Abstract
A modelling and simulation study with economic evaluation was carried out for an advanced membrane-integrated hybrid treatment process that ensures reuse of water with recovery of ammoniacal nitrogen as struvite from coke-oven wastewater. Linearized transport model was developed based on extended Nernst-Plank and concentration polarization modulus equation. Effects of pH, transmembrane pressure and cross-flow rate of interest on membrane charge density, solute rejection and solvent flux were investigated. The membrane module was successful in yielding a pure water flux as high as 120 L m−2 h−1 removing more than 95 and 96 % of the cyanide and phenol, respectively, while permeating more than 90 % NH4 +-N at a transmembrane pressure of only 15 × 102 KPa and at a pH of 10 for a volumetric cross-flow rate of 800 L h−1. The Fenton’s reagents were used to degrade more than 99 % of pollutants present in the concentrated stream. The developed model could successfully predict the plant performance as reflected in the very low relative error (0.01–0.12) and overall high correlation coefficient (R 2 > 0.96). Economic analysis indicated that such a membrane-integrated hybrid system could be quite promising in coke wastewater treatment at low cost i.e. $0.934/m2 of wastewater.
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Abbreviations
- c m,i :
-
Concentration in membrane of ion i (mol m−3)
- c m,i av :
-
Average concentration of ion i (mol m−3)
- C p,i :
-
Concentration in permeate of ion i (mol m−3)
- C f,i :
-
Feed concentration of ion i (mol m−3)
- D s,i :
-
Hindered diffusivity of ion i (m2 s−1) (D s,i = D B,i × K d,i)
- D B,i :
-
Bulk diffusivity of ion i (m2 s−1)
- d :
-
Thickness of oriented solvent layer (m)
- F:
-
Faraday constant
- J s,i :
-
Ion flux (mol m−2 s−1)
- J v :
-
Volumetric flux (m3 m−2 s−1)
- K c,i :
-
Hindrance factor for convection of ion i
- K d,i :
-
Hindrance factor for diffusion of ion i
- k :
-
Boltzmann constant, 1.38066 × 10−23 J K−1
- ∆P :
-
Applied pressure difference (KPa)
- ∆P T :
-
Effective pressure difference (Kpa)
- P ei :
-
Peclet number of ion i, dimensionless
- R j,i :
-
Rejection (%) of ion i
- r p :
-
Effective pore radius (nm)
- r s,i :
-
Solute radius of ion i (nm)
- R :
-
Universal gas constant (J mol−1 K−1)
- T :
-
Absolute temperature (K)
- ∆x m :
-
Effective membrane thickness (m)
- X d :
-
Effective charge membrane density (mol m−3)
- z i :
-
Valence of ion i
- η ws :
-
Dynamic viscosity of the wastewater (kg m−1 s−1)
- Φ i :
-
Steric coefficient of ion i
- λ i :
-
Ratio of solute radius to pore radius of ion i
- ∆Ψ s :
-
Donnan potential difference (V)
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Acknowledgments
Authors are thankful to the Department of Science and Technology, Government of India for financial support under Start-up research grant for young scientist (SERB) (SB/FTB/ETA-59/2013).
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Kumar, R., Chakrabortty, S. & Pal, P. Membrane-integrated physico-chemical treatment of coke-oven wastewater: transport modelling and economic evaluation. Environ Sci Pollut Res 22, 6010–6023 (2015). https://doi.org/10.1007/s11356-014-3787-6
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DOI: https://doi.org/10.1007/s11356-014-3787-6