Nitrate is a worldwide contaminant that causes environmental (eutrophication) and human health (methemoglobinemia, cancers) concerns. Very few techniques are available to eliminate it from natural environment and they suffer from major drawbacks, such as production of unwanted byproducts (toxins or brine). This project develops a new approach that could overcome these disadvantages and demonstrates the feasibility of using an enzyme and a mediator to transfer the electrons from different types of electrode to nitrate. The main advantage of this system is the production of a gaseous...