Membrane-integrated physico-chemical treatment of coke-oven wastewater: transport modelling and economic evaluation.
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 × 10(2) 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/m(2) of wastewater.
Environment and Membrane Technology laboratory, Chemical Engineering Department, National Institute of Technology Durgapur, Mahatma Gandhi Avenue, Durgapur, West Bengal, 713209, India, rameshibt@gmail.com.
Ramesh
R
Kumar
Sankha
S
Chakrabortty
Parimal
P
Pal
D003077:Coke; D003362:Cost-Benefit Analysis; D003486:Cyanides / Q000302:isolation & purification*; D006861:Hydrogen Peroxide; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis*; D007501:Iron; D017616:Magnesium Compounds / Q000302:isolation & purification*; D008567:Membranes, Artificial; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry; D010636:Phenols / Q000302:isolation & purification*; D010710:Phosphates / Q000302:isolation & purification*; D016062:Porosity; D000069877:Struvite; D062065:Wastewater / Q000032:analysis*; D018508:Water Purification / Q000191:economics
D003077:Coke; D003486:Cyanides; D006861:Hydrogen Peroxide; D007220:Industrial Waste; D007501:Iron; D017616:Magnesium Compounds; D008567:Membranes, Artificial; D010636:Phenols; D010710:Phosphates; D000069877:Struvite; D062065:Wastewater; C045076:Fenton's reagent