公开(公告)号：US20230194522A1

公开(公告)日：2023-06-22

申请号：US18083656

申请日：2022-12-19

Applicant: HACH COMPANY

Inventor： Dan KROLL

IPC: G01N33/569 ,  G01N33/543 ,  G01N15/14 ,  G01N15/06

CPC classification number: G01N33/56911 ,  G01N33/54326 ,  G01N15/1404 ,  G01N15/06 ,  G01N2015/149 ,  G01N2015/1493 ,  G01N2015/0693 ,  G01N2015/1006

Abstract: Methods and kits are provided for analyzing a fluid with a flow cytometer to determine the concentration of a target component in the fluid. At least two bead groups are combined with the fluid, wherein each of the bead groups includes surface-functionalized beads that have a different size from the other bead groups. The target component can bind to the functional groups on the beads, and the beads with the targets can be counted with the flow cytometer. Based on the numbers of beads with targets in each group, a most probable number (MPN) of the target component can be determined.

公开(公告)号：US20180292348A1

公开(公告)日：2018-10-11

申请号：US15766806

申请日：2016-10-07

Applicant: HACH COMPANY

Inventor： Corey SALZER ,  Vishnu RAJASEKHARAN ,  Dan KROLL ,  John LEE

IPC: G01N27/404 ,  G01N27/49 ,  G01N33/18 ,  G01N27/407

Abstract: An embodiment provides an amperometric sensor, including: a housing containing an inner fill solution; an electrode bathed in the inner fill solution; and a membrane in intimate contact with the electrode; the electrode being formed as a non-compact or porous structure on the membrane; whereby a spatial relationship of the electrode and the membrane is constant. Other embodiments are described and claimed.

公开(公告)号：US20230202889A1

公开(公告)日：2023-06-29

申请号：US18087375

申请日：2022-12-22

Applicant: HACH COMPANY

Inventor： Vishnu RAJASEKHARAN ,  Dan KROLL ,  Matthew GRAY

IPC: C02F3/00 ,  C02F3/30

CPC classification number: C02F3/006 ,  C02F3/30 ,  C02F2209/34

Abstract: Methods and systems for controlling nitrous oxide production in a wastewater treatment facility in which wastewater is treated with microbes in a biological reactor. Nitrous oxide production can be controlled by determining an amount of two or more nutrients in the biological reactor, calculating a value that represents a comparison of the values, comparing the calculated value to a threshold value, and optionally taking a corrective action to reduce nitrous oxide production based on the comparison. In one aspect, nitrous oxide production can be controlled by determining an amount of ammonium in the biological reactor, determining an amount of a nitrogen compound that can include nitrite, nitrate, and/or hydroxylamine, calculating a value that compares the amount of ammonium to the amount of the nitrogen compound, and taking a corrective action that changes a system parameter to reduce the nitrous oxide production if the calculated value surpasses a threshold limit.