| 摘要 |
PURPOSE: Provided is a polluted lake water pretreatment system using aquatic plants so as for clay not to be introduced into a natural purification system. CONSTITUTION: The system comprises an aquatic plant zone(1) installed at a side of a cross bar under water, and a weir(2) provided at a side of a lake or a river having a height lower than the cross bar so as for the lake water to overflow the weir(2) to the aquatic plant zone(1), wherein the aquatic plant zone(1) has a gravel layer, a pebble layer and a sand filter layer which are stacked in order from the bottom thereof, aquatic plants planted in the sand filter layer, a perforated pipe(3) with a plurality of holes buried in the gravel layer in the aquatic plant zone(1), a drain pipe(6) connected to the perforated pipe(3), and a back washing pipe(5) buried in the aquatic plant zone(1) for washing out clay deposited in the aquatic plant zone(1).
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