WATER POLLUTION AND RESTORATION IN OSAKA BAY; HISTORICAL REVIEW AND SCIENTIFIC EVALUAION OF POLICIES OF AREA-WIDE TOTAL POLLUTANT LOAD CONTROL

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  • NAKATSUJI Keiji
    社団法人 土木学会 大阪大学大学院 工学研究科土木工学専攻
  • HAN Donjin
    社団法人 土木学会 (株) ハイドロソフト技術研究所
  • YAMANE Nobuyuki
    社団法人 土木学会 (株) 建設技術研究所大阪支社

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Other Title
  • 大阪湾における汚濁負荷量の総量規制施策が水質保全に与えた効果の科学的評価
  • オオサカワン ニ オケル オダク フカリョウ ノ ソウリョウ キセイ シサク ガ スイシツ ホゼン ニ アタエタ コウカ ノ カガクテキ ヒョウカ
  • Water pollution and restoration in Osaka Bay; historical review and scientific evaluation of policies of area-wide Total pollutant load control (in Japanese)

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Abstract

During the period from 1960s to mid-1970s, problems of water pollution became more widely and severe with rapid economic growth in Japan. A system of Area-wide Total Pollutant Load Control has been established to restrict the quantity of organic pollutants discharged from land areas. COD was used as an indicator and reduction target. In the present study, an aquatic ecosystem model was applied to evaluate the effects of such control on the water quality conservation in Osaka Bay from 1950 to 2020. The results suggest that the load control should be expanded to include not only COD but nitrogen and phosphorus as well, because both nutrients cause internal production of COD.

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