Federal University of Ceara - DEHA, Bloco 713 - 1, Andar CEP 60451-970, Brazil.
Water Company of Ceara (CAGECE), Av. Dr. Lauro Vieira Chaves, 1030 - Vila União, Fortaleza, CE CEP 60.420-280, Brazil.
Water Res. 2016 Jan 1;88:558-565. doi: 10.1016/j.watres.2015.10.048. Epub 2015 Oct 28.
Many different species of cyanobacteria capable of producing saxitoxins have been identified as a threat to the safety of drinking water supplies worldwide. Removal of these contaminants can be accomplished by adsorption on granular activated carbon (GAC) but little is yet known about the kinetics of this process. This research investigated adsorption kinetics and diffusion behaviour of decarbomoyl saxitoxin (dc-STX) and carbamate saxitoxin (STX) on a GAC sample and simulated a full-scale GAC filter using batch experimental data and the homogeneous surface diffusion model (HSDM). HSDM was able to successfully describe batch adsorption of STX and dc-STX onto GAC sample and the surface diffusion coefficient was identified as the main adjustment parameter for this model. Different scenarios of STX and dc-STX removal in a GAC filter were simulated, offering engineers and scientists an option for the design of GAC full-scale filters, bench or pilot-scale experiments.
已鉴定出许多能够产生石房蛤毒素的蓝藻物种，它们对全球饮用水供应的安全构成了威胁。这些污染物可以通过颗粒活性炭（GAC）吸附去除，但人们对这一过程的动力学还知之甚少。本研究利用间歇实验数据和均相表面扩散模型（HSDM）调查了脱甲酰基石房蛤毒素（dc-STX）和氨基甲酸酯石房蛤毒素（STX）在 GAC 样品上的吸附动力学和扩散行为，并模拟了全规模 GAC 过滤器。HSDM 能够成功描述 STX 和 dc-STX 在 GAC 样品上的间歇吸附，表面扩散系数被确定为该模型的主要调整参数。模拟了 GAC 过滤器中 STX 和 dc-STX 去除的不同情况，为工程师和科学家提供了设计 GAC 全规模过滤器、台架或中试规模实验的选择。
