염화철(Ⅲ)과 염화아연 담지 활성탄의 질산성질소 제거효율 비교 (Comparative Study for Nitrate Removal by Iron Chloride(Ⅲ) and Zinc Chloride Treated Activated Carbon)

서지정보

· 발행기관 : 한국환경기술학회
· 수록지 정보 : 한국환경기술학회지 / 11권 / 2호 / 70 ~ 75페이지
· 저자명 : 유찬서, 정상철, 정정조, 이경동, 라덕관

초록

수중에 존재하는 질산성질소를 제거하기 위하여 염화철 처리 활성탄 및 염화아연 처리 활성탄을 사용하였다. 염화철 처리 활성탄 및 염화아연 처리 활성탄의 첨가량, pH, 온도를 변화시키면서 일반 활성탄과의 비교 실험을 수행하였다.
활성탄의 첨가량이 증가할수록 질산성질소를 흡착할 수 있는 표면적 및 세공면적이 증대됨에 따라 제거율도 증가하였다. 염화철 처리 활성탄과 염화아연 처리 활성탄은 일반 활성탄에 비하여 각각 30% 및 20%이상 제거율이 향상되었다. 염화철 처리 활성탄 및 염화아연 처리 활성탄의 흡착능은 각각 9.25mg/g과 8.25mg/g이었다.
pH는 활성탄 흡착의 영향인자지만 pH 변화에 따른 질산성질소 제거율은 큰 차이가 나타나지 않았다. 온도가 증가할수록 질산성질소의 제거율은 감소하는 경향을 나타냄으로써, 이 반응은 발열반응임을 확인할 수 있었다. 일반 활성탄은 10℃에서 53.8 %, 염화철 처리 활성탄은 10℃에서 96.2%, 염화아연 처리 활성탄은 10℃에서 82.1%의 가장 높은 질산성질소 제거율을 나타냈다. 염화철 및 염화아연 처리 활성탄의 흡착평형 시간은 60분 이었으며, 그때 질산성질소 제거율은 각각 94.6% 및 84.6%이었다. 흡착등온식은 Freundlich식이나 Langmuir식으로 표현이 가능하였다.

영어초록

In order to investigate the nitrate removal efficiency in natural water, a batch system was performed by using Iron chloride(Ⅲ) and Zinc chloride treated activated carbon. The experiment of nitrate adsorption, with pH, temperature, and dosage of Iron chloride(Ⅲ) and Zinc chloride treated activated carbon, was carried out with compare to the conventional activated carbon.
From the results, it was known that the nitrate removal efficiency was increased with a increment of activated carbon dosage, since it related to the increasing of surface area and porosity. The nitrate removal efficiencies were upgraded above 30% on Iron chloride(Ⅲ) treated activated carbon and above 20% on Zinc chloride treated activated carbon, comparing to it of conventional activated carbon. And the nitrate adsorption capacity was shown as 9.25 mg/L, 8.25 mg/L and 6.50 mg/L on each activated carbon.
Though the pH is known as an effective parameter to adsorption rate, the variation of pH on this experiment did not affect to nitrate adsorption rate. But water temperature was related to the efficiency. So it was determinated that this nitrate adsorption process was an exothermic reaction. The maximum nitrate adsorption rate at 10 ℃ was recorded as 96.2%, 82.1% and 53.8% in each activated carbon.
Additionally, the equilibrium time for adsorption was shown to be 60 minutes, and the nitrate removal efficiency at the time was recorded as 94.6%, 84.6% on each treated activated carbon. Adsorption isotherm for nitrate on Iron chloride and Zinc chloride treated activated carbon could be well described by Langmuir and Freundlich adsorption isotherm.

참고자료

· 없음