EFFECTIVENESS ASSESMENT OF NUTRIENT MANAGEMENT OPERATION AT SEWAGE TREATMENT PLANTS IN ISE-BAY

Abstract

 This study focuses on nutrient management operation at sewage treatment plants as a measure to improve biological productivity in the sea area. The effectiveness of the nutrient managements was evaluated using a numerical simulation model in Ise-bay where the amount of catch has decreased particularly in recent years. As a results, it was estimated that nutrient management operation could increase primary production, secondary production and clam resource. In order to reduce hypoxia and to regenerate of biological productivity simultaneously, it is necessary to implement conservation and restoration of habitats such as tidal-flats and seaweed-beds in conjunction with nutrient management operation.