SEDIMENT IMPROVEMENT MATERIALS COMPARISON APPLIED TO EUTROPHICATED SEASIDE PARK POND

Abstract

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 to assess its effect. T-N in pore water showed the low concentration
with sprinkling shells as regional unused resources, because NH4-N eluted from sediment into water by the
influence of sprinkled CaO. T-P in pore water also showed the low concentration with sprinkling shells, and
moreover it was remarkable that in burning-treated system more than in non-treated system. By sprinkling,
Ca3(PO4)2 was formed with Ca2+ and PO4
3- bonding on the shell surface, and PO4-P in the pore water
decreased. NH4-N and T-N showed the negative adsorption isotherm, because 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.