Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark.
Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark.
Water Res. 2015 Aug 1;79:119-27. doi: 10.1016/j.watres.2015.04.034. Epub 2015 May 6.
Foaming is one of the major operational problems in biogas plants, and dealing with foaming incidents is still based on empirical practices. Various types of antifoams are used arbitrarily to combat foaming in biogas plants, but without any scientific support this action can lead to serious deterioration of the methanogenic process. Many commercial antifoams are derivatives of fatty acids or oils. However, it is well known that lipids can induce foaming in manure based biogas plants. This study aimed to elucidate the effect of rapeseed oil and oleic acid on foam reduction and process performance in biogas reactors fed with protein or lipid rich substrates. The results showed that both antifoams efficiently suppressed foaming. Moreover rapeseed oil resulted in stimulation of the biogas production. Finally, it was reckoned that the chemical structure of lipids, and more specifically their carboxylic ends, is responsible for their foam promoting or foam counteracting behaviour. Thus, it was concluded that the fatty acids and oils could suppress foaming, while salt of fatty acids could generate foam.
起泡是沼气厂的主要运行问题之一，而处理起泡事件仍然基于经验实践。各种类型的消泡剂被任意用于沼气厂的消泡，但没有任何科学支持，这种做法会导致产甲烷过程严重恶化。许多商业消泡剂是脂肪酸或油的衍生物。然而，众所周知，脂肪可以在基于粪便的沼气厂中引起起泡。本研究旨在阐明菜籽油和油酸对富含蛋白质或脂质的底物喂养的沼气反应器中泡沫减少和过程性能的影响。结果表明，两种消泡剂都能有效地抑制泡沫。此外，菜籽油还能刺激沼气的产生。最后，据认为，脂质的化学结构，更具体地说是其羧酸末端，负责其促进泡沫或抑制泡沫的行为。因此，可以得出结论，脂肪酸和油可以抑制泡沫，而脂肪酸的盐可以产生泡沫。
