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MBR (Membrane Bioreactor) Design

An MBR replaces the secondary clarifier with membranes. Set the flow, the high MLSS, HRT and design flux — get the bioreactor volume, permeate flow, required membrane area and module count, and the transmembrane pressure / permeability that decide cleaning frequency.

1Duty & membrane

MBR runs high MLSS (8–12 g/L) at short HRT; flux 15–30 LMH; recovery 90–98 %.

Avg flow Q^[1] (1k–200k)m³/d

Membrane^[2]

MLSS^[1] (8–14)g/L

HRT^[1] (3–8)h

Flux J^[3] (12–30)LMH

Recovery^[1] (90–98)%

TMP_design^[3] (0.2–0.6)bar

Temp T^[3] (15–34)°C

Results — reactor & membrane

Bioreactor V

—m³

Membrane area

—m²

Modules

—ea

Item	Value	Basis

2Permeability & cleaning

Permeability K = J / TMP drops as fouling builds — that is what CEB and the cleaning interval manage.

Parameter	Value	Note

Order note

Quote the MBR instruments at factory price

An MBR is the most instrument-dense unit on the plant: TMP per rack, permeability trend, DO, MLSS, permeate turbidity and level. We supply them at the manufacturer's ex-works price — margin from the export rebate only.

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Sources & parameter basis

[1]	Metcalf & Eddy / Judd MBR — MLSS 8–12 g/L, HRT 3–8 h, recovery 90–98 %, SRT 20–60 d.
[2]	Module area: hollow-fibre ~30 m²/mod, flat-sheet ~15–25 m²/mod (vendor catalogues).
[3]	Design flux 15–30 LMH; TMP 0.2–0.6 bar; permeability K = J/TMP (LMH/bar); tropical viscosity lifts flux ~2 %/°C.

Full derivation and worked example: MBR-Calculation-Sheet.md. An MBR is the clarifier-replacing biological variant — size it, then carry the sludge into the thickening tool.

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