Preliminary dissolved air flotation design calculations based on your wastewater flow, solids loading, temperature, and application type. Includes salinity compensation and saturator sizing.
Preliminary design calculations based on your wastewater characteristics
Linear interpolation from standard APHA/AWWA tables (5°Cā40°C) gives baseline dissolved air at 1 atm. Salinity and pressure corrections applied.
COD, FOG, and TSS inputs drive realistic A/S ratios and removal expectations. Dairy and high-FOG streams get conservative hydraulic loadings.
Surface area converts to actual footprint (rectangular or circular). Depth derives from target HRT, freeboard, and sludge collection zone.
A/S ratio determines recycle flow: QR = (A/S Ć Q Ć TSS) / Ca. Solids loading rate verifies the design against industry limits.
Full engineering methodology with equations, example calculations, saturator design, and sludge handling.
Read GuideCompare coagulant costs and optimise chemical consumption with our interactive calculator.
Open CalculatorValidate contact zone hydrodynamics and white water distribution with computational fluid dynamics.
Discover MoreValidate calculator estimates with real wastewater at 1ā5% of design flow.
Book NowThe DAF sizing calculator works from six inputs. Understanding their sensitivity helps interpret results.
Average and peak forward flow in m³/h. Peaking factor 1.5–2.5 for industrial diurnal cycles; 1.2–1.5 for steady-state continuous processes.
Influent TSS concentration in mg/L. Drives solids load. If unknown, use 200–500 mg/L for municipal-style, 500–3,000 for industrial-organic, 200–800 for petrochem.
0.005–0.06. Use 0.01–0.02 default; 0.025–0.04 for oily; 0.005–0.01 for sludge thickening. Higher A/S → higher recycle → larger pump/saturator.
Default 5 bar. Higher pressure reduces recycle ratio (smaller pump) but raises pressure-vessel cost. Validation: optimise against fleet experience.
Surface area output. 4–6 m/h for industrial; 6–10 m/h for municipal; 8–12 m/h for algal/WT. Manipulating HLR explores compact vs conservative designs.
Packed: 75–85%; cyclonic: 90–95%. Higher efficiency reduces recycle ratio. Calculator output is sensitive to this ā use field-verified value from manufacturer.
Our engineers validate calculator estimates with jar testing, pilot trials, and CFD analysis. Reynolds & Bauhm provides contractual effluent guarantees backed by 30+ years of DAF experience.
Our expertise spans multiple industries with sector-specific water treatment solutions.