What is the reason for boiling fermentation and how to solve it?

Boiling fermentation is a kind of abnormal fermentation phenomenon, which often occurs in the later stage of high bubble stage or bubble falling stage, and sometimes occurs when the bubble cap is removed before the wine is poured. One condition is that the foam on the surface of the fermentation broth is pushed to the other side from the corner or side of the fermentation tank. Some of the liquid surface becomes white and the bubble cap disappears. In another case, a large number of CO2 bubbles are upwelling, and the fermentation broth drastically flipped like a fountain, bringing the precipitated yeast to the liquid level.

beer fermenter,brewery equipment,beer equipment, beer brewing equipment,microbrewery equipment,tiantai beer equipment,micro brewery equipment,beer machine,beer plant,brewery system,

beer fermenter,brewery equipment,beer equipment, beer brewing equipment,microbrewery equipment,tiantai beer equipment,micro brewery equipment,beer machine,beer plant,brewery system,

At present, the reason of boiling fermentation is not very clear, there are many explanations, and the more convincing ones are as follows.
① The yeast is impure and pollutes the gas producing bacteria. The gas producing bacteria precipitate to the bottom of the tank with the yeast and produce a large amount of CO2 to accumulate in the precipitated yeast. Finally, the yeast layer is washed away and rises sharply, forming boiling phenomenon.

② Wort is poor in composition and turbid. The solid matter in wort is precipitated to the bottom of the tank with yeast. Yeast continues to use the nutrients in the solid matter to ferment and produce CO2, which accumulates in wort. When the amount is large, the yeast will be washed away and the CO2 gas will rise to form boiling.

③ When the main fermentation temperature is too high, the temperature drops sharply in the later stage. When the bubble cap is removed, the surface tension of the fermentation broth decreases, resulting in a sharp rise of CO2 below, forming boiling fermentation.

④ Due to the reasons of the fermentation equipment itself, such as the different smoothness of the pool wall surface, the partial peeling of the coating, the scaling of some edges and corners, and the uneven bottom of the pool, a large amount of CO2 is produced and upwelling in a certain part of the pool, forming boiling fermentation.
Boiling fermentation will cause difficulties in beer clarification and reduce yeast recovery. Later boiling fermentation will involve the formed bubble cap into the fermentation broth, which will have adverse effects on the taste of beer.
Although there are different reasons for boiling fermentation, we should start from daily yeast management, process hygiene and saccharification operation to ensure clear and transparent wort, reasonable composition, robust and pure yeast, good sanitation of fermentation equipment, and avoid high and low fermentation temperature. In case of boiling fermentation, the yeast should not be recycled or stored separately, and be prepared for further culture.

Thank you very much for your reading.
Helen lee
Sales manager
[email protected]

Tags: beer brewing equipment 　　 micro brewery equipment 　　