公开(公告)号：US20250115493A1

公开(公告)日：2025-04-10

申请号：US18377587

申请日：2023-10-06

Applicant: HACH COMPANY

Inventor： Vishnu RAJASEKHARAN ,  Matthew GRAY ,  Russell YOUNG

IPC: C02F1/00 ,  C02F1/68 ,  C02F101/10

Abstract: A method for controlling a hydrogen sulfide concentration of a wastewater stream, the method including measuring a hydrogen sulfide concentration in one phase of the wastewater stream. At least one additional parameter of the wastewater stream is measured, and a hydrogen sulfide concentration of the other phase of the wastewater stream is calculated with a mathematical model that characterizes the hydrogen sulfide concentration in the other phase based on a set of variables that includes the measured hydrogen sulfide concentration in the one phase and the measured at least one additional parameter. Based on the calculated hydrogen sulfide concentration of the other phase, a treatment dosage of a treatment agent that reduces the hydrogen sulfide concentration of the wastewater stream is determined and applied to the wastewater stream.

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.

公开(公告)号：US20230257283A1

公开(公告)日：2023-08-17

申请号：US17609592

申请日：2021-09-24

Applicant: HACH COMPANY

Inventor： Matthew GRAY

IPC: C02F1/00

CPC classification number: C02F1/008 ,  C02F2209/001 ,  C02F2209/02 ,  C02F2209/04 ,  C02F2209/055 ,  C02F2209/06 ,  C02F2209/11 ,  C02F2209/20 ,  C02F2209/40

Abstract: A method, system, and computer readable storage medium for determining an optimal amount of coagulant to be added to water for coagulation treatment. The method includes predicting a water quality index that would be achieved for a corresponding nominal coagulant dose by evaluating at least one coagulation-related incoming water parameter of water that has not been treated with coagulant, with a first mathematical model constructed from historical data including (i) previously administered coagulant dosages; and (ii) previously determined values of the water quality index of the water. The method also includes determining whether the predicted water quality index is within a target range. If the predicted quality index is not within the target range, then the coagulant dosage can be adjusted, and the adjusted dosage can be evaluated to predict the water quality index that would be achieved if the adjusted coagulant dosage is administered to the water.