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A Challenge of Water Purification in Dokai Bay, Japan

机译:日本道海湾的净水挑战

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A history of water pollution and countermeasures for water purification in Dokai Bay, Japan are reviewed. Now, Dokai Bay suffers from the occurrences of red tides and oxygen-deficiency in summer. In order to prevent the occurrences of red tides and oxygen-deficiency, an ecological numerical model has been developed. The model experiments forecast that when the phosphorus or nitrogen load from land will be cut by 90% or 95%, respectively, red tides and oxygen-deficiency will not occur in Dokai Bay. If the industrial and sewage facilities are not sufficient to cut the nutrients load to the necessary degree, we have to consider other countermeasures such as cultivating bivalves and algae in order to decrease the nutrients concentration in the bay. International co-operation related to coastal zone management is also discussed.
机译:回顾了日本道海湾的水污染历史和净水对策。现在,Dokai海湾在夏天出现红潮和缺氧症。为了防止赤潮和缺氧的发生,已经开发了生态数值模型。模型实验预测,当陆地上的磷或氮负荷分别减少90%或95%时,杜凯湾将不会出现赤潮和缺氧现象。如果工业和污水处理设施不足以将养分负荷削减到必要的程度,我们必须考虑采取其他对策,例如种植双壳类和藻类,以减少海湾中的养分浓度。还讨论了与沿海地区管理有关的国际合作。

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