Producing Rinse-Free Rice by the Bran-Grind Method: A Way to Stop Environmental Pollution From Rice Industry Waste Water

Abstract

Introduction: Removing the bran from the surface of polished rice is important for taste and palatability. However, rice washing waste water contains rich microbial nutrients, such as phos-phate and nitrogen, which causes water pollution through the overgrowth of algae and bacteria.
Methods: Rinse-free rice made by the bran grind (BG) method is an effective solution to this problem. The principle is to make bran aggregates by taking advantage of the adhesive proper-ties of “hadanuka” present on the surface of white rice. There is no waste water produced in the manufacturing process, and the bran by-product can be used as fertilizer or animal feed.
Results: The BG method therefore contributes to sustainable agriculture and to the prevention of water pollution.
Conclusion: Currently, rinse-free rice made by the BG method accounts for more than 70% of the rinse-free rice market.