US 12,391,585 B2
System and method for performing electrochemically-cycled oxidation on landfill leachate
Yugo Sato, Kowloon (HK); Guanghao Chen, Kowloon (HK); and Yuewei Liu, Kowloon (HK)
Assigned to THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, Hong Kong (CN)
Filed by THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, Kowloon (HK)
Filed on May 9, 2023, as Appl. No. 18/195,243.
Claims priority of provisional application 63/340,409, filed on May 10, 2022.
Prior Publication US 2023/0365441 A1, Nov. 16, 2023
Int. Cl. C02F 1/467 (2023.01); C02F 1/32 (2023.01); C02F 1/461 (2023.01); C02F 103/06 (2006.01)
CPC C02F 1/4674 (2013.01) [C02F 1/325 (2013.01); C02F 1/46109 (2013.01); C02F 2001/46133 (2013.01); C02F 2103/06 (2013.01); C02F 2201/4614 (2013.01); C02F 2201/4615 (2013.01); C02F 2201/4617 (2013.01); C02F 2303/185 (2013.01); C02F 2305/023 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for performing electrochemically-cycled oxidation on landfill leachate, comprising:
a housing divided into first and second reactor chambers, the housing having an inlet adapted for introducing a stream of landfill leachate to be treated into the first reactor chamber, and the housing further having an outlet for releasing a stream of fully treated landfill leachate from the second reactor chamber;
an anode and a cathode received within the first reactor chamber, wherein the anode comprises a metal oxide;
an electrical power supply connected to the anode and the cathode, wherein electrochemical oxidation is performed on the landfill leachate in the first reactor chamber to produce hypochlorite (OCl−);
at least one first source of ultraviolet radiation received within the first reactor chamber, wherein the at least one source of ultraviolet radiation applies first ultraviolet radiation to the landfill leachate and the hypochlorite (OCl−) following initiation of the electrochemical oxidation of the landfill leachate, wherein the application of the first ultraviolet radiation to the hypochlorite (OCl−) produces hydroxyl radicals (OH•) and reactive chlorine species, the hypochlorite (OCl−), the hydroxyl radicals (OH•) and the reactive chlorine species breaking bonds in organic materials in the landfill leachate which have an ultraviolet absorbance at 254 nm, resulting in a partially-treated landfill leachate; and
at least one second source of ultraviolet radiation received within the second reactor chamber, a portion of the partially-treated landfill leachate flowing into the second reactor chamber such that application of second ultraviolet radiation produced by the at least one second source of ultraviolet radiation thereon removes residual chlorine therefrom by photolysis to produce the fully treated landfill leachate, the fully treated landfill leachate being extracted from the second reactor chamber through the outlet.