ENVIRONMENTAL CONDITION INDEX FOR ESTIMATION ON EUTROPHIC STATE OF ENCLOSED AQUIFER ECOSYSTEM

To evaluate the effect of sediment treatment on aquifer ecosystem, a new ecological index that is composed of water quality, sediment quality and biota quantity was proposed in this study. According to ECI (Environmental Condition Index), DAF treatment (Dissolved Air Flotation) + MgO sprinkling was assessed as the most efficiency method for improvement of eutrophicated ecosystem, that is, this method can make the organic matter quantity in aquatic ecosystem minimum level in comparison with other sediment treatment method. Also, for application of this method to real field remediation such as eutrophicated lake, marsh, reservoir and so on, more detailed analysis for treatment function and optimum condition of sediment treatment was considered to be necessary.