Oil in the food waste can contribute improved energy yield by anaerobic digestion, and also poses an inhibition risk from the intermediate long chain fatty acids (LCFAs). The digestion performance partly depends on the solubility of oil/LCFAs concerned recently, while mixing intensity control can disturb the solubility characteristics. Combined with oil loading such a fundamental control parameter, co-effects of mixing intensity and oil loading on methanogenic characteristics were illuminated. A series of mixing intensities 0–240 rpm and oil/inoculum (F/I) ratios 0.2–1.2 were set to conduct a batch experiment, and relevant affecting mechanisms were further disclosed as well. It turned out that variation of mixing intensity could have effects on methanogenesis from oil in food waste. Increasing mixing intensity prolonged lag phase. Mixing intensity at 120 rpm was proved as a starting point to disturb LCFA inhibition. Methanogenic rates climbed to the top at F/I 0.4, and further increase loading resulted in the rate decline. Methanogenic potential release was also reduced with both mixing intensity and loading at higher values. Hereinto, oleic acid (C18:1) as a key LCFA in oil played an important role in inhibition, while higher mixing intensity and loading could promote degradation and conversion of another critical LCFA palmitic acid (C16:0). The study favors achieving a cost-effective strategy controlled by mixing intensity to promote safe energy improvement.

中文翻译：

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通过厌氧消化将食物垃圾中的油转化为甲烷：混合强度和长链脂肪酸负载的共同影响


食物垃圾中的油可以通过厌氧消化提高能量产量，同时也会产生中间长链脂肪酸 (LCFA) 的抑制风险。消化性能部分取决于最近关注的油/LCFA 的溶解度，而混合强度控制可能会干扰溶解度特性。结合含油量这一基本控制参数，阐明了混合强度和含油量对产甲烷特性的共同影响。设置一系列混合强度0-240 rpm和油/接种物（F/I）比0.2-1.2进行批量实验，并进一步揭示了相关的影响机制。事实证明，混合强度的变化可能会影响食物垃圾中油的产甲烷作用。增加混合强度延长滞后期。 120 rpm 的混合强度被证明是干扰 LCFA 抑制的起点。产甲烷率在F/I 0.4时达到最高值，进一步增加负荷导致产甲烷率下降。混合强度和负载量较高时，产甲烷潜力的释放也会减少。其中，油酸（C18:1）作为油中关键的LCFA发挥着重要的抑制作用，而较高的混合强度和负载量可以促进另一种关键的LCFA棕榈酸（C16:0）的降解和转化。该研究倾向于实现通过混合强度控制的成本效益策略，以促进安全能源的改进。