Modular bioelectrochemical systems and methods
View Patent ↗Bioelectrochemical systems (BES) having configurations with spiral wound structures and with frame-and-plate structures are provided. Systems may allow for production of an electrical current that is at least partially generated by microorganisms connected directly or indirectly to an electrode. A spiral wound or frame-and-plate type bioelectrochemical system that may be used for energy or chemical production, and/or desalination may include an anolyte influent point, a catholyte influent point, electrodes, ion selective membranes, mesh separators, gas collection devices, an exterior containment vessel, and one or more external electrical devices.
1. A bioelectrochemical system (BES) reactor comprising: a centrally located tube;
a spirally wound reactor chamber comprising one or more sheets of anode electrode layer, one or more separator or membrane sheets, and one or more spacer sheets that are spirally wound around the centrally located tube; and
one or more cathode electrode layers comprising one or more of catholyte or diffuse as an electron acceptor, operatively coupled to the reactor chamber;
one or more deionization or desalination chambers located between a pair of carbon electrodes and between one or more the anode electrode layer and the cathode electrode layer containing salt electrolyte solution;
wherein anolyte enters the reactor from the centrally located tube and flows through reactor chamber, and is expelled out of the reactor, chemicals in the anolyte and catholyte react with the anode electrode and cathode electrode layers to produce a potential difference between the anode and the cathode, and wherein ions from the electrolyte are attracted and captured onto the carbon electrodes under the potential.
2. The BES reactor of claim 1 , wherein the anode electrode comprises natural or acclimated microorganisms or reactive enzymes that catalyze the electrochemical reactions and generate an electrical potential between the anode electrode and cathode electrode.
3. The BES reactor of claim 1 , wherein the anolyte enters the reactor from the centrally located tube through perforated holes contained inside the reactor chamber and exits the reactor after biochemical reactions.
4. The BES reactor of claim 1 , wherein the diffused gas comprises air or aqueous catholyte that enters the reactor chamber from other than the centrally located tube, and exits the reactor after reactions.
5. The BES reactor of claim 1 , wherein the spirally would reactor chamber comprises an anode electrode, a porous spacer, a separator or ion selective membrane, an electrolyte chamber, and a cathode.
6. The BES reactor of claim 1 , wherein the anolyte flows through the reactor chamber passively or actively.
7. The BES reactor of claim 1 , wherein the anolyte flows through the reactor chamber through a series of channels formed by one or more membranes or physical separators.
8. The BES reactor of claim 1 , wherein the cathode comprises an air-permeable cathode or chemical electrolyte cathode.
9. The BES reactor of claim 1 , wherein the spirally wound reactor chamber provides a surface area to volume ratio of at least 100 m 2 /m 3 , thereby providing a hither energy and chemical product output density relative to a non-spirally wound reactor chamber with lower surface to volume ratio.