Quick, indicative sizing for STP, ETP, cooling towers and RO — the numbers we use for a first conversation, before the detailed design. Free to use.
Assumptions: 135 LPCD residential, 500 L/room hotel, 500 L/bed hospital, 45 L/person office; inlet BOD 250 mg/L; MBBR 6 h HRT, MBR 8 h; 1.3 kg O₂/kg BOD; 1.6 kg O₂/kWh; footprint 1.1 m²/KLD (MBBR), 0.6 (MBR). Why these technologies.
Selects stages from inlet strength, BOD/COD ratio, oil & grease and goal. Power and area are order-of-magnitude. ETP process description.
Evaporation ≈ 0.00153 × Q × ΔT; drift 0.01 %; blowdown = E/(C−1) − D. Water saving is shown against a 3-cycle baseline. Cooling tower treatment.
Permeate TDS from log-mean feed concentration × (1 − rejection). Actual values need membrane projection software and temperature correction. RO systems.
Send the same inputs plus a lab report and site details — we reply with a firm scheme, layout and budget range within one working day.