In this study, a pilot-scale anaerobic membrane bioreactor (AnMBR) was developed to continuously produce volatile fatty acids (VFAs) from kitchen waste slurry under an alkaline condition. The alkaline fermentation effectively suppressed methanogenesis, thus achieving high VFAs production of 60.3 g/L. Acetic acid, propionic acid, and butyric acid accounted for over 95.0 % of the total VFAs. The VFAs yield, productivity, and chemical oxygen demand (COD) recovery efficiency reached 0.5 g/g-COD, 6.0 kg/m/d, and 62.8 %, respectively. Moreover, the COD/COD ratio exceeded 96.0 %, and the COD/NH-N ratio through ammonia distillation reached up to 192.5. The microbial community was reshaped during the alkaline fermentation with increasing salinity. The membrane fouling of the AnMBR was alleviated by chemical cleaning and sludge discharge, and membrane modules displayed a sustained filtration performance. In conclusion, this study demonstrated that high-quality VFAs could be efficiently produced from kitchen waste slurry using an AnMBR process via alkaline fermentation.

中文翻译：

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利用厌氧膜生物反应器通过高盐度碱性发酵生产厨余垃圾浆挥发性脂肪酸：工艺性能和微生物演替评价

在这项研究中，开发了一种中试规模的厌氧膜生物反应器（AnMBR），可以在碱性条件下从餐厨垃圾浆中连续生产挥发性脂肪酸（VFA）。碱性发酵有效抑制了产甲烷作用，从而实现了VFAs高产60.3 g/L。乙酸、丙酸和丁酸占VFA总量的95.0%以上。 VFA产率、生产率和化学需氧量（COD）回收率分别达到0.5 g/g-COD、6.0 kg/m/d和62.8%。而且COD/COD比值超过96.0%，氨蒸馏COD/NH-N比值达到192.5。随着盐度的增加，微生物群落在碱性发酵过程中被重塑。通过化学清洗和污泥排放，AnMBR的膜污染得到缓解，膜组件表现出持续的过滤性能。总之，本研究表明，使用 AnMBR 工艺通过碱性发酵，可以有效地从餐厨垃圾浆中生产出高质量的 VFA。