Ovivo Water introduces a new range of deployable membrane bioreactor (MBR) wastewater treatment systems for use in industrial, hospitality, sports and leisure environments.
Designed compactly for accommodation in a standard 20-foot shipping container, the small footprint allows simple transport of the unit between sites.
The MBR wastewater treatment systems find application in mining sites, construction sites, hotels and resorts, boat marinas, sports and leisure venues, caravan parks as well as sewer mining and black water treatment.
John Koumoukelis, Sales & Marketing Director for Ovivo Australia, formerly AJM/Eimco Water Technologies says that an MBR system achieves full treatment within a single process stage that is capable of running at significantly higher MLSS (mixed liquor suspended solids) concentrations compared to traditional extended aeration processes.
The Ovivo membrane bioreactor system facilitates separation of solids and liquids to produce a high quality, fully disinfected effluent. The effluent can be utilised for non-potable re-use applications, reducing potable water demand on the site and cutting operating costs.
The new MBR wastewater treatment systems use a flat sheet membrane system to produce an effluent that is suitable for discharge to the most sensitive receiving waters.
The process employs simple flat sheet membrane panels housed in stainless steel cases and aerated by a coarse bubble diffuser system. A series of these membranes is submerged within an activated sludge treatment tank.
An advantage of this design is that the membrane panels are securely retained and cannot touch or abrade each other, while the cases also act as a flume to ensure effective tank mixing and even distribution of the biomass.
The membrane panels are manufactured with a pore size of 0.08 microns; in operation they are covered by a dynamic layer of protein and cellular material to further enhance the performance effectiveness of the filtration process by providing an effective pore size of less than 0.01 microns.
The raw sewage generally only requires screening and de-gritting prior to entering the membrane bioreactor tank. The process requires no primary or secondary settlement stages or additional tertiary treatment to achieve quality typically better than 5:5:5 mg/L BOD: Suspended Solids: Ammonia.
Key benefits of MBR wastewater treatment systems:
- Does not remove solids by settlement, therefore the biomass can operate at very high levels of MLSS, generally in the order of 12,000mg/l
- High concentration enables a low tank volume and a long sludge age to be utilised, which reduces sludge production and allows a small footprint
The maximum hydraulic flow determines the required number of membrane units. Treated effluent is removed from the membrane units using rotary lobe pumps.