MBRs allow water reuse of sewage treatment
Subdivisions continue to multiply in Calgary. Developers routinely contact us for proposals for communities that are ‘outside the water treatment grid’ and are sourcing water and wastewater treatment systems. Water is a scarce resource in these communities and they are keen to reuse water wherever possible.
With a membrane bioreactor communities are able to both treat sewage and recover bacteria and pathogen free water for their fire stations, as well as irrigation. This can mean big environmental and promotional benefits for developers, not to mention cost savings!
At BI Pure Water we would like to see communities using MBR because it can be a completely closed loop system. Dewatered sludge can be spread on fields, recovering nitrogen and phosphorus, or mixed into compost. The MBR requires a little more skilled maintenance than a MBBR or SBR system because it requires – two or three times a year typically – a chemical clean of membranes. Also the membranes need to be monitored for breaks or fouling, though these symptoms would be monitored through the computer control system.
A budgetary price proposed for this typical subdivision is under $200,000 for the first 100 dwellings. MBR is modular so in Phase II and III of the development another MBR would be added later to defer capital costs.
MBRs are built and tested complete inside a container or steel framed building. This can save on construction costs and are hassle-free by being built and tested in the factory and shipped complete and ready for implementation in the community. The plants are by nature steel frame structures that are resistant to extreme weather events, as well as mold, wildlife and rodents.
The many uses of ultrafiltration
Particulate and pathogen free water
- Superb filtrate quality
- Removal of suspended solids (turbidity) & micro-organisms
- Partial removal of TOC, COD & BOD
- Fully automated operation – operator friendly
- Save $ and time wasted on cartridge filters
- Only Chlorine required for membrane cleaning
- low energy requirement
Reliable Potable Water Supply
By removing essentially all colloidal particles 0.01 to 1.0 micron, UF will remedy community water supply prone to turbidity, especially during spring runoff. The UF membrane also provides 4-log removal of viruses, cycts and bacteria. The filter is low maintenance and needs to be replaced an average of every six years.
Waste water reclamation
UF has proven useful for pre-treatment before RO, extending the life of a Reverse Osmosis unit and removing virtually all larger particles from a waste stream. Process wastewater can be recycled or reclaimed, saving money on wastewater disposal.
Post Sewage Treatment
A ceramic UF unit can be added to a traditional sludge facility to meet increased regulations for filtrate release. Membranes are long lasting and can be gravity fed, so very inexpensive to operate.
Particulate removal from water is conducted by UF membranes on industrial sites such as Mosaic Potash mine in Saskatchewan, TransAlta, AB coal power sites and Toba Inlet hydro power. The low maintenance filters enable process or source water to meet Canadian drinking water standards.