COMPARATIVE EXPERIMENT OF SEDIMENTS IMPROVEMENT MATERIAL IN TIDAL URBAN RIVER

Abstract

 In the tidal area of urban river, Sludge will accumulate on river bed caused by the inflow of untreated sewage water. Dissolved oxygen decrease to a low level and elution of nutrient occurred at the river bed. This study found this problem in Nihonbashi River. The author using 4 types of improving sediment materials for improving an effect of dissolved oxygen consumption and nutrient elution. Dissolved oxygen consumption and nutrient elution rate were calculated and compared by lab batch experiments with the acrylic cylindrical column. The result of the experiment are granulated coal ash and sand covered were suppressed on dissolved oxygen consumption and nutrient elution. Iron charcoal was most suppressed on nutrient elution about DTP. However, it was not suppress on dissolved oxygen consumption.