Haaning Nielsen Asbjørn, Lens Piet, Vollertsen Jes, Hvitved-Jacobsen Thorkild
Section of Environmental Engineering, Department of Life Sciences, Aalborg University, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark.
Water Res. 2005 Jul;39(12):2747-55. doi: 10.1016/j.watres.2005.04.048.
Interactions between iron and sulfide in domestic wastewater from a gravity sewer were investigated with particular emphasis on redox cycling of iron and iron sulfide formation. The concentration ranges of iron and total sulfide in the experiments were 0.4-5.4mgFeL(-1) and 0-5.1mgSL(-1), respectively. During anaerobic conditions, iron reduction kinetics were investigated and reduction rates amounted on average to 1.32mgFeL(-1)d(-1). Despite the very low solubility of iron sulfide, the reduced iron reacted only partly with sulfide to produce iron sulfide, even when dissolved sulfide was in excess. When a ferric chloride solution was added to sulfide containing anaerobic wastewater, the ferric iron was quickly reduced to ferrous forms by oxidation of dissolved sulfide and the ferrous iron precipitated almost completely as iron sulfide. During aerobic conditions, iron sulfide was oxidized with a half-life period of 11.7h. The oxidation rate of iron sulfide was significantly lower than that reported for the oxidation of dissolved sulfide.
研究了重力下水道中生活污水中铁与硫化物之间的相互作用，特别关注铁的氧化还原循环和硫化铁的形成。实验中铁和总硫化物的浓度范围分别为0.4 - 5.4mgFeL(-1)和0 - 5.1mgSL(-1)。在厌氧条件下，研究了铁的还原动力学，还原速率平均为1.32mgFeL(-1)d(-1)。尽管硫化铁的溶解度极低，但即使溶解的硫化物过量，还原态的铁也只是部分与硫化物反应生成硫化铁。当向含硫化物的厌氧废水中加入氯化铁溶液时，三价铁通过溶解硫化物的氧化迅速还原为二价铁形式，二价铁几乎完全以硫化铁的形式沉淀。在好氧条件下，硫化铁被氧化，半衰期为11.7小时。硫化铁的氧化速率明显低于溶解硫化物氧化的报道速率。
