Abstract
Abstract The selective separation of Mn(II) and Cd(II) as well as regeneration of the complexing agent were conducted by shear induced dissociation coupling with ultrafiltration (SID-UF), and the copolymer of maleic acid and acrylic acid (PMA) was used as complexing agent. At the optimal complexation conditions, pH 6 and P/M (mass ratio of polymer to metal ions) 9, both the rejections of Mn(II) and Cd(II) arrived at more than 99%. The shear stabilities of two PMA-metal complexes at different pHs were particularly investigated using rotating disk membrane and the results indicated that critical shear rates γ c of PMA-Mn complex were lower than that of PMA-Cd at the same pH. According to the difference of the shear stabilities between PMA-Mn and PMA-Cd complexes, the selective separation of Mn(II) and Cd(II) were achieved by SID-UF at 1450 rpm and 1600 rpm, and PMA was regenerated.
Highlights
Wastewater containing Mn(II) and Cd(II) originated from manganese mining exploration generally has a low pH (1~3) and involves multiple ingredients such as various organic or inorganic agents, a large amount of suspended substances and other metal ions, which produce a marked impact on the surrounding ecological environment and agricultural production
The present study mainly investigated the shear stability of PMA-Mn and PMA-Cd complex as well as selective separation of Mn(II) and Cd(II) in a shear enhanced polymer-assisted ultrafiltration (PAUF) system equipped with a rotating disk membrane (RDM) module
The corresponding critical shear rates γc of PMA-Mn and PMA-Cd complexes at three pHs were obtained and results revealed that the structure of PMA-Cd complex was relatively more stable than PMA-Mn complex
Summary
Wastewater containing Mn(II) and Cd(II) originated from manganese mining exploration generally has a low pH (1~3) and involves multiple ingredients such as various organic or inorganic agents, a large amount of suspended substances and other metal ions, which produce a marked impact on the surrounding ecological environment and agricultural production. Excessive intake of this polluted water can cause metal poisoning or even irreversibly harm the human nervous system as well (Sharma, et al, 2007). Owing to the high separation selectivity, high removal efficiency and low energy requirements (Juang and Chiou, 2000; Qiu and Mao, 2013), PAUF has applicability in many areas involving the removal/
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
