Emerging Tech for Wastewater Treatment

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Emerging Tech for Wastewater Treatment ( emerging-tech-wastewater-treatment )

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March 2013 Emerging Technologies Electricity Generation prepared 2012 Technology Summary Microbial Fuel Cell (MFC) Based Treatment System Objective: State of Development: Use bacteria to generate electricity while providing Research. biological wastewater treatment. Description: An MFC is a device that generates electricity from bacterial metabolism of organic matter (which is measured as chemical oxygen demand in wastewater). During the final stage of bacterial metabolism, electrons are passed along the cell membrane and deposited onto a terminal electron acceptor, usually oxygen. Under anaerobic conditions, bacteria must use an alternative electron acceptor like sulfate, nitrate, or—as is the case with an MFC—an electrode. In an MFC, bacteria are grown under anaerobic conditions and they transfer their electrons externally to an anode. Electrons flow from the anode to a positively charged cathode through an external circuit; this flow of electrons represents an electrical current. The cathode is exposed to oxygen and protons (H+) that chemically react with the incoming electrons to form water. MFC research is focused on the design of the fuel cell including the number of chambers and their layout; electrode size (surface area), spacing, materials, and quantity; alternatives to and composition of proton exchange membranes; and affordable cathode catalysts. Biological research is being done to identify bacterial species that optimize the process and to better understand how they transfer electrons externally. A modified MFC that generates pure hydrogen gas for use with hydrogen fuel cells is also being studied. In this approach, no oxygen is supplied at the cathode. Instead, a small amount of voltage is added to the circuit to facilitate the chemical formation of hydrogen gas (instead of water). Recent advances in MFC research have achieved substantial increases in MFC power production compared to previous designs. While still an emerging technology that is being studied at the laboratory-level, some day MFCs might be capable of producing enough electricity to operate a wastewater treatment plant and perhaps even an excess that could be sold back to the grid. Comparison to Established Technologies: Not comparable to any established wastewater treatment technology. Available Cost Information: Approximate Capital Cost: Not disclosed by the vendor. Approximate O&M Costs: Not disclosed by the vendor. Vendor Name(s): Research projects at universities: Dr. Bruce Logan Pennsylvania State University Hydrogen Energy Center 231Q Sackett Building University Park, PA 16802 Telephone: 814-863-7908 Email: blogan@psu.edu Installation(s): No installations are in the United States. Wastewater Treatment and In-Plant Wet Weather Management 3-45

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