Adsorption-pyrolysis technology for recovering heavy metals in solution using contaminated biomass phytoremediation
2017
Ziyu, Han | Zhaohui, Guo | Yong, Zhang | Xiyuan, Xiao | Zhi, Xu | Yang, Sun
Feasibility of adsorption-pyrolysis technology to recover metals from solution using contaminated biomass phytoremediation was discussed. The technology can meet three objectives: the disposal of metals-contaminated biomass from phytoremediation, the adsorption of metals from wastewater and the reuse of metals-saturated biomass. In this study, the recovery of Cd and Cu in metals-containing solution from contaminated biomass of phytoremediation was achieved through adsorption and pyrolysis technology. The results showed that pH value of the metals-containing solution and the pyrolysis temperature for metals concentration are the key factors of the novel technology. When the pH of the metals-containing solution was 6, the content of Cd and Cu in the saturated biomass after approximately 30min adsorption was 2.7wt% and 1.25wt%. Next, the saturated biomass is pyrolyzed at 450°C, and the final content of Cd and Cu in the solid phase product was 7.13wt% and 6.58wt%, respectively. The concentration of metals from the adsorption-pyrolysis process for bio-ore was primarily due to the redox reaction of Cd and Cu salts and the volatilizing properties of elements. The results suggested that the adsorption-pyrolysis technology is feasible for recovery of Cd and Cu in solution.
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