Study on the elution of biostimulant for in-situ bioremediation of contaminated coastal sediment

Woo, Jung-Hui; Song, Young-Chae; Senthilkumar, Palaninaicker

Journal of Navigation and Port Research 2014;38(3):239-246.
Published online June 30, 2014.

오염된 연안저질의 현장생물정화를 위한 미생물활성촉진제의 용출특성 연구

우정희, 송영채, 센틸쿠마르

Study on the elution of biostimulant for in-situ bioremediation of contaminated coastal sediment

Jung-Hui Woo, Young-Chae Song, Palaninaicker Senthilkumar

Abstract

A study on the elution characteristics of biostimulating agents (sulfate and nitrate) from biostimulants which are used for in-situ bioremediation for the coastal sediment contaminated with organic matter was performed. The biostimulating agents were mixed with the coastal sediment, and then massed the mixture into ball. Two kinds of ball type biostimulant were prepared by coating the ball surface with two different polymers, cellulose acetate and polysulfone. A granular type biostimulant (GTB) was also prepared by impregnating a granular activated carbon in the biostimulating agent solution. The image of scanning electron microscopy for the biostimulant coated with cellulose acetate (CAB) showed that the inner side of the coating layer consisted of irregular and bigger size of pores, and the surface layer had tight structure like beehive. For the biostimulant coated with polyfulfone (PSB), the whole coating layer had a fine structure without pore. The elution rate of the biostimulating agents for the CAB was higher than that for the PSB, and the elution rate for the GTB was considerably higher than that for the PSB in distilled water as well as in sea water. The elution rate of the biostimulating agents in turbulent water flow was about 3 times higher than that in standing water, and the elution rate of nitrate was higher than that of sulfate from the stimulating agents.

Key Words: 용출율 Biostimulating agent;Coastal sediment;Polymer coating;elution rate