Arsenite Removal from Simulated Groundwater by Biogenic Schwertmannite: A Column Trial

XIE Yue; ZHOU Li-Xiang

摘要

To assess the feasibility of biogenic schwertmannite to act as a sorbent for removing arsenite from groundwater,a series of biogenic schwertmannite-packed column adsorption experiments were conducted on simulated As(Ⅲ)-containing groundwater.Empty bed contact time (EBCT),As(Ⅲ) concentration in effluent,and the removal efficiency of As(Ⅲ) through the column were investigated at pH 8.0 and temperature 25 ± 0.5 ℃.The results showed that the breakthrough curves were mainly dependent on EBCT values when the influent As(Ⅲ) concentration was 500 μg L-1 and the optimum EBCT was 4.0 min.When the effluent As(Ⅲ) concentration reached 10 and 50 μg L-1,the breakthrough volumes for the schwertmannite adsorption column were 4200 and 5600 bed volume (BV),with As(Ⅲ) adsorption capacity of 2.1 and 2.8 mg g-1,respectively.Biogenic schwertmannite could be regenerated by 1.0 mol L-1 NaOH solution,and more than 80％ of As(Ⅲ) adsorbed on the surface of schwertmannite could be released after 3 successive regenerations.The breakthrough volume for the regenerated schwertmannite-packed column still maintained 4 000-4 200 BV when the As(Ⅲ) concentration in effluent was below 10 μg L-1.Compared with other sorbents for As(Ⅲ) removal,the biogenic schwertmannitepacked column had a higher breakthrough volume and a much higher adsorption capacity,implying that biogenic schwertmannite was a highly efficient and potential sorbent to purify As(Ⅲ)-contaminated groundwater.

机译：为了评估生物施瓦特锰矿作为吸附剂去除地下水中砷的可行性，在模拟含砷（Ⅲ）的地下水上进行了一系列生物施瓦特锰矿填充柱吸附实验。空床接触时间（EBCT），As（研究了在pH 8.0和温度25±0.5℃下废水中Ⅲ）的浓度以及对As（Ⅲ）的去除效率。结果表明，进水As（Ⅲ）的穿透曲线主要取决于EBCT值。浓度为500μgL-1，最佳EBCT为4.0 min。当废水中As（Ⅲ）浓度达到10和50μgL-1时，Schwertmannite吸附柱的穿透体积为4200和5600床体积（BV），分别具有2.1和2.8 mg g-1的As（Ⅲ）吸附能力。1.0mol L-1 NaOH溶液可再生生物硅钙锰矿，并且可将80％以上的As（Ⅲ）吸附在硅藻土表面。连续3次恢复后释放当废水中的As（Ⅲ）浓度低于10μgL-1时，再生的Schwertmannite填充柱的突破体积仍保持4 000-4 200 BV。与其他吸附剂相比，生物成因schwertmannite填充柱具有更高的穿透体积和更高的吸附能力，这表明生物Schwertmannite填料是一种高效且潜在的吸附剂，可净化被As（Ⅲ）污染的地下水。

Arsenite Removal from Simulated Groundwater by Biogenic Schwertmannite: A Column Trial

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