State Key Laboratory of Petroleum Pollution Control, CNPC Research Institute of Safety and Environmental Technology, Beijing 102206, China; CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China.
State Key Laboratory of Petroleum Pollution Control, CNPC Research Institute of Safety and Environmental Technology, Beijing 102206, China.
J Hazard Mater. 2021 Jan 5;401:123820. doi: 10.1016/j.jhazmat.2020.123820. Epub 2020 Sep 3.
The oily sludge is a category of hazardous solid waste generated in petrochemical industries. Pyrolysis is an efficient approach for sustainable treating the oily sludge with limited environmental impacts, but the pollutant emission during the pyrolysis process is still a big challenge. Herein, the emission characteristics of nitrogen (N) and sulfur (S) containing pollutants during the oily sludge pyrolysis with and without catalysis was illuminated via a TG-FTIR-MS system (ThermoGravimetric-Fourier Transform InfaRed-Mass Spectroscopy). The FeMg layer double hydroxide (FeMg LDH) was employed as a catalyst for pyrolysis. The emission characteristics of six inorganic N-/S-containing pollutants, as well as ten organic N- and nine S-containing pollutants were analyzed. The results indicate that the FeMg LDH could efficiently suppress the emission of N-/S-containing pollutants. The amide and heterocyclic-N species were identified as primary resources of N-containing pollutants emission. The aliphatic- and disulfides-S were the main contributions to the S-pollutants emission. Comprehensive analysis of pollutants emission characteristics for oily sludge pyrolysis could provide a better understanding for sustainable managements of the hazardous solid wastes.
油泥是石化行业产生的一类危险固体废物。热解是一种可持续处理油泥的有效方法，对环境的影响有限，但热解过程中的污染物排放仍然是一个巨大的挑战。在此，通过热重-傅里叶变换红外-质谱联用系统（ThermoGravimetric-Fourier Transform InfaRed-Mass Spectroscopy）研究了有催化和无催化条件下油泥热解过程中含氮（N）和含硫（S）污染物的排放特性。采用 FeMg 层状双氢氧化物（FeMg LDH）作为热解催化剂。分析了六种无机 N-/S-含污染物以及十种有机 N-和九种 S-含污染物的排放特征。结果表明，FeMg LDH 可以有效地抑制 N-/S-含污染物的排放。酰胺和杂环-N 物种被确定为 N-含污染物排放的主要来源。脂肪族和二硫化物-S 是 S-污染物排放的主要贡献者。对油泥热解过程中污染物排放特性的综合分析，可以为危险固体废物的可持续管理提供更好的理解。
