Integrated MBR design screen

MBR Energy & Operating Cost Calculator

Aggregate process aeration, membrane air scour, pumping, ancillary loads, chemical consumption, membrane replacement, sludge disposal, labour, maintenance, and fixed allowances into a transparent preliminary annual-energy and direct-OPEX screen.

Preliminary screen, not a vendor guarantee: use measured or supplier data whenever available. The membrane air-scour route uses time-weighted normal air from the Membrane Flux, Area & Train Sizing Calculator so the scour duty is not applied twice.

Project inputs All currency values use the selected local currency basis. No currency conversion is applied.

Operating basis and electricity

Average Permeate Flow

m³/day

Operating Days per Year

days/year

Electricity Tariff

currency/kWh

Currency Label

display label only

Process aeration and pumping

Process Aeration Electrical Power

kW; from Aeration & Basin Zoning Calculator or vendor data

Process Aeration Duty

percent of calendar operating time

Permeate Pump Flow

m³/h; set to zero if not applicable

Permeate Pump TDH

m liquid

Pump Overall Electrical-to-Liquid Efficiency

percent at the duty point

Ancillary Electrical Load

kW; controls, mixers, screening or other direct allowance

Membrane air-scour source control

Scour Energy Source

Automatic membrane train-sizing hand-offThe calculator reads the latest membrane sizing result from this browser session. Run the sizing calculator, then return here to refresh the linked train basis.

Duty trains—

Standby trains—

Installed trains—

Area per train—

Normal online area—

Standby area—

Installed area—

Active scour trains—

Scour online area—

Open train-sizing calculator

Site Elevation

m above sea level

Inlet-Air Temperature

°C

Scour Blower Pressure Rise

Overall Wire-to-Air Efficiency

percent; screening input

Chemicals and direct OPEX

Alkalinity Chemical Product Demand

kg/day of supplied product

Alkalinity Chemical Price

currency/kg product

Membrane Cleaning Chemical Cost

currency/year

Installed Membrane Area

—

m²; imported from membrane train sizing

Replacement Cost

currency/m²

Expected Replacement Interval

years

Sludge Disposal Cost

currency/year

Labour Cost

currency/year

Non-Membrane Maintenance

currency/year

Other Fixed OPEX

currency/year

Integrated result summary All results show the selected assumptions and calculation basis.

Membrane air-scour energy basis

When the derived source is selected, the time-weighted normal air flow from the membrane train-sizing calculator is converted to actual inlet flow at site elevation and temperature. The isentropic compression model then estimates average electrical scour-blower power. Because the imported air flow already includes membrane scour duty, annual energy uses the full calendar operating hours without multiplying the duty factor again.

Q_N,scour,avg = SAD_m × A_scour × f_scour

Q_actual = Q_normal × (T_actual/T_standard) × (P_standard/P_ambient)

P_electrical = {k/(k−1) × P_ambient × Q_actual × [(P₂/P₁)^(k−1)/k−1]} ÷ η_wire-to-air

Use a vendor or measured kW value when an equipment curve is available. The derived route is a preliminary thermodynamic screen, not final blower selection.

Source references

Aeration costs in MBRs [1] Calculating whole-life costs in MBRs [2]