Journal of the Korean Society for Environmental Technology (한국환경기술학회지)

Korean Society for Environmental Technology (한국환경기술학회)
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Removal Capacity of Nitrate by Activated Carbon from Exhausted Coffee

커피찌꺼기로 제조한 활성탄의 질산성질소 제거능

  • Lee, Boo-Han (Dept. of Environmental Engineering, Sunchon National University) ;
  • Lim, Doo-Il (Dept. of Environmental Engineering, Sunchon National University) ;
  • Ra, Deog-Gwan (Dept. of Environmental Engineering, Sunchon National University)
  • 이부한 (순천대학교 환경공학과) ;
  • 임두일 (순천대학교 환경공학과) ;
  • 라덕관 (순천대학교 환경공학과)
  • Received : 2013.12.02
  • Accepted : 2014.02.07
  • Published : 2014.02.28
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Abstract

Several adsorption experiments were carried out by activated carbon that was manufactured from exhausted coffee, to find out removal characteristics of nitrate. The nitrate removal efficiency was increased with dosage rate of activated carbon or contact time for adsorption. The equilibrium state of nitrate adsorption was arrived after 120 minutes. At that time, the nitrate removal efficiency were determined to 59.0%, 86.0%, 90.0%, 91.0%, 95.0% on each activated carbon dosage of 10 g/L, 20 g/L, 30 g/L, 40 g/L, 50 g/L. And the nitrate removal efficiency had a tendency to increase with a round of neutral value of pH, such as 90.0% on pH 3, 92.0% on pH 6, 93% on pH8, 81.0% on pH 10. The fluctuation of temperature was a little effect to the increasing of nitrate removal efficiency; 80.0% on $2^{\circ}C$, 81.0% on $10^{\circ}C$, 85.0% on $20^{\circ}C$, 87% on $30^{\circ}C$. On the SEM images analysis, a lot of pores on surface of activated carbon from exhausted coffee were supplied as an adsorption space against to soluble nitrate.

커피찌꺼기로부터 제조한 활성탄을 이용하여 질산성질소의 제거율에 영향을 미치는 인자들에 대하여 실험하였다. 활성탄 주입량과 접촉시간이 증가함에 따라 질산성질소의 제거율이 증가하였다. 흡착평형은 접촉 시간 120분 후에 도달하였고, 그때 질산성질소의 제거율은 활성탄 주입량 10 g/L에서 59.0%, 20 g/L에서 86.0%, 30 g/L에서 90.0%, 40 g/L에서 91.0%, 50 g/L에서 95.0%를 나타내었다. pH가 중성화됨에 따라 질산성질소의 제거율이 증가하는 경향을 나타내었고, 질산성질소의 제거율은 pH 3에서 90.0%, pH 6에서 92.0%, pH 8에서 93.0%, pH 10에서 81.0%를 나타내었다. 온도가 증가함에 따라 질산성질소의 제거율은 증가하는 경향을 나타내었고, 온도 $2^{\circ}C$에서 80.0%, $10^{\circ}C$에서 81.0%, $20^{\circ}C$에서 85.0%, $30^{\circ}C$에서 87%의 질산성질소 제거율을 나타내었다. SEM 분석에서 커피찌꺼기가 갖는 표면상의 섬유구조를 확인하였고, 활성탄이 질산성질소의 흡착과정을 거친 후에는 흡착제 표면에 질산성질소가 흡착되어 있는 것이 확인되었다.

Keywords

References

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