Enhanced dewatering of dredging slurry by Fenton preoxidation and composite coagulants: optimization experiments and dewatering mechanisms.

Publisher: Springer Country of Publication: Germany NLM ID: 9441769 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1614-7499 (Electronic) Linking ISSN: 09441344 NLM ISO Abbreviation: Environ Sci Pollut Res Int Subsets: MEDLINE

Publication: <2013->: Berlin : Springer
Original Publication: Landsberg, Germany : Ecomed

Hydrogen Peroxide*/chemistry ; Oxidation-Reduction*; Iron/chemistry ; China ; Ferric Compounds/chemistry ; Lakes/chemistry

In this work, the Fenton preoxidation and composite coagulant method was used to carry out the rapid dewatering experiment of Chaohu Lake (China) dredging slurry. The changes in extracellular polymeric substances (EPS), particle size distribution, zeta potential, specific resistance to filtration (SRF), and capillary suction time (CST) of the dredging slurry were characterized. The results showed that the molar ratio of H 2 O 2 and Fe ²⁺ had the greatest effect on the dewatering of dredging slurry by Fenton preoxidation. The coagulant selected through the coagulation test was polyaluminum ferric chloride. The model simulated by the response surface method exhibited significant adaptability and high accuracy (p < 0.01, R ²  = 0.9461, accuracy is 12.115). Fenton preoxidation resulted in the transformation of tightly bound EPS to soluble EPS. After preoxidation-coagulation treatment, the dewatering performance of the slurry improved significantly. The EPS quantity rose by 20.3%, while the SRF (3.65 × 10 ⁹ s ² /g), CST (71.25 s), and zeta potential (- 28.0 mV) shifted to 0.33 × 10 ⁹ s ² /g, 27.60 s, and - 14.9 mV, respectively. The disintegration of EPS by Fenton peroxidation and the subsequent adsorption bridging and charge neutralization through coagulation were the key mechanism for improving the dewatering performance of the dredging slurry.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)

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22076036 National Natural Science Foundation of China; 2021-KJQD-021 Key Science and Technology Projects of Transportation Industry in Anhui Province; 2021-HY-07 Shipping Research Project of Diverting Water from the Yangtze River to Huaihe River

Keywords: Composite coagulants; Dewatering mechanisms; Dredging slurry; Extracellular polymeric substances; Fenton preoxidation

BBX060AN9V (Hydrogen Peroxide)
E1UOL152H7 (Iron)
0 (Ferric Compounds)

Date Created: 20240802 Date Completed: 20240830 Latest Revision: 20240830

20240831

10.1007/s11356-024-34556-4

39093396