Patents by Inventor Dora Sheau-Yun Chiang

Dora Sheau-Yun Chiang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • USE OF ELECTROCHEMICAL OXIDATION FOR TREATMENT OF PER- AND POLYFLUOROALKYL SUBSTANCES (PFAS) IN WASTE GENERATED FROM SORBENT AND RESIN REGENERATION PROCESSES
    Publication number: 20230212042
    Abstract: Perfluorinated and polyfluorinated compounds in an effluent stream are destroyed by means of electro-oxidation. Although electro-oxidation can be used to directly treat effluent, a more efficient use is to pre-concentrate applicable pollutants with filters or sorbents. Concentrated perfluorinated and polyfluorinated compounds are removed from the filter or sorbent with a regenerant solution and treated by electro-oxidation. A current density of 0.5 mA/cm2 or 1 mA/cm2 effectively reduces the level of perfluorinated contaminants within 1-3 hr. using a titanium electrode. This allows both the regenerant and filter or sorbent to be reused and greatly reduces the amount of material that must be treated as hazardous waste.
    Type: Application
    Filed: November 3, 2022
    Publication date: July 6, 2023
    Inventors: Dora Sheau-Yun Chiang, Rachael A. Casson, Shangtao Liang
  • Use of electrochemical oxidation for treatment of per-and polyfluoroalkyl substances (PFAS) in waste generated from sorbent and resin regeneration processes
    Patent number: 11512012
    Abstract: Perfluorinated and polyfluorinated compounds in an effluent stream are destroyed by means of electro-oxidation. Although electro-oxidation can be used to directly treat effluent, a more efficient use is to pre-concentrate applicable pollutants with filters or sorbents. Concentrated perfluorinated and polyfluorinated compounds are removed from the filter or sorbent with a regenerant solution and treated by electro-oxidation. A current density of 0.5 mA/cm2 or 1 mA/cm2 effectively reduces the level of perfluorinated contaminants within 1-3 hr. using a titanium electrode. This allows both the regenerant and filter or sorbent to be reused and greatly reduces the amount of material that must be treated as hazardous waste.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: November 29, 2022
    Assignee: AECOM
    Inventors: Dora Sheau-Yun Chiang, Rachael A. Casson, Shangtao Liang
  • USE OF ELECTROCHEMICAL OXIDATION FOR TREATMENT OF PER-AND POLYFLUOROALKYL SUBSTANCES (PFAS) IN WASTE GENERATED FROM SORBENT AND RESIN REGENERATION PROCESSES
    Publication number: 20190185352
    Abstract: Perfluorinated and polyfluorinated compounds in an effluent stream are destroyed by means of electro-oxidation. Although electro-oxidation can be used to directly treat effluent, a more efficient use is to pre-concentrate applicable pollutants with filters or sorbents. Concentrated perfluorinated and polyfluorinated compounds are removed from the filter or sorbent with a regenerant solution and treated by electro-oxidation. A current density of 0.5 mA/cm2 or 1 mA/cm2 effectively reduces the level of perfluorinated contaminants within 1-3 hr. using a titanium electrode. This allows both the regenerant and filter or sorbent to be reused and greatly reduces the amount of material that must be treated as hazardous waste.
    Type: Application
    Filed: September 12, 2017
    Publication date: June 20, 2019
    Inventor: Dora Sheau-Yun Chiang