Patents by Inventor Minjia ZHAO

Minjia ZHAO 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).

  • Membrane treatment of ammonia-containing waste water
    Patent number: 10752533
    Abstract: A method for treating waste water containing ammonia comprising the steps of: i) passing the waste water as a feed solution through a first RO membrane (24) to produce a first permeate stream (30) and a first reject stream (32), ii) adjusting the pH of the first reject stream (32) to >9, iii) passing the first reject stream (32) through a second RO membrane (26) to produce a second permeate stream (36) containing ammonia and a second reject stream (38), and iv) passing at least a portion of the second permeate stream (36) to a cooling tower (12) to evaporate at least a portion of the ammonia.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: August 25, 2020
    Assignee: DDP SPECIALTY ELECTRONIC MATERIALS US, INC.
    Inventors: Cheng Yang, Hong Su, Minjia Zhao, Hugh Zhu
  • MEMBRANE TREATMENT OF AMMONIA-CONTAINING WASTE WATER
    Publication number: 20180257965
    Abstract: A method for treating waste water containing ammonia comprising the steps of: i) passing the waste water as a feed solution through a first RO membrane (24) to produce a first permeate stream (30) and a first reject stream (32), ii) adjusting the pH of the first reject stream (32) to >9, iii) passing the first reject stream (32) through a second RO membrane (26) to produce a second permeate stream (36) containing ammonia and a second reject stream (38), and iv) passing at least a portion of the second permeate stream (36) to a cooling tower (12) to evaporate at least a portion of the ammonia.
    Type: Application
    Filed: October 30, 2015
    Publication date: September 13, 2018
    Inventors: Cheng YANG, Hong SU, Minjia ZHAO, Hugh ZHU