ABSTRACT

Volatile fatty acids (VFAs) are intermediate products in anaerobic digestion. The effect of substrate loading or inoculum to substrate ratio (ISR), the addition of methanogen inhibitor, O₂ presence, control the reactor’s pH, and inoculum adaptation on the VFAs production from food waste through acidogenesis process was investigated in this study. Addition of 2-bromoethane sulfonic (BES) as methanogen inhibitor suppressed VFA consumption by methanogens at ISR 1:1. At higher substrate loading (ISR 1:3), methane production can be suppressed even without the addition of BES. However, at high substrate loading, controlling the pH during acidogenesis is important to achieve high VFAs yield. Acclimatization of inoculum is also one of the strategies to achieve high VFA yield. The highest VFAs yield obtained in this work was 0.8 g VFA/g VS _added at ISR 1:3, controlled pH at 6, with the presence of initial O₂ (headspace unflushed).

摘要

挥发性脂肪酸（VFA）是厌氧消化中的中间产物。底物负载或接种底物比（ISR），添加产甲烷菌抑制剂O _2的影响在这项研究中，研究了存在，控制反应器的pH值以及接种物对食物垃圾通过产酸过程产生的VFA的适应性。加入2-溴乙烷磺酸（BES）作为产甲烷抑制剂可抑制ISR 1：1产甲烷菌消耗的VFA。在较高的底物负载下（ISR 1：3），即使不添加BES，也可以抑制甲烷的产生。但是，在高底物负载下，在产酸过程中控制pH对获得高VFA产量很重要。接种物的驯化也是实现高VFA产量的策略之一。在这项工作中获得的最高VFA产量是在ISR 1：3下_添加0.8 g VFA / g VS，_将pH值控制在6，同时存在初始O ₂（未顶空）。