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    • 4. 发明专利
    • CIRCULATING SYSTEM FOR PURIFYING WATER AREA
    • JPH03238094A
    • 1991-10-23
    • JP22343290
    • 1990-08-24
    • TAKENAKA KOMUTEN CO
    • SHINOZAKI MAMORUKAYANO HIDENORITAMURA KENJINAKAKUKI YASUHIDE
    • C02F3/32C02F7/00
    • PURPOSE:To obtain an effective way to purify the entire water areas of lakes and marshes which receive waste water from the peripheral regions but cannot flow the water out through rivers or waterway by a method wherein water is drawn up from the lakes and marshes and supplied through a catalytic oxidation waterway into a water area for aquatic plant cultivation and jets of oxygen are applied into the water. CONSTITUTION:The inlet of a water area A is formed in a water area B for aquatic plant cultivation having an aeration device E installed therein and the boundary between the water areas A and B is set by a water-passable defining structure C. The water is flowed from a location sufficiently distant from the cultivation water area B through a downflow type catalytic oxidation waterway into the cultivation water area B. The water is desalted by the absorption of nutritive salt by the aquatic plant and sent back into the water area A and a circulation of the water is thus produced between these water areas to gradually decrease the concentration of the nutritive salt in the entire water areas, whereby the water can be purified gradually. By applying jets of oxygen into the cultivation water area, moreover, the nutritive salt is supplied sufficiently for absorption by the surface layer of pleuston and its absorbing power can be maintained at a satisfactory level.