Lissaneddine Amina, Aziz Khalid, Ouazzani Naaila, El Achaby Mounir, Haydari Imane, Mandi Laila, Aziz Faissal
National Center for Research and Studies On Water and Energy (CNEREE), Cadi Ayyad University, B. 511, 40000 Marrakech, Morocco.
Laboratory of Water, Biodiversity, and Climate Change, Faculty of Sciences Semlalia, Cadi Ayyad University, B.P. 2390, 40000 Marrakech, Morocco.
J Environ Health Sci Eng. 2023 Sep 12;21(2):513-532. doi: 10.1007/s40201-023-00878-7. eCollection 2023 Dec.
This present study depicts the successful employment of fixed-bed column for total chromium removal from tannery wastewater in dynamic mode using sodium alginate-powdered marble beads (SA-Marble) as adsorbent. The SA-Marble composite beads prepared were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and Brunauer, Emmett and Teller (BET) method. The adsorption process performance of this bio-sorbent was examined in batches and columns for real effluent (tannery wastewater). After 90 min, the total chromium removal efficiency could be kept above 90% in the batch experiment. The adsorption kinetics fit better with the pseudo-second-order model, indicating the chemisorption process and the adsorption capacity of about 67.74 mg g at 293 K (C0 = 7100 mg L) was obtained. Additionally, dynamic experiments indicate that the total chromium removal efficiency could be maintained above 90% after 120 min at 293 K and 60 min at 318 and 333 K; it's an endothermic but rapid process. The effects of two adsorption variables (Temperature and time) were investigated using central composite design (CCD), which is a subset of response surface methodology (total Cr, COD, sulfate, and total phosphorus percentage removal). This work paves a new avenue for synthesizing SA-Marble composite beads and provides an adsorption efficiency of total chromium removal from tannery wastewater.
本研究描述了使用海藻酸钠-大理石粉末珠（SA-大理石）作为吸附剂，以动态模式在固定床柱中从制革废水中去除总铬的成功应用。制备的SA-大理石复合珠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）、能量色散X射线光谱（EDS）和布鲁诺尔、埃米特和泰勒（BET）方法进行了表征。在批次实验和柱实验中，对这种生物吸附剂对实际废水（制革废水）的吸附过程性能进行了研究。在批次实验中，90分钟后，总铬去除效率可保持在90%以上。吸附动力学更符合准二级模型，表明是化学吸附过程，在293K（C0 = 7100mg/L）时获得了约67.74mg/g的吸附容量。此外，动态实验表明，在293K下120分钟后以及在318K和333K下60分钟后，总铬去除效率可保持在90%以上；这是一个吸热但快速的过程。使用中心复合设计（CCD）研究了两个吸附变量（温度和时间）的影响，中心复合设计是响应面方法的一个子集（总铬、化学需氧量、硫酸盐和总磷去除率）。这项工作为合成SA-大理石复合珠开辟了一条新途径，并提供了从制革废水中去除总铬的吸附效率。
