TY - JOUR
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
UR - http://www.scopus.com/inward/record.url?scp=85054967858&partnerID=8YFLogxK
U2 - 10.2166/wst.2018.345
DO - 10.2166/wst.2018.345
M3 - Article
C2 - 30252655
AN - SCOPUS:85054967858
SN - 0273-1223
VL - 78
SP - 776
EP - 785
JO - Water Science and Technology
JF - Water Science and Technology
IS - 4
ER -