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首页> 外文期刊>Journal of the air & waste management association >Optimizing chemical oxygen demand removal from synthesized wastewater containing lignin by catalytic wet-air oxidation over CuO/Al_2O_3 catalysts
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Optimizing chemical oxygen demand removal from synthesized wastewater containing lignin by catalytic wet-air oxidation over CuO/Al_2O_3 catalysts

机译：CuO / Al_2O_3催化剂上湿式催化氧化法优化含木质素合成废水中化学需氧量的去除

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摘要

In this study, 10% CuO/Al_2O_3 catalyst was used in a catalytic wet-air oxidation process to remove chemical oxygen demand (COD) and color from experimentally designed wastewater containing lignin. The catalyst was prepared using an impregnation method and was characterized by X-ray diffraction (XRD), atomic absorption spectroscopy (AAS), and Brunauer-Emmett-Teller method (BET) for surface area before use. A series of Box-Behnken design (BBD) experiments were used to identify the conditions (temperature, pressure, reaction time, and catalysts) necessary for the COD removal process. The predicted model had R~2 and K~2_(adj) correlation coefficients of 0.98 and 0.97, respectively. Pressure only and the interaction effect between temperature and pressure were found to have a significant effect on COD removal (both confidence interval [CI] 95%). Finally, response surface methodology (RSM)-optimized results suggested that 92% of COD could be removed in 1 L of experimental wastewater with a lignin concentration 350 mg/L in 120 min under the following conditions: a reaction temperature of 185 ℃, a pressure of 10 bars, and catalyst loading of 1 g/L. The experiment, performed in triplicate, yielded a COD removal of 90 ± 2%. The results are believed to be of importance to pulp and paper industrial wastewater treatment and other similar applications.
机译：在这项研究中，将10％CuO / Al_2O_3催化剂用于湿法催化氧化工艺中，以从实验设计的含木质素废水中去除化学需氧量（COD）和颜色。使用浸渍方法制备催化剂，并在使用前通过X射线衍射（XRD），原子吸收光谱法（AAS）和Brunauer-Emmett-Teller法（BET）表征表面积。一系列Box-Behnken设计（BBD）实验用于确定COD去除过程所需的条件（温度，压力，反应时间和催化剂）。预测模型的R〜2和K〜2_（adj）相关系数分别为0.98和0.97。发现仅压力以及温度和压力之间的相互作用对COD去除具有显着影响（置信区间[CI]为95％）。最后，通过响应面法（RSM）的优化结果表明，在以下条件下，在120分钟内1升木质素浓度为350 mg / L的实验废水中，可去除92％的COD：压力为10巴，催化剂负载量为1 g / L。一式三份地进行的实验产生了90±2％的COD去除率。相信该结果对于纸浆和造纸工业废水处理和其他类似应用很重要。

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    Pongsert Sriprom; Sutasinee Neramittagapong; Chitsan Lin; Kitirote Wantala; Arthit Neramittagapong; Nurak Grisdanurak;

  • 作者单位

    Department of Chemical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand;

    Department of Chemical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand,Khon Kaen University, Khon Kaen 40002, Thailand;

    Department of Marine Environmental Engineering, College of Ocean Engineering, National Kaohsiung Marine University, Kaohsiung, Taiwan;

    Department of Chemical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand;

    Department of Chemical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand;

    Department of Chemical Engineering, Faculty of Engineering, Thammasat University, Pathumthani, Thailand;

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