Specific energy consumption (SEC) is the electrical energy used per cubic meter of permeate produced, in kWh/m³. Modern SWRO with energy recovery achieves 2.5–4 kWh/m³; without ERD, 6–8 kWh/m³. BWRO achieves 0.5–1.5 kWh/m³. SEC = (total motor input kW) ÷ (permeate flow m³/h). For an RFP, total includes HP pump, booster, ERD circulation pump, and pretreatment auxiliaries. Quoted SEC must specify which auxiliaries are included. SEC is the single most important operating metric for any desalination plant. It drives water cost, carbon footprint, and economic viability versus alternative supplies. The thermodynamic minimum at 50% recovery on 35,000 ppm seawater is ~1.06 kWh/m³. Real-world plants achieve 2.5–3.5 kWh/m³ — 2.5–3.5× the theoretical floor. SEC drops as recovery rises (less feed pump duty per m³ permeate) up to ~45%; above that, osmotic backpressure raises SEC again. A modern containerized SWRO with PX achieves 3.0–3.5 kWh/m³ at design point. ForeverPure has supplied desalination, high-pressure pumps, and energy-recovery devices to commercial and industrial customers since 2003. Contact our engineers for sizing, quotes, or technical support.Specific Energy Consumption (kWh/m³) (SEC)
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