Abstract
Treatment of Pb-Zn smelter wastewater via complexation-ultrafiltration (C-UF) was studied using copolymer of acrylic acid-maleic acid (PMA) as complexant. The complexing reaction kinetics of M (Cd(II), Pb(II) and Zn(II)) with PMA were examined for the first time and the pseudo-first-order model could be employed to simulate the reaction. The effects of the mass ratio of PMA to metal ions (P/M) and pH on the simultaneous removal of Cd(II), Zn(II) and Pb(II) via C-UF were investigated, and the optimized P/M and pH are 10 and 7.0, respectively. Furthermore, the shear stability of PMA-Cd, PMA-Zn and PMA-Pb complexes was investigated, and the corresponding critical shear rates (γc), the smallest shear rate at which the complexes begin to dissociate were 1.98×105, 1.81×104 and 1.38×105 s−1, respectively. The selective recovery of Cd(II), Zn(II) and Pb(II) from Pb-Zn Smelter wastewater as well as the regeneration of PMA were fulfilled by shear induced dissociation coupled with ultrafiltration (SID-UF) according to the difference of critical shear rates of PMA-M complexes, and the regenerated PMA showed almost the same complexation ability as the original.
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Abbreviations
- C0 :
-
metal concentration of the permeate at rest [mg L−1]
- Cf :
-
metal concentration of the feed [mg L−1]
- C H+ :
-
H+ concentration [mg L−1]
- CM :
-
metal concentration ratio of the permeate to the initial feed
- CPMA :
-
PMA concentration [mg L−1]
- Cp :
-
metal concentration of the permeate [mg L−1]
- CR :
-
metal concentration ratio of retentate to the initial feed
- C com :
-
metal concentration of the permeate through the complexation region [mg L−1]
- Cdis :
-
metal concentration of the permeate through the dissociation region [mg L−1]
- F:
-
permeation coefficient [L m−2 kPa−1 h−1, m s−1 Pa−1]
- K:
-
rate constant
- K1 :
-
pseudo-first-order rate constant
- K*:
-
observed rate constant
- k:
-
velocity following factor
- N:
-
rotation speed [rpm]
- Nc :
-
critical rotation speed [rpm]
- P0 :
-
center pressure [kPa]
- r0 :
-
membrane outsider radius [m]
- ri :
-
membrane insider radius [m]
- rc :
-
critical radius [m]
- R:
-
rejection of metal [%]
- R2 :
-
regression coefficient
- t:
-
time [s]
- VR :
-
the volume ratio of supplementar y deionized water to the initial feed
- v :
-
kinematic viscosity [m2s−1 ]
- ρ :
-
fluid density [kg m−3]
- γ :
-
shear rate [s−1]
- γ c :
-
critical shear rate [s−1]
- γcl, γct :
-
critical shear rate on membrane surface in the laminar regime and turbulent regime [s−1]
- β :
-
selective separation factor
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Acknowledgement
This work was supported by the National Natural Science Foundation of China (No. 21476265).
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Le, HS., Qiu, YR. Selective separation of Cd(II), Zn(II) and Pb(II) from Pb-Zn smelter wastewater via shear induced dissociation coupling with ultrafiltration. Korean J. Chem. Eng. 37, 784–791 (2020). https://doi.org/10.1007/s11814-020-0509-2
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DOI: https://doi.org/10.1007/s11814-020-0509-2