Heal K V, Dobbie K E, Bozika E, McHaffie H, Simpson A E, Smith K A
School of Geosciences, University of Edinburgh, Darwin Building, Mayfield Road, Edinburgh EH9 3JU, UK.
Water Sci Technol. 2005;51(9):275-82.
No single end-use has yet been identified that is capable of consuming the projected production of ochre (mainly iron (III) oxides) from mine drainage treatment. However, the high sorption capacity of ochre for phosphorus (up to 26 mg kg(-1)) means that it could be used in constructed wetlands to enhance phosphorus removal. Laboratory batch experiments showed that coarse-grained ochre removes 90% of all phosphorus forms from sewage effluent after 15 minutes of shaking. From a larger-scale experiment, it is estimated that constructed wetlands with an ochre substrate should remove phosphorus from sewage effluent for up to 200-300 years. The suitability of ochre for phosphorus removal is being investigated at the field scale in a wastewater constructed wetland (175 m2 area) in Berwickshire, UK. The hydraulic and treatment performance of the wetland were monitored for 15 months prior to installation at the inlet in November 2003 of a tank containing approximately 1200 kg ochre. Results so far show that improved hydraulic design is required for ochre to increase the mean phosphorus removal efficiency of the system (27 +/- 28%), but potentially toxic metals (Al, Cd, Cr, Cu, Fe, Ni, Pb, Zn) have not been released from the ochre into the wetland outflow.
目前尚未确定有哪种单一的最终用途能够消耗矿井排水处理过程中预计产生的赭石（主要是三氧化二铁）。然而，赭石对磷具有较高的吸附能力（高达26毫克/千克），这意味着它可用于人工湿地以提高磷的去除效果。实验室批量实验表明，粗粒赭石在振荡15分钟后可去除污水中90%的所有磷形态。从一项更大规模的实验估计，以赭石为基质的人工湿地应能从污水中去除磷长达200至300年。目前正在英国贝里克郡一个面积为175平方米的废水人工湿地中进行实地规模的研究，以考察赭石用于除磷的适用性。在2003年11月于进水口安装一个装有约1200千克赭石的水箱之前，对该湿地的水力和处理性能进行了15个月的监测。目前的结果表明，为了提高系统的平均磷去除效率（27±28%），赭石需要改进水力设计，但赭石中潜在的有毒金属（铝、镉、铬、铜、铁、镍、铅、锌）尚未释放到湿地流出物中。
