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Continuous fixed-bed column studies of arsenite removal via oxidation and adsorption coprocesses
Journal of Water Process Engineering ( IF 7 ) Pub Date : 2021-06-15 , DOI: 10.1016/j.jwpe.2021.102176
Pummarin Khamdahsag , Dickson Y.S. Yan , Pongnapa Poompang , Nichapa Supannafai , Visanu Tanboonchuy

Arsenite (As(III)) was removed via oxidation and adsorption coprocesses in fixed-bed columns. A manganese oxide octahedral molecular sieve (K-OMS2) and iron(III) trimesate (Fe-BTC) were applied as oxidizer and adsorbent, respectively. Before use in the column, K-OMS2 and Fe-BTC powders were coated on ceramic balls, with K-OMS2 and Fe-BTC to ceramic ball ratios of 1 to 50. The As(III) and arsenate (As(V)) removal efficiencies for single fixed-bed columns of K-OMS2 and Fe-BTC, respectively, as well as for the two columns combined, were determined. From the single-column run results, K-OMS2 maintained notable efficiency in oxidizing As(III) to As(V) during a three-round-use cycle, with leached Mn and K concentrations below the groundwater standard. The average As(III) oxidation percentages in K-OMS2 column for 600 min in the 1st, 2nd, and 3rd rounds were 95, 92, and 93%, respectively. In the Fe-BTC single-column run, the Yoon-Nelson model was found to represent the adsorption kinetics model of the run, with a maximum As(V) adsorption capacity of 52.60 mg/g, and more than 75% of As(V) was removed for 600 min. Maximum Fe leaching from Fe-BTC column was 0.23 mg/L, which was lower than Fe concentration range found in natural freshwater. The adsorption behavior can be explained by the fact that the adsorption rate decreased depending on the As(V) breakthrough and Fe-BTC proportion. In the case of two columns combined, more than 62% of the total As was removed over 2200 min of operation time under optimal experimental conditions.



中文翻译:

通过氧化和吸附协同过程去除亚砷酸盐的连续固定床柱研究

亚砷酸盐 (As(III)) 在固定床柱中通过氧化和吸附协同过程去除。氧化锰八面体分子筛 (K-OMS2) 和三甲磺酸铁 (III) (Fe-BTC) 分别用作氧化剂和吸附剂。在用于色谱柱之前,将 K-OMS2 和 Fe-BTC 粉末涂覆在陶瓷球上,K-OMS2 和 Fe-BTC 与陶瓷球的比例为 1 比 50。 As(III) 和砷酸盐 (As(V))分别测定了 K-OMS2 和 Fe-BTC 的单个固定床柱以及两个组合柱的去除效率。从单柱运行结果来看,K-OMS2 在三轮使用周期内将 As(III) 氧化为 As(V) 的效率显着,浸出的 Mn 和 K 浓度低于地下水标准。K-OMS2 柱中第 1、2、600 分钟的平均 As(III)氧化百分比 和第三轮分别是95%、92%和93%。在 Fe-BTC 单柱运行中,发现 Yoon-Nelson 模型代表了运行的吸附动力学模型,最大 As(V) 吸附容量为 52.60 mg/g,超过 75% 的 As(V) V) 被移除 600 分钟。Fe-BTC 柱最大 Fe 浸出量为 0.23 mg/L,低于天然淡水中的 Fe 浓度范围。吸附行为可以通过吸附速率降低的事实来解释,这取决于 As(V) 突破和 Fe-BTC 比例。在两根色谱柱组合的情况下,在最佳实验条件下,在 2200 分钟的运行时间内去除了总砷的 62% 以上。最大 As(V) 吸附容量为 52.60 mg/g,600 分钟去除超过 75% 的 As(V)。Fe-BTC柱最大Fe浸出量为0.23 mg/L,低于天然淡水中的Fe浓度范围。吸附行为可以通过吸附速率降低的事实来解释,这取决于 As(V) 突破和 Fe-BTC 比例。在两根色谱柱组合的情况下,在最佳实验条件下,在 2200 分钟的运行时间内去除了总砷的 62% 以上。最大 As(V) 吸附容量为 52.60 mg/g,600 分钟去除超过 75% 的 As(V)。Fe-BTC柱最大Fe浸出量为0.23 mg/L,低于天然淡水中的Fe浓度范围。吸附行为可以通过吸附速率降低的事实来解释,这取决于 As(V) 突破和 Fe-BTC 比例。在两根色谱柱组合的情况下,在最佳实验条件下,在 2200 分钟的运行时间内去除了总砷的 62% 以上。吸附行为可以通过吸附速率降低的事实来解释,这取决于 As(V) 突破和 Fe-BTC 比例。在两根色谱柱组合的情况下,在最佳实验条件下,在 2200 分钟的运行时间内去除了总砷的 62% 以上。吸附行为可以通过吸附速率降低的事实来解释,这取决于 As(V) 突破和 Fe-BTC 比例。在两根色谱柱组合的情况下,在最佳实验条件下,在 2200 分钟的运行时间内去除了总砷的 62% 以上。

更新日期:2021-06-18
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