Dynameau offer two advanced aerobic processes with small foot-prints.
1) Fixed Film aerobic process called a Fixed Bed Bioreactor (FBBR) which is based on SAF (Submerged Aerated Filter) technology
2) Membrane Bioreactor (MBR) using mostly flat sheet membranes.
Fixed Bed Bioreactor Technology (FBBR)
FBBR (Fixed Bed Bioreactor) Biological Waste Water Treatment Brochure Ver 3
Biological water treatment using a Fixed Bed Bioreator FBBR. The biological oxidation of the organics in the water water take place in a submerged and fixed bed biozone comprising a pvc support matrix of 150 - 240 m2/m3 specific volume to provide a stable platform for an attached biomass concentration of up to 9000 mg/l.
The high biomass concentration is largely fixed to the support matrix ensuring the biomass in solution is of low concentration and will not overload the downstream settlement clarifier.
The FBBR process is highly efficient in terms of biological oxidation of organic matter as well as low energy consumption and low sludge production.
The process is extremely biologically stable and can accept long periods of under load, shock loads and periodic overloads.
The FBBR can be used for polishing discharge water with elevated ammonia levels.
Typical treated water standard is a fully nitrified discharge of 15:15 (BOD:Solids mg/l) and better with tertiary treatment meting 10mg/l BOD and 10 mg/l solids.
Typically, the FBBR is ‘containerised’ and standardised plant. Fully packaged including inlet screen and grit removal, biozone, clarification and tertiary treatment using pressure sand filtration. This type of FBBR plant is standardised to populations of 100, 250, 500 and 1000 persons. Multiple FBBR plants can be run in parallel lanes to increase capacity.
This FBBR plant in all of its sizes is available as a plug and play package for delivery globally.
The FBBR plant is a fixed-bed bioreactor using “Attached Growth” technology by means of a submerged, aerated, high surface area media.
The ‘heart’ of the system is a structured matrix of welded and rigid polypropylene media with a very high specific surface area. This allows for high concentrations of attached biomass to be maintained in the Biozone.
The unique flow patterns within the media ensure high rates of biological oxidation with relatively low retention time. The media ensures air bubble retention is prolonged and allows for exceptionally high oxygen transfer rates with low energy consumption.
There are few moving parts within the plant allowing for low maintenance and low operator demands. The FBBR is well proven over decades, with reliable, robust and trouble free operation.
Due to the gentle but fully mixed environment within the Biozone, the biomass is allowed to grow to a long sludge age before being “sloughed” from the media. This produces excellent effluent with good nitrification, partial de-nitrification and low levels of waste sludge production.
FBBR plants are either pre fabricated steel, package containerised or use insitu concrete tanks for larger plants. Existing treatment plants can be upgraded for capacity and effluent quality by adopting FBBR technology.
Membrane Bioreactor Technology (MBR)
MBR (Membrane Bioreactor) Biological Waste Water Treatment Brochure Ver 1
The Membrane Bioreactor MBR is a development of the well known activated sludge process. Remarkably, the MBR dispenses with the need for both primary and final Settlement Tanks. Further, the foot print of the plant is significantly reduced whilst the final effluent quality is improved far beyond that of a conventional WWTP with tertiary treatment.
The limiting factor in a conventional activated sludge plant is the performance of the final settlement tanks. If the biomass concentration in the aeration tank is allowed to rise too high, typically above 3500 mg/l, then the settlement tank will fail, allowing solids to pass out of the plant with the effluent, this degrading it.
In the MBR plant, membranes in the micro/ultra filtration range are used to separate the biomass from the treated water. This allows the biomass concentration in the aeration tank to be raised significantly, reaching 15,000 mg/l whilst retaining an F/M ratio of 0.1 - 0.15. Therefore, the biological treatment volume can therefore be reduced five or six fold. This significant reduction in volume plus the elimination of the settlement tanks makes the MBR very compact.
Sludge Dewatering
Brochure Packaged Sludge Dewatering Ver 1
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