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- Title
Preparation of cellulose triacetate forward osmosis membranes for treating esterification wastewater.
- Authors
Quanju Ji; Zheng Lv; Yanbin Yun; Jianbo Li; Chunli Li; Shouwei Zhu
- Abstract
Cellulose triacetate (CTA) membranes for forward osmosis (FO) were prepared by phase inversion. Effects of the polymer concentrations, solvents (1,4-dioxane, N-methylpyrrolidone, N, N-dimethylformamide), additives (lactic acid and PVP-K30) on the FO membrane performance and gelation kinetics mechanism were explored. The pre-treated esterification wastewater was further treated via the optional membrane under the FO mode, the long-term FO performance and fouling behaviors of CTA membranes are further investigated. Results showed that the CTA membrane cast using 1,4-dioxane as solvent has shown lower water flux but higher salt rejection, whereas the membrane cast using N-methylpyrrolidone or N, N-dimethylformamide as solvent has excellent permeability but poor selectivity. The water flux and reverse salt flux reduced with the increase of CTA concentration. As the lactic acid and PVP-K30 increased, the gelation velocity accelerated, the water flux and reverse salt flux enhanced. Furthermore, the water flux went down significantly by 51.1% in the long-term test. Especially in the early 5 h, the flux declined sharply from 9.56 LMH to about 6.0 LMH, and then the water flux reduced slowly since the membrane fouling become to stability. FO treatment brought about 57.1% of water recovery and favorable pollutants rejection with TOC rejection exceeding 96%.
- Subjects
TRIACETATE; LACTIC acid; OSMOSIS; REVERSE osmosis process (Sewage purification); REVERSE osmosis; GELATION kinetics; ESTERIFICATION; CELLULOSE
- Publication
Desalination & Water Treatment, 2017, Vol 61, p88
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2016.0129