TY - JOUR
T1 - Enhanced treatment properties of iron oxide amended sands coupled with polyelectrolyte to humic acid
AU - Li, Dongmei
AU - Wu, Cuiru
AU - Wang, Yizhi
AU - Jiang, Shuxian
AU - Li, Shaoxiu
AU - Liang, Jinling
AU - Zhang, Wen
N1 - Funding Information:
The authors would like to thank the National Natural Science Foundation of China (Nos. 51378129 and 51108094), the Natural Science Foundation of Guangdong Province (No. 2015A030313494, No. 2017A030313321) and the Innovative Projects Funded by Ministry of Advanced Education of Guangdong Province (No: 2016KTSCX035) for their financial support. The first author (D M Li) was also supported by the China Scholarship Council.
PY - 2018/2/1
Y1 - 2018/2/1
N2 - To improve the removal efficiency of micropollutant humic acid at low temperature, microflocculation filtration experiments were conducted with homemade iron oxide amended sands (IOAS), cationic polyelectrolyte (CPE) and polyaluminium chloride (PACl). Fractal properties of flocs structures and IOAS surface and their effects on the removal efficiency of humic acid were investigated. Results showed that IOAS had a porous surface with fractal dimensions (D) (D = 1.744) and a strong adsorption capacity for humic acid. The flocs produced by PACl were small in size, loosely packed with a higher D, and therefore settled slowly. By contrast, the formed flocs by adding CPE with only 1~5% of PACl had strong and open structures with a high effective density, rapid settling velocity and a lower D. Compared with PACl flocs, the larger size CPE flocs and PACl+CPE flocs deposited and packed up on IOAS, creating smaller pores and resulting in a lower D and higher filtration capacity.
AB - To improve the removal efficiency of micropollutant humic acid at low temperature, microflocculation filtration experiments were conducted with homemade iron oxide amended sands (IOAS), cationic polyelectrolyte (CPE) and polyaluminium chloride (PACl). Fractal properties of flocs structures and IOAS surface and their effects on the removal efficiency of humic acid were investigated. Results showed that IOAS had a porous surface with fractal dimensions (D) (D = 1.744) and a strong adsorption capacity for humic acid. The flocs produced by PACl were small in size, loosely packed with a higher D, and therefore settled slowly. By contrast, the formed flocs by adding CPE with only 1~5% of PACl had strong and open structures with a high effective density, rapid settling velocity and a lower D. Compared with PACl flocs, the larger size CPE flocs and PACl+CPE flocs deposited and packed up on IOAS, creating smaller pores and resulting in a lower D and higher filtration capacity.
KW - Cationic polyelectrolyte
KW - Fractal dimension
KW - Fractal properties
KW - Iron oxide amended sand
KW - Low temperature micropolluted raw water
KW - Microflocculation depth-bed filtration behaviors
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U2 - 10.2175/106143017x14902968254395
DO - 10.2175/106143017x14902968254395
M3 - Article
C2 - 28337963
AN - SCOPUS:85041456159
SN - 1061-4303
VL - 90
SP - 136
EP - 143
JO - Water Environment Research
JF - Water Environment Research
IS - 2
ER -