Using sweet potato by-products in animal feeding may help to alleviate their environmental burden, as these products are often disposed of in landfills or bodies of water (Akoetey et al., 2017). For example, sweet potato starch production is a major environmental concern in China and Japan as about 6 m3 of wastewater with a high chemical oxygen demand are yielded per ton of sweet potato tuber processed. Disposal of this water is problematic in that it has a high chemical oxygen demand (Xu et al., 2014).
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