This study coupled anaerobic digestion with vacuum stripping to achieve stable digestion at higher organic loading rates. Besides mitigation of ammonia inhibition, vacuum stripping of digestate improves solids solubilization and dewaterability due to vacuum-enhanced low-temperature thermal and mild-alkaline treatment under the vacuum stripping conditions (65 °C, 25–27 kPa, and pH 9). Batch vacuum stripping for 8 h removed 97.4–99.4% of ammonia, increased the dissolved fraction of volatile solids (VS) by 72.5%, and improved dewaterability with 30% decreases in time-to-filter and viscosity. The digesters having 2.9% of digestate replaced daily by vacuum stripped digestate were stable up to organic loading rate of 4.3 g-VS/L_reactor/d with biogas production at 3.15 L/L_reactor/d, while the digesters without stripping attained biogas production of 1.90 L/L_reactor/d at its highest stable organic loading rate of 2.5 g-VS/L_reactor/d. Acetoclastic Methanosaeta were the dominant methanogens, which became more resistant to ammonia stress in the digesters with vacuum stripping.

该研究将厌氧消化与真空汽提相结合，以在较高的有机负载率下实现稳定的消化。除了减轻氨气抑制外，由于真空汽提条件（65 °C、25-27 kPa 和 pH 9）下的真空增强低温热处理和温和碱性处理，消化物的真空汽提提高了固体溶解性和脱水性。8 小时的批量真空汽提去除了 97.4-99.4% 的氨，将挥发性固体 (VS) 的溶解分数增加了 72.5%，并改善了脱水能力，过滤时间和粘度降低了 30%。具有消化物的2.9％的沼气池通过真空汽提消化物每天更换是稳定高达4.3克-VS / L的有机负荷率_反应器/ d与沼气生产在3.15 L / L_反应器/d，而没有汽提的消化器在其最高稳定有机负荷率为 2.5 g-VS/L_反应器/d 时达到了 1.90 L/L_反应器/d 的沼气产量。乙酰碎屑甲烷菌是主要的产甲烷菌，它们在真空汽提的消化器中变得更能抵抗氨压力。