China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 200240, China.
China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 200240, China.
Water Res. 2020 Nov 1;186:116405. doi: 10.1016/j.watres.2020.116405. Epub 2020 Sep 9.
Zero-valent iron (ZVI) is known to be an additive in facilitating waste treatment and improving biogas production in anaerobic digestion (AD) systems. This review concentrates on the chemical cycle of iron as well as the function of the iron cycle in the removal of four kinds of pollutants: organic carbon, nitrogen, sulphur and phosphorus, which are commonly encountered in waste treatment. In recent studies, the addition of ZVI to an AD system promoted the in-situ production of CH from CO, enabling carbon capture through biotechnology. Additionally, using iron-carbon microbial electrolytic cells in AD systems in order to accelerate electron transport, as well as specific pollutant degradation mechanisms, are illustrated in the present study. Particularly, the main factors affecting the removal efficiency of contaminants in a ZVI-AD system such as pH, VFA/ Alkalinity (ALK), oxidation-reduction potential and particle size are reviewed. According to the above characteristics, combined with technical model and economic analyses, an AD system based on ZVI was considered to be an economical, efficient and carbon-neutral pollutant treatment technology. Accordingly, Iron-based AD is suggested to be a promising and sustainable approach orientated to a circular economy, which may be applied to many waste treatments fields.
零价铁（ZVI）被认为是一种添加剂，可促进废物处理并提高厌氧消化（AD）系统中的沼气产量。本综述集中讨论了铁的化学循环以及铁循环在去除四种常见污染物（有机碳、氮、硫和磷）方面的功能，这些污染物在废物处理中经常遇到。在最近的研究中，将 ZVI 添加到 AD 系统中促进了 CO 原位生成 CH，从而通过生物技术实现碳捕获。此外，本研究还说明了在 AD 系统中使用铁碳微生物电解池来加速电子传递以及特定污染物降解机制。特别是，综述了影响 ZVI-AD 系统中污染物去除效率的主要因素，如 pH、VFA/碱度（ALK）、氧化还原电位和粒径。根据上述特点，结合技术模型和经济分析，认为基于 ZVI 的 AD 系统是一种经济、高效且碳中和的污染物处理技术。因此，建议基于铁的 AD 是一种有前途的、可持续的循环经济方法，可应用于许多废物处理领域。
