Hussein Rim A
Environmental Health Department, High Institute of Public Health, Alexandria University, Alexandria, Egypt.
J Egypt Public Health Assoc. 2014 Dec;89(3):154-8. doi: 10.1097/01.EPX.0000457046.78389.33.
Wastewater discharged from electroplating industry contains different concentrations of heavy metals, which when released into the environment pose a health hazard to human beings.
The aim of this study was to assess the effectiveness of orange peel as an adsorbent in the recovery of Nickel (Ni) from electroplating wastewater.
The effectiveness of orange peel as an adsorbent was assessed by determining the optimum conditions of adsorption (adsorbent dose, pH, and contact time), calculating the recovery percentage, and characterizing the orange peel sludge resulting from adsorption/desorption process as being hazardous or not.
Under optimum conditions for adsorption, orange peel was found to be an effective adsorbent of Ni from electroplating wastewater. It achieved 59.28% removal of the metal from a solution containing 528 mg/l, at a dose of 60 g/l, at pH 7, and for 1-h contact time. The nickel uptake capacity of orange peel was calculated to be 5.2 mg/g. Using HCl for desorption of adsorbed Ni, a recovery of 44.46% of Ni discharged in the wastewater could be reached. Orange peel resulting from the adsorption/desorption process was characterized as being nonhazardous.
Orange peel was found to be effective in the recovery of nearly half of the amount of Ni discharged in electroplating wastewater. Further studies are required to determine (a) the impact of the recovered NiCl2 solution on the quality of the plated product, (b) the effect of activation of orange peel on the adsorption process, and (c) the number of cycles during which orange peel can be reused as an effective adsorbent.
电镀行业排放的废水含有不同浓度的重金属，这些重金属一旦释放到环境中，会对人类健康构成危害。
本研究旨在评估橙皮作为吸附剂从电镀废水中回收镍（Ni）的效果。
通过确定吸附的最佳条件（吸附剂剂量、pH值和接触时间）、计算回收率以及对吸附/解吸过程产生的橙皮污泥是否具有危险性进行表征，来评估橙皮作为吸附剂的效果。
在最佳吸附条件下，发现橙皮是电镀废水中镍的有效吸附剂。在剂量为60 g/l、pH值为7且接触时间为1小时的情况下，它能从含528 mg/l的溶液中去除59.28%的金属。计算得出橙皮对镍的吸附容量为5.2 mg/g。使用盐酸解吸吸附的镍，可实现废水中排放的镍回收率达到44.46%。吸附/解吸过程产生的橙皮被表征为无危险性。
发现橙皮在回收电镀废水中近一半排放的镍量方面是有效的。需要进一步研究以确定：（a）回收的NiCl2溶液对电镀产品质量的影响；（b）橙皮活化对吸附过程的影响；（c）橙皮作为有效吸附剂可重复使用的循环次数。
