在嗜热渗滤床反应器中进行食物垃圾的产酸消化：pH 值和渗滤液再循环速率对水解和挥发性脂肪酸生成的影响。
Acidogenic digestion of food waste in a thermophilic leach bed reactor: Effect of pH and leachate recirculation rate on hydrolysis and volatile fatty acid production.
机构信息
Anaerobic Technologies and Bioprocess Control Group, Energy, Mining and Environment, National Research Council Canada, Montreal, Canada.
Anaerobic Technologies and Bioprocess Control Group, Energy, Mining and Environment, National Research Council Canada, Montreal, Canada.
出版信息
Bioresour Technol. 2017 Dec;245(Pt A):1-9. doi: 10.1016/j.biortech.2017.08.130. Epub 2017 Aug 24.
The effect of pH control (4, 5, 6, 7) on volatile fatty acids (VFA) production from food waste was investigated in a leach bed reactor (LBR) operated at 50°C. Stabilisation of pH at 7 resulted in hydrolysis yield of 530g soluble chemical oxygen demand (sCOD)/kg total volatile solids (TVS) added and VFA yield of 247gCOD/kg TVS added, which were highest among all pH tested. Butyric acid dominated the VFA mix (49-54%) at pH of 7 and 6, while acetate composed the primary VFA (41-56%) at pH of 4 and 5. A metabolic shift towards lactic acid production was observed at pH of 5. Improving leachate recirculation rate further improved the hydrolysis and degradation efficiency by 10-16% and the acidification yield to 340gCOD/kgTVS added. The butyric acid concentration of 16.8g/L obtained at neutral pH conditions is among the highest reported in literature.
在 50°C 下运行的沥滤床反应器 (LBR) 中，研究了 pH 值控制（4、5、6、7）对食物垃圾中挥发性脂肪酸 (VFA) 生成的影响。将 pH 值稳定在 7 时，水解产率为 530g 可溶性化学需氧量 (sCOD)/kg 总挥发性固体 (TVS) 添加，VFA 产率为 247gCOD/kg TVS 添加，在所有测试的 pH 值中最高。在 pH 值为 7 和 6 时，丁酸占 VFA 混合物的主导地位（49-54%），而在 pH 值为 4 和 5 时，乙酸是主要的 VFA（41-56%）。在 pH 值为 5 时，观察到向乳酸生产的代谢转变。进一步提高渗滤液再循环率可将水解和降解效率提高 10-16%，酸化产率提高到 340gCOD/kgTVS 添加。在中性 pH 值条件下获得的 16.8g/L 丁酸浓度在文献中报道的最高浓度之列。
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