源头分离的工业废水可通过厌氧消化生产沼气

J. Elliott, Christian Krohn, Andrew S. Ball
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引用次数: 0

摘要

厌氧消化是一种潜在的工业废水处理方法,可提供宝贵的最终产品,包括可再生能源(沼气)。然而,废物流可能变化太大,在高容量时太稀释,或缺少稳定消化的关键成分;所有这些因素都会增加成本和操作难度,因此优化至关重要。厌氧消化可从工艺强化中获益,特别是将高强度源分离废水与生物固体生物炭作为化学和微生物稳定剂相结合,最大限度地减少体积。本研究调查了厌氧消化食品制造商和物流公司源头分离的工业废水的稳定性、产量和微生物群落动态,使用生物固体生物炭作为添加剂,重点关注气体和挥发性脂肪酸(VFA)的产量、工艺稳定性,以及在 30 天和 45 天水力停留时间(HRT)下使用台式半连续反应器的微生物群落。虽然气体产量低于预期,但在高 HRT 条件下仍能保持稳定。尽管 VFA 浓度较高,但在 30 天和 45 天的 HRT 条件下,每升反应器工作容积的甲烷产量分别达到 0.24 升/天和 0.43 升/天,这与微生物群落中 Methanosarcina 的相对丰度有关。基质、VFA 浓度和微生物群落之间存在相互作用。生物炭辅助厌氧消化技术有望处理源分离废水。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Source-Separated Industrial Wastewater Is a Candidate for Biogas Production through Anaerobic Digestion
Anaerobic digestion is a potential treatment for industrial wastewater that provides valuable end-products, including renewable energy (biogas). However, waste streams may be too variable, too dilute at high volumes, or missing key components for stable digestion; all factors that increase costs and operational difficulty, making optimisation crucial. Anaerobic digestion may benefit from process intensification, particularly the novel combination of high-strength source-separated wastewater to minimise volume, together with the use of biosolids biochar as a chemical and microbial stabiliser. This study investigates the stability, yield, and microbial community dynamics of the anaerobic digestion of source-separated industrial wastewater from a food manufacturer and a logistics company, using biosolids biochar as an additive, focusing on gas and volatile fatty acid (VFA) production, process stability, and the microbial community using bench-scale semi-continuous reactors at 30- and 45-day hydraulic retention time (HRT). While gas yields were lower than expected, stability was possible at high HRT. Methane production reached 0.24 and 0.43 L day−1 per litre reactor working volume at 30- and 45-day HRT, respectively, despite high VFA concentration, and was linked to the relative abundance of Methanosarcina in the microbial community. Interactions between substrate, VFA concentration, and the microbial community were observed. Biochar-assisted anaerobic digestion holds promise for the treatment of source-separated wastewater.
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