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首页> 外文期刊>Ecotoxicology and Environmental Safety >Effect of pyrolysis temperature on characteristics, chemical speciation and risk evaluation of heavy metals in biochar derived from textile dyeing sludge
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Effect of pyrolysis temperature on characteristics, chemical speciation and risk evaluation of heavy metals in biochar derived from textile dyeing sludge

机译：热解温度对纺织印染污泥生物炭中重金属的特性，化学形态和风险评估的影响

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摘要

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.
机译：纺织品染色污泥（TDS）在300至700摄氏度的温度范围内热解，以研究特性并评估源自TDS的生物炭中重金属（锌，铜，铬，镍，镉和锰）的风险。重金属的特征分析和潜在环境风险评估通过BET-N-2，FTIR和BCR顺序萃取程序进行。结果表明，随着热解温度的升高，TDS的热解处理有助于pH值和比表面积的提高。 TDS转化为生物炭显着降低了H / C和O / C比，导致TDS衍生的生物炭具有更强的碳化和更高的芳族缩合。 TDS中有机物的热分解使生物炭中Zn，Cu，Cr，Ni和Mn的总含量随着热解温度的增加而增加。但对于Cd，当温度升高到600摄氏度时，分布在生物炭中的部分明显减少。但是，使用BCR顺序萃取程序和分析发现，热解过程促进了化学形态和生物炭基质特性的变化，导致以减少生物炭中重金属的生物利用率。重金属的潜在环境风险从TDS中的可观风险降低到400摄氏度以上热解后的生物炭低风险或无生物炭风险。这项工作表明，热解工艺是处置TDS并具有可接受的环境风险的一种有前途的方法。

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