The Aqua-Aerobic® MBR Membrane Bioreactor is a unique time-managed, sequential aeration process promoting biological nutrient removal in a simplified unit process. The integration of PURON™ submerged membranes, provides direct filtration of high-level MLSS.
FEATURES
Unique PURON™ submerged membrane filtration
Time-Managed, complete mix activated sludge
True batch or continuous fill operation modes
Inherent flow equalization in biological process
Predictive membrane-flux control
Automated sludge recycle optimization
On-line proportional-demand oxygen control system
Independent mixing and aeration for unlimited power control
ADVANTAGES
Increase existing plant capacities
Superior process reliability
Flexible retrofit options with minimized civil costs
Rapid solution for increasing process capacity
Augmented disinfection capabilities
Pathogen reduction via removal of Cryptosporidium and Giardia
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Fill Mode
The Aqua Aerobic® MBR system is designed to receive raw, screened influent to the biological reactor system on a continuous basis. To attain optimal process performance, usually two or more biological reactors are employed, with only one reactor receiving influent at any given moment. In a typical two basin MBR system, one reactor will operate in a “fill” mode, while the other reactor is allowed to ‘draw’. The unique hydraulic design of the Aqua Aerobic® MBR system features in-basin equalization to benefit process performance and reduce the hydraulic impact on the membrane sizing.
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Fill and Draw Mode
Throughout the fill and draw sequence, each biological reactor processes through a completely mixed, time managed sequence of controlled aeration to achieve carbonaceous removal, and reductions in nitrogen and phosphorus. Because these process requirements are met within each biological reactor, the need for separate anoxic tanks, anaerobic selectors and recycle pumps is eliminated. By operating with mixed liquor suspended solids (MLSS) concentrations of 8,000 to 10,000 mg/l, the Aqua Aerobic® MBR system offers the smallest footprint among activated sludge technologies.
From the biological reactors, the MLSS is pumped to separate membrane tanks for complete solids/liquid separation to sub-micron levels. Filtration is accomplished by effluent permeate pumps that draw suction on the submerged membranes. The excess sludge is returned by gravity to the proper biological reactor, which exists in a ‘draw’ stage. By providing at least two membrane tanks, the filtration system can provide continuous permeate production while allowing for automatic cleaning operations to maintain low trans-membrane pressures.
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By using a single header construction and rugged hollow-fiber design, the PURON™ membrane modules are ideally suited for long term operation in elevated MLSS applications. With a nominal pore size of 0.05µ, the positive membrane barrier offered by the Aqua Aerobic® MBR process assures the highest quality performance.
