Abstract
Cause of eutrophication in Hasunuma Seaside Park Pond is nutrients that accumulated in the sediment bottom. This study was aimed to analysis the influence on bottom sediment environment by sprinkling shell as regional unused resources. In addition, adsorption isotherm was calculated by culture experiments of bottom sediment material improvement. And adsorption effect of the nutrient in each processing was assessed. By result of pore water, T-N in pore water showed the low concentration by sprinkled shells as regional unused resources. T-P in pore water showed the low concentration by sprinkled shells, and moreover it was remarkable in burning-treated system more than in non-treated system. By assessment by adsorption isotherm, NH4-N and T-N showed the negative adsorption isotherm. As reason for this, NH4-N eluted in water by sprinkled bottom sediment improvement materials, and nitrogen in the pore water decreased. For T-P and PO4-P, all bottom sediment improvement materials showed positive adsorption effects. CRM treatment using CaO showed the highest effect.
