Biosep™ Membrane Bioreactor

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Biosep™ is a membranes bioreactor developed by Veolia. It is an activated sludge process in which membranes provide the clarification.

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Veolia

Dammam, Saudi Arabia

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Effective, Compact, Easy to Use
An innovative solution developed by Veolia Water Technologies, Biosep™ combines two proven technologies:

Biological treatment using activated sludge
Membrane filtration

Biosep™ produces very high quality water, fully compliant with the highest standards for water reuse for irrigation and industrial applications.
With more than 120 references worldwide, Biosep™ is recommended for:

Significant reduction of carbon, nitrogen and phosphorus pollution
High and simultaneous removal of bacteria depending on the treated water, completed by downstream disinfection.
Biosep™ is sold under the Neosep™ trademark in Japan, the United States, Australia and New Zealand.

Biosep™ for Industries
The Biosep™ technology meets the specific requirements of industrial clients, when they are confronted with the following problems:

Concentrated effluents
High discharge standards and treatment efficiency
Upgrade/refurbish existing facilities
Water reuse
Limited space available

Biosep™ for Municipalities
Biosep™ is suitable for municipal clients who:

Must adhere to high discharge standards (environmentally sensitive areas)
Want to achieve high wastewater treatment efficiency
Have a limited area to operate in
Want to reuse water for irrigation, for use in sprinkler systems or for recharging aquifers

Biosep™ is ideal for meeting the requirements of municipal clients who experience sharp seasonal load variations (touristic areas). Biosep™ also enables the purified water to be released directly back into environmentally sensitive areas, thereby avoiding the construction of long outfalls.
Operating Principle
Biosep™ uses a biological tank and a membrane system which can be presented in different configurations depending on the application and local conditions. In the immersed version (the most common), these modules are directly immersed in the biological tank or in a separate tank.

After pre-treatment (e.g. screening sand removal), raw water flows into the biological tank where carbon, nitrogen and phosphorus pollutants are removed.
Membrane filtration then separates the water from the activated sludge: the treated water is drawn off using a low-pressure (< 0.6 bar) pump. The sludge retained by the membrane creates a sludge cake on the outside membrane surface. The excess sludge is directly removed from the biological tank for dewatering.
Sustainable membrane filtration performance is key to the process; this is based on different automated functions which provide for membrane washing and backwashing: backwash, air injection and chemical cleaning (usually bleach and citric acid). This is Veolia knowledge and expertise.

An Optimized and Simplified Treatment Line
By replacing the conventional gravitational clarification stage, membrane separation goes away with the limitations surrounding sludge settling: discharge quality is completely controlled.
A physical barrier at the core of the system
The choice of the filtration membranes (organic flat sheet or hollow fiber membranes) is an important factor.
The main selection criteria are:

Sustainable mechanical characteristics (integrity maintained over time)
Sustainable hydraulic performances
Hydraulic flow recovery after a peak
Related operational costs controlled

Veolia has no partnership established with a particular membrane supplier, which allows us to choose and provide the most suitable membrane, depending on technological evolution and feedback from operational sites. Veolia has more than 120 references, both municipal and industrial, with more than a dozen membrane suppliers.
Performances
High quality treated water
The water quality obtained by Biosep™ is fully compliant with stringent environmental standards and meets municipal and industrial requirements too.
Biosep™ achieves high removal of carbon and nitrogen pollution and retains almost all of the suspended matter, with performance unmatched until today. It remains stable whatever the load variations. Disinfection of the treated water is provided by the integrated membrane filtration step. Additional disinfection may be necessary depending on the guarantees required.

Applications
Thanks to its tried and tested design, Biosep™ offers a highly compact water treatment solution, enabling the treatment to be carried out with high concentrations of biomass (8 to 12 g SS/l). Biosep™ is a solution suitable for compact installations.

Biosep™ achieves high-performance treatment of industrial effluents for the following markets:

Food and beverage
Pharmaceuticals
Cosmetics
Chemicals
Petrochemicals
Biofuels
Landfill leachate
Pulp and paper
Automotive
Textiles…

Advantages of the Biosep™ Process for Municipal Clients:

Membranes provide clarification; the load applied can be significantly higher than in a classic activated sludge. For the same load, the reactor is smaller so, the plant is more compact
Thanks to its compactness, the structure can be easily confined, and odor and noise nuisances are controlled
On mixed wastewater, Biosep™ is free of risks related to fibrous sludge bulking
By undergoing an additional UV treatment, the water treated by Biosep™ can be reused in irrigation, sprinkler systems or for recharging aquifers
Biosep™ is ideal when refurbishing existing sites, thanks to its compact design and the fact that it can be easily installed in existing tanks

Biosep™ has many advantages compared with conventional biological treatment of effluents by activated sludge:

Compact system
No final clarification (no risk of sludge loss, performance is independent of the sludge index)
With a similar load, the biological reactor is smaller
High COD removal, including slowly biodegradable COD thanks to a high "sludge age" and membrane separation
Reduced reagent consumption in phosphorus elimination
Thickener may also be removed because of the high concentration reached in the biological reactor

Features & Benefits
Biosep™ provides water of exceptional quality: