Development of creation technology of tidal flat blotope for reduction of nitrogen and phosphorus loads and efficient use of treated sewage

为了开发减少氮磷负荷和有效利用处理后污水的潮滩生物群落创建技术，我们研究了潮滩的自净化功能，如芦苇湿地的养分吸收、潮滩的养分循环和反硝化以及海藻床的养分吸收。本研究结果总结如下：1)芦苇湿地分析了填料孔隙率对污水中营养物去除能力的影响。根际微生物的硝化和反硝化作用对脱氮至关重要，在适当的孔隙率和水表面负荷条件下，硝化和反硝化反应同时发生。除磷主要通过吸附载体进行。因此，低孔隙率的载体具有较高的去除效率。评价了东京内海湾护岸中附着动物的净化作用。在驳岸距离192km处，附着动物对有机物的净化量为19t-COD/d，相当于从东京流出的COD的23%。分析了影响开赛人工海滩大型底栖动物生物量和种类变化的环境因子。底栖生物在降雨期间受到破坏。这是由于河水的流入和滞留。开赛人工滩在雨水增加后，由于结构问题，水质呈低盐度，双壳类动物死亡。5 ~ 6月是马尾藻营养物吸收率最高的季节，也是生长速率最高的季节。我们可以建立营养物吸收率与生长阶段、营养物浓度、光照强度和温度的函数方程。研究了霍氏梭菌对松岛湾营养物的吸收对营养物循环的影响。5月黑貂床吸收了70%左右的养分流入负荷，对改善水质有很大贡献。少

In order to develop a creation technology of tidal flat biotope for reduction of nitrogen and phosphorus loads and efficient use of treated sewage, we studied on the self-purification function of tidal flats, such as nutrients uptake by reed wetland, nutrients cycle and denitrification in tidal flat and nutrients uptake by seaweed bed.The results of this study are summarized as follows.1) Reed wetlandThe effect of porosity of the filling carrier on removal capability of nutrients from treated sewage was analyzed. Nitrification and denitrification by the rhizosphere microorganism were important for the nitrogen removal, and the simultaneous reaction of nitrification and denitrification occurred under appropriate conditions of porosity and water surface loading. The removal of phosphorus was mainly carried out by the adsorption to the carrier. Therefore, high removal efficiency was obtained by the carrier with low porosity.2) Tidal flatThe purification function of attached animal that li … More ved for the revetment of the Tokyo inner bay was evaluated. The attached animal purified organic matter of 19t-COD/day at revetment distance of 192km, and this value corresponded to 23% of COD that flows from Tokyo.The environment factors concerning fluctuations of biomass and species of macrobenthos inhabiting in the Kasai artificial beach were analyzed. The benthos was damaged in the rainfall time. It was due to the inflow and retention of river water. When the river water had been increased by rainfall, the water quality in Kasai artificial beach became a low salinity by the structural problem, and some kinds of bivalve died.3) Seaweed bedThe nutrient uptake rate of Sargassum horneri became the highest from May to June in which the growth rate was also the highest We could make the equation of the nutrient uptake rate which was the function of growth stage, nutrient concentration, illumination intensity and temperature. The effect of nutrients uptake by S. horneri on the nutrients cycle of Matsushima Bay was evaluated. The S. horneri bed in May absorbed about 70% of the nutrients inflow load, and it greatly contributes to improving water quality. Less