MEMBRANE FILTER BIO - REACTOR

Crossflow Membrane Bio Reactor -MBR

The expenses for the disposal of industrial and municipal wastewater are increasing strongly due to more stringent governmental legislation ordering lower discharge limits and higher discharge taxes. Moreover, the intake of ground water is being limited to prevent a dehydration of the soil having a destructive influence on nature's flora and fauna. The call for a closed water cycle is becoming louder and more efficient wastewater treatment techniques have been developed, such as the membrane bio-reactor (MBR).

System description

An Membrane Bio Reactor (MBR) is a compact-built purification system combining the biological degradation step with a membrane separation step. The influent is fed to the aerated bio-reactor where the organic components are oxidisedby the activated sludge. Next, the aqueous activated sludge solution passes through a membrane filtration unit separating the water from the sludge. The latter returns to the bio-reactor, while the permeate is discharged or re-used as particle-free effluent.

The combination of biological treatment with membrane filtrationoffers several significant advantages over a
conventional activated sludge system as presently being used forindustrial wastewater, such as less surplus sludge and particle free-effluent.

A smaller surplus sludge results in a higher average age of the activated sludge leading to more component-specific bacteria and not only to fast-growing bacteria. Therefore, a Membrane Bio Reactor is very suitable to treat more heavily polluted industrial waste streams. The particle-free effluent is suitable for direct reuse or can be upgraded further by means of reverse osmosis for high-grade application as process water.

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