Carbon Loss During Preparation and Aging of Sludge Livestock Manure Biochars

被引：1
|
作者：
Zhang Y. [1 ]
Zhang C.-H. [1 ]
Zhang X.-F. [1 ]
Duan W.-Y. [1 ]
Chen F.-Y. [1 ]
机构：
[1] Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming
来源：
Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 08期
关键词：
biochar; carbon loss; carbon stability; fowl dung; inherent minerals; sludge;
D O I：
10.13227/j.hjkx.202209008
中图分类号：
学科分类号：
摘要：
Biochar has high carbon stability and is a good carbon sequestration material. Sludge biochar is rich in inorganic minerals, which would provide enrichment in the preparation process of pyrolysis, affecting its carbon sequestration capacity in practice. In this study, municipal sludge biochar (SZB), pharmaceutical sludge biochar (YCB), and chicken manure biochar (JFB) were prepared under the pyrolysis process at 500, 600, and 700℃, respectively, and their aging process in soil for 70-100 years was simulated. The physicochemical properties and the carbon loss calculation of the biochars were determined using elemental analysis, FTIR, XRF, ICP, and XRD. The results demonstrated that the type and mass fraction of endogenous minerals in the biochars determined their carbon loss during pyrolysis. Ca and Mg were the main carbon-protecting minerals, whereas Fe may have reduced the carbon stability of the sludge biochars and therefore increased the carbon loss. For the aging process, the stability of the endogenous carbon in the biochars played a major role in its carbon loss, whereas the endogenous minerals played a supporting role. These findings elucidated the effect of the stability of endogenous carbon and the composition of mineral components on the carbon loss of biochars, which may provide references for soil carbon sequestration using sludge and chicken manure biochar. © 2023 Science Press. All rights reserved.
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页码：4554 / 4564
页数：10
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