Membrane Bioreactor Biological Process Calculators

Estimate a solids-balanced bioreactor volume, calculated HRT, membrane area, peak flow, and preliminary process indicators.

Screen net design flux, module area, membrane trains, N+1 availability, air-scour hand-off, and flux-regulated train dispatch.

Aggregate biological aeration, membrane air scour, pumping, chemicals, membrane replacement, sludge, labour, and fixed costs into annual energy and direct-OPEX screens.

Calculate full-duty and time-weighted membrane air demand from active train area, SAD_m, scour sequencing, altitude, and inlet-air conditions.

Screen pipe velocity, Hazen–Williams friction, fitting loss, total dynamic head, preliminary pump power, motor margin, and annual pumping energy.

Screen cumulative balancing storage, equalized discharge flow, peak-flow attenuation, transfer-pump power, and annual transfer energy from a transparent daily flow pattern.

Screen sequential membrane-cleaning solution make-up, commercial product dose, annual chemical demand, cleaning water, and direct chemical cost.

Calculate biological solids inventory, SRT, wasting-rate targets, and the effect of effluent solids losses using a transparent mass balance.

Extend excess solids into dewatering feed, cake mass and volume, liquor return, polymer demand, operating duty, annual cake, and preliminary storage.

Size validated UV-reactor duty and chlorination product demand, T10, CT, and preliminary contact-basin volume for MBR permeate.

Check temperature-corrected nitrifier growth, theoretical and safety-adjusted minimum SRT, selected-SRT margin, ammonia loading, oxygen, and alkalinity.

Size supplementary liquid-carbon demand, product feed, storage, post-anoxic hydraulics, and alkalinity recovery for nitrate polishing.

Estimate ammonia nitrification, nitrate denitrification, oxygen and alkalinity effects, carbon demand, and preliminary anoxic-zone volume.

Estimate total-phosphorus removal and preliminary ferric chloride or alum product dose after selected biological phosphorus removal.

Screen aerobic and anoxic volumes, biological oxygen demand, field oxygen-transfer efficiency, peak airflow, and thermodynamic isentropic blower power.

Estimate alkalinity demand and residual alkalinity associated with biological nitrification, and calculate supplemental chemical dosing.

Estimate internal mixed-liquor recycle, nitrate-N removal load, and preliminary anoxic-zone volume for MLE and pre-denitrification MBR systems.

Estimate permeate BOD from soluble and particulate BOD fractions, biological-removal assumptions, and membrane retention of residual particulates.

Estimate steady-state MLVSS and MLSS concentration from removed BOD, SRT, HRT, biomass yield, endogenous decay, and solids fraction assumptions.