Research Centre for Animal Production and Aquaculture, Consiglio per la ricerca in agricoltura e l'analisi dell'economia agraria (CREA), Via Beccastecca 345, 41018, San Cesario sul Panaro, Modena, Italy.
Appl Microbiol Biotechnol. 2019 Oct;103(19):8267-8279. doi: 10.1007/s00253-019-10087-8. Epub 2019 Aug 28.
Recycling of waste cooking oil greatly reduces the environmental impact of its disposal. As fats can give rise to high methane yields, the use of waste cooking oil for biogas production seems a promising solution. The aim of this work was to test the anaerobic digestion performances of waste cooking oil in co-digestion with pig slurry, the fat degradation dynamics and the relationships between digestion performances and pig slurry compositional properties. In laboratory batch, static, mesophilic anaerobic conditions, the treatments waste cooking oil in synthetic hydration medium (WCO + HM) and waste cooking oil in pig slurry (WCO + PS) were compared. Pig slurry alone was included for reference. Co-digestion with pig slurry greatly shortened the lag phase (by 58.3%) and increased the overall methane production per reactor (by 15.5%). An increase in emulsion stability of the biphasic system and an earlier triglyceride degradation were associated with the better anaerobic digestion performances in the WCO + PS reactors. A negative, however reversible, effect of palmitic acid accumulation on methane production was also observed. These results are encouraging for the application of co-digestion of waste cooking oil and pig slurry in agricultural biogas plants.
废食用油的回收利用大大降低了其处置对环境的影响。由于脂肪可以产生高甲烷产量，因此利用废食用油进行沼气生产似乎是一种很有前途的解决方案。本工作旨在测试废食用油在与猪粪共消化时的厌氧消化性能、脂肪降解动力学以及消化性能与猪粪组成特性之间的关系。在实验室批处理、静态、中温厌氧条件下，比较了在合成水合介质中的废食用油处理（WCO+HM）和猪粪中的废食用油处理（WCO+PS）。单独添加猪粪作为参考。与猪粪共消化大大缩短了潜伏期（减少了 58.3%），并增加了每个反应器的总甲烷产量（增加了 15.5%）。双相体系的乳化稳定性提高和甘油三酯较早降解与 WCO+PS 反应器中更好的厌氧消化性能相关。还观察到棕榈酸积累对甲烷产量产生负面影响，但可恢复。这些结果对于在农业沼气厂中应用废食用油和猪粪共消化是令人鼓舞的。
