Adsorption-pyrolysis technology for recovering heavy metals in solution using contaminated biomass phytoremediation

作者：Han, Ziyu; Guo, Zhaohui^*; Zhang, Yong; Xiao, Xiyuan; Xu, Zhi; Sun, Yang

来源：Resources, Conservation and Recycling, 2018, 129: 20-26.

DOI：10.1016/j.resconrec.2017.10.003

• Phytoremediating biomass
• Adsorption
• Pyrolysis
• Cadmium
• Copper
• Bio-ore

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 30 min adsorption was 2.7 wt% and 1.25 wt%. Next, the saturated biomass is pyrolyzed at 450 degrees C, and the final content of Cd and Cu in the solid phase product was 7.13 wt% and 6.58 wt%, 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.

• 出版日期2018-2
• 单位中南大学