Systems and methods of flexible electrochemical stripping to recover alkaline ammonia and acidic ammonium from wastewaters
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorsWilliam A. Tarpeh, Anna Kogler, Brandon D. Clark, Matthew Junjie Liu, William Chow
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Abstract
Most nitrogen recovery techniques recover acidic ammonium fertilizers, and few enable alkaline ammonia recovery. Many embodiments provide multi-chamber electrochemical stripping reactors to recover alkaline ammonia and acidic ammonium from wastewater. The reactor combines electrodialysis and membrane stripping. The acidic and alkaline product portfolio for wastewater-derived ammonia expand implementation opportunities for nitrogen recovery.
Claims20
An electrochemical stripping reactor for removing ammonia and ammonium and recovering acidic ammonium and alkaline ammonia comprising:
- at least two anode chambers and each chamber comprising at least one anode;
- at least two cathode chambers and each chamber comprising at least one cathode;
- at least one cation exchange membrane;
- and
- at least one gas permeable membrane;
- wherein the anode chambers and the cathode chambers are disposed in alternating arrangement, and the cation exchange membrane and the gas permeable membrane are disposed in alternating arrangement;
- wherein the cation exchange membrane is disposed between a first anode chamber and a first cathode chamber sequentially, and the gas permeable membrane is disposed between the first cathode chamber and a second anode chamber sequentially;
- wherein at least the second anode chamber recovers acidic ammonium;
- and
- wherein at least a second cathode chamber recovers alkaline ammonia.
Dependencies are inferred from the claim text.