WATER CLEANING METHOD AND EQUIPMENT UTILIZING PLANTING BASE PLATE

PROBLEM TO BE SOLVED: To provide a water cleaning method and equipment utilizing a planting base plate which is high in a root taking rate and is capable of stably maintaining high cleaning efficiency. SOLUTION: Fine-grained soil 15 which constitutes the planting base plates 10 is placed on a bottom wall 12 pierced with pores 13 through which root systems 17 of plants 26 can pass across middle-grained soil 14 larger than these pores 13. The planting base plate 10 is supported by immersing the bottom wall 12 in the water surface 4 and underwater pollutants are adsorbed and absorbed into the root systems 17 of the plants 16 grown in the water from the pores 13. Preferably a catalyst filter bed 6 for cleaning is arranged in the water below the planting base plate 10 to cause the root systems 17 of the plants 16 grown in the water from the planting base plate 10 to entangle with the filter bed 6. Further, preferably, the catalyst filter bed 6 for cleaning is disposed in the water in a channel-like waterway 2 so as to intersect with the longitudinal direction of the waterway and the planting base plate 10 is disposed on the water surface 4 on the filter bed 6 across the entire width of the waterway.