Department of Environment and Energy, Sejong University, Seoul 05006, Republic of Korea.
Department of Civil and Environmental Engineering, Sejong University, Seoul 05006, Republic of Korea.
J Hazard Mater. 2021 Jun 15;412:125242. doi: 10.1016/j.jhazmat.2021.125242. Epub 2021 Jan 26.
Recent abnormal climate changes resulted in the dramatic alternation of rainfall and flood patterns in many countries. The massive generation of flood debris, a mixture of soil (sediment), biomass, plastic, metal, and various hazardous materials, poses various environmental and public health problems. This study suggests a sustainable technical platform to convert the hazardous materials into value-added products. CO-assisted pyrolysis was used to thermally convert flood debris into syngas (H and CO). CO enhanced the syngas production due to gas phase homogeneous reactions (HRs) between CO and volatile hydrocarbons evolved from pyrolysis of flood debris. For improvement of HRs in line with enhancement of syngas production, additional thermal energy and earth abundant catalyst were used. In particular, Ni/SiO catalyst increased more than one order of magnitude higher syngas production, comparing to non-catalytic pyrolysis. Synergistic effect of CO and Ni catalyst showed nearly 50% more production of syngas in reference to catalytic pyrolysis under N. During flood debris pyrolysis, compositional matrix of flood debris was also determined by detecting index chemicals of waste materials that cannot be identified by naked eyes. Thus, this study confirmed that CO-assisted pyrolysis is a useful tool for conversion of flood debris into value-added chemicals.
最近异常的气候变化导致许多国家的降雨和洪水模式发生了剧烈变化。大量洪水残骸的产生，是土壤（沉积物）、生物质、塑料、金属和各种有害物质的混合物，带来了各种环境和公共卫生问题。本研究提出了一个可持续的技术平台，将危险材料转化为增值产品。CO 辅助热解将洪水残骸转化为合成气（H 和 CO）。由于 CO 与洪水残骸热解产生的挥发性碳氢化合物之间的气相均相反应（HRs），CO 增强了合成气的产生。为了提高 HRs，以适应提高合成气的产量，额外的热能和丰富的地球催化剂被使用。特别是 Ni/SiO 催化剂的使用，使得合成气的产量增加了一个数量级以上，与非催化热解相比。CO 和 Ni 催化剂的协同作用表明，在 N 下进行催化热解时，合成气的产量增加了近 50%。在洪水残骸热解过程中，通过检测无法用肉眼识别的废物的指标性化学物质，也确定了洪水残骸的组成基质。因此，本研究证实 CO 辅助热解是将洪水残骸转化为增值化学品的有用工具。
