摘要:在中温条件下以污泥为接种物,以餐厨垃圾为发酵底物,通过向厌氧发酵系统中投加不同量的Fe^0,考察其对餐厨垃圾厌氧发酵过程中日产气量、累积产气量、SCOD、氨氮、挥发性脂肪酸(VFAs)以及厌氧发酵体系中抗生素抗性基因行为特征的影响(包括β-内酰胺类 blaOXA-1、blaTEM,大环内脂类 ermB、ermF、mefA,磺胺类 sul1、sul2,四环素类 tetM、tetO、tetQ、tetW、tetX 和Ⅰ类整合子 intI1)。结果表明:投加Fe^0可以起到提高产气量,促进有机物的水解,缓解酸抑制的作用,当投加20 g/L Fe^0时产气量最高。由于经过湿热水解预处理,原始餐厨垃圾的抗性基因丰度较低,但接种污泥中 ermF、tetO、tetQ和tetW的丰度较高,分别为5.13×10^5,3.04×10^5,2.03×10^5,1.11×10^5 copies/g,经厌氧发酵后这4种抗性基因丰度削减明显,但是 mefA和tetM 的丰度与原始投加物料相比有所增长,投加20 g/L Fe^0与未投加Fe^0相比, mefA、tetM 2种抗性基因的丰度有一定削减。
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