In-line flocculation-submersed MF/UF membrane hybrid system in tertiary wastewater treatment

doi:10.1080/01496390801974548

CNU IR > College of Sustainable Environment and Recreation > Dept. of Environmental Engineering and Science (including master's program) > Periodical Articles > Item 310902800/21689

Please use this identifier to cite or link to this item: https://ir.cnu.edu.tw/handle/310902800/21689

Title:	In-line flocculation-submersed MF/UF membrane hybrid system in tertiary wastewater treatment
Authors:	Laszlo Erdei Chia-Yuan Chang Saravanamuthu Vigneswaran
Contributors:	環境工程與科學系
Keywords:	In-line flocculation membrane fouling hybrid system wastewater reuse
Date:	2008-05
Issue Date:	2009-10-05 14:13:04 (UTC+8)
Abstract:	Coagulation/flocculation pre-treatment of feeds can successfully mitigate the drawbacks of membrane micro- and ultra filtration processes: fouling and limited ability to remove organic pollutants. Laboratory experiments conducted with a synthetic wastewater (representing biologically treated secondary effluent) using 0.1 µm pore size hollow fiber membrane showed that simple in-line flocculation pre-treatment with inorganic coagulants dramatically reduced membrane fouling rates. The hybrid system also ensured over 70% organic matter removal in terms of dissolved organic carbon (DOC). In the experiments in in-line flocculation outperformed clarification pre-treatment at optimum coagulant dosages. Differences in floc characteristics and elevated suspended solids concentrations in the membrane tank may explain this finding, but the exact causes were not investigated in this study. The beneficial effects of in-line flocculation pre-treatment to MF/UF separation were also confirmed in the treatment of septic tank effluent in a membrane bioreactor (MBR). The fouling rate of the 0.4 µm pore size (flat-sheet) membrane was substantially reduced with 10-100 mg L-1 ferric chloride coagulant doses, and total dissolved chemical oxygen demand (DCOD) removal also increased from 66% up to 93%. These findings are consistent with the results of other experimental studies and show that pre-treatment controls submersed MF/UF filtration performance.
Relation:	Separation Science and Technology 43(7)：p.1839-1851
Appears in Collections:	[Dept. of Environmental Engineering and Science (including master's program)] Periodical Articles

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