Hydrok/Microdyn-Nadir MBR

BIO-CEL® Membrane Bioreactor Process

Hydrok have the rights for the UK distribution of the Microdyn-Nadir BIO-CEL Membrane
Bio Reactors to add to the portfolio of Wastewater Treatment Processes.

The Membrane Bioreactor (MBR) Process

The MBR process is a combination of a classic activated sludge biological treatment system
operating at high mixed liquor solids levels coupled with membrane filtration. The membrane
filtration system, using the unique Microdyn-Nadir BIO-CEL modules removes the need for final
settlement tanks, as the ultrafiltration membrane acts as a barrier to the sludge and solid
particles, allowing mainly clean water to pass through. The result is a very compact system,
making it an ideal solution where space is limited. MBR’s are also capable of producing a very
high quality treatment, making them ideal for water reuse applications typically as low as:

• Biochemical Oxygen Demand (BOD) <5mg/l
• Total Suspended Solids (SS) <0.5mg/l
• Ammonia Nitrogen (NH3N) <0.5mg/l
• Faecal Coliforms <10 CFU/100ml

How do they work?

Hydrok/Microdyn-Nadir Membrane Bioreactors operate at far higher mixed liquor suspended solids (MLSS)
concentrations than conventional activated sludge systems, typically between 8,000 to 10,000 mg/l.
The elevated biomass concentration provides very effective removal of both soluble and particulate
biodegradable materials at higher loading rates. The resulting increased sludge retention times ensures
complete nitrification even in extremely cold weather.

The BIO-CEL Modules are immersed in the aeration tank, and are in direct contact with the mixed liquor.
A vacuum is applied to the modules by means of a permeate pump, which allows the treated water to pass
through the membranes, and then onto a final effluent discharge point.