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Step 1: Tea Brewing
The process begins with the selection of tea, with common varieties including black, green, white, oolong, and blended teas. Each type of tea provides different levels of tannins, antioxidants, and flavor compounds, which directly affect the taste of kombucha. Whole-leaf teas release tannins and other compounds more slowly, while processed tea bags, with their larger surface area, release caffeine more quickly.
Step 2: Tea Dilution
The brewed tea is usually highly concentrated and at a higher temperature, so it needs to be mixed with brewing water at room temperature in a specific ratio. This helps cool the tea and facilitates subsequent fermentation while also reducing the concentration and increasing the yield.
Step 3: Primary Fermentation
The diluted tea is transferred to the first-stage fermenter for fermentation. This stage typically takes place in an open, flat-top, atmospheric pressure fermentation tank with a large diameter and low height for easy operation. The fermentation temperature is usually between 22–28°C, and the process lasts for approximately seven days.
Step 4: Secondary Fermentation
After the primary fermentation is complete, the tea is transferred to a closed secondary fermentation vessel. During this stage, juice or puree is often added to the tea to enhance its flavor. The fermentation temperature is generally maintained around 15°C, and the process lasts for another seven days.
Step 5: Filtration
Once the secondary fermentation is complete, the tea undergoes a final filtration process to remove particulate impurities. Common filtration methods include kieselguhr filtration and multi-tier fine membrane filtration (10 microns, 5 microns, and 0.5 microns).
Step 6: Brite Tank
The brite tank is used to mix flavorings, initiate secondary fermentation, and carbonate the kombucha before packaging and distribution.
Step 7: Filling
The filling process requires careful temperature control to slow down fermentation and prevent over-carbonation or bottle explosions. The filling machines are equipped with sensors that monitor and adjust filling speed and pressure, allowing for adaptation based on the fermentation stage and ensuring consistency in carbonation levels. These machines are made from corrosion-resistant materials to withstand kombucha’s acidity and are designed with minimal areas for residue accumulation, ensuring cleanliness and safety.
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Tonsen’s 50HL Industry Brewery Equipment: scalable, energy-efficient, advanced brewing for industrial breweries. Elevate production today!
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