Beer production process
The beer production process consists of several stages, including malt production, wort preparation, primary fermentation, secondary fermentation, filtration and sterilization, and packaging.
Malt production: Barley (with wheat also being tested) is soaked to absorb water, then allowed to germinate under appropriate temperature and humidity conditions. During germination, various hydrolytic enzymes—such as proteases, amylases, and glucanases—are produced. These enzymes break down the malt’s own proteins into peptides and amino acids, and convert starches into lower‑molecular‑weight compounds like dextrins and maltose. Once germination reaches a certain stage, it is halted, and the malt is dried to reduce its moisture content.
Fermentation: After cooling, yeast is added to the wort, which is then transferred to fermentation tanks to begin the fermentation process. Traditionally, fermentation was divided into primary and secondary phases, carried out in separate tanks; however, the more common approach today is to perform both stages in a single tank. Primary fermentation primarily involves the yeast converting maltose in the wort into alcohol, while secondary fermentation focuses on developing flavor compounds, eliminating off‑flavors, and promoting maturation. During this phase, a controlled pressure is maintained in the tank to retain the carbon dioxide produced during secondary fermentation within the beer.
Filtration and sterilization: After approximately two weeks of fermentation—though some beers may ferment for several months—the beer is filtered to remove yeast and fine particulates, followed by low‑temperature pasteurization at around 62°C. Once cooled, the beer is ready for packaging.
Packaging: Common packaging methods include bottling, canning, and kegging.
In broad terms, beer production can be divided into three main stages: malt processing, brewing, and packaging.