鸡粪和水洗猪粪热解生物炭中重金属的形态和环境风险。
Speciation and environmental risk of heavy metals in biochars produced by pyrolysis of chicken manure and water-washed swine manure.
机构信息
College of Resources and Environment, Hunan Agricultural University, Changsha, Hunan, 410128, People's Republic of China.
Key Laboratory for Rural Ecosystem Health in Dongting Lake Area of Hunan Province, Changsha, 410128, People's Republic of China.
出版信息
Sci Rep. 2021 Jun 7;11(1):11994. doi: 10.1038/s41598-021-91440-8.
This study was conducted to investigate the speciation, bioavailability and environmental risk of heavy metals (HMs) in chicken manure (CM) and water-washed swine manure (WSM) and their biochars produced at different pyrolysis temperatures (200 to 800 °C). As the pyrolysis temperature increased, the remaining proportion, toxicity characteristic leaching procedure (TCLP), HCl and diethylenetriamine pentaacetic acid (DTPA) of HMs gradually declined. This result proved that the speciation of HMs in chicken manure biochars (CMB) and water-washed swine manure biochars (WSMB) was influenced by pyrolysis temperature. The proportions of stable fractions were enhanced with increased pyrolysis temperature and weakened the HM validity for vegetation at 800 °C. Finally, the results of the risk assessment showed that the environmental risk of HMs in CMB and WSMB decreased with increasing pyrolysis temperature. Therefore, pyrolysis at 800 °C can provide a practical approach to lessen the initial and underlying heavy metal toxicity of CMB and WSMB to the environment.
本研究旨在调查鸡粪（CM）和水洗猪粪（WSM）及其在不同热解温度（200 至 800°C）下产生的生物炭中重金属（HMs）的形态、生物有效性和环境风险。随着热解温度的升高，重金属的残留比例、毒性特征浸出程序（TCLP）、HCl 和二乙三胺五乙酸（DTPA）逐渐降低。这一结果证明了鸡粪生物炭（CMB）和水洗猪粪生物炭（WSMB）中重金属的形态受热解温度的影响。稳定分数的比例随着热解温度的升高而增加，从而削弱了 800°C 时重金属对植被的有效性。最后，风险评估的结果表明，随着热解温度的升高，CMB 和 WSMB 中重金属的环境风险降低。因此，800°C 的热解可以为减轻 CMB 和 WSMB 对环境的初始和潜在重金属毒性提供一种实用方法。
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