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Affiliation(s)

Research Institute, University of Tamagawa, Tokyo 194-0041, Japan

ABSTRACT

The treated sewage has a color as well as odor and is difficult to reuse. Physical methods to reduce color with odor are costly and more difficult to reuse. Since the color and odor were reduced by pellet-type bioreactor sewage treatment using humus, rice was cultivated for 3 years. Industrially, 3 years is sufficient to investigate the stability of treatment facilities, but when biological treatment is applied, 5 to 10 years of investigation is required. In addition, in rice cultivation, a similar 5 to 10 years survey is required to investigate the accumulation of low-concentration pollutants. This report is a five-year report and is the result of paddy rice cultivation in a stable wastewater treatment facility. The cultivated rice fully satisfied the edible standards and was able to obtain safe rice, and the effect of reducing fertilizer applied was obtained by using nitrogen and phosphorus from the treated water. In addition, the yield was able to be within the range of the standard yield of 500 kg to 550 kg/1,000 m2.

KEYWORDS

Water reuse, odor reduce, color reduce, bio-reactor, rice production.

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