Evaluating the coagulant efficiency of functionalized magnetite nanoparticles in removing some pollutants from aquatic ecosystems
Mohammad Amin Ardalani
1
,
mehrdad cheraghi
2
1 - 1. M.Sc. Geaduated in Environmental Science, Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
2 - 2. Ph.D. in Environmental Science, Professor in Environmental Science, Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
Keywords: BOD, COD, Functionalized magnetite nanoparticles, Municipal wastewater, TDS,
Abstract :
Considering the importance of water in life as well as environmental issues, its purification is of particular importance. One of the most important methods of water and wastewater treatment is the coagulation of pollutants in water by coagulants. The aim of this study was to determine the efficiency of coagulation process to reduce biochemical oxygen demand (BOD), chemical oxygen demand (COD) and total soluble solids (TDS) using magnetite nanoparticles functionalized with 2,4-dinitrophenyl hydrazine as a coagulant. This study was an empirical investigation in which 2,4-dinitrophenylhydrazine functionalized magnetite nanoparticles were synthesized by co-precipitation method and were used as a coagulant for the removal of BOD, COD, and TDS from Hamedanmunicipal sewage. Nanoparticles were characterized using SEM, XRD, and FTIR methods. Experiments were conducted discontinuously and the variable effects such as pH (2-11), coagulation dose (10-80 mg), mixing time (2-60 min), and sedimentation time (10-50 min) on the efficacy of BOD, COD, and TDS removal were studied. SEM image showed that the 2,4-dinitrophenylhydrazine functionalized magnetite nanoparticles had spherical shapes with the size of 20-35 nm. The obtained results showed that with 20 min of mixing time, 60 mg/L of coagulant, 30 min of settling time and pH equal to 7, the removal efficiency of BOD, COD and TDS increased to 98%, 94% and 99.2%.2,4-dinitrophenylhydrazine functionalized magnetite nanoparticles can be used as an effective and available coagulant to remove BOD, COD and TDS from municipal wastewater.
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