Forward osmosis filtration for removal of organic foulants: Effects of combined tannic and alginic acids

Water Research
Lin WangBingzhi Dong

Abstract

The filtration performance of combined organic foulants by forward osmosis (FO) in active-layer-facing-the-draw-solution (AL-facing-DS) orientation was investigated systematically. Tannic acid and alginate were used as model organic foulants for polysaccharides and humic dissolved organic matters, respectively. The FO could reject combined and single tannic acid and alginate foulants effectively. The more severe fouling flux decline, accompanied with lower combined foulants' retention, was observed with increasing proportions of tannic acid in the combined foulants-containing feed, which was ascribed mainly to the more severe fouling resulting from tannic acid adsorption within the porous support layer of the FO membrane compared to minor alginate deposition on the membrane surface. It was found that the higher the initial flux level and cross flow velocity, the faster the flux decline with lower mixed foulants retention. It was also revealed that the calcium ions in a basic solution enhanced the combined fouling flux reduction and combined foulants retention. As the major constituent of the combined fouling layer, the adsorption of tannic acid might play a more significant role in the mixed fouling of the FO membrane, which wa...Continue Reading

References

Jan 11, 2007·Journal of Hazardous Materials·Yi-Li LinE-E Chang
Jan 24, 2007·Water Research·Sangyoup Lee, Menachem Elimelech
Aug 19, 2007·Environmental Science & Technology·Chuyang Y Tang, James O Leckie
Aug 26, 2010·Environmental Science & Technology·Yining WangAnthony G Fane
Oct 28, 2011·Environmental Science & Technology·Laura A HooverMenachem Elimelech

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Citations

Aug 3, 2017·Applied Microbiology and Biotechnology·Kun DaiRaymond J Zeng
Dec 7, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Wanzhu ZhangBingzhi Dong
May 22, 2018·Environmental Science and Pollution Research International·Wanzhu Zhang, Bingzhi Dong

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