03/11/2026
“There is a bitter irony here. Washed processing is often chosen precisely to control flavour by controlling fermentation. Yet the same biochemical richness that creates a controllable flavour environment inside tanks becomes a destructive, uncontrolled fermentation when it is released into nature. The wet mill, in effect, exports fermentation to the watershed.”
The day coffee turns into wastewater, and the quiet engineering that can keep rivers alive by Dr. Steffen Schwarz, Coffee Consulate According to a document from the Coffee Development Report 2022–23, the washed method has always worn the cleanest reputation in the cup, yet it leaves behind one of ...