오연해수로부터 질산염의 제거를 위한 개질 퇴적물의 흡착특성

Adsorption of nitrate from contaminated sea water with activated dredged sediment

  • 송영채 (한국해양대학교 토목환경공학부) ;
  • 우정희 (한국해양대학교 토목환경공학부) ;
  • 정은혜 (한국해양대학교 토목환경공학부) ;
  • 고성정 (한국해양수산 연구원 수산교육팀) ;
  • 김동근 (한국해양수산 연구원 수산교육팀) ;
  • 박인석 (한국해양대학교 해양환경 생명과학부)
  • Song, Young-Chae (Division of Civil and Environmental System Engineering, Korea Maritime University) ;
  • Woo, Jung-Hui (Division of Civil and Environmental System Engineering, Korea Maritime University) ;
  • Jung, Eun-Hye (Division of Civil and Environmental System Engineering, Korea Maritime University) ;
  • Go, Sung-Jung (Fisheries Education Team, Korea Institute of Maritime and Fisheries Technology) ;
  • Kim, Dong-Geun (Fisheries Education Team, Korea Institute of Maritime and Fisheries Technology) ;
  • Park, In-Seok (Division of marine environment and bioscience, Korea Maritime University)
  • 발행 : 2005.04.21

초록

연안 준설퇴적물을 열처리, 생물침출공정을 이용한 중금속처리, 중화처리 등의 다양한 방법으로 전처리 또는 개질한 재료를 이용하여 연안해수에 함유된 질산염의 흡착특성에 대한 실험실적 연구를 수행하였다. 개질된 퇴적물의 흡창평형시간은 생물침출-열처리 퇴적물이 17분으로 가장 빨랐으며 생물침출-중화-열처리 퇴적물과 함께 생물침출퇴적물이 각각 25분, 27분으로 황토와 열처리 황토에서의 33분, 32분 보다 빠르게 흡착되는 것으로 평가되었다. 시험된 재료들에 대한 흡착공정은 Freundlich 등온흡착식으로 해석할 수 있었으나, 흡착공정은 표면의 특성에 크게 영향을 받는 것으로 평가되었다. 질산염의 흡착량은 퇴적물과 열처리 퇴적물에서 각각 2.12, 2.19mg $NO_{3}$-N/g 으로 가장 많았으며 열처리 등으로 개질된 퇴적물은 연안해수의 수질개선을 위한 흡착제로서 활용가능한 것으로 평가되었다.

A laboratory study on the adsorption of nitrate contaminated in nearshore water using various materials including several types of dredged sediments(ST) and yellow clays(YC), which are activated by hear(HT), bioleaching for heavy metal removal(BL) and neutralization(NR) was performed. The equilibrium time of the adsorption for the sediment bioleached and treated by heat(BL-HT-ST) was only 17min. which was faster than the sediment bioleached, neutralized and treated by heat(BL-NR-HT-S) (25min) or the sediment treated by the bioleaching process(BL-ST)(27min), but longer equilibrium times for yellow clay(YC) or heat treated yello clay(HT-YC) were required. The adsorption processes of nitrate in sea water for tested material could be described by Freundlich isotherm, but were significantly affected by surface characteristics of the materials. The adsorption capacities for raw sediment and heat treated sediment were 2.12, 2.19mg $NO_{3}$-N/g, respectively, which were higher than others, indicating that the sediment activated by heat could be used as a material for the improvement of nearshore water quality.

키워드