公开(公告)号：US20200023317A1

公开(公告)日：2020-01-23

申请号：US16498201

申请日：2018-03-29

Applicant: BL TECHNOLOGIES, INC.

Inventor： Jianwen ZHAI ,  Min LUO

IPC: B01D61/02 ,  B01D61/08 ,  C02F1/44

Abstract: This specification describes a method for lowering the content of monovalent ions in a final concentrate of a nanofiltration system relative to a brine and a corresponding nanofiltration system. The nanofiltration system comprises at least three stages of nanofiltration, wherein the concentrate from each segment flows into the next segment. A feed stream is sent into one stage to generate a concentrate stream, and a first portion of the concentrate stream is recirculated to the one stage. The pH of the feed stream is controlled in a range of 2-7. The temperature of the feed stream is in a range of 20-60° C. The feed stream includes the recirculated concentrate stream and at least part of a concentrate generated from an upstream stage. The method and the system described herein can reduce the concentration of monovalent ions in the final concentrate during a nanofiltration separation process.

公开(公告)号：US20240307823A1

公开(公告)日：2024-09-19

申请号：US18572638

申请日：2022-06-30

Applicant: BL TECHNOLOGIES, INC.

Inventor： Jianwen ZHAI ,  Xiaojun XU ,  Linglu YANG

IPC: B01D61/02 ,  B01D71/56

CPC classification number: B01D61/0271 ,  B01D61/029 ,  B01D71/56 ,  B01D2257/30 ,  B01D2311/2512 ,  B01D2325/20

Abstract: A multistage nanofiltration (NF) system for filtering a solute from a feed solution where a downstream NF stage is more permissive to the solute than an upstream NF stage. In some examples. the nanofiltration system includes a plurality of nanofiltration stages in series, where each nanofiltration stage is more permissive to the solute than the nanofiltration stage that is immediately upstream.

公开(公告)号：US20200039847A1

公开(公告)日：2020-02-06

申请号：US16653615

申请日：2019-10-15

Applicant: BL TECHNOLOGIES, INC.

Inventor： Jianwen ZHAI

IPC: C02F1/44 ,  B01D63/10 ,  B01D61/02 ,  B01D65/08 ,  B01D61/58 ,  B01D61/14

Abstract: A membrane filtration system with reverse osmosis (RO) or nanofiltration (NF) elements is adapted to provide high recovery from difficult wastewater. The system has a plurality of stages. The system is configured to provide concentrate staging. The last stage also has concentrate recirculation. The valves and pumps of the system are arranged such that the order of flow and a recirculation pump may be switched between the first stage and the last stage at some times.

公开(公告)号：US20200039846A1

公开(公告)日：2020-02-06

申请号：US16653614

申请日：2019-10-15

Applicant: BL TECHNOLOGIES, INC.

Inventor： Jianwen ZHAI

IPC: C02F1/44 ,  B01D63/10 ,  B01D61/02 ,  B01D65/08 ,  B01D61/58 ,  B01D61/14

Abstract: A membrane filtration system with reverse osmosis (RO) or nanofiltration (NF) elements is adapted to provide high recovery from difficult wastewater. The system has a plurality of stages. The system is configured to provide concentrate staging. The last stage also has concentrate recirculation. The valves and pumps of the system are arranged such that the order of flow and a recirculation pump may be switched between the first stage and the last stage at some times.