US 12,403,450 B2
Denitrification and dephosphorization composite filler, preparation method and application
Haiyan Li, Beijing (CN); Zhaoying Liu, Beijing (CN); Yingjie Shen, Beijing (CN); Haijun Zhang, Beijing (CN); Ziyang Zhang, Beijing (CN); Meipeng Jian, Beijing (CN); Chaohong Tan, Beijing (CN); and Yuanping Fang, Beijing (CN)
Assigned to Beijing University of Civil Engineering and Architecture, Beijing (CN); and China Electronics Engineering Design Institute Co., Ltd., Beijing (CN)
Filed by Beijing University of Civil Engineering and Architecture, Beijing (CN); and China Electronics Engineering Design Institute Co., Ltd., Beijing (CN)
Filed on Jan. 16, 2025, as Appl. No. 19/025,208.
Claims priority of application No. 202410799265.6 (CN), filed on Jun. 20, 2024.
Prior Publication US 2025/0186974 A1, Jun. 12, 2025
Int. Cl. B01J 20/20 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01); C02F 1/28 (2023.01); C02F 3/32 (2023.01); C02F 101/10 (2006.01); C02F 101/16 (2006.01); C02F 103/00 (2006.01)
CPC B01J 20/2803 (2013.01) [B01J 20/20 (2013.01); B01J 20/28004 (2013.01); B01J 20/28019 (2013.01); B01J 20/28059 (2013.01); B01J 20/3007 (2013.01); B01J 20/3042 (2013.01); B01J 20/3071 (2013.01); C02F 1/283 (2013.01); C02F 3/327 (2013.01); C02F 2101/105 (2013.01); C02F 2101/163 (2013.01); C02F 2103/001 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A denitrification and dephosphorization composite filler, wherein the denitrification and dephosphorization composite filler has a spheroidal structure, a particle size of 3-5 mm, a specific surface area of 2-4 m2/g, and load-bearing capacity of ≥500 g;
the denitrification and dephosphorization composite filler is prepared with a polysulfone polymer as a skeleton and a hybrid denitrification electron donor material by an immersion precipitation phase conversion method;
wherein the polysulfone polymer is selected from the group consisting of polysulfone, polyethersulfone and polyarylsulfone;
the hybrid denitrification electron donor material comprises at least one heterotrophic denitrification electron donor material selected from the group consisting of natural carbon source and artificial carbon source, and one autotrophic denitrification electron donor material selected from the group consisting of pyrite, ferro sulphur and combinations thereof;
wherein the denitrification and dephosphorization composite filler is made by a preparation comprising steps of:
S1: putting the polysulfone polymer in an organic solvent, and stirring for dissolving;
S2: adding the solution obtained from S1 into the hybrid denitrification electron donor material and stirring evenly;
S3: dripping the solution obtained from S2 into a non-solvent to form a ball at a dripping rate of 60 to 100 drops per minute, and standing for more than 2 days; and
S4: washing the composite material prepared from S3, and then drying for use;
moreover, the mass fraction of the polysulfone polymer in the solution obtained from step S2 is 5% to 20%.