Trace organic solutes in closed-loop forward osmosis applications: Influence of membrane fouling and modeling of solute build-up

D’Haese, Arnout; Le‐Clech, Pierre; Nevel, Sam Van; Verbeken, Kim; Cornelissen, Emile; Khan, Stuart J.; Verliefde, Arne

doi:10.1016/j.watres.2013.06.006

Cited by 92 publications

(51 citation statements)

References 42 publications

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“…However, process modeling of FO pretreatment for seawater RO desalination indicates that boron removal could be achieved more energy-efficiently with an FO-RO system than a conventional two-pass RO process [119]. While the FO-RO system shows promise for TrOC and boron removal, different rejection rates for TrOCs or boron in the FO and RO processes may result in their accumulation in the draw solution of a closed-loop FO-RO system and may potentially degrade product water quality [119,120]. Adsorption by activated carbon, ultraviolet light oxidation [27], and draw solution bleeding [119] have been suggested as mechanisms to mitigate contaminant accumulation in the closed-loop draw solution.…”

Section: Fo Pretreatment Can Improve the Permeate Quality Produced Bymentioning

confidence: 99%

Forward osmosis: Where are we now?

et al. 2015

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Section: Fo Pretreatment Can Improve the Permeate Quality Produced Bymentioning

confidence: 99%

Forward osmosis: Where are we now?

et al. 2015

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“…6 L); and ∆V is the permeate volume passed through the FO membrane between time t and t+∆t. It is noteworthy that TrOCs that permeated through the FO but not the RO membrane can accumulate in the draw solution [26]. Thus, C * Draw is determined from the mass balance:…”

Section: Water Quality Parametersmentioning

confidence: 99%

Evaluating ionic organic draw solutes in osmotic membrane bioreactors for water reuse

Luo

Hai

Price

et al. 2016

Journal of Membrane Science

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The performance of two ionic organic draw solutes, namely sodium acetate (NaOAc) and ethylene-diaminetetra acetic acid disodium salt (EDTA-2Na), during osmotic membrane bioreactor (OMBR) operation was investigated in this study. Their performance was compared to that of sodium chloride (NaCl). A reverse osmosis (RO) process was integrated with OMBR to form an OMBR-RO hybrid system for draw solute recovery and clean water production. Results show that the NaOAc and EDTA-2Na draw solutes significantly reduced salinity build-up in the bioreactor in comparison with NaCl during OMBR operation. At the same osmotic pressure, these two ionic organic draw solutions produced slightly lower water flux, but considerably less reverse salt flux than NaCl. Compared to NaCl and NaOAc, EDTA-2Na resulted in significantly less fouling to the forward osmosis membrane. Regardless of the draw solutes, the OMBR-RO hybrid system could remove all 31 trace organic contaminants investigated in this study by more than 97%. Results reported here suggest that ionic organic draw solutes can be used to mitigate salinity build-up in the bioreactor during OMBR operation. AbstractThe performance of two ionic organic draw solutes, namely sodium acetate (NaOAc) and ethylene-diamine-tetra acetic acid disodium salt (EDTA-2Na), during osmotic membrane bioreactor (OMBR) operation was investigated in this study. Their performance was compared to that of sodium chloride (NaCl). A reverse osmosis (RO) process was integrated with OMBR to form an OMBR-RO hybrid system for draw solute recovery and clean water production. Results show that the NaOAc and EDTA-2Na draw solutes significantly reduced salinity build-up in the bioreactor in comparison with NaCl during OMBR operation. At the same osmotic pressure, these two ionic organic draw solutions produced slightly lower water flux, but considerably less reverse salt flux than NaCl. Compared to NaCl and NaOAc, EDTA-2Na resulted in significantly less fouling to the forward osmosis membrane.Regardless of the draw solutes, the OMBR-RO hybrid system could remove all 31 trace organic contaminants investigated in this study by more than 97%. Results reported here suggest that ionic organic draw solutes can be used to mitigate salinity build-up in the bioreactor during OMBR operation.

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“…The fouling mechanisms in FO systems may be different from those in pressure-driven membrane processes such as nanofiltration (NF) or RO [23][24][25]. A distinct difference in mass transport in osmosis-driven membrane processes, compared to pressure-driven membrane processes, is the occurrence of internal concentration polarisation (ICP), which occurs in the membrane porous layer [26].…”

Section: Introductionmentioning

confidence: 99%