Tea Spent Dewatering Screw Press
Tea Spent Dewatering Screw Press: Turning Extraction Waste into Sustainable Fuel
The global tea industry generates vast volumes of tea spent—the fibrous material left after extracting active compounds from tea leaves. Once considered a disposal burden, this high-moisture waste can now be transformed into a valuable biomass resource with the help of a Tea Spent Dewatering Screw Press.
What is Tea Spent?
Tea spent is the wet residue remaining after the tea extraction process, where tea leaves are subjected to hot water or steam to extract caffeine, polyphenols, flavors, and other bioactive compounds. This process is commonly used in manufacturing instant tea, tea concentrates, functional beverages, and ready-to-drink formulations. The leftover material typically contains 80–85% moisture, making it heavy, difficult to handle, and costly to dispose of.
From Wet Waste to Energy Resource
In a recent project, we processed tea spent that arrived at 85% feed moisture. Our dewatering screw press reduced the moisture to 60–62%, effectively removing a substantial portion of both free and absorbed water. The success of the press was confirmed through the widely used "fist test"—where a handful of pressed material, when squeezed, did not release even a single drop of water. This indicates optimal dewatering performance.
Integration with Rotary Dryer and Boiler
Following dewatering, the material was fed directly into a rotary drum dryer, further reducing moisture to levels suitable for direct combustion in the plant’s boiler. The dried tea spent was used as a substitute biomass fuel, significantly reducing the factory's reliance on conventional fuels.
This integrated system eliminated the cost of wet material disposal and reduced drying energy consumption, leading to a rapid return on investment (ROI) and ongoing operational savings.
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