유해 남세균 유래 마이크로시스틴의 위해성과 제거 방안 고찰
Review on hazardous microcystins originating from harmful cyanobacteria and corresponding eliminating methods
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초록
수자원의 부영양화와 인위적인 수변환경 조성 및 기후 변화의 영향으로 인한 유해 남세균의 대발생의 빈도와 강도가 증가하고 있다. 유해 남세균은 시아노톡신 (Cyanotoxins)을 배출하여 수자원의 안전뿐 아니라 생태계에 악영향을 주기 때문에 국제적인 환경문제로 관심을 받고 있다. 특히, 독성이 강한 마이크로시스틴 (microcystins, MCs)의 제거를 위한 연구가 가장 활발히 연구되어 왔으며 이를 위한 다양한 수처리 방법이 제안되고 있다. 본 논문에서는 기존에 보고된 마이크로시스틴 제거를 위한 기술 중 경제적, 효율적인 방안으로 평가받고 있는 흡착기술 (adsorption)에 대하여 주안점을 두고 조사하였다. 활성탄 (activated carbons)은 마이크로시스틴 제거를 위한 흡착소재로 가장 광범위하게 활용되고 있으며 우수한 마이크로시스틴 흡착성능이 보고되고 있다. 바이오차 (biochar), 생체흡착소재 (biosorbents)와 같은 활성탄을 대체하는 흡착소재의 활용 연구도 진행되고 있으나 활성탄에 비하여 그 효과가 미흡한 실정이다. 이러한 마이크로시스틴 흡착에는 흡착소재의 특성 (기공 특성과 표면화학적 특성)과 환경인자 (용액의 pH, 온도, 자연 유기물 및 이온성 물질)가 영향을 미치는 것으로 보고되고 있으며 이에 대한 고찰을 진행하였다. 또한, 보다 효과적인 제어를 위하여 용존 마이크로시스틴의 제거뿐 아니라 유해 남세균의 직접적인 제거를 위한 흡착기술의 활용 가능성도 확인하였다. 하지만, 마이크로시스틴의 제거를 위한 실질적인 흡착소재의 활용을 위해서는 실제 환경조건에서 적용과 환경적, 경제적인 관점에서의 최적화 연구가 필요하다고 판단된다. 본 논문은 체계적인 자료 조사 및 분석을 통하여 향후 마이크로시스틴의 제거를 위한 효과적인 흡착소재 및 적용방법의 개발 및 선별에 관한 통찰을 제시할 수 있을 것이다.
Abstract
Cyanobacterial harmful algal blooms (Cyano-HABs) are an international environmental problem that negatively affects the ecosystem as well as the safety of water resources by discharging cyanotoxins. In particular, the discharge of microcystins (MCs), a highly toxic substance, has been studied most actively, and various water treatment methods have been proposed for this purpose. In this paper, we reviewed adsorption technology, which is recognized as the most feasible, economical, and efficient method among suggested treatment methods for removing MCs. Activated carbons (AC) are widely used adsorbents for MCs removal, and excellent MCs adsorption performance has been reported. Research on alternative adsorption materials for AC such as biochar and biosorbents has been conducted, however, their performance was lower compared to activated carbon. The impacts of adsorbent properties (characteristics of pore surface chemistry) and environmental factors (solution pH, temperature, natural organic matter, and ionic strength) on the MCs adsorption performance were also discussed. In addition, toward effective control of MCs, the possibility of the direct removal of harmful cyanobacteria as well as the removal of dissolved MCs using adsorption strategy was examined. However, to fully utilize the adsorption for the removal of MCs, the application and optimization under actual environmental conditions are still required, thereby meeting the environmental and economic standards. From this study, crucial insights could be provided for the development and selection of effective adsorbent and subsequent adsorption processes for the removal of MCs from water resources.
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