Abstract

Anaerobic digestion (AD) is considered as a traditional method for biomethane recovery from high-strength waste and wastewater. The limitations of conventional anaerobic digestion processes include sluggish kinetics, process instability, and low methane yield. Recently, microbial electrolysis cell (MEC) has been demonstrated as a promising approach for enhancing biomethane recovery from various organic feedstocks. In recent years, a variety of hybrid anaerobic bioreactors coupling MEC and AD were employed to improve biomethane recovery and anaerobic treatability of various high-strength feedstocks. The MEC-AD integrated systems also exhibited better process stability than traditional anaerobic digesters by alleviating the accumulation of short-chain volatile fatty acids at higher organic loading rates, as well as mitigating the inhibitory effects of various toxic and refractory compounds. Firstly, this article provides a comprehensive performance review of the MEC-AD systems treating various high-strength (>8 g COD/L) substrates. Secondly, the implications of process parameters, energy efficiencies, and microbial community characteristics are discussed. Finally, valuable operational insights and future research needs are highlighted.

摘要

厌氧消化 (AD) 被认为是从高强度废物和废水中回收生物甲烷的传统方法。传统厌氧消化过程的局限性包括缓慢的动力学、过程不稳定和低甲烷产率。最近，微生物电解池 (MEC) 已被证明是一种有前景的方法，可提高各种有机原料的生物甲烷回收率。近年来，多种混合厌氧生物反应器耦合MEC和AD被用于提高各种高强度原料的生物甲烷回收率和厌氧处理能力。MEC-AD 集成系统还表现出比传统厌氧消化器更好的过程稳定性，通过在更高的有机负载率下减轻短链挥发性脂肪酸的积累，以及减轻各种有毒和难治化合物的抑制作用。首先，本文对处理各种高强度 (>8 g COD/L) 基材的 MEC-AD 系统进行了全面的性能评估。其次，讨论了工艺参数、能源效率和微生物群落特征的影响。最后，强调了宝贵的运营见解和未来的研究需求。