EVALUATION OF SAFETY AND THE BREWERY-RICE QUALITY CULTIVATED WITH SEWAGE TREATMENT WATER

Abstract

 The cultivation system for brewery-rice with treated wastewater was evaluated from the point of view from safety and the rice-quality. The harvested grain rice satisfied the required quality for brewing except for the protein content. Furthermore, the grain rice contains high potassium, which must lead to the good brewing for sake. For water quality, nitrogen and phosphorus were removed as much as 10-20% in the high-load period before mid-summer-drainage (MSD), 80-90% in the low-load period after MSD. In the paddy soil, harmful heavy metals were not accumulated after the experiment, while potassium was done.