从废水中长期产生碱性挥发性脂肪酸：pH 值的影响和 Dysgonomonadaceae 的优势。
Long-term alkaline volatile fatty acids production from waste streams: Impact of pH and dominance of Dysgonomonadaceae.
机构信息
Chemical Engineering Department, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
Sustainable Development, Environmental Science and Engineering Department, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
出版信息
Bioresour Technol. 2022 Feb;346:126621. doi: 10.1016/j.biortech.2021.126621. Epub 2021 Dec 24.
Alkaline co-fermentation of primary sludge and external organic waste (OW) was studied to elucidate the influence of substrate ratios and long-term system robustness and microbial community dynamics using batch and semi-continuous reactors. Volatile fatty acid (VFA) production increased with increasing OW fraction in the substrate due to synergistic effects of co-degradation. VFA production at pH 10 increased up to 30,300 mgCOD/L (yield of 630 mg COD/gVS) but reduced over time to ≈10,000 mgCOD/L. Lowering pH to 9 led to the restoration of VFA production with a maximum of 32,000 mg COD/L (676 mg COD/g VS) due to changes in microbial structure. VFA was composed mainly of acetic acid, but propionic acid increased at pH 9. The microbial community was dominated by Bacillaceae (34 ± 10%) and Proteinivoracales_uncultured (16 ± 11%) at pH 10, while Dysgonomonadaceae (52 ± 8%) was enriched at pH 9. The study demonstrated a zero-waste strategy that turns organic wastes into bio-based products.
采用批式和半连续式反应器研究了原生污泥和外加有机废物（OW）的碱性共发酵，以阐明基质比、长期系统鲁棒性和微生物群落动态的影响。由于共降解的协同作用，OW 分数增加时，挥发性脂肪酸（VFA）的产量增加。在 pH 10 时，VFA 的产量最高可达 30,300 mgCOD/L（产率为 630mg COD/gVS），但随着时间的推移而减少至 ≈10,000 mgCOD/L。将 pH 降低至 9 会由于微生物结构的变化而恢复 VFA 的产生，最高可达 32,000 mg COD/L（676 mg COD/g VS）。VFA 主要由乙酸组成，但丙酸在 pH 9 时增加。在 pH 10 时，微生物群落主要由芽孢杆菌科（34 ± 10%）和未培养的蛋白菌目（16 ± 11%）组成，而在 pH 9 时，Dysgonomonadaceae 科（52 ± 8%）被富集。该研究展示了一种将有机废物转化为基于生物的产品的零废物策略。
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