作　　者： ; ; ;

机构地区： 南京农业大学资源与环境科学学院环境工程系

出　　处： 《南京农业大学学报》 2013年第2期97-102,共6页

摘　　要： 采用摇瓶试验,研究了晶种(先前合成的黄铁矾)和钾离子在生物成因黄铁矾合成中的作用及其影响机制。结果表明:2种材料均能明显促进Fe3+水解形成黄铁矾沉淀。在起始Fe2+浓度为160 mmol.L-1,晶种和K+最大添加量分别为10g和80 mmol.L-1时,经过72 h反应后,溶液中的总铁(TFe)分别比对照多沉淀了23和33 mmol.L-1。K+在黄铁矾形成中起阳离子诱导作用,晶种起晶核刺激作用。K+的促进作用主要发生在24～48 h,但在低Fe3+浓度下作用有限;而晶种可以减少低Fe3+浓度对黄铁矾形成的不利影响。结论:晶种和K+共同作用不仅能够明显促进Fe3+的水解沉淀,而且绝大部分反应发生在0～24 h,极大地缩短了反应时间。 The effects of crystal seed, i. e. , already-formed jarosite, and K＋ on the formation of fresh jarosite facilitated by Acidithiobacillus ferrooxidans in 160 mmol·L^-1 FeSO4 solutions were investigated through batch experiments. Results showed that both the rate and extent of Fe3＋ precipitation increased with the increase of the amount of the two materials added. Compared to the control without addition of crystal seed and K＋,the treatments with 10 g seed and 80 mmol·L ^-1 K＋ increased the removal of total iron by 23 and 33 mmol· L^-1 , respectively. The seed contributed to the precipitation of Fe3＋ by providing a solid surface for the growth of fresh jarosite as well as eliminating the inhibition effect of low Fe3＋ concentration, while K＋ acted as a jarosite-directing cation which improved the formation of jarosite mainly at 24-48 h when there was a high Fe3＋ concentration. The combined application of already- formed jarosite seed and K＋ not only increased the extent of the precipitation reaction, but also accelerated the initial iron precipitation rate. A significant amount of jarosite formed at 0-24 h in the simultaneous presence of jarosite seed and K＋.

关 键 词： 晶种 钾 黄铁矾 酸性矿山废水 嗜酸性氧化亚铁硫杆菌

领　　域： [环境科学与工程]