Starch is extracted from corn (60%), wheat (20%) and potato (20%). Starch production generates around 8 million tonnes of waste every year in the EC. This section will focus on potato starch extraction as this process produces the majority of the waste (5.5 million tonnes per year). Some 200 kg of starch is extracted from 1 tonne of potato: wastes represent 80% of the raw material. They are essentially produced during rasping of the potatoes and extraction of starch, resulting in a mixture of pulp (2%), potato juice (76%) rich in sugar and protein, and starch (20%). Proteins can be separated from potato juice by coagulation and used for animal feed. Potato juice is then concentrated and used as a fertiliser. Pulp is used for animal feed, but also for ethanol production. Production of dietary fibre has also been proposed.
Recovery and reuse of trimmings and pulps 421 16.2.6 Vegetable oil production
Vegetable oil production generates 15 million tonnes of waste every year. This process will be treated in Chapter 20.
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