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Membrane bioreactor modules
MBR Membranes for Membrane Bioreactors
MBR membranes are submerged flat-sheet or hollow-fibre modules that replace the secondary clarifier in a biological treatment plant, separating biomass from treated water directly. They produce a consistently low-solids effluent that suits reverse osmosis recycle, and typically filter at 0.04 to 0.4 micrometres.
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Answer first
What MBR Membranes Are, and How They Are Specified
MBR membranes are submerged flat-sheet or hollow-fibre modules that replace the secondary clarifier in a biological treatment plant, separating biomass from treated water directly. They produce a consistently low-solids effluent that suits reverse osmosis recycle, and typically filter at 0.04 to 0.4 micrometres.
An MBR removes the weakest link in conventional biological treatment. A secondary clarifier relies on sludge settling well, which varies with loading, temperature and sludge age. A membrane barrier does not care whether the sludge settles, so effluent quality stays consistent through conditions that would upset a clarifier.
The consequence downstream is what makes MBR attractive for recycle: RO fed from an MBR sees a far steadier and cleaner feed than RO fed from a clarifier, which shows up directly in cleaning frequency and element life.
Specification
MBR module specification
| Parameter | Typical value or range | Notes |
|---|---|---|
| Pore size | 0.04–0.4 µm | Microfiltration to ultrafiltration range |
| Module format | Submerged flat sheet or hollow fibre | Flat sheet is more tolerant of coarse debris |
| Operation | Submerged, suction-driven | Low transmembrane pressure |
| MLSS tolerance | Typically 8,000–12,000 mg/L | Higher than a clarifier can handle |
| Air scour | Continuous or cyclic | Controls cake build-up on the membrane surface |
| Replaces | Secondary clarifier | Footprint is substantially smaller |
| Effluent quality | Consistently low turbidity and solids | Suits RO recycle directly |
| Cleaning | Maintenance and recovery clean cycles | Chemical regime set by the fouling observed |
Pore size
- Typical value or range
- 0.04–0.4 µm
- Notes
- Microfiltration to ultrafiltration range
Module format
- Typical value or range
- Submerged flat sheet or hollow fibre
- Notes
- Flat sheet is more tolerant of coarse debris
Operation
- Typical value or range
- Submerged, suction-driven
- Notes
- Low transmembrane pressure
MLSS tolerance
- Typical value or range
- Typically 8,000–12,000 mg/L
- Notes
- Higher than a clarifier can handle
Air scour
- Typical value or range
- Continuous or cyclic
- Notes
- Controls cake build-up on the membrane surface
Replaces
- Typical value or range
- Secondary clarifier
- Notes
- Footprint is substantially smaller
Effluent quality
- Typical value or range
- Consistently low turbidity and solids
- Notes
- Suits RO recycle directly
Cleaning
- Typical value or range
- Maintenance and recovery clean cycles
- Notes
- Chemical regime set by the fouling observed
Typical ranges across the module class. Final values follow the datasheet of the module quoted.
Selection guidance
Screen ahead of the membranes, harder than feels necessary
The most common cause of MBR module damage is not fouling, it is debris. Hair, fibre and rag entering the tank wrap around hollow fibres and abrade flat sheets, and once inside the tank they are extremely difficult to remove.
Fine screening ahead of the bioreactor, typically finer than a conventional plant would use, is the cheapest insurance available in this design. Where the influent carries textile fibre or significant hair load, flat sheet is generally the more forgiving format.
Application mapping
Where MBR Membranes Are Used
STP with water recycle
- Typical requirement
- Consistent effluent for RO recycle
- Indicated configuration
- MBR replacing the clarifier, then cartridge filtration and fouling-resistant RO
ETP in textile and chemical plants
- Typical requirement
- High and variable organic load
- Indicated configuration
- MBR with air scour and a cleaning regime set from observed fouling
Constrained-footprint retrofit
- Typical requirement
- Higher capacity in existing tankage
- Indicated configuration
- MBR operating at elevated MLSS to raise treatment capacity per volume
Commercial terms
How This Category Is Quoted
Water treatment does not have a list price, and any supplier quoting one before seeing a feed analysis is quoting a different plant from the one you need.
Pricing basis
On request, and capacity-dependent. Plant pricing moves with capacity, feed water analysis and the recovery target; membranes, cartridges and resins are quoted per element, per lot or per litre of media.
Order quantity
From a single replacement element or a case of cartridges through to full plant scope. Consumable lines are quoted per box or per lot, and the lot size is stated on the quotation.
Lead time
Confirmed per line item at quotation stage. Stocked consumable lines and made-to-order plant differ substantially, so a single blanket lead time for the category would be misleading — the quotation carries the figure for each line.
Invoicing
GST invoice against company or institutional purchase order. Proforma issued where advance payment or internal approval requires it.
Delivery coverage
Despatch from Delhi NCR across India, including plant, project and institutional sites. Delivery city and site access are asked for at enquiry because both affect despatch mode.
Documentation
Technical datasheet for the item quoted, and a test certificate where the principal supplies one with that product. Tender and institutional documentation formats are prepared on request — send the format with the enquiry so the quotation is issued in a form you can submit without rework.
Request for quotation
Request a Quote — MBR Membranes
Fields marked with an asterisk are required. The technical fields are what usually decide whether you get a quotation on the first pass or three emails of clarification.
Frequently asked
MBR Membranes — Common Questions
What is the advantage of an MBR over a conventional clarifier?
Consistency and footprint. A membrane barrier separates biomass regardless of how well the sludge settles, so effluent quality holds through loading and temperature changes that would upset a clarifier.
It also allows operation at higher MLSS, typically 8,000 to 12,000 mg/L, which means more treatment capacity in the same tank volume.
Should I choose flat sheet or hollow fibre MBR membranes?
Flat sheet is more tolerant of coarse debris and generally easier to clean manually. Hollow fibre offers more membrane area per unit volume and a smaller footprint.
Where the influent carries hair, rag or textile fibre, flat sheet is usually the more forgiving choice regardless of the area advantage.
Can MBR effluent feed an RO plant directly?
It is the normal arrangement for recycle, with cartridge filtration between the two. MBR permeate is consistently low in solids, which is exactly what an RO element needs.
Use fouling-resistant elements on the RO regardless, because the dissolved organic load in treated effluent remains higher than on a borewell or municipal feed.
Related Products and Categories
Specified alongside mbr membranes, and the category this page sits in.
Fouling resistant RO membranes for the recycle stageUF membranes as an alternative barrierSTP and ETP solutionsBack to Membrane Filtration
- Delhi NCR base with pan-India supply, including plant and project sites.