US 12,286,372 B2
Method and apparatus for treating wastewater
Seung Joon Chung, Suwon (KR); and Han Uk Lee, Suwon (KR)
Assigned to SAMSUNG E&A CO., LTD., Seoul (KR)
Filed by Samsung E&A Co., Ltd., Seoul (KR)
Filed on Jun. 12, 2024, as Appl. No. 18/740,954.
Claims priority of application No. 10-2023-0078213 (KR), filed on Jun. 19, 2023.
Prior Publication US 2024/0417300 A1, Dec. 19, 2024
Int. Cl. C02F 9/00 (2023.01); C02F 1/32 (2023.01); C02F 1/52 (2023.01); C02F 1/56 (2023.01); C02F 1/66 (2023.01); C02F 1/72 (2023.01); C02F 3/12 (2023.01); C02F 1/00 (2023.01); C02F 101/10 (2006.01); C02F 101/14 (2006.01); C02F 101/30 (2006.01); C02F 103/34 (2006.01)
CPC C02F 9/00 (2013.01) [C02F 1/32 (2013.01); C02F 1/5245 (2013.01); C02F 1/56 (2013.01); C02F 1/66 (2013.01); C02F 1/725 (2013.01); C02F 3/12 (2013.01); C02F 2001/007 (2013.01); C02F 1/008 (2013.01); C02F 2101/105 (2013.01); C02F 2101/14 (2013.01); C02F 2101/30 (2013.01); C02F 2103/346 (2013.01); C02F 2201/326 (2013.01); C02F 2301/08 (2013.01); C02F 2305/10 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for treating wastewater configured to remove hydrogen peroxide, refractory organic matter, fluorine, phosphorus, suspended solids (SS), total nitrogen (T-N), biochemical oxygen demand (BOD), particulate matter and ionic substances in wastewater, the method comprising:
a step (S10-1) of passing the wastewater through a UV reaction tank to produce first treated water;
a step (S10-2) of passing the first treated water through a pH adjustment tank to produce second treated water;
a step (S10-3) of passing the second treated water through a first flocculation tank to produce third treated water;
a step (S10-4) of passing the third treated water through a second flocculation tank to produce fourth treated water;
a step (S10-5) of passing the fourth treated water through an inorganic sedimentation tank to produce fifth treated water and sludge;
a step (S10-6) of passing the fifth treated water through a biological treatment reactor to produce sixth treated water; and
a step (S10-7) of passing the sixth treated water through an organic sedimentation tank to produce seventh treated water,
wherein, in the step (S10-1), a UV irradiation intensity of the UV reaction tank is adjusted according to a hydrogen peroxide concentration of the wastewater, a refractory organic matter concentration of the wastewater, and a refractory organic matter concentration of the fifth treated water discharged from the inorganic sedimentation tank,
wherein the UV reaction tank comprises a photocatalyst configured to promote decomposition of refractory organic matter in the wastewater during UV irradiation,
wherein a first chemical is added to the pH adjustment tank, the first chemical and a second chemical are added to the first flocculation tank, and a third chemical is added to the second flocculation tank,
wherein the first chemical includes slaked lime, the second chemical includes a fluorine remover, and the third chemical includes a polymer coagulant,
wherein a pH of the pH adjustment tank is adjusted to be in a range of about 3.5 to about 6.0,
wherein a concentration of the second chemical in the first flocculation tank is adjusted to about 800 to about 1,700 ppm.