Sibiya Nomthandazo Precious, Amo-Duodu Gloria, Tetteh Emmanuel Kweinor, Rathilal Sudesh
Green Engineering Research Group, Department of Chemical Engineering, Faculty of Engineering and The Built Environment, Durban University of Technology, Durban 4001, South Africa.
Polymers (Basel). 2022 Oct 15;14(20):4342. doi: 10.3390/polym14204342.
Coagulation with synthetic chemicals has been used to treat a wide range of industrial effluents. Herein, the unique characteristics of industrial effluents being detrimental to the environment warrants urgent resource-efficient and eco-friendly solutions. Therefore, the study investigated the use of two magnetized coagulants (chitosan magnetite (CF) and rice starch magnetite (RF)), prepared via co-precipitation in three different ratios (1:2, 1:1 and 2:1) of natural coagulants (chitosan or rice starch) and magnetite nanoparticles (F) as alternative coagulants to alum for the treatment of wastewater. A Brunauer-Emmett-Teller (BET) analyzer, an X-ray diffraction (XRD) analyzer, and energy-dispersive X-ray (EDX) spectroscopy were used to characterize the surface area, crystal structure, and elemental composition of the coagulants. The influences of settling time (10-60 min) on the reduction of turbidity, color, phosphate, and absorbance were studied. This was carried out with a jar test coupled with six beakers operated under coagulation conditions of rapid stirring (150 rpm) and gentle stirring (30 rpm). Wastewater with an initial concentration of 45.6 NTU turbidity, 315 Pt. Co color, 1.18 mg/L phosphate, 352 mg/L chemical oxygen demand (COD), and 73.4% absorbance was used. The RF with a ratio of 1:1 was found to be the best magnetized coagulant with over 80% contaminant removal and 90% absorbance. The treatability performance of RF (1:1) has clearly demonstrated that it is feasible for wastewater treatment.
使用合成化学药剂进行混凝已被用于处理各种工业废水。在此，工业废水对环境有害的独特特性需要紧急的资源高效且环保的解决方案。因此，本研究调查了通过共沉淀法制备的两种磁化混凝剂（壳聚糖磁铁矿（CF）和大米淀粉磁铁矿（RF）），它们由天然混凝剂（壳聚糖或大米淀粉）和磁铁矿纳米颗粒（F）按三种不同比例（1:2、1:1和2:1）制成，作为替代明矾的混凝剂用于废水处理。使用布鲁瑙尔-埃米特-泰勒（BET）分析仪、X射线衍射（XRD）分析仪和能量色散X射线（EDX）光谱对混凝剂的表面积、晶体结构和元素组成进行表征。研究了沉降时间（10 - 60分钟）对浊度、颜色、磷酸盐和吸光度降低的影响。这是通过在六个烧杯中进行的烧杯试验来完成的，试验在快速搅拌（150转/分钟）和缓慢搅拌（30转/分钟）的混凝条件下进行。使用了初始浓度为45.6 NTU浊度、315 Pt. Co颜色、1.18毫克/升磷酸盐、352毫克/升化学需氧量（COD）和73.4%吸光度的废水。发现比例为1:1的RF是最佳的磁化混凝剂，对污染物的去除率超过80%，吸光度去除率达90%。RF（1:1）的可处理性能清楚地表明其用于废水处理是可行的。
