期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 168, 期 -, 页码 45-52出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2018.10.022
关键词
Pyrolysis; Biochar; Heavy metals; Chemical speciation; Textile dyeing sludge
资金
- China-Japan Research Cooperative Program [2016YFE0118000]
- National Natural Science Foundation of China [41373092]
- Scientific and Technological Major Special Project of Tianjin City [16YEXTSF00420]
- Key Project of Young Talents Frontier of IUE, CAS [IUEQN201501]
Textile dyeing sludge (TDS) was pyrolyzed at temperature ranging from 300 to 700 degrees C to investigate characteristics and to evaluate the risk of heavy metals (Zn, Cu, Cr, Ni, Cd, and Mn) in biochar derived from the TDS. The analyzation of characteristics and potential environmental risk evaluation of heavy metals were conducted by the BET-N-2, FTIR, and BCR sequential extraction procedure. The results showed that the pyrolysis treatment of the TDS contributed to the improvement of the pH value and specific surface areas with increasing pyrolysis temperature. Conversion of the TDS to biochar significantly decreased the H/C and O/C ratios, resulting in a far stronger carbonization and a higher aromatic condensation for the TDS derived biochar. The total contents of Zn, Cu, Cr, Ni and Mn in biochar increased with pyrolysis temperature owing to the thermal decomposition of organic matter in the TDS; but for Cd, the portion distributed in the biochars decreased significantly when the temperature increased up to 600 degrees C. However, using BCR sequential extraction procedure and analysis, it was found that pyrolysis process promoted changes in the chemical speciation and biochar matrix characteristics, leading to reduce bio-available fractions of heavy metals in the biochars. The potential environmental risk of heavy metals decreased from considerable risk in the TDS to low risk or no risk in biochar after pyrolysis above 400 degrees C. This work demonstrated that the pyrolysis process was a promising method for disposing of the TDS with acceptable environment risk.
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