化工进展2019，Vol.38Issue(3)：1545-1551,7.DOI:10.16085/j.issn.1000-6613.2018-1011
炭化工艺对脱水沼渣炭理化性质的影响
Effect of carbonization process on physiochemical properties of digestate
摘要
Abstract
The digestate after the first-stage dehydration was used as the raw material in this study. Its weight loss behavior and the compositions of the pyrolysis gas products were analyzed by thermogravimetry-Fourier Transform infrared spectroscopy (TG-FTIR). The single-factor test method was used to investigate the effects of carbonization temperature, heating rate and holding time on the yields and physiochemical properties of biochar. The results showed that the pyrolysis reactions mainly took place at the temperature range of 360-480℃. The yield and volatile content of biochar gradually decreased with the increase of pyrolysis temperature, while its ash content increased correspondingly. The highest content (18.37％) of fixed carbon in char was obtained at 700℃. The increase of heating rate had led to the increase in the contents of ash and fixed carbon in biochar, as well as result in the reduction in char yield and volatile content in biochar. In the meantime, the yield of biochar decreased gradually with the increase of holding time. The effect of holding time on the contents of ash, volatile and fixed carbon in biochar was insignificant. The calorific values of raw material and biochar were all low. The contents of heavy metals Cd and Pb in the produced biochar were lower than those indicated in the standard of "Organic/inorganic compound fertilizer " (GB18877-2009). Hg and Cr contents in the biochars were low, which was within the limits of harmful heavy metal elements in fertilizers. On the other hand, the contents of elements of Mn and Zn that are beneficial to plant growth were high. This study provides a theoretical basis for using the digestate as raw materials to produce fertilizers.关键词
脱水沼渣/热解/炭化工艺/得炭率/重金属Key words
digestate/pyrolysis/carbonization process/biochar yield/heavy metal分类
化学化工引用本文复制引用
王亮才,马欢欢,周建斌..炭化工艺对脱水沼渣炭理化性质的影响[J].化工进展,2019,38(3):1545-1551,7.基金项目
国家重点研发计划(2016YFE0201800) （2016YFE0201800）
常州市杰出创新人才云计划(CQ20164009) （CQ20164009）
