Abstract
To minimize scale formation potential in the applications of reverse osmosis (RO) membranes as a pretreatment unit, relatively loose nanofiltration (NF) membrane systems coupled with ultrafiltration (UF) were used to remove divalent ions from seawater. However, the UF did not reject any ions because of pore size. The rejection of divalent ions by NF was in order of sulfate (>95%), magnesium (>60%), and calcium (>30%) in every rejection experiment based on water recovery rate (40, 50, 60, 70, and 80%). In the UF/NF/RO hybrid pilot system, most of the divalent (>99%) and the monovalent (>97%) ions were effectively rejected with slightly increased divalent ion rejection compared to the UF/RO system. Seawater temperature influenced rejection of ions with regards to either the diffusion- or convection-dominant transport of ions through the membrane pores. Electric power consumption was also compared between the UF/NF/RO process and the UF/RO process. For different salinity conditions (28,000 and 45,000 mg/L of total dissolved solids), the lowest energy consumption by NF/RO was 3.3 and 6 kWh/m3 with recovery of 80% for NF and 40% for RO, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 1-10 |
| Number of pages | 10 |
| Journal | Desalination and Water Treatment |
| DOIs | |
| Publication status | Accepted/In press - 2015 Nov 20 |
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Keywords
- Desalination
- Divalent ions
- Energy consumption
- Nanofiltration
- Scaling
- SWRO
ASJC Scopus subject areas
- Pollution
- Water Science and Technology
- Ocean Engineering
Cite this
Application of nanofiltration pretreatment to remove divalent ions for economical seawater reverse osmosis desalination. / Park, Minho; Park, Jongkwan; Lee, Eunkyung; Khim, Jeehyeong; Cho, Jaeweon.
In: Desalination and Water Treatment, 20.11.2015, p. 1-10.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Application of nanofiltration pretreatment to remove divalent ions for economical seawater reverse osmosis desalination
AU - Park, Minho
AU - Park, Jongkwan
AU - Lee, Eunkyung
AU - Khim, Jeehyeong
AU - Cho, Jaeweon
PY - 2015/11/20
Y1 - 2015/11/20
N2 - To minimize scale formation potential in the applications of reverse osmosis (RO) membranes as a pretreatment unit, relatively loose nanofiltration (NF) membrane systems coupled with ultrafiltration (UF) were used to remove divalent ions from seawater. However, the UF did not reject any ions because of pore size. The rejection of divalent ions by NF was in order of sulfate (>95%), magnesium (>60%), and calcium (>30%) in every rejection experiment based on water recovery rate (40, 50, 60, 70, and 80%). In the UF/NF/RO hybrid pilot system, most of the divalent (>99%) and the monovalent (>97%) ions were effectively rejected with slightly increased divalent ion rejection compared to the UF/RO system. Seawater temperature influenced rejection of ions with regards to either the diffusion- or convection-dominant transport of ions through the membrane pores. Electric power consumption was also compared between the UF/NF/RO process and the UF/RO process. For different salinity conditions (28,000 and 45,000 mg/L of total dissolved solids), the lowest energy consumption by NF/RO was 3.3 and 6 kWh/m3 with recovery of 80% for NF and 40% for RO, respectively.
AB - To minimize scale formation potential in the applications of reverse osmosis (RO) membranes as a pretreatment unit, relatively loose nanofiltration (NF) membrane systems coupled with ultrafiltration (UF) were used to remove divalent ions from seawater. However, the UF did not reject any ions because of pore size. The rejection of divalent ions by NF was in order of sulfate (>95%), magnesium (>60%), and calcium (>30%) in every rejection experiment based on water recovery rate (40, 50, 60, 70, and 80%). In the UF/NF/RO hybrid pilot system, most of the divalent (>99%) and the monovalent (>97%) ions were effectively rejected with slightly increased divalent ion rejection compared to the UF/RO system. Seawater temperature influenced rejection of ions with regards to either the diffusion- or convection-dominant transport of ions through the membrane pores. Electric power consumption was also compared between the UF/NF/RO process and the UF/RO process. For different salinity conditions (28,000 and 45,000 mg/L of total dissolved solids), the lowest energy consumption by NF/RO was 3.3 and 6 kWh/m3 with recovery of 80% for NF and 40% for RO, respectively.
KW - Desalination
KW - Divalent ions
KW - Energy consumption
KW - Nanofiltration
KW - Scaling
KW - SWRO
UR - http://www.scopus.com/inward/record.url?scp=84947727502&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84947727502&partnerID=8YFLogxK
U2 - 10.1080/19443994.2015.1111807
DO - 10.1080/19443994.2015.1111807
M3 - Article
AN - SCOPUS:84947727502
SP - 1
EP - 10
JO - Desalination and Water Treatment
JF - Desalination and Water Treatment
SN - 1944-3994
ER -