Nanofiltration separation of highly concentrated multivalent electrolyte draw solution; a pilot plant study

Ali Altaee, Adel O. Sharif, Malak Hamdan

Research output: Contribution to journalArticle

Abstract

Nanofiltration membrane system is proposed for the regeneration of draw solution in a two-stage forward osmosis (FO) process. Pilot plant experiments were carried out on two types of multivalent electrolyte draw solutions, MgSO4 and MgCl2. Two commercial size NF90-4040 Filmtec Nanofiltration (NF) membranes were packed in a high-pressure vessel for the regeneration of draw solution. The concentrations of the draw solution used were between 20 and 118 g/L. The impact of feed concentration, flow rate and feed pressure on the performance of NF membrane was investigated. Both metal salts have shown a high rejection rate by the NF membrane. The rejection rate to the MgSO4 was slightly higher than that to the MgCl2. Experimental results showed that NF rejection rate and permeate flow rate increased with increasing the feed pressure and flow rate but decreased with increasing the concentration of feed solution. However, this was achieved at the expense of higher power consumption. In general, the efficiency of NF system for the regeneration of draw solution was higher at lower feed concentration. This suggests that NF separation method is probably more suitable for the regeneration of low concentration draw solution which is generated from brackish water FO treatment plants. Furthermore, NF application in the regeneration of high-concentration draw solution is not yet feasible due to the limitations in the NF process such operating feed pressure and rejection rate.

Original languageEnglish
JournalDesalination and Water Treatment
DOIs
Publication statusAccepted/In press - 30 Oct 2015

Fingerprint

Nanofiltration
Pilot plants
electrolyte
Electrolytes
Nanofiltration membranes
regeneration
membrane
Osmosis
Flow rate
osmosis
pilot plant
rate
Pressure vessels
brackish water
Electric power utilization
vessel
Salts
salt
metal
Metals

Keywords

  • Draw solution regeneration
  • Electrolyte rejection
  • Membrane desalination
  • Nanofiltration
  • Seawater desalination

ASJC Scopus subject areas

  • Pollution
  • Water Science and Technology
  • Ocean Engineering

Cite this

@article{6742b3a111f340ce90753f2c38894e87,
title = "Nanofiltration separation of highly concentrated multivalent electrolyte draw solution; a pilot plant study",
abstract = "Nanofiltration membrane system is proposed for the regeneration of draw solution in a two-stage forward osmosis (FO) process. Pilot plant experiments were carried out on two types of multivalent electrolyte draw solutions, MgSO4 and MgCl2. Two commercial size NF90-4040 Filmtec Nanofiltration (NF) membranes were packed in a high-pressure vessel for the regeneration of draw solution. The concentrations of the draw solution used were between 20 and 118 g/L. The impact of feed concentration, flow rate and feed pressure on the performance of NF membrane was investigated. Both metal salts have shown a high rejection rate by the NF membrane. The rejection rate to the MgSO4 was slightly higher than that to the MgCl2. Experimental results showed that NF rejection rate and permeate flow rate increased with increasing the feed pressure and flow rate but decreased with increasing the concentration of feed solution. However, this was achieved at the expense of higher power consumption. In general, the efficiency of NF system for the regeneration of draw solution was higher at lower feed concentration. This suggests that NF separation method is probably more suitable for the regeneration of low concentration draw solution which is generated from brackish water FO treatment plants. Furthermore, NF application in the regeneration of high-concentration draw solution is not yet feasible due to the limitations in the NF process such operating feed pressure and rejection rate.",
keywords = "Draw solution regeneration, Electrolyte rejection, Membrane desalination, Nanofiltration, Seawater desalination",
author = "Ali Altaee and Sharif, {Adel O.} and Malak Hamdan",
year = "2015",
month = "10",
day = "30",
doi = "10.1080/19443994.2015.1108876",
language = "English",
journal = "Desalination and Water Treatment",
issn = "1944-3994",
publisher = "Taylor and Francis Ltd.",

}

TY - JOUR

T1 - Nanofiltration separation of highly concentrated multivalent electrolyte draw solution; a pilot plant study

AU - Altaee, Ali

AU - Sharif, Adel O.

AU - Hamdan, Malak

PY - 2015/10/30

Y1 - 2015/10/30

N2 - Nanofiltration membrane system is proposed for the regeneration of draw solution in a two-stage forward osmosis (FO) process. Pilot plant experiments were carried out on two types of multivalent electrolyte draw solutions, MgSO4 and MgCl2. Two commercial size NF90-4040 Filmtec Nanofiltration (NF) membranes were packed in a high-pressure vessel for the regeneration of draw solution. The concentrations of the draw solution used were between 20 and 118 g/L. The impact of feed concentration, flow rate and feed pressure on the performance of NF membrane was investigated. Both metal salts have shown a high rejection rate by the NF membrane. The rejection rate to the MgSO4 was slightly higher than that to the MgCl2. Experimental results showed that NF rejection rate and permeate flow rate increased with increasing the feed pressure and flow rate but decreased with increasing the concentration of feed solution. However, this was achieved at the expense of higher power consumption. In general, the efficiency of NF system for the regeneration of draw solution was higher at lower feed concentration. This suggests that NF separation method is probably more suitable for the regeneration of low concentration draw solution which is generated from brackish water FO treatment plants. Furthermore, NF application in the regeneration of high-concentration draw solution is not yet feasible due to the limitations in the NF process such operating feed pressure and rejection rate.

AB - Nanofiltration membrane system is proposed for the regeneration of draw solution in a two-stage forward osmosis (FO) process. Pilot plant experiments were carried out on two types of multivalent electrolyte draw solutions, MgSO4 and MgCl2. Two commercial size NF90-4040 Filmtec Nanofiltration (NF) membranes were packed in a high-pressure vessel for the regeneration of draw solution. The concentrations of the draw solution used were between 20 and 118 g/L. The impact of feed concentration, flow rate and feed pressure on the performance of NF membrane was investigated. Both metal salts have shown a high rejection rate by the NF membrane. The rejection rate to the MgSO4 was slightly higher than that to the MgCl2. Experimental results showed that NF rejection rate and permeate flow rate increased with increasing the feed pressure and flow rate but decreased with increasing the concentration of feed solution. However, this was achieved at the expense of higher power consumption. In general, the efficiency of NF system for the regeneration of draw solution was higher at lower feed concentration. This suggests that NF separation method is probably more suitable for the regeneration of low concentration draw solution which is generated from brackish water FO treatment plants. Furthermore, NF application in the regeneration of high-concentration draw solution is not yet feasible due to the limitations in the NF process such operating feed pressure and rejection rate.

KW - Draw solution regeneration

KW - Electrolyte rejection

KW - Membrane desalination

KW - Nanofiltration

KW - Seawater desalination

UR - http://www.scopus.com/inward/record.url?scp=84945589079&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84945589079&partnerID=8YFLogxK

U2 - 10.1080/19443994.2015.1108876

DO - 10.1080/19443994.2015.1108876

M3 - Article

AN - SCOPUS:84945589079

JO - Desalination and Water Treatment

JF - Desalination and Water Treatment

SN - 1944-3994

ER -