The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 08, 2021
Filed:
Oct. 15, 2019
Applicant:
Bl Technologies, Inc., Minnetonka, MN (US);
Inventor:
Jianwen Zhai, Beijing, CN;
Assignee:
BL TECHNOLOGIES, INC., Minnetonka, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 61/02 (2006.01); B01D 61/14 (2006.01); B01D 65/08 (2006.01); C02F 1/44 (2006.01); B01D 61/58 (2006.01); B01D 63/10 (2006.01);
U.S. Cl.
CPC ...
C02F 1/44 (2013.01); B01D 61/022 (2013.01); B01D 61/142 (2013.01); B01D 61/58 (2013.01); B01D 63/10 (2013.01); B01D 65/08 (2013.01); C02F 1/441 (2013.01); C02F 1/442 (2013.01); B01D 61/025 (2013.01); B01D 61/145 (2013.01); B01D 2311/08 (2013.01); B01D 2311/25 (2013.01); B01D 2313/243 (2013.01); B01D 2317/022 (2013.01); C02F 2301/08 (2013.01);
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.