each train component. Another operation option allows the FlexFilter or a portion of it to be used in the tertiary filter mode during smaller, wet-weather events. Only during larger events would the entire filter matrix be dedicated to wet-weather treatment. When biological treatment is not required, for instance in the case of CSOs, the Bio-FlexFilter cells can be eliminated. In this case, the FlexFilter would still be applied in the same two modes shown in Figures 1 and 2 (the Bio-FlexFilter being excluded), with both filter effluents going to disinfection. A filter cell treating wet weather or primary type solids uses the neighboring filter effluent for backwash supply. When treating a waste with low solids (primary or secondary effluent), the filter cell can use the influent water as backwash supply. Low head air scrubs the media and lifts the spent backwash into the backwash trough to waste. Backwash from the filter would normally be routed to the plant influent, backwash from the biofilter would normally be sent to solids processing. Excess biological growth is controlled with a dilute chlorine (3 mg/L) solution added to the backwash. 2-10 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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