US 12,122,700 B2
Method and apparatus for removing iron from humus-rich water
Jorma Pääkkönen, Helsinki (FI); and Timo Tolonen, Hämeenlinna (FI)
Assigned to Allwatec Oy, Hämeenlinna (FI)
Appl. No. 17/610,227
Filed by Allwatec Oy, Hämeenlinna (FI)
PCT Filed May 5, 2020, PCT No. PCT/FI2020/050301
§ 371(c)(1), (2) Date Nov. 10, 2021,
PCT Pub. No. WO2020/229727, PCT Pub. Date Nov. 19, 2020.
Claims priority of application No. 20195391 (FI), filed on May 10, 2019.
Prior Publication US 2022/0340465 A1, Oct. 27, 2022
Int. Cl. C02F 1/00 (2023.01); C02F 1/66 (2023.01); C02F 3/04 (2023.01); C02F 3/34 (2023.01); C02F 9/00 (2023.01); C02F 101/20 (2006.01); C02F 101/30 (2006.01); C02F 103/06 (2006.01)
CPC C02F 9/00 (2013.01) [C02F 1/008 (2013.01); C02F 1/66 (2013.01); C02F 3/04 (2013.01); C02F 3/346 (2013.01); C02F 2101/203 (2013.01); C02F 2101/30 (2013.01); C02F 2103/06 (2013.01); C02F 2209/003 (2013.01); C02F 2209/06 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for treating humus-rich water, with which method iron is removed from the humus-rich water biologically, and in which method the humus-rich water is conveyed through a filter, which filter comprises filter material, wherein before conveying the humus-rich water through the filter, the pH value of the humus-rich water is lowered so that the pH value of the humus-rich water that has been filtered through the filter is 3.1-6.0, iron is removed from the humus-rich water as it precipitates when iron bacteria oxidize it biologically, the precipitated iron binds humus and both the iron and humus adhere to the filter material.