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Article: Opportunities to reach economic sustainability in forward osmosis–reverse osmosis hybrids for seawater desalination

TitleOpportunities to reach economic sustainability in forward osmosis–reverse osmosis hybrids for seawater desalination
Authors
Issue Date2015
Citation
Desalination, 2015, v. 363, p. 26-36 How to Cite?
AbstractDespite being energetically attractive, the economic sustainability of forward osmosis (FO) - reverse osmosis (RO) hybrid process for seawater desalination has not yet been fully demonstrated. This study is the first to carry out an extensive economic evaluation of FO-RO hybrid, benchmarked against stand-alone RO system. This assessment clearly highlights that FO-RO hybrid can be beneficial, comparatively to RO, only for high energy costs and/or substantial operational costs savings. It is also demonstrated that improvement in water permeation flux, typically above 30 L·m− 2·h− 1 for classical water recoveries, is an absolute prerequisite to lower investment costs down to an economically acceptable level. Such fluxes are not achieved with current membrane developments when realistic feed and draw solutions are considered. In a second step, a sensitivity analysis was carried out to assess the effects of process parameters on flux in FO, compared to the above-mentioned benchmark. Results indicate that for novel FO membranes, typically a coupling of higher water permeability (A > 5 L·m− 2·h− 1·bar− 1) and lower structural parameter (S < 100 μm) is required. This study also shows that the concept of pressure assisted osmosis (PAO) can help to reach higher fluxes with current commercial membranes, thereby demonstrating more favourable economics compared to state-of-the-art FO membranes.
Persistent Identifierhttp://hdl.handle.net/10722/218709
ISSN
2015 Impact Factor: 4.412
2015 SCImago Journal Rankings: 1.549

 

DC FieldValueLanguage
dc.contributor.authorBlandin, G-
dc.contributor.authorVerliefde, ARD-
dc.contributor.authorTang, C-
dc.contributor.authorLe-Clech, P-
dc.date.accessioned2015-09-18T06:51:12Z-
dc.date.available2015-09-18T06:51:12Z-
dc.date.issued2015-
dc.identifier.citationDesalination, 2015, v. 363, p. 26-36-
dc.identifier.issn0011-9164-
dc.identifier.urihttp://hdl.handle.net/10722/218709-
dc.description.abstractDespite being energetically attractive, the economic sustainability of forward osmosis (FO) - reverse osmosis (RO) hybrid process for seawater desalination has not yet been fully demonstrated. This study is the first to carry out an extensive economic evaluation of FO-RO hybrid, benchmarked against stand-alone RO system. This assessment clearly highlights that FO-RO hybrid can be beneficial, comparatively to RO, only for high energy costs and/or substantial operational costs savings. It is also demonstrated that improvement in water permeation flux, typically above 30 L·m− 2·h− 1 for classical water recoveries, is an absolute prerequisite to lower investment costs down to an economically acceptable level. Such fluxes are not achieved with current membrane developments when realistic feed and draw solutions are considered. In a second step, a sensitivity analysis was carried out to assess the effects of process parameters on flux in FO, compared to the above-mentioned benchmark. Results indicate that for novel FO membranes, typically a coupling of higher water permeability (A > 5 L·m− 2·h− 1·bar− 1) and lower structural parameter (S < 100 μm) is required. This study also shows that the concept of pressure assisted osmosis (PAO) can help to reach higher fluxes with current commercial membranes, thereby demonstrating more favourable economics compared to state-of-the-art FO membranes.-
dc.languageeng-
dc.relation.ispartofDesalination-
dc.titleOpportunities to reach economic sustainability in forward osmosis–reverse osmosis hybrids for seawater desalination-
dc.typeArticle-
dc.identifier.emailTang, C: tangc@hku.hk-
dc.identifier.authorityTang, C=rp01765-
dc.identifier.doi10.1016/j.desal.2014.12.011-
dc.identifier.hkuros251620-
dc.identifier.volume363-
dc.identifier.spage26-
dc.identifier.epage36-

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