| 摘要 |
PURPOSE:To purify sewage, by coating the surface of crystalline limestone with a coating material prepared by mixing a size material with magnetite to form a purifying material which is, in turn, accepted in a cage to be arranged to a water flow channel. CONSTITUTION:The surface of coarsely crushed crystalline limestone 1 is coated with a coating material 2 prepared by mixing a size material with magnetite or a magnetic powder and enhanced in close adhesiveness by a coating or spraying method to obtain a purifying material A which is, in turn, accepted in a cage 3 comprising a metal net to be arranged to a water flow channel 4. A flow speed sensor 5 is provided to the appropriate area of the water flow channel 4 to always impart a constant flow speed to the surface of the purifying material.
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