Center for Water Resource Cycle, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea.
Center for Water Resource Cycle, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea; School of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
Chemosphere. 2018 Feb;193:883-891. doi: 10.1016/j.chemosphere.2017.11.092. Epub 2017 Nov 20.
Microcystin-LR (MC-LR) is a growing issue as it is toxic and difficult to remove in drinking water treatment plants (DWTPs). Mesoporous carbon (MC) is evaluated as an alternative adsorbent for MC-LR removal and compared with three widely-used powdered activated carbons (PACs). MC was more favorable for MC-LR removal than PACs. MC-LR adsorption on MC was a rapid process (k = 1.02 × 10 g/μg/min) that completed within 15 min, while adsorption on PACs took 60 min. The maximum adsorption capacity of MC-LR was 18,008 μg/g (MC), which was higher than that of the PACs. Two mechanisms were associated with adsorption: the small hydro-dynamic diameter of MC in an aqueous solution increased the instantaneous attraction of MC-LR to its surface, and the numerous mesopores enhanced pore diffusion. The MC could remove MC-LR to meet the drinking water guidance level (1 μg/L) from an the MC-LR concentration range of 5-20 μg/L in drinking water sources, and 10 min of treatment was sufficient to meet this level (MC dose = 20 mg/L). The field-scale DWTP was operated by adding 1 or 5 mg/L MC to the mixing basin, and 49.49% and 74.50% of MC-LR was removed, respectively. Geosmin and 2-methylisoborneol were slightly reduced when 5 mg/L of MC was applied.
微囊藻毒素-LR（MC-LR）是一个日益严重的问题，因为它在饮用水处理厂（DWTP）中具有毒性且难以去除。介孔碳（MC）被评估为替代吸附剂，用于去除 MC-LR，并与三种常用的粉末状活性炭（PAC）进行比较。MC 比 PAC 更有利于 MC-LR 的去除。MC-LR 在 MC 上的吸附是一个快速过程（k=1.02×10g/μg/min），在 15 分钟内完成，而在 PAC 上的吸附需要 60 分钟。MC-LR 的最大吸附容量为 18,008μg/g（MC），高于 PAC。两种机制与吸附有关：水溶液中 MC 的小水动力学直径增加了 MC-LR 对其表面的瞬间吸引力，并且众多的中孔增强了孔扩散。MC 可以去除 MC-LR，使其在饮用水源中从 5-20μg/L 的 MC-LR 浓度范围内达到饮用水指导水平（1μg/L），并且 10 分钟的处理时间足以达到这一水平（MC 剂量=20mg/L）。在现场规模的 DWTP 中，通过在混合池中添加 1 或 5mg/L 的 MC 进行操作，分别去除了 49.49%和 74.50%的 MC-LR。当添加 5mg/L 的 MC 时，土臭素和 2-甲基异莰醇的含量略有降低。
