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Combined performance of biochar sorption and magnetic separation processes for treatment of chromium-contained electroplating wastewater

2014; Elsevier BV; Volume: 174; Linguagem: Inglês

10.1016/j.biortech.2014.10.007

1873-2976

Shengye Wang, Yankui Tang, Li Kun, Yayuan Mo, Hao-Feng Li, Zhan-qi Gu,

Minerals Flotation and Separation Techniques

Magnetic biochar was prepared with eucalyptus leaf residue remained after essential oil being extracted. Batch experiments were conducted to examine the capacity of the magnetic biochar to remove Cr (VI) from electroplating wastewater and to be separated by an external magnetic field. The results show that the initial solution pH plays an important role on both sorption and separation. The removal rates of Cr (VI), total Cr, Cu (II), and Ni (II) were 97.11%, 97.63%, 100% and 100%, respectively. The turbidity of the sorption-treated solution was reduced to 21.8NTU from 4075NTU after 10min magnetic separation. The study also confirms that the magnetic biochar still retains the original magnetic separation performance after the sorption process.