입상활성탄에 의한 합성폐수의 용존유기물질의 새로운 흡착등온 모델 및 운동학적 흡착 연구

국문 초록 (Abstract)

본 논문은 입상활성탄에 의해서 합성폐수에서의 용존유기탄소의 흡착평형과 회분식 실험을 통해 흡착성질을 파악하 고자 하였다. 흡착평형의 새로운 모델식을 제안하였고 이 식을 바탕으로 회분식 실험데이터를 모사하였다. 합성폐수의 유기 성분은 Beef extract, Peptone, Humic acid, Tannic acid, Sodium lignin sulfonate, Sodium lauryle sulfate, Arabic gum powder, Arabic acid (polysaccharide), (NH₄)2SO₄, K2HPO₄, NH₄HCO₃, MgSO₄?7H₂O 등으로 구성되었다. 농도가 낮은 영역 (0∼2.5 mg/L)에서는 선형적인 흡착평형을 보여주었고, 농도가 높은 영역 (2.5∼6mgl/L)에서는 우호적인 흡착평형을 보여주 었다. 사용되어진 생물학적 처리방법에서 나오는 유출수의 합성폐수는 알려진 양으로 준비되어졌다. 흡착평형 모델링은 Freundlich, Langmuir, Sips 및 하이브리드 식을 이용하여 모사하였다. 특히, 선형과 Sips를 이용한 하이브리드 흡착평형식은 낮은 농도와 높은 농도 역에서 매우 좋은 흡착평형식이었다. 용수 및 폐수처리에 활성탄 흡착에 있어서, 선형식과 Sips식을 합친 새로운 하이브리드 식은 새로운 흡착평형식이 될 수 있었다. 하이브리드 흡착평형식 (선형+Sips)을 이용하여 LDFA 운동학적식을 통하여 다양한 흡착제 양에 따른 회분식 반응조에서의 실험데이터를 잘 모사할 수 있었다.

다국어 초록 (Multilingual Abstract)

In this study, we conducted the adsorption equilibrium and batch experiments of dissolved organic carbon (DOC) in the wastewater by granular activated carbon (GAC). The components of organic compound were Beef extract (1.8 mg/L), Peptone (2.7 mg/L), Humic acid (4.2 mg/L), Tannic acid (4.2 mg/L), Sodium lignin sulfonate (2.4 mg/L), Sodium lauryle sulfate (0.94 mg/L), Arabic gum powder (4.7 mg/L), Arabic acid (polysaccharide) (5.0 mg/L), (NH₄)2SO₄ (7.1 mg/L), K2HPO₄ (7.0 mg/L), NH₄HCO₃ (19.8 mg/L), MgSO₄?7H₂O (0.71 mg/L), The adsorption characteristics of DOC in synthetic wastewater was described using the mathematical model through a series of isotherm and batch experiments. It showed that there was linear adsorption region in the low DOC concentration (0∼2.5 mg/L) and favorable adsorption region in high concentration (2.5∼6 mg/L). The synthetic wastewater used was prepared using known quantities of organic and/or inorganic compounds. Adsorption modelling isotherms were predicted by the Freundlich, Langmuir, Sips and hybrid isotherm equations. Especially, hybrid isotherm of Linear and Sips equation was a good adsorption equilibrium in the region of the both the low concentration and high concentration. In applying carbon adsorption for treating water and wastewater, hybrid adsorption equation plus linear equation with Sips equation will be a good new adsorption equilibrium model. Linear driving force approximation (LDFA) kinetic equation with Hybrid (linear+Sips) adsorption isotherm model was successfully applied to predict the adsorption kinetics data in various GAC adsorbent amounts.

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