Department of Chemistry, K. S. Rangasamy College of Technology, Namakkal, Tamil Nadu, India.
Department of Food Technology, Kongu Engineering College, Perundurai, Tamil Nadu, India.
Water Environ Res. 2023 Mar;95(3):e10851. doi: 10.1002/wer.10851.
The present work investigated the feasibility of photo-oxidation process for the removal of oil and chemical oxygen demand (COD) in Indian tannery wastewater with the support of mathematical modeling and statistical approach. The influence of process variables such as nano-catalyst dose and reaction time was analyzed on the removal of oil/grease and COD. The obtained results are discussed using the response surface methodology (RSM) design in detail. Zinc oxide nanoparticles prepared from Eclipta prostrata plant leaves and characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX), and transmission electron microscopy (TEM). COD removal of 93.6% and oil and grease removal of 90% in 35 min using 3 mg/L nanoparticle dosage were recommended as an optimum condition in photo-oxidation process. PRACTITIONER POINTS: The structure and surface morphology of zinc oxide nanoparticles in spherical shape was confirmed by the SEM with EDX and XRD analysis. Response surface methodology (RSM) with Box-Behnken design (BBD) combination was explained the effect of different parameters on COD and oil and grease removal. The treatment of photo-oxidation process showed chemical oxygen demand (COD) removal of 93.6% and coil and grease removal of 90% in 35 min using mg/L nanoparticle dosage. The obtained result showed that photo oxidation of green synthesized zinc oxide nanocatalyst was found to be an effective method for tannery wastewater.
本研究旨在利用数学建模和统计方法，探讨光氧化法去除印度制革废水中油类和化学需氧量（COD）的可行性。分析了纳米催化剂剂量和反应时间等工艺变量对去除油/脂和 COD 的影响。详细讨论了利用响应面法（RSM）设计得到的结果。利用 Eclipta prostrata 植物叶片制备的氧化锌纳米粒子，并通过傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、扫描电子显微镜（SEM）和能量色散 X 射线分析（EDX）以及透射电子显微镜（TEM）进行了表征。推荐在光氧化工艺中，使用 3mg/L 的纳米粒子剂量，在 35 分钟内可达到 93.6%的 COD 去除率和 90%的油/脂去除率作为最佳条件。
通过 SEM 和 EDX 以及 XRD 分析，确认了氧化锌纳米粒子的球形结构和表面形态。
解释了响应面法（RSM）与 Box-Behnken 设计（BBD）组合对 COD 和油/脂去除的不同参数的影响。
光氧化处理工艺在 35 分钟内，使用 mg/L 的纳米粒子剂量，可达到 93.6%的 COD 去除率和 90%的油/脂去除率。
结果表明，绿色合成的氧化锌纳米催化剂的光氧化是一种有效的制革废水处理方法。
