Twelve-Month Demonstration of GE ZeeLung* Technology Shows Potential to Intensify Nutrient Removal and Reduce Energy Consumption in Chicago
OREANDA-NEWS. September 27, 2016. GE (NYSE: GE) today announced the results of a year-long demonstration of GE’s ZeeLung* Membrane Aerated Biofilm Reactor (ZeeLung MABR) technology by the Metropolitan Water Reclamation District of Greater Chicago (MWRD). The demonstration proved the potential of the technology to upgrade the O'Brien Water Reclamation Plant in Skokie, Illinois, to intensify nutrient removal and enable enhanced biological phosphorous removal in existing tank volumes without the need to build new infrastructure; improve the performance for total suspended solids and ammonia removal during cold temperatures; and reduce energy demand of its aeration system by about 30 percent over the current mode of operation.
The MWRD partnered with GE to demonstrate ZeeLung in its pursuit of energy neutrality and to meet more stringent phosphorus regulations. The goal, over the year-long demonstration period, was to evaluate ZeeLung’s ability to intensify nutrient removal compared to conventional activated sludge and reduce energy consumption for aeration. This would expand the capacity of the existing aeration tanks to allow enhanced biological phosphorous removal (EBPR) without additional infrastructure. The MWRD also assessed ZeeLung's ability to improve total suspended solids and ammonia removal, which are both benefits of the system’s ability to increase biomass inventory without increasing mixed liquor suspended solids concentration.
"GE’s new ZeeLung MABR offers an innovative way for us to meet future regulations for nutrient removal within the plant’s existing footprint. In addition, the decreased energy needed to treat the water helps us move toward our goal of becoming energy neutral by 2023,” said Thomas Kunetz, assistant director of engineering, Metropolitan Water Reclamation District of Greater Chicago.
The demonstration results, supported by process modeling, show that the 30 percent energy demand reduction would be achieved if about one-third of the facility’s reactors were converted into anoxic zones where MABR membranes are immersed to provide supplemental nitrification capacity in the existing reactor volume. This intensification of nutrient removal would free up sufficient tank volume to accommodate an anaerobic zone for EBPR without the need to build a new battery of tanks.
“We believe that the future of wastewater treatment is energy neutrality,” said Heiner Markhoff, president and CEO—water and distributed power for GE Power. “With the potential to reduce energy demand as well as intensify nutrient removal, ZeeLung MABR can help wastewater treatment facilities move from significant energy users toward becoming energy neutral facilities. GE is proud to develop technologies, such as ZeeLung MABR, to advance the wastewater treatment industry."
Results from the demonstration will be used by the MWRD for projecting the performance and installation costs of a full-scale configuration and for comparison against other phosphorus removal options.
The technical results will be part of a paper presented at WEFTEC 2016 titled “Demonstration of Innovative MABR Low-Energy Nutrient Removal Technology at Chicago MWRD.”
First launched at WEFTEC 2015, ZeeLung is a gas-transfer membrane that transfers oxygen by diffusion to a biofilm that grows on the outside surface of the membrane. The microorganisms in the biofilm remove nutrients and organics in the wastewater by metabolizing them in the presence of oxygen. The result is four times greater efficiency than conventional fine bubble aeration.
For the MWRD demonstration, a full-scale MABR cassette in a side-stream configuration was installed at the O'Brien Water Reclamation Plant and tested from June 2015 to June 2016. Installation and startup was accomplished in a simple manner through immersion in the plant mixed liquor for biofilm inoculation. The biofilm was fully established in four weeks and provided treatment representative of steady-state conditions. The nominal capacity of the pilot equipment was 1.9 million liters per day (0.5 million gallons per day). The study was complemented with a process modeling exercise to optimize the operational parameters.
About the Metropolitan Water Reclamation District of Greater Chicago
Established in 1889, the MWRD (www.mwrd.org) is an award-winning, special purpose government agency responsible for wastewater treatment and stormwater management in Cook County, Illinois.
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