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Clean Technology, Vol.23, No.1, 1-14, March, 2017
수용액으로부터 질산성질소 제거를 위한 기술
Separation Technologies for the Removal of Nitrate-Nitrogen from Aqueous Solution
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초록
높은 농도의 질산염을 포함하는 물은 인간의 건강을 위협하고 부영양화의 원인이 되기 때문에 제한 농도 이하로 처리되어야 한다. 그러나 질산염은 수용액에서의 높은 용해도로 인해 응집, 여과 및 침전과 같은 일반적인 처리공정으로는 제거가 거의 불가능하다. 따라서 흡착, 이온교환, 역삼투, 탈질과 전기투석과 같은 다른 기술이 질산염의 효과적인 제거를 위해 요구된다. 이들 각 기술은 비용, 수질 개선 정도, 잔류물 처리와 전처리 요구와 같은 인자의 비중에 따라 장점과 단점과 가능성을 가지고 있다. 흡착은 가격 효율성, 운전의 용이성과 설계의 간편성으로 가장 보편적으로 사용되는 공정이다. 흡착제의 표면개질은 질산이온 흡착능력을 개선하였다. 역전 전기투석과 역삼투의 질산-선택 멤브레인 공정은 수용액 중의 질산이온 제거에 오랜동안 많은 지역에서 효과적임이 증명되었다. 두 기술은 높은 농도의 폐기물을 생성하고 이것의 신중한 처분이 필요하다.
At high nitrate concentrations, water must be treated to meet regulated concentrations because it results in threat to human health and eutrophication of natural water. However, it is almost impossible to remove nitrate by conventional water treatment methods such as coagulation, filtration and precipitation, due to its high water solubility. Therefore, other technologies including adsorption, ion exchange, reverse osmosis, denitrification, and electrodialysis are required to effectively remove nitrate. Each of these technologies has their own strengths and drawbacks and their feasibility is weighted against factors such as cost, water quality improvement, residuals handling, and pre-treatment requirements. An adsorption technique is the most popular and common process because of its cost effectiveness, ease of operation, and simplicity of design. Surface modifications of adsorbents have been enhanced their adsorption of nitrate. The nitrate-selective membrane process of electrodialysis reversal and reverse osmosis have proven over time and at many locations to be highly effective in removing nitrate contaminating problems in aqueous solutions. Both electrodiaysis and reverse osmosis methods generate highly concentrated wastes and need careful consideration with respect to disposal.
Keywords:Nitrate-nitrogen removal;Adsorption;Electrodialysis reversal;Reverse osmosis;Biological denitrification
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