Perveen Shazia, Hussain Syed Ghazanfar, Ahmed Muzamil Jalil, Khawar Ruba, Siraj Taha Bin, Saleem Maryam
Department of Chemistry, NED University of Engineering & Technology, University Road, Karachi 75270, Sindh, Pakistan.
Heliyon. 2023 Jul 17;9(8):e18344. doi: 10.1016/j.heliyon.2023.e18344. eCollection 2023 Aug.
This study provides techno-economical insights for acid regeneration and metal recovery from spent acidic wastewater by a diffusion dialysis plate-and-frame module using Quaternized Polyepichlorohydrin - Polyacrylonitrile (QPECH-PAN) membranes. Quaternized Polyepichlorohydrin (QPECH) membranes were synthesized using 1,4-diazobicyclo[2.2.2]octane (DABCO) and blended with polyacrylonitrile (PAN). Said membranes were analyzed in terms of their mechanical, physicochemical, and electrochemical characteristics, providing significant results comparable to the commercial membranes (IEC: 1.76 mmol/g, SD: 60.91%, Permselectivity: 79.5 ± 0.31%, and transport no. t: 0.5). Mechanical characterization reveals that the QPECH-PAN membranes possess comparable mechanical strengths (tensile strength: 329.56 MPa). Further, sheet resistivity (6.11 Ω cm) and conductivity (0.16 S/cm) reveal the relative conductive nature of these membranes. Percent acid recovery and metal ion recovery ratios were found to be 72% and 48% respectively, and separation factors were 126.8 and 84.57 respectively. The QPECH-PAN membrane's techno-economic feasibility was also analyzed within the context of a textile industry processing up to 5500 kg/d of acidic wastewater. It indicates a potential cost saving of US $0.53 million on HSO and NaOH, as well as an OPEX saving of 40.91% against a semi-continuous acid neutralizer.
本研究通过使用季铵化聚环氧氯丙烷-聚丙烯腈（QPECH-PAN）膜的扩散渗析板框模块，为从废酸性废水中进行酸再生和金属回收提供了技术经济见解。使用1,4-二氮杂双环[2.2.2]辛烷（DABCO）合成了季铵化聚环氧氯丙烷（QPECH）膜，并与聚丙烯腈（PAN）共混。对所述膜的机械、物理化学和电化学特性进行了分析，得到了与商业膜相当的显著结果（离子交换容量：1.76 mmol/g，标准偏差：60.91%，渗透选择性：79.5±0.31%，传输数t：0.5）。机械特性表明，QPECH-PAN膜具有相当的机械强度（拉伸强度：329.56 MPa）。此外，表面电阻率（6.11Ω·cm）和电导率（0.16 S/cm）揭示了这些膜的相对导电性质。酸回收率和金属离子回收率分别为72%和48%，分离因子分别为126.8和84.57。还在纺织工业处理高达5500 kg/d酸性废水的背景下分析了QPECH-PAN膜的技术经济可行性。结果表明，在硫酸和氢氧化钠方面可节省潜在成本53万美元，与半连续酸中和器相比，运营成本节省40.91%。
