Open AccessFlocculation-Magnetic Separation Technology for the Rapid Treatment of First Flush Rain
Author(s) -
Hui Feng,
Xiao-chen Jia,
Xuehong Gu,
Zhilong Su,
Rui Wang,
Pingping Qin,
Ye Ding
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/450/1/012085
Subject(s) - flocculation , superparamagnetism , magnetite , fourier transform infrared spectroscopy , microsphere , turbidity , sedimentation , adsorption , materials science , magnetic separation , nuclear chemistry , chemistry , chemical engineering , metallurgy , magnetic field , geology , paleontology , physics , magnetization , oceanography , organic chemistry , quantum mechanics , sediment , engineering
In order to rapid treatment of first flush rainwater, a new flocculation-magnetic microsphere was prepared. And magnetic microspheres were prepared using the modified Stöber method. Magnetite (Fe 3 O 4 )-silica (SiO 2 ) core-shell microspheres have superparamagnetism verified by using XRD, FTIR and VSM analysis. Also, Fe 3 O 4 /SiO 2 (FS) microspheres have no significant reduction after at least reused five times. The optimal feeding order and conditions were flocculant, magnetic powder and PAM, reaction temperature 25 °C, static sedimentation time 30 min, and pH=7. Under the optimized condition, 62% of COD and 98% of turbidity were removed. Especially, Fe 3 O 4 /SiO 2 microspheres can effectively adsorb heavy metal ion.