金属离子强化餐厨垃圾高温厌氧发酵产酸

Enhancement of volatile fatty acid production from anaerobic fermentation of food wastes under thermophilic condition by adding metal ions

以经过高温驯化的污泥作为厌氧微生物,以餐厨垃圾作为发酵基质,向发酵体系中加入不同浓度Fe^(2+)、Mg^(2+)和Ni^(2+)进行单因素实验。实验结果表明:当Fe^(2+)、Mg^(2+)和Ni^(2+)加入量分别为800、250和0.50 mg/L时,挥发性脂肪酸(VFA)的产量最大,分别为23.58、22.38和23.08 g/L;加入不同浓度Fe^(2+)、Mg^(2+)和Ni^(2+)的厌氧发酵液相产物中丁酸含量均最高,但在一定浓度范围内随着金属离子的添加,发酵产物中丁酸所占的比例逐渐减小,乙酸所占比例逐渐增加;加入适量金属离子在一定程度上能够抑制发酵液中氨氮的溶出。

In this study,food waste was fermented using acclimated anaerobic sludge under thermophilic conditions. Single-factor experiments were conducted by adding different concentrations of Fe^（2＋）Mg^（2＋）and Ni^（2＋）into the fermentation system. Highest VFA output（ 23. 58,22. 38,and 23. 08 g / L） was obtained when 800,250,and 0. 5 mg / L of Fe^（2＋）,Mg^（2＋）and Ni^（2＋）,respectively,were added to the fermentation system. Butyrate was dominant in liquid products obtained from the anaerobic fermentation system containing different concentrations of Fe^（2＋）,Mg^（2＋）and Ni^（2＋）. However,acetate concentration increased and butyrate concentration decreased after adding the metal ions. Further,addition of appropriate concentrations of the metal ions inhibited the release of ammonia in the fermentation system.