Combination of forward osmosis (FO) process with coagulation/flocculation (CF) for potential treatment of textile wastewater

Water Research
Gang HanChristian Maletzko

Abstract

A novel combination of forward osmosis (FO) process with coagulation/flocculation (CF) (FO-CF) has been experimentally conceived for the treatment and reuse of textile wastewater. FO is employed to spontaneously recover water from the wastewater via osmosis and thus effectively reduces its volume with a dramatically enhanced dye concentration. CF is then applied to precipitate and remove dyes from the FO concentrated stream with much improved efficiency and reduced chemical dosage. The FO-CF hybrid system exhibits unique advantages of high water flux and recovery rate, well controlled membrane fouling, high efficiency, and minimal environmental impact. Using a lab-made thin-film composite (TFC) FO membrane, an initial water flux (Jw) of 36.0 L m(-2) h(-1) with a dye rejection of 99.9% has been demonstrated by using 2 M NaCl as the draw solution and synthetic textile wastewater containing multiple textile dyes, inorganic salts and organic additives as the feed under the FO mode. The Jw could be maintained at a high value of 12.0 L m(-2) h(-1) even when the recovery rate of the wastewater reaches 90%. Remarkable reverse fouling behavior has also been observed where the Jw of the fouled membrane can be almost fully restored to the...Continue Reading

References

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Citations

Jul 31, 2016·Environmental Science and Pollution Research International·A Bedolla-GuzmanJuan M Peralta-Hernández
Aug 14, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Wendong WangMawuli Dzakpasu
Dec 5, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Estella Z JingxiMarshall S Sheldon
Apr 27, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·W MaknakornW Khongnakorn
Jul 26, 2018·Membranes·Anita Haupt, André Lerch
Aug 29, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Cigdem Balcik-CanbolatBulent Keskinler
Feb 8, 2019·Separation and Purification Technology·Suhas P DharupaneediTejraj M Aminabhavi
Dec 31, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Jie ChenRun Zhang

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