Laboratory of Treatment and Valorization of Water Rejects, Water Researches and Technologies Center, Borj-Cedria Technopark, University of Carthage, 8020, Soliman, Tunisia.
Laboratory of advanced Materials, National School of Engineers of Sfax, University of Sfax, 3038, Sfax, Tunisia.
J Hazard Mater. 2020 Jan 15;382:121119. doi: 10.1016/j.jhazmat.2019.121119. Epub 2019 Aug 29.
This study investigates the performance of the combination of biological pre-treatment with Kefir grains (KGs) and photocatalytic process using Ag-doped TiO nanoparticles (NPs) for the simultaneous removal of toxic pollutants from landfill leachate (LFL). After 5 days of 1% (w/v) KGs pre-treatment at 37 °C, TOC, COD, NH-N, and PO removal rates were 93, 83.33, 70 and 88.25%, respectively. The removal efficiencies were found to be 100, 94, 62.5, 53.16 and 47.52 % for Cd, Ni, Zn, Mn and Cu, respectively. The optimal conditions of Ag-doped TiO photocatalytic process were optimized using Box-Behnken design and response surface methodology (BBD-RSM) to enhance the quality of pre-treated LFL. Interestingly, Ag-doped TiO photocatalytic process increases the overall removal efficiencies to 98, 96, 85 and 93% of TOC, COD, NH-N, and PO, respectively. Furthermore, the removal efficiency of toxic heavy metals was gradually improved. In addition, KGs and Ag-doped TiO exhibited excellent recyclability showing the potential of combined biological/photocatalytic process to treat hazardous LFL.
本研究考察了生物预处理与 Kefir 粒（KGs）结合并用掺银 TiO2 纳米颗粒（NPs）进行光催化处理，同时从垃圾渗滤液（LFL）中去除有毒污染物的效果。在 37°C 下进行 1%（w/v）KGs 预处理 5 天后，TOC、COD、NH-N 和 PO 的去除率分别达到 93%、83.33%、70%和 88.25%。Cd、Ni、Zn、Mn 和 Cu 的去除效率分别达到 100%、94%、62.5%、53.16%和 47.52%。采用 Box-Behnken 设计和响应面法（BBD-RSM）优化掺银 TiO 光催化工艺的最佳条件，以提高预处理 LFL 的质量。有趣的是，掺银 TiO 光催化处理将 TOC、COD、NH-N 和 PO 的总去除效率分别提高到 98%、96%、85%和 93%。此外，有毒重金属的去除效率逐渐提高。此外，KGs 和掺银 TiO2 表现出优异的可循环性，表明联合生物/光催化工艺处理危险 LFL 的潜力。
