公开(公告)号：US12194417B2

公开(公告)日：2025-01-14

申请号：US17719363

申请日：2022-04-12

Applicant: Evoqua Water Technologies LLC

Inventor： Li-Shiang Liang ,  Michael J. Shaw ,  Wenxin Du

IPC: B01D61/44 ,  B01D61/46 ,  C02F1/469

Abstract: A method of operating an electrochemical device includes periodically discharging a volume of concentrate reject in a timed batch cycle and replacing the concentrate reject with feed water. An electrochemical water treatment system includes a recycle line having a valve controlled by a control module. The control module periodically opens the valve to discharge concentrate reject from the recycle line in a batch timed cycle. The recycle line is fed with feed water to replace the discharged concentrate reject.

公开(公告)号：US20240336507A1

公开(公告)日：2024-10-10

申请号：US18560118

申请日：2022-05-26

Applicant: Evoqua Water Technologies LLC

Inventor： Simon P Dukes ,  Joshua Griffis ,  Li-Shiang Liang ,  Harshita Gogoi ,  Wenxin Du ,  Thomas K Mallmann

IPC: C02F9/00 ,  B01D61/02 ,  B01D61/14 ,  B01D61/16 ,  B01D61/58 ,  C02F1/00 ,  C02F1/44 ,  C02F1/52 ,  C02F1/66 ,  C02F5/00 ,  C02F101/14 ,  C02F103/34

CPC classification number: C02F9/00 ,  B01D61/16 ,  B01D61/58 ,  B01D61/026 ,  B01D61/027 ,  B01D61/029 ,  B01D61/145 ,  B01D2311/04 ,  B01D2311/08 ,  B01D2317/025 ,  B01D2317/08 ,  C02F1/004 ,  C02F1/441 ,  C02F1/442 ,  C02F1/444 ,  C02F1/5236 ,  C02F1/66 ,  C02F5/00 ,  C02F2101/14 ,  C02F2103/34 ,  C02F2301/08

Abstract: A system for the treatment of phosphate-containing wastewater comprises a pretreatment subsystem including a mixing chamber configured to mix a potassium-based salt with the wastewater to precipitate K2SiF6 from the wastewater, a solids-liquid separator to separate the precipitated K2SiF6 from the wastewater and form a pretreated wastewater, and a mixing chamber to dilute the pretreated wastewater with raw wastewater, and a filtration subsystem including a first filtration configured to receive the pretreated wastewater and remove particles to form a first effluent, a second filtration unit remove divalent ions from the first effluent and form a second effluent, and a third filtration unit configured to remove additional dissolved solids from the second effluent and form a third effluent suitable for discharge to the environment.

公开(公告)号：US20220259085A1

公开(公告)日：2022-08-18

申请号：US17275286

申请日：2019-08-21

Applicant: Evoqua Water Technologies LLC

Inventor： Hao Dang ,  Wenxin Du ,  George Y. Gu ,  Michael J. Shaw ,  Simon P. Dukes

IPC: C02F9/00

Abstract: Methods for treating phosphogypsum-containing water are disclosed. The water may be treated so as to promote precipitation of one or more target constituents and to facilitate downstream membrane treatment. A coagulant may be added to promote phosphate recovery. Related systems are also disclosed.

公开(公告)号：US11298660B2

公开(公告)日：2022-04-12

申请号：US16098591

申请日：2017-05-04

Applicant: Evoqua Water Technologies, LLC

Inventor： Li-Shiang Liang ,  Michael J. Shaw ,  Wenxin Du

IPC: B01D61/44 ,  C02F1/469

Abstract: A method of operating an electrochemical device includes periodically discharging a volume of concentrate reject in a timed batch cycle and replacing the concentrate reject with feed water. An electrochemical water treatment system includes a recycle line having a valve controlled by a control module. The control module periodically opens the valve to discharge concentrate reject from the recycle line in a batch timed cycle. The recycle line is fed with feed water to replace the discharged concentrate reject.

公开(公告)号：US20230145108A1

公开(公告)日：2023-05-11

申请号：US17276352

申请日：2019-08-21

Applicant: EVOQUA WATER TECHNOLOGIES LLC

Inventor： Wenxin Du ,  Hao Dang ,  George Y. Gu ,  Michael J. Shaw ,  Simon P. Dukes ,  Justin Wayne Higgs

IPC: C02F9/00 ,  C02F1/44 ,  C02F1/20

CPC classification number: C02F9/00 ,  C02F1/444 ,  C02F1/441 ,  C02F1/20 ,  C02F2101/16

Abstract: Methods for treating phosphogypsum-containing water are disclosed. The water may be treated so as to promote precipitation of one or more target constituents and to facilitate downstream membrane treatment. A coagulant may be added to promote phosphate recovery. Ammonia may optionally be removed. Related systems are also disclosed.

公开(公告)号：US20220234004A1

公开(公告)日：2022-07-28

申请号：US17719363

申请日：2022-04-12

Applicant: Evoqua Water Technologies LLC

Inventor： Li-Shiang Liang ,  Michael J. Shaw ,  Wenxin Du

IPC: B01D61/44 ,  C02F1/469

Abstract: A method of operating an electrochemical device includes periodically discharging a volume of concentrate reject in a timed batch cycle and replacing the concentrate reject with feed water. An electrochemical water treatment system includes a recycle line having a valve controlled by a control module. The control module periodically opens the valve to discharge concentrate reject from the recycle line in a batch timed cycle. The recycle line is fed with feed water to replace the discharged concentrate reject.

公开(公告)号：US20220073393A1

公开(公告)日：2022-03-10

申请号：US17276369

申请日：2019-08-21

Applicant: Evoqua Water Technologies LLC

Inventor： Hao Dang ,  Wenxin Du ,  George Y. Gu ,  Michael J. Shaw

IPC: C02F9/00 ,  B01D61/52

Abstract: Methods for processing pretreated phosphogypsum wastewater are disclosed. The pretreated wastewater may be subjected to electrodialysis involving at least one monovalent cation selective membrane. Further downstream membrane treatment may be applied. Upstream precipitation and air-stripping techniques may optionally also be employed. Related systems are also disclosed.