| Title | The bio-chemical cycle of iron and the function induced by ZVI addition in anaerobic digestion: A review |
|---|---|
| ID_Doc | 9715 |
| Authors | Zhang, JX; Qu, YY; Qi, QX; Zhang, PS; Zhang, YB; Tong, YW; He, YL |
| Title | The bio-chemical cycle of iron and the function induced by ZVI addition in anaerobic digestion: A review |
| Year | 2020 |
| Published | |
| Abstract | 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, ni-trogen, 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 CH4 from CO2, 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. (c) 2020 Elsevier Ltd. All rights reserved. |
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