Performance evaluation of hybrid OMBR-MD using organic and inorganic draw solutions

Sher Jamal Khan; Muhammad Saboor Siddique; Hafiz Muhammad Aamir Shahzad

doi:10.2166/wst.2018.345

Performance evaluation of hybrid OMBR-MD using organic and inorganic draw solutions

Sher Jamal Khan^*
, Muhammad Saboor Siddique
, Hafiz Muhammad Aamir Shahzad

^*Corresponding author for this work

National University of Sciences and Technology Pakistan

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

The performance of two inorganic divalent salts (CaCl₂, and MgCl₂) and two organic salts (CH₃COONa and Mg(CH₃COO)₂) was compared with commonly used NaCl in an osmotic membrane bioreactor (OMBR) integrated with a membrane distillation (MD) system. The system was investigated in terms of salinity buildup, flux stability, draw solution (DS) recovery and contaminants removal efficiency. Results indicated that organic DSs not only lessen the salt accumulation within the bioreactor but also increase the pollutant removal efficiency by improving biological treatment. Of all the draw solutions, NaCl and CaCl₂ produced rapid declines in water flux because of the high salt accumulation in the bio-tank as compared to other salts. The DCMD system successfully recovered all organic and inorganic draw solute concentrations as per OMBR requirements. Membrane flushing frequency for the MD system followed the order Mg(CH₃COO)₂ > CH₃COONa > CaCl₂ > MgCl₂ > NaCl. More than 90% removal of chemical oxygen demand (COD), NH₄ ⁺-N, and PO₄ ^3--P was achieved in the permeate for each salt because of the dual barriers of high-retention membranes i.e., forward osmosis and MD.

Original language	English
Pages (from-to)	776-785
Number of pages	10
Journal	Water Science and Technology
Volume	78
Issue number	4
DOIs	https://doi.org/10.2166/wst.2018.345
Publication status	Published - 25 Sept 2018
Externally published	Yes

Keywords

Draw solutes
Flux stability
Reverse solute transport
Salinity buildup

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10.2166/wst.2018.345

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title = "Performance evaluation of hybrid OMBR-MD using organic and inorganic draw solutions",

abstract = "The performance of two inorganic divalent salts (CaCl2, and MgCl2) and two organic salts (CH3COONa and Mg(CH3COO)2) was compared with commonly used NaCl in an osmotic membrane bioreactor (OMBR) integrated with a membrane distillation (MD) system. The system was investigated in terms of salinity buildup, flux stability, draw solution (DS) recovery and contaminants removal efficiency. Results indicated that organic DSs not only lessen the salt accumulation within the bioreactor but also increase the pollutant removal efficiency by improving biological treatment. Of all the draw solutions, NaCl and CaCl2 produced rapid declines in water flux because of the high salt accumulation in the bio-tank as compared to other salts. The DCMD system successfully recovered all organic and inorganic draw solute concentrations as per OMBR requirements. Membrane flushing frequency for the MD system followed the order Mg(CH3COO)2 > CH3COONa > CaCl2 > MgCl2 > NaCl. More than 90\% removal of chemical oxygen demand (COD), NH4 +-N, and PO4 3--P was achieved in the permeate for each salt because of the dual barriers of high-retention membranes i.e., forward osmosis and MD.",

keywords = "Draw solutes, Flux stability, Reverse solute transport, Salinity buildup",

author = "Khan, \{Sher Jamal\} and Siddique, \{Muhammad Saboor\} and Shahzad, \{Hafiz Muhammad Aamir\}",

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doi = "10.2166/wst.2018.345",

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T1 - Performance evaluation of hybrid OMBR-MD using organic and inorganic draw solutions

AU - Khan, Sher Jamal

AU - Siddique, Muhammad Saboor

AU - Shahzad, Hafiz Muhammad Aamir

N1 - Publisher Copyright: © IWA Publishing 2018.

PY - 2018/9/25

Y1 - 2018/9/25

N2 - The performance of two inorganic divalent salts (CaCl2, and MgCl2) and two organic salts (CH3COONa and Mg(CH3COO)2) was compared with commonly used NaCl in an osmotic membrane bioreactor (OMBR) integrated with a membrane distillation (MD) system. The system was investigated in terms of salinity buildup, flux stability, draw solution (DS) recovery and contaminants removal efficiency. Results indicated that organic DSs not only lessen the salt accumulation within the bioreactor but also increase the pollutant removal efficiency by improving biological treatment. Of all the draw solutions, NaCl and CaCl2 produced rapid declines in water flux because of the high salt accumulation in the bio-tank as compared to other salts. The DCMD system successfully recovered all organic and inorganic draw solute concentrations as per OMBR requirements. Membrane flushing frequency for the MD system followed the order Mg(CH3COO)2 > CH3COONa > CaCl2 > MgCl2 > NaCl. More than 90% removal of chemical oxygen demand (COD), NH4 +-N, and PO4 3--P was achieved in the permeate for each salt because of the dual barriers of high-retention membranes i.e., forward osmosis and MD.

AB - The performance of two inorganic divalent salts (CaCl2, and MgCl2) and two organic salts (CH3COONa and Mg(CH3COO)2) was compared with commonly used NaCl in an osmotic membrane bioreactor (OMBR) integrated with a membrane distillation (MD) system. The system was investigated in terms of salinity buildup, flux stability, draw solution (DS) recovery and contaminants removal efficiency. Results indicated that organic DSs not only lessen the salt accumulation within the bioreactor but also increase the pollutant removal efficiency by improving biological treatment. Of all the draw solutions, NaCl and CaCl2 produced rapid declines in water flux because of the high salt accumulation in the bio-tank as compared to other salts. The DCMD system successfully recovered all organic and inorganic draw solute concentrations as per OMBR requirements. Membrane flushing frequency for the MD system followed the order Mg(CH3COO)2 > CH3COONa > CaCl2 > MgCl2 > NaCl. More than 90% removal of chemical oxygen demand (COD), NH4 +-N, and PO4 3--P was achieved in the permeate for each salt because of the dual barriers of high-retention membranes i.e., forward osmosis and MD.

KW - Draw solutes

KW - Flux stability

KW - Reverse solute transport

KW - Salinity buildup

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DO - 10.2166/wst.2018.345

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AN - SCOPUS:85054967858

SN - 0273-1223

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SP - 776

EP - 785

JO - Water Science and Technology

JF - Water Science and Technology

IS - 4

ER -

Performance evaluation of hybrid OMBR-MD using organic and inorganic draw solutions

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Keywords

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