Removal of Fe2+, Zn2+ and Mn2+ from the mining wastewater by lemon peel waste

Slađana Meseldžija, Jelena Petrović, Antonije Onjia, Tatjana Volkov-Husović, Aleksandra Nešić, Nikola Vukelić


This study is aimed to evaluate the possibility of lemon peel, as an agro-industrial waste, to remove Fe2+, Zn2+ and Mn2+ from single aqueous sol­u­ti­ons and mining wastewater. For this purpose, the influence of various para­me­ters: sorption time, initial pH solution, initial metal ion concentration and a dose of sorbent on the sorption process were studied in batch experiments. The experi­mental equilibrium data have been analysed utilizing linearized forms of Lang­muir, Freundlich, Temkin and Dubinin–Radushkevich isotherms. The Langmuir isotherm provided the best theoretical correlation of the experi­men­tal equilibrium data for Fe2+, Zn2+ and Mn2+, with the maximum sorption cap­acities of 4.40, 5.03 and 4.52 mg g-1, respectively.  The percentage of targeted ions removal from single aqueous solutions was 92.9 % (Zn2+), 84.5 % (Fe2+) and 78.2 % (Mn2+). Regarding the sorption capability of lemon peel in mining wastewater, the maxi­mum removal of Fe2+, Zn2+ and Mn2+ from mining waste­water was 49.62, 33.97 and 9.11 %, respectively. In addition, the potential reusability of the lemon peel as sorbent was investigated through desorption study in 0.1M of CH3COO4, HCl and HNO3 solution. The highest rate of desorption was achieved in 0.1 M HCl solution, reached a value of 55.19 % for Mn2+ and 37.24 % for Zn2+, while for Fe2+ the highest value of 25.82 % was achieved in 0.1M HNO3 solution.


sorption; citrus peel; biosorbent; wastewater


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