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

为了开发滩涂生态单元的营造技术，降低氮磷负荷，实现污水处理后的高效利用，本研究对滩涂生态单元的自我净化功能进行了研究，研究了潮滩营养盐循环和反硝化作用以及海藻床对营养盐的吸收分析了填料载体孔隙率对处理后污水中营养物质去除能力的影响。根际微生物的硝化和反硝化作用对氮的去除具有重要作用，在适当的孔隙度和水面负荷条件下，根际微生物的硝化和反硝化作用可以同时进行。磷的去除主要是通过载体的吸附作用进行的。因此，低孔隙率的载体具有较高的去除效率。2）潮滩 关于我们 评价了东京内湾护岸的ved。在护岸距离192 km处，附着动物每天净化有机物19 t-COD，相当于东京港排放COD的23%。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。当河水因降雨而增加时，由于结构问题，加塞人工海滩的水质变成了低盐度，部分双壳类动物死亡。3）海藻床霍氏马尾藻的营养吸收率在5月至6月期间达到最高，此时生长率也最高。我们可以建立营养吸收率方程，该方程是生长阶段、营养浓度、光照强度和温度。结果表明，S. horneri对松岛湾营养盐循环的影响。色葡萄5月份，霍纳里底吸收了约70%的营养盐入流负荷，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