Ionic organic acetate-based fertilizers as draw solutions to relieve salt accumulation in forward osmosis membrane bioreactor

Publication Type:
Journal Article
Chinese Journal of Environmental Engineering, 2019, 13, (12), pp. 2853-2862
Issue Date:
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© 2019, Science Press. All right reserved. To solve the problem of salt accumulation in the forward osmosis membrane bioreactor, the performances of forward osmosis (FO) and osmosis membrane bio-reactor (OMBR) with three ionic organic draw solutes, ammonium acetate (NH4C2H3O2), sodium acetate (NaC2H3O2) and potassium acetate (KC2H3O2) were investigated in this study, which were also compared with those of FO and OMBR with three inorganic draw solutes: ammonium sulfate ((NH4)2SO4), sodium chloride (NaCl) and potassium chloride (KCl). Water flux and salt concentration were measured for comparing the performance of the different draw solutes, COD, ammonium and nitrate concentration were measured to evaluate the biodegradability in the bioreactor. The fouled membrane surface was analyzed by SEM. Results show that the average water fluxes of FO were 10.30, 11.07 and 12.73 L•(m2•h)-1 at 0.6 mol•L-1 concentration ammonium acetate, sodium acetate and potassium acetate, respectively, which were lower than those with the inorganic draw solutes. In OMBR process, the ionic organic draw solution could significantly reduce salt accumulation. In addition, when organic fertilizer based on acetate-based ions was used as the draw solution, the biological activity of microorganisms was higher than inorganic fertilizer draw solution, the former could lead to effective removal of organics and nutrients by OMBR though it was easier to form membrane fouling. This study can provide a reference for OMBR practical application.
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