Abstract

Lake Izunuma is a famous place for the coming of migrating flying swans. But, the leftovers of foods which were fed to the waterbirds and their droppings are one of the causes of water pollution.In order to prevent water pollution of Lake Izunuma, a feeding place system was constructed near the lake. It was reported in the previous reports that a build-up of pollutants were found in the feeding pond and the purification rates of 0.13 mg/l/day COD, 1.05×10-2 mg/l/day T-N and 0.53×10-3 mg/l/day T-P were obtained in a plant, Zizania latifolia, field (constructedwetland).In this paper, the results which obtained in the second year study were reported and as follows.1. The purification rates of 1.2-1.3×10-2 mg/l/day T-N and 0.68-1.03×10-3 mg/l/day T-P were obtained in a plant field (constructed wetland). These were larger than those of first year. These will be caused by the larger growth of the plant. On the other hand, the purification rate of COD was almost same to that of first year.2. The unit loading factors of 5.30 g/swan-day T-COD, and 0.49 g/swan-day T-TN due to the coming of migrating flying swans were obtained.

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