Co-Pyrolysis of Textile Dyeing Sludge/Litchi Shell and Cao: Immobilization of Heavy Metals and the Analysis of the Mechanism

To relieve the secondary contamination of heavy metals (HMs), the synergistic effect of co-pyrolysis of textile dyeing sludge (DS)/litchi shell (LS) and CaO on the migration of HMs was demonstrated in this study. The proportions of Cu, Zn, Cr, Mn, and Ni in the F4 fraction increased to 75%, 55%, 100%, 50%, and 62% at the suitable CaO dosages. When 10% CaO was added, the RI value of DLC-10% was reduced to 7.89, indicating low environmental risk. The characterizations of the physicochemical properties of biochar provided support for the HMs immobilization mechanism. HMs combined with inorganic minerals or functional groups to form new stable HMs crystalline minerals and complexes to achieve immobilization of HMs. The pH value and pore structure also play an important role in improving the immobilization performance of HMs. In conclusion, the results provided a new direction for the subsequent harmless treatment of HMs-enriched waste.

Keywords: Co-pyrolysis, Textile dyeing sludge, Litchi shell, Biochar, CaO activation

Suggested Citation: Suggested Citation

Li, Danni and Shan, Rui and Gu, Jing and Zhang, Yuyuan and Zeng, Xianhai and Lin, Lu and Yuan, Haoran and Chen, Yong, Co-Pyrolysis of Textile Dyeing Sludge/Litchi Shell and Cao: Immobilization of Heavy Metals and the Analysis of the Mechanism. Available at SSRN: https://ssrn.com/abstract=4272528 or http://dx.doi.org/10.2139/ssrn.4272528