System and method to control h2o2 level in advanced oxidation processes

A method of in-situ production and removal of H2O2, comprising:

• providing a bio-electrochemical system (BES) comprising an aqueous cathode compartment comprising a first cathode and a second cathode, and an aqueous anode compartment comprising an anode, which is at least partly covered in biofilm;
• wherein the first cathode is connected to a first circuit and the second cathode is connected to a second circuit, and wherein the two circuits are connected by an external switch;
• applying voltage from a microbial fuel cell (MFC) to the first cathode, which induces H2O2 production;
• and
• producing electricity over the external resistor with the second cathode, which induces H2O2 removal.

A method for treating a liquid or wastewater comprising:

• contacting a liquid or wastewater with a bio-electrochemical system (BES) comprising an aqueous cathode compartment comprising a first cathode and a second cathode, and an aqueous anode compartment comprising an anode, which is at least partly covered in biofilm;
• wherein the first cathode is connected to a first circuit and the second cathode is connected to a second circuit and, wherein the two circuits are connected by an external switch,
• applying voltage from a microbial fuel cell (MFC) to the first cathode, which induces H2O2 production;
• and
• producing electricity over the external resistor with the second cathode, which induces H2O2 removal from said liquid or waste water.