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Emerging Technologies Solids Removal prepared 2012 March 2013 Technology Summary Compressible Media Filtration (CMF) (continued) The passively operated matrix of the FlexFilter cells works with simple flow and level logic controls, open-close valves, and a low-head blower for cleaning and pumping the spent backwash water to waste. The multifunction filter makes this technology very attractive for satisfying current and future regulatory mandates for phosphorous control, excess wet-weather treatment and as an intermediate wastewater treatment step to reduce overall plant energy consumption and/or increase plant organic treatment capacity. A trial in Atlanta (McKern, 2004), showed that the FlexFilter is suitable for removal of TSS from raw CSO flow (75% to 94%) and sedimentation basin effluent (35%). The Bio-FlexFilter is suitable for meeting secondary treatment effluent criteria for CBOD5 and TSS (effluent less than 30 mg/L each) for wet-weather flows (WWETCO 2012). Sizing of the filter matrix is a function of hydraulic and solids loading and the available head. Peak hydraulic loading rates (HLRs) range from 10 to 20 gpm/sq ft, with the lower end for high-strength wastewaters like CSOs and primary influent sewage. The higher HLR would apply to the more dilute solids concentrations such as from a tertiary filter or dilute wet weather. Chemically assisted phosphorous removal HLR is 5 to 10 gpm/sq ft, depending on the concentration of metal salt/soluble phosphorous precipitate required. For CSO or primary influent applications, the footprint of the concrete filter structure (10 MGD) including influent/effluent channels and operating and backwashing cell chambers would be less than 210 sq ft per MGD (WWETCO, 2012). A smaller footprint would be used for SSO or tertiary applications. The filter system footprint above 10 MGD decreases with increasing flows. Also according to the manufacturer, the filter matrix footprint without the peripheral concrete channels and chambers can be reduced by about one-third using influent and effluent piping. The depth of the typical high solids filter is about 14 feet. Steel tank tertiary filters are 10 feet tall. Existing filter basins at 6- and 7-foot depths can be retrofitted. Comparison to Established Technologies: According to Frank and Smith (2006) the WWETCO FlexFilter technology provided comparable effluent TSS (49 mg/L to 52 mg/L) with the ballasted flocculation systems in side-by-side testing. However, ballasted flocculation requires flocculation chemicals and ramp-up time (15 to 30 minutes) to achieve performance objectives. The WWETCO FlexFilter can meet similar or better TSS removals, requires no chemicals, and immediately achieves performance objectives. The FlexFilter starts dry and ends dry without odor issues, without special startup protocols, and without special attention to mechanical equipment. Although the WWETCO filter footprint is generally somewhat larger than the footprint for ballasted sedimentation, it is roughly half as deep. FlexFilter throughput for tertiary filtration is in the order of 98 percent (WWETCO, 2012). Average throughput for CSO is about 95 percent (< 5% backwash per McKern, 2004). The throughput for chemically assisted phosphorous filtration and biofiltration is in the order of 85 to 90 percent (WWETCO, 2012). Available Cost Information: Approximate Capital Cost: Equipment includes the filter media bed (all internal structural metals, media, compression bladder, air diffuser), complete controls, valves/gates and actuators and blower package with redundancy. Equipment costs vary with the scale of the facility. Smaller flows will result in greater redundancy because of the minimum size of the equipment. Costs decrease with increasing flows above 10 MGD. Equipment costs for the 10-MGD filter matrix can be generalized as follows: Application Estimated equipment cost ($ per gallon capacity) Tertiary filter SSO and primary effluent CSO and influent Less than $0.06 Less than $0.07 Less than $0.09 Approximate O&M Costs: Operation costs are summarized as follows (WWETCO, 2012): 1. Tertiary filtration – 10 kW per MGD treated (20 mg/L TSS influent) 2. SSO or primary effluent - 35 kW per MGD treated (100 mg/L TSS influent) 3. CSO or primary influent - 60 kW per MGD treated (200 mg/L TSS influent) 2-12 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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