Department of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran.
School of Environment, College of Engineering, University of Tehran, Iran.
Sci Total Environ. 2020 Aug 20;731:138863. doi: 10.1016/j.scitotenv.2020.138863. Epub 2020 Apr 28.
Landfill leachate is a significant environmental threat due to the complexity and variety of its pollutants. There are various physical, chemical, and biological treatment methods proposed for leachate treatment. Adsorption with conventional adsorbents such as activated carbon is a process which has been widely employed with relative success. Magnetic adsorbents are a special type of adsorbents with favorable stability, high adsorption capacities, and excellent recycling and reuse capabilities when compared to conventional sorbents. Research regarding the synthesis and use of magnetic adsorbents has been growing at a rapid pace, exhibiting >8-fold increase in publications in the decade of 2010 to 2020. In the current study, both conventional and magnetic adsorbents for landfill leachate treatment have been comprehensively reviewed and discussed. The application of magnetic adsorbents for landfill leachate treatment is relatively new, with numerous avenues of research open to study. Although the production of magnetic adsorbents is significantly more expensive than conventional adsorbents, when taking into consideration all life cycle costs, they are much more competitive than it initially appears. If environmental impacts are of concern, research should shift towards the use of greener chemicals and processes for magnetic adsorbent synthesis, because preliminary analysis of the current synthesis processes shows a much higher environmental impact compared to conventional adsorbents, in particular in terms of global warming potential and energy use.
垃圾渗滤液是一种对环境有重大威胁的污染物，因为其成分复杂且种类繁多。针对渗滤液处理，已经提出了各种物理、化学和生物处理方法。吸附法是一种应用广泛且相对成功的处理方法，其中使用的常规吸附剂有活性炭等。与常规吸附剂相比，磁性吸附剂具有更好的稳定性、更高的吸附容量，以及更出色的可回收和再利用性能，是一种特殊类型的吸附剂。关于磁性吸附剂的合成和应用的研究正在迅速发展，在 2010 年至 2020 年的十年间，其出版物增长了 8 倍以上。在本研究中，全面回顾和讨论了用于垃圾渗滤液处理的常规吸附剂和磁性吸附剂。磁性吸附剂在垃圾渗滤液处理中的应用相对较新，有许多研究领域有待研究。虽然磁性吸附剂的生产比常规吸附剂昂贵得多，但如果考虑到所有生命周期成本，它们的竞争力比最初看起来要强得多。如果关注环境影响，则应研究使用更环保的化学品和磁性吸附剂合成工艺，因为对当前合成工艺的初步分析表明，与常规吸附剂相比，其环境影响要大得多，特别是在全球变暖潜能值和能源利用方面。
