Abstract：
Fe3O4 addition in anaerobic fermentation of food waste (FW) is promising for enhancing volatile fatty acids (VFAs) production. However, the large amount of Fe3O4 in the digestate fertilizer leads to the waste of resources and possible toxicity to organisms. Thus, this study investigated the feasibility of Fe3O4 recycling for VFAs enhancement in anaerobic fermentation of FW and performed the cost-benefit evaluation of this process. Results revealed that Fe3O4 could be successfully recycled twice with recovery rates of 71.5% and 65.5%, respectively. X-ray diffraction analysis revealed a slight change to the Fe2O3-like structure after 2-time recycling. The VFAs yields were enhanced by 17.2% and 17.0% in Cycles 1 and 2 owing to the enhanced activities of hydrolytic and acid-forming enzymes. The net income of the Fe3O4 recycling process was about 13-fold higher than that of the conventional treatment process, suggesting a promising and economically feasible strategy for enhancing VFAs production.
摘要：
在餐厨垃圾（FW）的厌氧发酵中添加Fe3O4有望提高挥发性脂肪酸（VFA）的产量。然而,肥料中大量的Fe3O4会导致资源浪费和对生物的毒性。因此，本研究探讨了Fe3O4回收用于FW厌氧发酵中VFAs增强的可行性，并对该过程进行了成本效益评估。结果表明，Fe3O4可以成功回收两次，回收率分别为71.5%和65.5%，分别。X-射线衍射分析显示,在2次循环后,Fe2O3样结构有轻微变化。由于水解和酸形成酶的活性增强，在循环1和2中VFA的产量分别提高了17.2％和17.0％。Fe3O4回收工艺的净收入比常规处理工艺高出约13倍,提出了一种有前途且经济可行的提高VFA产量的策略。
