Coffee wastewater, also known as Coffee effluent, is a byproduct of the coffee processing process whose treatment and disposal is an important environmental consideration for Coffee processing. It is a form of industrial water pollution.
The unpicked fruit of the coffee tree, known as the coffee cherry, must undergo a long process to make it ready for consumption. This process often entails the usage of massive amounts of water and the production of considerable amounts of both solid and liquid waste. To determine the type of waste stemming from coffee processing, it is important to know how the coffee cherries are processed. The conversion of the cherry to oro or green bean (the dried coffee bean which is ready to be exported) can be achieved through three different processing techniques: dry, semi-washed, and fully washed.
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—Coleman Dowell (1925–1985)