College of Environmental Science and Engineering, Taiyuan University of Technology, Jinzhong 030600, PR China; School of Environment, Tsinghua University, Beijing 10084, PR China.
College of Environmental Science and Engineering, Taiyuan University of Technology, Jinzhong 030600, PR China.
Sci Total Environ. 2021 Oct 15;791:148415. doi: 10.1016/j.scitotenv.2021.148415. Epub 2021 Jun 10.
Zero valent iron (ZVI) has been used extensively to control environmental pollution owing to its strong reducibility and low cost. Herein, we evaluate the impact of ZVI (iron scrap and ZVI powder with different scales) on anaerobic digestion (AD) reactor performance improvement and syntrophic relationship stimulation among various microbial groups in the methanogenesis process. In recent studies, ZVI addition significantly enhanced methane and volatile fatty acid (VFA) yields and alleviated excessive acidification, ammonia accumulation, and odorous gas production. Further, we reviewed the changes in enzyme activity and microbial metabolism after the addition of ZVI throughout the reaction process. Certain innovative technologies, such as bioelectrochemical system assistance and combined usage of conductive materials, may improve AD performance compared to the use of ZVI alone, the mechanism of which has been discussed from various viewpoints. Furthermore, the primary technical bottlenecks, such as poor mass transfer efficiency in dry AD and high ZVI dosage, have been illustrated, and syntrophic methanogenesis regulated by ZVI addition can be further studied by conducting theoretical research.
零价铁 (ZVI) 由于其强还原性和低成本而被广泛用于控制环境污染。在此，我们评估了 ZVI（废铁和不同粒径的 ZVI 粉末）对厌氧消化（AD）反应器性能的改善以及在产甲烷过程中各种微生物组之间协同关系的刺激作用。在最近的研究中，添加 ZVI 显著提高了甲烷和挥发性脂肪酸（VFA）的产率，并缓解了过度酸化、氨积累和恶臭气体的产生。此外，我们还综述了在整个反应过程中添加 ZVI 后酶活性和微生物代谢的变化。与单独使用 ZVI 相比，某些创新技术，如生物电化学系统辅助和导电材料的联合使用，可能会提高 AD 性能，其机制已从多个角度进行了讨论。此外，还说明了主要的技术瓶颈，如干 AD 中较差的传质效率和高 ZVI 剂量，并通过理论研究进一步研究了 ZVI 添加调控的协同产甲烷作用。
