US 12,116,294 B2
Treatment system comprising wood-based organic material and its use in wastewater treatment, and method for removing dissolved organic compounds from wastewater
Sakari Halttunen, Espoo (FI); Matias Penttinen, Espoo (FI); Jonni Ahlgren, Espoo (FI); Susann Härkönen, Espoo (FI); and Marina Shestakova, Espoo (FI)
Assigned to Kemira Oyj, Helsinki (FI)
Appl. No. 17/618,815
Filed by KEMIRA OYJ, Helsinki (FI)
PCT Filed Jun. 12, 2020, PCT No. PCT/FI2020/050419
§ 371(c)(1), (2) Date Dec. 13, 2021,
PCT Pub. No. WO2020/249871, PCT Pub. Date Dec. 17, 2020.
Claims priority of application No. 20195516 (FI), filed on Jun. 14, 2019.
Prior Publication US 2022/0298035 A1, Sep. 22, 2022
Int. Cl. C02F 1/52 (2023.01); C02F 1/56 (2023.01); C02F 1/66 (2023.01); C02F 103/28 (2006.01)
CPC C02F 1/5245 (2013.01) [C02F 1/56 (2013.01); C02F 1/66 (2013.01); C02F 2103/28 (2013.01); C02F 2209/08 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method to treat wastewater originating from pulp and/or paper mill, the method comprising:
obtaining wastewater from the pulp and/or paper mill;
providing a water-soluble synthetic cationic polymer and/or cationic bio-based polymer;
providing wood-based organic material in a form of powder, flakes, chips, sticks and/or other particles having an average particle size <10 mm;
preparing a blend of the wood-based organic material and the water-soluble synthetic cationic polymer and/or cationic bio-based polymer;
providing an Al and/or Fe based inorganic metal coagulant;
combining the Al and/or Fe based inorganic metal coagulant and the blend of the wood-based organic material and the water-soluble synthetic cationic polymer and/or cationic bio-based polymer in a weight ratio of 4:1-1:10; and
adding into the wastewater the combined Al and/or Fe based inorganic metal coagulant and the blend of the wood-based organic material and the water-soluble synthetic cationic polymer and/or cationic bio-based polymer.