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PuraM Submerged Membrane Bioreactor
The PuraM Membrane Bio-Reactor (MBR) system is the product of extensive research and development that is designed to achieve high quality effluent within a greatly reduced overall footprint. The PuraM membrane is engineered specifically for the community and commercial wastewater treatment market with an emphasis on reliability and ease of maintenance.
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The Membrane Bioreactor Process
The PuraM system uses flat plate ultra-filtration membranes to separate activated sludge from treated effluent eliminating the need for final clarification. It is the biological process that removes contaminants such as BOD, nitrogen and phosphorus while the membranes, submerged in the biological reactor, provide a physical barrier rejecting pathogens and other suspended solids. The membrane is an extremely effective solids separation device and facilitates greatly reduced reactor volumes due to the higher mixed liquor suspended solids values at which it operates, up to approximately 12,000 mg/l, compared with typical values for conventional activated sludge plants of up to 4,500 mg/l. The nature of the activated sludge floc combined with continuous air scouring by aeration bubbles at the membrane surface, using a carefully designed aeration grid, ensures consistently high removal efficiency without fouling of the membranes.
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Nutrient removal
Because of the long sludge retention times required by the membrane design nitrification will almost certainly occur assuming that sufficient oxygen and alkalinity are available and adequate pH levels and wastewater temperatures are maintained.
Denitrification requires an anoxic zone to treat the nitrified MLSS with carbon provided for the bacteria by the incoming wastewater where recirculation to the head of the works is provided or via a separate carbon source such as methanol or ethanol where a post anoxic tank is provided or insufficient carbon is present in the influent.
Hydraulic retention time in the anoxic basin is based on the influent nitrogen loading, the operating temperature, the available carbon to consume the oxygen in the recycled MLSS and the nitrogen removal performance requirements for the plant.
To remove phosphorus MBR systems can be designed for biological reduction or more commonly by the use of chemical addition for smaller plants. |
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The Highest Quality Effluent Performance
The high removal efficiency of the PuraM system results in exceptional final effluent quality. Complete retention of macro colloidal material is attainable within the PuraM reactor, including bacteria and some viruses, making PuraM effluents of a quality suitable for reuse, direct discharge to sensitive areas and in some cases removing the need for chlorination or U.V. systems. Depending on the standard of nutrient reduction required Bord na Móna can provide enhanced processes that can treat wastewater to the most stringent limits with Total Nitrogen levels below 5 mg/l.
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| Treatment Performance |
| Parameters |
Typical Values |
Achievable Values |
| BOD5 |
<5 mg/l |
Below detectable limits |
| TSS |
<2 mg/l |
Below detectable limits |
| Ammonia |
<1 mg/l |
Below detectable limits |
| Total Nitrogen |
<10 mg/l |
<5 mg/l |
| Phosphorus |
<1 mg/l |
<0.05 mg/l |
| Turbidity |
<0.1 NTU |
<0.05 NTU |
| Fecal Coliform |
<3 CFU / 100ml |
Non-detect |
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Suitable for reuse applications
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The PuraM Membrane Module
| PuraM is based on flat plate membrane technology
assembled into stainless steel membrane cassettes
containing either 25 or 50 plates. The cassette
consists of an integral air diffuser assembly that
creates crossflow conditions for scouring of the
membrane surface ensuring that effective biofilm
performance is maintained. As a result, the typical
time between routine cleans is approximately 12 months. PuraM does not require back-pulsing or
frequent chemical cleaning reducing the complexity
of the plant and operation & maintenance costs. |
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Pre-engineered Package Plants
PuraM is available in a range of prefabricated modules
with standard sizes capable of treating flows from 5,000
to 80,000 gpd or above with multiple reactors and is
available as a pre-engineered unit in either carbon steel,
stainless steel or GRP tank options or for installation
in concrete tanks. Systems can be located above
ground or in-ground whichever is most convenient.
A range of screening and pumping packages can be
specified depending upon individual circumstances.
Add-on packages for phosphorous and/or enhanced
nitrogen removal are also available. Service and
maintenance agreements are all part of our offering
ensuring you have total service support at all times.
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| PuraM Package Plants |
| Model |
Capacity (gpd) |
Approximate Reactor
Tank Size
Height x Width x Length |
| 0125 |
7,000 |
12’ x 5’ x 4’ |
| 0150 |
14,000 |
12’ x 9’ x 5’ |
| 0250 |
28,000 |
12’ x 9’ x 10’ 6” |
| 0350 |
42,000 |
12’ x 9’ x 15’ |
| 0450 |
56,000 |
12’ x 9’ x 20’ |
| 0550 |
70,000 |
12’ x 9’ x 25’ |
| 0650 |
84,000 |
12’ x 9’ x 30’ 6” |
Benefits of the PuraM system
Specifically designed for Community & Commercial Applications
| High Quality |
- High quality final effluent:
- BOD & TSS < 5 mg/l
- Ammonia < 1 mg/l
- Total Nitrogen to < 5 mg/l
- P removal to < 0.05 mg/l
- The PuraM membranes have been developed by and are manufactured in-house by Bordna Mona ensuring the process know-how is available to the customer without having to refer to a remote manufacturer
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| Cost Effective |
- Plate membranes are an economical solution for small to medium sized plants
- Up to 75% more compact than conventional systems
- Modular design enables phases construction
- The PuraM membranes have been developed by and are manufactured in-house by Bord na Mona eliminating the additional mark-up associated with many other membrane suppliers
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| Simplified Reliable System |
- Proven in operation over many years
- Robust and stable process
- Fully engineered solution backed by extensive process capability
- Available as gravity filtration – no requirement for permeate pumps
- Ease of operation & reduced maintenance
- Minimal peripheral equipment
- Less automation than comparable MBR systems
- No back-pulse cleaning
- No routine cleaning chemicals used
- Minimal inlet screening required
- Remote monitoring and service packages offered
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Community & Commercial
