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Membrane Bioreactor – New Technology Comes To Colorado!
The membrane bioreactor (MBR System) combines the activated sludge treatment process with the solids separation properties of membrane technology. The MBR system provides treatment through primary settling and biological process. The MBR system is designed to remove BOD, TSS, nitrogen, and Fecal Coliform.
The membrane is submerged in the mixed liquor (mixture of wastewater and organisms formed by the conversion of organics in the wastewater into solids) and provides a barrier that retains microorganisms, allowing them to remain in the treatment process for long periods of time. The membrane module consists of flat sheet membranes arranged in a cartridge. A high mixed liquor suspended solids concentration in the aeration zone provides biological treatment.
The final effluent or permeate is pulled out by an external pump through the MBR membranes leaving behind large organic and inorganic particles for further digestion or wasting. The solids that are sloughed by aeration and membrane cleaning are retained in the aeration compartment. The treatment zone must be periodically pumped to reduce the solids. Effluent must pass through the membrane to be discharged from the unit. The aeration system runs when the permeate pump is activated by a float system. The off time provides a resting period for the MBR unit. The rest periods allow the membranes to relax which helps in membrane filtration capability.
The aeration system provides scouring for the membranes and oxygen to the biological process. When the permeate pump is not running the aeration system runs on a timer that activates the blower based on a pre‐determined time. When the aeration operates the solid are broken up by turbulence. All pumps, timers and aeration equipment shall be controlled at the control panel. If Total Nitrogen removal is needed an additional recirculation pump would be added to the mixed liquor treatment zone that would be controlled to return the amount of nitrified waste to either an anoxic area or the settling area for denitrification. Why a Membrane BioReactor?
- Meets the most stringent State Regulatory requirements
- Effluent quality of BOD <2 mg/L, TSS <2, Ammonia <1
- Effective at removing harmful pathogens from wastewater
- Reduces Fecal Coliform & E. Coli: <10 CFU (colony forming units)
Designing residential systems in the Colorado Mountains poses challenges – including poor soils, wild terrain and blasting to create drainfields – for All Services Septic.
Venturing down holes to evaluate a rock’s ability to support building foundations wasn’t as appealing to geologist Tim Petz as communicating with people in the onsite wastewater world. When given an opportunity to help solve their problems, he chose a hands-on career with immediate gratification over writing construction reports.
In 2004, Petz opened All Service Septic in Arvada, Colo. It specializes in designing residential onsite systems and construction management, but has no employees. “I subcontract all my labor,” says Petz, 43. “When money is available, they get paid. When work slows down, they go skiing.” The policy enabled the company to survive comfortably during the economic slowdown a few years ago.
The Rocky Mountains, diverse geology, severe winters and most of the state’s 5 million people using onsite systems create unique challenges. The Front Range, or Denver Mountains, is a 415-square-mile area of rock, steep slopes and glaciers. The Western Slope, or Aspen area, has alpine meadows, canyons, plateaus and high desert.
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