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首页> 外文期刊>Waste Management >Inhibition of volatile fatty acids on methane production kinetics during dry co-digestion of food waste and pig manure
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Inhibition of volatile fatty acids on methane production kinetics during dry co-digestion of food waste and pig manure

机译：餐厨垃圾与猪粪干式共消化过程中挥发性脂肪酸对甲烷生成动力学的抑制作用

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摘要

Compared with wet digestion, dry digestion of organic wastes reduces reactor volume and requires less energy for heating, but it is easily inhibited by high volatile fatty acid (VFA) or ammonia concentration. The inhibition on methane production kinetics during dry co-digestion of food waste and pig manure is rarely reported. The aim of this study was to explore the inhibition mechanisms and the microbial interactions in food waste and pig manure dry co-digestion systems at different inoculum rates (25% and 50% based on volatile solids) and food waste/pig manure ratios (0:100, 25:75, 50:50, 75:25 and 100:0 based on volatile solids). The results showed that the preferable operation conditions were obtained at the inoculum rate of 50% and food waste/pig manure ratio of 50:50, with a specific methane yield of 263 mL/g VSadded. High WA concentration was the main inhibition factor on methane production, and the threshold VFA inhibition concentrations ranged 16.5-18.0 g/L. Syntrophic oxidation with hydrogenotrophic methanogenesis might be the main methane production pathway in dry co-digestion systems due to the dominance of hydrogenotrophic methanogens in the archaeal community. In conclusion, dry co-digestion of food waste and pig manure is feasible for methane production without pH adjustment and can be operated stably by choosing proper operation conditions. (C) 2018 Elsevier Ltd. All rights reserved.
机译：与湿法消化相比，有机废物的干法消化减少了反应器的体积，并且加热所需的能量更少，但是容易被高挥发性脂肪酸（VFA）或氨浓度抑制。很少有关于在食物垃圾和猪粪干式共消化过程中抑制甲烷生成动力学的报道。这项研究的目的是探讨在不同接种量（基于挥发性固体为25％和50％）和食物垃圾/猪粪的比率（0时）下，食物垃圾和猪粪干式共消化系统中的抑制机制和微生物相互作用。 ：100、25：75、50：50、75：25和100：0（基于挥发性固体）。结果表明，在接种率为50％，食物垃圾/猪粪比为50:50的条件下，以263 mL / g VS的比甲烷收率获得了较好的操作条件。高WA浓度是抑制甲烷生成的主要因素，阈值VFA抑制浓度范围为16.5-18.0 g / L。由于古生菌中氢营养型产甲烷菌的优势，具有氢营养型甲烷生成的营养氧化可能是干燥共消化系统中甲烷的主要生产途径。综上所述，干式共消化食物垃圾和猪粪可用于甲烷生产而无需调节pH值，并且可以通过选择合适的操作条件来稳定运行。 （C）2018 Elsevier Ltd.保留所有权利。

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