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首页> 外文期刊>Fuel >A stepwise microwave synergistic pyrolysis approach to produce sludge-based biochars: Feasibility study simulated by laboratory experiments
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A stepwise microwave synergistic pyrolysis approach to produce sludge-based biochars: Feasibility study simulated by laboratory experiments

机译：逐步微波协同热解法生产基于污泥的生物炭：通过实验室实验模拟的可行性研究

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摘要

A stepwise microwave synergistic pyrolysis (SMSP) approach is proposed as a new way to relieve disposal problems of the sewage sludge. Here the sludge is first pre-pyrolyzed by a conventional heating stage, and then rapidly pyrolyzed by a microwave-induced heating stage without any extra microwave absorbers or blending needed. Under simulated process pyrolysis conditions, the dried sludge, intermediate and final sludge-based biochar samples were prepared in the laboratory. Their chemical composition, microstructure and morphology, and leaching toxicity of heavy metals were carefully characterized and analyzed by various techniques such as proximate and ultimate analysis, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Brunauer-Emmett-Teller (BET), and scanning electron microscope equipped with energy-dispersive x-ray spectroscopy (SEM-EDX). Results showed that the pre-pyrolytic biochar can be rapidly heated up to 1100 degrees C within 5 min under microwave irradiation. The pre-pyrolytic stage increased the carbonization and ash enrichment degree of the sludge which itself acted as a good microwave absorber while achieving a quick temperature rise under microwave irradiation. The ash remaining ratio and the specific surface area of the biochar derived from the SMSP approach (labelled as SBC2) are increased by 6.46% and 16.17% respectively, compared with the conventional biochar sample (SBC1). And SBC2 still had diverse surface functional groups kept after SMSP. The residual ratios of Ni, Cu, Zn, Pb, Cr and Cd in SBC2 was more noticeable than in SBC1 but the leaching ratios quite the contrary. Vitrification is also well proved by the increment of quartz peak detected by XRD tests, and the formation of melted glassy spheres with elemental composition of Si, Ca, Al observed by SEM-EDX. It can favorably increase solidification level and decrease leaching toxicity of heavy metals in the SBC2. The feasibility of this proposed SMSP concept has been positively supported by our experimental results. The properties of the sludge-based biochar produced from the SMSP approach also show great potential to be utilized as precursors to produce various adsorbents.
机译：提出了一种逐步微波协同热解（SMSP）方法，作为缓解污水污泥处置问题的新途径。在此，污泥首先通过常规加热阶段进行预热解，然后通过微波感应加热阶段进行快速热解，而无需任何额外的微波吸收剂或混合。在模拟的过程热解条件下，在实验室中准备了干污泥，中间污泥和最终污泥基生物炭样品。通过近距离和最终分析，X射线衍射（XRD），傅立叶变换红外（FTIR）光谱，Brunauer-Emmett-Teller等各种技术仔细表征和分析了它们的化学组成，微观结构和形态以及重金属的浸出毒性。 （BET），以及配有能量色散X射线光谱仪（SEM-EDX）的扫描电子显微镜。结果表明，在微波辐射下，热解前的生物炭可在5分钟内迅速加热到1100摄氏度。预热解阶段增加了污泥的碳化和灰分富集度，污泥本身是一种良好的微波吸收剂，同时在微波辐射下可实现快速升温。与常规生物炭样品（SBC1）相比，通过SMSP方法（标记为SBC2）得到的生物炭的灰分残留率和比表面积分别增加了6.46％和16.17％。在SSMP处理后，SBC2仍然保留了不同的表面官能团。与SBC1相比，SBC2中Ni，Cu，Zn，Pb，Cr和Cd的残留比率更明显，但浸出比率则相反。通过XRD测试检测到的石英峰的增加，以及通过SEM-EDX观察到的形成具有Si，Ca，Al元素组成的熔融玻璃球的形成，也很好地证明了玻璃化作用。它可以有利地提高SBC2中的固化水平并降低重金属的浸出毒性。我们的实验结果积极支持了该提议的SMSP概念的可行性。通过SMSP方法生产的基于污泥的生物炭的特性也显示出巨大的潜力，可以用作生产各种吸附剂的前体。

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  • 来源
    《Fuel》 |2020年第jul15期|117628.1-117628.10|共10页
  • 作者

  • 作者单位

    Shandong Univ Engn Res Ctr Environm Thermal Technol Sch Energy & Power Engn Minist Educ Natl Engn Lab Reducing Emiss Coal Combust Shandon Shandong 250061 Peoples R China;

    Linnaeus Univ Dept Built Environm & Energy Technol S-35195 Vaxjo Sweden;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sewage sludge; Microwave; Pyrolysis; Biochar; Heavy metals immobilization;

    机译：污水污泥;微波;热解;生物炭重金属固定化;

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