US 11,718,549 B2
Treatment system and method for drinking water
Wenjun Sun, Guelph (CA); and Jingdong Shi, Beijing (CN)
Assigned to TSINGHUA UNIVERSITY, Beijing (CN)
Appl. No. 17/799,951
Filed by TSINGHUA UNIVERSITY, Beijing (CN)
PCT Filed Apr. 13, 2021, PCT No. PCT/IB2021/053053
§ 371(c)(1), (2) Date Aug. 16, 2022,
PCT Pub. No. WO2022/172070, PCT Pub. Date Aug. 18, 2022.
Claims priority of application No. 202110182570.7 (CN), filed on Feb. 10, 2021.
Prior Publication US 2023/0118796 A1, Apr. 20, 2023
Int. Cl. C02F 9/00 (2023.01); C02F 1/00 (2023.01); C02F 1/28 (2023.01); C02F 1/32 (2023.01); C02F 1/44 (2023.01); C02F 1/78 (2023.01)
CPC C02F 9/00 (2013.01) [C02F 1/008 (2013.01); C02F 1/283 (2013.01); C02F 1/32 (2013.01); C02F 1/444 (2013.01); C02F 1/78 (2013.01); C02F 1/004 (2013.01); C02F 2201/32 (2013.01); C02F 2201/782 (2013.01); C02F 2209/003 (2013.01); C02F 2209/005 (2013.01); C02F 2209/02 (2013.01); C02F 2209/03 (2013.01); C02F 2209/05 (2013.01); C02F 2209/06 (2013.01); C02F 2209/10 (2013.01); C02F 2209/23 (2013.01); C02F 2209/29 (2013.01); C02F 2209/36 (2013.01); C02F 2209/40 (2013.01); C02F 2209/42 (2013.01); C02F 2301/046 (2013.01); C02F 2301/08 (2013.01); C02F 2303/18 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A water treatment system comprising:
a system inlet arrangeable in fluid communication with a source of water to be treated and so as to admit process water to the water treatment system, the system inlet in fluid communication with a plurality of water lines for transporting the process water through the system along a flow path where the process water flows through
a first activated carbon filter,
a second activated carbon filter downstream of the first activated carbon filter,
a particulate filter downstream of the second activated carbon filter, and
a first UV sterilizer downstream of the particulate filter;
a water storage vessel at an end of the flow path for storing water produced by the system;
an ozone subsystem comprising an ozonator for making ozone and at least one junction along the flow path for introducing the ozone into the process water, wherein the ozone subsystem is configured to withdraw water from the water storage vessel and add ozone to the withdrawn water to form ozonated water, and wherein the ozone subsystem is configured to introduce the ozonated water to the process water through a first branch water line connected to the flow path at a first junction located between the second activated carbon filter and the first UV sterilizer and upstream or downstream of the particulate filter, through a second branch water line connected to the flow path at a second junction located between the first activated carbon filter and the second activated carbon filter, and through a third branch water line connected to the flow path at a third junction located upstream of the first activated carbon filter;
a system outlet in fluid communication with the water storage vessel for delivering the water from the water storage vessel to a location outside the water treatment system;
a recycle subsystem that is periodically operable to withdraw water from the water storage vessel to form recycled water, introduce the recycled water to the water lines upstream of the UV sterilizer, and return the recycled water to the water storage vessel; and,
a main programmable logic controller (PLC) for controlling a flow of the process water through the water treatment system and for controlling the recycle subsystem.