Patents by Inventor Oliver Schraa

Oliver Schraa 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).

  • Ammonia-based aeration control with SRT Control
    Patent number: 10399876
    Abstract: Total ammonia nitrogen in a volume of sludge in an aeration tank is measured and compared to a target ammonia nitrogen setpoint to calculate an airflow target for adjusting the measured total ammonia nitrogen toward the target ammonia nitrogen setpoint. The airflow target may be an airflow rate or, for an SBR, an airflow duration, and airflow into the aeration tank is adjusted according to the airflow target. A target solids retention time setpoint is also calculated from information relating to the airflow target and the solids retention time is adjusted toward the target solids retention time setpoint. The waste activated sludge flow rate for the aeration tank may be adjusted to adjust the solids retention time for the aeration tank toward the target solids retention time setpoint.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: September 3, 2019
    Assignee: inCTRL Solutions Inc.
    Inventors: Oliver Schraa, Leiv Rieger
  • Ammonia-Based Aeration Control With SRT Control
    Publication number: 20180354828
    Abstract: Total ammonia nitrogen in a volume of sludge in an aeration tank is measured and compared to a target ammonia nitrogen setpoint to calculate an airflow target for adjusting the measured total ammonia nitrogen toward the target ammonia nitrogen setpoint. The airflow target may be an airflow rate or, for an SBR, an airflow duration, and airflow into the aeration tank is adjusted according to the airflow target. A target solids retention time setpoint is also calculated from information relating to the airflow target and the solids retention time is adjusted toward the target solids retention time setpoint. The waste activated sludge flow rate for the aeration tank may be adjusted to adjust the solids retention time for the aeration tank toward the target solids retention time setpoint.
    Type: Application
    Filed: September 22, 2017
    Publication date: December 13, 2018
    Inventors: Oliver Schraa, Leiv Rieger